Patent ID: 6134132
Filing Date: 2000-10-17
Classification: H02M,H05B,Y02B

Abstract:
A circuit arrangement for supplying a lamp comprising: a DC/AC converter for generating, from an input voltage, a high-frequency lamp current at a frequency f,input terminals for connection to terminals of a power supply source supplying the input voltage,a first branch interconnecting the input terminals and comprising a series arrangement of a first switching element and a second switching element,a first control circuit coupled to a control electrode of the first switching element for rendering the first switching element conducting and non-conducting,a second control circuit coupled to a control electrode of the second switching element and also coupled to a point P of the first control circuit for rendering the second switching element conducting dependent upon the voltage present at the point P,a load circuit shunting one of the switching elements and having terminals for connection of a lamp,wherein the DC/AC converter includes a third control circuit for rendering the second switching element conducting during a time interval .DELTA.t1, which is smaller than 1/2f, after the first switching element has become non-conducting.