Patent ID: 7061781

Claim:
A circuit arrangement for operating light sources having the following features: a rectifier (D 7 , D 8 , D 9 , D 10 ) having a system voltage input (J 1 , J 2 ) which, when a system AC voltage at a system frequency is applied at its system voltage input, provides a rectified system AC voltage at a positive (POS) and a negative rectifier output (NEG), a first diode (D 1 ) which is connected at its anode to the positive rectifier output (POS) and at its cathode to a positive busbar (DCP), a negative busbar (DCN) which is connected to the negative rectifier output (NEG), a third (D 3 ), a fourth (D 4 ), a fifth (D 5 ) and a sixth diode (D 6 ) which are connected in series between the positive (DCP) and the negative busbar (DCN), in each case the cathode of these diodes (D 3 , D 4 , D 5 , D 6 ) being directed towards the positive busbar (DCP), and the connection points of these diodes (D 3 , D 4 , D 5 , D 6 ) forming the following nodes: a first node (N 1 ) between the third (D 3 ) and the fourth diode (D 4 ), a second node (N 2 ) between the fourth (D 4 ) and the fifth diode (D 5 ), and a third node (N 3 ) between the fifth (D 5 ) and the sixth diode (D 6 ), a first (C 1 ) and a second storage capacitor (C 2 ), the first storage capacitor (C 1 ) being connected between the positive busbar (DCP) and the first node (N 1 ), and the second storage capacitor (C 2 ) being connected between the negative busbar (DCN) and the third node (N 3 ), an inverter (T 1 , T 2 ), which is connected to the positive (DCP) and the negative busbars (DCN) for the purpose of supplying power and provides an inverter output voltage at an inverter output (OUT) opposite the negative busbar (DCN), said voltage having an inverter oscillating frequency which is substantially higher than the system frequency, a reactance network which is connected to the inverter output (OUT) and provides output terminals (J 3 , J 4 ) for connecting light sources, the reactance network comprising a lamp inductor (L 1 ) which has a first and a second connection, and the first connection being connected to the inverter output (OUT), a coupling between the reactance network and the node (N 2 ) which brings about a voltage waveform at the node (N 2 ) opposite the negative busbar (DCN) which has the inverter oscillating frequency, a first pump capacitor (C 3 ) which is connected to the node (N 2 ) and to the positive rectifier output (POS), wherein the second connection of the lamp inductor (L 1 ) is connected in each case to a first connection of a first and a second resonant capacitor (C 51 , C 52 ), a second connection of the first resonant capacitor (C 51 ) being connected to the second node (N 2 ), and a second connection of the second resonant capacitor (C 52 ) being connected to the positive (DCP) or negative (DCN) busbar.