Patent ID: 7755296

Claim:
A resonant inverter circuit, comprising: a resonant circuit, comprising a capacitor and a transformer, for operating a lamp; wherein said transformer comprises a first winding connected in series with said lamp, a second winding and a third winding for generating control signals in response to a switching current of said resonant inverter circuit; a first control circuit and a second control circuit, for respectively generating a first switching signal and a second switch signal in response to control signals, wherein said first switching signal or said second switch signal is enabled once said control signal is higher than a high-threshold, and said switching signal is disabled once said control signal is lower than a low-threshold; and wherein a level of said high-threshold is higher than a level of said low-threshold; and a first transistor and a second transistor, coupled to switch the resonant inverter circuit respectively in response to said first switching signal and said second switch signal; wherein said second winding and said third winding of said transformer are coupled to generate supply voltages via diodes and capacitors to provide power sources to said first control circuit and said second control circuit.