An active short-circuit protection circuit for an electric vehicle electric drive system

An electric drive system, active short-circuit technology, applied in the direction of electric vehicles, circuits or fluid pipelines, electrical devices, etc., to achieve the effect of protection from damage

Active Publication Date: 2016-09-14
HEFEI JUYI POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there are no published reports on active short-circuit protection circuits for electric vehicle electric drive systems

Method used

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  • An active short-circuit protection circuit for an electric vehicle electric drive system

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Embodiment Construction

[0011] An active short circuit protection circuit for an electric drive system of an electric vehicle includes an exclusive OR circuit 1 for receiving two hardware trigger signals output by a hardware circuit. The output terminal of the exclusive OR circuit 1 is connected to the second input terminal of the trigger circuit 2 , The first input terminal of the trigger circuit 2 receives the main control chip trigger signal output by the main control chip of the electric drive system, the output terminal of the trigger circuit 2 is connected to the input terminal of the logic inversion circuit 3, and the output terminals of the logic inversion circuit 3 are respectively It is connected to the input end of the three bridges on the motor driver and the delay logic inversion circuit 4, and the output end of the delay logic inversion circuit 4 is connected to the lower three bridges of the motor driver. The exclusive OR circuit 1 is used to detect whether the system meets the condition...

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Abstract

The invention relates to an active short-circuit protection circuit for an electric drive system of an electric automobile. The active short-circuit protection circuit comprises an exclusive-or circuit for receiving two paths of hardware trigger signals outputted by a main control chip of the electric drive system, wherein the output end of the exclusive or circuit is connected with the second input end of a trigger circuit, the first input end of the trigger circuit is used for receiving a main control chip trigger signal outputted by the main control chip of the electric drive system, the output end of the trigger circuit is connected with the input end of a logical reverse rotation circuit, the output end of the logical reverse rotation circuit is respectively connected with the input ends of a motor driver upper tridrive and a time delay logical reverse rotation circuit, and the output end of time delay logical reverse rotation circuit is connected with a motor driver lower tridrive. According to the active short-circuit protection circuit, the running state of the electric drive system is monitored in real time, a three-phase winding of a motor in the electric drive system can be short-circuited when the system fails and stops working, a drive motor is locked, power generating current is prevented from flowing into a power battery backwards, and the power battery is protected from damage.

Description

Technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an active short circuit protection circuit for an electric drive system of an electric vehicle. Background technique [0002] In the driving process of an electric vehicle, if the electric drive system stops working due to a fault, the drive motor in the system will naturally switch from an electric state to a generating state, and charge the electric vehicle power battery, which may cause the power battery to overcharge and cause power The battery fails, and even causes the power battery to overvoltage and catch fire, causing major hidden dangers to driving safety. Therefore, this phenomenon must be protected in real time. Once such a failure occurs, the charging circuit should be cut off immediately to protect the safety of the power battery of electric vehicles. However, so far there is no public report on the active short circuit protection circuit of the electric drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/00B60R16/02
CPCY02T10/72
Inventor 王淑旺苑红伟孙纯哲徐义郭行
Owner HEFEI JUYI POWER SYST CO LTD
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