WO2017101835A1

WO2017101835A1 - Electric automobile, on-board charger thereof, and on-board charger control method

Info

Publication number: WO2017101835A1
Application number: PCT/CN2016/110268
Authority: WO
Inventors: 王兴辉
Original assignee: 比亚迪股份有限公司
Priority date: 2015-12-18
Filing date: 2016-12-16
Publication date: 2017-06-22
Also published as: CN106891738B; CN106891738A

Abstract

Disclosed is an electric automobile on-board charger control method. The control method comprises: when a power battery is charging, obtaining a first total charging time TA for controlling an H bridge via a first mode and a second total charging time TB for controlling the H bridge via a second mode; according to a relationship between TA and TB, selecting a mode to control the H bridge in order to control first to fourth switches; when the power battery is discharging externally, obtaining a first discharging setting time Tm for controlling the H bridge via the first mode and a second discharging setting time Tn for controlling the H bridge via the second mode; performing alternating control on the H bridge according to Tm and Tn in order to perform temperature equalisation control on the first to fourth switches. Also disclosed are an electric automobile, and an on-board charger thereof.

Description

Electric vehicle and its vehicle charger and vehicle charger control method

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. 20151095596, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of electric vehicle technology, and in particular, to a method for controlling an electric vehicle vehicle charger, an electric vehicle vehicle charger, and an electric vehicle.

Background technique

With the commercialization of electric vehicles, electric vehicle car chargers have become one of the important parts of electric vehicles.

Among them, there are many methods for charging the whole vehicle by controlling the vehicle charger and discharging the whole vehicle, and most of the related technologies adopt the control method of the single-phase H-bridge, and the control method using the single-phase H-bridge generally includes the bipolar. Sexual control methods and unipolar control methods.

However, when the bipolar control method is adopted, the four switching tubes in the H-bridge are in the high-frequency switching state, the switching loss is high, and the heat loss is large; when using the unipolar control method, although to some extent Solve the heat loss of the switch tube when the bipolar control method is used, but the four switch tubes in the H bridge are always controlled in a fixed manner during charging or discharging of the whole vehicle, and some of the switch tubes in the H bridge need to be turned off with current. The overheating problem of the switch with current shutdown cannot be effectively solved.

Therefore, regardless of whether the bipolar control method or the unipolar control method is adopted, the heating problem of the switching tube in the H-bridge cannot be effectively solved, and the working life of the switching tube is affected.

Summary of the invention

The present application aims to solve at least one of the technical problems in the above-mentioned techniques to some extent. Therefore, the first object of the present application is to provide a control method for an electric vehicle vehicle charger, which can make the heat generation of the first to fourth switch tubes in the H bridge relatively balanced, and improve the working life of the switch tube in the H bridge. .

A second object of the present application is to provide an electric vehicle car charger. A third object of the present application is to propose an electric vehicle.

In order to achieve the above object, an embodiment of the present application provides a method for controlling an electric vehicle vehicle charger, wherein the vehicle charger includes an H-bridge, and the H-bridge includes a first switch tube, a second switch tube, and a third Switch tube and fourth open The control method includes: when the vehicle charger charges the power battery of the electric vehicle, acquiring a first charging total time TA of the H bridge in a first manner and controlling in a second manner a second charging total time TB of the H-bridge; selecting a manner of controlling the H-bridge according to a relationship between the first charging total time TA and the second charging total time TB, to a switch tube, a second switch tube, a third switch tube and a fourth switch tube perform temperature equalization control; when the power battery of the electric vehicle is externally discharged through the vehicle charger, obtaining the first mode to control the a first discharge set time Tm of the H-bridge and a second discharge set time Tn of the H-bridge in a second manner; the H-bridge according to the first discharge set time Tm and the second discharge set time Tn Performing alternate control to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube, wherein the first discharge set time Tm and the second discharge set time Tn are For the discharge process Each pre-discharge cycle.

According to the control method of the electric vehicle vehicle charger according to the embodiment of the present application, when the power battery is charged, the first charging total time TA of controlling the H bridge in the first manner and the second charging total time of controlling the H bridge in the second manner are acquired. TB, and selecting a manner of controlling the H bridge according to a relationship between the first charging total time TA and the second charging total time TB, to the first switching tube, the second switching tube, the third switching tube, and the fourth switch The tube performs temperature equalization control; when the power battery is externally discharged, obtaining a first discharge set time Tm for controlling the H bridge in a first manner and a second discharge set time Tn for controlling the H bridge in a second manner, and according to the first discharge setting The time Tm and the second discharge set time Tn alternately control the H-bridge to perform temperature equalization control on the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor. Therefore, the heat generation of each switch tube is relatively balanced, thereby improving the working life of the switch tube in the H-bridge, thereby extending the life cycle of the vehicle charger.

In order to achieve the above object, an electric vehicle vehicle charger according to another embodiment of the present application includes: an H-bridge, the H-bridge includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch. a controller for acquiring a first total charging time TA of the H-bridge in a first manner and controlling in a second manner when the vehicle charger charges the power battery of the electric vehicle a second charging total time TB of the H-bridge, and selecting a manner of controlling the H-bridge according to a relationship between the first charging total time TA and the second charging total time TB, to The first switch tube, the second switch tube, the third switch tube, and the fourth switch tube perform temperature equalization control, and are further configured to obtain the first when the power battery of the electric vehicle is externally discharged through the vehicle charger Controlling a first discharge set time Tm of the H-bridge and controlling a second discharge set time Tn of the H-bridge in a second manner, and according to the first discharge set time Tm and the second discharge set time Tn Performing on the H bridge Controlling to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube, wherein the first discharge set time Tm and the second discharge set time Tn are Each discharge cycle during discharge is preset.

