CN219107300U

CN219107300U - Voltage-multiplying power supply circuit

Info

Publication number: CN219107300U
Application number: CN202223407561.2U
Authority: CN
Inventors: 梁堃; 戴镒同; 罗木林
Original assignee: Shenzhen Zhenhua Microelectronics Co Ltd
Current assignee: Shenzhen Zhenhua Microelectronics Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-30
Anticipated expiration: 2032-12-16

Abstract

The utility model provides a voltage doubling power supply circuit, which belongs to the technical field of electronic circuits and comprises a buck-boost topology circuit, an input voltage power supply circuit, a full-bridge topology circuit, a buck-boost driving circuit and an auxiliary power supply circuit, wherein the buck-boost topology circuit and the full-bridge topology circuit are connected with the input voltage power supply circuit, the input end of the buck-boost driving circuit is connected with the full-bridge topology circuit, the output end of the buck-boost driving circuit is connected with the buck-boost topology circuit, and the auxiliary power supply circuit is connected with the full-bridge topology circuit for supplying power. The BUCK auxiliary source and the rear-stage full-bridge topology work characteristics of the utility model form a voltage doubling circuit to respectively supply power to the driving of the MOS tubes Q1 and Q3 of the upper bridge arm, the circuit structure is simpler, the devices are fewer, and the production cost is greatly saved.

Description

Voltage-multiplying power supply circuit

Technical Field

The utility model relates to the technical field of electronic circuits, in particular to a voltage-multiplying power supply circuit.

Background

In a two-stage topology circuit (four-switch BUCK-BOOST+full bridge), when the current stage BUCK-BOOST topology works in BUCK or BOOST mode, two MOS tubes Q1 or Q3 of an upper bridge arm in the topology always work in a direct state, and at the moment, driving power supply of the upper bridge arm direct MOS tube Q1 or Q3 is a problem. In order to solve the problem, the common method is to separately design an auxiliary transformer to supply power to the two MOS tubes Q1 and Q3 of the upper bridge arm, and the power supply mode is firstly complex in circuit design, secondly, the transformer is required to be separately designed, and secondly, the number of components is large, so that the product cost is increased, and the product reliability is reduced. Therefore, it is necessary to design a power supply circuit with a simple structure and low cost.

Disclosure of Invention

The utility model aims to provide a voltage-multiplying power supply circuit which solves the existing technical problems.

The utility model skillfully utilizes the BUCK auxiliary source and the working characteristics of the rear-stage full-bridge topology in the product to form a voltage doubling circuit to supply power to the driving of the MOS tubes Q1 and Q3 of the upper bridge arm respectively.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the voltage doubling power supply circuit comprises a step-up and step-down topology circuit, an input voltage power supply circuit, a full-bridge topology circuit, a step-up and step-down driving circuit and an auxiliary power supply circuit, wherein the step-up and step-down topology circuit and the full-bridge topology circuit are connected with the input voltage power supply circuit, the input end of the step-up and step-down driving circuit is connected with the full-bridge topology circuit, the output end of the step-up and step-down driving circuit is connected with the step-up and step-down topology circuit, and the auxiliary power supply circuit is connected with the full-bridge topology circuit for supplying power.

Further, the buck-boost topology circuit comprises a mos tube Q1, a resistor R1, an inductor L1, a mos tube Q2, a resistor R2, a mos tube Q3, a resistor R3, a mos tube Q4 and a resistor R4, wherein the G pole of the mos tube Q1 is respectively connected with one end of the resistor R1 and the buck-boost driving circuit, the D pole of the mos tube Q1 is connected with the input positive pole of a voltage source, the S pole of the mos tube Q1 is respectively connected with the other end of the resistor R1, one end of the inductor L1, the D pole of the mos tube Q2 and the buck-boost driving circuit, the G pole of the mos tube Q2 is connected with one end of the resistor R2 and the buck-boost driving circuit, and the S pole of the mos tube Q2 is respectively connected with the other end of the resistor R2, one end of the resistor R4 and the S pole of the mos tube Q4 and is grounded;

the pole G of the mos tube Q3 is respectively connected with one end of a resistor R3 and a buck-boost driving circuit, the pole D of the mos tube Q3 is connected with a full-bridge topology circuit, the pole S of the mos tube Q3 is respectively connected with the other end of the resistor R3, the other end of an inductor L1, the pole D of the mos tube Q4 and the buck-boost driving circuit, and the pole G of the mos tube Q4 is connected with the other end of the R4 and the buck-boost driving circuit.

