WO2019047001A1

WO2019047001A1 - Multi-functional integrated controller circuit

Info

Publication number: WO2019047001A1
Application number: PCT/CN2017/100480
Authority: WO
Inventors: 李英; 赵德琦; 吴壬华
Original assignee: 上海欣锐电控技术有限公司
Priority date: 2017-09-05
Filing date: 2017-09-05
Publication date: 2019-03-14
Also published as: CN110199451A

Abstract

A multi-functional integrated controller circuit, wherein: a power grid (101) is connected to a first terminal of a power factor correction PFC circuit (102), while a second terminal of the power factor correction PFC circuit (102) is connected to a first terminal of a primary circuit (103) of a direct current conversion circuit; a second terminal of the primary circuit (103) of the direct current conversion circuit is connected to a primary winding of a transformer (104), and a first secondary winding of the transformer (104) is connected to a first terminal of a first secondary circuit (105) of the direct current conversion circuit, while a second terminal of the first secondary circuit (105) of the direct current conversion circuit is connected to a power battery (106); a second secondary winding of the transformer (104) is connected to a first terminal of a second secondary circuit (107) of the direct current conversion circuit, and a second terminal of the second secondary circuit (107) of the direct current conversion circuit is connected to a first terminal of a step-down circuit (108), while a second terminal of the step-down circuit (108) is connected to a first terminal of a low voltage battery, a second terminal of the low voltage battery (109) being connected to a vehicle-mounted electronic device (110) and a battery management system (BMS) (111) respectively. The multi-functional integrated controller circuit integrates a charging circuit and a driving circuit of a new energy vehicle, said two circuits sharing components so as to reduce components and reduce costs.

Description

Multifunctional integrated controller circuit

Technical field

The present invention relates to the field of electronic technologies, and in particular, to a multifunctional integrated controller circuit.

Background technique

New energy vehicles have developed rapidly and have become one of the fastest growing industries in China in recent years. As users pay attention to the cost of new energy vehicles and the requirements for vehicle comfort, the lightweight, miniaturization and integration of key parts of the vehicle has become an important research direction of the OEM.

New energy vehicles have two states, charging state and driving state. The charging state and driving state of new energy vehicles are completed by three circuits, so the number of components is large, the volume is large, and the cost is high.

Summary of the invention

The problem to be solved by the present invention is to provide a multi-functional integrated controller circuit that can be used for the charging state and the driving state of a new energy vehicle, thereby reducing components, achieving integration on the circuit, saving volume and reducing cost.

In order to solve the above problems, an embodiment of the present invention provides a multi-function integrated controller circuit, which may include a power grid, a power factor correction PFC circuit, a DC conversion circuit primary side circuit, a DC conversion circuit first secondary side circuit, and a DC conversion circuit. Two secondary circuits, transformers, step-down circuits, power batteries, low-voltage batteries, automotive electrical equipment and BMS, among which:

The power grid is connected to the first end of the power factor correction PFC circuit, and the second end of the power factor correction PFC circuit is connected to the first end of the primary circuit of the DC conversion circuit, and the primary side of the DC conversion circuit a second end of the circuit is coupled to the primary winding of the transformer, a first secondary winding of the transformer is coupled to a first end of the first secondary circuit of the DC conversion circuit, the first secondary circuit of the DC conversion circuit a second end is connected to the power battery, a second auxiliary winding of the transformer is connected to a first end of the second secondary circuit of the DC conversion circuit, and a second end of the second secondary circuit of the DC conversion circuit is The first end of the step-down circuit is connected, the second end of the step-down circuit is connected to the first end of the low-voltage battery, and the second end of the step-down battery is respectively connected to the vehicle-mounted electric device and the Said BMS connection.

Wherein, the power factor correction PFC circuit can also be a bridgeless power factor correction PFC circuit Equal power factor correction PFC circuit.

