Method for controlling a power supply switch and circuit arrange

Details Method for controlling a power supply switch and circuit arrange Method for controlling a power supply switch and circuit arrange

1997-09-24

1999-10-26

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

323282, 361 93, 363 74, H01H 4700

Patent

active

059734167

ABSTRACT:
The power supply to a load in a power supply circuit is controlled by a power supply switch which in turn is controlled by a control circuit and by a feedback signal representing a voltage drop across the load. The control circuit provides at its output a high level signal, a low level signal, and a high impedance signal level, whereby the high signal level initially closes the power supply switch, and the feedback signal normally keeps the power supply switch in its closed "ON-state" as long as said high impedance level prevails. The switch is caused to open and assume its "OFF-state" in response to a circuit fault as signified by said feedback signal or in response to said low level signal. A monitor detects the "ON" or "OFF" state of the switch under normal operating conditions and also the "OFF" state when a circuit fault such as a short occurred in the power supply circuit. The monitor further detects in the "OFF" state of the switch whether the load is connected to the power supply circuit or whether the power supply circuit is interrupted.

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U. Tietze et al., Halbleiter-Schaltungstechnik, Springer Verlag, 1993, p. 209.
G. De Michele, "Protect Driver From Overload" Electronic Design, Sep. 19, 1994, pp. 136, 138, 140.

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