Further, the input voltage power supply circuit comprises a capacitor C2, one end of the capacitor C2 is connected with a power supply end, the D pole of the mos transistor Q3 and the full-bridge topology circuit, and the other end of the capacitor C2 is grounded.

Further, the full-bridge topology circuit comprises a mos transistor Q5, a resistor R5, an inductor T1-A, mos, a resistor R6, a mos transistor Q7, a resistor R7, a mos transistor Q8, a resistor R8, a diode D6 and a capacitor C10, wherein the D pole of the mos transistor Q5 is connected with an input voltage supply circuit, the G pole of the mos transistor Q5 is respectively connected with one end of the resistor R5 and an external control terminal DR5, the S pole of the mos transistor Q5 is respectively connected with the other end of the resistor R5, the D pole of the mos transistor Q6, one end of the capacitor C10 and one end of the inductor T1-A, the G pole of the mos transistor Q6 is respectively connected with one end of the resistor R6 and the external control terminal DR6, the S pole of the mos transistor Q6 is respectively connected with one end of the resistor R8 and the S pole of the mos transistor Q8, the G pole of the mos transistor Q7 is respectively connected with one end of the resistor R7 and the external control terminal DR5, and the other end of the inductor T7 is respectively connected with the other end of the resistor R8 and the other end of the resistor Q8.

Further, the auxiliary power supply circuit comprises a capacitor C6, a mos tube Q9, a mos tube Q10, a capacitor C9, a diode D5, an inductor L2 and a capacitor C3, one end of the capacitor C6 is respectively connected with the positive electrode of the auxiliary power supply input end and the D electrode of the mos tube Q9, the G electrode of the mos tube Q9 is connected with an external control end DRA, the S electrode of the mos tube Q9 is respectively connected with the D electrode of the mos tube Q10, one end of the capacitor C9 and one end of the inductor L2, the other end of the capacitor C9 is respectively connected with the output end of the diode D5 and the buck-boost driving circuit, the input end of the diode D5 is respectively connected with the other end of the inductor L2, one end of the capacitor C3 and the output auxiliary power supply end, the G electrode of the mos tube Q10 is connected with the external control end DRB, and the S electrode of the mos tube Q10 is connected with the other end of the capacitor C9 and grounded.

Further, the buck-boost driving circuit comprises a first starting circuit, a second starting circuit, a third starting circuit and a fourth starting circuit, wherein the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit are connected with the buck-boost topological circuit and the full-bridge topological circuit, and the auxiliary power supply circuit is respectively connected with the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit for charging.

Further, the first starting circuit comprises a diode D1, a capacitor C4 and a driving circuit U1-A, wherein the control input end of the driving circuit U1-A is connected with an external controller, the positive power end of the driving circuit U1-A is respectively connected with the output end of the diode D1 and one end of the capacitor C4, the output end of the driving circuit U1-A is connected with the G electrode of the mos tube Q1, the power negative electrode of the driving circuit U1-A is connected with the other end of the capacitor C4, and the input end of the diode D1 is connected with the output end of the diode D5.

Further, the second starting circuit comprises a diode D3, a capacitor C7 and a driving circuit U3-A, wherein the control input end of the driving circuit U3-A is connected with an external controller, the positive power end of the driving circuit U3-A is respectively connected with the output end of the diode D3 and one end of the capacitor C7, the output end of the driving circuit U3-A is connected with the G electrode of the mos tube Q3, the power negative electrode of the driving circuit U3-A is connected with the other end of the capacitor C7, and the input end of the diode D3 is connected with the output end of the diode D6.

