Power supply starting circuit and power supply module

Abstract

The utility model discloses a power supply starting circuit and a power supply module. The power supply starting circuit comprises a power supply chip, a switch module and a control module. The power supply chip comprises a high-voltage VH pin, and when the power supply chip is not connected to a working power supply, the power supply chip is connected to an external power supply based on the VH pin to start the power supply module; the switch module is arranged between an external power supply and the VH pin and is used for controlling the connection relation between the external power supply and the VH pin based on the on-off state of the switch module; the control module is connected with the switch module and used for controlling the switch module to be cut off after a working power supply is connected. The power module is used for generating working power. The switch module is arranged between the external power supply and the VH pin of the power supply chip, and after the power supply module generates the working power supply, the control module controls the switch module to cut off and disconnect the connection between the external power supply and the power supply chip, so that the voltage difference between the VH pin and the adjacent pin is reduced, and the ignition risk of the power supply chip and the standby power consumption of the power supply module are reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply, and in particular to a power supply starting circuit and a power supply module. Background Art

[0002] When the AC-DC power module is powered on, the high voltage (Voltage High, VH) pin of the power chip of the AC-DC power module draws power from the external AC power supply, and the switch element inside the power chip is turned on to generate a startup working power supply for starting the AC-DC power module. After the AC-DC power module is started, the working power supply is generated, and the power chip is connected to the working power supply through the working voltage (VoltCurrent Condenser, VCC) pin. The switch element inside the power chip is turned off, and the power supply of the power chip is changed from the external AC power supply to the working power supply, completing the startup process of the AC-DC power module.

[0003] After the AC-DC power module is started, the VH pin of the power chip is in a suspended state, and the voltage of the VH pin is equal to the bus voltage; since the electrical clearance between the VH pin and the VCC pin is small, and the voltage of the VH pin is much higher than the voltage of the VCC pin, there is a risk of sparking between the VH pin and the VCC pin. In the related art, the VH pin is usually treated with glue or a pull-down grounding resistor is added to the VH pin to prevent the VH pin from sparking. Among them, the gluing treatment of the VH pin increases the process procedures and is not convenient for the production of the AC-DC power module; adding a pull-down grounding resistor to the VH pin can reduce the voltage of the VH pin, but the external AC power supply still continues to discharge through the pull-down grounding resistor, which increases the standby power consumption of the AC-DC power module. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a power startup circuit and a power module, aiming to improve the reliability of a power chip and reduce the standby power consumption of the power module.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a power startup circuit, which is applied to a power module, and the power startup circuit includes:

[0007] A power chip, including a VH pin, which is used to connect an external power supply based on the VH pin to start the power module when the power chip is not connected to a working power supply;

[0008] A switch module, disposed between the external power source and the VH pin, for controlling a connection relationship between the external power source and the VH pin based on an on / off state of the switch module;

[0009] A control module, connected to the switch module, and used to control the switch module to be cut off after being connected to the working power supply;

[0010] Wherein, the power supply module is used to generate the working power supply.

[0011] In some embodiments, the power startup circuit further comprises:

[0012] A first resistor, wherein a first end of the first resistor is connected to the VH pin, and a second end of the first resistor is connected to a ground terminal.

[0013] In some embodiments, the switch module includes:

[0014] a second resistor, wherein a first end of the second resistor is connected to the external power supply;

[0015] The first switch element is disposed between the second end of the second resistor and the VH pin, and is used to control the connection relationship between the external power supply and the VH pin based on the on-off state of the first switch element.

[0016] In some embodiments, the control module comprises:

[0017] a second switch element, connected to the first switch element, and configured to control the first switch element to be turned off based on the second switch element being turned on;

[0018] A controller is connected to the second switch element, and after the controller is connected to the working power supply, it is used to control the second switch element to conduct.

[0019] In some embodiments, the switch module further comprises:

[0020] a third resistor, a first end of the third resistor being connected to the first driving power source;

[0021] The first switching element comprises:

[0022] A normally closed optocoupler, wherein the first input end of the normally closed optocoupler is connected to the second end of the third resistor, the second input end of the normally closed optocoupler is connected to the ground end via the second switch element, the first output end of the normally closed optocoupler is connected to the second end of the second resistor, the second output end of the normally closed optocoupler is connected to the VH pin, and when power is supplied between the input ends of the normally closed optocoupler, power is cut off between the output ends of the normally closed optocoupler.

