Patent ID: 8564221
Filing Date: 2013-10-22
Classification: H05B

Abstract:
1. A driving circuit system for gas discharge lamp, comprising: a power circuit having a first switch for converting an input voltage into a lamp voltage for driving a gas discharge lamp in accordance with switching operations of the first switch; a lamp current detecting circuit connected to the power circuit or the gas discharge lamp for detecting a lamp current of the gas discharge lamp; a feedback circuit connected to the lamp current detecting circuit for generating a lamp current feedback signal in accordance with variations of the lamp current; a constant power control circuit for generating a corrected current reference signal in accordance with a status of the gas discharge lamp; and a power control circuit connected to the feedback circuit, the constant power control circuit, and the first switch of the power circuit for generating a first modulating signal in accordance with the lamp current feedback signal and the corrected current reference signal for driving the first switch to turn on or off, thereby substantially maintaining a lamp power of the gas discharge lamp at a constant value.