Design of high voltage circuit safety monitoring system for pure electric vehicles

ZHANG Jun， XIE Wei-dong
（The MOE key Laboratory of Vehicle Engineering， Zhejiang University of Technology， Hangzhou 310014， China）

Abstract： Aiming at realizing high voltage safety circuit monitoring of the pure electric vehicle，insulation monitoring，pre-charging，high & low voltage protection and high voltage interlocking of the high voltage circuit were researched，and the monitoring system based on STM32 ARM Cotex-M3 and CAN bus technology was proposed. The insulation resistance and the failure cut response time of high voltage system were tested by using high voltage DC test rig. The results indicate that the system can real-timely monitor the electrical parameters of the high-voltage，realize the function of insulation monitoring，pre-charging，high & low voltage protection and high voltage interlocking，and it has fast response and high reliability.
Key words： pure electric vehicles； high voltage safety； monitoring； STM32