[0023] In some embodiments, the second switching element comprises:

[0024] A first transistor, wherein the collector of the first transistor is connected to the second input end of the normally closed optocoupler, the emitter of the first transistor is connected to the ground end, and the base of the first transistor is connected to the controller.

[0025] In some embodiments, the switch module further comprises:

[0026] a fourth resistor, wherein a first end of the fourth resistor is connected to the ground end;

[0027] The first switching element comprises:

[0028] A PMOS tube, a source of the PMOS tube is connected to the second end of the second resistor, a drain of the PMOS tube is connected to the VH pin, and a gate of the PMOS tube is connected to the second end of the fourth resistor.

[0029] In some embodiments, the control module further comprises:

[0030] a fifth resistor, wherein a first end of the fifth resistor is connected to a second driving power source;

[0031] The second switching element comprises:

[0032] A second transistor, wherein the collector of the second transistor is connected to the second end of the fifth resistor, the emitter of the second transistor is connected to the gate of the PMOS tube, and the base of the second transistor is connected to the controller.

[0033] In some embodiments, the power chip further includes:

[0034] A VCC pin, the VCC pin is used to access the working power supply;

[0035] A third switch element, the third switch element is arranged between the VH pin and the VCC pin;

[0036] Wherein, the power chip is configured as follows: after the VCC pin is connected to the working power supply, the third switch element is controlled to be turned off.

[0037] In a second aspect, an embodiment of the present application provides a power supply module, which is used to generate a working power supply, including: a power supply startup circuit as described in the first aspect.

[0038] The present application provides a power startup circuit applied to a power module, and the power startup circuit includes: a power chip, a switch module and a control module. The power chip includes a VH pin. When the power chip is not connected to the working power supply, it is used to connect the external power supply based on the VH pin to start the power module; the switch module is arranged between the external power supply and the VH pin, and is used to control the connection relationship between the external power supply and the VH pin based on the on-off state of the switch module; the control module is connected to the switch module, and is used to control the switch module to be cut off after the working power supply is connected. Among them, the power module is used to generate a working power supply. In the embodiment of the present application, a switch module is arranged between the external power supply and the VH pin of the power chip. After the power module generates the working power supply, the control module controls the switch module to be cut off, disconnects the connection between the external power supply and the power chip, reduces the voltage difference between the VH pin and the adjacent pin, and the external power supply will not continuously discharge the peripheral circuit, reducing the risk of ignition of the power chip and the standby power consumption of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of a power startup circuit according to an embodiment of the present application;

[0040] Figure 2 It is a structural schematic diagram of a power supply starting circuit in the related art;

[0041] Figure 3 This is a schematic diagram of the structure of a power startup circuit in another embodiment of the present application;

[0042] Figure 4 This is a structural schematic diagram of a power startup circuit in another embodiment of the present application;

[0043] Figure 5 This is a structural schematic diagram of a power startup circuit in yet another embodiment of the present application;

[0044] Figure 6 This is a schematic diagram of the structure of a power module in an application example of this application;

[0045] Figure 7 This is a schematic diagram of the structure of a power module in another application example of the present application.

[0046] Description of reference numerals:

[0047] 1. Power chip; 100. Power startup circuit; 2. Switch module; 21. First switch element;

[0048] 200, control circuit; 3, control module; 31, second switch element; 32, controller;

[0049] 300. Transformer. DETAILED DESCRIPTION

[0050] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0052] The present application embodiment discloses a power startup circuit, which is applied to a power module, such as Figure 1 As shown, the power startup circuit includes: a power chip 1, a switch module 2 and a control module 3. The power chip 1 includes a VH pin. When the power chip 1 is not connected to the working power supply, it is used to connect the external power supply based on the VH pin to start the power module. The switch module 2 is arranged between the external power supply and the VH pin, and is used to control the connection relationship between the external power supply and the VH pin based on the on-off state of the switch module 2. The control module 3 is connected to the switch module 2, and is used to control the switch module 2 to be turned off after the working power supply is connected.

[0053] Here, the power module is applied to the electronic device and is used to generate working power for the electronic control system of the electronic device after the electronic device is powered on.