Further, the third starting circuit comprises a diode D2, a capacitor C5 and a driving circuit U2-A, wherein the control input end of the driving circuit U2-A is connected with an external controller, the positive power end of the driving circuit U2-A is respectively connected with the output end of the diode D2 and one end of the capacitor C5, the output end of the driving circuit U2-A is connected with the G electrode of the mos tube Q2, the power negative electrode of the driving circuit U2-A is connected with the other end of the capacitor C5, and the input end of the diode D2 is connected with the input end of the diode D6.

Further, the fourth starting circuit comprises a diode D4, a capacitor C8 and a driving circuit U4-A, wherein the control input end of the driving circuit U4-A is connected with an external controller, the positive power end of the driving circuit U4-A is respectively connected with the output end of the diode D4 and one end of the capacitor C8, the output end of the driving circuit U4-A is connected with the G electrode of the mos tube Q4, the power negative electrode of the driving circuit U4-A is connected with the other end of the capacitor C8, and the input end of the diode D4 is connected with the input end of the diode D6.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

the BUCK auxiliary source and the working characteristics of the rear-stage full-bridge topology form a voltage doubling circuit to supply power to the driving of the MOS tubes Q1 and Q3 of the upper bridge arm respectively, the circuit structure is simpler, devices are fewer, the production cost is greatly saved, the full-bridge topology realizes the input and output electrical isolation, the purpose of voltage conversion is achieved, the BUCK-BOOST topology converts the voltage with wide input variation into stable bus voltage VBUS, and stable input voltage is provided for the rear-stage full-bridge topology, so that the full-bridge topology works at an optimal working point, and the efficiency of the whole machine is improved.

Drawings

Fig. 1 is a schematic circuit diagram of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the utility model, and that these aspects of the utility model may be practiced without these specific details.

As shown in FIG. 1, the voltage doubling power supply circuit comprises a buck-boost topology circuit, an input voltage power supply circuit, a full-bridge topology circuit, a buck-boost driving circuit and an auxiliary power supply circuit, wherein the buck-boost topology circuit and the full-bridge topology circuit are connected with the input voltage power supply circuit, the input end of the buck-boost driving circuit is connected with the full-bridge topology circuit, the output end of the buck-boost driving circuit is connected with the buck-boost topology circuit, and the auxiliary power supply circuit is connected with the full-bridge topology circuit for supplying power. The input voltage power supply circuit comprises a capacitor C2, one end of the capacitor C2 is connected with a power supply end, the D pole of the mos tube Q3 and the full-bridge topology circuit, and the other end of the capacitor C2 is grounded. The capacitor C2 mainly plays a role of filtering and outputs a stable power supply.

In the embodiment of the utility model, as shown in fig. 1, the buck-boost topology circuit comprises a mos tube Q1, a resistor R1, an inductor L1, a mos tube Q2, a resistor R2, a mos tube Q3, a resistor R3, a mos tube Q4 and a resistor R4, wherein the G pole of the mos tube Q1 is respectively connected with one end of the resistor R1 and the buck-boost driving circuit, the D pole of the mos tube Q1 is connected with the input positive pole of a voltage source, the S pole of the mos tube Q1 is respectively connected with the other end of the resistor R1, one end of the inductor L1, one end of the mos tube Q2 and the buck-boost driving circuit, the G pole of the mos tube Q2 is connected with one end of the R2 and the buck-boost driving circuit, and the S pole of the mos tube Q2 is respectively connected with the other end of the resistor R2, one end of the resistor R4 and the S pole of the mos tube Q4 and is grounded.

In the embodiment of the utility model, as shown in fig. 1, the full-bridge topology circuit comprises a mos transistor Q5, a resistor R5, an inductor T1-A, mos, a resistor R6, a mos transistor Q7, a resistor R7, a mos transistor Q8, a resistor R8, a diode D6 and a capacitor C10, wherein the D pole of the mos transistor Q5 is connected with an input voltage supply circuit, the G pole of the mos transistor Q5 is connected with one end of the resistor R5 and an external control terminal DR5, the S pole of the mos transistor Q5 is connected with the other end of the resistor R5, the D pole of the mos transistor Q6, one end of the capacitor C10 and one end of the inductor T1-a, the G pole of the mos transistor Q6 is connected with one end of the resistor R6 and the S pole of the external control terminal DR6, the D pole of the mos transistor Q7 is connected with the input voltage supply circuit, the G pole of the mos transistor Q7 is connected with one end of the resistor R7 and the external control terminal DR7, and the other end of the mos transistor Q8 is connected with the other end of the resistor R8, and the other end of the mos transistor Q7 is connected with the other end of the inductor T8.

