Controller of active clamp flyback conversion circuit, power module and electronic equipment

Abstract

The application provides a controller of an active clamp flyback conversion circuit, a power module and an electronic device. After the active clamp flyback conversion circuit operates in a suspended working state, the controller controls the discharge of a resonance capacitor of the active clamp flyback conversion circuit, so that the voltage value of the output voltage of the power circuit is higher than the preset voltage value of the low-voltage protection of the controller, thereby avoiding the restart of the controller due to the low-voltage protection, and improving the stability of the power module and the electronic device in which the active clamp flyback conversion circuit is located. Moreover, when the controller controls the discharge of the resonance capacitor, the output voltage ripple of the active clamp flyback conversion circuit is not increased, and noise from the input power is not introduced.

Description

TECHNICAL FIELD

[0001] The present application relates to power supply technology, and in particular to a controller of an active clamp flyback (ACF) and a power module and an electronic device in which the controller is located. BACKGROUND

[0002] The existing electronic device or power module generally includes a direct current conversion circuit and a controller of an asymmetrical half-bridge (AHB), an active clamp flyback (ACF) and the like. The direct current conversion circuit generally includes a half-bridge circuit, a transformer and a rectifier circuit. The primary winding circuit of the transformer receives an input voltage of an input power supply through the half-bridge circuit, and the secondary winding circuit is used to provide an output voltage for power supply for a load. The transformer further includes an auxiliary winding circuit, which is used to supply power for a power supply circuit of the controller. When the power module is started, the power supply circuit of the controller is generally supplied with power by the input voltage of the input power supply. When the power module is running, the auxiliary winding circuit of the transformer supplies power for the power supply circuit of the controller. Therefore, the running state of the direct current conversion circuit will affect the stability of the power supply of the power supply circuit of the controller, and further affect the stability of the power module and the electronic device in which the controller is located. SUMMARY

[0003] The present application provides a controller of an active clamp flyback conversion circuit, a power module and an electronic device, which are used to solve the technical problem that the running state of the active clamp flyback conversion circuit and the like direct current conversion circuit affects the stability of the power supply circuit of the controller, the power module and the electronic device in which the controller is located.

[0004] With the direct-current conversion circuit as an example of the active clamping flyback conversion circuit, the first aspect of the present application provides a controller of an active clamping flyback conversion circuit, which can be used to control the operating state of the active clamping flyback conversion circuit. When the controller controls the active clamping flyback conversion circuit to operate in a continuous working state, the output voltage of the active clamping flyback conversion circuit is a rated output voltage. When the controller determines that the output voltage of the active clamping flyback conversion circuit is higher than a first preset value, the controller controls the active clamping flyback conversion circuit to operate in a suspended working state. Subsequently, after the active clamping flyback conversion circuit operates in the suspended working state, when the controller determines that the output voltage of an auxiliary winding circuit in the active clamping flyback conversion circuit is less than or equal to a second preset value, the controller controls the discharge of a clamping capacitor of the active clamping flyback conversion circuit. Alternatively, after the active clamping flyback conversion circuit operates in the suspended working state, when the controller determines that the output voltage of a power supply circuit in the active clamping flyback conversion circuit is less than or equal to a third preset value, the controller controls the discharge of the clamping capacitor of the active clamping flyback conversion circuit. Therefore, the controller provided in the embodiment can control the discharge of the clamping capacitor of the active clamping flyback conversion circuit after the active clamping flyback conversion circuit operates in the suspended working state, so that the output voltage of the power supply circuit is higher than the preset voltage value of the low-voltage protection of the controller, thereby avoiding the restart of the controller due to the low-voltage protection and improving the stability of the power supply module and the electronic equipment in which the active clamping flyback conversion circuit is located. Moreover, the controller provided in the embodiment will not increase the ripple of the output voltage of the active clamping flyback conversion circuit when controlling the discharge of the clamping capacitor, nor will it introduce noise from the input power supply.

[0005] In an embodiment of the first aspect of the present application, when the controller determines that the output voltage of the active clamping flyback conversion circuit is less than or equal to the rated output voltage, the controller controls the active clamping flyback conversion circuit to switch from the suspended working state to the continuous working state. Therefore, the controller provided in the embodiment can control the active clamping flyback conversion circuit to restore the continuous working state in time after the output voltage of the active clamping flyback conversion circuit returns to normal, thereby further improving the stability of the power supply module and the electronic equipment in which the active clamping flyback conversion circuit is located.

[0006] In an embodiment of the first aspect of the present application, the controller specifically controls the active clamping flyback conversion circuit to operate in the suspended working state by controlling the auxiliary power tube and the main power tube of the half-bridge conversion circuit in the active clamping flyback conversion circuit to be turned off. Therefore, the controller provided in the embodiment can control the active clamping flyback conversion circuit to stop processing the received input voltage and providing the output voltage after the load level of the power supply module in which the controller is located drops, thereby avoiding the damage of the load caused by the excessively high output voltage of the power supply module.

[0007] In one embodiment of the first aspect of this application, the controller controls the auxiliary power transistor in the half-bridge circuit of the active clamp flyback converter to turn on, causing the clamping capacitor in the half-bridge circuit to discharge. This allows the output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit to be increased more quickly, and the output voltage of the power supply module to be reduced more quickly, minimizing the output voltage of the power supply module to the load from exceeding a first preset value, and more effectively protecting the load.

[0008] In one embodiment of the first aspect of this application, the controller controls the auxiliary power transistor in the half-bridge circuit of the active clamp flyback converter circuit to periodically turn on, causing the clamping capacitor in the half-bridge circuit to discharge. Because the clamping capacitor in the half-bridge circuit discharges periodically, the output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit can be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid voltage increases, thereby improving the stability of the power supply module and electronic equipment in which the active clamp flyback converter circuit is located.

[0009] In one embodiment of the first aspect of this application, the controller controls the auxiliary power transistor and the main power transistor in the half-bridge circuit of the active clamp flyback converter to periodically alternately conduct, causing the clamping capacitor in the half-bridge circuit to discharge. Specifically, when the controller controls the auxiliary power transistor to conduct and the main power transistor to be off, the clamping capacitor discharges, and the output voltage of the controller's power supply circuit increases. When the controller controls the auxiliary power transistor to be off and the main power transistor to conduct, the input voltage generates a primary winding voltage across the primary winding. This primary winding voltage is coupled through a transformer to generate an auxiliary winding voltage on the auxiliary winding. Correspondingly, the output voltage of the auxiliary winding circuit increases, and the output voltage of the controller's power supply circuit also increases. The output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit increase in a stepwise manner, avoiding excessively rapid increases that could damage circuit components, thereby improving the stability of the power supply module and electronic equipment containing the active clamp flyback converter circuit.

[0010] In the above embodiments, in scenarios where the load level of the power module drops, the controller can control the clamping capacitor to start discharging. Furthermore, when controlling the discharge of the clamping capacitor, the controller only needs to control the on / off state of the main power transistor and auxiliary power transistor in the active clamp flyback converter circuit, simplifying its configuration and making it more suitable for various products.

[0011] In one embodiment of the first aspect of this application, the controller determines that the voltage of the clamping capacitor has dropped to less than or equal to a preset voltage value, and then controls the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the voltage of the clamping capacitor from being too low and affecting the recovery of the active clamp flyback converter circuit to a continuous working state, further improving the stability of the power supply module and electronic equipment where the active clamp flyback converter circuit is located.

[0012] In one embodiment of the first aspect of this application, the controller determines that the output voltage of the auxiliary winding circuit has increased to a value greater than or equal to a fourth preset value, and then controls the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the output voltage of the auxiliary winding circuit from becoming too high and damaging the power supply circuit and the controller, further improving the stability of the power supply module and electronic equipment where the active clamp flyback converter circuit is located.

[0013] In one embodiment of the first aspect of this application, the controller can determine that if the output voltage of the power supply circuit rises to a value greater than or equal to a fifth preset value, then control the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the output voltage of the power supply circuit from being too high and damaging the controller, further improving the stability of the power supply module and electronic equipment where the active clamp flyback converter circuit is located.

[0014] In one embodiment of the first aspect of this application, the controller controls the auxiliary power transistor and the main power transistor in the half-bridge circuit of the active clamp flyback converter to turn off, thereby stopping the clamping capacitor from discharging. Therefore, in the scenario where the load level of the power module drops, the controller in this embodiment only needs to control the conduction or cutoff of the main power transistor and the auxiliary power transistor in the active clamp flyback converter to stop the clamping capacitor from discharging, making its configuration simple and thus more suitable for use in various products.

[0015] A second aspect of this application provides a power supply module, including an active clamp flyback converter circuit, an auxiliary winding circuit, a power supply circuit, and a controller. The active clamp flyback converter circuit includes a half-bridge circuit, a transformer, and a rectifier circuit. The half-bridge circuit includes a main power transistor, an auxiliary power transistor, and a clamping capacitor.

[0016] The active clamp flyback converter circuit receives the input voltage, performs voltage transformation on the input voltage, and provides the output voltage to the load. An auxiliary winding circuit supplies power to the power supply circuit. The power supply circuit supplies power to the controller. The controller can be used to control the active clamp flyback converter circuit.

[0017] When the controller operates the active clamp flyback converter circuit in continuous operation, the output voltage of the active clamp flyback converter circuit is the rated output voltage. When the controller determines that the output voltage of the symmetrical half-bridge converter circuit is higher than a first preset value, it controls the active clamp flyback converter circuit to operate in a suspended state. Subsequently, after the active clamp flyback converter circuit operates in the suspended state, when the controller determines that the output voltage of the auxiliary winding circuit in the active clamp flyback converter circuit is less than or equal to a second preset value, it controls the clamping capacitor of the active clamp flyback converter circuit to discharge. Alternatively, after the active clamp flyback converter circuit operates in the suspended state, when the controller determines that the output voltage of the power supply circuit in the active clamp flyback converter circuit is less than or equal to a third preset value, it controls the clamping capacitor of the active clamp flyback converter circuit to discharge.

[0018] Therefore, in the power module provided in this embodiment, the controller can, after the active clamp flyback converter circuit is in a suspended operating state, control the discharge of the clamping capacitor of the active clamp flyback converter circuit to make the output voltage of the power circuit higher than the preset voltage value of the controller's low voltage protection. This avoids the controller restarting due to low voltage protection and improves the stability of the power module and the electronic equipment it is located in. Furthermore, the controller provided in this embodiment does not increase the ripple of the output voltage of the active clamp flyback converter circuit when controlling the discharge of the clamping capacitor, nor does it introduce noise from the input power supply.

[0019] In one embodiment of the second aspect of this application, when the controller determines that the output voltage of the active clamp flyback converter circuit is less than or equal to the rated output voltage, the controller controls the active clamp flyback converter circuit to switch from a suspended operating state to a continuous operating state. Therefore, in the power supply module provided in this embodiment, the controller can promptly control the active clamp flyback converter circuit to resume continuous operating state after the output voltage of the active clamp flyback converter circuit returns to normal, further improving the stability of the power supply module and the electronic equipment in which it is located.

[0020] In one embodiment of the second aspect of this application, the controller specifically controls the active clamp flyback converter circuit to operate in a suspended state by turning off both the auxiliary power transistor and the main power transistor of the half-bridge converter circuit in the active clamp flyback converter circuit. Therefore, in the power module provided in this embodiment, the controller can control the active clamp flyback converter circuit to stop processing the received input voltage and providing an output voltage after the load level of the power module drops, thus preventing the output voltage of the power module from being too high and damaging the load.

[0021] In one embodiment of the second aspect of this application, the controller controls the auxiliary power transistor in the half-bridge circuit of the active clamp flyback converter to turn on, causing the clamping capacitor in the half-bridge circuit to discharge. This allows the output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit to be increased more quickly, and the output voltage of the power supply module to be reduced more quickly, minimizing the output voltage of the power supply module to the load from exceeding a first preset value, and more effectively protecting the load.

[0022] In one embodiment of the second aspect of this application, the controller controls the auxiliary power transistor in the half-bridge circuit of the active clamp flyback converter circuit to periodically turn on, causing the clamping capacitor in the half-bridge circuit to discharge. Because the clamping capacitor in the half-bridge circuit discharges periodically, the output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit can be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid voltage increases, thereby improving the stability of the power supply module and the electronic equipment in which it is located.

[0023] In one embodiment of the second aspect of this application, the controller controls the auxiliary power transistor and the main power transistor in the half-bridge circuit of the active clamp flyback converter to periodically alternately conduct, causing the clamping capacitor in the half-bridge circuit to discharge. Specifically, when the controller controls the auxiliary power transistor to conduct and the main power transistor to be off, the clamping capacitor discharges, and the output voltage of the controller's power supply circuit increases. When the controller controls the auxiliary power transistor to be off and the main power transistor to conduct, the input voltage generates a primary winding voltage across the primary winding. This primary winding voltage is coupled through a transformer to generate an auxiliary winding voltage on the auxiliary winding. Correspondingly, the output voltage of the auxiliary winding circuit increases, and the output voltage of the controller's power supply circuit also increases. The output voltage of the auxiliary winding circuit and the output voltage of the power supply circuit increase in a stepwise manner, avoiding excessively rapid increases that could damage circuit components, thereby improving the stability of the power supply module and the electronic equipment it is located in.

[0024] In the above embodiments, in scenarios where the load level of the power module drops, the controller in the power module can control the clamping capacitor to start discharging. Furthermore, when controlling the discharge of the clamping capacitor, the controller only needs to control the on / off state of the main power transistor and auxiliary power transistor in the active clamp flyback converter circuit, simplifying its configuration and making it more suitable for various products.

[0025] In one embodiment of the second aspect of this application, the controller determines that the voltage of the clamping capacitor has dropped to less than or equal to a preset voltage value, and then controls the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the voltage of the clamping capacitor from being too low and affecting the active clamp flyback converter circuit to resume continuous operation, further improving the stability of the power supply module and the electronic equipment it is located in.

[0026] In one embodiment of the second aspect of this application, the controller determines that if the output voltage of the auxiliary winding circuit rises to a value greater than or equal to a fourth preset value, it controls the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the power supply circuit and controller from being damaged by excessively high output voltage of the auxiliary winding circuit, further improving the stability of the power supply module and the electronic equipment in which it is located.

[0027] In one embodiment of the second aspect of this application, the controller can determine that if the output voltage of the power supply circuit rises to a value greater than or equal to a fifth preset value, then control the clamping capacitor to stop discharging. Therefore, the controller in this embodiment can prevent the output voltage of the power supply circuit from becoming too high and damaging the controller, further improving the stability of the power supply module and the electronic equipment it is located in.

[0028] In one embodiment of the second aspect of this application, the controller controls the auxiliary power transistor and the main power transistor in the half-bridge circuit of the active clamp flyback converter circuit to turn off, thereby stopping the clamping capacitor from discharging. Therefore, in this embodiment, when the load level of the power module drops, the controller of the power module only needs to control the conduction or cutoff of the main power transistor and the auxiliary power transistor in the active clamp flyback converter circuit to stop the clamping capacitor from discharging, making its configuration simple and more suitable for use in various products.

[0029] It should be noted that in the above embodiments, the DC-DC converter circuit is taken as an example of an active clamp flyback converter circuit. The DC-DC converter circuit can also be an asymmetric half-bridge converter circuit, etc.

[0030] A third aspect of this application provides an electronic device including a controller for an active clamp flyback converter circuit as described in any of the first aspects of this application.

[0031] A fourth aspect of this application provides an electronic device including a power module as described in any of the second aspects of this application. Attached Figure Description

[0032] Figure 1 A schematic diagram of an electronic device provided in this application;

[0033] Figure 2 Another schematic diagram of an electronic device provided in this application;

[0034] Figure 3 A schematic diagram of a power module provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of a power supply module;

[0036] Figure 5 for Figure 4 A schematic diagram of the voltage waveform of the power supply module in a scenario where the load level drops.

[0037] Figure 6 A schematic diagram of another existing controller and its associated power module;

[0038] Figure 7 A schematic diagram of a power module provided in an embodiment of this application;

[0039] Figure 8 A schematic diagram of the voltage waveform of the controller and its power module provided in this application in a scenario where the load level drops.

[0040] Figure 9 A schematic diagram of one embodiment of the power module provided in this application;

[0041] Figure 10 A schematic diagram of one embodiment of the power module provided in this application;

[0042] Figure 11 A schematic diagram of the voltage waveform of the controller and its power module provided in this application in a scenario where the load level drops.

[0043] Figure 12 A schematic diagram of one embodiment of the power module provided in this application;

[0044] Figure 13 A schematic diagram of the control signals of the controller provided in this application in a scenario where the load level of the power module drops;

[0045] Figure 14 A schematic diagram of the control signals of the controller provided in an embodiment of this application;

[0046] Figure 15 A schematic diagram of an embodiment of the controller provided in this application controlling the discharge of the resonant capacitor in the AHB converter circuit;

[0047] Figure 16 A schematic diagram showing the change in the capacitor voltage of the resonant capacitor in the AHB converter circuit provided in this application;

[0048] Figure 17 A schematic diagram of another embodiment of the controller provided in this application controlling the discharge of the resonant capacitor of the AHB converter circuit;

[0049] Figure 18 A schematic diagram of a half-bridge circuit in another AHB converter circuit provided in this application;

[0050] Figure 19 A schematic diagram of a half-bridge circuit in another AHB converter circuit provided in this application;

[0051] Figure 20A schematic diagram of one embodiment of the power module provided in this application;

[0052] Figure 21 A schematic diagram of one embodiment of the power module provided in this application;

[0053] Figure 22 A schematic diagram of the voltage waveform of the controller and its power module provided in this application in a scenario where the load level drops.

[0054] Figure 23 A schematic diagram of one embodiment of the power module provided in this application;

[0055] Figure 24 A schematic diagram of the control signals of the controller provided in this application in a scenario where the load level of the power module drops;

[0056] Figure 25 A schematic diagram of the control signals of the controller provided in an embodiment of this application;

[0057] Figure 26 A schematic diagram of an embodiment of the controller provided in this application controlling the discharge of the clamping capacitor in the ACF conversion circuit;

[0058] Figure 27 A schematic diagram showing the change in the capacitor voltage of the clamping capacitor in the ACF converter circuit provided in this application;

[0059] Figure 28 This is a schematic diagram of another embodiment of the controller provided in this application controlling the discharge of the clamping capacitor in the ACF conversion circuit. Detailed Implementation

[0060] Figure 1 This is a schematic diagram of an electronic device provided in this application. (For example...) Figure 1As shown, the electronic device 10 includes a power module 11 and a load 12. The power module 11 receives an input voltage V1 from an input power source 13 and provides an output voltage V2 to power the load 12. In one embodiment, the electronic device 10 may include multiple power modules 11, each providing multiple output voltages V2 to power the load 12. In another embodiment, the electronic device 10 may include multiple loads 12, with each power module 11 providing multiple output voltages V2 to power the multiple loads 12 respectively. In yet another embodiment, the electronic device 10 may include multiple loads 12 and multiple power modules 11, with each power module 11 providing power to the multiple loads 12 respectively. In one embodiment, the electronic device 10 may receive the output voltage V1 from multiple input power sources 13. In one embodiment, the electronic device 10 may include one or more input power sources 13. In one embodiment, the electronic device 10 may be an electronic device such as a mobile phone, computer, tablet, or home appliance. In one embodiment, the load 12 includes the internal circuitry of the electronic device 10 or an external electronic device connected to the electronic device 10.

[0061] Figure 2 Another schematic diagram of an electronic device provided in this application. (See diagram below.) Figure 2 As shown, the electronic device 10 includes a power module 11. The power module 11 receives an input voltage V1 provided by an input power source 13 and provides an output voltage V2 to power a load 12. In one embodiment, the electronic device 10 includes multiple power modules 11, which can provide multiple output voltages V2 to power the load 12. In one embodiment, the power modules 11 in the electronic device 10 can provide multiple output voltages V2 to power multiple loads 12 respectively. In one embodiment, the electronic device 10 may include multiple power modules 11, which provide output voltages V2 to multiple loads 12 respectively. In one embodiment, the electronic device 10 can receive multiple input power sources 13. In one embodiment, the electronic device 10 may include input power sources 13. In one embodiment, the electronic device 10 may be an adapter, charging station, or other similar device. Typically, an adapter can also be called a charger, charging head, switch power supply, or power converter. In one embodiment, the load 12 may be an electronic device such as a mobile phone, computer, tablet, or home appliance. In one embodiment, load 12 may be other internal circuitry of electronic device 10.