According to the electric vehicle vehicle charger of the embodiment of the present application, when the power battery is charged, the controller acquires the first charging total time TA of controlling the H bridge in the first manner and the second charging total time TB of controlling the H bridge in the second manner. And selecting a manner of controlling the H bridge according to a relationship between the first charging total time TA and the second charging total time TB, to the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube Performing temperature equalization control, and when the power battery is externally discharged, the controller acquires a first discharge set time Tm that controls the H bridge in a first manner and a second discharge set time Tn that controls the H bridge in a second manner, and according to the first The discharge setting time Tm and the second discharge setting time Tn alternately control the H-bridge to perform temperature equalization control on the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube, so that the heating of each switching tube Relative balance, improve the working life of the switch tube in the H-bridge, thereby extending the life cycle of the car charger.

In addition, an embodiment of the present application also proposes an electric vehicle including the above-described electric vehicle on-board charger.

In the electric vehicle of the embodiment of the present application, when the power battery is charged and discharged by the above-mentioned vehicle charger, the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube in the H-bridge can be realized. The temperature equalization control makes the heat generation of each switch tube relatively balanced, and improves the working life of the switch tube in the H bridge, thereby extending the life cycle of the vehicle charger.

DRAWINGS

1 is a circuit diagram of an electric vehicle vehicle charger according to an embodiment of the present application;

2 is a circuit diagram of an electric vehicle vehicle charger according to another embodiment of the present application;

3 is a circuit diagram of an electric vehicle vehicle charger according to still another embodiment of the present application;

4 is a flowchart of a method for controlling an electric vehicle on-board charger according to an embodiment of the present application;

5 is a schematic diagram of control waveforms of four switching tubes when the H-bridge is controlled to charge the power battery in the first mode according to an embodiment of the present application;

6 is a schematic diagram showing control waveforms of four switching tubes when the H-bridge is controlled to charge the power battery in the second mode according to an embodiment of the present application;

7 is a control flow chart when a power battery is charged by a vehicle charger according to an embodiment of the present application;

8 is a schematic diagram showing control waveforms of four switching tubes when the H-bridge is controlled in the first manner to discharge the power battery to the outside according to an embodiment of the present application;

9 is a schematic diagram showing control waveforms of four switching tubes when the H-bridge is controlled in a second manner to discharge the power battery to the outside according to an embodiment of the present application;

10 is a flow of control when a power battery is externally discharged by a vehicle charger according to an embodiment of the present application. Cheng Tu.

detailed description

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting.

A control method of an electric vehicle vehicle charger proposed in the embodiment of the present application, an electric vehicle vehicle charger, and an electric vehicle having the same are described below with reference to the accompanying drawings.

1 to 3 illustrate a connection manner of an electric vehicle vehicle charger according to an embodiment of the present application. As shown in FIG. 1 to FIG. 3 , an electric vehicle vehicle charger according to an embodiment of the present application includes an H bridge, and the H bridge includes a first switch tube T1, a second switch tube T2, a third switch tube T3, and a fourth switch tube T4. . As shown in FIG. 1 , the electric vehicle vehicle charger includes a first inductor L1 and a second inductor L2, wherein the first end of the first inductor L1 is connected to one end of the load or the positive end of the AC grid AC, and the second inductor L2 is One end is connected to the other end of the load or the negative end of the AC grid AC, and the second end of the first inductor L1 and the second end of the second inductor L2 are respectively connected to the H bridge. As shown in FIG. 2, the electric vehicle vehicle charger includes only one inductor such as the first inductor L1, wherein the first end of the first inductor L1 is connected to one end of the load or the positive end of the AC grid AC, and the second end of the first inductor L1. The end is connected to the H bridge. As shown in FIG. 3, the electric vehicle vehicle charger includes only one inductor, such as the first inductor L1, wherein the first end of the first inductor L1 is connected to the other end of the load or the negative terminal of the AC grid AC, and the first inductor L1 is The two ends are connected to the H bridge. When the vehicle charger charges the power battery of the electric vehicle, the AC power can be supplied by the AC power grid; when the power battery is discharged to the outside through the vehicle charger, it can be discharged into the AC grid by grid-connected discharge, or it can be off-grid. The inverter, ie the inverter, supplies power to the load.

4 is a flow chart of a method of controlling an electric vehicle on-board charger according to an embodiment of the present application. As shown in FIG. 4, the control method of the electric vehicle vehicle charger of the embodiment of the present application includes:

S1. When the vehicle charger charges the power battery of the electric vehicle, obtain the first charging total time TA of controlling the H bridge in the first manner and the second charging total time TB of controlling the H bridge in the second manner.

According to an embodiment of the present application, the control waveforms of the four switching tubes when the H-bridge is controlled in the first manner to charge the power battery are as shown in FIG. 5. When the H-bridge is controlled in the first mode A, when the instantaneous voltage of the grid supplied to the on-board charger is greater than 0, the first switch tube T1 is controlled to be always on, and the second switch tube T2 is controlled to be always off, and the control The three switch tubes T3 and the fourth switch tube T4 are alternately turned on and off alternately, wherein when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off, the PWM waveform of the third switch tube T3 is controlled. The PWM waveform of the fourth switching transistor T4 is complementary, and the duty ratio of the PWM waveform for controlling the third switching transistor T3 is changed from large to small, and the duty ratio of the PWM waveform for controlling the fourth switching transistor T4 is changed from small to large. Small; when the instantaneous voltage of the grid supplied to the vehicle charger is less than 0, the third switch T3 is controlled to be always on, and the fourth switch T4 is controlled. In the always-off state, and controlling the first switch tube T1 and the second switch tube T2 to be alternately turned on and off, wherein when the first switch tube T1 and the second switch tube T2 are alternately turned on and off, the control is performed. The PWM waveform of the first switching transistor T1 and the PWM waveform of the second switching transistor T2 are complementary, and the duty ratio of the PWM waveform of the first switching transistor T1 is controlled to become larger and smaller, and the PWM waveform of the second switching transistor T2 is controlled. The duty cycle increases from small to small.

