Low -tension motor protection device protective current input circuit

The utility model provides a low -tension motor protection device protective current input circuit, includes current transformer, current transformer's input and low -tension motor arrival current are connected, resistive?voltage?divider circuit one end with the current transformer output is connected, and the other end is connected with the voltage follower input, voltage follower output and DC?bias voltage and the input of opposition summation arithmetic circuit is connected, and the input and the output of opposition summation arithmetic circuit of opposition proportion arithmetic circuit are connected, and the output is connected with the input of resistance -capacitance low pass filter circuit, and the output and microcontroller internal die / number translation unit's the input of resistance -capacitance low pass filter circuit are connected. This circuit has improved the conversion accuracy and the conversion rate of motor protection protection current sample signal. 种低压电动机保护装置保护电流输入电路，包括电流互感器，电流互感器的输入