AC / DC power supply module

Abstract

The utility model relates to an AC / DC power supply module, which comprises a main loop, an auxiliary power supply circuit, a switching circuit, a driving circuit and a control circuit, the main loop is connected with the auxiliary power supply circuit, the switching circuit and the driving circuit, and the control circuit is connected with the auxiliary power supply circuit and the switching circuit; a DSP is adopted for control, a boost circuit and an LLC circuit can be controlled respectively, meanwhile, multiple voltage, current and temperature sampling positions are set, and various faults can be fed back and maintained in time; the LLC circuit is simple in structure, improves the working efficiency through resonance, and is smaller in size, lighter in weight, higher in efficiency and lower in cost compared with an original power module.

Description

Technical Field

[0001] The invention relates to a power supply module, and in particular to an AC / DC power supply module. Background Art

[0002] Since most power grids provide alternating current, and many electronic devices require stable direct current as a power source, AC / DC conversion is an indispensable process for many electronic devices and electronic systems. Existing AC / DC power supply technology usually converts AC into DC through a diode rectifier or a linear regulator. Although simple, it is not efficient and is only suitable for low-power applications. Synchronous rectification technology uses MOSFET as a rectifier device to improve efficiency and output quality, and can also be used for high-power electronic devices, but it is complex in structure and high in cost and is not suitable for large-module AC / DC power supplies. Summary of the invention

[0003] In view of this, the utility model provides an AC / DC power supply module, which effectively solves the defects of low efficiency, complex structure and high cost in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides an AC / DC power supply module, characterized in that it includes a main circuit, an auxiliary power supply circuit, a switching circuit, a drive circuit and a control circuit; the main circuit is connected to the auxiliary power supply circuit, the switching circuit and the drive circuit, and the control circuit is connected to the auxiliary power supply circuit and the switching circuit.

[0005] Preferably, the main circuit includes a first fuse F1, a second fuse F2, a first resistor R8, a second resistor R20, a third resistor R24, a fourth resistor R27, a fifth resistor R28, a sixth resistor R36, a first diode group D4, a first capacitor C22, a second capacitor C41, and a third capacitor C1, the first fuse F1 is connected to the second resistor R20, the second resistor R20 is connected to the first diode group D4, the second fuse F2 is connected to the first diode group D4, the first resistor R8 is connected to one end of the first diode group D4, the first diode group D4 is connected to the third resistor R24 ​​and the sixth resistor R36, and the other end of the third resistor R24 ​​is connected to the And connected to the fourth resistor R27, the other end of the fourth resistor R27 is connected to the fifth resistor R28, and the other end of the fifth resistor R28 is connected to the sixth resistor R36; one end of the first capacitor C22 is connected to the third resistor R24, the other end of the first capacitor C22 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, one end of the second capacitor C41 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, the other end of the second capacitor C41 is connected to the sixth resistor R36, and both ends of the third capacitor C1 are respectively connected to the connection point of the first capacitor C22 and the third resistor R24 ​​and the connection point of the second capacitor C41 and the sixth resistor R36.

[0006] Preferably, the main circuit further includes a first relay J6, a second relay J7, a first inductor L1, a first MOS tube Q2 and a second MOS tube Q4, one end of the first relay J6 is connected to the third capacitor C1, the other end of the first relay J6 is connected to the first inductor L1, the other end of the first inductor L1 is connected to the fourth relay J7, the other end of the fourth relay J7 is connected to the source of the first MOS tube Q2 and the drain of the second MOS tube Q4, and the source of the second MOS tube Q4 is connected to the connection point of the second capacitor C41 and the sixth resistor R36.