In the embodiment of the utility model, as shown in fig. 1, the auxiliary power supply circuit comprises a capacitor C6, a mos tube Q9, a mos tube Q10, a capacitor C9, a diode D5, an inductor L2 and a capacitor C3, wherein one end of the capacitor C6 is respectively connected with the positive electrode of the auxiliary power supply input end and the D electrode of the mos tube Q9, the G electrode of the mos tube Q9 is connected with an external control end DRA, the S electrode of the mos tube Q9 is respectively connected with the D electrode of the mos tube Q10, one end of the capacitor C9 and one end of the inductor L2, the other end of the capacitor C9 is respectively connected with the output end of the diode D5 and the buck-boost driving circuit, the input end of the diode D5 is respectively connected with the other end of the inductor L2, one end of the capacitor C3 and the output auxiliary power supply end, the G electrode of the mos tube Q10 is connected with the S electrode of the external control end DRB and the other end of the capacitor C9, and grounded.

In the embodiment of the utility model, as shown in fig. 1, the buck-boost driving circuit comprises a first starting circuit, a second starting circuit, a third starting circuit and a fourth starting circuit, wherein the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit are connected with the buck-boost topology circuit and the full-bridge topology circuit, and the auxiliary power supply circuit is respectively connected with the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit for charging. The first starting circuit comprises a diode D1, a capacitor C4 and a driving circuit U1-A, wherein the control input end of the driving circuit U1-A is connected with an external controller, the positive power end of the driving circuit U1-A is respectively connected with the output end of the diode D1 and one end of the capacitor C4, the output end of the driving circuit U1-A is connected with the G electrode of a mos tube Q1, the power negative electrode of the driving circuit U1-A is connected with the other end of the capacitor C4, and the input end of the diode D1 is connected with the output end of a diode D5. The second starting circuit comprises a diode D3, a capacitor C7 and a driving circuit U3-A, wherein the control input end of the driving circuit U3-A is connected with an external controller, the positive power end of the driving circuit U3-A is respectively connected with the output end of the diode D3 and one end of the capacitor C7, the output end of the driving circuit U3-A is connected with the G electrode of the mos tube Q3, the power negative electrode of the driving circuit U3-A is connected with the other end of the capacitor C7, and the input end of the diode D3 is connected with the output end of the diode D6. The third starting circuit comprises a diode D2, a capacitor C5 and a driving circuit U2-A, wherein the control input end of the driving circuit U2-A is connected with an external controller, the positive power end of the driving circuit U2-A is respectively connected with the output end of the diode D2 and one end of the capacitor C5, the output end of the driving circuit U2-A is connected with the G electrode of the mos tube Q2, the power negative electrode of the driving circuit U2-A is connected with the other end of the capacitor C5, and the input end of the diode D2 is connected with the input end of the diode D6. The fourth starting circuit comprises a diode D4, a capacitor C8 and a driving circuit U4-A, wherein the control input end of the driving circuit U4-A is connected with an external controller, the positive power end of the driving circuit U4-A is respectively connected with the output end of the diode D4 and one end of the capacitor C8, the output end of the driving circuit U4-A is connected with the G electrode of the mos tube Q4, the power negative electrode of the driving circuit U4-A is connected with the other end of the capacitor C8, and the input end of the diode D4 is connected with the input end of the diode D6.

