MOS tube pressure difference automatic adjustment device and method

Abstract

The present invention provides a MOS tube pressure difference automatic adjustment device and method in the field of battery formation technology, the device includes a MOS tube pressure difference detection circuit, a pressure difference comparison circuit, a window current comparison circuit, a voltage drop regulation enabling circuit, a power drive chip and an MCU; the MCU is respectively connected to the MOS tube pressure difference detection circuit, the voltage drop regulation enabling circuit, the pressure difference comparison circuit and the window current comparison circuit; the input end of the pressure difference comparison circuit is connected to the output end of the MOS tube pressure difference detection circuit, and the output end is connected to the pressure drop regulation enabling circuit; the input end of the pressure drop regulation enabling circuit is connected to the output end of the window current comparison circuit, and the output end is connected to the power drive chip. The advantage of the present invention is that it realizes adaptive adjustment of the MOS tube pressure difference, thereby greatly reducing the power consumption of the MOS tube.

Description

Technical Field

[0001] The present invention relates to the technical field of battery formation, and in particular to a device and method for automatically adjusting the pressure difference of a MOS tube. Background Art

[0002] The formation of lithium-ion batteries is the first small current charging of the manufactured lithium-ion batteries to form a passivation layer on the surface of the negative electrode, namely the solid electrolyte interface film (SEI film). During the battery formation process, that is, the process of the front-end power supply charging the battery, the battery voltage gradually rises, and the front-end power supply cannot adapt to the rise in battery voltage, resulting in the MOS tube of the front-end power supply receiving the feedback signal of the battery voltage rise. The voltage drop (voltage difference) of the MOS tube becomes smaller, and when the overall output impedance does not change much, the load capacity of the front-end power supply output decreases, increasing the output power consumption and the heat generated.

[0003] Therefore, how to provide a MOS tube pressure difference automatic adjustment device and method to achieve adaptive adjustment of the MOS tube pressure difference and thus reduce the MOS tube power consumption has become an urgent problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a MOS tube pressure difference automatic adjustment device and method, so as to realize adaptive adjustment of the MOS tube pressure difference and thus reduce the power consumption of the MOS tube.

[0005] In a first aspect, the present invention provides a MOS tube pressure difference automatic adjustment device, comprising a MOS tube pressure difference detection circuit, a pressure difference comparison circuit, a window current comparison circuit, a voltage drop adjustment enabling circuit, a power drive chip and an MCU;

[0006] The MCU is respectively connected to the MOS tube voltage difference detection circuit, the voltage drop regulation enabling circuit, the voltage difference comparison circuit and the window current comparison circuit; the input end of the voltage difference comparison circuit is connected to the output end of the MOS tube voltage difference detection circuit, and the output end is connected to the voltage drop regulation enabling circuit; the input end of the voltage drop regulation enabling circuit is connected to the output end of the window current comparison circuit, and the output end is connected to the power drive chip.

[0007] Furthermore, the MOS tube voltage difference detection circuit includes an operational amplifier U1B, a resistor R1, a resistor R2, a resistor R3, a resistor R7 and a resistor R8;

[0008] Pin 5 of the operational amplifier U1B is connected to resistors R2 and R7, pin 6 is connected to resistors R1 and R3, pin 7 is connected to resistors R3, R8, a voltage difference comparison circuit and MCU; the resistor R7 is grounded; and the resistor R2 is connected to the MCU.

[0009] Further, the voltage difference comparison circuit includes an operational amplifier U1A, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1;

[0010] Pin 1 of the operational amplifier U1A is connected to the resistor R6 and the voltage drop adjustment enabling circuit, pin 2 is connected to the resistor R4, and pin 3 is connected to the resistor R5 and the capacitor C1; the resistor R6 and the capacitor C1 are both grounded; the resistor R5 is connected to the MOS tube voltage difference detection circuit; the resistor R4 is connected to the MCU.