[0062] Figure 3 This is a schematic diagram of a power module provided in an embodiment of this application. Figure 3As shown, the power module 11 includes a direct current (DC) converter circuit 111, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The DC converter circuit 111 receives the input voltage V1 provided by the input power supply 13 and provides the output voltage V2 to the load 12. Additionally, the DC converter circuit 111 supplies power to the power supply circuit 113 of the controller 114 via the auxiliary winding circuit 112. The auxiliary winding circuit 112 is coupled to the DC converter circuit 111, generating an auxiliary winding voltage V3 on the auxiliary winding. The auxiliary winding circuit 112 converts the auxiliary winding voltage V3 into an output voltage V4 and provides the output voltage V4 to the power supply circuit 113. The power supply circuit 113 converts the output voltage V4 of the auxiliary winding circuit 112 into an output voltage V5 and provides the output voltage V5 to the control circuit 114. The controller 114 controls the DC converter circuit 111. In this embodiment of the application, the DC-DC converter circuit 111 may include an asymmetrical half-bridge (AHB) converter circuit or an active clamp flyback (ACF) converter circuit.

[0063] Figure 4 This is a schematic diagram of a power supply module. Figure 4 As shown, the power module 11 includes a DC-DC converter circuit 111, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The DC-DC converter circuit 111 may include a half-bridge circuit 1110, a transformer 1112, and a rectifier circuit 1114. The transformer 1112 includes a primary winding 1111 and a secondary winding 1113. Additionally, the transformer 1112 also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113 is coupled to the primary winding 1111, and the auxiliary winding 1121 is coupled to the primary winding 1111.

[0064] The half-bridge circuit 1110 receives the input voltage V1 provided by the input power supply 13 and provides the output voltage V according to the control signal of the controller 114. 10 Input voltage V1 and output voltage V 10 It can be a voltage range. The half-bridge circuit 1110 typically includes a main power transistor, an auxiliary power transistor, and a capacitor. Based on the connection relationships of the main power transistor, auxiliary power transistor, and capacitor, the DC-DC converter circuit 111 includes an AHB converter circuit and an ACF converter circuit. The capacitor in the half-bridge circuit 1110 of the AHB converter circuit is a resonant capacitor C. r The capacitor C in the half-bridge circuit 1110 of the ACF converter is a clamping capacitor. c .

[0065] The primary winding 1111 of transformer 1112 is used to receive the output voltage V of half-bridge circuit 1110.10 And generate a primary winding voltage V on the primary winding 1111. 11 The secondary winding 1113 of transformer 1112 is coupled to the primary winding 1111 of transformer 1112, and a secondary winding voltage V is generated on the secondary winding 1113. 12 Winding voltage V 11 and secondary winding voltage V 12 It can be a voltage range.

[0066] The rectifier circuit 1114 is used to receive the secondary winding voltage V generated on the secondary winding 1113. 12 This is then converted into an output voltage V2. The output voltage V2 can be a voltage range.

[0067] The auxiliary winding circuit 112 supplies power to the power supply circuit 113. The auxiliary winding 1121 of the auxiliary winding circuit 112 is coupled to the primary winding 1111 of the transformer 1112. The primary winding voltage V on the primary winding 1112 is... 11 After coupling, an auxiliary winding voltage V3 is generated on the auxiliary winding 1121. The auxiliary winding voltage V3, after being processed by the auxiliary winding circuit 112, provides an output voltage V4 to the power supply circuit 113. The auxiliary winding circuit 112 may include the auxiliary winding 1121 and a rectifier module 1122. The auxiliary winding voltage V3 and the output voltage V4 can be within a voltage range.

[0068] Power supply circuit 113 supplies power to controller 114. Power supply circuit 113 receives the output voltage V4 from auxiliary winding circuit 112 and provides output voltage V5 to controller 114. Power supply circuit 113 may include a voltage regulator circuit. Output voltage V5 may be a voltage range.

[0069] Controller 114 is used to control the operating state of DC-DC converter 111. Controller 114 can send control signals G to the half-bridge circuit 1110 of DC-DC converter 111, thereby controlling the operating state of DC-DC converter 111. The operating states of DC-DC converter 111 typically include continuous operation and paused operation. Continuous operation can also be called normal operation, normal controller waveform generation, etc. Pause operation can also be called intermittent operation, BURST operation, intermittent controller waveform generation, etc.

[0070] When the load level of the load 12 of the power module 11 drops, due to the voltage V of the primary winding 1111 in the DC-DC converter circuit 111... 11If no change occurs, the output voltage V2 of the DC-DC converter circuit 111 will increase rapidly. Accordingly, the controller 114 needs to adjust the operating state of the DC-DC converter circuit 111 to reduce the output voltage V2 of the DC-DC converter circuit 111, so as to prevent the output voltage V2 of the power supply module 11 from being too high and damaging the load 12.

[0071] Figure 5 for Figure 4 The diagram below illustrates the voltage waveform of the power module under load level drops. (The following text is combined with...) Figure 4 The power module 11 shown in the diagram illustrates the impact of a drop in the load level L of the load 12 on the existing controller 114 and the power module 11 in which it is located.

[0072] Before time t1, the load level L of load 12 is the normal load L1. Controller 114 controls the DC-DC converter circuit 111 to operate continuously, and the output voltage V2 of the DC-DC converter circuit 111 is equal to the rated output voltage V. 20 Rated output voltage V 20 This is the rated output voltage of the DC-DC converter circuit 111 during continuous operation. Rated output voltage V 20 It can be a voltage range. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 has a voltage value of V. 40 Voltage value V 40 This is the rated input voltage for the auxiliary winding circuit 112. Voltage value V 40 It can be the output voltage V5 of a power supply circuit 113 with a voltage range, the voltage value of which is V. 50 Voltage value V 50 This is the rated input voltage of controller 114. Voltage value V 50 It can be a voltage range.

[0073] At time t1, the load level L of load 12 drops from normal load L1 to light load L2.

[0074] After time t1, the output voltage V2 of the DC-DC converter circuit 111 will increase to a value greater than the rated output voltage V. 20 In one embodiment, controller 114 controls the DC-DC converter circuit 111 to operate in a continuous operating state. Furthermore, controller 114 reduces the conduction frequency or conduction duration of the main power transistor and auxiliary power transistor in the half-bridge circuit 1111, thereby reducing the primary winding voltage V of the primary winding 1111. 11 The voltage value decreases. Correspondingly, the secondary winding voltage V... 13The decrease in voltage value can reduce the output voltage V2 of DC-DC converter circuit 111. Since the auxiliary winding 1121 in auxiliary winding circuit 112 is coupled to the primary winding 1111, the auxiliary winding voltage V3 decreases. Correspondingly, the output voltage V4 of auxiliary winding circuit 112 decreases, and the output voltage V5 of power supply circuit 113 decreases.

[0075] However, the load level drop of load 12 has a significant impact. Controller 114, by simply reducing the conduction frequency or conduction duration of the main power transistor and auxiliary power transistor in the half-bridge circuit 1111, is usually unable to effectively reduce the output voltage V2 of the DC-DC converter circuit 111. This results in the output voltage V2 of the DC-DC converter circuit 111 continuing to increase after time t1.

[0076] At time t2, after time t1, the output voltage V2 of the DC-DC converter circuit 111 increases to a value greater than or equal to the first preset value V. 21 An excessively high output voltage V2 of the DC-DC converter 111 will damage the load 12. To prevent the output voltage V2 of the DC-DC converter 111 from continuing to rise, the controller 114 needs to control the DC-DC converter 111 to operate in a suspended state. Specifically, the voltage value V... 21 Recorded as the first preset value, voltage value V 21 This is the maximum output voltage of the DC-DC converter circuit 111. Voltage value V 21 The output voltage V is less than the rated output voltage of the DC-DC converter circuit 111. 20 And it is less than the overvoltage protection voltage of DC-DC converter circuit 111.

[0077] After time t2, the DC-DC converter 111 is in a suspended state, causing the primary winding voltage V of the primary winding circuit 1111 in the DC-DC converter 111 to be suspended. 11 The voltage decreases. Correspondingly, the output voltage V2 of the DC-DC converter circuit 111 decreases. Because the auxiliary winding 1121 is coupled to the primary winding 1111, the primary winding voltage V of the primary winding 1111 decreases. 11 A decrease in voltage will cause a decrease in the auxiliary winding voltage V3 of the auxiliary winding 1121. Accordingly, the output voltage V4 of the auxiliary winding circuit 112 decreases, and the output voltage V5 of the power supply circuit 113 decreases.

[0078] If the output voltage V5 of power supply circuit 113 is less than the undervoltage protection voltage V of controller 114 51 Controller 114 will restart due to low voltage protection. Voltage value V 51This is the undervoltage protection voltage for controller 114. Controller 114 needs a period of time to complete the restart process, which means that during this period, controller 14 cannot control the operating status of DC transformer circuit 111, thereby affecting the stability of power module 11 and electronic equipment 10 where controller 114 is located.

[0079] At time t3, after time t2, the output voltage V5 of power supply circuit 113 drops to less than or equal to the third preset value V. 52 The third preset value V 52 The undervoltage protection voltage V of controller 114 is greater than 51 And less than the rated input voltage V of controller 114 50 When the output voltage V5 of the power supply circuit 113 is less than or equal to the third preset value V... 52 The controller 114 controls the DC-DC converter circuit 111 to operate in a continuous operating state. Correspondingly, the primary winding voltage V... 11 The voltage value increases. Primary winding voltage V 11 An increase in the voltage value of the auxiliary winding can lead to an increase in the voltage value of the auxiliary winding voltage V3. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 increases. The output voltage V5 of the power supply circuit 113 also increases. However, the primary winding voltage V... 11 An increase in voltage will also lead to an increase in the secondary winding voltage V. 12 The voltage value is increased, thereby increasing the output voltage V2 of the DC-DC converter circuit 111.

[0080] At time t4, after time t3, the output voltage V2 of the DC-DC converter circuit 111 increases to a value greater than or equal to the second predetermined value V. 21 At this time, controller 114 needs to control DC-DC converter 111 to operate in a suspended state. Operating DC-DC converter 111 in a suspended state allows the primary winding voltage V to remain constant. 11 The voltage value decreases. Correspondingly, the output voltage V2 of the DC-DC converter circuit 111 decreases. However, the primary winding voltage V... 11 The decrease in voltage will also cause a decrease in the output voltage V4 of the auxiliary winding circuit 112. Correspondingly, the output voltage V5 of the power supply circuit 113 will decrease.

[0081] At time t5, after time t4, the output voltage V5 of power supply circuit 113 drops to less than or equal to a fifth predetermined value V. 52At this time, the controller 114 needs to control the DC-DC converter circuit 111 to operate in a continuous working state. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 increases. The output voltage V5 of the power supply circuit 113 also increases. However, the continuous working state of the DC-DC converter circuit 111 will also cause the output voltage V2 of the DC-DC converter circuit 111 to increase.

[0082] Therefore, although the controller 114 in the existing power module 11 can avoid restarting due to undervoltage protection, it also causes a large ripple in the output voltage V2 of the DC-DC converter circuit 111. Thus, the existing controller 114 and the power module 11 in which it is located cause a large ripple in the output voltage V2 of the DC-DC converter circuit 111, thereby affecting the stability of the power module 11.

[0083] Figure 6 This is a schematic diagram of another existing controller and its associated power module. Figure 6 As shown, the auxiliary winding circuit 112 in the power module 11 is connected to the input power supply 13 via switch K. When the load level L of the load 12 changes, causing an increase in the output voltage V2 of the DC-DC converter circuit 111, the controller 114 controls the DC-DC converter circuit 111 to operate in a suspended state, and the controller 114 controls switch K to turn on. The input power supply 13 supplies power to the power circuit 113 through switch K and the auxiliary winding circuit 112, thus preventing the controller 114 from restarting due to undervoltage protection. However, noise from the input power supply 13 can also be transmitted to the inside of the power module 11 through switch K, affecting the electromagnetic compatibility (EMC) of the power module 11.

[0084] This application provides a controller for a DC-DC converter circuit and its associated power supply module and electronic equipment, which can solve the problems of stability, electromagnetic compatibility, and increased output voltage ripple in existing controllers and their associated power supply modules and electronic equipment. Specific embodiments are described in detail below. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0085] Figure 7 This is a schematic diagram of a power module provided in an embodiment of this application. Figure 7 The power module 11 shown can be applied in, for example... Figure 1 or Figure 2 In the electronic device 10 shown. For example... Figure 7As shown, the power module 11 includes a DC-DC converter circuit 111, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The DC-DC converter circuit 111 may include a half-bridge circuit 1110, a transformer 1112, and a rectifier circuit 1114. The transformer 1112 includes a primary winding 1111 and a secondary winding 1113. Additionally, the transformer 1112 also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113 is coupled to the primary winding 1111, and the auxiliary winding 1121 is coupled to the primary winding 1111.

[0086] The half-bridge circuit 1110 receives the input voltage V1 provided by the input power supply 13 and provides the output voltage V to the primary winding 1111 according to the control signal of the controller 114. 10 The half-bridge circuit 1110 typically includes a main power transistor, an auxiliary power transistor, and a capacitor. Based on the connection relationship between the main power transistor, the auxiliary power transistor, and the capacitor, the DC-DC converter circuit 111 in this embodiment includes an AHB converter circuit and an ACF converter circuit. In one embodiment, the DC-DC converter circuit 111 includes an AHB converter circuit, and the capacitor in the half-bridge circuit 1110 is a resonant capacitor C. r In one embodiment, the DC-DC converter circuit 111 includes an ACF converter circuit, and the capacitor in the half-bridge circuit 1110 is a clamping capacitor C. c In one embodiment, the main power transistor and the auxiliary power transistor are metal-oxide-semiconductor field-effect transistors (MOS). In other embodiments, the main power transistor and the auxiliary power transistor can also be other types of transistors such as bipolar transistors or insulated-gate bipolar transistors (IGBTs).

[0087] The primary winding 1111 of transformer 1112 is used to receive the output voltage V of half-bridge circuit 1110. 10 And generate primary winding voltage V 11 The secondary winding 1113 of transformer 1112 is coupled to the primary winding 1111 of transformer 1112, and a secondary winding voltage V3 is generated on the secondary winding 1113.

[0088] The rectifier circuit 1114 is used to receive the secondary winding voltage V3 on the secondary winding 1113 and convert it into the output voltage V2.

[0089] The auxiliary winding circuit 112 supplies power to the power supply circuit 113. The auxiliary winding 1121 of the auxiliary winding circuit 112 is coupled to the primary winding 1111 of the transformer 1112. The primary winding voltage V on the primary winding 1112 is... 11After coupling, an auxiliary winding voltage V3 is generated on the auxiliary winding 1121. The auxiliary winding voltage V3 is processed by the auxiliary winding circuit 112 and then supplies an output voltage V4 to the power supply circuit 113. In one embodiment, the auxiliary winding circuit 112 includes the auxiliary winding 1121 and a rectifier module 1122.

[0090] Power supply circuit 113 supplies power to controller 114. Power supply circuit 113 receives the output voltage V4 from auxiliary winding circuit 112 and provides output voltage V5 to controller 114. That is, DC-DC converter 111 supplies power to power supply circuit 113 of controller 114 via auxiliary winding circuit 112 coupled to the primary winding 1111 of its transformer 1112. In some embodiments, power supply circuit 113 includes a voltage regulator circuit.

[0091] The controller 114 is used to control the operating status of the DC-DC converter circuit 111. The controller 114 is also used to detect the output voltage V2 of the DC-DC converter circuit 111, the output voltage V4 of the winding circuit 112, the output voltage V5 of the power supply circuit 113, or the capacitor voltage V in the half-bridge circuit 1110. c The controller 114 is also used to control the operating state of the DC-DC converter circuit 111 based on the changes in one or more of the aforementioned voltage values.

[0092] In one embodiment, the controller 114 controls the operating state of the DC-DC converter 111 by controlling the operating state of the half-bridge circuit 1110 in the DC-DC converter 111. For example, the controller 114 can control the on and off states of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110, thereby controlling the operating state of the half-bridge circuit 1110. The controller 114 can adjust the on-frequency or on-time of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110, and correspondingly adjust the output voltage V of the half-bridge circuit 1110. 10 Correspondingly, the output voltage V of the half-bridge circuit 1110... 10 Changes in the primary winding voltage V will cause changes in the primary winding voltage V. 11 Change. Correspondingly, the primary winding voltage V... 11 Changes can lead to changes in the secondary winding voltage V 12 And the auxiliary winding voltage V3 changes. Correspondingly, the secondary winding voltage V 12 The change in voltage V3 can cause a change in the output voltage V2 of the DC-DC converter circuit 111. Correspondingly, a change in the auxiliary winding voltage V3 can cause a change in the output voltage V4 of the auxiliary winding circuit 112. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 can cause a change in the output voltage V5 of the power supply circuit 113.

[0093] like Figure 7As shown in direction F1, the DC-DC converter 111 can provide an output voltage V2 to power the load 12. The input voltage V1 is converted into the output voltage V2 through the half-bridge circuit 1110, the primary winding 1111, the secondary winding 1113, and the rectifier circuit 1114 of the DC-DC converter 111.

[0094] like Figure 7 As shown in direction F2, the DC-DC converter circuit 111 can supply power to the power supply circuit 113 of the controller 114 through the auxiliary winding circuit 112. Specifically, the input voltage V1, after being processed by the half-bridge circuit 1110 of the DC-DC converter circuit 111, can generate a primary winding voltage V0 in the primary winding 1111. 11 Correspondingly, the primary winding voltage V 11 An auxiliary winding voltage V3 can be generated on the auxiliary winding 1121 of the transformer 1112. After being processed by the auxiliary winding circuit 1121, the auxiliary winding voltage V3 provides an output voltage V4 to power the power supply circuit 113 of the controller 114.

[0095] Figure 8 A schematic diagram of the voltage waveform of the controller and its power module provided in this application under a scenario where the load level drops. The following section combines... Figure 7 and Figure 8 This describes the operation of the controller 114 and its power module 11 provided in this application in a scenario where the load level L of the load 12 drops.

[0096] Before time t1, the load level L of load 12 is the normal load L1. Controller 114 controls the DC-DC converter 111 to operate in continuous operation, and controller 114 controls the output voltage V2 of the DC-DC converter 111 to be the rated output voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 has a value of V. 40 The output voltage V5 of power supply circuit 113 has a voltage value of V. 50 In the half-bridge circuit 1111, the capacitor voltage V is... c The voltage value is V C1 V C1 This refers to the capacitor voltage when the DC-DC converter circuit 111 is operating in continuous operation.

[0097] At time t1, the load level L of load 12 drops from the normal load L1 to the light load L2. Accordingly, after time t1, the output voltage V2 of the DC-DC converter circuit 111 will increase to a value greater than the rated output voltage V. 20 .

[0098] In one embodiment, when the output voltage V2 of the DC-DC converter circuit 111 is greater than the rated output voltage V...20 The controller 114 can control the DC-DC converter circuit 111 to operate in a continuous working state. Furthermore, the controller 114 controls the DC-DC converter circuit 111 to reduce the output voltage V2. That is, the controller 114 adjusts the output voltage V2 of the DC-DC converter circuit 111 based on the voltage difference between the output voltage V2 and the rated output voltage V. 20 Based on the comparison results, controller 114 controls the DC-DC converter circuit 111 to operate in a continuous working state, and controller 114 controls the DC-DC converter circuit 111 to reduce the output voltage V2. Specifically, controller 114 sends a control signal G to control the operating state of the main power transistor and auxiliary power transistor in the half-bridge circuit 1110, so that the primary winding voltage V2 is reduced. 11 The voltage value decreases. In one embodiment, the controller 114 can reduce the transmission frequency of the control signal G, thereby reducing the conduction frequency of the main power transistor and the auxiliary power transistor. In one embodiment, the controller 114 can reduce the duty cycle of the control signal G, thereby reducing the conduction time of the main power transistor and the auxiliary power transistor. In another embodiment, when the output voltage V2 of the DC-DC converter circuit 111 is greater than the rated output voltage V... 20 The controller 114 can control the DC-DC converter 111 to operate in a suspended state, and can also reduce the output voltage V2. However, both of the above embodiments may not be able to effectively reduce the output voltage V2 of the DC-DC converter 111, and the output voltage V2 of the DC-DC converter 111 will continue to increase after time t1.

[0099] Meanwhile, after time t1, the drop in load level L causes the output voltage V2 of the DC-DC converter circuit 111 to be higher than the rated output voltage V. 20 Primary winding voltage V 11 When the capacitor in half-bridge circuit 1110 is charged, the capacitor voltage V in half-bridge circuit 1110... c The voltage value from V C1 Upgrade to V C2 V C2 This is the maximum charging voltage of the capacitor in the half-bridge circuit 1110.

[0100] At time t2, after time t1, the output voltage V2 of the DC-DC converter circuit 111 increases to the first preset value V. 21 The controller 114 determines that the output voltage V2 of the DC-DC converter circuit 111 is greater than or equal to a first preset value V. 21 The controller 114 controls the DC-DC converter circuit 111 to stop operating. That is, the controller 114 determines the voltage value of the output voltage V2 of the DC-DC converter circuit 111 based on the first preset value V. 21Based on the comparison results, controller 114 controls the DC-DC converter circuit 111 to operate in a suspended state. Specifically, controller 114 controls both the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110 to be turned off. In this embodiment, the first preset value V 21 This can be the peak voltage of the DC-DC converter 111. The peak voltage of the DC-DC converter 111 is greater than the rated output voltage V. 20 And it is less than the overvoltage protection voltage of DC-DC converter circuit 111.

