H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/38 (2006.01) H05B 37/02 (2006.01) H05B 41/16 (2006.01)
Patent
CA 2537532
An apparatus and method for powering a lamp connected to a ballast circuit. The ballast circuit is connected to a first alternating current (AC) source having a first phase and to a second AC source having a second phase. A first rectifier circuit is connected between the first AC source and a first switching circuit. A second rectifier circuit is connected between the second AC source and a first switching circuit. A control circuit selectively energizes the first and second switching circuits to provide power from the first and second AC sources to the lamp load via an inverter circuit. A detection circuit generates a detection signal indicating whether power is being supplied by each the first and second AC sources. The detection signal is provided to a dimming regulation circuit to generate a dim level command signal for dimming the lamp.
Choudhury Ayan Kumar
Ravindra Thotakura Venkata
Osram Sylvania Inc.
Smart & Biggar
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