Patent ID: 11901887
Assignee: AUTONETWORKS TECHNOLOGIES, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switch device comprising:
a semiconductor switch in which a resistance value between a current input terminal to which a current is input and a current output terminal from which a current is output decreases as a voltage of a control terminal based on a potential of the current output terminal increases;
a booster circuit that is disposed on a path extending from the current input terminal to the control terminal, and that boosts a voltage input from a side of the current input terminal and applies the boosted voltage to the control terminal;
a first switch that is connected between the current input terminal and the booster circuit and that switches off if the supply of power to the booster circuit stops; and
a second switch that is switched off by receiving a power supply and that switches on when the power supply stops,
wherein the second switch is connected between the control terminal and the current output terminal, and
the power supply stops when the supply of power to the booster circuit stops.