Study on Residual Current Protector for Electric Vehicle Charging Pile

A residual current protector suitable for electric vehicle charging mode 2 is introduced in this paper, which can detect the sinusoidal AC, pulsating DC, smooth DC and other residual current waveforms generated during electric vehicle charging. The magnetic modulated current transformer in the protector is used to detect the complex residual current, the low pass analog filter is used to demodulate the signal, and the residual current is collected and analyzed by the MCU. Through the test, the protector meets the leakage protection requirements of IEC62752 《In-Cable Control and Protection Device for mode 2 charging of electric road vehicles, IC-CPD》. Furthermore, the protector characterizes a simple structure, small size and low cost.