Two wire low voltage dimmer

Details Two wire low voltage dimmer Two wire low voltage dimmer

1989-05-26

1990-09-04

Beha, Jr., William H.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

307632, 307645, 315DIG4, 323324, 323326, 323905, G05F 502

Patent

active

049547682

ABSTRACT:
A low voltage two wire dimming circuit comprises a voltage compensating circuit for regulating the RMS value of an AC voltage applied to a load and a correcting circuit for eliminating damaging DC current that may flow through the load. The voltage compensating circuit adjusts the firing angle of an electronic switch disposed in the dimming circuit to compensate for fluctuations in the AC supply voltage. The correcting circuit advances or retards the firing angle during selected half cycles to correct for asymmetries in the AC load voltage waveform caused by excessive DC current. According to the invention, there is also provided a two wire low voltage dimming circuit without voltage compensation but having improved dimming ability at low load currents and improved resistance to the flow of damaging DC currents.

REFERENCES:
patent: 3436562 (1969-04-01), Harris
patent: 3484623 (1969-12-01), Cain
patent: 3515902 (1970-06-01), Howell
patent: 3526790 (1970-09-01), Brookmire
patent: 3594591 (1971-07-01), Laupman
patent: 3609517 (1971-09-01), Tucker
patent: 3872374 (1975-03-01), Rasmussen
patent: 4703248 (1987-10-01), Kuhnemundt et al.

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