[0007] Preferably, the main circuit further includes a fourth capacitor C75, a fifth capacitor C12, a sixth capacitor C13, a seventh capacitor C34, an eighth capacitor C35, a third MOS tube Q3, a fourth MOS tube Q5, a third relay J4, and a fourth relay J5. The two ends of the fourth capacitor C75 are respectively connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4. The drain of the third MOS tube Q3 is connected to the connection point of the fourth capacitor C75 and the drain of the first MOS tube Q2. The source of the third MOS tube Q3 is connected to the drain of the fourth MOS tube Q5. The source of the fourth MOS tube Q5 is connected to the drain of the fourth MOS tube Q5. The fourth capacitor C75 is connected to the connection point of the source of the second MOS tube Q4, one end of the fifth capacitor C12 is connected to the drain of the third MOS tube Q3, the other end of the fifth capacitor C12 is connected in series with the sixth capacitor C13, one end of the seventh capacitor C34 is connected to the source of the fourth MOS tube, the other end of the seventh capacitor C34 is connected in series with the eighth capacitor C35, one end of the third relay J4 is connected to the connection point of the sixth capacitor C13 and the eighth capacitor C35, and one end of the fourth relay J5 is connected to the connection point of the source of the third MOS tube Q3 and the drain of the fourth MOS tube Q5.

[0008] Preferably, the main circuit also includes a transformer T1, and the transformer T1 internally includes a second inductor L2, a primary coil, and a secondary coil, one end of the second inductor L2 is connected to the third relay J4, the other end of the second inductor L2 is connected to one end of the primary coil, and the other end of the primary coil is connected to the fourth relay J5.

[0009] Preferably, the main circuit further includes a fifth relay J15, a sixth relay J9, a seventh relay J10, an eighth relay J11, a ninth relay J12, a second diode group D1, a ninth capacitor C102, and a tenth capacitor C104, one end of the fifth relay J15 is connected to the secondary coil XT3 end of the transformer, one end of the sixth relay J9 is connected to the secondary coil XT5 end of the transformer, the other ends of the fifth relay J15 and the sixth relay J9 are connected to the second diode group D1, one end of the seventh relay J10 is connected to the secondary coil XT4 end of the transformer, the ninth capacitor C102 and the tenth capacitor C104 are connected to the secondary coil XT5 end of the transformer, C104 are connected in parallel, the other end of the seventh relay J10 is connected to a connection point of the ninth capacitor C102 and the tenth capacitor C104, the other connection point of the ninth capacitor C102 and the tenth capacitor C104 is connected to the second diode group D1, one end of the eighth relay J11 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the second diode group D1, one end of the ninth relay J12 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the seventh relay J10, and the other ends of the eighth relay J11 and the ninth relay J12 are connected to the DC voltage output.

[0010] Preferably, the main circuit further includes a tenth relay J1, an eleventh relay J2, and a twelfth relay J3, one end of the tenth relay J1 is connected to the first fuse F1, the eleventh relay J2 is connected to one end of the first resistor R8, one end of the twelfth relay J3 is connected to the second fuse F2, and the other ends of the tenth relay J1, the eleventh relay J2, and the twelfth relay J3 are connected to the AC power input.

[0011] Preferably, the auxiliary power supply circuit is connected to the first fuse F1 and the second fuse F2, the switching circuit is connected to the contactor KM1, the contactor KM1 is connected in parallel with the second resistor R20 and the first resistor R8 through two switches, the switching circuit is connected to both ends of the third capacitor C1 for bus voltage sampling, the switching circuit is connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4 for boosted voltage sampling, and the switching circuit is connected to the two connection points of the ninth capacitor C102 and the tenth capacitor C104 for output voltage sampling.

[0012] Preferably, the driving circuit includes an A3 driving circuit board and an A4 driving circuit board, the four ports of the A3 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the first MOS tube Q2 and the gate of the second MOS tube Q4, and the four ports of the A4 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the third MOS tube Q3 and the gate of the fourth MOS tube Q5.