According to an embodiment of the present application, the control waveforms of the four switching tubes when the H-bridge is controlled in the second mode to charge the power battery are as shown in FIG. 6. When the H-bridge is controlled in the second mode B, when the instantaneous voltage of the grid supplied to the on-board charger is greater than 0, the second switch T2 is controlled to be in the always-on state, and the first switch T1 is controlled to be in the always-off state, and the control is performed. The three switch tubes T3 and the fourth switch tube T4 are alternately turned on and off alternately, wherein when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off, the PWM waveform of the third switch tube T3 is controlled. The PWM waveform of the fourth switching transistor T4 is complementary, and the duty ratio of the PWM waveform for controlling the third switching transistor T3 is changed from small to large, and the duty ratio of the PWM waveform for controlling the fourth switching transistor T4 is changed from large to small. When the instantaneous voltage of the grid supplied to the vehicle charger is less than 0, the fourth switch tube T4 is controlled to be in the always-on state, and the third switch tube T3 is controlled to be in the always-off state, and the first switch tube T1 and the second switch are controlled. The tube T2 is alternately turned on and off, wherein when the first switch tube T1 and the second switch tube T2 are alternately turned on and off, the PWM waveform of the first switch tube T1 and the PWM waveform of the second switch tube T2 are controlled. Complementary and control first The duty ratio of the PWM waveform of the switching transistor T1 is changed from small to small, and the duty ratio of the PWM waveform that controls the second switching transistor T2 is changed from large to small.

S2, selecting a manner of controlling the H bridge according to a relationship between the total charging total time TA and the second charging total time TB, to the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube Perform temperature equalization control.

In a specific implementation, S2 specifically includes the following:

S21: Select a mode for controlling the H bridge from the first mode A or the second mode B according to a relationship between the first charging total time TA and the second charging total time TB;

S22: Control the H bridge according to the selected manner to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube.

It should be noted that, in the process of charging the power battery by the vehicle charger, if only the first mode A is used to control the H bridge, when the instantaneous value of the grid voltage is greater than 0, the first switch tube T1 remains open, and the second switch The tube T2 is kept turned off, and the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off alternately, and the inductor in the vehicle charger is charged when the third switch tube T3 is turned on and the fourth switch tube T4 is turned off. When the third switch tube T3 is turned off and the fourth switch tube T4 is turned on, the inductor is discharged; when the instantaneous value of the grid voltage is less than 0, the third switch tube T3 is kept open, and the fourth switch tube T4 is kept turned off, the first switch tube T1 and the second switching tube T2 are alternately turned on and off alternately, and the inductor in the vehicle charger is charged when the first switching tube T1 is turned on and the second switching tube T2 is turned off, and the first switching tube T1 is turned off, and the second is turned off. The inductor discharges when the switch tube T2 is turned on. Since the inductor is charged when the first switch transistor T1 and the third switch transistor T3 are turned on, the turn-on duty ratio is large, so the first switch transistor T1 and the third switch transistor T3 may overheat.

Similarly, in the process of charging the power battery by the vehicle charger, if only the second mode B is used to control the H bridge, when the instantaneous value of the grid voltage is greater than 0, the first switch tube T1 remains off, and the second switch tube T2 is kept open, and the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off alternately, and the inductor in the vehicle charger is charged when the fourth switch tube T4 is turned on and the third switch tube T3 is turned off. When the fourth switch tube T4 is turned off and the third switch tube T3 is turned on, the inductor is discharged; when the instantaneous value of the grid voltage is less than 0, the fourth switch tube T4 is kept open, and the third switch tube T3 is kept turned off, the first switch tube T1 and The second switch tube T2 is alternately turned on and off alternately, and the inductor in the vehicle charger is charged when the second switch tube T2 is turned on, and the first switch tube T1 is turned off, and the second switch tube T2 is turned off, and the first switch tube is turned off. The inductor discharges when T1 is turned on. Since the inductor is charged when the second switch tube T2 and the fourth switch tube T4 are turned on, the turn-on duty ratio is large, so the second switch tube T2 and the fourth switch tube T4 are overheated.

Therefore, in the embodiment of the present application, when the H-bridge is controlled by the first mode A to enable the vehicle charger to charge the power battery, the time for controlling the H-bridge by the first mode A is recorded, so that the One mode controls the first charging total time TA of the H bridge, and then stores; when the second mode B controls the H bridge to enable the vehicle charger to charge the power battery, the second mode B is used to control the H bridge. Time, so that the second total charging time TB of the H-bridge is controlled in the second way, and then stored. Then, the relationship between the first charging total time TA and the second charging total time TB is determined, and finally, the manner of controlling the H bridge is selected according to the relationship between the first charging total time TA and the second charging total time TB, thereby realizing Temperature equalization control is performed on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube.

According to an embodiment of the present application, the manner of controlling the H bridge is selected according to the relationship between the total charging total time TA and the second total charging time TB, specifically, when the first charging total time TA is greater than the second charging total. When the time TB is selected, the second mode is selected to control the H bridge; when the first total charging time TA is less than the second total charging time TB, the first mode is selected to control the H bridge; when the first charging total time TA is equal to the second When the total charging time TB is selected, the first mode or the second mode is selected to control the H bridge.

Specifically, according to an embodiment of the present application, as shown in FIG. 7, the foregoing control method of the electric vehicle on-board charger includes:

S501, charging the open wave, that is, when the vehicle charger charges the power battery, it is necessary to output a control waveform to control the switch tube in the H-bridge.

S502. The first charging total time TA of controlling the H bridge in the first mode A and the second charging total time TB of the H bridge in the second mode B are read.

S503. Determine whether the first total charging time TA is greater than the second total charging time TB. If yes, execute S504; if no, execute S508.

S504, selecting the second mode B to control the H bridge.

S505, the car charger charges the power battery.

S506. Determine whether the charging process ends. If yes, execute S507; if no, return to S505.

S507. Record the current charging time, so as to update the second charging total time TB according to the second charging total time TB obtained from the storage area at the start of the charging plus the current charging time.

S508. Determine whether the first total charging time TA is less than the second total charging time TB. If yes, execute S509; if no, execute S513.

S509: Select the first mode A to control the H bridge.

S510, the car charger charges the power battery.

S511, determining whether the current charging process is finished. If yes, execute S512; if no, return to S510.

