A driving circuit of a valley fill circuit, a power module and an electronic device

Abstract

This application discloses a drive circuit, power supply module, and electronic device for a valley-filling circuit. The input voltage terminal of the drive circuit is used to receive power from the primary winding or auxiliary winding of the DC-DC converter circuit, and the reference voltage terminal of the drive circuit is used to connect to the power supply at the output terminal of the full-bridge rectifier circuit. Since the potential of the power supply provided by the primary winding or auxiliary winding of the DC-DC converter circuit is greater than the potential at the output terminal of the full-bridge rectifier circuit, the drive circuit can operate normally under light load on the power supply module, thus improving the stability of the power supply module.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a drive circuit, power supply module, and electronic device for a valley-filling circuit. Background Technology

[0002] The valley fill circuit in a power supply module typically includes a capacitor and a controllable switch. The driver circuit of the valley fill circuit is used to control the on or off of the controllable switch. The driver circuit of the valley fill circuit is usually powered by the capacitor of the valley fill circuit. Under no-load or light-load conditions, the driver circuit of the valley fill circuit may not receive normal power supply, causing the driver circuit of the valley fill circuit to malfunction and affecting the stability of the switching power supply. Summary of the Invention

[0003] This application provides a drive circuit, power supply module, and electronic device for a valley-fill circuit. It can continuously supply power to the drive circuit, ensuring its normal operation and improving the stability of the switching power supply.

[0004] In a first aspect, embodiments of this application provide a driving circuit for a valley-filling circuit. The valley-filling circuit includes a controllable switch and a first capacitor. The first capacitor is connected to the output terminal of a full-bridge rectifier circuit via the controllable switch. The driving circuit includes:

[0005] The driver end is used to control the on or off of the controllable switch;

[0006] The input voltage terminal is used to receive power from the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit.

[0007] The reference voltage terminal is used to connect to the power supply of the full-bridge rectifier circuit.

[0008] The potential supplied by the primary winding or auxiliary winding is greater than the potential at the output terminal of the full-bridge rectifier circuit.

[0009] In this embodiment, by connecting the input voltage terminal of the drive circuit to the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit, the voltage difference between the input voltage terminal of the drive circuit and the output terminal of the full-bridge rectifier circuit is greater than or equal to the minimum input voltage of the drive circuit. This ensures the drive circuit receives continuous power, driving the controllable switch to turn on or off. For example, even when the power module is under no-load or light-load conditions, the normal operation of the drive circuit can be guaranteed, improving the stability of the power module.

[0010] In one possible design, the DC-DC converter circuit includes an active clamp flyback converter circuit. One end of the primary winding is connected to the output of the full-bridge rectifier circuit, and the other end is connected to the source of the first power transistor. The drain of the first power transistor is connected to the output of the full-bridge rectifier circuit via a clamping capacitor. The input voltage terminal is connected to the junction of the first power transistor and the clamping capacitor. By connecting the input voltage terminal of the drive circuit to the junction of the clamping capacitor and the first power transistor in the active clamp flyback converter circuit, the potential at the input voltage terminal of the drive circuit is made greater than the potential at the output of the full-bridge rectifier circuit. The drive circuit can operate normally when the power module is under no-load or light-load conditions, thereby controlling the on / off state of the controllable switch and improving the stability of the power module.

[0011] In another possible design, the DC-DC converter is a single-ended flyback converter. One end of the primary winding is connected to the output of the full-bridge rectifier circuit, and the other end is connected to the anode of the clamping diode. The cathode of the clamping diode is connected to the output of the full-bridge rectifier circuit via a clamping capacitor. The input voltage terminal is connected to the junction of the clamping diode and the clamping capacitor. By connecting the input voltage terminal of the drive circuit to the junction of the clamping capacitor and the clamping diode in the single-ended flyback converter circuit, the potential at the input voltage terminal of the drive circuit is made greater than the potential at the output of the full-bridge rectifier circuit. The drive circuit can operate normally when the power module is under no-load or light-load conditions, thereby controlling the on / off state of the controllable switch and improving the stability of the power module.

[0012] In another possible design, the DC-DC converter is a half-bridge resonant converter. The auxiliary winding is connected to the output of the full-bridge rectifier circuit via diodes and capacitors, and the input voltage terminal is connected between the diodes and capacitors. By connecting the input voltage terminal between the diodes and capacitors in the half-bridge resonant converter circuit, the potential at the input voltage terminal of the drive circuit is made greater than the potential at the output of the full-bridge rectifier circuit. The drive circuit can operate normally when the power module is under no-load or light-load conditions, thereby controlling the on / off state of the controllable switch and improving the stability of the power module.

[0013] In another possible design, the anode of the diode is connected to the auxiliary winding, the cathode of the diode is connected to the input voltage terminal and one end of the capacitor, and the other end of the capacitor is connected to the output terminal of the full-bridge rectifier circuit.

