CONTROL DEVICE FOR SEMICONDUCTOR SWITCH, AND ELECTRICAL POWER SYSTEM

In a control device that drives a semiconductor switch element, a first control switch is connected between a signal line and a source terminal or an emitter terminal of a semiconductor switch element. The signal line supplies a driving signal to a gate terminal or a base terminal of semiconductor switch element. The first control switch is controlled to an ON state when the semiconductor switch element is controlled to an OFF state. A second control switch is connected between the signal line and the source terminal or the emitter terminal in parallel with the first control switch. The second control switch is turned on when a potential of the source terminal or the emitter terminal becomes a negative potential.