Failure detection circuit and failure detection device

Abstract

The present invention discloses a failure detection circuit and failure detection device. The fault detection device includes a switching circuit, a bias control circuit, and a fault detection circuit. The switching circuit has a first terminal, a second terminal, and a control terminal. The switching circuit connects or disconnects the first and second terminals according to a control terminal voltage. The bias control circuit is coupled to the switching circuit and changes the control terminal voltage according to a fault signal. The fault detection circuit is coupled to the bias control circuit, detects the AC component of the control terminal voltage, and generates a fault signal according to the AC component of the control terminal voltage. The fault detection circuit receives a detection signal, compares the detection signal, and generates a detection result signal. When the detection result signal is a fixed level signal or non-ripple signal, the fault detection circuit generates a fault signal.

Images