Patent ID: 7271548

Claim:
A multi-lamp driver for driving a first lamp and a second lamp, comprising: a driving circuit providing a first voltage signal and a second voltage signal; and a transformer comprising: a winding rack; a magnetic core, wherein one portion of the magnetic core is inserted into the winding rack; a first primary winding set wound around the winding rack and coupled to the first voltage signal; a second primary winding set wound around the winding rack, disposed away from the first primary winding set at a predetermined distance d, and coupled to the second voltage signal, wherein the first and second voltage signals are substantially equal; a first secondary winding set wound around the winding rack and disposed between the first primary winding set and the second primary winding set and close to the first primary winding set, wherein the first secondary winding set induces a third voltage signal to drive the first lamp; and a second secondary winding set wound around the winding rack and disposed between the first primary winding set and the second primary winding set and close to second primary winding set, wherein the second secondary winding set induces a fourth voltage signal to drive the second lamp; wherein the first primary winding set and the second primary winding set have substantially the same number of windings, and the first secondary winding set and the second secondary winding set have substantially the same number of windings.