Vehicle and insulation monitoring circuit for vehicle battery

Abstract

A vehicle and an insulation monitoring circuit for vehicle battery, the insulation monitoring circuit acquiring power from the vehicle battery and comprising a voltage-to-frequency conversion circuit (), an RC series circuit (), a first peak sampling circuit (), and an alarm trigger module (); the voltage-to-frequency conversion circuit () outputs a low-frequency pulse signal and injects same via the RC series circuit () into a high-voltage system connected to the vehicle battery; the first peak sampling circuit () performs sampling on a voltage signal of a resistor rear end in the RC series circuit () and feeds back same to the voltage-to-frequency conversion circuit (), such that the outputted low-frequency pulse signal is adapted to the vehicle battery; and the alarm trigger module () performs processing on the voltage signal of the resistor rear end in the RC series circuit () and outputs an alarm trigger signal. The entire insulation monitoring process can be implemented without the control of the vehicle BMS, and real-time insulation monitoring can be implemented as long as the vehicle battery is intact; in addition, the use of a closed-loop output low-frequency pulse signal enables adaption to the capacitance between the high and low voltage circuits of the vehicle battery, thereby achieving stable and reliable insulation monitoring.