[0013] Preferably, the control circuit comprises an A2 control board, and the A2 control board is connected to the auxiliary power supply circuit and the switching circuit through two ports.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The power module is controlled by DSP, which can control the boost and LLC circuits respectively. At the same time, multiple voltage, current and temperature sampling are set, which can provide feedback and repairs on various faults in time.

[0016] 2. The power module adopts LLC circuit with simple structure and improves working efficiency through resonance.

[0017] 3. Compared with existing power modules, it is smaller in size, lighter in weight, more efficient and less expensive.

[0018] 4. Multiple power modules can be used in parallel and exchange data through CAN. Even if one module is not started or fails, it will not affect the normal operation of the remaining modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is an electrical principle block diagram of an AC / DC power supply module described in the utility model;

[0021] Figure 2 This is a diagram of multiple AC / DC power supply modules described in the utility model being used in parallel. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0023] This embodiment provides the following technical solutions:

[0024] like Figure 1 The utility model shown provides an AC / DC power supply module, which rectifies and boosts single-phase 396V AC power (also compatible with three-phase AC 440V input) to convert it into a stable target DC voltage, and then isolates it through an LLC isolation circuit and outputs a stable DC 110V output voltage.

[0025] An AC / DC power supply module comprises a main circuit, an auxiliary power supply circuit, a switching circuit, a drive circuit and a control circuit; the main circuit is connected with the auxiliary power supply circuit, the switching circuit and the drive circuit, and the control circuit is connected with the auxiliary power supply circuit and the switching circuit.

[0026] The main circuit includes a first fuse F1, a second fuse F2, a first resistor R8, a second resistor R20, a third resistor R24, a fourth resistor R27, a fifth resistor R28, a sixth resistor R36, a first diode group D4, a first capacitor C22, a second capacitor C41, and a third capacitor C1. The first fuse F1 is connected to the second resistor R20, the second resistor R20 is connected to the first diode group D4, the second fuse F2 is connected to the first diode group D4, the first resistor R8 is connected to one end of the first diode group D4, the first diode group D4 is connected to the third resistor R24 ​​and the sixth resistor R36, and the other end of the third resistor R24 ​​is connected to the first diode group D4. The four resistors R27 are connected, the other end of the fourth resistor R27 is connected to the fifth resistor R28, and the other end of the fifth resistor R28 is connected to the sixth resistor R36; one end of the first capacitor C22 is connected to the third resistor R24, the other end of the first capacitor C22 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, one end of the second capacitor C41 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, the other end of the second capacitor C41 is connected to the sixth resistor R36, and both ends of the third capacitor C1 are respectively connected to the connection point of the first capacitor C22 and the third resistor R24 ​​and the connection point of the second capacitor C41 and the sixth resistor R36.

[0027] The main circuit also includes a first relay J6, a second relay J7, a first inductor L1, a first MOS transistor Q2 and a second MOS transistor Q4. One end of the first relay J6 is connected to the third capacitor C1, the other end of the first relay J6 is connected to the first inductor L1, the other end of the first inductor L1 is connected to the fourth relay J7, the other end of the fourth relay J7 is connected to the source of the first MOS transistor Q2 and the drain of the second MOS transistor Q4, and the source of the second MOS transistor Q4 is connected to the connection point of the second capacitor C41 and the sixth resistor R36.

[0028] The main circuit also includes a fourth capacitor C75, a fifth capacitor C12, a sixth capacitor C13, a seventh capacitor C34, an eighth capacitor C35, a third MOS tube Q3, a fourth MOS tube Q5, a third relay J4, and a fourth relay J5. The two ends of the fourth capacitor C75 are respectively connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4. The drain of the third MOS tube Q3 is connected to the connection point of the fourth capacitor C75 and the drain of the first MOS tube Q2. The source of the third MOS tube Q3 is connected to the drain of the fourth MOS tube Q5. The source of the fourth MOS tube Q5 is connected to the The fourth capacitor C75 is connected to the connection point of the source of the second MOS tube Q4, one end of the fifth capacitor C12 is connected to the drain of the third MOS tube Q3, the other end of the fifth capacitor C12 is connected in series with the sixth capacitor C13, one end of the seventh capacitor C34 is connected to the source of the fourth MOS tube, the other end of the seventh capacitor C34 is connected in series with the eighth capacitor C35, one end of the third relay J4 is connected to the connection point of the sixth capacitor C13 and the eighth capacitor C35, and one end of the fourth relay J5 is connected to the connection point of the source of the third MOS tube Q3 and the drain of the fourth MOS tube Q5.