Optionally, the power factor correction PFC circuit may include a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, and a second capacitor a first inductor, a first MOS transistor, wherein:

a positive electrode of the first diode is connected to a negative electrode of the second diode, and a positive electrode of the second diode is respectively connected to a positive electrode of the fourth diode and a first electrode of the first capacitor a terminal, a source of the first MOS transistor, a cathode of the second capacitor, a cathode of the fourth diode is connected to a cathode of the third diode, and a third diode The anode is connected to the cathode of the first diode, the second end of the first capacitor, and the first end of the first inductor, respectively, and the second end of the first inductor is respectively connected to the first MOS transistor The drain and the anode of the fifth diode are connected, and the cathode of the fifth diode is connected to the anode of the second capacitor.

Wherein, the primary circuit of the DC conversion circuit can also be a primary circuit of any of the following:

Half-bridge resonant circuit, full-bridge phase shifting circuit, full-bridge resonant circuit and active clamp circuit.

Optionally, the primary circuit of the DC conversion circuit includes a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a third capacitor, and a first switch, where:

a first end of the third capacitor is coupled to a first tap of a primary winding of the transformer, and a second tap of a primary winding of the transformer is coupled to a first end of the first switch, the first switch The second end is respectively connected to the source of the fourth MOS transistor and the drain of the fifth MOS transistor, and the source of the fifth MOS transistor is connected to the source of the third MOS transistor and grounded. The drains of the third MOS transistors are respectively connected to the source of the second MOS transistor and the second end of the third capacitor.

Optionally, the first secondary circuit of the DC conversion circuit includes a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth MOS transistor, a fourth capacitor, and a fifth capacitor, wherein:

a first tap of the first sub winding of the transformer is connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is respectively connected to a drain of the seventh MOS transistor and a sixth MOS transistor a source connection, a drain of the sixth MOS transistor is respectively connected to a drain of the eighth MOS transistor and a first end of the fifth capacitor, and a second end of the fifth capacitor is respectively connected to the seventh a source of the MOS transistor, a source of the ninth MOS transistor, a second tap of the first sub winding of the transformer, and a drain of the ninth MOS transistor and a source of the eighth MOS transistor The third tap connection of the first secondary winding of the transformer.

The second secondary circuit of the DC conversion circuit may also be a secondary circuit of any of the following:

Optionally, the second secondary circuit of the DC conversion circuit includes a sixth diode, a seventh diode, and a sixth capacitor, wherein:

a first tap of the second secondary winding of the transformer is connected to a positive pole of the sixth diode, and a negative pole of the sixth diode is respectively opposite to a negative pole and a sixth capacitor of the seventh diode a first end connection, a second end of the sixth capacitor is coupled to a second tap of the second secondary winding of the transformer, a positive pole of the seventh diode and a second secondary winding of the transformer Three taps are connected.

The step-down circuit includes a tenth MOS transistor, an eighth diode, a second inductor, and a seventh capacitor, wherein:

The source of the tenth MOS transistor is respectively connected to the anode of the eighth diode and the first end of the second inductor, and the second end of the second inductor and the first end of the seventh capacitor The terminal is connected, and the second end of the seventh capacitor is connected to the anode of the eighth diode.

Wherein the circuit comprises:

a live line of the power grid is respectively connected to a positive pole of the first diode of the power factor correction PFC circuit and a negative pole of the second diode, and a neutral line of the power grid and a third of the power factor correction PFC circuit respectively a positive pole of the diode and a negative pole of the fourth diode;

a positive pole of a second capacitor of the power factor correction PFC circuit is connected to a drain of a fourth MOS transistor of the primary circuit of the DC conversion circuit, and a cathode of the second capacitor is respectively connected to a primary circuit of the DC conversion circuit a source of the third MOS transistor and a source of the fifth MOS transistor are connected and grounded; a first end of the fifth capacitor of the first secondary circuit of the DC conversion circuit is connected to the power battery, and the fifth capacitor is The second end is connected to the power battery and grounded;

a first end of a sixth capacitor of the second secondary circuit of the DC conversion circuit is connected to a drain of a tenth MOS transistor of the buck circuit, and a second end of the sixth capacitor is respectively connected to the buck circuit Connecting the positive terminal of the eighth diode and the second end of the seventh capacitor;

The seventh capacitor of the step-down circuit is connected in parallel with the low voltage battery.

