METHOD OF IGNITING A LAMP, CONTROLLER FOR A LAMP, AND A LAMP CONTROLLED BY A CONTROLLER

摘要

A method of igniting a lamp is disclosed. The lamp may be a compact fluorescent lamp. The method is directed in particular to reducing or eliminating hard-switching of half-bridge switches driving a lamp. The method operates by reducing the on-time of at least one of the switches, in response to saturation of the ballast inductor. The method can operate immediately upon saturation of the ballast inductor, or allow a predetermined level of saturation. The method operates by increasing the slope of the sawtooth timing circuit.