The specific power supply process of boosting and reducing voltage is as follows:

when the four-switch BUCK-BOOST works in the BUCK BUCK mode, the upper bridge arm MOS transistor Q3 works in a through state, the lower bridge arm MOS transistor Q4 is not conducted, and at the moment, the midpoint B voltage of one side bridge arm of the rear-stage full-bridge topology is a pulsating voltage taking VBUS as an amplitude, so that the auxiliary power supply voltage VCC forms a voltage doubling rectifying circuit by utilizing the pulsating voltage. The detailed process of voltage doubling is as follows:

the bridge arm at one side of the rear-stage full-bridge topology consists of MOS transistors Q5 and Q6, and the MOS transistors Q5 and Q6 are alternately conducted, so that the voltage at the midpoint B of the bridge arm is a pulsating voltage taking VBUS as the amplitude. When the lower bridge arm MOS tube Q6 is conducted, the voltage of the midpoint B of the bridge arm is clamped to 0V, the auxiliary power supply voltage VCC charges the capacitor C10 through the rectifier diode D6, then the auxiliary power supply voltage returns to the ground GND through the lower bridge arm MOS tube Q6, and the voltages at two ends of the capacitor C10 are approximately equal to VCC voltage after being charged for a plurality of periods; when the lower bridge arm MOS tube Q6 is turned off and the upper bridge arm MOS tube Q5 is turned on, the voltage of the bridge arm midpoint B is the bus voltage VBUS, the voltage VCC2=VBUS+VCC of the capacitor C10 to the ground GND charges the capacitor C7 through the rectifier diode D3, the voltage at two ends of the capacitor C7 is approximately equal to the stable VCC voltage after a plurality of periods of charging (namely, the voltage at the upper end of the capacitor C7 is always maintained at the stable VCC voltage relative to the voltage at the lower end H2), and the stable voltage continuously supplies power for the upper bridge arm MOS tube Q3 to drive the U3A, so that the purpose of voltage doubling is achieved.

When the four-switch BUCK-BOOST works in the BOOST boosting mode, the upper bridge arm MOS tube Q1 works in a straight-through state, the lower bridge arm MOS tube Q2 is not conducted, and as the auxiliary source is a BUCK circuit, the midpoint A voltage of the BUCK circuit is a pulsating voltage taking VIN as an amplitude, the auxiliary power supply voltage VCC forms a voltage doubling rectifying circuit by utilizing the pulsating voltage, and the output voltage after voltage doubling rectification is VCC1 to drive and supply power to the upper bridge arm MOS tube Q1.

The voltage-doubling output voltage is VCC1 (VCC 1=vin+vcc), and VCC1 forms a stable voltage (the amplitude is approximately equal to vin+vcc) through the rectifying diode D1 and the capacitor C4 to drive and supply power to the upper bridge arm MOS transistor Q1.

Because the rear stage is full-bridge topology, the voltage at the middle point B of a bridge arm on one side of the full-bridge topology is square wave voltage with the maximum value of VBUS and the minimum value of 0V, the auxiliary voltage VCC forms a voltage doubling rectifying circuit through a diode D6, a capacitor C10 and a reference ground (the middle point B of the bridge arm), the voltage doubling output voltage is VCC2 (VCC2=VBUS+VCC), and the VCC2 forms stable voltage (the amplitude is approximately equal to VBUS+VCC) through a rectifying diode D3 and a capacitor C7 to supply power for the MOS tube Q3 of the upper bridge arm in a driving mode.

Because the auxiliary source adopts the BUCK circuit, the voltage at the midpoint A of the BUCK circuit is square wave voltage with the maximum value of VIN and the minimum value of 0V, the output voltage of the auxiliary source is VCC, and the VCC forms a voltage doubling rectifying circuit through a diode D5, a capacitor C9 and a reference ground (the midpoint A of the BUCK circuit), and the voltage doubling detailed process is as follows:

because the upper MOS tube Q9 and the lower MOS tube Q10 of the BUCK circuit are alternately conducted, when the lower MOS tube Q10 is conducted, the auxiliary source voltage VCC charges the capacitor C9 through the rectifier diode D5, then the capacitor C9 returns to the ground GND through the lower MOS tube Q10, and after being charged for a plurality of periods, the voltage at two ends of the capacitor C9 is approximately equal to the VCC voltage; when the lower MOS transistor Q10 is turned off, the upper MOS transistor Q9 is turned on, at this time, the voltage at the midpoint A of the BUCK circuit is VIN, the voltage VC1=VIN+VCC of the capacitor C9 to the ground GND, meanwhile, the capacitor C4 is charged through the rectifier diode D1, after a few periods of charging, the voltage at two ends of the capacitor C4 is approximately equal to the VCC voltage (namely, the voltage at the upper end of the capacitor C4 is always kept at the stable VCC voltage relative to the voltage at the lower end H1), and the stable voltage continuously supplies power for the driving U1A of the MOS transistor Q1 of the upper bridge arm, so that the purpose of being pressed is achieved.

