CN113910936A

CN113910936A - Vehicle-mounted charger and control method thereof

Info

Publication number: CN113910936A
Application number: CN202010657671.0A
Authority: CN
Inventors: 庞俊康; 周继云; 李兴朝
Original assignee: WM Smart Mobility Shanghai Co Ltd
Current assignee: WM Smart Mobility Shanghai Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-01-11

Abstract

The invention relates to a vehicle-mounted charger, a control method thereof and a computer readable storage medium. This on-vehicle machine that charges includes: the converter module is suitable for being connected with a power grid of the charging pile and a power battery of a vehicle; the auxiliary power supply is suitable for being connected with a power grid and a low-voltage storage battery of a vehicle, wherein the low-voltage storage battery is connected with a power tube of the converter module; and a control chip, wherein the power supply end of the control chip is suitable for being connected with a control connecting wire of the charging pile and is configured as follows: responding to the control pilot voltage of the charging pile, and awakening by using electric energy provided by the control pilot voltage; and sends a driving signal to the trigger switch to close the high-voltage switch of the charging pile. The power grid is connected to the current transformation module and the auxiliary power supply in response to the closing of the high-voltage switch, the auxiliary power supply is suitable for supplementing the low-voltage storage battery with electric energy provided by the power grid, and the supplemented low-voltage storage battery is suitable for supplying power to the power tube in a low-voltage mode so as to charge the power battery.

Description

Vehicle-mounted charger and control method thereof

Technical Field

The invention relates to a charging technology of an electric automobile, in particular to an On-Board Charger (OBC) and a control method of the OBC.

Background

In recent years, electric vehicles have been rapidly developed, and charging and discharging technologies thereof have been remarkably advanced. The charging and discharging technology of the electric vehicle is characterized by diversification, and can be roughly divided into two types of direct current charging and discharging and alternating current charging and discharging. The alternating current charging is usually realized by converting 220V or 380V alternating current into direct current required by a power battery through an on-board charger OBC, and common specifications comprise 3.3KW, 6.6KW, 11KW and 22 KW. The DC charging can utilize the DC/DC voltage transformation module to transform the input voltage provided by the charging pile into the adaptive charging voltage, thereby charging the power battery of the electric automobile.

In the prior art, a 12V low-voltage lead-acid battery is generally used to supply power to a vehicle-mounted controller, drive a main positive contactor and a main negative contactor of a power battery to be closed, and drive a vehicle-mounted charger or a power tube of a DC/DC voltage transformation module to charge the power battery of an electric vehicle. The lead-acid storage battery can be charged through a relay arranged on the power battery. Whether the charging is alternating current charging or direct current charging, the charging can work normally under the condition that the low-voltage power supply is normal.

However, once the lead-acid battery has a power shortage problem, a low-voltage power supply cannot be established. At this time, the electric vehicle cannot wake up the vehicle-mounted controller to perform charging operation, and the main positive contactor and the main negative contactor of the power battery of the electric vehicle cannot be closed. In this case, the electric vehicle cannot supplement the low-voltage lead storage battery with the insufficient power, and cannot charge the power battery.

In order to overcome the above defects in the prior art, there is a need in the art for a charging technology for an electric vehicle, which is used for performing emergency power compensation on a low-voltage storage battery with power loss to complete charging of a power battery of the electric vehicle.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In order to overcome the defects in the prior art, the invention provides a vehicle-mounted charger, a control method of the vehicle-mounted charger and a computer-readable storage medium, which are used for performing emergency power supplement on a low-voltage storage battery with power shortage so as to finish charging of a power battery of an electric automobile.

The invention provides the vehicle-mounted charger, which comprises: the converter module is suitable for being connected with a power grid of the charging pile and a power battery of a vehicle; the auxiliary power supply is suitable for being connected with the power grid and a low-voltage storage battery of the vehicle, wherein the low-voltage storage battery is connected with a power tube of the converter module; and a control chip, wherein the power supply end of the control chip is suitable for being connected with the control connecting wire of the charging pile and is configured as follows: responding to the control pilot voltage of the charging pile, and awakening by using electric energy provided by the control pilot voltage; and sending a driving signal to a trigger switch to close a high-voltage switch of the charging pile. The grid is connected to the converter module and the auxiliary power source in response to the closing of the high voltage switch. The auxiliary power supply is suitable for supplementing the low-voltage storage battery with electric energy provided by the power grid. The low-voltage storage battery after power supplement is suitable for supplying power to the power tube in a low-voltage mode so as to charge the power battery.