[0014] In another possible design, the controllable switch is a field-effect transistor (FET), which includes a parasitic diode. The anode of the parasitic diode is connected to the output of the full-bridge rectifier circuit, and the cathode of the anode is connected to a capacitor. Under normal operating conditions of the drive circuit, the FET is turned on or off by controlling it, thus improving the stability of the power supply module.

[0015] In another possible design, the drive circuit includes a controller that controls the DC-DC converter circuit. The controller outputs a control signal to turn the power transistors in the DC-DC converter circuit on or off, ensuring that the voltage at the input voltage connection point of the drive circuit is higher than the bus voltage, thereby guaranteeing the normal operation of the drive circuit.

[0016] Secondly, embodiments of this application provide a power supply module, including a full-bridge rectifier circuit, a valley-fill circuit, a DC-DC converter circuit, and a drive circuit. The external power received by the power supply module is processed by the full-bridge rectifier circuit, the valley-fill circuit, and the DC-DC converter circuit to supply power to the load.

[0017] The valley filling circuit includes a controllable switch and a first capacitor, which is connected to the output terminal of the full-bridge rectifier circuit via the controllable switch.

[0018] The drive circuit includes a drive terminal, an input voltage terminal, and a reference voltage terminal. The drive terminal is used to control the conduction or cutoff of the controllable switch. The input voltage terminal is used to receive power from the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit. The reference voltage terminal is used to receive power from the full-bridge rectifier circuit.

[0019] The input voltage terminal potential is greater than the output potential of the full-bridge rectifier circuit.

[0020] In this embodiment, by connecting the input voltage terminal of the drive circuit to the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit, the voltage difference between the input voltage terminal of the drive circuit and the output terminal of the full-bridge rectifier circuit is greater than or equal to the minimum input voltage of the drive circuit. This ensures the drive circuit receives continuous power, driving the controllable switch to turn on or off. For example, even when the power module is under no-load or light-load conditions, the normal operation of the drive circuit can be guaranteed, improving the stability of the power module.

[0021] In another possible design, the DC-DC converter circuit is an active clamp flyback converter circuit, which includes a transformer, a clamping capacitor, a first power transistor, and a second power transistor. One end of the primary winding of the transformer is connected to the output terminal of the full-bridge rectifier circuit. One end of the clamping capacitor is connected to one end of the primary winding of the transformer, and the other end of the clamping capacitor is connected to the drain of the first power transistor. The source of the first power transistor is connected to the other end of the primary winding of the transformer, and the drain of the second power transistor is connected to the other end of the primary winding of the transformer. The source of the second power transistor is connected to the reference ground.

[0022] The input voltage terminal is connected to the connection point between the clamping capacitor and the first power transistor.

[0023] In another possible design, the DC-DC converter circuit includes a single-ended flyback converter circuit, which includes a transformer, a clamping capacitor, a clamping diode, and a second power transistor. One end of the primary winding of the transformer is connected to the output of the full-bridge rectifier circuit. One end of the clamping capacitor is connected to one end of the primary winding of the transformer. The other end of the clamping capacitor is connected to the cathode of the clamping diode. The anode of the clamping diode is connected to the other end of the primary winding of the transformer. The drain of the second power transistor is connected to the other end of the primary winding of the transformer, and the source of the second power transistor is connected to the reference ground.

[0024] The input voltage terminal is connected between the clamping capacitor and the clamping diode.

[0025] In another possible design, the DC-DC converter circuit includes a half-bridge resonant converter circuit and an auxiliary winding. The auxiliary winding is connected to the output of the full-bridge rectifier circuit via diodes and capacitors, and the input voltage terminal is connected to the junction of the diodes and capacitors.

[0026] In another possible design, the auxiliary winding is connected to the anode of the diode, the anode of the diode is connected to one end of the capacitor, and the other end of the capacitor is connected to the output of the full-bridge rectifier circuit.

[0027] In another possible design, the half-bridge resonant converter circuit includes a transformer, a resonant capacitor, a first power transistor, and a second power transistor. The drain of the first power transistor is connected to the output terminal of the full-bridge rectifier circuit, and the source of the first power transistor is connected to the drain of the second power transistor. One end of the primary winding of the transformer is connected to the source of the first power transistor and the drain of the second power transistor, and the other end of the primary winding of the transformer is connected to the source of the second power transistor through the resonant capacitor.

[0028] Thirdly, embodiments of this application provide an electronic device including a driving circuit of the first aspect and any possible design of the first aspect, or a power module of the second aspect and any possible design of the second aspect.

