Patent ID: 7550928

Claim:
A driving circuit for driving a light source comprising: a transformer comprising a plurality of primary windings and a plurality of secondary windings, wherein said plurality of primary windings are coupled to a power source and comprise a first set of primary windings coupled in series and a second set of primary windings coupled in series, and wherein said light source is coupled between a positive polarity of a first secondary winding and a negative polarity of a second secondary winding; a first switch for conducting current through a first path comprising said first set of primary windings; a second switch for conducting current through a second path comprising said second set of primary windings, wherein said first switch and said second switch are enabled alternately to drive said light source; and feedback circuitry coupled to a negative polarity of said first secondary winding and to a positive polarity of said second secondary winding, said feedback circuitry providing signals indicating conditions at said light source and useful for adjusting said power source accordingly.