Optionally, in some embodiments of the present invention, the vehicle-mounted charger may further include: and the voltage division circuit is connected with the control connecting line, is suitable for converting the control pilot voltage into a power supply voltage and transmitting the power supply voltage to the power supply end of the control chip.

Preferably, in some embodiments of the present invention, the control chip may be further configured to: monitoring the voltage of the low-voltage battery; and controlling a power tube of the converter module to charge the power battery in response to the voltage of the low-voltage storage battery being higher than a preset voltage threshold.

Preferably, in some embodiments of the invention, the grid comprises, but is not limited to, an alternating current grid. The auxiliary power supply may include an AC/DC rectifying unit. The AC/DC rectifying unit is suitable for converting alternating current provided by the alternating current grid into direct current so as to supplement the low-voltage storage battery with power.

Preferably, in some embodiments of the present invention, the converter module may comprise a power factor corrector and an LLC isolation transformer. The control chip may be further configured to: controlling a power tube of the power factor corrector, converting the alternating current into direct current and eliminating higher harmonics of working current; and the power tube is used for controlling the LLC isolation transformer and converting the direct current output by the power factor corrector into high-voltage direct current to charge the power battery.

Optionally, in some embodiments of the invention, the converter module is adapted to be connected to the power battery via a main contactor. The low-voltage storage battery can be further connected with a power supply end of the control chip and a power supply end of a whole vehicle control unit and/or a battery management system of the vehicle. The control chip may be further configured to: in response to the voltage of the low-voltage storage battery being higher than the voltage threshold, turning off the auxiliary power supply and switching power supply from the low-voltage storage battery to the control chip; and requesting a charging command to the vehicle control unit in response to the voltage of the low-voltage battery being higher than the voltage threshold; and/or in response to the voltage of the low-voltage battery being above the voltage threshold, requesting a command to the battery management system to close the main contactor, wherein the power cell is connected to the output of the converter module in response to the closing of the main contactor.

Optionally, in some embodiments of the present invention, the power supply terminal of the control chip may be further connected to the output terminal of the auxiliary power supply. The control chip may be further configured to: and responding to the output voltage of the auxiliary power supply, and switching to supply power to the control chip by the auxiliary power supply.

According to another aspect of the invention, the invention further provides a control method of the vehicle-mounted charger.

The control method of the vehicle-mounted charger provided by the invention comprises the following steps: responding to the control pilot voltage of the charging pile, and awakening a control chip of the vehicle-mounted charger by using electric energy provided by the control pilot voltage; and the control chip sends a driving signal to the trigger switch to close the high-voltage switch of the charging pile. And the power grid of the charging pile is connected to the current transformation module and the auxiliary power supply of the vehicle-mounted charger in response to the closing of the high-voltage switch. The auxiliary power supply is adapted to supplement the low-voltage battery of the vehicle with electric energy provided by the grid. The low-voltage storage battery after power supplement is suitable for supplying power to the power tube of the converter module in a low-voltage mode so as to charge a power battery of the vehicle.

Preferably, in some embodiments of the present invention, the control method may further include: monitoring the voltage of the low-voltage battery; and controlling a power tube of the converter module to charge the power battery in response to the voltage of the low-voltage storage battery being higher than a preset voltage threshold.

Preferably, in some embodiments of the invention, the grid comprises, but is not limited to, an alternating current grid. The auxiliary power supply may include an AC/DC rectifying unit. The control method may further include: and controlling the AC/DC rectifying unit to convert the alternating current provided by the alternating current grid into direct current so as to supplement the power to the low-voltage storage battery.

Preferably, in some embodiments of the present invention, the converter module may comprise a power factor corrector and an LLC isolation transformer. The step of controlling the power tube to charge the power battery may include: controlling a power tube of the power factor corrector, converting the alternating current into direct current and eliminating higher harmonics of working current; and the power tube is used for controlling the LLC isolation transformer and converting the direct current output by the power factor corrector into high-voltage direct current to charge the power battery.

