Patent ID: 6181079
Filing Date: 2001-01-30
Classification: H05B,Y02B

Abstract:
A high frequency electronic ballast circuit for one or more discharge lamps comprising:first and second input terminals for connection to a source of low frequency supply voltage for the electronic ballast circuit,An input stage comprising;a transistor switch,a transformer-inductor having a primary winding, a secondary winding and an inductor,a capacitor,a rectifier,a storage capacitor,first means connecting the inductor, the capacitor, the transformer primary winding and the transistor switch to said first and second input terminals to form a high-frequency converter circuit,a control circuit supplying a high frequency switching signal to the transistor switch as a function of at least first and second control signals derived from said transformer-inductor,second means connecting the rectifier and storage capacitor to the transformer secondary winding, andan output stage comprising;a DC/AC inverter circuit including an LC resonant circuit,connection terminals for at least one discharge lamp, andmeans coupling ballast capacitor means to said connection terminals and to a resonant element of the LC resonant circuit.