Switching device

Details Switching device Switching device

1987-03-16

1988-07-19

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Using a three or more terminal semiconductive device as the...

323284, 323317, G05F 500

Patent

active

047587733

ABSTRACT:
A switching device is constituted by two transistors having different emitter areas, a resistor connected to a transistor having a larger emitter area, a driving transistor having a control electrode connected to the collector of the transistor having a smaller emitter area, and a constant-current circuit connected to the two transistors so as to supply equal currents to the two transistors. The bases of the two transistors are equally biased to a constant level. An input current is supplied to the switching device through an input terminal and is divided into the emitter currents of the two transistors. The relative largeness of the collector currents of the two transistors are reversed when the input current exceeds the threshold, thereby to cause the potential change at the collector of the transistor having a smaller emitter area to operate the driving transistor and to control the current supply to the load.

REFERENCES:
patent: 3898552 (1975-08-01), Baker
patent: 3899718 (1975-08-01), Schafe
patent: 3916220 (1975-10-01), Roveti
patent: 4253055 (1981-02-01), Gatten
patent: 4458201 (1984-07-01), Koen

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