[0054] It should be noted that the power module requires a working power supply to operate, but the working power supply cannot be generated before the power module is started. The power startup circuit of the embodiment of the present application is used to generate a temporary startup power supply based on the connected external power supply to start the power module.

[0055] Here, the external power source connected to the power chip 1 may be a power supply of an electronic device.

[0056] In some embodiments, the external power source is an external AC power source, and the power chip 1 is an AC-DC power conversion chip.

[0057] Exemplarily, the power chip 1 further includes a VCC pin and a third switch element (not shown in the figure). The VCC pin is used to access the working power supply. The third switch element is arranged between the VH pin and the VCC pin.

[0058] The power chip 1 is configured as follows: after the VCC pin is connected to the working power supply, the third switch element is controlled to be turned off.

[0059] It should be noted that the third switching element is a switching tube inside the power chip 1. Before the power module is started, the external power supply is connected to the power chip 1 through the VH pin. At this time, the third switching element is turned on, and a temporary working power supply is generated inside the power chip 1 to control the power module to start; after the power module is started, the external working power supply is supplied to the power chip 1 through the VCC pin. At this time, the power chip 1 does not need an external power supply to provide a temporary working power supply, and the third switching element is controlled to be cut off, and the external power supply is no longer connected to the power chip 1.

[0060] It should be noted that after the power module is started, the third switch element is turned off, the VH pin of the power chip 1 is suspended, the voltage of the VH pin is equal to the voltage of the external power supply, and the voltage of the VCC pin is the working voltage of the power chip. Since the electrical gap between the VH pin of the power chip and the adjacent pin is small, for example, the electrical gap between the VH pin and the VCC pin of the BM1Q series power chip is only 1.88mm, the voltage difference between the two pins is large, and there is a risk of sparking.

[0061] It should be noted that in the related art, in order to reduce the risk of sparking of the VH pin of the power chip, the VH pin is usually treated with glue to increase the sparking voltage of the VH pin, but the glue treatment will increase the process procedures and is not convenient for the production of the power module.

[0062] Here, if Figure 2 As shown, in the related art, the method of adding a pull-down grounding resistor to the VH pin is usually adopted to reduce the ignition risk of the VH pin. Among them, the resistor R21 is the current limiting resistor for the external power supply to be connected to the VH pin, and the resistor R22 is the pull-down grounding resistor. Before the power module is started, the external power supply is connected to the power chip through the resistor R21; after the power supply is started, the switch tube inside the power chip is cut off, and the resistor R22 pulls the voltage of the VH pin down to a lower voltage, reducing the voltage difference between the VH pin and the adjacent pin, thereby reducing the ignition risk.

[0063] It should be noted that although the risk of ignition can be reduced by increasing the pull-down grounding resistance, after the power module is started, the external power supply continues to discharge through resistors R21 and R22, and the standby power consumption of the power module exceeds 1W, which cannot meet the standby power consumption requirement of the power module and is not conducive to energy saving and consumption reduction.

[0064] Here, before the power module is started, the switch module 2 of the embodiment of the present application is turned on, and the external power supply is connected to the power chip 1.

[0065] It can be understood that the power startup circuit of the embodiment of the present application sets a switch module 2 between the external power supply and the VH pin of the power chip, and the on-off state of the switch module 2 is controlled by the control module 3; after the power module is started, the generated working power is connected to the control module 3. After the control module 3 is connected to the working power, the switch module 2 is controlled to be cut off. At this time, the external power supply is electrically disconnected from the power chip 1, and the external power supply will not continue to discharge the peripheral circuit of the power chip 1, which reduces the risk of ignition of the power chip 1 while reducing the standby function of the power module.

[0066] Exemplarily, the power startup circuit further includes a first resistor R1. A first end of the first resistor R1 is connected to the VH pin, and a second end of the first resistor R1 is connected to the ground terminal.

[0067] Here, the pull-down grounding resistor of the first resistor R1 is used to pull down the voltage of the VH pin to a lower voltage, further reducing the risk of ignition.

[0068] For example, Figure 3 As shown, the switch module 2 includes: a second resistor R2 and a first switch element 21. The first end of the second resistor R2 is connected to the external power supply. The first switch element 21 is arranged between the second end of the second resistor R2 and the VH pin, and is used to control the connection relationship between the external power supply and the VH pin based on the on-off state of the first switch element 21.

