PC switch circuit with discharge circuitry

摘要

Provided is a relatively simple PC switch circuit which performs a function for removing the residual voltage with a high reliability. The switch circuit includes a first switch 101 having a first terminal connected to the first power source, a second terminal connected to the load component and a control terminal to which a first control signal for controlling the first switch is supplied; a second switch 103 having a first terminal connected to the control terminal of the first switch, a second terminal connected to the second power source and a control terminal to which a second control signal for controlling the second switch is supplied; and a reverse current preventing element 107 connected between the load component and the first terminal of the second switch. A fault condition of the second switch is easily detected, and a flow of a wasteful current from the second terminal of the first switch to the second power source is prevented. This circuit is ideally suited for use in personal computer technology.