Power circuit including means for automatically protecting a cho

Details Power circuit including means for automatically protecting a cho Power circuit including means for automatically protecting a cho

1980-01-17

1982-10-19

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

318341, 361101, H02H 320

Patent

active

043553427

ABSTRACT:
A chopping transistor connected across a d-c power supply, in series with a load such as a motor, has its base connected to an output of an oscillator generating a train of voltage pulses V.sub.1 by which that transistor is alternately turned on and off. A threshold sensor emits a series of monitoring pulses V.sub.2 of the same polarity as the conduction-establishing control pulses V.sub.1 when the collector/emitter voltage of the transistor surpasses a certain limit; the joint appearance of signals V.sub.1 and V.sub.2 at respective inputs of an AND gate gives rise to an off-normal signal V.sub.3 which, if of extended duration, passes a delay circuit to act as an alarm signal V.sub.4. A memory tripped by that alarm signal emits a permanent disconnect signal V.sub.5 which either blocks the oscillator or fires a thyristor in shunt with the transistor whereby a fuse in series therewith is blown. The transistor may be one of four such transistors inserted in respective arms of a bridge, with two oscillators each driving a pair of these transistors and a common fuse in series with both pairs.

REFERENCES:
patent: 3493815 (1970-02-01), Hurtle
patent: 4006370 (1977-02-01), Erler
patent: 4126889 (1978-11-01), Ibamoto et al.
patent: 4217526 (1980-08-01), Farr

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