H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/37, 315/55
H05B 41/24 (2006.01) H05B 41/298 (2006.01)
Patent
CA 1333408
An electronic ballast circuit for fluorescent or other gaseous discharge lamps includes a resonant half-bridge inverter circuit. The source voltage to the inverter is a full-wave rectified line voltage together with a DC carry-over voltage for supplying power in the inter-cusp period of the rectified line voltage. A negative feedback circuit is responsive to lamp current to vary the inverter drive frequency and thereby regulate lamp current. The frequency response of the feedback loop is high enough and the gain-versus-frequency response of the inverter is such that lamp current and voltage are regulated to reduce the crest factor of lamp current to compensate for variation in the amplitude of the voltage across the semiconductor switches.
491598
Advance Transformer Co. A. Division Of Philips Electronics North America Corporation
Osler Hoskin & Harcourt Llp
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