Patent ID: 7262562
Filing Date: 2007-08-28
Classification: H05B

Abstract:
1. An inverter circuit for driving a fluorescent lamp, the inverter circuit comprising: a DC voltage source for providing a DC voltage; a voltage control circuit coupled to the DC voltage source, receiving the DC voltage and a voltage control signal and outputting a two-level DC square wave; a bridge DC/AC converter coupled to the voltage control circuit, converting the two-level DC square wave to an AC square wave in accordance with a feedback pulse-width modulating (PWM) signal; and a feedback control unit coupled to the bridge DC/AC converter and the voltage control circuit, providing a feedback pulse-width modulating signal to the bridge DC/AC converter in response to a current passing through the fluorescent lamp, and providing the voltage control signal to the voltage control circuit so as to adjust a duration of each level in the two-level DC square wave.