Optionally, in some embodiments of the invention, the converter module is adapted to be connected to the power battery via a main contactor. The low-voltage storage battery can be further connected with a power supply end of the control chip and a power supply end of a whole vehicle control unit and/or a battery management system of the vehicle. The control method may further include: in response to the voltage of the low-voltage storage battery being higher than the voltage threshold, turning off the auxiliary power supply and switching power supply from the low-voltage storage battery to the control chip; and in response to the voltage of the low-voltage battery being above the voltage threshold, requesting a command to the vehicle control unit to charge the power battery; and/or in response to the voltage of the low-voltage battery being above the voltage threshold, requesting a command to the battery management system to close the main contactor, wherein the power cell is connected to the output of the converter module in response to the closing of the main contactor.

Optionally, in some embodiments of the present invention, the power supply terminal of the control chip may be further connected to the output terminal of the auxiliary power supply. The control method further comprises the following steps: and responding to the output voltage of the auxiliary power supply, and switching to supply power to the control chip by the auxiliary power supply.

According to another aspect of the present invention, a computer-readable storage medium is also provided herein.

The present invention provides the above computer readable storage medium having stored thereon computer instructions. When the computer instructions are executed by the processor, the control method provided by any one of the above embodiments can be implemented to perform emergency power compensation on a low-voltage storage battery with power shortage, so as to complete charging of a power battery of an electric vehicle.

Drawings

The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.

Fig. 1 shows a schematic diagram of an architecture for charging a power battery by using an onboard charger according to some embodiments of the present invention.

Fig. 2 is a flow chart illustrating a control method of an onboard charger according to some embodiments of the present invention.

Fig. 3 illustrates a schematic flow diagram for charging a power battery according to some embodiments of the invention.

Reference numerals:

10 vehicle-mounted charger;

11 a current transformation module;

12 an auxiliary power supply;

s1 control switch;

s2 trigger switch;

a PFC power factor corrector;

LLC LLC LLC isolation transformer;

20, charging piles;

k, a high-voltage switch;

30 power batteries;

40 low-voltage storage batteries;

201-202 steps of a control method of a vehicle-mounted charger.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in connection with the preferred embodiments, there is no intent to limit its features to those embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Additionally, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," "vertical" and the like as used in the following description are to be understood as referring to the segment and the associated drawings in the illustrated orientation. The relative terms are used for convenience of description only and do not imply that the described apparatus should be constructed or operated in a particular orientation and therefore should not be construed as limiting the invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers and/or sections should not be limited by these terms, but rather are used to distinguish one element, region, layer and/or section from another element, region, layer and/or section. Thus, a first component, region, layer or section discussed below could be termed a second component, region, layer or section without departing from some embodiments of the present invention.

As described above, in the prior art, both ac charging and dc charging need to be performed normally under the condition that the low-voltage power supply is normal. Once the low-voltage lead-acid storage battery has a power shortage problem, low-voltage power supply cannot be established. At this time, the electric vehicle cannot wake up the vehicle-mounted controller to perform charging operation, and the main positive contactor and the main negative contactor of the power battery of the electric vehicle cannot be closed. In this case, the electric vehicle cannot supplement the low-voltage lead storage battery with the insufficient power, and cannot charge the power battery.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating an architecture for charging a power battery by using an on-board charger according to some embodiments of the present invention.

As shown in fig. 1, the vehicle-mounted charger 10 provided by the present invention includes an inverter module 11, an auxiliary power supply 12, and a control chip (not shown). The converter module 11 can be connected to the power grid of the charging pile 20 and the power battery 30 of the vehicle, and is suitable for charging the power battery 30 of the vehicle by using the electric energy provided by the power grid of the charging pile 20. The auxiliary power source 12 may be connected to a power grid and a low-voltage battery 40 of the vehicle, and is adapted to supplement power to the low-voltage battery 40 with insufficient power by using electric energy provided by the power grid, so that the low-voltage battery 40 supplies power to each power tube of the converter module 11. The power supply terminal of the Control chip can be connected to the Control connection line of the charging pile 20, and is adapted to wake up the charging pile by using the electric energy of the Control Pilot (CP) voltage provided by the Control connection line, and send a driving signal to the trigger switch S2 to close the high-voltage switch K of the charging pile 20. In response to the closing of the high voltage switch K, the grid of the charging pile 20 will be connected to the converter module 11 and the auxiliary power supply 12 of the on-board charger 10 to start the recharging of the low voltage battery 40 and the charging of the power battery 30.