[0011] Further, the window current comparison circuit includes an operational amplifier U3, a diode D2, a light emitting diode LED2, a resistor R15, a resistor R16 and a resistor R20;

[0012] Pin 1 of the operational amplifier U3 is connected to the input end of the diode D2 and the light-emitting diode LED2, pin 3 is connected to the resistor R16 and the resistor R20, and pin 4 is connected to the resistor R15; the resistor R20 is connected to the output end of the diode D2; the output end of the light-emitting diode LED2 is connected to the voltage drop regulation enabling circuit; the resistor R15 is connected to the MCU.

[0013] Further, the voltage drop regulation enabling circuit includes an optocoupler U4, a MOS tube Q1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R17, a capacitor C2, a capacitor C3 and a capacitor C4;

[0014] Pin 1 of the optical coupler U4 is connected to resistors R11 and R12, pin 2 is connected to resistor R12 and grounded, pin 3 is connected to a voltage difference comparison circuit, and pin 4 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to resistors R13, R14 and capacitor C2, and the source is connected to capacitor C2 and resistor R14 and grounded; the resistor R13 is connected to a window current comparison circuit;

[0015] The resistor R11 is connected to the resistor R17, the resistor R9, the resistor R10 and the capacitor C3; one end of the capacitor C4 is connected to the capacitor C3 and the resistor R17 and grounded, and the other end is connected to the resistor R9 and the power driver chip; the resistor R10 is connected to the MCU.

[0016] In a second aspect, the present invention provides a method for automatically adjusting a MOS tube pressure difference, comprising the following steps:

[0017] Step S10, the MOS tube voltage difference detection circuit collects the front-end voltage value FB_VOUT of the MOS tube in the front-end power supply, subtracts the back-end voltage value VF_MOS fed back by the MCU from the front-end voltage value FB_VOUT, obtains the voltage difference value FV_DEF and inputs it into the voltage difference comparison circuit and the MCU;

[0018] Step S20, the voltage difference comparison circuit subtracts the protection voltage difference control value VDEF_SET set by the MCU from the voltage difference value FV_DEF to obtain a trigger signal CONB, and inputs the trigger signal CONB into the voltage drop adjustment enabling circuit;

[0019] Step S30, the window current comparison circuit collects the output current value FB_IOUT of the front-end power supply, subtracts the current standard value ICON_SET set by the MCU from the output current value FB_IOUT to obtain a trigger signal CONA, and inputs the trigger signal CONA into the voltage drop adjustment enabling circuit;

[0020] Step S40, the voltage drop adjustment enabling circuit enables the optical coupler U4 to work based on the trigger signal CONA and the trigger signal CONB, adjusts the front-end voltage output value V_SET and inputs it into the MCU, and adjusts the voltage division value V_SET_F and inputs it into the power driver chip;

[0021] Step S50, the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube voltage difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage division value V_SET_F to complete the adjustment of the MOS tube voltage difference of the front-end power supply.

[0022] Furthermore, the step S30 is specifically as follows:

[0023] The window current comparison circuit collects the output current value FB_IOUT of the front-end power supply, and determines whether the output current value FB_IOUT is less than the current standard value ICON_SET set by the MCU. If so, a low-level trigger signal CONA is output to the voltage drop adjustment enabling circuit; if not, a high-level trigger signal CONA is output to the voltage drop adjustment enabling circuit.

[0024] Furthermore, the step S40 is specifically as follows:

[0025] When the trigger signal CONA is at a high level, the MOS tube Q1 is turned on, and a high level is output to the optocoupler U4. Combined with the trigger signal CONB, the optocoupler U4 is enabled to work, and then the front-end voltage output value V_SET and the voltage division value V_SET_F are generated through the voltage division effect of the resistor R9 and the resistor R10, and the front-end voltage output value V_SET is input into the MCU, and the voltage division value V_SET_F is input into the power driver chip.

