Patent ID: 6853156
Filing Date: 2005-02-08
Classification: H05B

Abstract:
1. A piezoelectric ceramic light starter comprising: a power switch, which is connected to a pulse width modulated (PWM) harmonic signal output terminal, and turns on during the positive period of the PWM harmonic signal and off during the negative period; a piezoelectric transformer, which has an input terminal for its first-level coil is connected to the power switch and generates a high-frequency AC signal at its output terminal to drive a cold cathode fluorescent light (CCFL); and a frequency tracking unit, which is coupled to the output terminal of the CCFL to obtain a first frequency when the starter lights up the CCFL and a second frequency when the CCFL is turned off, wherein the average of the first frequency and the second frequency is used as the output basis for the PWM harmonic signal.