In the present invention, the power grid, the power factor correction PFC circuit, the primary conversion circuit of the DC conversion circuit, the first secondary side circuit of the DC conversion circuit, the second secondary side circuit of the DC conversion circuit, the transformer, the step-down circuit, the power battery, the low voltage battery, and BMS constitutes charging circuit, power battery, DC secondary circuit first secondary circuit, DC conversion circuit second secondary circuit, transformer, step-down circuit, low voltage battery, vehicle The electric equipment and the BMS form a driving circuit. When the charging circuit works, the driving circuit does not work, and the charging circuit does not work when the driving circuit works, so the two circuits share the power battery, the first secondary side circuit of the DC conversion circuit, and the second secondary side of the DC conversion circuit. Circuits, transformers, step-down circuits, low-voltage batteries and BMS can reduce components and save space and cost. At the same time, the reduction of components will improve the reliability of the system.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic structural diagram of a multi-function integrated controller circuit according to the present invention;

2 is a circuit schematic diagram of a multi-function integrated controller circuit proposed by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The details are described below separately.

The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present invention are used to distinguish different objects, and are not intended to describe a specific order. . Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or, optionally, Other steps or units inherent to these processes, methods, products or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The phrase appears in various places in the manual and They are not necessarily all referring to the same embodiment, nor are they separate or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

"Multiple" means two or more. "and/or", describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The character "/" generally indicates that the contextual object is an "or" relationship.

Embodiments of the present application will be described below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic structural diagram of a multi-function integrated controller circuit according to the present invention. The multi-function integrated controller circuit shown in FIG. 1 may include a power grid 101 and a power factor correction PFC. Circuit 102, DC conversion circuit primary circuit 103, DC conversion circuit first secondary circuit 105, DC conversion circuit second secondary circuit 107, transformer 104, step-down circuit 108, power battery 106, low voltage battery 109, vehicle power Device 110 and BMS 111, where:

The power grid 101 is connected to the first end of the power factor correction PFC circuit 102, and the second end of the power factor correction PFC circuit 102 is connected to the first end of the DC conversion circuit primary circuit 103. a second end of the conversion circuit primary circuit 103 is connected to the primary winding of the transformer 104, and a first secondary winding of the transformer 104 is connected to a first end of the first secondary circuit 105 of the DC conversion circuit, the DC a second end of the first secondary circuit 105 of the conversion circuit is connected to the power battery 106, and a second secondary winding of the transformer 104 is connected to a first end of the second secondary circuit 107 of the DC conversion circuit, the DC a second end of the second secondary circuit 107 of the conversion circuit is coupled to the first end of the buck circuit 108, and a second end of the buck circuit 108 is coupled to the first end of the low voltage battery 109, the drop The second end of the pressure battery 109 is connected to the in-vehicle electric device 110 and the BMS 111, respectively.

The power grid 101, the power factor correction PFC circuit 102, the DC conversion circuit primary circuit 103, the DC conversion circuit first secondary circuit 105, the DC conversion circuit second secondary circuit 107, the transformer 104, the step-down circuit 108, the power battery 106, the low voltage battery 109 and the BMS 111 constitute a charging circuit for charging the whole vehicle; the power battery 106, the first secondary side circuit 105 of the DC conversion circuit, the second secondary side circuit 107 of the DC conversion circuit, the transformer 104, the step-down circuit 108, The low-voltage battery 109, the vehicle-mounted electric device 110 and the BMS 111 constitute a driving circuit for powering the car while the car is in motion.

The power factor correction PFC circuit 102 may be a power factor correction PFC circuit such as a bridgeless power factor correction PFC circuit.