The BUCK-BOOST topology converts voltage with wide input variation into stable busbar voltage VBUS, provides stable input voltage for the rear-stage full-bridge topology, enables the full-bridge topology to work at an optimal working point, and improves the overall efficiency.

The full-bridge topology realizes the input and output electrical isolation and simultaneously achieves the purpose of voltage conversion. An auxiliary source (BUCK topology) provides an auxiliary supply VCC voltage for the entire circuit.

The BUCK-BOOST driving circuit provides driving for four MOS tubes in the BUCK-BOOST topology, the driving circuit U1A provides driving signals for the MOS tube Q1, the driving circuit U2A provides driving signals for the MOS tube Q2, the driving circuit U3A provides driving signals for the MOS tube Q3, and the driving circuit U4A provides driving signals for the MOS tube Q4.

The BUCK auxiliary source and the post-stage full-bridge topology working characteristics in the product are utilized to form a voltage doubling circuit to supply power to the driving of the MOS tubes Q1 and Q3 of the upper bridge arm respectively.

The rectifying diodes D1, D2, D3, D4, D5 and D6 are ultrafast recovery diodes, and the MOS transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 and Q10 are N-channel MOS transistors.

The UI-A driving circuit, the U2-A driving circuit, the U3-A driving circuit and the U4-A driving circuit are all driving chips ZHM2101, D1-D4 are input ends of the driving chips, and DR1-DR4 are output ends of the chips.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. The voltage-doubling power supply circuit is characterized in that: the full-bridge power supply circuit comprises a buck-boost topology circuit, an input voltage power supply circuit, a full-bridge topology circuit, a buck-boost driving circuit and an auxiliary power supply circuit, wherein the buck-boost topology circuit and the full-bridge topology circuit are connected with the input voltage power supply circuit, the input end of the buck-boost driving circuit is connected with the full-bridge topology circuit, the output end of the buck-boost driving circuit is connected with the buck-boost topology circuit, and the auxiliary power supply circuit is connected with the full-bridge topology circuit for supplying power.

2. The voltage-doubler supply circuit of claim 1, wherein: the buck-boost topology circuit comprises a mos tube Q1, a resistor R1, an inductor L1, a mos tube Q2, a resistor R2, a mos tube Q3, a resistor R3, a mos tube Q4 and a resistor R4, wherein the G pole of the mos tube Q1 is respectively connected with one end of the resistor R1 and the buck-boost driving circuit, the D pole of the mos tube Q1 is connected with the input positive pole of a voltage source, the S pole of the mos tube Q1 is respectively connected with the other end of the resistor R1, one end of the inductor L1, the D pole of the mos tube Q2 and the buck-boost driving circuit, the G pole of the mos tube Q2 is connected with one end of the R2 and the buck-boost driving circuit, and the S pole of the mos tube Q2 is respectively connected with the other end of the resistor R2, one end of the resistor R4 and the S pole of the mos tube Q4 and is grounded;

3. A voltage doubler supply circuit according to claim 2, wherein: the input voltage power supply circuit comprises a capacitor C2, one end of the capacitor C2 is connected with a power supply end, the D pole of the mos tube Q3 and the full-bridge topology circuit, and the other end of the capacitor C2 is grounded.

4. A voltage doubler supply circuit according to claim 3, wherein: the full-bridge topology circuit comprises a mos tube Q5, a resistor R5, an inductor T1-A, mos, a resistor R6, a mos tube Q7, a resistor R7, a mos tube Q8, a resistor R8, a diode D6 and a capacitor C10, wherein the D pole of the mos tube Q5 is connected with an input voltage supply circuit, the G pole of the mos tube Q5 is respectively connected with one end of the resistor R5 and an external control terminal DR5, the S pole of the mos tube Q5 is respectively connected with the other end of the resistor R5, the D pole of the mos tube Q6, one end of the capacitor C10 and one end of the inductor T1-A, the G pole of the mos tube Q6 is respectively connected with one end of the resistor R6 and the external control terminal DR6, the S pole of the mos tube Q6 is respectively connected with one end of the resistor R8 and the S pole of the mos tube Q8, the G pole of the mos tube Q7 is respectively connected with one end of the resistor R7 and the external control terminal DR5, the S pole of the other end of the mos tube Q7 is respectively connected with the other end of the inductor T8 and the other end of the resistor R8 and the other end of the inductor T1-A.

