EXCESS CURRENT PROTECTION CIRCUIT OF INVERTER WASHING MACHINE

摘要

PURPOSE: An excess current protection circuit of inverter washing machine is provided which detects the voltage that noise is decreased by an intelligent power module(IPM) and to make operated stably the circuit by connecting a voltage follower with an integral circuit which consists of a resistor and a condenser. CONSTITUTION: When the washing machine is operated, current passed a P-terminal and an IPM(100) flows into an N-terminal and the current passes through shunt resistor(R1). The voltage(R1) deserted in the shunt resistor is influenced greatly by a noise during the voltage(R1) passes a voltage(R2), but the noise is gone down during the voltage(R1) passes the voltage follower(IC1), subsequently, the voltage reduced the noise is inputted into a Cin terminal. Therefore, in the IPM(100), based on the A point voltage deserted in the shunt resistor(R1), if more voltage than the reference voltage admit, the circuit detect as excess current to intercept power inputting.