CIRCUIT OF SHUTTING OFF POWER SUPPLY CONTROL SIGNAL

摘要

Disclosed is a signal blocking circuit for blocking a power control signal inputted to the driving circuit of a power switching device. The present invention provides a circuit of blocking a power control signal which includes a fault level detection part which detects the signal level of a fault signal inputted from the driving circuit; a fault edge detection part which detects an edge change when the condition of the fault signal is changed; and a blocking part which blocks a power control signal inputted to the driving circuit when at least one of an output signal from the fault level detection circuit and an output signal from the fault edge detection circuit command the abnormal operation of the power switch device.