[0029] The main circuit also includes a transformer T1, which includes a second inductor L2, a primary coil, and a secondary coil. One end of the second inductor L2 is connected to the third relay J4, the other end of the second inductor L2 is connected to one end of the primary coil, and the other end of the primary coil is connected to the fourth relay J5.

[0030] The main circuit also includes a fifth relay J15, a sixth relay J9, a seventh relay J10, an eighth relay J11, a ninth relay J12, a second diode group D1, a ninth capacitor C102, and a tenth capacitor C104. One end of the fifth relay J15 is connected to the secondary coil XT3 end of the transformer, one end of the sixth relay J9 is connected to the secondary coil XT5 end of the transformer, the other ends of the fifth relay J15 and the sixth relay J9 are connected to the second diode group D1, one end of the seventh relay J10 is connected to the secondary coil XT4 end of the transformer, the ninth capacitor C102 and the tenth capacitor C104 are connected to the secondary coil XT5 end of the transformer, The seventh relay J10 is connected in parallel, the other end of the seventh relay J10 is connected to a connection point of the ninth capacitor C102 and the tenth capacitor C104, the other connection point of the ninth capacitor C102 and the tenth capacitor C104 is connected to the second diode group D1, one end of the eighth relay J11 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the second diode group D1, one end of the ninth relay J12 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the seventh relay J10, and the other ends of the eighth relay J11 and the ninth relay J12 are connected to the DC voltage output.

[0031] The main circuit also includes a tenth relay J1, an eleventh relay J2, and a twelfth relay J3. One end of the tenth relay J1 is connected to the first fuse F1, the eleventh relay J2 is connected to one end of the first resistor R8, one end of the twelfth relay J3 is connected to the second fuse F2, and the other ends of the tenth relay J1, the eleventh relay J2, and the twelfth relay J3 are connected to the AC power input.

[0032] The auxiliary power supply circuit is connected to the first fuse F1 and the second fuse F2, the switching circuit is connected to the contactor KM1, the contactor KM1 is connected in parallel with the second resistor R20 and the first resistor R8 through two switches, the switching circuit is connected to both ends of the third capacitor C1 for bus voltage sampling, the switching circuit is connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4 for boosted voltage sampling, and the switching circuit is connected to the two connection points of the ninth capacitor C102 and the tenth capacitor C104 for output voltage sampling.

[0033] The driving circuit includes an A3 driving circuit board and an A4 driving circuit board. The four ports of the A3 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the first MOS tube Q2 and the gate of the second MOS tube Q4. The four ports of the A4 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the third MOS tube Q3 and the gate of the fourth MOS tube Q5.

[0034] The control circuit comprises an A2 control board, and the A2 control board is connected with an auxiliary power supply circuit and a switching circuit through two ports.

[0035] After the main circuit is connected to the single-phase or three-phase AC voltage of the external power supply, the large capacitor in the main circuit is charged first through the filter and then through the fuse through the charging resistor, and the auxiliary power supply circuit is activated at the same time. The auxiliary power supply circuit converts the rectified voltage into several stable voltages to power the control circuit and the drive circuit devices; after the control circuit is powered on, the working status of the power module is monitored. When the start-up conditions are met, the main circuit relay is first turned on, and then the drive circuit is controlled to isolate the PWM signal to provide a drive signal to the boost part and LLC part in the main circuit, and output a stable DC voltage to the LLC front end. The LLC circuit works within the range around the resonant frequency, thereby improving efficiency; through the transformer to the secondary side of the transformer, full-wave rectification is performed through the diode, and then the detector outputs the current to the connector output after filtering through the output capacitor, and the output voltage value is monitored at the same time, and the PWM signal is controlled by internal logic to adjust to a stable voltage output.