[0069] Exemplarily, the control module 3 includes: a second switch element 31 and a controller 32. The second switch element 31 is connected to the first switch element 21, and is used to control the first switch element 21 to be turned off based on the second switch element 31 being turned on. The controller 32 is connected to the second switch element 31, and after the controller 32 is connected to the working power supply, it is used to control the second switch element 31 to be turned on.

[0070] Here, the second resistor R2 is a current limiting resistor, and the external power source is connected to the power chip 1 after being current-limited and voltage-limited by the second resistor R2.

[0071] It can be understood that before the power module is started, the controller 32 is in a shutdown state, at which time the second switch element 31 is turned off and the first switch element 21 is turned on; after the power module is started, the controller 32 is connected to the working power supply, and after the controller 32 is started, the second switch element 32 is controlled to be turned on, and then the first switch element 21 is controlled to be turned off, thereby disconnecting the electrical connection between the external power supply and the power chip 1.

[0072] Here, the controller 32 can be a digital signal processor (DSP), a programmable logic device (PLD), a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a general processor, a controller, a microcontroller (MCU), a microprocessor (Microprocessor) or an electronic component, and the embodiments of the present application do not make specific limitations.

[0073] Based on the structure of the power startup circuit described above, the present application provides two specific embodiments to further illustrate the power startup circuit.

[0074] Embodiment 1

[0075] In this embodiment, Figure 4 As shown, the switch module 2 also includes a third resistor R3. The first end of the third resistor R3 is connected to the first driving power supply. The first switch element 21 includes a normally closed optocoupler OC, the first input end of the normally closed optocoupler OC is connected to the second end of the third resistor R3, the second input end of the normally closed optocoupler OC is connected to the ground end via the second switch element 31, the first output end of the normally closed optocoupler OC is connected to the second end of the second resistor R2, the second output end of the normally closed optocoupler OC is connected to the VH pin, and when the input ends of the normally closed optocoupler OC are powered on, the output ends of the normally closed optocoupler OC are cut off.

[0076] In this embodiment, the second switch element 31 includes a first transistor Q1 , the collector of which is connected to the second input terminal of the normally closed optocoupler OC, the emitter of which is connected to the ground terminal, and the base of which is connected to the controller 32 .

[0077] It should be noted that the first driving power supply is a driving power supply of a normally closed optocoupler OC, and after the power supply module is started, it is also used to generate the first driving power supply.

[0078] In an application example of the present application, the first driving power supply is DC5V.

[0079] It can be understood that when the controller 32 is in the shutdown state, the collector and emitter of the first transistor Q1 are cut off, and the power module does not generate the first driving power supply, the input ends of the normally closed optocoupler OC are not energized, and the output ends of the normally closed optocoupler OC are conductive. At this time, the external power supply is connected to the VH pin of the power chip 1 through the second resistor R2, the power chip 1 works, and the control power module starts; after the power module is started, the power module generates a working power supply and a first driving power supply, and the controller 32 controls the collector and emitter of the first transistor Q1 to be conductive, and the first driving power supply discharges the third resistor R3. At this time, the input ends of the normally closed optocoupler OC are energized, the output ends of the normally closed optocoupler OC are cut off, and the external power supply is electrically disconnected from the power chip 1.

[0080] It is understandable that after the power module is started, the first driving power supply continuously discharges the third resistor R3. Since the voltage of the first driving power supply is relatively low, the standby power consumption of the power module can be ignored at this time.

[0081] Embodiment 2

[0082] In this embodiment, Figure 5 As shown, the switch module 2 also includes a fourth resistor R4. A first end of the fourth resistor R4 is connected to the ground. The first switch element 21 includes a PMOS tube Q2. A source of the PMOS tube Q2 is connected to the second end of the second resistor R2, a drain of the PMOS tube Q2 is connected to the VH pin, and a gate of the PMOS tube Q2 is connected to the second end of the fourth resistor R4.

[0083] In this embodiment, the control module 3 further includes a fifth resistor R5, a first end of the fifth resistor R5 is connected to the second driving power supply. The second switch element 31 includes a second triode Q3. The collector of the second triode Q3 is connected to the second end of the fifth resistor R5, the emitter of the second triode Q3 is connected to the gate of the PMOS tube Q2, and the base of the second triode Q3 is connected to the controller 32.