S512, the current charging time is recorded, so that the first charging total time TA is updated according to the first charging total time TA obtained from the storage area at the start of the current charging plus the current charging time.

S513, selecting the first mode A or the second mode B to control the H bridge.

S514, the car charger charges the power battery.

S515, determining whether the charging process ends. If yes, execute S516; if no, return to S514.

S516, recording the charging time. Wherein, if the first mode A is selected for the H-bridge control, the first charging total time TA is updated according to the first charging total time TA obtained from the storage area at the start of the current charging, and the current charging time is updated; The second mode B controls the H-bridge to update the second total charging time TB according to the second charging total time TB acquired from the storage area at the start of the charging plus the current charging time.

Therefore, by recording whether the H-bridge is controlled in the first mode or the second mode each time charging, and recording the first charging total time TA when using the first mode and the second charging total time TB when using the second mode, Then, the relationship between the first charging total time TA and the second charging total time TB is judged, thereby selecting a method for controlling the H-bridge, and the switching tubes T1 and T2 in the H-bridge can be realized in the entire life cycle of the vehicle charger. The heat generation and overcurrent of T3 and T4 are relatively balanced, so that the working life of the vehicle charger can be increased and the failure rate can be reduced.

S3. When the power battery of the electric vehicle is externally discharged by the vehicle charger, the first discharge set time Tm for controlling the H bridge in the first manner and the second discharge set time Tn for controlling the H bridge in the second manner are obtained.

According to an embodiment of the present application, the control waveform of the four switching tubes when the H-bridge is controlled in the first manner to discharge the power battery to the outside is as shown in FIG. 8. When the H-bridge is controlled in the first mode A, when the external discharge instantaneous voltage of the on-vehicle charger is greater than 0, the first switch tube T1 is controlled to be always on, and the second switch tube T2 is controlled to be always off, and the control is performed. The three switch tubes T3 and the fourth switch tube T4 are alternately turned on and off alternately, wherein when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off, the PWM waveform of the third switch tube T3 is controlled. The PWM waveform of the fourth switching transistor T4 is complementary, and the duty ratio of the PWM waveform for controlling the third switching transistor T3 is changed from large to small, and the duty ratio of the PWM waveform for controlling the fourth switching transistor T4 is changed from small to large. Small; when the external discharge instantaneous voltage of the vehicle charger is less than 0, the third switch tube T3 is controlled to be always open, and the fourth switch tube is controlled. T4 is in the always-off state, and controls the first switch tube T1 and the second switch tube T2 to be alternately turned on and off alternately, wherein when the first switch tube T1 and the second switch tube T2 are alternately turned on and off, Controlling the PWM waveform of the first switching transistor T1 and the PWM waveform of the second switching transistor T2 are complementary, and controlling the duty ratio of the PWM waveform of the first switching transistor T1 to become larger and smaller, and controlling the PWM of the second switching transistor T2 The duty cycle of the waveform changes from small to small.

Further, the control waveform of the four switching tubes when the H-bridge is controlled in the second manner to discharge the power battery to the outside is as shown in FIG. When the H-bridge is controlled in the second mode B, when the external discharge instantaneous voltage of the vehicle charger is greater than 0, the second switching transistor T2 is controlled to be in the always-on state, and the first switching transistor T1 is controlled to be in the always-off state, and the control is performed. The three switch tubes T3 and the fourth switch tube T4 are alternately turned on and off alternately, wherein when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off, the PWM waveform of the third switch tube T3 is controlled. The PWM waveform of the fourth switching transistor T4 is complementary, and the duty ratio of the PWM waveform for controlling the third switching transistor T3 is changed from small to large, and the duty ratio of the PWM waveform for controlling the fourth switching transistor T4 is changed from large to small. When the external discharge instantaneous voltage of the vehicle charger is less than 0, the fourth switch tube T4 is controlled to be in the always-on state, and the third switch tube T3 is controlled to be in the always-off state, and the first switch tube T1 and the second switch are controlled. The tube T2 is alternately turned on and off, wherein when the first switch tube T1 and the second switch tube T2 are alternately turned on and off, the PWM waveform of the first switch tube T1 and the PWM waveform of the second switch tube T2 are controlled. Complementary and control first The duty ratio of the PWM waveform of the switching transistor T1 is changed from small to small, and the duty ratio of the PWM waveform that controls the second switching transistor T2 is changed from large to small.

S4, alternately controlling the H-bridge according to the first discharge set time Tm and the second discharge set time Tn to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube.

It should be noted that, in the process of discharging the power battery through the vehicle charger, if only the first mode A is used to control the H bridge, and the instantaneous value of the external discharge voltage is greater than 0, the first switch tube T1 remains open, The second switch tube T2 is kept turned off, and the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off alternately, and the inductor in the vehicle charger is turned on when the third switch tube T3 is turned off and the fourth switch tube T4 is turned on. Charging, when the third switch tube T3 is turned on, and the fourth switch tube T4 is turned off, the inductor is discharged; when the instantaneous value of the external discharge voltage is less than 0, the third switch tube T3 is kept open, and the fourth switch tube T4 is kept turned off, the first A switch tube T1 and a second switch tube T2 are alternately turned on and off, and when the first switch tube T1 is turned off and the second switch tube T2 is turned on, the inductor in the vehicle charger is charged, and the first switch tube T1 is turned on, The inductor is discharged when the second switching transistor T2 is turned off. Since the inductor is charged when the second switch tube T2 and the fourth switch tube T4 are turned on, the second switch tube T2 and the fourth switch tube T4 are turned off with a current to perform a hard switch, so the second switch tube T2 and the fourth switch tube T4 will overheat.