[0036] like Figure 2As shown, the AC / DC power supply module described in the utility model can realize the parallel use of multiple modules of the same model, and the modules exchange data and adjust the output through CAN, and fine-tune the output voltage value by comparing the output current values ​​of each module to achieve current sharing. When multiple AC / DC power supply modules are used in parallel, even if a module is not started, it will not affect the work of the remaining modules, and the entire power supply circuit will not be damaged due to the backflow voltage.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An AC / DC power supply module, characterized in that: It includes a main circuit, an auxiliary power supply circuit, a switching circuit, a drive circuit and a control circuit; the main circuit is connected to the auxiliary power supply circuit, the switching circuit and the drive circuit, and the control circuit is connected to the auxiliary power supply circuit and the switching circuit.

2. The AC / DC power supply module according to claim 1, characterized in that: The main circuit includes a first fuse F1, a second fuse F2, a first resistor R8, a second resistor R20, a third resistor R24, a fourth resistor R27, a fifth resistor R28, a sixth resistor R36, a first diode group D4, a first capacitor C22, a second capacitor C41, and a third capacitor C1. The first fuse F1 is connected to the second resistor R20, the second resistor R20 is connected to the first diode group D4, the second fuse F2 is connected to the first diode group D4, the first resistor R8 is connected to one end of the first diode group D4, the first diode group D4 is connected to the third resistor R24 ​​and the sixth resistor R36, and the other end of the third resistor R24 ​​is connected to the first diode group D4. The four resistors R27 are connected, the other end of the fourth resistor R27 is connected to the fifth resistor R28, and the other end of the fifth resistor R28 is connected to the sixth resistor R36; one end of the first capacitor C22 is connected to the third resistor R24, the other end of the first capacitor C22 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, one end of the second capacitor C41 is connected to the connection point of the fourth resistor R27 and the fifth resistor R28, the other end of the second capacitor C41 is connected to the sixth resistor R36, and both ends of the third capacitor C1 are respectively connected to the connection point of the first capacitor C22 and the third resistor R24 ​​and the connection point of the second capacitor C41 and the sixth resistor R36.

3. The AC / DC power supply module according to claim 2, characterized in that: The main circuit further includes a first relay J6, a second relay J7, a first inductor L1, a first MOS transistor Q2 and a second MOS transistor Q4, one end of the first relay J6 is connected to the third capacitor C1, the other end of the first relay J6 is connected to the first inductor L1, the other end of the first inductor L1 is connected to the fourth relay J7, the other end of the fourth relay J7 is connected to the source of the first MOS transistor Q2 and the drain of the second MOS transistor Q4, and the source of the second MOS transistor Q4 is connected to the connection point of the second capacitor C41 and the sixth resistor R36.

4. The AC / DC power supply module according to claim 3, characterized in that: The main circuit also includes a fourth capacitor C75, a fifth capacitor C12, a sixth capacitor C13, a seventh capacitor C34, an eighth capacitor C35, a third MOS tube Q3, a fourth MOS tube Q5, a third relay J4, and a fourth relay J5. The two ends of the fourth capacitor C75 are respectively connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4. The drain of the third MOS tube Q3 is connected to the connection point of the fourth capacitor C75 and the drain of the first MOS tube Q2. The source of the third MOS tube Q3 is connected to the drain of the fourth MOS tube Q5. The source of the fourth MOS tube Q5 is connected to the drain of the first MOS tube Q2. The fourth capacitor C75 is connected to the connection point of the source of the second MOS tube Q4, one end of the fifth capacitor C12 is connected to the drain of the third MOS tube Q3, the other end of the fifth capacitor C12 is connected in series with the sixth capacitor C13, one end of the seventh capacitor C34 is connected to the source of the fourth MOS tube, the other end of the seventh capacitor C34 is connected in series with the eighth capacitor C35, one end of the third relay J4 is connected to the connection point of the sixth capacitor C13 and the eighth capacitor C35, and one end of the fourth relay J5 is connected to the connection point of the source of the third MOS tube Q3 and the drain of the fourth MOS tube Q5.

