The embodiment of the invention provides a vehicle and an insulation monitoring circuit for a vehicle battery. The insulation monitoring circuit obtains power supply from the vehicle battery and comprises a voltage-frequency conversion circuit, an RC series circuit, a first peak value sampling circuit and an alarm triggering module. The voltage-frequency conversion circuit outputs a low-frequency pulse signal and injects the low-frequency pulse signal into a high-voltage system connected with a vehicle battery through the RC series circuit; the first peak value sampling circuit is used for sampling a voltage signal at the rear end of a resistor in the RC series circuit and feeding back the voltage signal to the voltage-frequency conversion circuit, so that an output low-frequency pulse signal adapts to a vehicle battery; and the alarm trigger module processes a voltage signal at the rear end of the resistor in the RC series circuit and outputs an alarm trigger signal. The whole insulation monitoring process can not be controlled by a BMS of the vehicle, real-time insulation monitoring can be carried out as long as the vehicle battery is complete, meanwhile, the low-frequency pulse signals are output through a closed loop, self-adaption to capacitance between a high-voltage loop and a low-voltage loop of the vehicle battery can be achieved, and therefore stable and reliable insulation monitoring can be achieved.
本申请实施例提供了一种车辆和用于车辆电池的绝缘监测电路,其从车辆电池获得供电并且包括压频转换电路、RC串联电路、第一峰值采样电路、报警触发模块;压频转换电路输出低频脉冲信号并经由RC串联电路注入车辆电池连接的高压系统;第一峰值采样电路对RC串联电路中电阻后端的电压信号进行采样并反馈至压频转换电路,以使输出的低频脉冲信号与车辆电池相适应;报警触发模块对RC串联电路中电阻后端的电压信号进行处理,输出报警触发信号。整个绝缘监测过程可以不受车辆的BMS控制,只要车辆电池完整即可进行实时绝缘监测,同时采用闭环输出低频脉冲信号,能够自适应车辆电池高低压回路间的电容,从而可以实现稳定、可靠的绝缘监测。
Vehicle and insulation monitoring circuit for vehicle battery
车辆和用于车辆电池的绝缘监测电路
2022-03-15
Patent
Elektronische Ressource
Chinesisch
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