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Zero energy-storage ballast for compact fluorescent lamps

United States Patent

5,945,783
August 31, 1999
View the Complete Patent at the US Patent & Trademark Office
A CFL ballast includes complementary-type switching devices connected in series with their gates connected together at a control node. The switching devices supply a resonant tank circuit which is tuned to a frequency near, but slightly lower than, the resonant frequency of a resonant control circuit. As a result, the tank circuit restarts oscillations immediately following each zero crossing of the bus voltage. Such rapid restarts avoid undesirable flickering while maintaining the operational advantages and high efficacy of the CFL ballast.
Schultz; William Newell (Niskayuna, NY), Thomas; Robert James (Rexford, NY)
General Electric Company (Schenectady, NY)
09/ 114,617
July 13, 1998
The U.S. government has rights in this invention pursuant to Contract No. DE-FC36-97GO10236 awarded by the Department of Energy.