In some embodiments of the present invention, the low voltage battery 40 may be a 12V low voltage lead acid battery. The low-voltage battery 40 may be connected to each power tube of the converter module 11, and is configured to supply power to each power tube of the converter module 11 to charge the power battery 30. In some embodiments, the low-voltage Battery 40 may further be connected to a Vehicle Control Unit (VCU), a Battery Management System (BMS), and a power supply terminal of the Control chip, and is configured to perform low-voltage power supply for the Vehicle Control Unit VCU, the BMS, and the Control chip, so as to support the Vehicle-mounted charger 10 to charge the power Battery 30.

The specific process of replenishing the low-voltage battery 40 will be described below in conjunction with some control methods of the on-board charger. It will be appreciated by those skilled in the art that these control methods are only some non-limiting examples provided by the present invention, and are intended to clearly demonstrate the broad concepts of the present invention and to provide some detailed illustrations of its implementation by the public without limiting the scope of protection of the present invention.

Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a control method of a vehicle-mounted charger according to some embodiments of the present invention.

As shown in fig. 2, the control method of the vehicle-mounted charger provided by the present invention may include step 201: responding to the control pilot voltage of the charging pile, and awakening by using electric energy provided by the control pilot voltage.

As described above, when the low-voltage battery has a power shortage problem, the vehicle-mounted controller and the power tube in the prior art will be dormant because the low-voltage power supply cannot be established. At this time, even if the user inserts the charging gun of the charging pile 20 into the charging interface of the electric vehicle, the vehicle-mounted controller and each power tube cannot be waken up to operate.

In some embodiments of the present invention, the power supply terminal of the control chip may be connected to the control connection line of the charging gun through the voltage dividing circuit shown in fig. 1. When a user inserts the charging gun into a charging interface of the electric automobile, the 12V direct current CP voltage is transmitted to the electric automobile end through a control connecting wire of the charging gun, and is divided into 9V power supply voltage under the action of the voltage dividing resistor R3. The 9V supply voltage can be transmitted to the supply terminal of the control chip, thereby serving as a power supply to supply power to the control chip.

The control chip can adopt a low-power processor powered by 9V to wake up in response to the power supply of the CP voltage. In some embodiments, the awakened control chip may monitor the voltage of the low voltage battery 40 to determine if a power loss problem occurs with the low voltage battery 40. In response to the voltage of the low-voltage battery 30 being lower than a preset first voltage threshold (e.g., 11.5V), the control chip may determine that a power shortage problem has occurred in the low-voltage battery 40 and begin to implement a scheme for emergency power supplement for the low-voltage battery 40 of the power shortage.

As shown in fig. 2, the control method of the vehicle-mounted charger provided by the present invention may further include step 202: and sending a driving signal to the trigger switch, and closing a high-voltage switch of the charging pile so as to connect the power grid to the current transformation module and the auxiliary power supply.

In the emergency power supplement scheme, in response to the judgment that the low-voltage storage battery 40 has a power shortage problem, the control chip may send a driving signal to the trigger switch S2 to drive the trigger switch S2 to close. According to the national standard, the charging pile 20 can detect the on-off state of the trigger switch S2 in real time, and close the high-voltage switch K of the charging pile 20 within 3 seconds of detecting the closing of the trigger switch S2. In response to the closing of the high voltage switch K, the high voltage grid of the charging pile 20 is connected to the converter module 11 and the auxiliary power supply 12 of the vehicle-mounted charger 10, so as to supply power to the converter module 11 and the auxiliary power supply 12.

In response to the supply of the high-voltage network, the auxiliary power supply 12 starts operating, replenishing the low-voltage battery 40 of the vehicle with electric energy supplied by the high-voltage network. The voltage of the low-voltage battery 40 will gradually increase as the replenishing proceeds. In response to the voltage of the low-voltage battery 40 rising to the preset second voltage threshold, the low-voltage battery 40 after power supplement starts to supply power to the power tube of the converter module 11 at a low voltage so as to support the converter module 11 to charge the power battery 30 of the vehicle.

As shown in fig. 1, in some embodiments, in response to the closing of the high voltage switch K, the control switch S1 on the charging post 20 side will switch to the PWM signal side to output the CP voltage in PWM form. To address the problem of power supply to the control chip, the control chip may automatically switch power supplied by the auxiliary power supply 12 in response to the auxiliary power supply 12 generating an output voltage. In this case, even if the CP voltage is changed to the PWM control signal, the control chip does not affect the control of each power transistor of the inverter module 11.

