Switch device
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsKeisuke Wakazono, Yuuki Sugisawa
Life of this patent
Estimating the term…
Abstract
In a semiconductor switch, 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 is disposed on a path extending from the current input terminal to the control terminal. The booster circuit boosts a voltage input from the current input terminal side and applies the boosted voltage to the control terminal. A switch is connected between the control terminal and the current output terminal of the semiconductor switch. The switch is switched off by power consumption. The power consumption stops and the switch switches on if the supply of power to the booster circuit stops.
Claims9
A switch device for controlling the flow of power from a battery to a load, the switch device comprising:
- a semiconductor switch having a resistance value between a current input terminal to which a current from the battery is input and a current output terminal from which a current is output to the load, the resistance value decreases as a voltage of a control terminal increases, the voltage of the control terminal being based on a potential of the current output terminal;
- a first switch that is switched off by a power consumption of the current input terminal and that switches on if the power consumption of the current input terminal stops, the first switch is connected between the control terminal and the current output terminal;
- and
- a first connection terminal detachably connected to a second connection terminal, the second connection terminal connected to a ground conductor, wherein the switch device is configured to stop power from the battery to the load when the first connection terminal is disconnected from the second connection terminal.
A circuit for providing power from a battery to a load, the circuit comprising:
- a semiconductor switch in which a resistance value between a current input terminal to which a current from the battery is input and a current output terminal from which a current is output to the load decreases as a voltage of a control terminal based on a potential of the current output terminal increases;
- a booster circuit that boosts a voltage input to the control terminal;
- a first connection terminal detachably connected to a second connection terminal, the second connection terminal connected to a ground conductor;
- a first switch disposed between the current input terminal and the booster circuit, the first switch configured to keep the semiconductor switch on when the first switch is turned on and to turn off the semiconductor switch when the first switch is turned off;
- and
- a switching circuit interposed between a positive terminal of the battery and the first connection terminal, the switching circuit configured to turn on and off the first switch;
- the switching circuit is configured to turn off the first switch when the first connection terminal is disconnected from the second connection terminal.
Dependencies are inferred from the claim text.