Patent ID: 6376997
Filing Date: 2002-04-23
Classification: H05B,Y10S

Abstract:
Circuit arrangement for operating a discharge lamp with a high frequency current comprising:input terminals for connection to a source of low frequency supply voltage, rectifier means coupled to said input terminals for rectifying said low frequency supply voltage, a first circuit comprising a series arrangement of first unidirectional means, second unidirectional means and first capacitive means coupled to a first output terminal (N3) of said rectifier means and a second output terminal (N5) of said rectifier means, inverter means shunting said first capacitive means for generating the high frequency current, a load circuit comprising a series arrangement of inductive means, second capacitive means and means for applying a voltage to the discharge lamp, said load circuit connecting a terminal (N1) of said inverter means to a terminal (N2) between the first unidirectional means and the second unidirectional means, and a second circuit comprising third capacitive means and connecting terminal (N2) to terminal (N5), a third circuit connecting the first output terminal (N3) of the rectifier means to a terminal (N4) between the second unidirectional means and the first capacitive means, said third circuit comprising a series arrangement of third unidirectional means and fourth unidirectional means, and a fourth circuit connecting a terminal (N7) between said third unidirectional means and said fourth unidirectional means to a terminal (N6) that is part of the load circuit, said means for supplying a voltage to the discharge lamp comprising a transformer including a series arrangement of two primary windings included in the load circuit and a secondary winding, said terminal (N6) being situated between the two primary windings.