Safety protection circuit of blade electric vehicle motor

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.

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 ...

AI Technical Summary

Problems solved by technology

If the drive circuit also fails when the current fault is detected, or the current fault is caused by the drive fault, this method will not be effective, because turning off the drive signal can only ensure that the motor is not controlled by the control system, and cannot guarantee that other fault signals will affect the motor. Misoperation, and this method lacks the consideration of vehicle safety. From a safety point of view, when a fault occurs, the first time should not be to shield or find the source of the fault, but to ensure safety, and then to shield or find the source of the fault. Moreover, in order to ensure the effective execution of safety actions, functional units and safety units should be independent to prevent common cause failures

Images