[0101] After time t2, controller 114 controls the DC-DC converter 111 to operate in a suspended state. Correspondingly, the output voltage V of the half-bridge circuit 1110... 10 The voltage value decreases, causing the primary winding voltage V on the primary winding 1111 to... 11 The voltage value decreases. The primary winding voltage V on the primary winding 1111 decreases. 11 A drop in voltage will cause the secondary winding voltage V on the secondary winding 1113 to decrease. 12 The voltage decreases. Correspondingly, the output voltage V2 of the DC-DC converter circuit 111 decreases. Additionally, the primary winding voltage V on the primary winding 1111 decreases. 11 A decrease in the voltage value of the auxiliary winding will cause a decrease in the voltage value of the auxiliary winding voltage V3. Accordingly, the output voltage value of the auxiliary winding circuit 112 V4 decreases, and the output voltage value of the power supply circuit 113 V5 decreases.

[0102] At time t3, after time t2, the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to the second preset value V. 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 Among them, the voltage value V 41 Recorded as the second preset value, voltage value V 41 The voltage is greater than the minimum input voltage of the power supply circuit 113 and less than the rated input voltage V of the power supply circuit 113. 40 The voltage value V 52 Recorded as the third preset value, voltage value V 52 The undervoltage protection voltage V of controller 114 is greater than 51 And less than the rated input voltage V of controller 114 50

[0103] In one embodiment, controller 114 determines that the output voltage V4 of auxiliary winding circuit 112 is less than or equal to a second preset value V. 41 The controller 114 controls the capacitor in the half-bridge circuit 1110 to discharge. That is, the controller 114 discharges the capacitor based on the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the second preset value V.41 The comparison results are used to control the discharge of the capacitor in the half-bridge circuit 1110.

[0104] In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is less than or equal to a third preset value V. 52 The controller 114 controls the capacitor in the half-bridge circuit 1110 to discharge. That is, the controller 114 discharges the capacitor based on the output voltage V5 of the power supply circuit 113 and a third preset value V. 52 Based on the comparison results, controller 114 controls the capacitor in half-bridge circuit 1110 to discharge.

[0105] In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110 to turn on, causing the capacitor in half-bridge circuit 1110 to discharge. When the auxiliary power transistor in half-bridge circuit 1110 is on, the primary winding 1111, the capacitor in half-bridge circuit 1110, and the auxiliary power transistor can form a discharge circuit. Accordingly, the capacitor in half-bridge circuit 1110 discharges, generating a primary winding voltage V on the primary winding 1111. 11 .

[0106] In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110 to periodically turn on, causing the capacitor in half-bridge circuit 1110 to discharge. When the auxiliary power transistor in half-bridge circuit 1110 is turned on, the primary winding 1111, the capacitor in half-bridge circuit 1110, and the auxiliary power transistor in half-bridge circuit 1110 can form a discharge circuit. Accordingly, the periodic turning on of the auxiliary power transistor can cause the capacitor in half-bridge circuit 1110 to discharge periodically.

[0107] In one embodiment, the DC-DC converter 111 includes an AHB converter circuit, and the controller 114 controls the discharge of the resonant capacitor in the half-bridge circuit 1110 of the AHB converter circuit. In one embodiment, the DC-DC converter 111 includes an ACF converter circuit, and the controller 114 controls the discharge of the clamping capacitor in the half-bridge circuit 1110 of the ACF converter circuit. In one embodiment, the half-bridge circuit 1110 of the DC-DC converter 111 may include multiple capacitors, and the controller 114 controls the discharge of the multiple capacitors in the half-bridge circuit 1110.

[0108] After time t3, the capacitor voltage V in the half-bridge circuit 1110 is... c The voltage value decreases. The capacitor in the half-bridge circuit 1110 discharges, causing the primary winding voltage V on the primary winding 1111 to drop. 11 The voltage value increases. Correspondingly, the primary winding voltage V... 11An increase in the voltage value of the auxiliary winding will cause an increase in the voltage value of the auxiliary winding voltage V3. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases. Therefore, in scenarios where the load level of the load 12 changes, the output voltage V5 of the power supply circuit 113 will not drop below the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection.

[0109] The controller 114 provided in this application embodiment controls the discharge of the capacitor in the primary winding circuit 1111 of the DC-DC converter circuit 111, so that the output voltage V5 of the power supply circuit 113 is higher than the preset voltage value V of the low voltage protection of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection. Therefore, the controller 114 provided in this embodiment can improve the stability of the power module 11 and electronic device 10 in which it resides.

[0110] Because the energy stored in the capacitor in the half-bridge circuit 1110 is limited, the primary winding voltage V generated on the primary winding 1111 after discharge is limited. 11 The voltage value is relatively small. At this time, the primary winding voltage V generated on the primary winding 1111 is... 11 Less than the secondary winding voltage V on the secondary winding 1113 12 This will not cause the output voltage V2 of the DC-DC transformer circuit 111 to increase. Therefore, after the controller 114 controls the capacitor in the half-bridge circuit 1110 to discharge, the primary winding voltage V generated on the primary winding 1111 will not increase. 11 Used only to boost the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113, such as Figure 7 As shown in the F2 direction. Therefore, the controller 114 and the power module 111 in which it is located, provided in this application embodiment, can not only prevent the controller 114 from restarting due to undervoltage protection, but also avoid increasing the ripple of the output voltage V2 of the DC-DC converter circuit 111, thereby improving the stability of the controller 114, the power module 11 in which it is located, and the electronic device 10.

[0111] Furthermore, the controller 114 provided in this application embodiment controls the discharge of the capacitor in the DC-DC converter circuit 111, thus avoiding the introduction of noise from the input power supply 13. This prevents noise from affecting the electromagnetic compatibility of the DC-DC converter circuit 111 and its associated power supply module 11 and electronic device 10. Therefore, the controller 114 provided in this application embodiment can improve the stability of its associated power supply module 11 and electronic device 10.

[0112] In one embodiment of this application, after the capacitor in the half-bridge circuit 1110 of the DC-DC converter circuit 111 begins to discharge, the controller 114 can also adjust the discharge rate based on the capacitor voltage V in the half-bridge circuit 1110. c The voltage value of the auxiliary winding circuit 112, the output voltage V4 of the auxiliary winding circuit 112, or the output voltage V5 of the power supply circuit 113 controls the capacitor in the half-bridge circuit 1110 to stop discharging.

[0113] In one embodiment, the controller 114 controls the auxiliary power transistor of the half-bridge circuit 1110 to turn off, thus disconnecting the discharge circuit formed by the primary winding 1111, the capacitor of the half-bridge circuit 1110, and the auxiliary power transistor. Accordingly, the capacitor in the half-bridge circuit 1110 stops discharging.

[0114] In one embodiment, the DC-DC converter 111 includes an AHB converter circuit, and the controller 114 controls the resonant capacitor C in the half-bridge circuit 1110. r Stop discharging. In one embodiment, the DC-DC converter circuit 111 includes an ACF converter circuit, and the controller 114 controls the clamping capacitor C in the half-bridge circuit 1110. c Stop discharging. In one embodiment, the half-bridge circuit 1110 of the DC-DC converter circuit 111 may also include multiple capacitors, and the controller 114 controls the multiple capacitors in the half-bridge circuit 1110 to stop discharging.

[0115] In the first embodiment, at time t4 after time t3, the capacitor voltage V in the half-bridge circuit 1110 is... c The voltage drops to less than or equal to the preset capacitor voltage value V. C3 In one embodiment, controller 114 determines the capacitor voltage V of the capacitor in half-bridge circuit 1110. c The voltage drops to less than or equal to the preset capacitor voltage value V. C3 The controller 114 controls the capacitor in the half-bridge circuit 1110 to stop discharging. In one embodiment, a preset capacitor voltage value V is provided. C3 It can be greater than or equal to the capacitor voltage V of the capacitor in the half-bridge circuit 1110 when the DC-DC converter circuit 111 is operating in continuous operation. C1 That is, the controller 114 determines the voltage V of the capacitor in the half-bridge circuit 1110 based on the capacitance V. c With the preset capacitor voltage value V C3 Based on the comparison results, controller 114 controls the capacitor in half-bridge circuit 1110 to stop discharging. Therefore, controller 114 can prevent the capacitor voltage from being too low and affecting the DC-DC converter circuit 111 to resume continuous operation by controlling the capacitor in half-bridge circuit 1110 to stop discharging, thereby further improving the stability of power module 11 and its associated electronic equipment 10.

[0116] In the second embodiment, at time t4 after time t3, the output voltage V4 of the auxiliary winding circuit 112 is increased to be greater than or equal to a fourth preset value V. 42 In one embodiment, the controller 114 determines that the output voltage V4 of the auxiliary winding circuit 112 is greater than or equal to a fourth preset value V. 42 The controller 114 controls the capacitor in the half-bridge circuit 1110 to stop discharging. Specifically, the voltage value V... 42 This is recorded as the fourth preset value, voltage value V. 42 This can be the highest input voltage of power supply circuit 113. Voltage value V 42 The voltage is greater than the rated input voltage V of power supply circuit 113. 40 And it is less than the overvoltage protection voltage of the power supply circuit 113. That is, the controller 114 determines the voltage value based on the output voltage V4 of the auxiliary winding circuit 112 and the fourth preset value V. 42 Based on the comparison results, controller 114 controls the capacitor in half-bridge circuit 1110 to stop discharging. Therefore, by controlling the capacitor in half-bridge circuit 1110 to stop discharging, controller 114 can prevent the output voltage V4 of auxiliary winding circuit 112 from being too high and damaging the power supply circuit 113 and controller 114, thereby further improving the stability of controller 114 and its power supply module 11 and electronic equipment 10.

[0117] In the third embodiment, at time t4 after time t3, the output voltage V5 of the power supply circuit 113 is increased to be greater than or equal to the fifth preset value V. 53 In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is greater than or equal to a fifth preset value V. 53 The controller 114 controls the capacitor in the half-bridge circuit 1110 to stop discharging. Specifically, the voltage value V... 53 Recorded as the fifth preset value, voltage value V 53 The rated input voltage V of controller 114 is greater than the rated input voltage V. 50 And it is less than the overvoltage protection voltage of controller 114. That is, controller 114 determines the voltage value based on the output voltage V5 of power supply circuit 113 and the fifth preset value V. 53 Based on the comparison results, controller 114 controls the capacitor in half-bridge circuit 1110 to stop discharging. Therefore, controller 114 can prevent the output voltage V4 of power supply circuit 113 from being too high and damaging controller 114 by controlling the capacitor in half-bridge circuit 1110 to stop discharging, thereby further improving the stability of controller 114 and its power supply module 11 and electronic equipment 10.

[0118] After time t4, once the capacitor in half-bridge circuit 1110 stops discharging, the capacitor voltage V... cThe voltage value stops decreasing. Correspondingly, the primary winding voltage V... 11 The voltage value of the auxiliary winding circuit 112 decreases, causing the voltage value of the auxiliary winding circuit 113 to decrease. Consequently, the voltage value of the output voltage V4 of the auxiliary winding circuit 112 decreases, and the voltage value of the output voltage V5 of the power supply circuit 113 decreases.

[0119] In one embodiment of this application, after time t4, when the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to a second preset value V 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At this time, the controller 114 can control the capacitor of the half-bridge circuit 1110 to discharge again. The specific process is as described in the above embodiment and will not be repeated. That is, the controller 114 can adjust the voltage value of the output voltage V4 of the auxiliary winding circuit 112 according to the second preset value V. 41 Based on the comparison result, the capacitor of the control half-bridge circuit 1110 is discharged again. Alternatively, the controller 114 can adjust the voltage value of the output voltage V5 of the power supply circuit 113 according to the third preset value V. 52 Based on the comparison results, the capacitor of the control half-bridge circuit 1110 is discharged again.

[0120] In one embodiment of this application, after the capacitor in the half-bridge circuit 1110 begins to discharge or stops discharging, the controller 114 further controls the operation state of the DC-DC converter 111 from a suspended operating state to a continuous operating state based on the voltage value of the output voltage V2 of the DC-DC converter 111. After time t2, the controller 114 controls the DC-DC converter 111 to operate in the suspended operating state, and correspondingly, the voltage value of the output voltage V2 of the DC-DC converter 111 decreases. In one embodiment, after the capacitor in the half-bridge circuit 1110 begins to discharge but before it stops discharging, the voltage value of the output voltage V2 of the DC-DC converter 111 decreases to less than or equal to the rated voltage V. 20 The controller 114 controls the DC-DC converter circuit 111 to switch its operating state from a paused state to a continuous operating state. In one embodiment, after the capacitor in the half-bridge circuit 1110 stops discharging, the output voltage V2 of the DC-DC converter circuit 111 drops to less than or equal to the rated voltage V. 20 The controller 114 controls the DC-DC converter circuit 111 to switch its operating state from a paused state to a continuous operating state.

[0121] At time t5, after time t3, the output voltage V2 of the DC-DC converter circuit 111 drops to less than or equal to the rated output voltage V. 20 The controller 114 determines when the output voltage V2 of the DC-DC converter circuit 111 drops to less than or equal to the rated output voltage V.20 The controller 114 controls the DC-DC converter circuit 111 to switch its operating state from a paused state to a continuous operating state. That is, the controller 114 adjusts the operating state based on the voltage value of the output voltage V2 of the DC-DC converter circuit 111 and the rated output voltage V. 20 Based on the comparison results, controller 114 switches the operating state of DC-DC converter 111 from a paused operating state to a continuous operating state. That is, between time t2 and time t5, controller 114 controls DC-DC converter 111 to operate in a paused operating state. After time t5, controller 114 controls DC-DC converter 111 to operate in a continuous operating state. After time t5, the output voltage V2 of DC-DC converter 111 increases to the rated output voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 is increased to V. 40 The output voltage V5 of power supply circuit 113 is increased to V. 50 .

[0122] In some embodiments of this application, the controller 114 may allow the capacitor voltage in the half-bridge circuit 1110 to drop to less than V. C1 Pre-stop discharge allows the DC-DC converter circuit 111 to switch from a paused working state to a continuous working state more quickly. Therefore, the control 114 provided in this application embodiment can improve the performance of the power supply module 11 and electronic device 10 in which it is located.

[0123] Figure 9 This is a schematic diagram of one embodiment of the power module provided in this application. Figure 9 The power module 11 shown can be applied to, for example Figure 1 or Figure 2 In the electronic device 10 shown. For example... Figure 9 The power supply module 11 shown includes an AHB converter circuit 111a, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The AHB converter circuit 111a receives the input voltage V1 from the input power supply 13 and provides an output voltage V2 to power the load 12. Additionally, the AHB converter circuit 111a supplies power to the power supply circuit 113 of the controller 114 via the auxiliary winding circuit 112. The auxiliary winding circuit 112 is coupled to the AHB converter circuit 111a, generating an auxiliary winding voltage V3 on the auxiliary winding 1121. The auxiliary winding circuit 112 converts the auxiliary winding voltage V3 into an output voltage V4 to power the power supply circuit 113. The power supply circuit 113 powers the control circuit 114. The controller 114 controls the operating state of the AHB converter circuit 111a.

[0124] Figure 10 This is a schematic diagram of one embodiment of the power module provided in this application.Figure 10 As shown, the power module 11 includes an AHB converter circuit 111a, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The AHB converter circuit 111a in the power module 11 includes a half-bridge circuit 1110a, a transformer 1112a, and a rectifier circuit 1114a. The transformer 1112a includes a primary winding 1111a and a secondary winding 1113a. Additionally, the transformer 1112a also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113a is coupled to the primary winding 1111a, and the auxiliary winding 1121 is coupled to the primary winding 1111a.

[0125] The half-bridge circuit 1110a receives the input voltage V1 provided by the input power supply 13 and provides the output voltage V to the primary winding 1111a according to the control signal of the controller 114. 10 A typical half-bridge circuit 1110a includes a main power transistor, an auxiliary power transistor, and a resonant capacitor.

[0126] The primary winding 1111a of transformer 1112a is used to receive the output voltage V of half-bridge circuit 1110a. 10 And generate primary winding voltage V 11 The secondary winding 1113a of transformer 1112a is coupled to the primary winding 1111a of transformer 1112a, and a secondary winding voltage V3 is generated on the secondary winding 1113a.

[0127] The rectifier circuit 1114a is used to receive the secondary winding voltage V3 on the secondary winding 1113a and convert it into the output voltage V2.

[0128] The auxiliary winding circuit 112 supplies power to the power supply circuit 113. The auxiliary winding 1121 of the auxiliary winding circuit 112 is coupled to the primary winding 1111a of the transformer 1112a. The primary winding voltage V on the primary winding 1112a... 11 After coupling, an auxiliary winding voltage V3 is generated on the auxiliary winding 1121. The auxiliary winding voltage V3 is then processed by the auxiliary winding circuit 112 and provides an output voltage V4 to the power supply circuit 113. The auxiliary winding circuit 112 may include the auxiliary winding 1121 and a rectifier module 1122.

[0129] Power supply circuit 113 supplies power to controller 114. Power supply circuit 113 receives the output voltage V4 from auxiliary winding circuit 112 and provides output voltage V5 to controller 114. That is, AHB converter circuit 111a supplies power to power supply circuit 113 of controller 114 via auxiliary winding circuit 112, which is coupled to the primary winding 1111 of its transformer 1112a. In some embodiments, power supply circuit 113 includes a voltage regulator circuit.

[0130] Controller 114 is used to control the operating status of AHB converter circuit 111a. Controller 114 is also used to detect the output voltage V2 of AHB converter circuit 111a, the output voltage V4 of auxiliary winding circuit 112, the output voltage V5 of power supply circuit 113, or the resonant capacitor C in half-bridge circuit 1110a. r capacitor voltage V Cr The controller 114 is also used to control the operating state of the AHB converter circuit 111a based on the changes in one or more of the aforementioned voltage values.

[0131] In one embodiment, control 114 sends a control signal G to control the operating state of the half-bridge circuit 1110a in the AHB converter circuit 111a, thereby controlling the operating state of the AHB converter circuit 111a. For example, the operating states of the AHB converter circuit 111a typically include a continuous operating state and a paused operating state. The continuous operating state can also be called the normal operating state, the controller's normal waveform generation state, etc. The paused operating state can also be called the intermittent operating state, the BURST operating state, the controller's intermittent waveform generation state, etc.

[0132] In this embodiment, the controller 114 can send a control signal G to control the on and off of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110a. By adjusting the frequency or duty cycle of the control signal G, the controller 114 can control the conduction frequency or conduction duration of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110a, thereby correspondingly adjusting the output voltage V of the half-bridge circuit 1110a. 10 The output voltage V of the half-bridge circuit 1110a 10 This will cause the primary winding voltage V 11 Change. Correspondingly, the primary winding voltage V... 11 Changes can lead to changes in the secondary winding voltage V. 12 And the auxiliary winding voltage V3 changes. Correspondingly, the secondary winding voltage V 12 The change in voltage V3 can cause a change in the output voltage V2 of the AHB converter circuit 111a. Correspondingly, the change in the auxiliary winding voltage V3 can cause a change in the output voltage V4 of the auxiliary winding circuit 112. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 can cause a change in the output voltage V5 of the power supply circuit 113.

[0133] like Figure 10 As shown in direction F1, the AHB converter circuit 111a can provide an output voltage V2 to power the load 12. The input voltage V1 is converted into the output voltage V2 through the half-bridge circuit 1110a, the primary winding 1111a, the secondary winding 1113a and the rectifier circuit 1114a in the AHB converter circuit 111a.

[0134] like Figure 10As shown in direction F2, the AHB converter circuit 111a can supply power to the power supply circuit 113 of the controller 114 through the auxiliary winding circuit 112. Specifically, the input voltage V1, after being processed by the half-bridge circuit 1110a in the AHB converter circuit 111a, can generate a primary winding voltage V0 in the primary winding 1111a. 11 Correspondingly, the primary winding voltage V 11 An auxiliary winding voltage V3 can be generated on the auxiliary winding 1121 of transformer 1112a. After being processed by the auxiliary winding circuit 1121, the auxiliary winding voltage V3 provides an output voltage V4 to power the power supply circuit 113 of controller 114.

[0135] Figure 11 A schematic diagram of the voltage waveform of the controller and its power module provided in this application under a scenario where the load level drops. The following section combines... Figure 10 and Figure 11 This application details the operation of the controller 114 and its power module 11 in a scenario where the load level L of the load 12 drops.