[0029] It should be understood that the implementation and beneficial effects of the above-mentioned aspects or any possible implementation methods of this application can be referred to each other. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0031] Figure 1 This is a schematic diagram of a power supply module;

[0032] Figure 2 This is a schematic diagram of an electronic device provided in this application;

[0033] Figure 3 This is another schematic diagram of an electronic device provided in this application;

[0034] Figure 4 This is another schematic diagram of an electronic device provided in this application;

[0035] Figure 5 This is another schematic diagram of an electronic device provided in this application;

[0036] Figure 6 This is another schematic diagram of an electronic device provided in this application;

[0037] Figure 7A This is a schematic diagram of a power module provided in an embodiment of this application;

[0038] Figure 7B This is a schematic diagram of a driving circuit provided in an embodiment of this application;

[0039] Figure 8 This is another schematic diagram of a power module provided in an embodiment of this application;

[0040] Figure 9 This is another schematic diagram of a power module provided in an embodiment of this application;

[0041] Figure 10 This is another schematic diagram of a power module provided in an embodiment of this application;

[0042] Figure 11 This is another schematic diagram of a power module provided in an embodiment of this application. Detailed Implementation

[0043] The embodiments of this application are described below with reference to the accompanying drawings.

[0044] Figure 1 This is a schematic diagram of a power supply module. (Example) Figure 1 As shown, the power supply module includes a full-bridge rectifier circuit 101, a valley-fill circuit 102, a drive circuit 103, and a subsequent circuit 104.

[0045] Valley-filling circuit 102 includes a controllable switch 1021 and a capacitor 1022. Exemplarily, the controllable switch 1021 includes a parasitic diode. The anode of the parasitic diode is connected to the output terminal of the full-bridge rectifier circuit 101, and the anode of the parasitic diode is connected to the capacitor 1022. When the controllable switch 1021 is off, the capacitor 1022 is connected to the output terminal of the full-bridge rectifier circuit 101 through the parasitic diode of the controllable switch 1021. When the controllable switch 1021 is on, the capacitor 1022 does not need to be connected to the output terminal of the full-bridge rectifier circuit 101 through the parasitic diode of the controllable switch 1021. Typically, the output terminal of the full-bridge rectifier circuit 101 can also be referred to as the bus.

[0046] The drive circuit 103 is used to control the on or off state of the controllable switch 1021. The drive circuit 103 receives power from the capacitor 1022 and the output of the full-bridge rectifier circuit 101. For example, the input voltage terminal of the drive circuit 103 is connected between the capacitor 1022 and the controllable switch 1021, and the reference voltage terminal of the drive circuit 103 is connected to the output of the full-bridge rectifier circuit 101.

[0047] VCC represents the voltage across capacitor 1022, VEE represents the bus voltage, and Vin_min represents the minimum input voltage of drive circuit 103. When the power module is under no-load or light-load conditions, both VEE and VCC are close to the peak bus voltage. The voltage difference between VEE and VCC is less than Vin_min, and drive circuit 103 cannot operate normally. Consequently, drive circuit 103 cannot control controllable switch 1021. When the power module switches from no-load or light-load to heavy-load, VEE drops rapidly because capacitor 1022 cannot be connected to the bus in time, affecting the stability of the power module.

[0048] To address the aforementioned technical problems, this application provides a driving circuit, power supply module, and electronic device for a valley-filling circuit, which can improve the stability of the power supply module.

[0049] Figure 2 This is a schematic diagram of an electronic device provided in this application. Figure 2 As shown, electronic device 1 is used to receive input voltage V in and provides output voltage V out Power is supplied to load 20.

[0050] In the embodiments of this application, the electronic device may be a mobile phone, a laptop computer, a computer case, an electric vehicle, a smart speaker, a smartwatch, or a wearable device, etc.

[0051] Figure 3 This is another schematic diagram of an electronic device provided in this application. For example... Figure 3 As shown, the electronic device 1 includes a power supply module 10 and a load 20. The power supply module 10 is used to receive an input voltage V.in and provides output voltage V out Power is supplied to load 20.

[0052] Figure 4 This is another schematic diagram of an electronic device provided in this application. For example... Figure 4 As shown, the electronic device 1 also includes a power supply module 10, a load 20, and an input power supply 30. The input power supply 30 is used to receive an input voltage V. in It also supplies power to the power module 10. The power module 10 receives power from the input power supply 30 and provides an output voltage V. out Power is supplied to load 20.

[0053] In this embodiment of the application, the electronic device may be a power adapter, charger, power bank, or other power supply device.

[0054] Figure 5 This is another schematic diagram of an electronic device provided in this application. For example... Figure 5 As shown, the electronic device 1 includes a power supply module 10. The power supply module 10 is used to receive the input voltage V. in and provides output voltage V out Power is supplied to load 20.

[0055] Figure 6 This is another schematic diagram of an electronic device provided in this application. For example... Figure 6 As shown, the electronic device 1 includes a power supply module 10 and an input power supply 30. The input power supply 30 is used to receive an input voltage V. in It also supplies power to the power module 10. The power module 10 receives power from the input power supply 30 and provides an output voltage V. out Power is supplied to load 20.

