Patent ID: 6320357
Filing Date: 2001-11-20
Classification: H02H,H02M,H05B,Y02B

Abstract:
A circuit arrangement for supplying a load comprising a discharge lamp from an AC supply voltage source at a high power factor, comprising means for generating a DC voltage provided withinput terminals for connection to an AC supply voltage source,rectifying means coupled to the input terminals for rectifying an AC voltage supplied by the AC supply voltage source,output terminals for connection to the load,a DC-DC converter connected between the rectifying means and the output terminals and provided with first inductive means, a first unidirectional element and a switching element, andcharacterized in that the output terminals are interconnected by a circuit branch which comprises a series arrangement of an impedance and first capacitive means, which impedance is shunted by a further unidirectional element,whereby the current taken up from the AC supply voltage source is approximately sinusoidal in shape and approximately in phase with the AC voltage.