CIRCUIT AND METHOD FOR SENSING OVER CURRENT USING TRANSMISSION OF OPTIC SIGNAL

摘要

PURPOSE: A circuit for sensing an over-current and a method thereof are provided to improve the stability of an electronic device by safely sensing an over-current flowing in a high voltage line more than 20kV. CONSTITUTION: An over-current sensing circuit comprises an optical signal generator(100) and an output part(200). The optical signal generator generates an optical signal by detecting an over current flowing in a current line of an electronic device. The optical signal generator comprises a current sense resistor(Rs) and an optical signal transmission module(Q1). The current sense resistor is arranged in the current line. The optical signal transmission module is turned on in order to transmit an optical signal when a voltage applied to the current sense resistor is greater than an operation threshold voltage. An output part generates an output due to a power current after receiving the optical signal.