[0056] In this embodiment, the electronic device 1 may include multiple power modules 10, each of which receives power from the input power supply 30 and provides an output voltage V. out Power is supplied to load 20. In one embodiment, electronic device 1 may include multiple loads 20, and power module 10 receives power from input power supply 30 and provides multiple output voltages V. out The electronic device 1 provides power to multiple loads 20 respectively. In one embodiment, the electronic device 1 may include multiple power modules 10 and multiple loads 20, with the multiple power modules 10 respectively providing multiple output voltages V. out Powers multiple loads 20.

[0057] In this embodiment, the input power supply 30 may further include an energy storage device. Accordingly, when the electronic device 1 operates independently, the energy storage device of the input power supply 30 can supply power to the power module 10. In one embodiment, the input voltage V of the electronic device 1...in The input power supply 30 is AC, and includes an AC / DC converter. In one embodiment, the input voltage V of the electronic device 1 is... in The input power supply 30 is DC power and includes a DC-DC conversion circuit.

[0058] In this embodiment, the load 20 of the electronic device 1 may include one or more of a power-consuming device, an energy storage device, or an external device. In one embodiment, the load 20 may be a power-consuming device of the electronic device 1, such as a processor or a display. In one embodiment, the load 20 may be an energy storage device of the electronic device 1, such as a battery. In one embodiment, the load 20 may be an external device of the electronic device 1, such as a display, a keyboard, or other electronic devices.

[0059] In this embodiment of the application, the output voltage V of the power module 10 out The voltage is direct current (DC). In one embodiment, the input voltage V of electronic device 1 is... in The power supply module 10 includes an AC / DC converter, which is used for AC power. In one embodiment, the input voltage Vin of the electronic device 1 is DC power, and the power supply module 10 includes a DC-DC conversion circuit.

[0060] Figure 7A This is a schematic diagram of a power module provided in an embodiment of this application. The power module provided in this embodiment can be applied to the electronic devices provided in this embodiment. Figure 7A As shown, the power supply module 10 is used to receive the input voltage V1 and provide the output voltage V2. The power supply module 10 includes a full-bridge rectifier circuit 111, a valley-fill circuit 112, a DC-DC converter circuit 113, a controller 114, and a drive circuit 115.

[0061] The full-bridge rectifier circuit 111 receives the input voltage V1 and provides the output voltage V11. The full-bridge rectifier circuit 111 converts alternating current (AC) with varying polarity into unidirectional pulsating direct current (DC). After converting the alternating current into unidirectional pulsating DC, the unidirectional pulsating DC exhibits peaks and troughs.

[0062] Valley fill circuit 112 is used to receive output voltage V11 and provide output voltage V12. In one embodiment, valley fill circuit 112 may include a single-switch, single-capacitor valley fill circuit. Through the charging and discharging of valley fill circuit 112, the unidirectional pulsating DC output from full-bridge rectifier circuit 111 is adjusted into a smooth DC output.

[0063] The DC-DC converter circuit 113 is used to receive the output voltage V12 and provide the output voltage V2. In embodiments of this application, the DC-DC converter circuit 113 is an isolated DC-DC converter circuit including a transformer. In one embodiment, the transformer of the DC-DC converter circuit 113 includes a primary winding and a secondary winding. In another embodiment, the transformer of the DC-DC converter circuit 113 includes a primary winding, a secondary winding, and an auxiliary winding.

[0064] In one embodiment, the DC-DC converter 113 may be a single-ended flyback converter. In one embodiment, the DC-DC converter 113 may be an active-clamp flyback converter. In one embodiment, the DC-DC converter 113 may be a half-bridge resonant converter. In one embodiment, the DC-DC converter 113 may be an asymmetric half-bridge converter.

[0065] The controller 114 is used to control the operating state of the DC-DC converter circuit 113. In this embodiment, the controller 114 can be a primary-side integrated circuit (IC). In one embodiment, the controller 114 includes a pulse width modulation (PWM) controller.

[0066] The drive circuit 115 is used to control the operating state of the valley filling circuit 112. Specifically, the drive circuit 115 is used to control the on or off of the controllable switch 1021 in the valley filling circuit 112, thereby controlling the charging and discharging of the valley filling circuit 112. In one embodiment, the drive circuit 115 can be integrated into the controller 114. In another embodiment, the controller 114 can integrate the drive circuit 115.