[0136] Before time t1, the load level L of load 12 is the normal load L1. Controller 114 controls the AHB converter circuit 111a to operate in continuous operation, and controller 114 controls the output voltage V2 of the AHB converter circuit 111a to be the rated output voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 has a value of V. 40 The output voltage V5 of power supply circuit 113 has a voltage value of V. 50 The resonant capacitor C in half-bridge circuit 1111a r capacitor voltage V Cr The voltage value is V Cr1 V Cr1 The resonant capacitor C is used when the AHB converter circuit 111a is operating in continuous operation. r The capacitor voltage.

[0137] At time t1, the load level of load 12 drops from normal load L1 to light load L2. Correspondingly, after time t1, the output voltage V2 of the AHB converter circuit 111a increases to a value greater than the rated output voltage V. 20 .

[0138] In one embodiment, when the output voltage V2 of the AHB converter circuit 111a is greater than the rated output voltage V... 20The controller 114 can control the AHB converter circuit 111a to operate in a continuous working state. Furthermore, the controller controls the AHB converter circuit 111a to reduce the output voltage V2. That is, the controller 114 adjusts the output voltage V2 of the AHB converter circuit 111a based on the voltage difference between the output voltage V2 and the rated output voltage V. 20 Based on the comparison results, controller 114 controls the AHB converter circuit 111a to operate in a continuous working state, and controller 114 controls the AHB converter circuit 111a to reduce the output voltage V2. Specifically, controller 114 sends a control signal G to control the operating state of the main power transistor and auxiliary power transistor in the half-bridge circuit 1110a, so that the primary winding voltage V2 is reduced. 11 The voltage value decreases. In one embodiment, the controller 114 can reduce the transmission frequency of the control signal G, thereby reducing the conduction frequency of the main power transistor and the auxiliary power transistor. In one embodiment, the controller 114 can reduce the duty cycle of the control signal G, thereby reducing the conduction time of the main power transistor and the auxiliary power transistor. In another embodiment, when the output voltage V2 of the AHB converter circuit 111a is greater than the rated voltage V... 20 The controller 114 can control the AHB converter circuit 111a to operate in a suspended state, and can also reduce the output voltage V2. However, in both of the above embodiments, the output voltage V2 of the AHB converter circuit 111a may not be reduced effectively, and the output voltage V2 of the AHB converter circuit 111a will continue to increase after time t1.

[0139] Meanwhile, after time t1, the drop in load level L causes the output voltage V2 of the AHB converter circuit 111a to be higher than the rated voltage V. 20 Primary winding voltage V 11 The resonant capacitor C in the half-bridge circuit 1110a r Charging, resonant capacitor C in half-bridge circuit 1110a r capacitor voltage V Cr The voltage value from V Cr1 Upgrade to V Cr2 V Cr2 The resonant capacitor C in the half-bridge circuit 1110a r Maximum charging voltage.

[0140] At time t2, after time t1, the output voltage V2 of the AHB converter circuit 111a increases to the first preset value V. 21 The controller 114 determines that the output voltage V2 of the AHB conversion circuit 111a is greater than or equal to a first preset value V. 21The controller 114 controls the AHB converter circuit 111a to stop working. That is, the controller 114 determines the voltage value of the output voltage V2 of the AHB converter circuit 111a based on the first preset value V. 21 Based on the comparison results, controller 114 controls the AHB converter circuit 111a to operate in a suspended state. Specifically, controller 114 controls both the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110a to be turned off. In this embodiment, the first preset value V 21 This can be the peak voltage of the AHB converter circuit 111a. The peak voltage of the AHB converter circuit 111a is greater than the rated voltage V. 20 And it is less than the overvoltage protection voltage of the AHB converter circuit 111a.

[0141] After time t2, controller 114 controls the AHB converter circuit 111a to operate in a suspended state. Correspondingly, the primary winding voltage V on the primary winding 1111a of the AHB converter circuit 111a... 11 The voltage value drops, thus causing the secondary winding voltage V to decrease. 12 The voltage drops, causing the auxiliary winding voltage V3 to drop. Accordingly, the output voltage V2 of the AHB converter circuit 111a drops, the output voltage V4 of the auxiliary winding circuit 112 drops, and the output voltage V5 of the power supply circuit 113 drops.

[0142] At time t3, after time t2, the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to the second preset value V. 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At this time, controller 114 controls the resonant capacitor C in half-bridge circuit 1110a. r Discharge.

[0143] In one embodiment, controller 114 determines that the output voltage V4 of auxiliary winding circuit 112 is less than or equal to a second preset value V. 41 The controller 114 controls the resonant capacitor C in the half-bridge circuit 1110a. r Discharge. That is, the controller 114 discharges the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the second preset value V. 41 The comparison results control the resonant capacitor C in the half-bridge circuit 1110a. r Discharge.

[0144] In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is less than or equal to a third preset value V. 52 The controller 114 controls the resonant capacitor C in the half-bridge circuit 1110a. rDischarge. That is, the controller 114 discharges the voltage value of the output voltage V5 of the power supply circuit 113 and the third preset value V. 52 The comparison results show that controller 114 controls the resonant capacitor C in half-bridge circuit 1110a. r Discharge.

[0145] In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110a to turn on, thereby turning on the resonant capacitor C in half-bridge circuit 1110a. r Discharge. The resonant capacitance C of the primary winding 1111a and the half-bridge circuit 1110a. r The auxiliary power transistor in the half-bridge circuit 1110a can form a discharge circuit. Correspondingly, the resonant capacitor C of the half-bridge circuit 1110a... r Discharge can generate a primary winding voltage V on the primary winding 1111a. 11 .

[0146] In one embodiment, the controller 114 controls the auxiliary power transistor in the half-bridge circuit 1110a to be periodically turned on, causing the resonant capacitor C in the half-bridge circuit 1110a to... r Discharge. When the auxiliary power transistor of the half-bridge circuit 1110a is turned on, the resonant capacitance C of the primary winding 1111a and the half-bridge circuit 1110a... r The auxiliary power transistor in the half-bridge circuit 1110a can form a discharge circuit. Correspondingly, the periodic conduction of the auxiliary power transistor in the half-bridge circuit 1110a allows the resonant capacitor C in the half-bridge circuit 1110a to... r Discharges periodically.

[0147] After time t3, the resonant capacitor C in the half-bridge circuit 1110a r capacitor voltage V Cr The voltage value drops. The resonant capacitor C in the half-bridge circuit 1110a... r Discharge causes the primary winding voltage V on the primary winding 1111a to be reduced. 11 The voltage value increases. Correspondingly, the primary winding voltage V... 11 An increase in the voltage value of the auxiliary winding will cause an increase in the voltage value of the auxiliary winding voltage V3. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases. Therefore, in scenarios where the load level of the load 12 changes, the output voltage V5 of the power supply circuit 113 will not drop below the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection.

[0148] The controller 114 provided in this embodiment controls the resonant capacitor C in the half-bridge circuit 1110a of the AHB conversion circuit 111a.r Discharging allows the output voltage V5 of the power supply circuit 113 to be higher than the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection. Therefore, the controller 114 provided in this embodiment can improve the stability of the power module 11 and electronic device 10 in which it resides.

[0149] Because of the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a r The stored energy is limited, and the primary winding voltage V generated on the primary winding 1111a after discharge is... 11 The voltage value is relatively small. At this time, the primary winding voltage V generated on the primary winding 1111a is... 11 Less than the secondary winding voltage V on the secondary winding 1113 12 This will not cause the output voltage V2 of the AHB converter circuit 111a to increase. Therefore, the controller 114 controls the resonant capacitor C in the half-bridge circuit 1110a. r After discharge, the primary winding voltage V generated on the primary winding 1111a 11 Used only to boost the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113, such as Figure 10 As shown in the F2 direction. Therefore, the controller 114 and the power module 111 in which it is located, provided in this application embodiment, can not only prevent the controller 114 from restarting due to undervoltage protection, but also avoid increasing the ripple of the output voltage V2 of the AHB conversion circuit 111a, thereby improving the stability of the controller 114, the power module 11 in which it is located, and the electronic device 10.

[0150] Furthermore, the controller 114 provided in this application embodiment controls the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a. r This avoids introducing noise from the input power supply 13, thus preventing noise from affecting the electromagnetic compatibility of the AHB converter circuit 111a and its associated power supply module 11 and electronic device 10. Therefore, the controller 114 provided in this embodiment can improve the stability of its associated power supply module 11 and electronic device 10.

[0151] In one embodiment of this application, the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a... r After the discharge begins, the controller 114 can also adjust the resonant capacitance C in the half-bridge circuit 1110a. r capacitor voltage V Cr The voltage value of the auxiliary winding circuit 112, the output voltage V4 of the auxiliary winding circuit 112, or the output voltage V5 of the power supply circuit 113 controls the resonant capacitor C in the half-bridge circuit 1110a. rDischarge is stopped. In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110a to turn off, and the resonant capacitor C of primary winding 1111a and half-bridge circuit 1110a is also turned off. r The discharge circuit formed by the auxiliary power transistor of the half-bridge circuit 1110a is broken. Correspondingly, the resonant capacitor C of the half-bridge circuit 1110a... r Stop discharging.

[0152] In the first embodiment, at time t4 after time t3, the resonant capacitance C of the half-bridge circuit 1110a... r capacitor voltage V Cr The voltage drops to less than or equal to the preset capacitor voltage value V. Cr3 In one embodiment, controller 114 determines the resonant capacitance C of half-bridge circuit 1110a. r capacitor voltage V Cr The voltage drops to less than or equal to the preset capacitor voltage value V. Cr3 The controller 114 controls the resonant capacitor C of the half-bridge circuit 1110a. r Stop discharging. In one embodiment, a preset capacitor voltage value V is established. Cr3 It can be greater than or equal to the resonant capacitance C of the half-bridge circuit 1110a when the AHB converter circuit 111a is operating in continuous operation. r The voltage value V of the capacitor voltage Cr1 That is, the controller 114 determines the resonant capacitance C of the half-bridge circuit 1110a. r capacitor voltage V Cr With the preset capacitor voltage value V Cr3 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. r Discharge stops. Therefore, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a. r Stopping the discharge can prevent the resonant capacitor C from being discharged. r capacitor voltage V Cr The low temperature affects the AHB conversion circuit 111a's ability to resume continuous operation, further improving the stability of the power supply module 11 and the electronic device 10 it is located in.

[0153] In the second embodiment, at time t4 after time t3, the output voltage V4 of the auxiliary winding circuit 112 is increased to be greater than or equal to a fourth preset value V. 42 In one embodiment, the controller 114 determines that the output voltage V4 of the auxiliary winding circuit 112 is greater than or equal to a fourth preset value V. 42 The controller 114 controls the resonant capacitor C of the half-bridge circuit 1110a. rStop discharging. That is, the controller 114 stops discharging based on the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the fourth preset value V. 42 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. r Discharge stops. Therefore, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a. r Stopping the discharge can prevent the output voltage V4 of the auxiliary winding circuit 112 from becoming too high and damaging the power supply circuit 113 and the controller 114, further improving the stability of the controller 114 and the power supply module 11 and electronic equipment 10 in which it is located.

[0154] In the third embodiment, at time t4 after time t3, the output voltage V5 of the power supply circuit 113 is increased to be greater than or equal to the fifth preset value V. 53 In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is greater than or equal to a fifth preset value V. 53 The controller 114 controls the resonant capacitor C of the half-bridge circuit 1110a. r Stop discharging. That is, the controller 114 determines the voltage value of the output voltage V5 of the power supply circuit 113 and the fifth preset value V. 53 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. r Discharge stops. Therefore, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a. r Stop discharging to prevent the output voltage V4 of the power supply circuit 113 from becoming too high and damaging the controller 114, thereby further improving the stability of the controller 114 and its power supply module 11 and electronic equipment 10.

[0155] After time t4, the resonant capacitor Cr of the half-bridge circuit 1110a stops discharging, and the resonant capacitor C... r capacitor voltage V Cr The voltage value stops decreasing. Correspondingly, the primary winding voltage V... 11 The voltage value of the auxiliary winding circuit 112 decreases, causing the voltage value of the auxiliary winding circuit 113 to decrease. Consequently, the voltage value of the output voltage V4 of the auxiliary winding circuit 112 decreases, and the voltage value of the output voltage V5 of the power supply circuit 113 decreases.

[0156] In one embodiment of this application, after time t4, when the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to a second preset value V 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At that time, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a.r Discharge again. The specific process is as described in the above embodiments and will not be repeated. That is, the controller 114 can adjust the voltage value of the output voltage V4 of the auxiliary winding circuit 112 according to the second preset value V. 41 The comparison results show that the resonant capacitor C of the half-bridge circuit 1110a is controlled. r Discharge again. Alternatively, controller 114 can adjust the output voltage V5 of power supply circuit 113 based on the voltage value and a third preset value V. 52 The comparison results show that the resonant capacitor C of the half-bridge circuit 1110a is controlled. r Discharge again.

[0157] In one embodiment of this application, in the resonant capacitor C of the half-bridge circuit 1110a r After discharge begins or stops, the controller 114 will also control the operation state of the AHB converter 111a from a paused state to a continuous operating state based on the voltage value of the output voltage V2 of the AHB converter 111a. After time t2, the controller 114 controls the AHB converter 111a to operate in the paused state, and correspondingly, the voltage value of the output voltage V2 of the AHB converter 111a decreases. In one embodiment, the resonant capacitor C of the half-bridge circuit 1110a... r After discharge begins and before discharge stops, the output voltage V2 of the AHB converter circuit 111a drops to a value less than or equal to the rated voltage V. 20 The controller 114 controls the AHB converter circuit 111a to switch its operating state from a paused state to a continuous operating state. In one embodiment, the resonant capacitor C of the half-bridge circuit 1110a... r After the discharge stops, the output voltage V2 of the AHB converter circuit 111a drops to less than or equal to the rated voltage V. 20 The controller 114 controls the AHB conversion circuit 111a to switch its operating state from a paused working state to a continuous working state.

[0158] At time t5, after time t3, the output voltage V2 of the AHB converter circuit 111a drops to less than or equal to the rated voltage V. 20 The controller 114 determines when the output voltage V2 of the AHB converter circuit 111a drops to less than or equal to the rated voltage V. 20 The controller 114 switches the operating state of the AHB converter circuit 111a from a paused operating state to a continuous operating state. Specifically, the controller 114 adjusts the voltage value of the output voltage V2 of the AHB converter circuit 111a according to the voltage ratio of the rated voltage V. 20Based on the comparison results, the operating state of the AHB converter circuit 111a is switched from the paused operation state to the continuous operation state. After time t5, the output voltage V2 of the AHB converter circuit 111a recovers to the rated voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 is restored to V. 40 The output voltage V5 of power supply circuit 113 returns to V. 50 .

[0159] Figure 12 This is a schematic diagram of one embodiment of the power module provided in this application. Figure 12 It shows Figure 10 A schematic diagram of part of the circuitry in the power supply module 11 is shown. (See diagram below.) Figure 12 As shown, the power module 11 includes an AHB converter circuit 111a, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The AHB converter circuit 111a includes a half-bridge circuit 1110a, a transformer 1112a, and a rectifier circuit 1114a. The transformer 1112a includes a primary winding 1111a and a secondary winding 1113a. Additionally, the transformer 1112a also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113a is coupled to the primary winding 1111a, and the auxiliary winding 1121 is coupled to the primary winding 1111a.

[0160] The half-bridge circuit 1110a includes the main power transistor Q. L Auxiliary power transistor Q H and resonant capacitor C r Main power transistor Q L Auxiliary power transistor Q H and resonant capacitor C r This forms an asymmetric half-bridge topology. Specifically, the resonant capacitance C... r The first end is connected to the opposite end of the primary winding 1111a, and the resonant capacitor C r The second end is connected to the auxiliary power transistor Q. H The drain of the auxiliary power transistor Q. H The source terminal is connected to the same terminal of the primary winding 1111a and the main power transistor Q. L The drain of the main power transistor Q. L The source of the transistor is grounded. In one embodiment, the main power transistor Q... L The gate is used to receive the second control signal G from the controller 114. H Auxiliary power transistor Q H The gate is used to receive the first control signal G from the controller 114. L .

[0161] The rectifier circuit 1114a includes a capacitor C1 and a diode D2. The anode of the diode D2 is connected to the same-name terminal of the secondary winding 1113a. The two ends of the capacitor C1 are connected to the cathode of the diode D2 and the opposite-name terminal of the secondary winding 1113a, respectively.

[0162] The auxiliary winding circuit 112 includes an auxiliary winding 1121 and a rectifier module 1122. The rectifier module 1122 may include a diode D1. The anode of the diode D1 is connected to the same-name terminal of the auxiliary winding 1121, and the cathode of the diode D1 and the opposite-name terminal of the auxiliary winding 1121 are connected to the power supply circuit 113.

[0163] The power supply circuit 113 may include a boost circuit. In one embodiment, the power supply circuit 113 may also be a buck circuit, a buck-boost circuit, etc. In one embodiment, the power supply circuit 113 may also be a low dropout regulator (LDO) or other voltage regulator circuit.

[0164] The controller 114 includes a detection unit 1141 and a driving unit 1142. In some embodiments, when the driving unit 1142 is a chip, the power supply circuit 113 can be connected to the power supply pin of the driving unit 1142. For example, the power supply pin can be... Figure 12 The label shown is "V" dd The pin of "".

[0165] The detection unit 1141 is used to detect the output voltage V2 of the AHB converter circuit 111a, the output voltage V4 of the auxiliary winding circuit 112, the output voltage V5 of the power supply circuit 113, or the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a. r capacitor voltage V Cr The voltage values ​​vary among multiple voltage values. The drive circuit 1142 is used to control the operating state of the AHB conversion circuit 111a according to the changes in one or more of the above voltage values.

[0166] For example, the detection unit 1141 can be connected Figure 12 Point A at the output terminal of the secondary winding circuit 1114a detects the voltage value of the output voltage V2 of the AHB converter circuit 111a. The detection unit 1141 can be connected via... Figure 12 Point B at the output terminal of the auxiliary winding circuit 112 is used to detect the voltage value of the output voltage V4 of the auxiliary winding circuit 112. The detection unit 1141 can be connected via... Figure 12 Point C at the output terminal of the power supply circuit 113 is used to detect the output voltage V5 of the power supply circuit 113. The detection unit 1141 can be connected via... Figure 12 Resonant capacitor Cr At point D on either side, detect the resonant capacitance C. r capacitor voltage V Cr The voltage value.

[0167] The drive unit 1142 is used to control the operating state of the AHB conversion circuit 111a. Specifically, the drive unit 1142 sends a control signal G... L / G H Control main power transistor Q L and auxiliary power transistor Q H The switching on and off of the drive unit controls the operating state of the AHB converter circuit 111a. In some embodiments, when the drive unit 1142 is a chip, Figure 12 The drive unit 1142 shown can be driven by its label "G" H The pin sends a control signal G. H It can be accessed through its label "G" L The pin sends a control signal G. L . Figure 12 The pin labels are for illustrative purposes only; in practical applications, other pin labels of the driver unit 1142 can also be used. Figure 13 The pins shown in the diagram have functions.

[0168] The drive unit 1142 sends power to the main power transistor Q. L Send the first control signal G L Method of controlling the main power transistor Q L Turning the circuit on or off. The drive unit 1142 controls the auxiliary power transistor Q by... H Send the second control signal G H Method of controlling auxiliary power transistor Q H To turn on or off. In this embodiment, the controller 114 sends a first control signal G. L Second control signal G H This can be implemented using high-level signals or low-level signals. In one embodiment, the main power transistor Q... L According to the first control signal G L Turn on, auxiliary power transistor Q H According to the second control signal G H Turn-on. In one embodiment, the main power transistor Q is turned on. L According to the first control signal G L Turn off, auxiliary power transistor Q H According to the second control signal G H Turn off.

[0169] Figure 11 This is a schematic diagram of the control signals provided by the controller in this application in a scenario where the load level of the power module drops. The following is in conjunction with... Figure 12, Figure 13 and Figure 14 This describes the operation of the controller 114 and its power module 11 provided in this application in a scenario where the load level L of the load 12 drops.

[0170] Before time t1, the load level of load 12 is the normal load L1. Controller 114 controls the AHB converter circuit 111a to operate in continuous operation and controls the output voltage V2 of the AHB converter circuit 111a to be the rated voltage V. 20 At this time, the output voltage V4 of the auxiliary winding circuit 112 is V. 40 The output voltage V5 of power supply circuit 113 has a voltage value of V. 50 The resonant capacitor C in half-bridge circuit 1111a r capacitor voltage V Cr The voltage value is V Cr1 .