Similarly, in the process of discharging the power battery through the vehicle charger, if only the second mode B is used to control the H-bridge, and the instantaneous value of the external discharge voltage is greater than 0, the first switching tube T1 remains turned off, and the second The switch tube T2 is kept open, and the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off alternately, and the inductor in the vehicle charger is charged when the fourth switch tube T4 is turned off and the third switch tube T3 is turned on. The fourth switch tube T4 is opened and opened third. When the T3 is turned off, the inductor discharges; when the instantaneous value of the external discharge voltage is less than 0, the fourth switch tube T4 is kept open, the third switch tube T3 is kept turned off, and the first switch tube T1 and the second switch tube T2 are alternately complementary. Turning on and off, and charging the inductor in the vehicle charger when the second switching transistor T2 is turned off and the first switching transistor T1 is turned on, and the inductor is discharged when the second switching transistor T2 is turned on and the first switching transistor T1 is turned off. Since the first switch tube T1 and the third switch tube T3 are charged when the first switch tube T1 and the third switch tube T3 are turned on, the first switch tube T1 and the third switch tube T3 are turned off with a current to perform a hard switch, so the first switch tube T1 and the third switch tube T3 will overheat.

Therefore, in the embodiment of the present application, each time the power battery is externally discharged by the vehicle charger, the first discharge set time Tm and the second discharge set time Tn are first set, and then the power battery is discharged to the outside through the vehicle charger. In the first mode, the H-bridge can be controlled by the first mode A to discharge the power battery through the vehicle charger until the time when the first bridge A is controlled by the first mode A reaches the first discharge set time Tm, and the switch is adopted. The second mode B controls the H bridge to discharge the power battery through the vehicle charger until the time for controlling the H bridge by the second mode B reaches the second discharge set time Tn, thus completing a discharge cycle (ie, one discharge cycle) Time = Tm + Tn), and then switch to control the H bridge by the first mode A to discharge the power battery through the vehicle charger until the time when the first mode A is used to control the H bridge reaches the first discharge setting time Tm, then switch to use the second mode B to control the H-bridge to discharge the power battery through the car charger until the second mode is adopted B controls the time of the H bridge to reach the second discharge set time Tn, ..., and so on, to achieve alternate control of the H bridge, thereby realizing the first switch tube, the second switch tube, the third switch tube, and the The four switch tubes perform temperature equalization control. Of course, in the process of external discharge of the power battery, the second mode B can also be used to control the H bridge to discharge the power battery through the vehicle charger until the second mode B controls the H bridge. The second discharge setting time Tn is switched to control the H bridge by using the first mode A to discharge the power battery through the vehicle charger until the time when the H-bridge is controlled by the first mode A reaches the first discharge set time Tm, A discharge cycle is thus completed and repeated in accordance with such a discharge cycle until the discharge of the power battery is completed.

That is, the alternate control of the H-bridge according to the first discharge set time Tm and the second discharge set time Tn in the above S2 includes: when the time of controlling the H-bridge by the first mode reaches the first discharge set time Tm, The second mode controls the H bridge until the time for controlling the H bridge in the second mode reaches the second discharge set time Tn; or when the time for controlling the H bridge in the second mode reaches the second discharge set time Tn, the first The mode controls the H bridge until the time for controlling the H bridge in the first mode reaches the first discharge set time Tm.

According to an embodiment of the present application, controlling the first discharge set time Tm of the H-bridge in the first manner may be equal to controlling the second discharge set time Tn of the H-bridge in the second manner.

Specifically, according to an embodiment of the present application, as shown in FIG. 10, the foregoing control method of the electric vehicle on-board charger includes:

S801, discharge open wave, that is, when the power battery is externally discharged through the car charger, it is necessary to output a control waveform to The switch tube in the H-bridge is controlled.

S802, setting a first discharge set time Tm and a second discharge set time Tn.

S803, the first mode A is used to control the H bridge to discharge the power battery through the vehicle charger.

S804. Determine whether the time for controlling the H bridge by using the first mode A reaches the first discharge setting time Tm. If yes, execute S805; if no, return to S803.

S805, judging whether the current discharge is finished during the discharging process, if yes, executing S809, and if not, executing S806.

S806, the second mode B is used to control the H bridge to discharge the power battery through the vehicle charger.

S807. Determine whether the time for controlling the H bridge by using the second mode B reaches the second discharge setting time Tn. If yes, execute S808; if no, return to S806.

S808, judging whether the current discharge is finished during the discharging process, if yes, executing S809, and if not, executing S803.

S809, the discharge process ends.

Therefore, the control method of the electric vehicle vehicle charger of the embodiment of the present application can ensure that the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are heated during the external discharge process of the power battery through the vehicle charger each time. Relative balance, improve the working life of the car charger.

As shown in FIG. 1 to FIG. 3, an electric vehicle vehicle charger according to an embodiment of the present application includes an H-bridge and a controller such as an MCU (Micro Control Unit). The H bridge includes a first switch tube T1, a second switch tube T2, a third switch tube T3, and a fourth switch tube T4. The controller is configured to acquire a first charging total time TA for controlling the H bridge in a first manner and a second charging total time TB for controlling the H bridge in a second manner when the vehicle charger charges the power battery of the electric vehicle, and according to The relationship between the first charging total time TA and the second charging total time TB selects a manner of controlling the H bridge to the first switching tube T1, the second switching tube T2, the third switching tube T3, and the fourth switching tube. T4 performs temperature equalization control, and is also used to obtain a first discharge set time Tm for controlling the H bridge in a first manner and a second control H bridge in a second manner when the power battery of the electric vehicle is externally discharged by the vehicle charger. Discharging the set time Tn, and alternately controlling the H bridge according to the first discharge set time Tm and the second discharge set time Tn to the first switch The tube T1, the second switch tube T2, the third switch tube T3, and the fourth switch tube T4 perform temperature equalization control, wherein the first discharge set time Tm and the second discharge set time Tn are pre-charged for each discharge cycle in the discharge process Set.

According to an embodiment of the present application, the controller selects a mode for controlling the H bridge according to a relationship between the first charging total time TA and the second charging total time TB, wherein when the first charging total time TA is greater than the second When the total charging time is TB, the controller selects the second mode to control the H bridge; when the first charging total time TA is less than the second charging total time TB, the controller selects the first mode to control the H bridge; when the first charging When the total time TA is equal to the second total charging time TB, the controller selects the first mode or the second mode to control the H-bridge.

