Patent ID: 7586269

Claim:
A driving device for driving at least one lamp, the driving device comprising: a power stage circuit for converting a received direct current (DC) signal to an alternating current (AC) signal; a transformer circuit connected to the power stage circuit, for stepping up the AC signal, the transformer circuit comprising: a transformer having a primary winding and a secondary winding, the transformer comprising a leakage inductor; and a capacitor connected between a high voltage terminal and a low voltage terminal of the secondary winding of the transformer for resonance with the leakage inductor of the transformer; at least one resonance circuit connected between the high voltage terminal and the low voltage terminal of the secondary winding of the transformer of the transformer circuit, for converting the stepped up AC signal to an appropriate signal to drive the at least one lamp; and a pulse width modulation (PWM) controller connected to the power stage circuit, for controlling output of the power stage circuit; wherein the at least one resonance circuit and the capacitor of the transformer circuit are in a parallel connective relationship between the high voltage terminal and the low voltage terminal of the secondary winding of the transformer.