Electricity: power supply or regulation systems – Input level responsive – Phase controlled switching using electronic tube or a three...
Patent
1987-11-17
1989-10-24
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, 323326, 323905, G05F 502
Patent
active
048764981
ABSTRACT:
A low voltage two wire dimming circuit comprises voltage compensating means for regulating the RMS value of an AC voltage applied to a load and correcting means for eliminating damaging DC current that may flow through the load. The voltage compensating means adjusts the firing angle of electronic switch means disposed in the dimming circuit to compensate for fluctuations in the AC supply voltage. The correcting means 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 compensating means but having improved dimming ability at low load currents and improved resistance to the flow of damaging DC currents.
REFERENCES:
patent: 3346874 (1967-10-01), Howell
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
Der Electrotromeister & Deutsches Elektrohandwerk, vol. 48, 1973, Issue 19, pp. 1403-1405.
Funkt-Technik, 1972, No. 20, pp. 741-743 and 746.
Elektronik, 1968, Issue 4, pp. 105-110.
Houng Charles C.
Luchaco David G.
Beha Jr. William H.
Lutron Electronics Co. Inc.
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