Hybrid power switching device

Details Hybrid power switching device Hybrid power switching device

1997-03-26

1998-08-04

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, H02H 300

Patent

active

057903549

ABSTRACT:
A hybrid power switching device for eliminating mechanical relay arcing. The device reduces mechanical relay contact damage due to arcing and substantially reduces power dissipation by placing a solid state relay in parallel with a mechanical relay. The solid state relay is preferably a semiconductor triac optically coupled to a light emitting diode. The device takes advantage of the inherent lag time (operating time) when a mechanical relay contact switch closes. The device uses only analog components and controls the triac by means of a Schmitt trigger pulse stretcher. The advantages to the present Schmitt trigger include discrete turn off and a narrow hysteresis. A low level control voltage signal operates the mechanical relay and the Schmitt trigger, or optionally a high level control voltage signal in conjunction with a signal inverter.

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patent: 5283706 (1994-02-01), Lillemo et al.
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