Research and Implementation of Insulation Detection Technology for DC Microgrid of Electric Vehicle

Aiming at the high voltage safety application of 270 V direct-current (DC) microgrid for electric vehicles, this paper designs an auxiliary power supply method for real-time detection of insulation resistance. The method realizes insulation detection by controlling the internal relay to switch between positive and negative bus bars and uploading the insulation status in real time through the controller area network (CAN) bus. Through practical engineering applications, this method can detect the insulation resistance of the microgrid in real time, and its detection accuracy meets the safety requirements of the system, thereby providing strong support for the safety application of the high voltage DC microgrid.