Patent ID: 7084582
Filing Date: 2006-08-01
Classification: H02J,H05B,Y02B

Abstract:
1. 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 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) an 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 supply oscillating current to power a first fluorescent lamp, without the need for preheating said lamp; and e) an electronic chip in said ballast circuit adapted to limit voltage increase in said lamp, wherein said inverter ballast circuit further comprises fault control logic arranged in parallel with said fluorescent lamp and connected to an output and an input of said sweep frequency circuit and having means for disabling said sweep frequency circuit when said fluorescent lamp becomes inoperable.