Electrical dimmer system employing alternately applied silicon c

Details Electrical dimmer system employing alternately applied silicon c Electrical dimmer system employing alternately applied silicon c

1992-09-30

1994-07-05

Mullins, James B.

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315307, 315324, 323223, 323324, 323327, 323905, G05F 100

Patent

active

053270479

ABSTRACT:
A dimmer control system includes two discrete silicon controlled rectifiers which respectively energize a lamp load during alternate half cycles of the input AC voltage. The separate placement of the SCRs ensures that much lower temperatures are reached than would occur if a single triac were used to energize a lamp during both half cycles. The system also includes a pair of diacs which energize the respective SCRs when a respective capacitor directly connected to each diac discharges through one of them. The system further includes a respective capacitor charging circuit for each capacitor, each of the two charge circuits including a series connections of the gate to cathode junction of the SCR other than the one which the capacitor being charged discharges through, a diode, a common fixed resistor, and a common variable resistor.

REFERENCES:
patent: 3401265 (1964-07-01), Dotto
patent: 3517259 (1970-06-01), Dotto
H. M. Newsom, circuits to adjust current to match requirements of load, Nov. 1966.

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