High power electronic ballast with an integrated magnetic component
 A high power electronic ballast for operating one or more discharge lamps includes a power factor correction high frequency converter input stage in cascade with an output stage made up of a half-bridge resonant converter. In place of the conventional isolation transformer in the output stage, the input stage utilizes a single integrated transformer inductor magnetic component, thereby eliminating the usual output stage isolation transformer. The input stage is operated in a critical conduction mode which further improves the electronic ballast. 
Philips Electronics North America Corporation
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Y02B H05B H05B H05B
additional inventional inventional inventional
Chin Adan F.
Chang Hernandez