[0067] Figure 7B This is a schematic diagram of a driving circuit provided in an embodiment of this application. For example... Figure 7B As shown, the drive circuit 115 may include a drive module 1151, a control module 1152, and a power supply module 1153. In one embodiment, the drive module 1151 may be an isolated drive chip. In another embodiment, the drive module 1151 may be another circuit capable of receiving control signals and driving the valley-fill circuit 112 to turn on or off. For example, one or more of a Zener diode, a drive chip, or a signal pulse transformer. In one embodiment, the control module 1152 of the drive circuit 115 may be integrated into... Figure 7A The controller 114 is shown. In one embodiment, the power supply module 1153 can be a low dropout regulator (LDO) or a buck converter circuit.

[0068] Figure 8 This is another schematic diagram of a power module provided in an embodiment of this application. (See diagram below.) Figure 8 As shown, the power supply module 10 includes a full-bridge rectifier circuit 111, a valley-fill circuit 112, a DC-DC converter circuit 113, a controller 114, and a drive circuit 115. Figure 8 and Figure 7A , Figure 7B The same parts will not be repeated.

[0069] In this embodiment, the valley-filling circuit 112 includes a controllable switch 1121 and a first capacitor 1122. A first terminal of the controllable switch 1121 is connected to the output terminal of the full-bridge rectifier circuit 111, a second terminal of the controllable switch 1121 is connected to one end of the first capacitor 1122, and the other end of the first capacitor 1122 is connected to reference ground. A third terminal of the controllable switch 1121 is connected to the output terminal Drv of the drive circuit 115.

[0070] In one embodiment, the controllable switch 1121 is a field-effect transistor (FET). FETs include parasitic diodes or reverse conduction capabilities. In embodiments of this application, the FET can be any one of a metal-oxide-semiconductor field-effect transistor (MOSFET) or a gallium nitride field-effect transistor (GaNFET).

[0071] In this embodiment, a MOSFET is used as an example to illustrate a field-effect transistor. Exemplarily, the source of the field-effect transistor is connected to the output terminal of the full-bridge rectifier circuit 111, the drain of the field-effect transistor is connected to one end of the first capacitor 1122, and the gate of the field-effect transistor is connected to the driving circuit 115. The anode of the parasitic diode is connected to the output terminal of the full-bridge rectifier circuit 111, and the cathode of the parasitic diode is connected to one end of the first capacitor 1122.

[0072] In one embodiment, the controllable switch 1121 is a combination of a diode and a unidirectional controllable switch; the unidirectional controllable switch can be any one of a bipolar junction transistor (BJT) or an insulated gate bipolar transistor (IGBT). For example, the diode is connected in series with the first capacitor 1122, and the control switch is connected in parallel with the diode.

[0073] In one embodiment, the controllable switch 1121 is a diode and a switching transistor. For example, the diode is connected in series with the first capacitor 1122, and the control switch is connected in parallel with the diode.

[0074] In this embodiment, the driving circuit 115 includes a driving terminal Drv, an input voltage terminal Vin, and a reference voltage terminal Vref. The driving terminal Drv is connected to the controllable switch 1121 and is used to output a driving signal to control the controllable switch 1121 to turn on or off. The reference voltage terminal Vref is connected to the output terminal of the full-bridge rectifier circuit 111 and is used to receive power from the output terminal of the full-bridge rectifier circuit 111. That is, the reference voltage terminal Vref is connected to the bus and is used to receive power from the bus.

[0075] The input voltage terminal Vin is used to receive power from the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit 113. In this embodiment, the potential of the power supply provided by the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit 113 is greater than the potential of the output terminal of the full-bridge rectifier circuit 111.

[0076] In this embodiment of the application, the primary winding of the DC-DC converter circuit 113 can be connected to the output terminal of the full-bridge rectifier circuit 111.

[0077] In one embodiment, the DC-DC converter circuit 113 includes a single-ended flyback converter circuit, with the two ends of the primary winding connected via a clamping diode and a clamping capacitor. The input voltage terminal Vin of the drive circuit 115 is connected to the junction of the clamping capacitor and the clamping diode.

[0078] In one embodiment, the DC-DC converter circuit 113 includes an active clamping converter circuit, with the two ends of the primary winding connected to a first power transistor via a clamping capacitor. The input voltage terminal Vin of the drive circuit 115 is connected to the connection point between the clamping capacitor and the first power transistor of the DC-DC converter circuit 113.

[0079] In one embodiment, the DC-DC converter circuit 113 includes a half-bridge resonant converter circuit and an auxiliary winding. The auxiliary winding is connected to the output terminal of the full-bridge rectifier circuit 111 via a diode and a capacitor. The input voltage input terminal Vin of the drive circuit 115 is connected to the junction of the diode and the capacitor.

[0080] In the power module provided in this application embodiment, the drive circuit of the valley filling circuit is powered by the primary winding or auxiliary winding of the transformer in the DC-DC converter circuit 113. The normal operation of the drive circuit can be guaranteed even when the power module is under no-load or light-load conditions, thereby improving the stability of the power module.

