Switching device

Details Switching device Switching device

1996-01-02

1997-03-18

Martin, David S.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307125, 307139, 307141, 327143, 327261, 327381, 363 74, 323234, H01H 700

Patent

active

056125828

ABSTRACT:
The present invention provides a switching device incorporating a simple circuit capable of avoiding the flash-on of a transistor when a power supply is turned on and off thereby reducing the OFF delay time. The output circuit comprises a FET (145) having a drain and a source connected in series to a current line for supplying a current from a power supply (VD) to an output detector (load) (L), and a photocoupler (149) for applying a driving voltage across the gate and the source of the FET (145) according to the output of an internal circuit (151), a differentiation circuit comprising a capacitor (7) and resistors (5,9) is connected across the drain and the source of the FET (145), and second transistor (3) having a collector and an emitter connected to the gate and the soruce of the FET (145) is driven by a charging current for charging the capacitor (7). When a voltage applied across the drain and the source of the FET (145) starts rising, the second transistor (3) is turned on to turn off the FET (145) forcibly.

REFERENCES:
patent: 4041334 (1977-08-01), Umeda
patent: 4307440 (1981-12-01), Inoue et al.
patent: 5184031 (1993-02-01), Hayakawa et al.
patent: 5204562 (1993-04-01), Pace
patent: 5469094 (1995-11-01), Nessi

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