The primary conversion circuit 103 of the DC conversion circuit may also be a primary circuit of any of the following:

The second secondary circuit 107 of the DC conversion circuit may also be a secondary circuit of any of the following:

Specifically, as shown in FIG. 2, FIG. 2 is a circuit schematic diagram of a multi-function integrated controller circuit proposed by the present invention. As shown, the power grid 101 includes a live line L and a neutral line N. The power factor correction PFC circuit 102 includes a first diode D1, a second diode D2, a third diode D3, and a fourth a pole tube D4, a fifth diode D5, a first capacitor C1, a second capacitor C2, a first inductor L1, and a first MOS transistor Q1, wherein:

The anode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is respectively connected to the anode of the fourth diode D4, the first The first end of the capacitor C1, the source of the first MOS transistor Q1, and the cathode of the second capacitor C2 are connected, and the cathode of the fourth diode D4 is connected to the anode of the third diode D3. The cathode of the third diode D3 is respectively connected to the cathode of the first diode D1, the second end of the first capacitor C1, and the first end of the first inductor L1, the first inductor The second end of L1 is respectively connected to the drain of the first MOS transistor Q1 and the anode of the fifth diode D5, and the cathode of the fifth diode D5 is connected to the anode of the fourth capacitor C4. .

The DC conversion circuit primary side circuit 103 includes a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5, a third capacitor C3, and a first switch K1, wherein:

a first end of the third capacitor C3 is connected to a first tap of a primary winding of the transformer T1, and a second tap of a primary winding of the transformer T1 is connected to a first end of the first switch K1, The second end of the first switch K1 is respectively connected to the source of the fourth MOS transistor Q4 and the drain of the fifth MOS transistor Q5, and the source of the fifth MOS transistor Q5 and the third MOS transistor The source of Q3 is connected and grounded, and the drain of the third MOS transistor Q3 is respectively connected to the source of the second MOS transistor Q2 and the second end of the third capacitor C3.

The first secondary circuit 105 of the DC conversion circuit includes a sixth MOS transistor Q6 and a seventh MOS transistor Q7, eighth MOS transistor Q8, ninth MOS transistor Q9, fourth capacitor C4, fifth capacitor C5, wherein:

a first tap of the first sub winding of the transformer T1 is connected to a first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is respectively connected to a drain of the seventh MOS transistor Q7. The source of the sixth MOS transistor Q6 is connected, and the drain of the sixth MOS transistor Q6 is respectively connected to the drain of the eighth MOS transistor Q8 and the first end of the fifth capacitor C5, and the fifth capacitor C5 The second end is respectively connected to the source of the seventh MOS transistor Q7, the source of the ninth MOS transistor Q9, and the second tap of the first sub winding of the transformer T1, and the drain of the ninth MOS transistor Q9. The source is connected to the third MOS transistor Q8 and the third tap of the first sub winding of the transformer T1.

The second secondary circuit 107 of the DC conversion circuit includes a sixth diode D6, a seventh diode D7, and a sixth capacitor C6, wherein:

a first tap of the second secondary winding of the transformer T1 is connected to a positive pole of the sixth diode D6, and a negative pole of the sixth diode D6 and a negative pole of the seventh diode D7 are respectively The first end of the sixth capacitor C6 is connected, and the second end of the sixth capacitor C6 is connected to the second tap of the second sub winding of the transformer T1, and the positive pole of the seventh diode D7 is The third tap of the second secondary winding of transformer T1 is connected.

The step-down circuit 108 includes a tenth MOS transistor Q10, an eighth diode D8, a second inductor L2, and a seventh capacitor C7, wherein:

The source of the tenth MOS transistor Q10 is respectively connected to the anode of the eighth diode D8 and the first end of the second inductor L2, and the second end of the second inductor L2 is opposite to the seventh The first end of the capacitor C7 is connected, and the second end of the seventh capacitor C7 is connected to the anode of the eighth diode D8.

Optionally, when the first switch K1 in the primary conversion circuit 103 of the DC conversion circuit is closed, the power grid 101 passes through the power factor correction PFC circuit 102, the DC conversion circuit primary circuit 103, the transformer 104, and the first secondary circuit of the DC conversion circuit. 105. Charging the power battery 106, and charging the low voltage battery 109 through the power factor correction PFC circuit 102, the DC conversion circuit primary circuit 103, the transformer 104, the DC conversion circuit first secondary circuit 105, and the step-down circuit 108. The battery 109 supplies power to the BMS to form a charging circuit. When the first switch K1 in the DC conversion circuit primary circuit 103 is turned off, the power battery 106 passes through the DC conversion circuit, the first secondary circuit 105, the transformer 104, and the DC conversion circuit. The secondary circuit 107 and the step-down circuit 108 supply power to the low voltage battery 109, and the low voltage battery 109 supplies power to the in-vehicle electric device 110 and the BMS 111 to constitute a driving circuit.