[0081] Figure 9 This is another schematic diagram of a power module provided in an embodiment of this application. For example... Figure 9 As shown, the power supply module 10 includes a full-bridge rectifier circuit 111, a valley-fill circuit 112, a DC-DC converter circuit 113, a controller 114, and a drive circuit 115. Figure 9 and Figure 8 The same parts will not be repeated.

[0082] like Figure 9 As shown, the DC-DC converter circuit 113 includes a transformer 1131, a second capacitor 1132, a diode 1133, a second power transistor 1134, and a rectifier circuit 1135.

[0083] The primary winding of transformer 1131 is connected at both ends via a second capacitor 1132 and a diode 1133. For example, one end of the primary winding of transformer 1131 is connected to the output of the full-bridge rectifier circuit 111; one end of the second capacitor 1132 is connected to one end of the primary winding of transformer 1131; the other end of the second capacitor 1132 is connected to the cathode of diode 1133; and the anode of diode 1133 is connected to the other end of the primary winding of transformer 1131. For example, the second power transistor 1134 can be a MOSFET. The drain of the second power transistor 1134 is connected to the other end of the primary winding of transformer 1131. The source of the second power transistor 1134 is connected to reference ground. The gate of the second power transistor 1134 is connected to controller 114 to receive control signals from controller 114. The input voltage terminal Vin of the drive circuit 115 is connected to the junction of the other end of the second capacitor 1132 and the cathode of diode 1133. That is, the input voltage terminal Vin of the drive circuit 115 is connected to the connection point of the second capacitor 1132 and the diode 1133.

[0084] The secondary winding of transformer 1131 is connected to rectifier circuit 1135 for supplying power to the load via rectifier circuit 1135. In one embodiment, rectifier circuit 1135 includes rectifier capacitor and rectifier diode.

[0085] In this embodiment, the DC-DC converter circuit 113 includes a single-ended flyback converter circuit. The second power transistor 1134 can be a primary-side flyback MOSFET, the second capacitor 1132 can be a clamping capacitor, and the diode 1133 is a clamping diode. Exemplarily, the upper end of the secondary winding of the transformer 1131 and the lower end of the primary winding are of the same name. The input voltage terminal Vin of the drive circuit 115 is connected to the junction point between the other end of the second capacitor 1132 (clamping capacitor) and the cathode of the diode 1133 (clamping diode). That is, the junction point between the diode 1133 (clamping diode) and the second capacitor 1132 is used to connect to the input voltage terminal Vin of the drive circuit 115.

[0086] Figure 10 This is another schematic diagram of a power module provided in an embodiment of this application. For example... Figure 10 As shown, the power module 10 includes a full-bridge rectifier circuit 111, a valley-fill circuit 112, a DC-DC converter circuit 113, a controller 114, and a drive circuit 115. Figure 10 and Figure 9The same parts will not be repeated.

[0087] like Figure 10 As shown, Figure 9 In the DC-DC converter circuit 113, diode 1133 is replaced with a first power transistor 1133. The two ends of the primary winding of transformer 1131 are connected through the first power transistor 1133 and the second capacitor 1132. For example, the first power transistor 1133 can be a MOSFET. One end of the primary winding of transformer 1131 is connected to the output terminal of the full-bridge rectifier circuit 111, one end of the second capacitor 1132 is connected to one end of the primary winding of transformer 1131, the other end of the second capacitor 1132 is connected to the drain of the first power transistor 1133, and the source of the first power transistor 1133 is connected to the other end of the primary winding of transformer 1131. That is, the input voltage terminal Vin of the drive circuit 115 is connected to the connection point between the first power transistor 1133 and the second capacitor 1132.

[0088] In this embodiment, the DC-DC converter circuit 113 includes an active clamp flyback converter circuit. The first power transistor 1133 and the second power transistor 1134 can be primary-side flyback MOSFETs, and the second capacitor 1132 can be a clamping capacitor. Exemplarily, the two ends of the primary winding of the transformer 1131 are connected through the first power transistor 1133 and the clamping capacitor 1132. The input voltage terminal Vin of the drive circuit 115 is connected to the junction point between the other end of the clamping capacitor 1132 and the drain of the first power transistor 1133. That is, the input voltage terminal Vin of the drive circuit 115 is connected to the junction point between the first power transistor 1133 and the clamping capacitor 1132.

[0089] During normal operation, controller 114 controls the second power transistor 1134 to conduct. When the conduction time reaches a set time or the current amplitude reaches a preset threshold, controller 114 controls the second power transistor 1134 to turn off. The primary winding current of transformer 1131 charges the second capacitor 1132 through diode 1133. Correspondingly, the potential at the connection point between the second capacitor 1132 and diode 1133 is higher than the bus potential.