[0026] The advantages of the present invention are:

[0027] By setting the MOS tube pressure difference detection circuit to compare the front-end voltage value FB_VOUT and the back-end voltage value VF_MOS in real time, setting the window current comparison circuit to compare the output current value FB_IOUT and the current standard value ICON_SET in real time, enabling the voltage drop adjustment enabling circuit to work based on the comparison result, and adjusting the front-end voltage output value V_SET and the voltage division value V_SET_F; the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube pressure difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage division value V_SET_F, and then adjusts the MOS tube pressure difference of the front-end power supply, that is, adaptively adjusts the MOS tube pressure difference, reduces redundant load consumption, reduces the MOS tube power consumption and the heat generated, improves the overall heat dissipation effect, and improves the output efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0029] Figure 1 The invention discloses a circuit principle block diagram of a MOS tube pressure difference automatic regulating device.

[0030] Figure 2 It is a circuit diagram of a MOS tube voltage difference detection circuit of the present invention.

[0031] Figure 3 It is a circuit diagram of the voltage difference comparison circuit of the present invention.

[0032] Figure 4 It is a circuit diagram of the window current comparison circuit of the present invention.

[0033] Figure 5 It is a circuit diagram of the voltage drop regulation enabling circuit of the present invention.

[0034] Figure 6 It is a circuit diagram of the power drive chip of the present invention.

[0035] Figure 7 It is a circuit diagram of the MCU of the present invention.

[0036] Figure 8 The present invention is a schematic diagram of the use status of a MOS tube pressure difference automatic adjustment device of the present invention.

[0037] Fig. 9 The present invention is a flow chart of a method for automatically adjusting the pressure difference of a MOS tube. DETAILED DESCRIPTION

[0038] The technical solution in the embodiment of the present application has the following general idea: by setting the MOS tube pressure difference detection circuit to compare the front-end voltage value FB_VOUT and the back-end voltage value VF_MOS in real time, setting the window current comparison circuit to compare the output current value FB_IOUT and the current standard value ICON_SET in real time, enabling the voltage drop adjustment enabling circuit to work based on the comparison result, and adjusting the front-end voltage output value V_SET and the voltage divider value V_SET_F; the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube pressure difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage divider value V_SET_F, so as to realize adaptive adjustment of the MOS tube pressure difference, thereby reducing the power consumption of the MOS tube.

[0039] Please refer to Figures 1 to 9 As shown, a preferred embodiment of a MOS tube pressure difference automatic adjustment device of the present invention includes a MOS tube pressure difference detection circuit, a pressure difference comparison circuit, a window current comparison circuit, a voltage drop adjustment enabling circuit, a power driver chip and an MCU; the MOS tube pressure difference detection circuit is used to compare the front-end voltage value FB_VOUT and the rear-end voltage value VF_MOS, and output the voltage difference value FV_DEF; the pressure difference comparison circuit is used to compare the voltage difference value FV_DEF and the protection pressure difference control value VDEF_SET, and output the trigger signal CONB; the window current comparison circuit is used to compare the output current value FB_IOUT and the current standard value ICON_SET, and output the trigger signal CONA; the voltage drop adjustment enabling circuit is used to adjust the front-end voltage output value V_SET and the voltage division value V_SET_F based on the trigger signal CONA and the trigger signal CONB; the power driver chip is used to adjust the output voltage of the front-end power supply, and the model is preferably SG3525; the MCU is used to control the operation of the automatic adjustment device, and the model is preferably STM32F405RGT6;

[0040] The MCU is respectively connected to the MOS tube voltage difference detection circuit, the voltage drop regulation enabling circuit, the voltage difference comparison circuit and the window current comparison circuit; the input end of the voltage difference comparison circuit is connected to the output end of the MOS tube voltage difference detection circuit, and the output end is connected to the voltage drop regulation enabling circuit; the input end of the voltage drop regulation enabling circuit is connected to the output end of the window current comparison circuit, and the output end is connected to the power drive chip.

