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A power-off method for an on-board charging system of an electric vehicle

A vehicle-mounted charging and electric vehicle technology, which is applied in electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of low power-off steps and low power-off efficiency, and achieve clear content and high power-off efficiency High, executable effects

Active Publication Date: 2022-07-29
DONGFENG AUTOMOBILE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages and problems of the prior art that the power-off step is not enforceable and the power-off efficiency is low, and to provide a power-off step with strong executability and high power-off efficiency The power-off method of the electric vehicle on-board charging system

Method used

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  • A power-off method for an on-board charging system of an electric vehicle
  • A power-off method for an on-board charging system of an electric vehicle
  • A power-off method for an on-board charging system of an electric vehicle

Examples

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Embodiment 1

[0053] see image 3 In terms of hardware, the present invention includes a power battery, an AC charging device, an OBC, a VCM and a BMS, a low-voltage power supply 4 is connected between the BAT+ and BAT- interfaces on the OBC, and the CC interface, CP The interfaces are respectively connected with VCM and one end of diode 5, the other end of VCM is connected with CAN_H and CAN_L interfaces on OBC, at the same time, CAN_H and CAN_L interfaces are connected with BMS, and the other end of diode 5 is connected with CP on OBC One end of the interface, the No. 1 resistor 1 and the No. 2 resistor 2 are connected, the other end of the No. 2 resistor 2 is connected with the BAT-interface, and the other end of the No. 1 resistor 1 is connected with one end of the No. 1 switch 31 in the relay 3. , the other end of the No. 1 switch 31 is connected to the BAT-interface, and the two ends of the No. 1 coil 32 in the relay 3 are respectively connected to the REQ switch and the ground termin...

Embodiment 2

[0065] The basic content is the same as that of Example 1, except that:

[0066] The condition range also includes that the CV small current command is greater than the actual output current.

Embodiment 3

[0068] The basic content is the same as that of Example 1, except that:

[0069] The power-off method further includes a normal power-off strategy, where the normal power-off strategy means that the BMS or the VCM actively issues an instruction to the OBC to stop charging.

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PUM

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Abstract

A power-off method for an on-board charging system of an electric vehicle, the power-off method includes any one or both of a power-off strategy caused by a fault and a normal power-off strategy, wherein the power-off strategy caused by a fault refers to : If the OBC in the charging process detects that the power-off trigger condition is established, the OBC first stops the high-voltage charging, and then reports the idle state to the BMS through the OBC_Status message, and returns to the idle state. Then, if the ignition switch is in the OFF state, the OBC sends the The BMS sends a network management message, and makes the REQ switch state OFF to control the No. 1 coil, thereby disconnecting the No. 1 switch and completing the power-off. The present design not only has a strong power-off step, but also has a high power-off efficiency.

Description

technical field [0001] The invention relates to a power-off design of an on-board charging device, belongs to the field of new energy, and in particular relates to a power-off method for an on-board charging system of an electric vehicle. Background technique [0002] As the country's requirements for air quality are getting higher and higher, it is also a big challenge to the automotive industry, so the development of new energy vehicles is very necessary. Now the market for new energy vehicles is getting bigger and bigger, and the development potential is huge. Electric vehicles rely on electricity as energy to drive vehicles, which can reduce the use of gasoline and is the development trend of the automotive industry. The on-board charging system can convert household alternating current into high-voltage direct current to supply power for the power battery, which flexibly solves the problem of electric vehicle charging. Therefore, the on-board charging system is the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/00B60L53/00B60L53/20
CPCB60L3/00B60L53/00B60L53/20Y02T90/14
Inventor 肖聪金力黎新汪斌苏磊王为才徐远林凌
Owner DONGFENG AUTOMOBILE COMPANY
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