Referring further to fig. 3, fig. 3 is a schematic flow chart illustrating charging of a power battery according to some embodiments of the invention.

As shown in fig. 3, in some embodiments of the control method, the control chip may continue to monitor the voltage of the low-voltage battery 40 in response to operation of the auxiliary power supply 12. In response to that the voltage of the low-voltage storage battery 40 is higher than a preset second voltage threshold (for example, 12V), the control chip may determine that the low-voltage storage battery 40 recovers to normal operation, and may perform low-voltage power supply on the control chip and the plurality of power tubes of the converter module 11 to implement normal charging on the power battery 30.

Specifically, in response to the voltage of the low-voltage battery 40 reaching the second voltage threshold of 12V, the control chip may turn off the auxiliary power supply 12 and switch the power supplied to the control chip by the low-voltage battery 40 after the power supply. Meanwhile, the control chip may request a charging command from the vehicle control unit VCU to control each power tube of the converter module 11 to charge the power battery 30. Furthermore, the control chip may also request a command to close the main contactor from the battery management system BMS for closing the main contactor to connect the power battery 30 to the output of the converter module 11.

As shown in fig. 1, in some embodiments of the present invention, the grid of the charging pile 20 may use a 220V ac grid. The auxiliary power supply 12 may include an AC/DC rectification unit adapted to convert 220V AC power provided by the AC power grid into 14V/3A DC power for recharging the low voltage battery 40.

In some embodiments, the converter module 11 may include a Power Factor Corrector (PFC) and an LLC isolation transformer. The LLC isolation transformer LLC can realize DC/DC isolation transformation between input voltage and output voltage by using a transformer isolation mode.

As shown in fig. 3, in some embodiments of the control method, in response to the establishment of the 12V low-voltage power supply of the low-voltage battery 40, the control chip may control the power switch tube of the PFC to operate, so as to convert the 220V ac power input from the ac power grid into the dc PFC voltage. And then, the control chip can control a power switch tube of the LLC isolation transformer LLC to work, isolate and convert the direct current PFC voltage output by the PFC into the high-voltage direct current (HVDC) voltage required by the power battery pack, and output the high-voltage direct current (PFC) voltage to a power battery of the electric automobile for charging. That is, the control chip can control the power tube of the inverter module 11 to convert the ac power into the high-voltage dc power to charge the power battery 30. It will be appreciated that by AC/DC rectifying 220V AC power from the AC grid input by means of the PFC, higher harmonics in the operating current can preferably be eliminated, thereby avoiding disturbances to the grid.

As shown in fig. 1, in response to a closing command provided by the battery management system BMS, the main positive and negative contactors of the power battery 30 will close, thereby connecting the power battery 30 to the output of the converter module 11, i.e. the HVDC terminal in fig. 1. The converter module 11 can use the power provided by the grid of the charging pile 20 to charge the power battery 30.

While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.

Although the control chip described in the above embodiments may be implemented by a combination of software and hardware. It is understood that the control chip may be implemented solely in software or hardware. For a hardware implementation, the control chip may be implemented on one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), digital signal processing devices (DAPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic devices designed to perform the functions described herein, or a selected combination thereof. For software implementation, the control chip may be implemented by separate software modules, such as program modules (procedures) and function modules (functions), running on a common chip, each of which performs one or more of the functions and operations described herein.

The present invention provides the above computer readable storage medium having stored thereon computer instructions. When executed by the processor, the computer instructions may implement the control method provided in any of the above embodiments, so as to perform emergency power compensation on a low-voltage battery with power shortage, so as to complete charging of a power battery of an electric vehicle.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a vehicle-mounted charger which characterized in that includes:

the converter module is suitable for being connected with a power grid of the charging pile and a power battery of a vehicle;

the auxiliary power supply is suitable for being connected with the power grid and a low-voltage storage battery of the vehicle, wherein the low-voltage storage battery is connected with a power tube of the converter module; and

control chip, its supply end is suitable for and connects fill electric pile's control connection line to the configuration is: responding to the control pilot voltage of the charging pile, and awakening by using electric energy provided by the control pilot voltage; and sends a driving signal to a trigger switch to close a high-voltage switch of the charging pile,

the power grid is connected to the converter module and the auxiliary power supply in response to the closing of the high-voltage switch, the auxiliary power supply is suitable for supplementing the low-voltage storage battery with electric energy provided by the power grid, and the supplemented low-voltage storage battery is suitable for supplying power to the power tube in a low-voltage mode to charge the power battery.

