| 摘要 |
<p>The invention relates to a circuit arrangement for operating a discharge lamp, provided with input terminals for coupling to the poles of a supply voltage source which delivers a low-frequency supply voltage; rectifying means provided with inputs coupled to the input terminals for rectifying the low-frequency supply voltage, and provided with output terminals; a branch (D) which interconnects the output terminals and which comprises a series arrangement of first unidirectional means (D1), second unidirectional means (D2), and third unidirectional means (D3), the first and the second unidirectional means being shunted by first capacitive means (C1), and the second and the third unidirectional means being shunted by second capacitive means (C2); an ohmic resistor (R) which passes a current during lamp operation with which the first and the second capacitive means are charged; means (M) for generating a lamp current from the voltages present across the first and the second capacitive means. According to the invention, the ohmic resistor (R) is placed in a branch (I) which passes a low-frequency alternating current during lamp operation and which connects an input terminal to an input of the rectifying means. This achieves that the circuit arrangement has a high power factor while at the same time RFI gnerated by the means (M) is effectively suppressed.</p> |
