Safety protection circuit of blade electric vehicle motor

A safety protection circuit, pure electric vehicle technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of lack of vehicle safety, inability to guarantee motor misoperation, etc., to achieve the effect of reliable and reliable protection of the circuit

CN105591362AInactive Publication Date: 2016-05-18HEFEI JUYI POWER SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-05-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a safety protection circuit of a blade electric vehicle motor. The safety protection circuit is characterized in that a pulse signal rectification filter circuit is used to receive pulse signals output by a microcontroller MCU of a motor controller, and the output end of the pulse signal rectification filter circuit is connected with an input end of a voltage comparison circuit; the output end of the voltage comparison circuit is connected with an input end of a multi-signal logical operation circuit, and the output end of the multi-signal logical operation circuit is connected with an input end of a fault latch and reset circuit; the output end of the fault latch and reset circuit is connected with an input end of a high voltage isolation circuit, and the output end of the high voltage isolation circuit is connected with a control end of a relay of a relay control circuit; three-phase driving signals U,V,W of the motor controller are connected with a three-phase line of a motor M by a relay normally-closed end, and a relay normally-opened end is connected with high voltage ground by a power resistor. The safety protection circuit of the blade electric vehicle motor is advantageous in that the fault monitoring function and the safety protection function are integrated into one body, and therefore the safety protection of the motor and the vehicle can be realized quickly, safely, and reliably.
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Description

technical field

[0001] The invention relates to the technical field of automatic control of electric vehicles, in particular to a safety protection circuit for pure electric vehicle motors. Background technique

[0002] Pure electric vehicles are generally driven by high-voltage motors. If the motor controller fails, the output torque of the motor will be too small or too large, the speed of the motor will be uncontrollable, or the high voltage of the drive will leak. Any of the above phenomena is beyond the control of the vehicle driver. Once it occurs, it will damage the vehicle, affect the safe driving of the vehicle, and seriously endanger the personal safety of the driver.

[0003] At present, the measures adopted mainly focus on the monitoring of the three-phase current of the motor, mainly current phase loss detection, current peak detection, etc., and the measures taken are to turn off the motor drive signal. If the drive circuit also fails when the current fault ...

Examples

Embodiment Construction

[0012] Such as figure 1 As shown, a safety protection circuit for a pure electric vehicle motor includes a pulse signal rectification and filtering circuit 1 for receiving a pulse signal output by a microcontroller MCU in a motor controller, and its output terminal is connected to the input terminal of a voltage comparison circuit. The output end of the voltage comparison circuit is connected with the input end of the multi-signal logic operation circuit 2, the output end of the multi-signal logic operation circuit 2 is connected with the input end of the fault latch and reset circuit 3, and the output end of the fault latch and reset circuit 3 It is connected to the input end of the high-voltage isolation circuit 4, the output end of the high-voltage isolation circuit 4 is connected to the control end of the relay in the relay control circuit 5, and the three-phase drive signals U, V, W of the motor controller pass through the normally closed end of the relay It is connected ...