Patent ID: 6225755
Filing Date: 2001-05-01
Classification: H05B,Y02B,Y10S

Abstract:
In an electronic ballast circuit for driving a gas discharge lamp from a mains voltage signal supply, a ballast bridge unit having an upper and lower signal line comprises:a capacitive bridge having at least two capacitors coupled in series at a common reference voltage signal terminal, wherein one of said capacitors is coupled to the upper signal line of the bridge unit and another one of said capacitors is coupled to the lower signal line of said bridge unit;a bridge having at least two diodes coupled in series at a rectifier bridge common terminal, wherein one of said diodes is coupled to the upper signal line of the bridge unit and another one of said diodes is coupled to the lower signal line of said bridge unit;an input converter bridge having at least two switches coupled in series at an input common terminal, wherein an upper switch of said input converter bridge is coupled to the upper signal line of the ballast bridge unit and the lower switch of said input converter bridge is coupled to the lower signal line of the ballast bridge unit; andan output converter bridge having at least two switches coupled in series at an output common terminal, wherein an upper switch of said output converter bridge is coupled to the upper signal line of the ballast bridge unit and the lower switch is coupled to the lower signal line of the ballast bridge unit.