[0090] When the power supply module 10 is under no-load or light-load conditions, in order to maintain a stable output voltage, the DC-DC converter circuit 113 controls the second power transistor 1134 to switch intermittently by the controller 114, and the second capacitor 1132 is charged intermittently. Accordingly, the voltage at the connection point between the second capacitor 1132 and the diode 1133 is higher than the bus voltage.

[0091] The driving circuit 115 provided in this application embodiment can operate normally when the power module 10 is under no-load or light-load conditions, thereby controlling the conduction or cutoff of the controllable switch 1121 and improving the stability of the power module 10.

[0092] Figure 11This is another schematic diagram of a power module provided in an embodiment of this application. For example... Figure 11 As shown, the power module 10 includes a full-bridge rectifier circuit 111, a valley-fill circuit 112, a DC-DC converter circuit 113, a controller 114, and a drive circuit 115. Figure 11 and Figure 10 The same parts will not be repeated.

[0093] like Figure 11 The DC-DC converter circuit 113 includes a transformer 1131, a second capacitor 1132, a first power transistor 1133, a second power transistor 1134, a rectifier circuit 1135, an auxiliary winding 1136, and a diode 1137. In this embodiment, the DC-DC converter circuit 113 includes a half-bridge resonant converter circuit. In one embodiment, the half-bridge resonant converter circuit is an asymmetric half-bridge converter circuit, where the first power transistor 1133 can be an excitation MOSFET, the second power transistor 1134 can be a freewheeling MOSFET, and the second capacitor 1132 is a resonant capacitor.

[0094] For example, the output terminal of the full-bridge rectifier circuit 111 is connected to the drain of the first power transistor 1133, and the source of the first power transistor 1133 is connected to the drain of the second power transistor 1134. One end of the primary winding of the transformer 1131 is connected to the source of the first power transistor 1133 and the drain of the second power transistor 1134. The other end of the primary winding of the transformer 1131 is connected to the source of the second power transistor 1134 via the second capacitor 1132. In this embodiment, the connection point between the source of the first power transistor 1133 and the drain of the second power transistor 1134 is also called the midpoint of the bridge arm.

[0095] The auxiliary winding 1136 is coupled to the primary winding of the transformer 1131. The auxiliary winding 1136 is connected to the output terminal of the full-bridge rectifier circuit 111 via diode 1137 and capacitor 1138, supplying power to the input voltage terminal Vin of the drive circuit 115. That is, the input voltage terminal Vin of the drive circuit 115 is connected to the junction of diode 1137 and capacitor 1138.

[0096] For example, one end of the auxiliary winding 1136 is connected to the midpoint of the bridge arm, and the other end of the auxiliary winding is connected to the anode of the diode 1137. The cathode of the diode 1137 is connected to the output terminal of the full-bridge rectifier circuit 111 via the capacitor 1138. The auxiliary winding is coupled to the primary winding, and the other end of the auxiliary winding and the end of the primary winding connected to the midpoint of the bridge arm are identical terminals. Accordingly, the voltage at the other end of the auxiliary winding is higher than the bus voltage when the first power transistor 1133 is turned on. Therefore, the potential at the connection point of the diode 1137 and the capacitor 1138 is always higher than the bus potential. When the power module 10 is under no-load or light-load conditions, the first power transistor 1133 and the second power transistor 1134 in the DC-DC converter circuit 113 will be intermittently turned on to maintain a stable output voltage. Correspondingly, the drive circuit 115 can also operate normally to control the on or off of the controllable switch 1121, improving the stability of the power module 10.

[0097] It should be noted that the power supply module described above is merely illustrative. Any circuit that satisfies the requirement that the voltage of the power supply received by the drive circuit from the power supply point of the DC-DC converter is greater than the voltage at the output terminal of the full-bridge rectifier circuit is within the scope of protection of this application.

[0098] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. Any modifications, equivalent substitutions, or improvements made within the principles of this application should be included within the scope of protection of this application.

Claims

1. A drive circuit of a valley fill circuit, the valley fill circuit including a controllable switch and a first capacitor connected to an output terminal of a full-bridge rectification circuit via the controllable switch, characterized by, The drive circuit comprises: a driving end for controlling the on or off of the controllable switch; an input voltage end for receiving power supplied by a primary winding or an auxiliary winding of a transformer in a direct current conversion circuit; a reference voltage end for connecting power supply of the full-bridge rectifier circuit; The potential of the power supplied by the primary winding or the auxiliary winding is greater than the potential of the output end of the full-bridge rectifier circuit.

2. The drive circuit of claim 1, wherein, The direct current conversion circuit comprises an active clamping flyback conversion circuit, one end of the primary winding is connected to the output end of the full-bridge rectifier circuit, the source of a first power tube is connected to one end of the primary winding, the drain of the first power tube is connected to the output end of the full-bridge rectifier circuit through a clamping capacitor, and the input voltage end is connected to the connection point of the first power tube and the clamping capacitor.