[0171] Figure 14 This is a schematic diagram of the control signals of the controller provided in an embodiment of this application. Figure 13 As shown, each of the control signals G1, G2, G3... sent by controller 114 includes a signal to the main power transistor Q. L The first control signal G sent L Or to the auxiliary power transistor Q H The second control signal G sent H Controller 114 controls the main power transistor Q. L and auxiliary power transistor Q H By periodically switching on and off, the half-bridge circuit 1110a can generate a primary winding voltage V in the primary winding 1111a. 11 The primary winding voltage V on the primary winding 1111a 11 Through coupling, a secondary winding voltage V can be generated on the secondary winding 1113a. 12 And an auxiliary winding voltage V3 can be generated on the auxiliary winding 1121. Accordingly, the rectifier circuit 1114a provides an output voltage V2 to the load 12, the auxiliary winding circuit 112 provides an output voltage V4 to the power supply circuit 113, and the power supply circuit 113 provides an output voltage V5 to the controller 115. 50 Because the output voltage V2 of the AHB converter circuit 111a to the load 12 is stable at the rated voltage V... 20 The resonant capacitor C in the half-bridge circuit 1110a r voltage value V Cr Stable at V Cr1 .

[0172] At time t1, the load level of load 12 drops from normal load L1 to light load L2. After time t1, the output voltage V2 of the AHB converter circuit 111a increases to a value greater than the rated voltage V. 20 .

[0173] In one embodiment, the controller 114 determines the voltage value of the output voltage V2 of the AHB converter circuit 111a and the rated voltage V. 20 Based on the comparison results, the AHB converter circuit 111a is controlled to operate in a continuous working state, and the controller 114 controls the AHB converter circuit 111a to reduce the output voltage V2.

[0174] Specifically, the detection unit 1141 of the controller 114 detects the output voltage V2 of the AHB conversion circuit 111a and determines that the output voltage V2 of the AHB conversion circuit 111a is greater than the rated voltage V. 20 Accordingly, controller 114 controls the AHB conversion circuit 111a to operate in a continuous working state, and controller 114 reduces the first control signal G. L Second control signal G H The transmission frequency, or the first control signal G is reduced. L Second control signal G H Duty cycle. For example... Figure 14 As shown, the frequencies of control signals G4, G5, and G6 sent by controller 114 after time t1 are less than the frequencies of control signals G1, G2, and G3 periodically sent before time t1. Correspondingly, the main power transistor Q... L and auxiliary power transistor Q H The reduced frequency of switching on and off causes a decrease in the output voltage V2 of the AHB converter circuit 111a. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 decreases, and the output voltage V5 of the power supply circuit 113 decreases. However, this method may not effectively reduce the output voltage V2 of the AHB converter circuit 111a, and the output voltage V2 of the AHB converter circuit 111a will continue to increase.

[0175] After time t1, the output voltage V2 of the AHB converter circuit 111a is higher than the rated voltage V. 20 At this time, the primary winding voltage V 11 The resonant capacitor C in the half-bridge circuit 1110a r Charging, resonant capacitor C in half-bridge circuit 1110a r capacitor voltage V Cr The voltage value from V Cr1 Upgrade to V Cr2 .

[0176] At time t2, after time t1, the output voltage V2 of the AHB converter circuit 111a increases to a value greater than or equal to the first preset value V. 21 The controller 114 determines the voltage value of the output voltage V2 of the AHB conversion circuit 111a and the first preset value V. 21 Based on the comparison results, controller 114 controls AHB converter circuit 111a to operate in a suspended state. Specifically, the detection unit 1141 of controller 114 detects the voltage value of the output voltage V2 of AHB converter circuit 111a and determines that the voltage value of the output voltage V2 of AHB converter circuit 111a is greater than or equal to a first preset value V. 21 Accordingly, the drive unit 1142 of the controller 114 stops sending the first control signal G. L Second control signal G H This controls the AHB converter circuit 111a to operate in a suspended state. Consequently, the AHB converter circuit 111a does not process the received input voltage V1, and the output voltage V2 of the AHB converter circuit 111a decreases.

[0177] After time t2, controller 114 controls the AHB converter circuit 111a to operate in a suspended state. Correspondingly, the primary winding voltage V on the primary winding 1111a of the AHB converter circuit 111a... 11 The voltage value drops, thus causing the secondary winding voltage V to decrease. 12 The voltage drops, causing the auxiliary winding voltage V3 to drop. Accordingly, the output voltage V2 of the AHB converter circuit 111a drops, the output voltage V4 of the auxiliary winding circuit 112 drops, and the output voltage V5 of the power supply circuit 113 drops.

[0178] At time t3, after time t2, the output voltage V4 of the auxiliary winding circuit 112 drops below the second preset value V. 41 Or the output voltage V5 of the power supply circuit 113 drops below the third preset value V 52 At this time, controller 114 controls the resonant capacitor C in half-bridge circuit 1110a. r Discharge.

[0179] In one embodiment, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and determines that the voltage value of the output voltage V4 of the auxiliary winding circuit 112 is less than or equal to a second preset value V. 41 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H The circuit is on. At this time, the resonant capacitor C of the half-bridge circuit 1110a is turned on. rThe power transistor Q of the primary winding 1111a and the half-bridge circuit 1110a H To form a discharge circuit, the resonant capacitor C of the half-bridge circuit 1110a... r Discharge begins.

[0180] In one embodiment, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V5 of the power supply circuit 113 and determines that the voltage value of the output voltage V5 of the power supply circuit 113 is less than or equal to a third preset value V. 52 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H The circuit is on. At this time, the resonant capacitor C of the half-bridge circuit 1110a is turned on. r The power transistor Q of the primary winding 1111a and the half-bridge circuit 1110a H To form a discharge circuit, the resonant capacitor C of the half-bridge circuit 1110a... r Discharge begins.

[0181] After time t3, the resonant capacitor C in the half-bridge circuit 1110a r capacitor voltage V Cr The voltage value drops. The resonant capacitor C in the half-bridge circuit 1110a... r Discharge causes the primary winding voltage V on the primary winding 1111a to be reduced. 11 The voltage value increases. Correspondingly, the auxiliary winding voltage V3 increases, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases. Therefore, in scenarios where the load level of load 12 changes, the output voltage V5 of the power supply circuit 113 will not drop below the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection.

[0182] The controller 114 provided in this embodiment controls the resonant capacitor C in the half-bridge circuit 1110a of the AHB conversion circuit 111a. r Discharging allows the output voltage V5 of the power supply circuit 113 to be higher than the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection. Therefore, the controller 114 provided in this embodiment can improve the stability of the power module 11 and electronic device 10 in which it resides.

[0183] Because of the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a r The stored energy is limited, and the primary winding voltage V generated on the primary winding 1111a after discharge is... 11The voltage value is relatively small. At this time, the primary winding voltage V generated on the primary winding 1111a is... 11 Less than the secondary winding voltage V on the secondary winding 1113 12 This will not cause the output voltage V2 of the AHB converter circuit 111a to increase. Therefore, the controller 114 controls the resonant capacitor C in the half-bridge circuit 1110a. r After discharge, the primary winding voltage V generated on the primary winding 1111a 11 It is only used to boost the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113. Therefore, the controller 114 and the power supply module 111 provided in this application embodiment can not only prevent the controller 114 from restarting due to undervoltage protection, but also avoid increasing the ripple of the output voltage V2 of the AHB conversion circuit 111a, thereby improving the stability of the controller 114, the power supply module 11, and the electronic device 10.

[0184] Furthermore, the controller 114 provided in this application embodiment controls the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a. r This avoids introducing noise from the input power supply 13, thus preventing any impact on the electromagnetic compatibility of the AHB converter circuit 111a and its associated power supply module 11 and electronic device 10. Therefore, the controller 114 provided in this embodiment can improve the stability of its associated power supply module 11 and electronic device 10.

[0185] In one embodiment of this application, the controller 114 can also control the resonant capacitor C in the half-bridge circuit 1110a of the AHB converter circuit 111a. r Stop discharging.

[0186] In the first embodiment, at time t4 after time t3, the resonant capacitance C of the half-bridge circuit 1110a... r capacitor voltage V Cr The voltage drops to less than or equal to the preset capacitor voltage value V. Cr3 In one embodiment, a preset capacitor voltage value V is provided. Cr3 It can be greater than or equal to the resonant capacitance C of the half-bridge circuit 1110a when the AHB converter circuit 111a is operating in continuous operation. r The voltage value V of the capacitor voltage Cr1 The controller 114 determines the resonant capacitance C of the half-bridge circuit 1110a. r capacitor voltage V Cr With the preset capacitor voltage value V Cr3 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. rStop discharging. Specifically, the detection unit 1141 of the controller 114 detects the resonant capacitance C of the half-bridge circuit 1110a. r capacitor voltage V Cr And determine the resonant capacitance C of the half-bridge circuit 1110a. r capacitor voltage V Cr Less than or equal to the preset capacitor voltage value V Cr3 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the resonant capacitor C of the half-bridge circuit 1110a... r The power transistor Q of the primary winding 1111a and the half-bridge circuit 1110a H The discharge circuit formed is broken, and the resonant capacitor C of the half-bridge circuit 1110a is broken. r Stop discharging.

[0187] Therefore, the controller 114 can utilize the resonant capacitor C of the half-bridge circuit 1110a. r Stopping the discharge can prevent the resonant capacitor C from being discharged. r capacitor voltage V Cr The low temperature affects the AHB conversion circuit 111a's ability to resume continuous operation, further improving the stability of the power supply module 11 and the electronic device 10 it is located in.

[0188] In the second embodiment, at time t4 after time t3, the output voltage V4 of the auxiliary winding circuit 112 is increased to be greater than or equal to a fourth preset value V. 42 The controller 114 determines the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the fourth preset value V. 42 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. r Discharge is stopped. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and determines that the voltage value of the output voltage V4 of the auxiliary winding circuit 112 is less than or equal to the preset capacitor voltage value V. Cr3 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the resonant capacitor C of the half-bridge circuit 1110a... r The power transistor Q of the primary winding 1111a and the half-bridge circuit 1110a H The discharge circuit formed is broken, and the resonant capacitor C of the half-bridge circuit 1110a is broken. r Stop discharging.

[0189] Therefore, the controller 114 can utilize the resonant capacitor C of the half-bridge circuit 1110a.r Stopping the discharge can prevent the output voltage V4 of the auxiliary winding circuit 112 from becoming too high and damaging the power supply circuit 113 and the controller 114, further improving the stability of the controller 114 and the power supply module 11 and electronic equipment 10 in which it is located.

[0190] In the third embodiment, at time t4 after time t3, the output voltage V5 of the power supply circuit 113 is increased to be greater than or equal to the fifth preset value V. 53 The controller 114 determines the voltage value of the output voltage V5 of the power supply circuit 113 and the fifth preset value V. 53 The comparison results show that controller 114 controls the resonant capacitor C of half-bridge circuit 1110a. r Discharge is stopped. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V5 of the power supply circuit 113 and determines that the voltage value of the output voltage V5 of the power supply circuit 113 is greater than or equal to a fifth preset value V. 53 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the resonant capacitor C of the half-bridge circuit 1110a... r The power transistor Q of the primary winding 1111a and the half-bridge circuit 1110a H The discharge circuit formed is broken, and the resonant capacitor C of the half-bridge circuit 1110a is broken. r Stop discharging.

[0191] Therefore, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a. r Stop discharging to prevent the output voltage V4 of the power supply circuit 113 from becoming too high and damaging the controller 114, thereby further improving the stability of the controller 114 and its power supply module 11 and electronic equipment 10.

[0192] After time t4, the resonant capacitance C of the half-bridge circuit 1110a... r After the discharge stops, the resonant capacitor C r capacitor voltage V Cr The voltage value stops decreasing. Correspondingly, the primary winding voltage V... 11 The voltage value of the auxiliary winding circuit 112 decreases, causing the voltage value of the auxiliary winding circuit 113 to decrease. Consequently, the voltage value of the output voltage V4 of the auxiliary winding circuit 112 decreases, and the voltage value of the output voltage V5 of the power supply circuit 113 decreases.

[0193] In one embodiment of this application, after time t4, when the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to a second preset value V 41The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At that time, controller 114 can control the resonant capacitor C of half-bridge circuit 1110a. r Discharge again. The specific process is as described in the above embodiments and will not be repeated.

[0194] In one embodiment of this application, in the resonant capacitor C of the half-bridge circuit 1110a r After discharge begins or stops, the controller 114 will also control the operation state of the AHB converter 111a from a paused state to a continuous operating state based on the voltage value of the output voltage V2 of the AHB converter 111a. After time t2, the controller 114 controls the AHB converter 111a to operate in the paused state, and correspondingly, the voltage value of the output voltage V2 of the AHB converter 111a decreases. In one embodiment, the resonant capacitor C of the half-bridge circuit 1110a... r After discharge begins and before discharge stops, the output voltage V2 of the AHB converter circuit 111a drops to a value less than or equal to the rated voltage V. 20 The controller 114 controls the AHB converter circuit 111a to switch its operating state from a paused state to a continuous operating state. In one embodiment, the resonant capacitor C of the half-bridge circuit 1110a... r After the discharge stops, the output voltage V2 of the AHB converter circuit 111a drops to less than or equal to the rated voltage V. 20 The controller 114 controls the AHB conversion circuit 111a to switch its operating state from a paused working state to a continuous working state.

[0195] At time t5, after time t3, the output voltage V2 of the AHB converter circuit 111a drops to less than or equal to the rated output voltage V. 20 The controller 114 determines the voltage value of the output voltage V2 of the AHB converter circuit 111a and the rated output voltage V. 20 Based on the comparison results, the operating state of the AHB converter circuit 111a is switched from a paused operating state to a continuous operating state. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V2 of the AHB converter circuit 111a and determines whether the voltage value of the output voltage V2 of the AHB converter circuit 111a is less than or equal to the rated output voltage V. 20 The drive unit 1142 of the controller 114 periodically sends the first control signal G. L Second control signal G H Control the main power transistor Q L and auxiliary power transistor Q HPeriodic switching on and off allows the AHB converter circuit 111a to resume continuous operation. At this time, the controller 114 sends the first control signal G. L Second control signal G H These are denoted as G7, G8, G9… The specific implementation of each control signal G7, G8, G9… is as follows… Figure 15 The same applies as shown, and will not be repeated. For example, the periods of control signals G7, G8, G9… can also be the same as the periods of control signals G1, G2, G3… or the same as the periods of G4, G5, G6… etc. After time t5, the output voltage V2 of the AHB converter circuit 111a recovers to the rated output voltage V… 20 The output voltage V4 of the auxiliary winding circuit 112 is restored to V. 40 The output voltage V5 of power supply circuit 113 returns to V. 50 .

[0196] Figure 15 This is a schematic diagram of an embodiment of the controller provided in this application controlling the discharge of the resonant capacitor in the AHB converter circuit. Figure 13 and Figure 11 The difference lies in that the controller 114 controls the resonant capacitor C of the primary winding circuit 1111a in the AHB converter circuit 111a. r Periodic discharge. The following text combines... Figure 15 and Figure 16 To explain.

[0197] At time t3, controller 114 controls the auxiliary power transistor Q in half-bridge circuit 1110a. H The periodic conduction causes the resonant capacitor C in the half-bridge circuit 1110a to... r Discharge. Specifically, controller 114 does not discharge to the main power transistor Q. L Send the first control signal G L This makes the main power transistor Q L Turn off. Furthermore, controller 114 periodically sends signals to the auxiliary power transistor Q. H Send the second control signal G H This makes the auxiliary power transistor Q H It conducts periodically. The auxiliary power transistor Q of the half-bridge circuit 1110a... H When the circuit is turned on, the resonant capacitance C of the primary winding 1111a and the half-bridge circuit 1110a is... r The auxiliary power transistor Q of the half-bridge circuit 1110a H This can form a discharge circuit. Correspondingly, the auxiliary power transistor Q of the half-bridge circuit 1110a... H Periodic switching on allows the resonant capacitor C in the half-bridge circuit 1110a to... r Discharges periodically.

[0198] In this embodiment, controller 114 controls auxiliary power transistor Q. H The periodic conduction period T1 can be pre-configured or determined by the controller 114 based on the current resonant capacitance C. r capacitor voltage V Cr Or it can be calculated from stored electrical energy. In one embodiment, the resonant capacitor C... r capacitor voltage V Cr When the voltage value is high or the stored energy is large, the period T1 can be set to be smaller. In one embodiment, the period T1 can also be the same as the period of the control signals G1, G2, G3... or G4, G5, G6... In the embodiments of this application, in each period, the controller 114 controls the auxiliary power transistor Q. H The duration of conduction or deactivation can be the same or different.

[0199] Figure 16 This is a schematic diagram illustrating the change in the capacitor voltage of the resonant capacitor in the AHB converter circuit provided in this application. Figure 17 As shown, the resonant capacitor C r Periodic discharge, resonant capacitance C r capacitor voltage V Cr From V Cr2 The resonant capacitance C decreases in a stepwise manner. Between time t3 and t4, the resonant capacitance C... r capacitor voltage V Cr With the auxiliary power transistor Q H The periodic conduction exhibits a step-like decrease. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 also exhibits a step-like increase, and the output voltage V5 of the power supply circuit 113 also exhibits a step-like increase.

[0200] Therefore, controller 114 controls the resonant capacitor C in AHB converter circuit 111a. r Periodic discharge can cause the resonant capacitance C to... r capacitor voltage V Cr The stepped descent avoids excessively rapid drops that could affect the operation of the AHB converter circuit 111a, thereby improving the stability of the power supply module 11. Furthermore, the controller 114 controls the resonant capacitor C in the AHB converter circuit 111a. r Periodic discharge allows the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113 to be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid voltage increases, thereby improving the stability of the power supply module 11.

[0201] Figure 17 This is a schematic diagram of another embodiment of the controller provided in this application controlling the discharge of the resonant capacitor of the AHB converter circuit.Figure 15 and Figure 16 The difference lies in the fact that the controller 114 controls the auxiliary power transistor Q in the primary winding circuit 1111a of the AHB converter circuit 111a. H and main power transistor Q L The periodic alternation of conduction causes the resonant capacitor C to... r Discharges periodically.

[0202] At time t3, controller 114 periodically controls the main power transistor Q. L and auxiliary power transistor Q H Alternate conduction, and control of auxiliary power transistor Q H and main power transistor Q L They do not conduct simultaneously. Specifically, the controller 114 periodically sends signals to the auxiliary power transistor Q in sequence. H Send the second control signal G H , to the main power transistor Q L The first control signal G sent L This makes the auxiliary power transistor Q H and main power transistor Q L They are turned on sequentially, and the auxiliary power transistor Q... H and main power transistor Q L They do not conduct simultaneously. The auxiliary power transistor Q of the half-bridge circuit 1110a... H When the circuit is turned on, the resonant capacitance C of the primary winding 1111a and the half-bridge circuit 1110a is... r The auxiliary power transistor Q of the half-bridge circuit 1110a H A discharge circuit can be formed. Resonant capacitor C r capacitor voltage V Cr The changes can be referenced. Figure 18 As shown.

[0203] In one embodiment, controller 114 controls auxiliary power transistor Q in each cycle. H Pilot-on, main power transistor Q L After conduction.

[0204] First, controller 114 controls auxiliary power transistor Q. H On, main power transistor Q L Cut-off. Specifically, controller 114 sends a signal to auxiliary power transistor Q. H Send the second control signal G H And not to the main power transistor Q L Send the first control signal G L Accordingly, the resonant capacitor C r Primary winding a and auxiliary power transistor Q H A current loop is formed, and the resonant capacitor C rDischarge. Accordingly, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases.

[0205] Then, controller 114 controls auxiliary power transistor Q. H Cut-off, main power transistor Q L On. Specifically, controller 114 does not supply power to the auxiliary power transistor Q. H Send the second control signal G H And to the main power transistor Q L Send the first control signal G L At this time, the input voltage V1, the primary winding a, and the main power transistor Q... L A circuit is formed. Correspondingly, the input voltage V1 generates a primary winding voltage V on both sides of the primary winding a. 11 Primary winding voltage V 11 Through coupling via transformer 1112a, an auxiliary winding voltage V3 is generated on the auxiliary winding c. Accordingly, the output voltage V4 of the auxiliary winding circuit 112 is increased, and the output voltage V5 of the power supply circuit 113 is increased.

[0206] Therefore, controller 114 controls the resonant capacitance C of the primary winding circuit 1111a in the AHB converter circuit 111a. r Periodic discharge can cause the resonant capacitance C to... r capacitor voltage V Cr The stepped descent avoids excessively rapid drops that could affect the operation of the AHB converter circuit 111a, thereby improving the stability of the power module 111. Furthermore, the controller 114 controls the resonant capacitor C of the primary winding circuit 1111a in the AHB converter circuit 111a. r Periodic discharge allows the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113 to be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid increases, thereby improving the stability of the power supply module 111.