5. The voltage-doubler supply circuit of claim 4, wherein: the auxiliary power supply circuit comprises a capacitor C6, a mos tube Q9, a mos tube Q10, a capacitor C9, a diode D5, an inductor L2 and a capacitor C3, wherein one end of the capacitor C6 is respectively connected with the positive electrode of the input end of the auxiliary power supply and the D electrode of the mos tube Q9, the G electrode of the mos tube Q9 is connected with an external control end DRA, the S electrode of the mos tube Q9 is respectively connected with the D electrode of the mos tube Q10, one end of the capacitor C9 and one end of the inductor L2, the other end of the capacitor C9 is respectively connected with the output end of the diode D5 and a buck-boost driving circuit, the input end of the diode D5 is respectively connected with the other end of the inductor L2, one end of the capacitor C3 and the output auxiliary power supply end, the G electrode of the mos tube Q10 is connected with the external control end DRB, and the S electrode of the mos tube Q10 is connected with the other end of the capacitor C9 and grounded.

6. The voltage-doubler supply circuit of claim 5, wherein: the buck-boost driving circuit comprises a first starting circuit, a second starting circuit, a third starting circuit and a fourth starting circuit, wherein the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit are connected with the buck-boost topological circuit and the full-bridge topological circuit, and the auxiliary power supply circuit is respectively connected with the first starting circuit, the second starting circuit, the third starting circuit and the fourth starting circuit for charging.

7. The voltage-doubler supply circuit of claim 6, wherein: the first starting circuit comprises a diode D1, a capacitor C4 and a driving circuit U1-A, wherein the control input end of the driving circuit U1-A is connected with an external controller, the positive power end of the driving circuit U1-A is respectively connected with the output end of the diode D1 and one end of the capacitor C4, the output end of the driving circuit U1-A is connected with the G electrode of a mos tube Q1, the power negative electrode of the driving circuit U1-A is connected with the other end of the capacitor C4, and the input end of the diode D1 is connected with the output end of a diode D5.

8. The voltage-doubler supply circuit of claim 6, wherein: the second starting circuit comprises a diode D3, a capacitor C7 and a driving circuit U3-A, wherein the control input end of the driving circuit U3-A is connected with an external controller, the positive power end of the driving circuit U3-A is respectively connected with the output end of the diode D3 and one end of the capacitor C7, the output end of the driving circuit U3-A is connected with the G electrode of the mos tube Q3, the power negative electrode of the driving circuit U3-A is connected with the other end of the capacitor C7, and the input end of the diode D3 is connected with the output end of the diode D6.

9. The voltage-doubler supply circuit of claim 6, wherein: the third starting circuit comprises a diode D2, a capacitor C5 and a driving circuit U2-A, wherein the control input end of the driving circuit U2-A is connected with an external controller, the positive power end of the driving circuit U2-A is respectively connected with the output end of the diode D2 and one end of the capacitor C5, the output end of the driving circuit U2-A is connected with the G electrode of the mos tube Q2, the power negative electrode of the driving circuit U2-A is connected with the other end of the capacitor C5, and the input end of the diode D2 is connected with the input end of the diode D6.

10. The voltage-doubler supply circuit of claim 6, wherein: the fourth starting circuit comprises a diode D4, a capacitor C8 and a driving circuit U4-A, wherein the control input end of the driving circuit U4-A is connected with an external controller, the positive power end of the driving circuit U4-A is respectively connected with the output end of the diode D4 and one end of the capacitor C8, the output end of the driving circuit U4-A is connected with the G electrode of the mos tube Q4, the power negative electrode of the driving circuit U4-A is connected with the other end of the capacitor C8, and the input end of the diode D4 is connected with the input end of the diode D6.