That is, in the embodiment of the present application, the controller controls the H-bridge by using the first mode A to enable the vehicle charger to charge the power battery, and records the time when the H-bridge is controlled by the first mode A, thereby The first charging total time TA of the H bridge can be controlled in the first manner, and then stored; the controller uses the second mode B to control the H bridge to enable the vehicle charger to charge the power battery, and the second mode B is recorded. The time during which the H-bridge is controlled, so that the second total charging time TB of the H-bridge is controlled in the second manner, and then stored. Then, the controller determines a relationship between the first charging total time TA and the second charging total time TB, and finally selects a mode for controlling the H bridge according to the relationship between the first charging total time TA and the second charging total time TB, Thereby, temperature equalization control is performed on the first switch tube, the second switch tube, the third switch tube and the fourth switch tube.

According to an embodiment of the present application, when the controller controls the H-bridge in the first manner, when the grid instantaneous voltage supplied to the on-vehicle charger is greater than 0, the controller controls the first switch tube T1 to be in the always-on state, and controls the first The second switch tube T2 is in the always off state, and the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off, wherein the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off. When the time is off, the PWM waveform of the third switching transistor T3 is controlled to be complementary to the PWM waveform of the fourth switching transistor T4, and the duty ratio of the PWM waveform of the third switching transistor T3 is controlled to be larger and smaller, and the fourth switching transistor is controlled. The duty ratio of the PWM waveform of T4 is changed from small to small and smaller; when the instantaneous voltage of the grid supplied to the vehicle charger is less than 0, the controller controls the third switching transistor T3 to be in the always-on state, and controls the fourth switching tube T4 to be in the same state. Turning off the state, and controlling the first switch tube T1 and the second switch tube T2 to alternately turn on and off, wherein the first switch is controlled when the first switch tube T1 and the second switch tube T2 are alternately turned on and off. switch The PWM waveform of T1 and the PWM waveform of the second switching transistor T2 are complementary, and the duty ratio of the PWM waveform of the first switching transistor T1 is controlled to be larger and smaller, and the duty ratio of the PWM waveform of the second switching transistor T2 is controlled. From small to large, then smaller.

Moreover, when the controller controls the H-bridge in the second mode, when the grid instantaneous voltage supplied to the on-board charger is greater than 0, the controller controls the second switch tube T2 to be in the always-on state, and controls the first switch tube T1 to be in the same state. Turning off the state, and controlling the third switch tube T3 and the fourth switch tube T4 to alternately turn on and off, wherein the third switch is controlled when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off. The PWM waveform of the switching transistor T3 is complementary to the PWM waveform of the fourth switching transistor T4, and the duty ratio of the PWM waveform controlling the third switching transistor T3 is changed from small to large. Further, the duty ratio of the PWM waveform for controlling the fourth switching transistor T4 is changed from large to small and larger; when the instantaneous voltage of the grid supplied to the vehicle charger is less than 0, the controller controls the fourth switching transistor T4 to be always turned on. And controlling the third switch tube T3 to be in the always off state, and controlling the first switch tube T1 and the second switch tube T2 to alternately turn on and off alternately, wherein the first switch tube T1 and the second switch tube T2 are alternately controlled. When the switching is turned on and off, the PWM waveform of the first switching transistor T1 and the PWM waveform of the second switching transistor T2 are complementary, and the duty ratio of the PWM waveform of the first switching transistor T1 is controlled to be smaller and smaller, and the control is controlled. The duty ratio of the PWM waveform of the second switching transistor T2 is changed from large to small.

According to an embodiment of the present application, the controller alternately controls the H bridge according to the first discharge set time Tm and the second discharge set time Tn, wherein the time when the H bridge is controlled by the first mode reaches the first discharge set time In the case of Tm, the H-bridge is controlled in the second mode until the time when the H-bridge is controlled in the second mode reaches the second discharge set time Tn; or when the time in which the H-bridge is controlled in the second mode reaches the second discharge set-time Tn The H-bridge is controlled in the first manner until the time when the H-bridge is controlled in the first manner reaches the first discharge set time Tm.

That is, in the embodiment of the present application, each time the power battery is externally discharged through the vehicle charger, the controller first sets the first discharge set time Tm and the second discharge set time Tn, and then passes the on-board charger in the power battery. In the process of external discharge, the first mode A can be used to control the H bridge to discharge the power battery through the vehicle charger until the time when the first mode A is used to control the H bridge reaches the first discharge set time Tm. Switching to the second mode B to control the H-bridge to discharge the power battery through the vehicle charger until the second mode B controls the H-bridge to reach the second discharge set time Tn, thus completing a discharge cycle ( That is, one discharge cycle time = Tm + Tn), and then switch to control the H bridge by the first mode A to discharge the power battery through the car charger until the time of controlling the H bridge by the first mode A reaches the first time. a discharge set time Tm, and then switch to use the second mode B to control the H bridge to discharge the power battery through the car charger until the The time for controlling the H-bridge by the second mode B reaches the second discharge set time Tn, ..., and so on, to realize the alternate control of the H-bridge, thereby realizing the first switch tube, the second switch tube, and the third The switch tube and the fourth switch tube perform temperature equalization control. Of course, in the process of external discharge of the power battery, the second mode B can also be used to control the H bridge to discharge the power battery through the vehicle charger until the second mode B controls the H bridge. The second discharge setting time Tn is switched to control the H bridge by using the first mode A to discharge the power battery through the vehicle charger until the time when the H-bridge is controlled by the first mode A reaches the first discharge set time Tm, A discharge cycle is thus completed and repeated in accordance with such a discharge cycle until the discharge of the power battery is completed.

Wherein, the first discharge set time Tm of controlling the H bridge in the first manner may be equal to the second discharge set time Tn of controlling the H bridge in the second manner.

