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Active short-circuit protection circuit of electric automobile

A protection circuit and active short-circuit technology, which is applied in electric vehicles, emergency protection circuit devices, electrical devices, etc., can solve the problems of voltage rise at both ends of the battery, battery overvoltage damage, etc., and achieve the goal of improving safety and service life Effect

Active Publication Date: 2016-01-20
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the battery has faults such as short circuit, overvoltage, overcurrent, overheating, etc., the battery cannot drive the three-phase motor to rotate, and the three-phase motor may be driven by the wheels at a high speed. High (the battery is connected to the three-phase motor through the three-phase bridge inverter), and the battery is damaged by overvoltage

Method used

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  • Active short-circuit protection circuit of electric automobile
  • Active short-circuit protection circuit of electric automobile
  • Active short-circuit protection circuit of electric automobile

Examples

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Embodiment 1

[0037] An embodiment of the present invention provides an active short-circuit protection circuit for an electric vehicle. As mentioned above, the electric vehicle includes a three-phase bridge inverter, and the three-phase bridge inverter includes three bridge arms connected in parallel, each The bridge arm consists of two power switching devices connected in series, see figure 2 , the active short-circuit protection circuit consists of:

[0038] The control module 101 is used to generate a driving signal for controlling the on-off of the six power switching devices, a driving enabling signal for controlling the simultaneous disconnection of the six power switching devices, and a short-circuit enabling signal for controlling whether to perform active circuit protection;

[0039]The logic circuit 102 is used to control the six power switching devices to turn off when the driving enable signal is at the first level; when the driving enabling signal is at the second level, the ...

Embodiment 2

[0043] An embodiment of the present invention provides an active short-circuit protection circuit for an electric vehicle. This embodiment is a specific introduction to the active short-circuit protection circuit for an electric vehicle provided in Embodiment 1. As mentioned above, the electric vehicle includes a three-phase bridge inverter Inverter, the three-phase bridge inverter includes three bridge arms connected in parallel, and each bridge arm includes two power switching devices connected in series, see image 3 , the active short-circuit protection circuit consists of:

[0044] The control module 201 is used to generate a driving signal for controlling the on-off of the six power switching devices, a driving enabling signal for controlling the simultaneous disconnection of the six power switching devices, and a short-circuit enabling signal for controlling whether to perform active circuit protection;

[0045] The logic circuit 202 is used to control the six power swi...

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PUM

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Abstract

The invention discloses an active short-circuit protection circuit of an electric automobile, and belongs to the technical field of electric automobiles. The active short-circuit protection circuit comprises a control module and a logic circuit, wherein the control module is used for generating driving signals, a drive enable signal and a short-circuit enable signal; the logic circuit is used for controlling six power switching devices to be all disconnected when the drive enable signal is first level, controlling on-off of two series connected power switching devices when the drive enable signal is second level, the short-circuit enable signal is the first level and at least one of the driving signals controlling on-off of the series connected power switching devices is the first level, and controlling three power switching devices, whose first electrodes are mutually connected, to be conducted and controlling three power switching devices, whose second electrodes are mutually connected, to be disconnected when both the drive enable signal and the short-circuit enable signal are the second level. The active short-circuit protection circuit disclosed by the invention improves the safety and the service life of the electric automobile.

Description

Technical field [0001] The invention relates to the technical field of electric vehicles, and in particular to an active short-circuit protection circuit for electric vehicles. Background technique [0002] The increasing shortage of global oil resources and the increasingly serious environmental pollution have promoted the development of energy-saving and environmentally friendly electric vehicles such as hybrid vehicles and pure electric vehicles. [0003] An electric vehicle consists of a battery, a three-phase bridge inverter and a three-phase motor connected in sequence. The battery drives the three-phase motor to rotate through the three-phase bridge inverter, which in turn drives the wheels to rotate, realizing the movement of the electric vehicle. [0004] In the process of realizing the present invention, the inventor found that the existing technology has at least the following problems: [0005] When the battery fails such as short circuit, overvoltage, overcurr...

Claims

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Application Information

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IPC IPC(8): H02H7/18B60L3/00
CPCY02T10/72
Inventor 凌欢罗晓陈茜兵杭孟荀邵平袁文爽
Owner 奇瑞新能源汽车股份有限公司