3. The drive circuit of claim 1, wherein, The direct current conversion circuit is a single-ended flyback conversion circuit, one end of the primary winding is connected to the output end of the full-bridge rectifier circuit, the anode of a clamping diode is connected to one end of the primary winding, the cathode of the clamping diode is connected to the output end of the full-bridge rectifier circuit through a clamping capacitor, and the input voltage end is connected to the connection point of the clamping diode and the clamping capacitor.

4. The drive circuit of claim 1, wherein, The direct current conversion circuit is a half-bridge resonant conversion circuit, the auxiliary winding is connected to the output end of the full-bridge rectifier circuit through a diode and a capacitor, and the input voltage end is connected between the diode and the capacitor.

5. The drive circuit of claim 4, wherein, The anode of the diode is connected to the auxiliary winding, the cathode of the diode is connected to the input voltage end and one end of the capacitor, and the other end of the capacitor is connected to the output end of the full-bridge rectifier circuit.

6. The drive circuit of claim 5, wherein, The controllable switch is a field effect transistor, the field effect transistor comprises a parasitic diode, the anode of the parasitic diode is connected to the output end of the full-bridge rectifier circuit, and the cathode of the parasitic diode is connected to the capacitor.

7. The drive circuit according to any one of claims 1 to 6, wherein The drive circuit comprises a controller for controlling the direct current conversion circuit.

8. A power module, characterized by The power supply module comprises a full-bridge rectifier circuit, a valley fill circuit, a direct current conversion circuit and a drive circuit, and the external power supply received by the power supply module is processed by the full-bridge rectifier circuit, the valley fill circuit and the direct current conversion circuit to supply power to a load, wherein The valley fill circuit comprises a controllable switch and a first capacitor, and the first capacitor is connected to the output end of the full-bridge rectifier circuit through the controllable switch; The drive circuit comprises a driving end, an input voltage end and a reference voltage end, the driving end is used for controlling the on or off of the controllable switch, the input voltage end is used for receiving power supplied by a primary winding or an auxiliary winding of a transformer in a direct current conversion circuit, and the reference voltage end is used for receiving power supply of the full-bridge rectifier circuit; The potential of the input voltage end is greater than the potential of the output end of the full-bridge rectifier circuit.

9. The power module of claim 8, wherein, The direct current conversion circuit is an active clamp flyback conversion circuit, which comprises the transformer, a clamp capacitor, a first power tube and a second power tube, one end of a primary winding of the transformer is connected with an output end of the full-bridge rectification circuit, one end of the clamp capacitor is connected with one end of the primary winding of the transformer, the other end of the clamp capacitor is connected with a drain of the first power tube, a source of the first power tube is connected with the other end of the primary winding of the transformer, a drain of the second power tube is connected with the other end of the primary winding of the transformer, and a source of the second power tube is connected with a reference ground. The input voltage end is connected between the clamp capacitor and the connection point of the first power tube.

10. The power module of claim 8, wherein, The direct current conversion circuit comprises a single-end flyback conversion circuit, which comprises the transformer, a clamp capacitor, a clamp diode and a second power tube, one end of a primary winding of the transformer is connected with an output end of the full-bridge rectification circuit, one end of the clamp capacitor is connected with one end of the primary winding of the transformer, the other end of the clamp capacitor is connected with a cathode of the clamp diode, an anode of the clamp diode is connected with the other end of the primary winding of the transformer, a drain of the second power tube is connected with the other end of the primary winding of the transformer, and a source of the second power tube is connected with a reference ground. The input voltage end is connected between the clamp capacitor and the connection point of the clamp diode.

11. The power module of claim 8, wherein the first and second power supply modules are configured to provide power to the power module in a redundant configuration. The direct current conversion circuit comprises a half-bridge resonant conversion circuit and an auxiliary winding, the auxiliary winding is connected to an output end of the full-bridge rectification circuit through a diode and a capacitor, and the input voltage end is connected between the connection point of the diode and the capacitor.

12. The power module of claim 11, wherein, The auxiliary winding is connected with an anode of the diode, the anode of the diode is connected with one end of the capacitor, and the other end of the capacitor is connected with the output end of the full-bridge rectification circuit.

13. The power module of claim 12, wherein, The half-bridge resonant conversion circuit comprises the transformer, a resonant capacitor, a first power tube and a second power tube, a drain of the first power tube is connected with an output end of the full-bridge rectification circuit, a source of the first power tube is connected with a drain of the second power tube, one end of a primary winding of the transformer is connected with the source of the first power tube and the drain of the second power tube, and the other end of the primary winding of the transformer is connected with the source of the second power tube through the resonant capacitor.

14. An electronic device, comprising: The driving circuit comprises the driving circuit according to any one of claims 1-7, or the power supply module comprises the power supply module according to any one of claims 8-13.

Images