H-Switch having short to plus protection

Details H-Switch having short to plus protection H-Switch having short to plus protection

1981-02-23

1982-06-22

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 91, 361 98, 318257, 318294, H02H 320

Patent

active

043365620

ABSTRACT:
An H-switch driver circuit includes two pairs of opposed drive transistors each pair being selectively energized to control the polarity of power applied to a load. Each pair of transistors is energized by a power current mirror that includes an NPN transistor that supplies base drive current to the remaining transistors in the power current mirror. The emitter of the NPN transistor is coupled to the load. The NPN transistor is biased off to inhibit base drive current to the circuit transistors in the event of a short to plus fault at one of the load terminals.

REFERENCES:
patent: 3110851 (1963-11-01), Plogstedt et al.
patent: 3846684 (1974-11-01), Jossic
patent: 4017765 (1977-04-01), Maisch

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