The embodiment of the present invention provides a multi-functional integrated controller circuit. In the circuit, the power grid 101, the power factor correction PFC circuit 102, the DC conversion circuit primary side circuit 103, the DC conversion circuit first secondary side circuit 105, The second secondary circuit 107 of the DC conversion circuit, the transformer 104, the step-down circuit 108, the power battery 106, the low voltage battery 109 and the BMS 111 constitute a charging circuit for charging the entire vehicle; the power battery 106 and the first secondary circuit of the DC conversion circuit 105. The DC converter circuit second secondary circuit 107, the transformer 104, the step-down circuit 108, the low voltage battery 109, the vehicle electrical equipment 110 and the BMS 111 form a driving circuit for powering the automobile while the vehicle is in motion. When the vehicle is being charged, the charging circuit works, the driving circuit does not work, the driving circuit works when the car is running, and the charging circuit does not work, so the charging circuit and the driving circuit can share the power battery 106 and the first secondary circuit 105 of the DC conversion circuit. The second secondary circuit 107 of the DC conversion circuit, the transformer 104, the step-down circuit 108, the low voltage battery 109 and the BMS 111 can reduce the circuit components, save the volume and reduce the cost, and at the same time, reduce the components to make the system Reliability is improved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

A multifunctional integrated controller circuit, characterized in that the circuit comprises a power grid, a power factor correction PFC circuit, a DC conversion circuit primary side circuit, a DC conversion circuit first secondary side circuit, and a DC conversion circuit second secondary side circuit , transformers, step-down circuits, power batteries, low-voltage batteries, automotive electrical equipment and BMS, of which:

The power grid is connected to the first end of the power factor correction PFC circuit, and the second end of the power factor correction PFC circuit is connected to the first end of the primary circuit of the DC conversion circuit, and the primary side of the DC conversion circuit a second end of the circuit is coupled to the primary winding of the transformer, a first secondary winding of the transformer is coupled to a first end of the first secondary circuit of the DC conversion circuit, the first secondary circuit of the DC conversion circuit a second end is connected to the power battery, a second auxiliary winding of the transformer is connected to a first end of the second secondary circuit of the DC conversion circuit, and a second end of the second secondary circuit of the DC conversion circuit is The first end of the step-down circuit is connected, the second end of the step-down circuit is connected to the first end of the low-voltage battery, and the second end of the step-down battery is respectively connected to the vehicle-mounted electric device and the Said BMS connection.
The multi-function integrated controller circuit according to claim 1, wherein said power factor correction PFC circuit comprises a first diode, a second diode, a third diode, and a fourth diode a fifth diode, a first capacitor, a second capacitor, a first inductor, and a first MOS transistor, wherein:

a positive electrode of the first diode is connected to a negative electrode of the second diode, and a positive electrode of the second diode is respectively connected to a positive electrode of the fourth diode and a first electrode of the first capacitor a terminal, a source of the first MOS transistor, a cathode of the second capacitor, a cathode of the fourth diode is connected to a cathode of the third diode, and a third diode The anode is connected to the cathode of the first diode, the second end of the first capacitor, and the first end of the first inductor, respectively, and the second end of the first inductor is respectively connected to the first MOS transistor The drain and the anode of the fifth diode are connected, and the cathode of the fifth diode is connected to the anode of the second capacitor.
The multi-function integrated controller circuit according to claim 1 or 2, wherein the power factor correction PFC circuit is also a bridgeless power factor correction PFC circuit.
The multi-function integrated controller circuit according to claim 1, wherein the primary conversion circuit of the DC conversion circuit comprises a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, and a third Capacitor, first switch, where:

a first end of the third capacitor is coupled to a first tap of a primary winding of the transformer, and a second tap of a primary winding of the transformer is coupled to a first end of the first switch, the first switch The second end is respectively connected to the source of the fourth MOS transistor and the drain of the fifth MOS transistor, and the source of the fifth MOS transistor is connected to the source of the third MOS transistor and grounded. The drains of the third MOS transistors are respectively connected to the source of the second MOS transistor and the second end of the third capacitor.
The multi-function integrated controller circuit according to claim 1 or 4, wherein the primary circuit of the DC conversion circuit can also be a primary circuit of any of the following:

Half-bridge resonant circuit, full-bridge phase shifting circuit, full-bridge resonant circuit and active clamp circuit.
The multi-function integrated controller circuit according to claim 1, wherein the first secondary side circuit of the direct current conversion circuit comprises a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, and a ninth MOS transistor. The fourth capacitor and the fifth capacitor, wherein:

a first tap of the first sub winding of the transformer is connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is respectively connected to a drain of the seventh MOS transistor and a sixth MOS transistor a source connection, a drain of the sixth MOS transistor is respectively connected to a drain of the eighth MOS transistor and a first end of the fifth capacitor, and a second end of the fifth capacitor is respectively connected to the seventh a source of the MOS transistor, a source of the ninth MOS transistor, a second tap of the first sub winding of the transformer, and a drain of the ninth MOS transistor and a source of the eighth MOS transistor The third tap connection of the first secondary winding of the transformer.
The multi-function integrated controller circuit according to claim 1, wherein the second secondary side circuit of the direct current conversion circuit comprises a sixth diode, a seventh diode, and a sixth capacitor, wherein:

a first tap of the second secondary winding of the transformer is connected to a positive pole of the sixth diode, and a negative pole of the sixth diode is respectively opposite to a negative pole and a sixth capacitor of the seventh diode a first end connection, the second end of the sixth capacitor being coupled to a second tap of the second secondary winding of the transformer, A positive pole of the seventh diode is coupled to a third tap of the second secondary winding of the transformer.
The multi-function integrated controller circuit according to claim 1 or 7, wherein the second secondary circuit of the DC conversion circuit is also a secondary circuit of any one of the following:

Half-bridge resonant circuit, full-bridge phase shifting circuit, full-bridge resonant circuit and active clamp circuit.
The multi-function integrated controller circuit according to claim 1, wherein the step-down circuit comprises a tenth MOS transistor, an eighth diode, a second inductor, and a seventh capacitor, wherein:

The source of the tenth MOS transistor is respectively connected to the anode of the eighth diode and the first end of the second inductor, and the second end of the second inductor and the first end of the seventh capacitor The terminal is connected, and the second end of the seventh capacitor is connected to the anode of the eighth diode.
The multi-function integrated controller circuit according to any one of claims 1 to 9, wherein the circuit comprises:

a live line of the power grid is respectively connected to a positive pole of the first diode of the power factor correction PFC circuit and a negative pole of the second diode, and a neutral line of the power grid and a third of the power factor correction PFC circuit respectively a positive pole of the diode and a negative pole of the fourth diode;

a positive pole of a second capacitor of the power factor correction PFC circuit is connected to a drain of a fourth MOS transistor of the primary circuit of the DC conversion circuit, and a cathode of the second capacitor is respectively connected to a primary circuit of the DC conversion circuit a source of the third MOS transistor and a source of the fifth MOS transistor are connected and grounded; a first end of the fifth capacitor of the first secondary circuit of the DC conversion circuit is connected to the power battery, and the fifth capacitor is The second end is connected to the power battery and grounded;

a first end of a sixth capacitor of the second secondary circuit of the DC conversion circuit is connected to a drain of a tenth MOS transistor of the buck circuit, and a second end of the sixth capacitor is respectively connected to the buck circuit Connecting the positive terminal of the eighth diode and the second end of the seventh capacitor;

The seventh capacitor of the step-down circuit is connected in parallel with the low voltage battery.