[0041] The MOS tube voltage difference detection circuit includes an operational amplifier U1B, a resistor R1, a resistor R2, a resistor R3, a resistor R7 and a resistor R8; the model of the operational amplifier U1B is preferably ADA4522-2;

[0042] Pin 5 of the operational amplifier U1B is connected to resistors R2 and R7, pin 6 is connected to resistors R1 and R3, pin 7 is connected to resistors R3, R8, a voltage difference comparison circuit and MCU; the resistor R7 is grounded; and the resistor R2 is connected to the MCU.

[0043] The voltage difference comparison circuit includes an operational amplifier U1A, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1; the model of the operational amplifier U1A is preferably ADA4522-2;

[0044] Pin 1 of the operational amplifier U1A is connected to the resistor R6 and the voltage drop adjustment enabling circuit, pin 2 is connected to the resistor R4, and pin 3 is connected to the resistor R5 and the capacitor C1; the resistor R6 and the capacitor C1 are both grounded; the resistor R5 is connected to the MOS tube voltage difference detection circuit; the resistor R4 is connected to the MCU.

[0045] The window current comparison circuit includes an operational amplifier U3, a diode D2, a light emitting diode LED2, a resistor R15, a resistor R16 and a resistor R20; the model of the operational amplifier U3 is preferably OPA188;

[0046] Pin 1 of the operational amplifier U3 is connected to the input end of the diode D2 and the light-emitting diode LED2, pin 3 is connected to the resistor R16 and the resistor R20, and pin 4 is connected to the resistor R15; the resistor R20 is connected to the output end of the diode D2; the output end of the light-emitting diode LED2 is connected to the voltage drop regulation enabling circuit; the resistor R15 is connected to the MCU.

[0047] The voltage drop regulation enabling circuit includes an optical coupler U4, a MOS tube Q1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R17, a capacitor C2, a capacitor C3 and a capacitor C4; the model of the optical coupler U4 is preferably AQY212S; the model of the MOS tube Q1 is preferably NCE2312;

[0048] Pin 1 of the optical coupler U4 is connected to resistors R11 and R12, pin 2 is connected to resistor R12 and grounded, pin 3 is connected to a voltage difference comparison circuit, and pin 4 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to resistors R13, R14 and capacitor C2, and the source is connected to capacitor C2 and resistor R14 and grounded; the resistor R13 is connected to a window current comparison circuit;

[0049] The resistor R11 is connected to the resistor R17, the resistor R9, the resistor R10 and the capacitor C3; one end of the capacitor C4 is connected to the capacitor C3 and the resistor R17 and grounded, and the other end is connected to the resistor R9 and the power driver chip; the resistor R10 is connected to the MCU.

[0050] It also includes a display screen; the display screen is connected to the MCU and is used to display the front-end voltage value FB_VOUT, the back-end voltage value VF_MOS, the voltage difference value FV_DEF, the output current value FB_IOUT, the protection voltage difference control value VDEF_SET, and the current standard value ICON_SET.

[0051] A preferred embodiment of a method for automatically adjusting a MOS tube pressure difference of the present invention comprises the following steps:

[0052] Step S10, the MOS tube voltage difference detection circuit collects the front-end voltage value FB_VOUT of the MOS tube in the front-end power supply, subtracts the back-end voltage value VF_MOS fed back by the MCU from the front-end voltage value FB_VOUT, obtains the voltage difference value FV_DEF and inputs it into the voltage difference comparison circuit and the MCU;

[0053] Step S20, the voltage difference comparison circuit subtracts the protection voltage difference control value VDEF_SET set by the MCU from the voltage difference value FV_DEF to obtain a trigger signal CONB, and inputs the trigger signal CONB into the voltage drop adjustment enabling circuit;

[0054] Step S30, the window current comparison circuit collects the output current value FB_IOUT of the front-end power supply, subtracts the current standard value ICON_SET set by the MCU from the output current value FB_IOUT to obtain a trigger signal CONA, and inputs the trigger signal CONA into the voltage drop adjustment enabling circuit;

[0055] Step S40, the voltage drop adjustment enabling circuit enables the optical coupler U4 to work based on the trigger signal CONA and the trigger signal CONB, adjusts the front-end voltage output value V_SET and inputs it into the MCU, and adjusts the voltage division value V_SET_F and inputs it into the power driver chip;

[0056] Step S50, the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube voltage difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage division value V_SET_F to complete the adjustment of the MOS tube voltage difference of the front-end power supply.

