Photocoupler sensing circuit and operation method thereof

Abstract

The invention provides a photocoupler sensing circuit and an operation method thereof. The photocoupler sensing circuit includes a processing circuit and a sensing circuit. The processing circuit has a first input terminal and a second input terminal. The processing circuit outputs a first signal according to a connection status of the first input terminal and the second input terminal being short or open. The sensing circuit is coupled to the processing circuit and receives the first signal. The sensing circuit determines to output a sensing signal to a system terminal according to the first signal, so that the system terminal determines whether the connection status of the first input terminal and the second input terminal is short or open according to the sensing signal. The sensing circuit includes a single-diode photocoupler coupled to the system terminal.

Dependencies are inferred from the claim text.