Apparatus and method for driving fluorescent lamp

摘要

An apparatus and a method for driving a fluorescent lamp are provided. The apparatus submitted by the present invention includes a power switching circuit, an LC resonator and an automatic frequency tracing circuit. The power switching circuit is coupled between an input voltage and a ground potential, and is used for switching and outputting the input voltage and the ground potential in response to a ramp signal and a comparison voltage so as to generate a square signal. The LC resonator is used for receiving and converting the square signal to generate a sinusoidal driving signal for driving the fluorescent lamp. The automatic frequency tracing circuit is used for generating and adjusting the ramp signal according to a feedback signal related to the sinusoidal driving signal, so as to make a frequency of the sinusoidal driving signal automatically following a resonant frequency of the LC resonator.