[0084] It should be noted that the second driving power source is the driving power source of the PMOS tube Q2, and after the power module is started, it is also used to generate the second driving power source.

[0085] In an application example of the present application, the first driving power supply is DC15V.

[0086] Here, a first end of the fourth resistor R4 is connected to the ground, and a second end of the first resistor R1 is connected to the ground. The fourth resistor R4 is used to increase the voltage difference between the gate and the drain of the PMOS transistor Q2.

[0087] It can be understood that when the controller 32 is in the shutdown state, the collector and emitter of the second transistor Q3 are cut off, and the power module does not generate the second driving power supply, the gate of the PMOS tube Q2 is at a low level, and the source and drain of the PMOS tube Q2 are connected. At this time, the external power supply is connected to the VH pin of the power chip 1 through the second resistor R2, the power chip 1 works, and the control power module starts; after the power module is started, the power module generates a working power supply and a second driving power supply, and the controller 32 controls the collector and emitter of the second transistor Q3 to be connected, and the second driving power supply discharges the third resistor R3 and the fifth resistor R5. At this time, the gate of the PMOS tube Q2 is at a high level, the source and drain of the PMOS tube Q2 are cut off, and the external power supply is electrically disconnected from the power chip 1.

[0088] The embodiment of the present application also provides a power supply module, which is used to generate a working power supply, including the power supply startup circuit mentioned above in the embodiment of the present application.

[0089] Here, the power module of the embodiment of the present application is applied to an electronic device. When the electronic device is powered on, the power module is connected to the power supply of the electronic device and starts up, and generates a working power supply for powering the electronic control system (including the power module) of the electronic device.

[0090] Based on the structure of the power module described above, the present application provides two application examples to further illustrate the power module.

[0091] Application Example 1

[0092] like Figure 6 As shown, the power module includes a power startup circuit 100, a control circuit 200 and a transformer 300. Among them, the control circuit 200 includes an NMOS tube Q4, the gate of the NMOS tube Q4 is connected to the output OUT pin of the power chip 1 through a resistor R6, the source of the NMOS tube Q4 is connected to the ground terminal through a resistor R7, the drain of the NMOS tube Q4 is connected to the main winding of the transformer 300, and a resistor R8 is set between the source and the gate of the NMOS tube Q4. When the external power supply is connected to the power module, the power chip 1 works, controls the NMOS tube Q4 to be turned on, and the external power is transformed through the transformer 300 to generate a low-voltage power supply in the auxiliary winding of the transformer 300. The low-voltage power supply is stored through the resistor R9 and the diode D1 and the capacitor C2 and the polar capacitor E1 to generate a working power supply. The control circuit 200 also includes a resistor R10, a capacitor C2 and a diode D2, which are used to absorb the impact voltage generated when the NMOS tube Q4 is turned off; the control circuit 200 also includes a resistor R11 and a diode D3 for protection.

[0093] It can be understood that the power startup circuit 100 includes a normally closed optocoupler OC and a first transistor D1. After the working power is generated, the power chip 1 and the controller 32 are powered through the VCC pin. The power chip 1 disconnects the internal third switch element, and the controller 3 controls the first transistor D1 to turn on, thereby controlling the normally closed optocoupler OC to cut off. At this time, the external power supply and the VH pin are disconnected, and the external power supply is prevented from continuously discharging the power module.

[0094] Application Example 2

[0095] like Figure 7 As shown, the power module includes a power startup circuit 100, a control circuit 200 and a transformer 300. Among them, the control circuit 200 includes an NMOS tube Q4, the gate of the NMOS tube Q4 is connected to the output OUT pin of the power chip 1 through a resistor R6, the source of the NMOS tube Q4 is connected to the ground terminal through a resistor R7, the drain of the NMOS tube Q4 is connected to the main winding of the transformer 300, and a resistor R8 is set between the source and the gate of the NMOS tube Q4. When the external power supply is connected to the power module, the power chip 1 works, controls the NMOS tube Q4 to be turned on, and the external power is transformed through the transformer 300 to generate a low-voltage power supply in the auxiliary winding of the transformer 300. The low-voltage power supply is stored through the resistor R9 and the diode D1 and the capacitor C2 and the polar capacitor E1 to generate a working power supply. The control circuit 200 also includes a resistor R10, a capacitor C2 and a diode D2, which are used to absorb the impact voltage generated when the NMOS tube Q4 is turned off; the control circuit 200 also includes a resistor R11 and a diode D3 for protection.

