Patent ID: 6144167
Filing Date: 2000-11-07
Classification: H02M,H05B,Y02B

Abstract:
A DC/DC converter circuit for supplying a lamp comprising:a first input terminal and a second input terminal for connection to a power supply source supplying a DC voltage,a transformer having a primary winding and a secondary winding,a first branch interconnecting the input terminals and comprising a series arrangement of a switching element and the primary winding,a control circuit coupled to a control electrode of the switching element for generating a control signal so as to render the switching element high-frequency conducting and non-conducting,a second branch comprising a series arrangement of a first unidirectional element and a first capacitive element and connecting a first end of the secondary winding to a second end, anda first output terminal and a second output terminal for connecting a load circuit comprising the lamp,characterized in that the ends of the secondary winding are also connected by means of a third branch which comprises a series arrangement of a second unidirectional element and a second capacitive element, and in that a terminal between the first unidirectional element and the first capacitive element is connected to the first output terminal, and a terminal between the second unidirectional element and the second capacitive element is connected to the second output terminal.