[0207] In one embodiment, the controller 114 can control the main power transistor Q in each cycle. L Pilot-on, auxiliary power transistor Q H After conduction. In this embodiment, controller 114 controls the main power transistor Q. L and auxiliary power transistor Q H The periodic alternation of conduction period T2 can be pre-configured, or it can be determined by controller 114 based on the current resonant capacitance C. r capacitor voltage V Cr Or it can be calculated from stored electrical energy. In one embodiment, the resonant capacitor C... r capacitor voltage V CrWhen the voltage value is high or the stored energy is large, the period T2 can be set to be smaller. In one embodiment, the period T2 can be the same as the period of control signals G1, G2, G3... or the period of G4, G5, G6... In the embodiments of this application, the controller 114 controls the main power transistor Q in each period. L The duration of conduction and the control of the auxiliary power transistor Q H The conduction duration can be the same or different. In this embodiment, the controller 114 sends a first control signal G. L Second control signal G H The duty cycles can be the same or different.

[0208] Figure 18 This is a schematic diagram of the half-bridge circuit in another AHB converter circuit provided in this application. Figure 18 As shown, the half-bridge circuit 1110a1 includes the main power transistor Q. L Auxiliary power transistor Q H and resonant capacitor C r Main power transistor Q L The source terminal is connected to the opposite terminal of the primary winding 1111a and the auxiliary power transistor Q. H The drain of the auxiliary power transistor Q. H The source-connected resonant capacitor C r The first terminal is grounded. Resonant capacitor C r The second end is connected to the same-named end of the primary winding 1111a. For example... Figure 12 The half-bridge circuit 1110a1 shown can be replaced Figure 19 The half-bridge circuit 1110a in the middle has the same function and control logic as the half-bridge circuit 1110a.

[0209] Figure 19 This is a schematic diagram of the half-bridge circuit in another AHB converter circuit provided in this application. Figure 19 As shown, the half-bridge circuit 1110a2 includes the main power transistor Q. L Auxiliary power transistor Q H and resonant capacitor C r The primary winding 1111a is connected to the main power transistor Q at the same terminal. L Drain and resonant capacitor C r The first terminal. Resonant capacitor C r The second end is connected to the auxiliary power transistor Q. H The source of the main power transistor Q. L The source of the transistor is grounded. The auxiliary power transistor Q... H The drain is grounded. For example... Figure 12 The half-bridge circuit 1110a2 shown can be replaced Figure 20The half-bridge circuit 1110a and half-bridge circuit 1110a2 have the same functions and control logic as half-bridge circuit 1110a.

[0210] In the scenario where the load level L of the power module 11 drops, the controller 114 provided in this application embodiment only needs to control the main power transistor Q in the AHB conversion circuit 111a. L and auxiliary power transistor Q H The controller 114 provided in this application embodiment can not only improve the stability of the AHB conversion circuit 111a, power module 11, and electronic device 10 where it is located, but also has a simple configuration, making it more suitable for use in various products.

[0211] Figure 20 This is a schematic diagram of one embodiment of the power module provided in this application, as shown below. Figure 1 The power module 11 shown can be applied to, for example Figure 2 or Figure 20 In the electronic device 10 shown. For example... Figure 21 As shown, the power module 11 includes an ACF conversion circuit 111b, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114.

[0212] The ACF converter circuit 111b receives the input voltage V1 from the input power supply 13 and provides an output voltage V2 to power the load 12. Additionally, the ACF converter circuit 111b supplies power to the power supply circuit 113 of the controller 114 via the auxiliary winding circuit 112. The auxiliary winding circuit 112 is coupled to the ACF converter circuit 111b, and an auxiliary winding voltage V3 is generated on the auxiliary winding 1121. The auxiliary winding circuit 112 converts the auxiliary winding voltage V3 into an output voltage V4 to power the power supply circuit 113. The power supply circuit 113 then powers the control circuit 114. The controller 114 controls the operating state of the ACF converter circuit 111b.

[0213] Figure 21 This is a schematic diagram of one embodiment of the power module provided in this application. Figure 21 As shown, the power module 11 includes an ACF converter circuit 111b, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The ACF converter circuit 111b in the power module 11 includes a half-bridge circuit 1110b, a transformer 1112b, and a rectifier circuit 1114b. The transformer 1112b includes a primary winding 1111b and a secondary winding 1113b. Additionally, the transformer 1112b also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113b is coupled to the primary winding 1111b, and the auxiliary winding 1121 is coupled to the primary winding 1111b.

[0214] The half-bridge circuit 1110b receives the input voltage V1 provided by the input power supply 13 and provides the output voltage V to the primary winding 1111b according to the control signal of the controller 114. 10 A typical half-bridge circuit 1110b includes a main power transistor, an auxiliary power transistor, and a clamping capacitor.

[0215] The primary winding 1111b of transformer 1112b is used to receive the output voltage V of half-bridge circuit 1110b. 10 And generate primary winding voltage V 11 The secondary winding 1113b of transformer 1112b is coupled to the primary winding 1111b of transformer 1112b, and a secondary winding voltage V3 is generated on the secondary winding 1113b.

[0216] The rectifier circuit 1114b is used to receive the secondary winding voltage V3 on the secondary winding 1113b and convert it into the output voltage V2.

[0217] The auxiliary winding circuit 112 supplies power to the power supply circuit 113. The auxiliary winding 1121 of the auxiliary winding circuit 112 is coupled to the primary winding 1111b of the transformer 1112b. The primary winding voltage V on the primary winding 1112b is... 11 After coupling, an auxiliary winding voltage V3 is generated on the auxiliary winding 1121. The auxiliary winding voltage V3 is then processed by the auxiliary winding circuit 112 and provides an output voltage V4 to the power supply circuit 113. The auxiliary winding circuit 112 may include the auxiliary winding 1121 and a rectifier module 1122.

[0218] Power supply circuit 113 supplies power to controller 114. Power supply circuit 113 receives the output voltage V4 from auxiliary winding circuit 112 and provides output voltage V5 to controller 114. That is, ACF converter circuit 111b supplies power to power supply circuit 113 of controller 114 via auxiliary winding circuit 112, which is coupled to the primary winding 1111 of its transformer 1112b. In some embodiments, power supply circuit 113 includes a voltage regulator circuit.

[0219] Controller 114 is used to control the operating status of ACF conversion circuit 111b. Controller 114 is also used to detect the output voltage V2 of ACF conversion circuit 111b, the output voltage V4 of auxiliary winding circuit 112, the output voltage V5 of power supply circuit 113, or the clamping capacitor C in half-bridge circuit 1110b. c capacitor voltage V Cc The controller 114 is also used to control the operating state of the ACF conversion circuit 111b based on the changes in one or more of the aforementioned voltage values.

[0220] In one embodiment, control 114 sends a control signal G to control the operating state of the half-bridge circuit 1110b in the ACF converter circuit 111b, thereby controlling the operating state of the ACF converter circuit 111b. For example, the operating states of the ACF converter circuit 111b typically include a continuous operating state and a paused operating state. The continuous operating state can also be called the normal operating state, the controller's normal waveform generation state, etc. The paused operating state can also be called the intermittent operating state, the BURST operating state, the controller's intermittent waveform generation state, etc.

[0221] In this embodiment, the controller 114 can send a control signal G to control the on and off of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110b. By adjusting the frequency or duty cycle of the control signal G, the controller 114 can control the conduction frequency or conduction duration of the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110b, thereby correspondingly adjusting the output voltage V of the half-bridge circuit 1110b. 10 The output voltage V of the half-bridge circuit 1110b 10 This will cause the primary winding voltage V 11 Change. Correspondingly, the primary winding voltage V... 11 Changes can lead to changes in the secondary winding voltage V. 12 And the auxiliary winding voltage V3 changes. Correspondingly, the secondary winding voltage V 12 The change in voltage V3 can cause a change in the output voltage V2 of the ACF converter circuit 111b. Correspondingly, a change in the auxiliary winding voltage V3 can cause a change in the output voltage V4 of the auxiliary winding circuit 112. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 can cause a change in the output voltage V5 of the power supply circuit 113.

[0222] like Figure 21 As shown in direction F1, the ACF converter circuit 111b can provide an output voltage V2 to power the load 12. The input voltage V1 is converted into the output voltage V2 through the half-bridge circuit 1110b, primary winding 1111b, secondary winding 1113b and rectifier circuit 1114b in the ACF converter circuit 111b.

[0223] like Figure 22 As shown in direction F2, the ACF converter circuit 111b can supply power to the power supply circuit 113 of the controller 114 through the auxiliary winding circuit 112. Specifically, the input voltage V1, after being processed by the half-bridge circuit 1110b in the ACF converter circuit 111b, can generate a primary winding voltage V0 in the primary winding 1111b. 11 Correspondingly, the primary winding voltage V 11An auxiliary winding voltage V3 can be generated on the auxiliary winding 1121 of the transformer 1112b. After being processed by the auxiliary winding circuit 1121, the auxiliary winding voltage V3 provides an output voltage V4 to power the power supply circuit 113 of the controller 114.

[0224] Figure 22 A schematic diagram of the voltage waveform of the controller and its power module provided in this application under a scenario where the load level drops. The following section combines... Figure 21 and Figure 21 This application details the operation of the controller 114 and its power module 11 in a scenario where the load level L of the load 12 drops.

[0225] Before time t1, the load level L of load 12 is the normal load L1. Controller 114 controls the ACF converter circuit 111b to operate in continuous operation, and controller 114 controls the output voltage V2 of the ACF converter circuit 111b to be the rated output voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 has a value of V. 40 The output voltage V5 of power supply circuit 113 has a voltage value of V. 50 The clamping capacitor C in half-bridge circuit 1111b c capacitor voltage V Cc The voltage value is V Cc1 V Cc1 The clamping capacitor C is used when the ACF converter circuit 111b is operating in continuous operation. c The capacitor voltage.

[0226] At time t1, the load level of load 12 drops from normal load L1 to light load L2. Correspondingly, after time t1, the output voltage V2 of the ACF converter circuit 111b increases to a value greater than the rated output voltage V. 20 .

[0227] In one embodiment, when the output voltage V2 of the ACF converter circuit 111b is greater than the rated output voltage V... 20 The controller 114 can control the ACF converter circuit 111b to operate in a continuous working state. Furthermore, the controller controls the ACF converter circuit 111b to reduce the output voltage V2. That is, the controller 114 adjusts the output voltage V2 of the ACF converter circuit 111b according to the voltage difference between the output voltage V2 and the rated output voltage V. 20Based on the comparison results, controller 114 controls the ACF converter circuit 111b to operate in a continuous working state, and controller 114 controls the ACF converter circuit 111b to reduce the output voltage V2. Specifically, controller 114 sends a control signal G to control the operating state of the main power transistor and auxiliary power transistor in the half-bridge circuit 1110b, so that the primary winding voltage V2 is reduced. 11 The voltage value decreases. In one embodiment, the controller 114 can reduce the transmission frequency of the control signal G, thereby reducing the conduction frequency of the main power transistor and the auxiliary power transistor. In one embodiment, the controller 114 can reduce the duty cycle of the control signal G, thereby reducing the conduction time of the main power transistor and the auxiliary power transistor. In another embodiment, when the output voltage V2 of the ACF converter circuit 111b is greater than the rated voltage V... 20 The controller 114 can control the ACF converter circuit 111b to operate in a suspended state, and can also reduce the output voltage V2. However, in both of the above embodiments, the output voltage V2 of the ACF converter circuit 111b may not be reduced effectively, and the output voltage V2 of the ACF converter circuit 111b will continue to increase after time t1.

[0228] Meanwhile, after time t1, the drop in load level L causes the output voltage V2 of the ACF converter circuit 111b to be higher than the rated voltage V. 20 Primary winding voltage V 11 The clamping capacitor C in the half-bridge circuit 1110b c Charging, clamping capacitor C in half-bridge circuit 1110b c capacitor voltage V Cc The voltage value from V Cc1 Upgrade to V Cc2 V Cc2 The clamping capacitor C in the half-bridge circuit 1110b c Maximum charging voltage.

[0229] At time t2, after time t1, the output voltage V2 of the ACF converter circuit 111b increases to the first preset value V. 21 The controller 114 determines that the output voltage V2 of the ACF conversion circuit 111b is greater than or equal to a first preset value V. 21 The controller 114 controls the ACF conversion circuit 111b to stop working. That is, the controller 114 determines the voltage value of the output voltage V2 of the ACF conversion circuit 111b based on the first preset value V. 21 Based on the comparison results, controller 114 controls the ACF conversion circuit 111b to operate in a suspended state. Specifically, controller 114 controls both the main power transistor and the auxiliary power transistor in the half-bridge circuit 1110b to be turned off. In this embodiment, the first preset value V21 This can be the peak voltage of the ACF converter circuit 111b. The peak voltage of the ACF converter circuit 111b is greater than the rated voltage V. 20 And it is less than the overvoltage protection voltage of the ACF converter circuit 111b.

[0230] After time t2, controller 114 controls the ACF converter circuit 111b to operate in a suspended state. Correspondingly, the primary winding voltage V on the primary winding 1111b of the ACF converter circuit 111b... 11 The voltage value drops, thus causing the secondary winding voltage V to decrease. 12 The voltage drops, causing the auxiliary winding voltage V3 to drop. Accordingly, the output voltage V2 of the ACF converter circuit 111b decreases, the output voltage V4 of the auxiliary winding circuit 112 decreases, and the output voltage V5 of the power supply circuit 113 decreases.

[0231] At time t3, after time t2, the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to the second preset value V. 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At this time, controller 114 controls the clamping capacitor C in half-bridge circuit 1110b. c Discharge.

[0232] In one embodiment, controller 114 determines that the output voltage V4 of auxiliary winding circuit 112 is less than or equal to a second preset value V. 41 The controller 114 controls the clamping capacitor C in the half-bridge circuit 1110b. c Discharge. That is, the controller 114 discharges the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the second preset value V. 41 The comparison results control the clamping capacitor C in the half-bridge circuit 1110b. c Discharge.

[0233] In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is less than or equal to a third preset value V. 52 The controller 114 controls the clamping capacitor C in the half-bridge circuit 1110b. c Discharge. That is, the controller 114 discharges the voltage value of the output voltage V5 of the power supply circuit 113 and the third preset value V. 52 Based on the comparison results, controller 114 controls the clamping capacitor C in half-bridge circuit 1110b. c Discharge.

[0234] In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110b to turn on, thereby enabling clamping capacitor C in half-bridge circuit 1110b to... c Discharge. Clamping capacitor C of primary winding 1111b and half-bridge circuit 1110b. c The auxiliary power transistor in the half-bridge circuit 1110b can form a discharge circuit. Correspondingly, the clamping capacitor C of the half-bridge circuit 1110b... c Discharge can generate a primary winding voltage V on the primary winding 1111b. 11 .

[0235] In one embodiment, the controller 114 controls the auxiliary power transistor in the half-bridge circuit 1110b to be periodically turned on, causing the clamping capacitor C in the half-bridge circuit 1110b to... c Discharge. When the auxiliary power transistor of the half-bridge circuit 1110b is turned on, the clamping capacitor C of the primary winding 1111b and the half-bridge circuit 1110b discharges. c The auxiliary power transistor in the half-bridge circuit 1110b can form a discharge circuit. Correspondingly, the periodic conduction of the auxiliary power transistor in the half-bridge circuit 1110b allows the clamping capacitor C in the half-bridge circuit 1110b to... c Discharges periodically.

[0236] After time t3, the clamping capacitor C in the half-bridge circuit 1110b c capacitor voltage V Cc The voltage value drops. The clamping capacitor C in the half-bridge circuit 1110b... c Discharge causes the primary winding voltage V on the primary winding 1111b to be reduced. 11 The voltage value increases. Correspondingly, the primary winding voltage V... 11 An increase in the voltage value of the auxiliary winding will cause an increase in the voltage value of the auxiliary winding voltage V3. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases. Therefore, in scenarios where the load level of the load 12 changes, the output voltage V5 of the power supply circuit 113 will not drop below the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection.

[0237] The controller 114 provided in this embodiment controls the clamping capacitor C in the half-bridge circuit 1110b of the ACF conversion circuit 111b. c Discharging allows the output voltage V5 of the power supply circuit 113 to be higher than the undervoltage protection voltage V of the controller 114. 51This prevents the controller 114 from restarting due to low voltage protection. Therefore, the controller 114 provided in this embodiment can improve the stability of the power module 11 and electronic device 10 in which it resides.

[0238] Because of the clamping capacitor C in the half-bridge circuit 1110b of the ACF converter circuit 111b c The stored energy is limited, and the primary winding voltage V generated on the primary winding 1111b after discharge is... 11 The voltage value is relatively small. At this time, the primary winding voltage V generated on the primary winding 1111b is... 11 Less than the secondary winding voltage V on the secondary winding 1113 12 This will not cause an increase in the output voltage V2 of the ACF converter circuit 111b. Therefore, the controller 114 controls the clamping capacitor C in the half-bridge circuit 1110b. c After discharge, the primary winding voltage V generated on the primary winding 1111b is 11 Used only to boost the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113, such as Figure 23 As shown in the F2 direction. Therefore, the controller 114 and the power module 111 in which it is located, provided in this application embodiment, can not only prevent the controller 114 from restarting due to undervoltage protection, but also avoid increasing the ripple of the output voltage V2 of the ACF conversion circuit 111b, thereby improving the stability of the controller 114, the power module 11 in which it is located, and the electronic device 10.

[0239] Furthermore, the controller 114 provided in this application embodiment controls the clamping capacitor C in the half-bridge circuit 1110b of the ACF conversion circuit 111b. c This avoids introducing noise from the input power supply 13, thus preventing noise from affecting the electromagnetic compatibility of the ACF conversion circuit 111b and its associated power supply module 11 and electronic device 10. Therefore, the controller 114 provided in this embodiment can improve the stability of its associated power supply module 11 and electronic device 10.

[0240] In one embodiment of this application, the clamping capacitor C is used in the half-bridge circuit 1110b of the ACF converter circuit 111b. c After the discharge begins, the controller 114 can also adjust the clamping capacitor C in the half-bridge circuit 1110b. c capacitor voltage V Cc The voltage value, the output voltage V4 of the auxiliary winding circuit 112, or the output voltage V5 of the power supply circuit 113 controls the clamping capacitor C in the half-bridge circuit 1110b. c Discharge is stopped. In one embodiment, controller 114 controls the auxiliary power transistor in half-bridge circuit 1110b to turn off, and the clamping capacitor C of primary winding 1111b and half-bridge circuit 1110b is also turned off.c The discharge circuit formed by the auxiliary power transistor of the half-bridge circuit 1110b is broken. Correspondingly, the clamping capacitor C of the half-bridge circuit 1110b... c Stop discharging.

[0241] In the first embodiment, at time t4 after time t3, the clamping capacitor C of the half-bridge circuit 1110b c capacitor voltage V Cc The voltage drops to less than or equal to the preset capacitor voltage value V. Cc3 In one embodiment, controller 114 determines the clamping capacitor C of half-bridge circuit 1110b. c capacitor voltage V Cc The voltage drops to less than or equal to the preset capacitor voltage value V. Cc3 The controller 114 controls the clamping capacitor C of the half-bridge circuit 1110b. c Stop discharging. In one embodiment, a preset capacitor voltage value V is established. Cc3 The clamping capacitor C of the half-bridge circuit 1110b when the ACF converter circuit 111b is operating in continuous operation can be greater than or equal to that of the ACF converter circuit 111b. c The voltage value V of the capacitor voltage Cc1 That is, the controller 114 determines the clamping capacitor C of the half-bridge circuit 1110b. c capacitor voltage V Cc With the preset capacitor voltage value V Cc3 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. c Discharge stops. Therefore, controller 114 can stop the discharge through the clamping capacitor C of half-bridge circuit 1110b. c Stopping the discharge can prevent the clamping capacitor C from being clamped. c capacitor voltage V Cc The low temperature affects the ACF conversion circuit 111b's ability to resume continuous operation, further improving the stability of the power supply module 11 and the electronic device 10 it is located in.

[0242] In the second embodiment, at time t4 after time t3, the output voltage V4 of the auxiliary winding circuit 112 is increased to be greater than or equal to a fourth preset value V. 42 In one embodiment, the controller 114 determines that the output voltage V4 of the auxiliary winding circuit 112 is greater than or equal to a fourth preset value V. 42 The controller 114 controls the clamping capacitor C of the half-bridge circuit 1110b. c Stop discharging. That is, the controller 114 stops discharging based on the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the fourth preset value V. 42 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. cDischarge stops. Therefore, controller 114 can stop the discharge through the clamping capacitor C of half-bridge circuit 1110b. c Stopping the discharge can prevent the output voltage V4 of the auxiliary winding circuit 112 from becoming too high and damaging the power supply circuit 113 and the controller 114, further improving the stability of the controller 114 and the power supply module 11 and electronic equipment 10 in which it is located.