[0096] It can be understood that the power startup circuit 100 includes a PMOS tube Q2 and a second transistor Q3. After the working power is generated, the power chip 1 and the controller 32 are powered through the VCC pin. The power chip 1 disconnects the internal third switch element, and the controller 3 controls the second transistor Q3 to turn on, thereby controlling the PMOS tube Q2 to turn off. At this time, the external power supply and the VH pin are disconnected, and the external power supply is prevented from continuously discharging the power module.

[0097] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0098] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0099] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power startup circuit, characterized in that: Applied to a power module, the power startup circuit includes: A power chip, including a high voltage VH pin, which is used to connect an external power supply based on the VH pin to start the power module when the power chip is not connected to a working power supply; A switch module, disposed between the external power source and the VH pin, for controlling a connection relationship between the external power source and the VH pin based on an on / off state of the switch module; A control module, connected to the switch module, and used to control the switch module to be cut off after being connected to the working power supply; Wherein, the power supply module is used to generate the working power supply.

2. The power startup circuit according to claim 1, characterized in that: The power startup circuit also includes: A first resistor, wherein a first end of the first resistor is connected to the VH pin, and a second end of the first resistor is connected to a ground terminal.

3. The power startup circuit according to claim 1, characterized in that: The switch module comprises: a second resistor, wherein a first end of the second resistor is connected to the external power supply; The first switch element is disposed between the second end of the second resistor and the VH pin, and is used to control the connection relationship between the external power supply and the VH pin based on the on-off state of the first switch element.

4. The power startup circuit according to claim 3, characterized in that: The control module comprises: a second switch element, connected to the first switch element, and configured to control the first switch element to be turned off based on the second switch element being turned on; A controller is connected to the second switch element, and after the controller is connected to the working power supply, it is used to control the second switch element to conduct.

5. The power startup circuit according to claim 4, characterized in that: The switch module also includes: a third resistor, a first end of the third resistor being connected to the first driving power source; The first switching element comprises: A normally closed optocoupler, wherein the first input end of the normally closed optocoupler is connected to the second end of the third resistor, the second input end of the normally closed optocoupler is connected to the ground end via the second switch element, the first output end of the normally closed optocoupler is connected to the second end of the second resistor, the second output end of the normally closed optocoupler is connected to the VH pin, and when power is supplied between the input ends of the normally closed optocoupler, power is cut off between the output ends of the normally closed optocoupler.

6. The power startup circuit according to claim 5, characterized in that: The second switching element comprises: A first transistor, wherein the collector of the first transistor is connected to the second input end of the normally closed optocoupler, the emitter of the first transistor is connected to the ground end, and the base of the first transistor is connected to the controller.

7. The power startup circuit according to claim 4, characterized in that: The switch module also includes: a fourth resistor, wherein a first end of the fourth resistor is connected to the ground end; The first switching element comprises: A PMOS tube, a source of the PMOS tube is connected to the second end of the second resistor, a drain of the PMOS tube is connected to the VH pin, and a gate of the PMOS tube is connected to the second end of the fourth resistor.

8. The power startup circuit according to claim 7, characterized in that: The control module also includes: a fifth resistor, wherein a first end of the fifth resistor is connected to a second driving power source; The second switching element comprises: A second transistor, wherein the collector of the second transistor is connected to the second end of the fifth resistor, the emitter of the second transistor is connected to the gate of the PMOS tube, and the base of the second transistor is connected to the controller.

9. The power startup circuit according to claim 1, characterized in that: The power chip also includes: A working voltage VCC pin, wherein the VCC pin is used to connect to the working power supply; A third switch element, the third switch element is arranged between the VH pin and the VCC pin; Wherein, the power chip is configured as follows: after the VCC pin is connected to the working power supply, the third switch element is controlled to be turned off.

10. A power module, characterized in that: The power supply module is used to generate a working power supply, and includes: a power supply startup circuit as described in any one of claims 1 to 9.

Images