2. The vehicle-mounted charger according to claim 1, characterized by further comprising:

and the voltage division circuit is connected with the control connecting line, is suitable for converting the control pilot voltage into a power supply voltage and transmitting the power supply voltage to the power supply end of the control chip.

3. The vehicle-mounted charger according to claim 1, wherein the control chip is further configured to:

monitoring the voltage of the low-voltage battery; and

and controlling a power tube of the converter module to charge the power battery in response to the voltage of the low-voltage storage battery being higher than a preset voltage threshold.

4. The vehicle-mounted charger according to claim 3, characterized in that said electric network comprises an alternating current network and said auxiliary power supply comprises an AC/DC rectifying unit adapted to convert the alternating current supplied by said alternating current network into direct current to replenish said low-voltage accumulator.

5. The vehicle-mounted charger according to claim 4, wherein said converter module comprises a power factor corrector and an LLC isolation transformer, said control chip being further configured to:

controlling a power tube of the power factor corrector, converting the alternating current into direct current and eliminating higher harmonics of working current; and

and controlling a power tube of the LLC isolation transformer to convert the direct current output by the power factor corrector into high-voltage direct current so as to charge the power battery.

6. The vehicle-mounted charger according to claim 3, wherein the converter module is adapted to be connected to the power battery through a main contactor, the low-voltage battery is further connected to a power supply terminal of the control chip, and a power supply terminal of a vehicle control unit and/or a battery management system of the vehicle, and the control chip is further configured to:

in response to the voltage of the low-voltage storage battery being higher than the voltage threshold, turning off the auxiliary power supply and switching power supply from the low-voltage storage battery to the control chip; and

requesting a charging command to the vehicle control unit in response to the voltage of the low-voltage battery being higher than the voltage threshold; and/or

In response to the voltage of the low-voltage battery being above the voltage threshold, requesting a command to the battery management system to close the main contactor, wherein the power cell is connected to the output of the converter module in response to the closing of the main contactor.

7. The vehicle-mounted charger according to claim 1, wherein a power supply terminal of the control chip is further connected to an output terminal of the auxiliary power supply, and the control chip is further configured to:

and responding to the output voltage of the auxiliary power supply, and switching to supply power to the control chip by the auxiliary power supply.

8. A control method of a vehicle-mounted charger is characterized by comprising the following steps:

responding to the control pilot voltage of the charging pile, and awakening a control chip of the vehicle-mounted charger by using electric energy provided by the control pilot voltage; and

the control chip sends a driving signal to a trigger switch to close a high-voltage switch of the charging pile, wherein a power grid of the charging pile is connected to a current transformation module and an auxiliary power supply of the vehicle-mounted charger in response to the closing of the high-voltage switch, the auxiliary power supply is suitable for supplementing power to a low-voltage storage battery of a vehicle by using electric energy provided by the power grid, and the low-voltage storage battery after power supplementation is suitable for supplying power to a power tube of the current transformation module at low voltage so as to charge a power battery of the vehicle.

9. The control method according to claim 8, further comprising:

monitoring the voltage of the low-voltage battery; and

10. The control method of claim 9, wherein the power grid comprises an alternating current power grid, the auxiliary power source comprises an AC/DC rectification unit, the control method further comprising:

and controlling the AC/DC rectifying unit to convert the alternating current provided by the alternating current grid into direct current so as to supplement the power to the low-voltage storage battery.

11. The control method according to claim 10, wherein the converter module comprises a power factor corrector and an LLC isolation transformer, and the step of controlling the power tube to charge the power battery comprises:

12. The control method according to claim 9, wherein the converter module is adapted to be connected to the power battery through a main contactor, the low-voltage battery is further connected to a power supply terminal of the control chip, and a power supply terminal of a vehicle control unit and/or a battery management system of the vehicle, and the control method further comprises:

requesting a command to charge the power battery from the vehicle control unit in response to the voltage of the low-voltage battery being higher than the voltage threshold; and/or

13. The control method of claim 8, wherein the power supply terminal of the control chip is further connected to an output terminal of the auxiliary power supply, the control method further comprising:

14. A computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the control method of any one of claims 8 to 13.