[0243] In the third embodiment, at time t4 after time t3, the output voltage V5 of the power supply circuit 113 is increased to be greater than or equal to the fifth preset value V. 53 In one embodiment, the controller 114 determines that the output voltage V5 of the power supply circuit 113 is greater than or equal to a fifth preset value V. 53 The controller 114 controls the clamping capacitor C of the half-bridge circuit 1110b. c Stop discharging. That is, the controller 114 determines the voltage value of the output voltage V5 of the power supply circuit 113 and the fifth preset value V. 53 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. c Discharge stops. Therefore, controller 114 can control the clamping capacitor C of half-bridge circuit 1110b. c Stop discharging to prevent the output voltage V4 of the power supply circuit 113 from becoming too high and damaging the controller 114, thereby further improving the stability of the controller 114 and its power supply module 11 and electronic equipment 10.

[0244] After time t4, the clamping capacitor C of the half-bridge circuit 1110b... c After the discharge stops, the clamping capacitor C c capacitor voltage V Cc The voltage value stops decreasing. Correspondingly, the primary winding voltage V... 11 The voltage value of the auxiliary winding circuit 112 decreases, causing the voltage value of the auxiliary winding circuit 113 to decrease. Consequently, the voltage value of the output voltage V4 of the auxiliary winding circuit 112 decreases, and the voltage value of the output voltage V5 of the power supply circuit 113 decreases.

[0245] In one embodiment of this application, after time t4, when the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to a second preset value V 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At this time, controller 114 can control the clamping capacitor C of half-bridge circuit 1110b. c Discharge again. The specific process is as described in the above embodiments and will not be repeated. That is, the controller 114 can adjust the voltage value of the output voltage V4 of the auxiliary winding circuit 112 according to the second preset value V. 41The comparison results control the clamping capacitor C of the half-bridge circuit 1110b. c Discharge again. Alternatively, controller 114 can adjust the output voltage V5 of power supply circuit 113 based on the voltage value and a third preset value V. 52 The comparison results control the clamping capacitor C of the half-bridge circuit 1110b. c Discharge again.

[0246] In one embodiment of this application, the clamping capacitor C in the half-bridge circuit 1110b c After discharge begins or stops, the controller 114 will also control the operation state of the ACF converter circuit 111b from a paused state to a continuous operating state based on the voltage value of the output voltage V2 of the ACF converter circuit 111b. After time t2, the controller 114 controls the ACF converter circuit 111b to operate in the paused state, and correspondingly, the voltage value of the output voltage V2 of the ACF converter circuit 111b decreases. In one embodiment, the clamping capacitor C of the half-bridge circuit 1110b... c After discharge begins and before discharge stops, the output voltage V2 of the ACF converter circuit 111b drops to a value less than or equal to the rated voltage V. 20 The controller 114 controls the ACF conversion circuit 111b to switch its operating state from a paused state to a continuous operating state. In one embodiment, the clamping capacitor C of the half-bridge circuit 1110b... c After the discharge stops, the output voltage V2 of the ACF converter circuit 111b drops to less than or equal to the rated voltage V. 20 The controller 114 controls the ACF conversion circuit 111b to switch its operating state from a paused working state to a continuous working state.

[0247] At time t5, after time t3, the output voltage V2 of the ACF converter circuit 111b drops to less than or equal to the rated voltage V. 20 The controller 114 determines when the output voltage V2 of the ACF conversion circuit 111b drops to less than or equal to the rated voltage V. 20 The controller 114 switches the operating state of the ACF converter circuit 111b from a paused operating state to a continuous operating state. Specifically, the controller 114 adjusts the voltage value of the output voltage V2 of the ACF converter circuit 111b according to the voltage ratio of the rated voltage V. 20 Based on the comparison results, the operating state of the ACF converter circuit 111b is switched from the paused operating state to the continuous operating state. After time t5, the output voltage V2 of the ACF converter circuit 111b recovers to the rated voltage V. 20 The output voltage V4 of the auxiliary winding circuit 112 is restored to V. 40 The output voltage V5 of power supply circuit 113 returns to V.50 .

[0248] Figure 23 This is a schematic diagram of one embodiment of the power module provided in this application. Figure 21 It shows Figure 23 A schematic diagram of part of the circuitry in the power supply module 11 is shown. (See diagram below.) Figure 23 As shown, the power module 11 includes an ACF converter circuit 111b, an auxiliary winding circuit 112, a power supply circuit 113, and a controller 114. The ACF converter circuit 111b includes a half-bridge circuit 1110b, a transformer 1112b, and a rectifier circuit 1114b. The transformer 1112b includes a primary winding 1111b and a secondary winding 1113b. Additionally, the transformer 1112b also includes an auxiliary winding 1121 in the auxiliary winding circuit 112. The secondary winding 1113b is coupled to the primary winding 1111b, and the auxiliary winding 1121 is coupled to the primary winding 1111b.

[0249] The half-bridge circuit 1110b includes the main power transistor Q. L Auxiliary power transistor Q H and clamping capacitor C c Main power transistor Q L Auxiliary power transistor Q H and clamping capacitor C c This forms an active clamped flyback half-bridge topology. Specifically, the clamping capacitor C... c The first terminal is connected to the opposite terminal of the primary winding 1111b, and the clamping capacitor C c The second end is connected to the auxiliary power transistor Q. H The drain of the auxiliary power transistor Q. H The source terminal is connected to the same terminal of the primary winding 1111b and the main power transistor Q. L The drain of the main power transistor Q. L The source of the transistor is grounded. In one embodiment, the main power transistor Q... L The gate is used to receive the second control signal G from the controller 114. H Auxiliary power transistor Q H The gate is used to receive the first control signal G from the controller 114. L .

[0250] The rectifier circuit 1114b includes a capacitor C1 and a diode D2. The anode of the diode D2 is connected to the same-name terminal of the secondary winding 1113b. The two ends of the capacitor C1 are connected to the cathode of the diode D2 and the opposite-name terminal of the secondary winding 1113b, respectively.

[0251] The auxiliary winding circuit 112 includes an auxiliary winding 1121 and a rectifier module 1122. The rectifier module 1122 may include a diode D1. The anode of the diode D1 is connected to the same-name terminal of the auxiliary winding 1121, and the cathode of the diode D1 and the opposite-name terminal of the auxiliary winding 1121 are connected to the power supply circuit 113.

[0252] The power supply circuit 113 may include a boost circuit. In one embodiment, the power supply circuit 113 may also be a buck circuit, a buck-boost circuit, etc. In one embodiment, the power supply circuit 113 may also be a low dropout regulator (LDO) or other voltage regulator circuit.

[0253] The controller 114 includes a detection unit 1141 and a driving unit 1142. In some embodiments, when the driving unit 1142 is a chip, the power supply circuit 113 can be connected to the power supply pin of the driving unit 1142. For example, the power supply pin can be... Figure 23 The label shown is "V" dd The pin of "".

[0254] The detection unit 1141 is used to detect the output voltage V2 of the ACF converter circuit 111b, the output voltage V4 of the auxiliary winding circuit 112, the output voltage V5 of the power supply circuit 113, or the clamping capacitor C in the half-bridge circuit 1110b of the ACF converter circuit 111b. c capacitor voltage V Cc The voltage values ​​vary among multiple voltage values. The drive circuit 1142 is used to control the operating state of the ACF conversion circuit 111b according to the changes in one or more of the above voltage values.

[0255] For example, the detection unit 1141 can be connected Figure 23 Point A at the output terminal of the secondary winding circuit 1114b detects the voltage value of the output voltage V2 of the ACF conversion circuit 111b. The detection unit 1141 can be connected via... Figure 23 Point B at the output terminal of the auxiliary winding circuit 112 is used to detect the voltage value of the output voltage V4 of the auxiliary winding circuit 112. The detection unit 1141 can be connected via... Figure 23 Point C at the output terminal of the power supply circuit 113 is used to detect the output voltage V5 of the power supply circuit 113. The detection unit 1141 can be connected via... Figure 23 Mid-clamp capacitor C c At point D on either side, detect the clamping capacitor C. c capacitor voltage V Cc The voltage value.

[0256] The drive unit 1142 is used to control the operating state of the ACF conversion circuit 111b. Specifically, the drive unit 1142 sends a control signal G. L / G H Control main power transistor Q L and auxiliary power transistor Q H The on and off states of the ACF conversion circuit 111b are controlled by the switching on and off of the drive unit 1142. In some embodiments, when the drive unit 1142 is a chip, Figure 23 The drive unit 1142 shown can be driven by its label "G" H The pin sends a control signal G. H It can be accessed through its label "G" L The pin sends a control signal G. L It should be noted that, Figure 23 The pin labels are for illustrative purposes only; in practical applications, other pin labels of the driver unit 1142 can also be used. Figure 24 The pins shown in the diagram have functions.

[0257] The drive unit 1142 sends power to the main power transistor Q. L Send the first control signal G L Method of controlling the main power transistor Q L Turning the circuit on or off. The drive unit 1142 controls the auxiliary power transistor Q by... H Send the second control signal G H Method of controlling auxiliary power transistor Q H To turn on or off. In this embodiment, the controller 114 sends a first control signal G. L Second control signal G H This can be implemented using high-level signals or low-level signals. In one embodiment, the main power transistor Q... L According to the first control signal G L Turn on, auxiliary power transistor Q H According to the second control signal G H Turn-on. In one embodiment, the main power transistor Q is turned on. L According to the first control signal G L Turn off, auxiliary power transistor Q H According to the second control signal G H Turn off.

[0258] Figure 22 This is a schematic diagram of the control signals provided by the controller in this application in a scenario where the load level of the power module drops. The following is in conjunction with... Figure 23 , Figure 24 and Figure 25 This describes the operation of the controller 114 and its power module 11 provided in this application in a scenario where the load level L of the load 12 drops.

[0259] Before time t1, the load level of load 12 is the normal load L1. Controller 114 controls the ACF converter circuit 111b to operate in continuous operation and controls the output voltage V2 of the ACF converter circuit 111b to be the rated voltage V. 20 At this time, the output voltage V4 of the auxiliary winding circuit 112 is V. 40 The output voltage V5 of power supply circuit 113 has a voltage value of V. 50 The clamping capacitor C in half-bridge circuit 1111b c capacitor voltage V Cc The voltage value is V Cc1 .

[0260] Figure 25 This is a schematic diagram of the control signals of the controller provided in an embodiment of this application. Figure 24 As shown, each of the control signals G1, G2, G3... sent by controller 114 includes a signal to the main power transistor Q. L The first control signal G sent L Or to the auxiliary power transistor Q H The second control signal G sent H Controller 114 controls the main power transistor Q. L and auxiliary power transistor Q H By periodically switching on and off, the half-bridge circuit 1110b can generate a primary winding voltage V in the primary winding 1111b. 11 The primary winding voltage V on the primary winding 1111b 11 Through coupling, a secondary winding voltage V can be generated on the secondary winding 1113b. 12 And an auxiliary winding voltage V3 can be generated on the auxiliary winding 1121. Accordingly, the rectifier circuit 1114b provides an output voltage V2 to the load 12, the auxiliary winding circuit 112 provides an output voltage V4 to the power supply circuit 113, and the power supply circuit 113 provides an output voltage V5 to the controller 115. 50 Because the output voltage V2 of the ACF converter circuit 111b to the load 12 is stable at the rated voltage V... 20 In the half-bridge circuit 1110b, the clamping capacitor C c voltage value V Cc Stable at V Cc1 .

[0261] At time t1, the load level of load 12 drops from normal load L1 to light load L2. After time t1, the output voltage V2 of the ACF converter circuit 111b increases to a value greater than the rated voltage V. 20 .

[0262] In one embodiment, the controller 114 determines the voltage value of the output voltage V2 of the ACF converter circuit 111b and the rated voltage V. 20 Based on the comparison results, the ACF conversion circuit 111b is controlled to operate in a continuous working state, and the controller 114 controls the ACF conversion circuit 111b to reduce the output voltage V2.

[0263] Specifically, the detection unit 1141 of the controller 114 detects the output voltage V2 of the ACF conversion circuit 111b and determines that the output voltage V2 of the ACF conversion circuit 111b is greater than the rated voltage V. 20 Accordingly, controller 114 controls the ACF conversion circuit 111b to operate in a continuous working state, and controller 114 reduces the first control signal G. L Second control signal G H The transmission frequency, or the first control signal G is reduced. L Second control signal G H Duty cycle. For example... Figure 25 As shown, the frequencies of control signals G4, G5, and G6 sent by controller 114 after time t1 are less than the frequencies of control signals G1, G2, and G3 periodically sent before time t1. Correspondingly, the main power transistor Q... L and auxiliary power transistor Q H The reduced frequency of switching on and off causes a decrease in the output voltage V2 of the ACF converter circuit 111b. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 decreases, and the output voltage V5 of the power supply circuit 113 decreases. However, this method may not effectively reduce the output voltage V2 of the ACF converter circuit 111b, and the output voltage V2 of the ACF converter circuit 111b will continue to increase.

[0264] After time t1, the output voltage V2 of the ACF converter circuit 111b is higher than the rated voltage V. 20 At this time, the primary winding voltage V 11 The clamping capacitor C in the half-bridge circuit 1110b c Charging, clamping capacitor C in half-bridge circuit 1110b c capacitor voltage V Cc The voltage value from V Cc1 Upgrade to V Cc2 .

[0265] At time t2, after time t1, the output voltage V2 of the ACF converter circuit 111b increases to a value greater than or equal to the first preset value V. 21 The controller 114 determines the voltage value of the output voltage V2 of the ACF conversion circuit 111b and the first preset value V. 21Based on the comparison results, controller 114 controls the ACF converter circuit 111b to operate in a suspended state. Specifically, the detection unit 1141 of controller 114 detects the voltage value of the output voltage V2 of the ACF converter circuit 111b and determines that the voltage value of the output voltage V2 of the ACF converter circuit 111b is greater than or equal to a first preset value V. 21 Accordingly, the drive unit 1142 of the controller 114 stops sending the first control signal G. L Second control signal G H This controls the ACF converter circuit 111b to operate in a suspended state. Accordingly, the ACF converter circuit 111b will not process the input voltage V1 it receives, and the output voltage V2 of the ACF converter circuit 111b will decrease.

[0266] After time t2, controller 114 controls the ACF converter circuit 111b to operate in a suspended state. Correspondingly, the primary winding voltage V on the primary winding 1111b of the ACF converter circuit 111b... 11 The voltage value drops, thus causing the secondary winding voltage V to decrease. 12 The voltage drops, causing the auxiliary winding voltage V3 to drop. Accordingly, the output voltage V2 of the ACF converter circuit 111b decreases, the output voltage V4 of the auxiliary winding circuit 112 decreases, and the output voltage V5 of the power supply circuit 113 decreases.

[0267] At time t3, after time t2, the output voltage V4 of the auxiliary winding circuit 112 drops below the second preset value V. 41 Or the output voltage V5 of the power supply circuit 113 drops below the third preset value V 52 At this time, controller 114 controls the clamping capacitor C in half-bridge circuit 1110b. c Discharge.

[0268] In one embodiment, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and determines that the voltage value of the output voltage V4 of the auxiliary winding circuit 112 is less than or equal to a second preset value V. 41 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H The circuit is turned on. At this time, the clamping capacitor C of the half-bridge circuit 1110b is activated. c The power transistor Q of the primary winding 1111b and the half-bridge circuit 1110b H To form a discharge circuit, the clamping capacitor C of the half-bridge circuit 1110b c Discharge begins.

[0269] In one embodiment, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V5 of the power supply circuit 113 and determines that the voltage value of the output voltage V5 of the power supply circuit 113 is less than or equal to a third preset value V. 52 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H The circuit is turned on. At this time, the clamping capacitor C of the half-bridge circuit 1110b is activated. c The power transistor Q of the primary winding 1111b and the half-bridge circuit 1110b H To form a discharge circuit, the clamping capacitor C of the half-bridge circuit 1110b c Discharge begins.

[0270] After time t3, the clamping capacitor C in the half-bridge circuit 1110b c capacitor voltage V Cc The voltage value drops. The clamping capacitor C in the half-bridge circuit 1110b... c Discharge causes the primary winding voltage V on the primary winding 1111b to be reduced. 11 The voltage value increases. Correspondingly, the auxiliary winding voltage V3 increases, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases. Therefore, in scenarios where the load level of load 12 changes, the output voltage V5 of the power supply circuit 113 will not drop below the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection.

[0271] The controller 114 provided in this embodiment controls the clamping capacitor C in the half-bridge circuit 1110b of the ACF conversion circuit 111b. c Discharging allows the output voltage V5 of the power supply circuit 113 to be higher than the undervoltage protection voltage V of the controller 114. 51 This prevents the controller 114 from restarting due to low voltage protection. Therefore, the controller 114 provided in this embodiment can improve the stability of the power module 11 and electronic device 10 in which it resides.

[0272] Because of the clamping capacitor C in the half-bridge circuit 1110b of the ACF converter circuit 111b c The stored energy is limited, and the primary winding voltage V generated on the primary winding 1111b after discharge is... 11 The voltage value is relatively small. At this time, the primary winding voltage V generated on the primary winding 1111b is... 11 Less than the secondary winding voltage V on the secondary winding 1113 12This will not cause an increase in the output voltage V2 of the ACF converter circuit 111b. Therefore, the controller 114 controls the clamping capacitor C in the half-bridge circuit 1110b. c After discharge, the primary winding voltage V generated on the primary winding 1111b is 11 It is only used to boost the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113. Therefore, the controller 114 and the power supply module 111 provided in this application embodiment can not only prevent the controller 114 from restarting due to undervoltage protection, but also avoid increasing the ripple of the output voltage V2 of the ACF conversion circuit 111b, thereby improving the stability of the controller 114, the power supply module 11, and the electronic device 10.

[0273] Furthermore, the controller 114 provided in this application embodiment controls the clamping capacitor C in the half-bridge circuit 1110b of the ACF conversion circuit 111b. c This avoids introducing noise from the input power supply 13, thus preventing any impact on the electromagnetic compatibility of the ACF conversion circuit 111b and its associated power module 11 and electronic device 10. Therefore, the controller 114 provided in this embodiment can improve the stability of its associated power module 11 and electronic device 10.

[0274] In one embodiment of this application, the controller 114 can also control the clamping capacitor C in the half-bridge circuit 1110b of the ACF conversion circuit 111b. c Stop discharging.

[0275] In the first embodiment, at time t4 after time t3, the clamping capacitor C of the half-bridge circuit 1110b c capacitor voltage V Cc The voltage drops to less than or equal to the preset capacitor voltage value V. Cc3 In one embodiment, a preset capacitor voltage value V is provided. Cc3 The clamping capacitor C of the half-bridge circuit 1110b when the ACF converter circuit 111b is operating in continuous operation can be greater than or equal to that of the ACF converter circuit 111b. c The voltage value V of the capacitor voltage Cc The controller 114 uses the clamping capacitor C of the half-bridge circuit 1110b. c capacitor voltage V Cc With the preset capacitor voltage value V Cc3 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. c Discharge is stopped. Specifically, the detection unit 1141 of the controller 114 detects the clamping capacitor C of the half-bridge circuit 1110b. c capacitor voltage V Cc And determine the clamping capacitor C of half-bridge circuit 1110b. c capacitor voltage VCc Less than or equal to the preset capacitor voltage value V Cc3 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the clamping capacitor C of the half-bridge circuit 1110b... c The power transistor Q of the primary winding 1111b and the half-bridge circuit 1110b H The discharge circuit formed is broken, and the clamping capacitor C of the half-bridge circuit 1110b is disconnected. c Stop discharging.

[0276] Therefore, the controller 114 can use the clamping capacitor C of the half-bridge circuit 1110b. c Stopping the discharge can prevent the clamping capacitor C from being clamped. c capacitor voltage V Cc The low temperature affects the ACF conversion circuit 111b's ability to resume continuous operation, further improving the stability of the power supply module 11 and the electronic device 10 it is located in.

[0277] In the second embodiment, at time t4 after time t3, the output voltage V4 of the auxiliary winding circuit 112 is increased to be greater than or equal to a fourth preset value V. 42 The controller 114 determines the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and the fourth preset value V. 42 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. c Discharge is stopped. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V4 of the auxiliary winding circuit 112 and determines that the voltage value of the output voltage V4 of the auxiliary winding circuit 112 is less than or equal to the preset capacitor voltage value V. Cc3 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the clamping capacitor C of the half-bridge circuit 1110b... c The power transistor Q of the primary winding 1111b and the half-bridge circuit 1110b H The discharge circuit formed is broken, and the clamping capacitor C of the half-bridge circuit 1110b is disconnected. c Stop discharging.

[0278] Therefore, the controller 114 can use the clamping capacitor C of the half-bridge circuit 1110b. c Stopping the discharge can prevent the output voltage V4 of the auxiliary winding circuit 112 from becoming too high and damaging the power supply circuit 113 and the controller 114, further improving the stability of the controller 114 and the power supply module 11 and electronic equipment 10 in which it is located.

