Patent ID: 6784624
Filing Date: 2004-08-31
Classification: H02J,H05B,Y02B

Abstract:
An electronic ballast system comprising:a) an EMI filter having an input connected to a source of excitation and an output for providing a filtered output therefrom; b) a full-wave rectifier having an input connected to said output of said EMI filter and an output for providing a rectified dc voltage; c) a power factor correction circuit having an input connected to said output of said full-wave rectifier and an output for providing a power factor regulated output therefrom; d) a first inverter ballast circuit having an input connected to said output of said power factor correction circuit, said first inverter ballast circuit having a first sweep frequency circuit for supplying an oscillating current to power a first fluorescent lamp, without the need for preheating said lamp; and e) an emergency inverter ballast circuit for supplying power to said first fluorescent lamp when said first inverter ballast circuit is disabled, without preheating said first fluorescent lamp.