Patent ID: 7164237
Filing Date: 2007-01-16
Classification: H05B,Y02B,Y10S

Abstract:
1. Circuit arrangement for operating a lamp load comprising input terminals for connection to a supply voltage source, a series arrangement I comprising a first switching element and a second switching element and connecting the input terminals, a control circuit coupled to respective control electrodes of the first switching element and the second switching element for controlling the conductive state of the first and the second switching element, a series arrangement II comprising a first circuit element A and a second circuit element B and connecting the input terminals, a first load circuit comprising a first ballast inductor and first lamp connection terminals and connecting a terminal N characterized in that the circuit arrangement comprises a series arrangement III comprising terminal N a series arrangement IV comprising a third diode D a fifth diode D a sixth diode D a seventh diode D an eighth diode D a second load circuit comprising a second ballast inductor and second lamp connection terminals and connecting a terminal N