[0279] In the third embodiment, at time t4 after time t3, the output voltage V5 of the power supply circuit 113 is increased to be greater than or equal to the fifth preset value V. 53 The controller 114 determines the voltage value of the output voltage V5 of the power supply circuit 113 and the fifth preset value V. 53 The comparison results show that controller 114 controls the clamping capacitor C of half-bridge circuit 1110b. c Discharge is stopped. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V5 of the power supply circuit 113 and determines that the voltage value of the output voltage V5 of the power supply circuit 113 is greater than or equal to a fifth preset value V. 53 The drive unit 1142 of the controller 114 sends the first control signal G. L This makes the auxiliary power transistor Q H Turn off. At this time, the clamping capacitor C of the half-bridge circuit 1110b... c The power transistor Q of the primary winding 1111b and the half-bridge circuit 1110b H The discharge circuit formed is broken, and the clamping capacitor C of the half-bridge circuit 1110b is disconnected. c Discharge stops. Therefore, controller 114 can control the clamping capacitor C of half-bridge circuit 1110b. c Stop discharging to prevent the output voltage V4 of the power supply circuit 113 from becoming too high and damaging the controller 114, thereby further improving the stability of the controller 114 and its power supply module 11 and electronic equipment 10.

[0280] After time t4, the clamping capacitor C of the half-bridge circuit 1110b... c After the discharge stops, the clamping capacitor C c capacitor voltage V Cc The voltage value stops decreasing. Correspondingly, the primary winding voltage V... 11 The voltage value of the auxiliary winding circuit 112 decreases, causing the voltage value of the auxiliary winding circuit 113 to decrease. Consequently, the voltage value of the output voltage V4 of the auxiliary winding circuit 112 decreases, and the voltage value of the output voltage V5 of the power supply circuit 113 decreases.

[0281] In one embodiment of this application, after time t4, when the output voltage V4 of the auxiliary winding circuit 112 drops to less than or equal to a second preset value V 41 The output voltage V5 of the power supply circuit 113 drops to less than or equal to the third preset value V. 52 At this time, controller 114 can control the clamping capacitor C of half-bridge circuit 1110b. c Discharge again. The specific process is as described in the above embodiments and will not be repeated.

[0282] In one embodiment of this application, the clamping capacitor C in the half-bridge circuit 1110b c After discharge begins or stops, the controller 114 will also control the operation state of the ACF converter circuit 111b from a paused state to a continuous operating state based on the voltage value of the output voltage V2 of the ACF converter circuit 111b. After time t2, the controller 114 controls the ACF converter circuit 111b to operate in the paused state, and correspondingly, the voltage value of the output voltage V2 of the ACF converter circuit 111b decreases. In one embodiment, the clamping capacitor C of the half-bridge circuit 1110b... c After discharge begins and before discharge stops, the output voltage V2 of the ACF converter circuit 111b drops to a value less than or equal to the rated voltage V. 20 The controller 114 controls the ACF conversion circuit 111b to switch its operating state from a paused state to a continuous operating state. In one embodiment, the clamping capacitor C of the half-bridge circuit 1110b... c After the discharge stops, the output voltage V2 of the ACF converter circuit 111b drops to less than or equal to the rated voltage V. 20 The controller 114 controls the ACF conversion circuit 111b to switch its operating state from a paused working state to a continuous working state.

[0283] At time t5, after time t3, the output voltage V2 of the ACF converter circuit 111b drops to less than or equal to the rated output voltage V. 20 The controller 114 determines the voltage value of the output voltage V2 of the ACF conversion circuit 111b and the rated output voltage V. 20 Based on the comparison results, the operating state of the ACF converter circuit 111b is switched from a paused operating state to a continuous operating state. Specifically, the detection unit 1141 of the controller 114 detects the voltage value of the output voltage V2 of the ACF converter circuit 111b and determines whether the voltage value of the output voltage V2 of the ACF converter circuit 111b is less than or equal to the rated output voltage V. 20 The drive unit 1142 of the controller 114 periodically sends the first control signal G. L Second control signal G H Control the main power transistor Q L and auxiliary power transistor Q H Periodic switching on and off allows the ACF conversion circuit 111b to resume continuous operation. At this time, the controller 114 sends the first control signal G. L Second control signal G H These are denoted as G7, G8, G9… The specific implementation of each control signal G7, G8, G9… is as follows… Figure 26The same applies as shown, and will not be repeated. For example, the periods of control signals G7, G8, G9… can also be the same as the periods of control signals G1, G2, G3… or the same as the periods of G4, G5, G6… etc. After time t5, the output voltage V2 of the ACF converter circuit 111b returns to the rated output voltage V… 20 The output voltage V4 of the auxiliary winding circuit 112 is restored to V. 40 The output voltage V5 of power supply circuit 113 returns to V. 50 .

[0284] Figure 26 This is a schematic diagram of an embodiment of the controller provided in this application controlling the discharge of the clamping capacitor in the ACF conversion circuit. Figure 24 and Figure 22 The difference lies in the fact that the controller 114 controls the clamping capacitor C of the primary winding circuit 1111b in the ACF converter circuit 111b. c Periodic discharge. The following text combines... Figure 26 and Figure 27 To explain.

[0285] At time t3, controller 114 controls the auxiliary power transistor Q in half-bridge circuit 1110b. H The periodic conduction causes the clamping capacitor C in the half-bridge circuit 1110b to... c Discharge. Specifically, controller 114 does not discharge to the main power transistor Q. L Send the first control signal G L This makes the main power transistor Q L Turn off. Furthermore, controller 114 periodically sends signals to the auxiliary power transistor Q. H Send the second control signal G H This makes the auxiliary power transistor Q H It conducts periodically. The auxiliary power transistor Q of the half-bridge circuit 1110b... H When conducting, the clamping capacitor C of the primary winding 1111b and the half-bridge circuit 1110b c The auxiliary power transistor Q of the half-bridge circuit 1110b H This can form a discharge circuit. Correspondingly, the auxiliary power transistor Q of the half-bridge circuit 1110b... H Periodic switching on allows the clamping capacitor C in the half-bridge circuit 1110b to... c Discharges periodically.

[0286] In this embodiment, controller 114 controls auxiliary power transistor Q. H The periodic conduction period T1 can be pre-configured or determined by the controller 114 based on the current clamping capacitor C. c capacitor voltage V CcOr it can be calculated from stored electrical energy. In one embodiment, the clamping capacitor C... c capacitor voltage V Cc When the voltage value is high or the stored energy is large, the period T1 can be set to be smaller. In one embodiment, the period T1 can also be the same as the period of the control signals G1, G2, G3... or G4, G5, G6... In the embodiments of this application, in each period, the controller 114 controls the auxiliary power transistor Q. H The duration of conduction or deactivation can be the same or different.

[0287] Figure 27 This is a schematic diagram illustrating the change in the capacitor voltage of the clamping capacitor in the ACF converter circuit provided in this application. Figure 28 As shown, clamping capacitor C c Periodic discharge, clamping capacitor C c capacitor voltage V Cc From V Cc2 The temperature decreases in a stepwise manner. Between time t3 and time t4, the clamping capacitance C... c capacitor voltage V Cc With the auxiliary power transistor Q H The periodic conduction exhibits a step-like decrease. Correspondingly, the output voltage V4 of the auxiliary winding circuit 112 also exhibits a step-like increase, and the output voltage V5 of the power supply circuit 113 also exhibits a step-like increase.

[0288] Therefore, controller 114 controls the clamping capacitor C in ACF conversion circuit 111b. c Periodic discharge can make the clamping capacitor C c capacitor voltage V Cc The stepped descent avoids excessively rapid drops that could affect the operation of the ACF conversion circuit 111b, thereby improving the stability of the power module 11. Furthermore, the controller 114 controls the clamping capacitor C in the ACF conversion circuit 111b. c Periodic discharge allows the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113 to be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid voltage increases, thereby improving the stability of the power supply module 11.

[0289] Figure 28 This is a schematic diagram of another embodiment of the controller provided in this application controlling the discharge of the clamping capacitor in the ACF conversion circuit. Figure 26 and Figure 27 The difference lies in the fact that the controller 114 controls the auxiliary power transistor Q in the primary winding circuit 1111b of the ACF converter circuit 111b. H and main power transistor Q L The periodic alternating conduction causes the clamping capacitor C to... cDischarges periodically.

[0290] At time t3, controller 114 periodically controls the main power transistor Q. L and auxiliary power transistor Q H Alternate conduction, and control of auxiliary power transistor Q H and main power transistor Q L They do not conduct simultaneously. Specifically, the controller 114 periodically sends signals to the auxiliary power transistor Q in sequence. H Send the second control signal G H , to the main power transistor Q L The first control signal G sent L This makes the auxiliary power transistor Q H and main power transistor Q L They are turned on sequentially, and the auxiliary power transistor Q... H and main power transistor Q L They do not conduct simultaneously. The auxiliary power transistor Q of the half-bridge circuit 1110b... H When conducting, the clamping capacitor C of the primary winding 1111b and the half-bridge circuit 1110b c The auxiliary power transistor Q of the half-bridge circuit 1110b H A discharge circuit can be formed. Clamping capacitor C c capacitor voltage V Cc The changes can be referenced. ​ As shown.

[0291] In one embodiment, controller 114 controls auxiliary power transistor Q in each cycle. H Pilot-on, main power transistor Q L After conduction.

[0292] First, controller 114 controls auxiliary power transistor Q. H On, main power transistor Q L Cut-off. Specifically, controller 114 sends a signal to auxiliary power transistor Q. H Send the second control signal G H And not to the main power transistor Q L Send the first control signal G L Accordingly, the clamping capacitor C c Primary winding a and auxiliary power transistor Q H Forming a current loop, clamping capacitor C c Discharge. Accordingly, the output voltage V4 of the auxiliary winding circuit 112 increases, and the output voltage V5 of the power supply circuit 113 increases.

[0293] Then, controller 114 controls auxiliary power transistor Q. H Cut-off, main power transistor Q L On. Specifically, controller 114 does not supply power to the auxiliary power transistor Q.H Send the second control signal G H And to the main power transistor Q L Send the first control signal G L At this time, the input voltage V1, the primary winding a, and the main power transistor Q... L A circuit is formed. Correspondingly, the input voltage V1 generates a primary winding voltage V on both sides of the primary winding a. 11 Primary winding voltage V 11 Through coupling via transformer 1112b, an auxiliary winding voltage V3 is generated on the auxiliary winding c. Accordingly, the output voltage V4 of the auxiliary winding circuit 112 is increased, and the output voltage V5 of the power supply circuit 113 is increased.

[0294] Therefore, controller 114 controls the clamping capacitor C of the primary winding circuit 1111b in the ACF converter circuit 111b. c Periodic discharge can make the clamping capacitor C c capacitor voltage V Cc The stepped descent avoids excessively rapid drops that could affect the operation of the ACF converter circuit 111b, thereby improving the stability of the power module 111. Furthermore, the controller 114 controls the clamping capacitor C of the primary winding circuit 1111b in the ACF converter circuit 111b. c Periodic discharge allows the output voltage V4 of the auxiliary winding circuit 112 and the output voltage V5 of the power supply circuit 113 to be increased in a stepwise manner, avoiding damage to circuit components due to excessively rapid increases, thereby improving the stability of the power supply module 111.

[0295] In one embodiment, the controller 114 can control the main power transistor Q in each cycle. L Pilot-on, auxiliary power transistor Q H After conduction. In this embodiment, controller 114 controls the main power transistor Q. L and auxiliary power transistor Q H The periodic alternation of conduction period T2 can be pre-configured, or it can be determined by controller 114 based on the current clamping capacitor C. c capacitor voltage V Cc Or it can be calculated from stored electrical energy. In one embodiment, the clamping capacitor C... c capacitor voltage V Cc When the voltage value is high or the stored energy is large, the period T2 can be set to be smaller. In one embodiment, the period T2 can be the same as the period of control signals G1, G2, G3... or the period of G4, G5, G6... In the embodiments of this application, the controller 114 controls the main power transistor Q in each period. L The duration of conduction and the control of the auxiliary power transistor Q HThe conduction duration can be the same or different. In this embodiment, the controller 114 sends a first control signal G. L Second control signal G H The duty cycles can be the same or different.

[0296] In the scenario where the load level L of the power module 11 drops, the controller 114 provided in this embodiment only needs to control the main power transistor Q in the ACF conversion circuit 111b. L and auxiliary power transistor Q H The controller 114 provided in this application embodiment can not only improve the stability of the ACF conversion circuit 111b, power module 11, and electronic device 10 where it is located, but also has a simple configuration, making it more suitable for use in various products.

[0297] This application also provides an electronic device, including a controller 114 as provided in any embodiment of this application, or including a power module 11 as provided in any embodiment of this application.

[0298] In the foregoing embodiments, the method executed by the controller 114 provided in this application embodiment has been described. To implement the functions of the methods provided in the above embodiments, the controller 114, as the execution subject, may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution. It should be noted that the division of the various modules in the above device is merely a logical functional division; in actual implementation, they can be fully or partially integrated into a single physical entity, or physically separated. Furthermore, these modules can all be implemented in software through processing element calls; they can all be implemented in hardware; or some modules can be implemented in software through processing element calls, while others are implemented in hardware. A separate processing element can be established, or it can be integrated into a chip in the above device. Alternatively, it can be stored as program code in the memory of the above device, and called and executed by a processing element of the above device. The implementation of other modules is similar. Furthermore, these modules can be integrated, either wholly or partially, or implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. During implementation, each step of the above method or each of the above modules can be completed through integrated logic circuits in the hardware of the processor element or through software instructions. For example, these modules can be one or more integrated circuits configured to implement the above method, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs), etc. As another example, when a module is implemented through processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0299] In the above embodiments, the steps performed by the controller 114 can be implemented, in whole or in part, by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks (SSDs)).

[0300] This application also provides a computer-readable storage medium storing computer instructions that, when executed, can be used to perform any of the methods executed by the controller 114 in the foregoing embodiments of this application.

[0301] This application also provides a chip for executing instructions, the chip being used to perform any of the methods executed by the controller 114 as described above in this application.

[0302] This application also provides a computer program product, which includes a computer program stored in a storage medium. At least one processor can read the computer program from the storage medium. When the at least one processor executes the computer program, it can implement any of the methods executed by the controller 114 as described above in this application.

[0303] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disk, or optical disk.

[0304] Those skilled in the art will understand that, for the purpose of illustrating the technical solution of this application, the embodiments of this application are described separately by functional modules, and the circuit devices in each module may partially or completely overlap, which is not intended to limit the scope of protection of this application.

[0305] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A controller for an active clamp flyback converter circuit, the active clamp flyback converter circuit comprising a half-bridge circuit, a transformer, and a rectifier circuit, the half-bridge circuit comprising a main power transistor, an auxiliary power transistor, and a clamping capacitor, the transformer comprising a primary winding, a secondary winding, and an auxiliary winding circuit, the auxiliary winding circuit supplying power to the controller's power supply circuit, characterized in that, The controller is used for: The active clamp flyback converter circuit is controlled to operate in a continuous working state, so that the output voltage of the active clamp flyback converter circuit is the rated output voltage; If the output voltage of the active clamp flyback converter is determined to be higher than a first preset value, the active clamp flyback converter is controlled to operate in a suspended state; the first preset value is less than the overvoltage protection voltage of the active clamp flyback converter and greater than the rated output voltage of the active clamp flyback converter. If the output voltage of the auxiliary winding circuit is determined to be less than or equal to a second preset value, the clamping capacitor of the half-bridge circuit is controlled to discharge; the second preset value is less than the rated input voltage of the power supply circuit and greater than the undervoltage protection voltage of the power supply circuit; or, If the output voltage of the power supply circuit is determined to be less than or equal to a third preset value, the clamping capacitor of the half-bridge circuit is controlled to discharge. The third preset value is less than the rated input voltage of the controller and greater than the undervoltage protection voltage of the controller; The controller controls the discharge of the clamping capacitor, including: The controller controls the auxiliary power transistor of the half-bridge circuit to turn on and the main power transistor to turn off; or... The controller controls the auxiliary power transistor of the half-bridge circuit to conduct periodically and the main power transistor to turn off; or, The controller controls the auxiliary power transistor and the main power transistor of the half-bridge circuit to periodically and alternately turn on and off.

2. The controller according to claim 1, characterized in that, The controller is used for: If the output voltage of the active clamp flyback converter is determined to be less than or equal to the rated output voltage, the active clamp flyback converter is controlled to switch from the paused working state to the continuous working state.

3. The controller according to any one of claims 1-2, characterized in that, The controller controls the active clamp flyback converter circuit to operate in a suspended state, including: The controller controls the auxiliary power transistor and the main power transistor of the half-bridge circuit to be turned off.

4. The controller according to any one of claims 1-2, characterized in that, The controller is used for: If the voltage of the clamping capacitor is determined to be less than or equal to a preset voltage value, the clamping capacitor is controlled to stop discharging; the preset voltage value is the voltage value of the clamping capacitor when the active clamp flyback converter circuit is operating in continuous working state. or, If the output voltage of the auxiliary winding circuit is determined to be greater than or equal to a fourth preset value, the clamping capacitor is controlled to stop discharging; the fourth preset value is less than the overvoltage protection voltage of the power supply circuit and greater than the rated input voltage of the power supply circuit; or, If the output voltage of the power supply circuit is determined to be greater than or equal to a fifth preset value, the clamping capacitor is controlled to stop discharging; the fifth preset value is greater than the rated input voltage of the controller and less than the overvoltage protection voltage of the controller.

5. The controller according to claim 4, characterized in that, The controller controls the clamping capacitor to stop discharging, including: The controller controls the auxiliary power transistor of the half-bridge circuit to turn off.

6. A power supply module, comprising an active clamp flyback converter circuit, an auxiliary winding circuit, a power supply circuit, and a controller, characterized in that, include: The active clamp flyback converter circuit is used to receive the input voltage, perform voltage transformation on the input voltage, and then provide the output voltage to the load. The active clamp flyback converter circuit includes: a half-bridge circuit, a transformer and a rectifier circuit, wherein the half-bridge circuit includes a main power transistor, an auxiliary power transistor and a clamping capacitor; The auxiliary winding circuit is used to supply power to the power supply circuit; The power supply circuit is used to supply power to the controller; The controller is used for: The active clamp flyback converter circuit is controlled to operate in a continuous working state, and the output voltage of the active clamp flyback converter circuit is the rated output voltage; If the output voltage of the active clamp flyback converter is determined to be higher than a first preset value, the active clamp flyback converter is controlled to operate in a suspended state; the first preset value is less than the overvoltage protection voltage of the active clamp flyback converter and greater than the rated output voltage of the active clamp flyback converter. If the output voltage of the auxiliary winding circuit is determined to be less than or equal to a second preset value, the clamping capacitor of the half-bridge circuit is controlled to discharge; the second preset value is less than the rated input voltage of the power supply circuit and greater than the undervoltage protection voltage of the power supply circuit; or, If the output voltage of the power supply circuit is determined to be less than or equal to a third preset value, the clamping capacitor of the half-bridge circuit is controlled to discharge; the third preset value is less than the rated input voltage of the controller and greater than the undervoltage protection voltage of the controller. The controller controls the discharge of the clamping capacitor, including: The controller controls the auxiliary power transistor of the half-bridge circuit to turn on and the main power transistor to turn off; or... The controller controls the auxiliary power transistor of the half-bridge circuit to conduct periodically and the main power transistor to turn off; or, The controller controls the auxiliary power transistor and the main power transistor of the half-bridge circuit to periodically and alternately turn on and off.

7. The power supply module according to claim 6, characterized in that, The controller is used for, If the output voltage of the active clamp flyback converter is determined to be less than or equal to the rated output voltage, the active clamp flyback converter is controlled to switch from the paused working state to the continuous working state.

8. The power module according to any one of claims 6-7, characterized in that, The controller controls the active clamp flyback converter circuit to operate in a suspended state, including: The controller controls the auxiliary power transistor and the main power transistor of the half-bridge circuit to be turned off.

9. The power supply module according to any one of claims 6-7, characterized in that, The controller is used for: If the voltage of the clamping capacitor is determined to be less than or equal to a preset voltage value, the clamping capacitor is controlled to stop discharging; the preset voltage value is the voltage value of the clamping capacitor when the active clamp flyback converter circuit is operating in continuous working state. or, If the output voltage of the auxiliary winding circuit is determined to be greater than or equal to a fourth preset value, the clamping capacitor is controlled to stop discharging; the fourth preset value is less than the overvoltage protection voltage of the power supply circuit and greater than the rated input voltage of the power supply circuit; or, If the output voltage of the power supply circuit is determined to be greater than or equal to a fifth preset value, the clamping capacitor is controlled to stop discharging; the fifth preset value is greater than the rated input voltage of the controller and less than the overvoltage protection voltage of the controller.

10. The power supply module according to claim 9, characterized in that, The controller controls the clamping capacitor to stop discharging, including: The controller controls the auxiliary power transistor of the half-bridge circuit to turn off.

11. An electronic device comprising a controller for an active clamp flyback converter circuit as described in any one of claims 1-5, or comprising a power supply module as described in any one of claims 6-10.

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