5. The AC / DC power supply module according to claim 4, characterized in that: The main circuit also includes a transformer T1, which includes a second inductor L2, a primary coil, and a secondary coil. One end of the second inductor L2 is connected to the third relay J4, the other end of the second inductor L2 is connected to one end of the primary coil, and the other end of the primary coil is connected to the fourth relay J5.

6. The AC / DC power supply module according to claim 5, characterized in that: The main circuit also includes a fifth relay J15, a sixth relay J9, a seventh relay J10, an eighth relay J11, a ninth relay J12, a second diode group D1, a ninth capacitor C102, and a tenth capacitor C104. One end of the fifth relay J15 is connected to the secondary coil XT3 end of the transformer, one end of the sixth relay J9 is connected to the secondary coil XT5 end of the transformer, the other ends of the fifth relay J15 and the sixth relay J9 are connected to the second diode group D1, one end of the seventh relay J10 is connected to the secondary coil XT4 end of the transformer, the ninth capacitor C102 and the tenth capacitor C104 are connected to the secondary coil XT5 end of the transformer, 04 are connected in parallel, the other end of the seventh relay J10 is connected to a connection point of the ninth capacitor C102 and the tenth capacitor C104, the other connection point of the ninth capacitor C102 and the tenth capacitor C104 is connected to the second diode group D1, one end of the eighth relay J11 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the second diode group D1, one end of the ninth relay J12 is connected to the connection point of the ninth capacitor C102, the tenth capacitor C104 and the seventh relay J10, and the other ends of the eighth relay J11 and the ninth relay J12 are connected to the DC voltage output.

7. The AC / DC power supply module according to claim 6, characterized in that: The main circuit also includes a tenth relay J1, an eleventh relay J2, and a twelfth relay J3, one end of the tenth relay J1 is connected to the first fuse F1, the eleventh relay J2 is connected to one end of the first resistor R8, one end of the twelfth relay J3 is connected to the second fuse F2, and the other ends of the tenth relay J1, the eleventh relay J2, and the twelfth relay J3 are connected to the AC power input.

8. The AC / DC power supply module according to claim 1, characterized in that: The auxiliary power supply circuit is connected to the first fuse F1 and the second fuse F2, the switching circuit is connected to the contactor KM1, the contactor KM1 is connected in parallel with the second resistor R20 and the first resistor R8 through two switches, the switching circuit is connected to both ends of the third capacitor C1 for bus voltage sampling, the switching circuit is connected to the drain of the first MOS tube Q2 and the source of the second MOS tube Q4 for boosted voltage sampling, and the switching circuit is connected to two connection points of the ninth capacitor C102 and the tenth capacitor C104 for output voltage sampling.

9. The AC / DC power supply module according to claim 1, characterized in that: The driving circuit includes an A3 driving circuit board and an A4 driving circuit board. The four ports of the A3 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the first MOS tube Q2 and the gate of the second MOS tube Q4. The four ports of the A4 driving circuit board are connected to the switching circuit, the auxiliary power supply circuit, the gate of the third MOS tube Q3 and the gate of the fourth MOS tube Q5.

10. The AC / DC power supply module according to claim 1, characterized in that: The control circuit comprises an A2 control board, and the A2 control board is connected to an auxiliary power supply circuit and a switching circuit through two ports.

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