According to an embodiment of the present application, when the controller controls the H-bridge in the first manner, when the external discharge instantaneous voltage of the on-board charger is greater than 0, the controller controls the first switch T1 to be always on, and controls the first Two switch The tube T2 is in the always-off state, and the third switching tube T3 and the fourth switching tube T4 are alternately turned on and off, wherein when the third switching tube T3 and the fourth switching tube T4 are alternately turned on and off. The PWM waveform of the third switching transistor T3 is controlled to be complementary to the PWM waveform of the fourth switching transistor T4, and the duty ratio of the PWM waveform of the third switching transistor T3 is controlled to be larger and smaller, and the fourth switching transistor T4 is controlled. The duty ratio of the PWM waveform changes from small to small and becomes smaller; when the external discharge instantaneous voltage of the vehicle charger is less than 0, the controller controls the third switching tube T3 to be in the always-on state, and controls the fourth switching tube T4 to be always turned off. a state, and controlling the first switch tube T1 and the second switch tube T2 to alternately turn on and off, wherein the first switch tube is controlled when the first switch tube T1 and the second switch tube T2 are alternately turned on and off. The PWM waveform of T1 and the PWM waveform of the second switching transistor T2 are complementary, and the duty ratio of the PWM waveform of the first switching transistor T1 is controlled to be larger and smaller, and the duty ratio of the PWM waveform of the second switching transistor T2 is controlled. From small to large, then smaller.

When the controller controls the H-bridge in the second mode, when the external discharge instantaneous voltage of the vehicle charger is greater than 0, the controller controls the second switch tube T2 to be in the always-on state, and controls the first switch tube T1 to be always turned off. a state, and controlling the third switch tube T3 and the fourth switch tube T4 to be alternately turned on and off, wherein the third switch tube is controlled when the third switch tube T3 and the fourth switch tube T4 are alternately turned on and off. The PWM waveform of T3 is complementary to the PWM waveform of the fourth switching transistor T4, and the duty ratio of the PWM waveform that controls the third switching transistor T3 is changed from small to large, and the duty ratio of the PWM waveform of the fourth switching transistor T4 is controlled from When the external discharge instantaneous voltage of the vehicle charger is less than 0, the controller controls the fourth switching tube T4 to be in the always-on state, and controls the third switching tube T3 to be in the always-off state, and controls the first The switch tube T1 and the second switch tube T2 are alternately turned on and off alternately, wherein the PWM waveform and the first switch tube T1 are controlled when the first switch tube T1 and the second switch tube T2 are alternately turned on and off. Two switch tube T2 Complementary PWM waveforms, and controls the duty cycle of the PWM waveform of the first switching transistor T1 becomes small large small then, controls the second switching transistor T2 is then the duty ratio of the PWM waveform increases from large to small.

In the embodiment of the present application, as shown in FIG. 1 or FIG. 2 or FIG. 3, the first switch tube T1, the second switch tube T2, the third switch tube T3, and the fourth switch tube T4 are all IGBTs (Insulated Gate Bipolar). Transistor, insulated gate bipolar transistor), of course, in other embodiments of the present application, the first switch transistor T1, the second switch transistor T2, the third switch transistor T3, and the fourth switch transistor T4 may also be MOS transistors.

According to the electric vehicle vehicle charger of the embodiment of the present application, when the power battery is charged, the controller acquires the first charging total time TA of controlling the H bridge in the first manner and the second charging total time TB of controlling the H bridge in the second manner. And selecting a manner of controlling the H bridge according to a relationship between the first charging total time TA and the second charging total time TB, to the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube Performing temperature equalization control, and when the power battery is externally discharged, the controller acquires a first discharge set time Tm that controls the H bridge in a first manner and a second discharge set time Tn that controls the H bridge in a second manner, and according to the first The discharge setting time Tm and the second discharge setting time Tn alternately control the H-bridge to perform temperature equalization control on the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor The system makes the heat generation of each switch tube relatively balanced, and improves the working life of the switch tube in the H-bridge, thereby extending the life cycle of the vehicle charger.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the indications of "radial", "circumferential", etc., is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present application and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood on a case-by-case basis.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, in the case of non-contradictory situations, A person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples.

While the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the present application. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A control method for an electric vehicle vehicle charger, characterized in that the vehicle charger includes an H-bridge, and the H-bridge includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube. The control methods include:

Obtaining, when the vehicle charger charges the power battery of the electric vehicle, a first charging total time TA of controlling the H bridge in a first manner and controlling a second charging total of the H bridge in a second manner Time TB;

Selecting a manner of controlling the H bridge according to a relationship between the first total charging time TA and the second charging total time TB, to the first switch tube, the second switch tube, and the third switch The tube and the fourth switch tube perform temperature equalization control;

When the power battery of the electric vehicle is externally discharged by the vehicle charger, acquiring a first discharge set time Tm for controlling the H bridge in a first manner and controlling a second discharge of the H bridge in a second manner Setting time Tn;

Performing alternate control of the H-bridge according to the first discharge set time Tm and the second discharge set time Tn to perform the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube The temperature equalization control, wherein the first discharge set time Tm and the second discharge set time Tn are preset for each discharge cycle in the discharge process.
The method of controlling an electric vehicle on-board charger according to claim 1, wherein the controlling the H-bridge is controlled according to a relationship between the first total charging time TA and the second total charging time TB The method of performing temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube, including:

Selecting a mode for controlling the H bridge from the first mode A or the second mode B according to the relationship between the first charging total time TA and the second charging total time TB;

The H-bridge is controlled according to the selected manner to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube.
The control method for an electric vehicle on-board charger according to claim 1 or 2, wherein the H-bridge is selected according to a relationship between the first total charging time TA and the second total charging time TB The way to control, including:

When the first charging total time TA is greater than the second charging total time TB, selecting the second mode to control the H-bridge;

When the first charging total time TA is less than the second charging total time TB, selecting the first mode to control the H bridge;

When the first total charging time TA is equal to the second charging total time TB, the first mode or the second mode is selected to control the H-bridge.
A method of controlling an electric vehicle vehicle charger according to any one of claims 1 to 3, characterized in that The alternate control of the H-bridge according to the first discharge set time Tm and the second discharge set time Tn includes:

