U.S. Philips Corporation

Arnold P Stout

Paul R Veldman

Henricus P M Peters

A circuit arrangement for supplying a load which comprises a discharge lamp. The circuit includes apparatus for generating a DC voltage and provided with input terminals for connection to a supply voltage source. A rectifier is coupled to the input terminals for rectifying an AC voltage supplied by the supply voltage source. In addition, there are output terminals for connection to the load and a DC-DC converter connected between the rectifier and the output terminals and provided with a first inductor, a first unidirectional element, and a switching element. The output terminals are interconnected by a circuit branch which comprises a series arrangement of an impedance and a first capacitor, which impedance is shunted by a further unidirectional element. As a result, the inrush current which flows immediately after switching-on of the circuit arrangement is limited.

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Oss, Netherlands

Arnold P Stout