Patent ID: 6664743
Filing Date: 2003-12-16
Classification: H05B

Abstract:
A circuit arrangement for feeding a lamp comprisinga first input terminal and a second input terminal which are to be connected to a supply voltage source supplying a DC voltage, an inverter for generating a square-wave periodic voltage from said DC voltage, the inverter including a series arrangement of a first switching element, a first inductive element, a second inductive element and a second switching element, and which inverter interconnects the input terminals, a control circuit coupled to a control electrode of the first switching element and to a control electrode of the second switching element, the control circuit generating a control signal for rendering the first and the second switching element alternately conducting and non-conducting, a load branch comprising a third inductive element, lamp terminals for connecting the lamp, and a first capacitive element, a first unidirectional element having an anode coupled to the second input terminal and a cathode coupled to a point between the first switching element and the first inductive element, a second unidirectional element having a cathode coupled to the first input terminal and an anode coupled to a point between the second switching element and the second inductive element, characterized in that the self-inductances L1â€², L2â€² and L3â€² of, respectively, the first, second and third inductive element, satisfy the following relationship; L3â€²>5*L1â€² and L3â€²>5*L2â€².