[0057] The step S20 is specifically as follows:

[0058] The voltage difference comparison circuit determines whether the voltage difference value FV_DEF is less than the protection voltage difference control value VDEF_SET set by the MCU. If so, a low-level trigger signal CONB is output to the voltage drop adjustment enabling circuit; if not, a high-level trigger signal CONB is output to the voltage drop adjustment enabling circuit.

[0059] The step S30 is specifically as follows:

[0060] The window current comparison circuit collects the output current value FB_IOUT of the front-end power supply, and determines whether the output current value FB_IOUT is less than the current standard value ICON_SET set by the MCU. If so, a low-level trigger signal CONA is output to the voltage drop adjustment enabling circuit; if not, a high-level trigger signal CONA is output to the voltage drop adjustment enabling circuit.

[0061] That is, the operational amplifier U3 forms a positive feedback circuit. Once triggered, pin 1 of the operational amplifier U3 outputs a high level until the voltage divider value of R16 / R20 is less than the current standard value ICON_SET, and then it outputs a low level. Therefore, the trigger signal CONA is a window trigger signal.

[0062] The step S40 is specifically as follows:

[0063] When the trigger signal CONA is at a high level, the MOS tube Q1 is turned on, and a high level is output to the optocoupler U4. The optocoupler U4 is enabled to work in combination with the high level of the trigger signal CONB, and then the front-end voltage output value V_SET and the voltage division value V_SET_F are generated through the voltage division effect of the resistor R9 and the resistor R10, and the front-end voltage output value V_SET is input to the MCU, and the voltage division value V_SET_F is input to the power driver chip. That is, the optocoupler U4 is enabled to work only when the trigger signal CONA and the trigger signal CONB are both at high levels.

[0064] In summary, the advantages of the present invention are:

[0065] By setting the MOS tube pressure difference detection circuit to compare the front-end voltage value FB_VOUT and the back-end voltage value VF_MOS in real time, setting the window current comparison circuit to compare the output current value FB_IOUT and the current standard value ICON_SET in real time, enabling the voltage drop adjustment enabling circuit to work based on the comparison result, and adjusting the front-end voltage output value V_SET and the voltage division value V_SET_F; the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube pressure difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage division value V_SET_F, and then adjusts the MOS tube pressure difference of the front-end power supply, that is, adaptively adjusts the MOS tube pressure difference, reduces redundant load consumption, reduces the MOS tube power consumption and the heat generated, improves the overall heat dissipation effect, and improves the output efficiency.

[0066] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A MOS tube pressure difference automatic adjustment device, Features: It includes a MOS tube pressure difference detection circuit, a pressure difference comparison circuit, a window current comparison circuit, a voltage drop regulation enabling circuit, a power drive chip and an MCU; The MCU is respectively connected to the MOS tube pressure difference detection circuit, the voltage drop regulation enabling circuit, the pressure difference comparison circuit and the window current comparison circuit; the input end of the pressure difference comparison circuit is connected to the output end of the MOS tube pressure difference detection circuit, and the output end is connected to the pressure drop regulation enabling circuit; the input end of the pressure drop regulation enabling circuit is connected to the output end of the window current comparison circuit, and the output end is connected to the power driver chip; The MOS tube voltage difference detection circuit includes an operational amplifier U1 B, a resistor R1, a resistor R2, a resistor R3, a resistor R7 and a resistor R8; Pin 5 of the operational amplifier U1 B is connected to resistors R2 and R7, pin 6 is connected to resistors R1 and R3, and pin 7 is connected to resistors R3, R8, a voltage difference comparison circuit, and MCU; the resistor R7 is grounded; and the resistor R2 is connected to the MCU; The voltage difference comparison circuit includes an operational amplifier U1A, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1; Pin 1 of the operational amplifier U1A is connected to the resistor R6 and the voltage drop adjustment enabling circuit, pin 2 is connected to the resistor R4, and pin 3 is connected to the resistor R5 and the capacitor C1; the resistor R6 and the capacitor C1 are both grounded; the resistor R5 is connected to the MOS tube voltage difference detection circuit; the resistor R4 is connected to the MCU.

