Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1996-04-22
1998-04-07
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307 38, 307 39, 307 52, 307125, 361 13, 361 60, H03K 5153
Patent
active
057367957
ABSTRACT:
A solid state power switching circuit for alternating current loads, in which operating power for the circuit is diverted from the switched current during power stealing intervals self-synchronized with the alternating current waveform. During periods in which current to the load is commanded, a load current switch is maintained in a low impedance state except for the duration of a short power stealing interval each half-cycle of the supplied alternating current. Self-synchronization is achieved with a current detector which senses whether or not the magnitude of the current diverted during each power stealing interval exceeds a current threshold, and pulse generator logic which shifts the power stealing intervals in time relative to the alternating current waveform in response to the previously sensed current magnitude.
REFERENCES:
patent: 4039867 (1977-08-01), Blumberg et al.
patent: 4210830 (1980-07-01), Fukahori
patent: 5218235 (1993-06-01), Patterson et al.
patent: 5523547 (1996-06-01), Miller
patent: 5604424 (1997-02-01), Shuttleworth
Lein Steven H.
Zuehlke Kurt G.
Honeywell Inc.
Paladini Albert W.
Rubow Charles L.
Shoop Jr. William M.
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