When the time when the H-bridge is controlled by the first mode reaches the first discharge set time Tm, the H-bridge is controlled by using the second mode until the H is controlled by the second mode. The time of the bridge reaches the second discharge set time Tn; or

When the time when the H-bridge is controlled by the second mode reaches the second discharge set time Tn, the H-bridge is controlled by using the first mode until the H is controlled by the first mode. The time of the bridge reaches the first discharge set time Tm.
The method of controlling an on-vehicle charger for an electric vehicle according to any one of claims 1 to 4, wherein, when the H-bridge is controlled in the first mode, wherein

When the grid instantaneous voltage supplied to the vehicle charger is greater than 0 or the external discharge transient voltage of the vehicle charger is greater than 0, the first switch tube is controlled to be in an open state, and the second switch tube is controlled to be in a constant state. Turning off the state, and controlling the third switch tube and the fourth switch tube to alternately turn on and off;

When the instantaneous voltage of the grid supplied to the on-board charger is less than 0 or the external discharge instantaneous voltage of the on-board charger is less than 0, the third switch tube is controlled to be in an open state, and the fourth switch tube is controlled to be in a constant state. Turning off the state, and controlling the first switch tube and the second switch tube to alternately turn on and off.
The method of controlling an on-vehicle charger for an electric vehicle according to any one of claims 1 to 4, wherein, when the H-bridge is controlled in the second manner, wherein

When the grid instantaneous voltage supplied to the vehicle charger is greater than 0 or the external discharge transient voltage of the vehicle charger is greater than 0, the second switch tube is controlled to be in an open state, and the first switch tube is controlled to be always Turning off the state, and controlling the third switch tube and the fourth switch tube to alternately turn on and off;

When the instantaneous voltage of the grid supplied to the on-board charger is less than 0 or the external discharge instantaneous voltage of the on-board charger is less than 0, the fourth switch is controlled to be in an open state, and the third switch is controlled to be in a constant state. Turning off the state, and controlling the first switch tube and the second switch tube to alternately turn on and off.
The method of controlling an on-vehicle charger for an electric vehicle according to any one of claims 1 to 6, wherein said first discharge setting time Tm of said H-bridge is controlled in said first manner to be equal to said The second mode controls the second discharge set time Tn of the H-bridge.
An electric vehicle vehicle charger, comprising:

H bridge, the H bridge includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;

a controller, configured to acquire a first charging total time TA of the H bridge in a first manner and a second manner to control the H bridge when the vehicle charger charges the power battery of the electric vehicle a second charging total time TB, and selecting the H-bridge into the relationship according to the relationship between the first charging total time TA and the second charging total time TB Row control mode for temperature equalization control of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, and also for charging the power battery of the electric vehicle through the vehicle Obtaining a first discharge set time Tm for controlling the H bridge in a first manner and a second discharge set time Tn for controlling the H bridge in a second manner when discharging the device, and setting a time Tm according to the first discharge And controlling, by the second discharge set time Tn, the H-bridge to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube, wherein the first The discharge set time Tm and the second discharge set time Tn are preset for each discharge cycle in the discharge process.
The electric vehicle vehicle charger according to claim 8, wherein the controller is further configured to:

Selecting a mode for controlling the H bridge from the first mode A or the second mode B according to the relationship between the first charging total time TA and the second charging total time TB;

The H-bridge is controlled according to the selected manner to perform temperature equalization control on the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube.
The electric vehicle vehicle charger according to claim 8 or 9, wherein the controller is configured to:

When the first charging total time TA is greater than the second charging total time TB, selecting the second mode to control the H-bridge;

When the first charging total time TA is less than the second charging total time TB, selecting the first mode to control the H bridge;

When the first total charging time TA is equal to the second charging total time TB, the first mode or the second mode is selected to control the H-bridge.
The electric vehicle vehicle charger according to any one of claims 8 to 10, wherein the controller is further configured to:

When the time when the H-bridge is controlled by the first mode reaches the first discharge set time Tm, the H-bridge is controlled by using the second mode until the H is controlled by the second mode. The time of the bridge reaches the second discharge set time Tn; or

When the time when the H-bridge is controlled by the second mode reaches the second discharge set time Tn, the H-bridge is controlled by using the first mode until the H is controlled by the first mode. The time of the bridge reaches the first discharge set time Tm.
The electric vehicle vehicle charger according to any one of claims 8 to 11, wherein the controller is further configured to:

When the grid instantaneous voltage supplied to the vehicle charger is greater than 0 or the external discharge transient voltage of the vehicle charger is greater than 0, the controller controls the first switch tube to be in an open state and control the second The switch tube is in an always-off state, and the third switch tube and the fourth switch tube are alternately turned on and off;

When the grid instantaneous voltage supplied to the on-vehicle charger is less than 0 or the external discharge instantaneous voltage of the on-board charger is less than 0, the controller controls the third switch tube to be in an open state and control the fourth The switch tube is in an always-off state, and the first switch tube and the second switch tube are controlled to be alternately turned on and off.
The electric vehicle vehicle charger according to any one of claims 8 to 11, wherein the controller is further configured to:

When the grid instantaneous voltage supplied to the on-vehicle charger is greater than 0 or the external discharge transient voltage of the on-board charger is greater than 0, the controller controls the second switch tube to be in an open state and control the first The switch tube is in an always-off state, and the third switch tube and the fourth switch tube are alternately turned on and off;

When the grid instantaneous voltage supplied to the on-vehicle charger is less than 0 or the external discharge transient voltage of the on-board charger is less than 0, the controller controls the fourth switch tube to be in an open state and control the third The switch tube is in an always-off state, and the first switch tube and the second switch tube are controlled to be alternately turned on and off.
The electric vehicle on-board charger according to any one of claims 8 to 13, wherein the first discharge setting time Tm of the H-bridge is controlled in the first manner to be equal to the second mode The second discharge set time Tn of the H-bridge is controlled.
An electric vehicle characterized by comprising the electric vehicle on-board charger according to any one of claims 8 to 14.