2. A MOS tube pressure difference automatic adjustment device as claimed in claim 1, Features: The window current comparison circuit includes an operational amplifier U3, a diode D2, a light emitting diode LED2, a resistor R15, a resistor R16 and a resistor R20; Pin 1 of the operational amplifier U3 is connected to the input end of the diode D2 and the light-emitting diode LED2, pin 3 is connected to the resistor R16 and the resistor R20, and pin 4 is connected to the resistor R15; the resistor R20 is connected to the output end of the diode D2; the output end of the light-emitting diode LED2 is connected to the voltage drop regulation enabling circuit; the resistor R15 is connected to the MCU.

3. A MOS tube pressure difference automatic adjustment device as claimed in claim 1, Features: The voltage drop regulation enabling circuit includes an optical coupler U4, a MOS tube Q1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R17, a capacitor C2, a capacitor C3 and a capacitor C4; Pin 1 of the optical coupler U4 is connected to resistors R11 and R12, pin 2 is connected to resistor R12 and grounded, pin 3 is connected to a voltage difference comparison circuit, and pin 4 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to resistors R13, R14 and capacitor C2, and the source is connected to capacitor C2 and resistor R14 and grounded; the resistor R13 is connected to a window current comparison circuit; The resistor R11 is connected to the resistor R17, the resistor R9, the resistor R10 and the capacitor C3; one end of the capacitor C4 is connected to the capacitor C3 and the resistor R17 and grounded, and the other end is connected to the resistor R9 and the power driver chip; the resistor R10 is connected to the MCU.

4. A method for automatically adjusting the voltage difference of a MOS tube, Features: The method requires the use of the MOS tube pressure difference automatic adjustment device according to any one of claims 1 to 3, comprising the following steps: Step S10, the MOS tube voltage difference detection circuit collects the front-end voltage value FB_VOUT of the MOS tube in the front-end power supply, subtracts the back-end voltage value VF_MOS fed back by the MCU from the front-end voltage value FB_VOUT, obtains the voltage difference value FV_DEF and inputs it into the voltage difference comparison circuit and the MCU; Step S20, the voltage difference comparison circuit subtracts the protection voltage difference control value VDEF_SET set by the MCU from the voltage difference value FV_DEF to obtain a trigger signal CONB, and inputs the trigger signal CONB into the voltage drop adjustment enabling circuit; Step S30, the window current comparison circuit collects the output current value FB_IOUT of the front-end power supply, and determines whether the output current value FB_IOUT is less than the current standard value ICON_SET set by the MCU. If so, a low-level trigger signal CONA is output to the voltage drop adjustment enabling circuit; if not, a high-level trigger signal CONA is output to the voltage drop adjustment enabling circuit; Step S40, when the trigger signal CONA is at a high level, the MOS tube Q1 is turned on, and a high level is output to the optocoupler U4, and the optocoupler U4 is enabled to work in combination with the trigger signal CONB, and then a front-end voltage output value V_SET and a voltage division value V_SET_F are generated through the voltage division effect of the resistor R9 and the resistor R10, and the front-end voltage output value V_SET is input to the MCU, and the voltage division value V_SET_F is input to the power driver chip; Step S50, the MCU sets the back-end voltage value VF_MOS based on the front-end voltage output value V_SET and outputs it to the MOS tube voltage difference detection circuit, and the power driver chip sets the output voltage of the front-end power supply based on the voltage division value V_SET_F to complete the adjustment of the MOS tube voltage difference of the front-end power supply.

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