| 摘要 |
<p>In a circuit arrangement for the high-frequency operation of a low- pressure discharge lamp, an active harmonics filter is provided in addition to a mains rectifier (2), a push-pull frequency generator (3) and a series resonant circuit (4). The filter consists of two series circuits, arranged in parallel with one another, of in each case two diodes (D8, D9; D10, D11) which are connected in direct-current forward direction to the mains rectifier (2). In addition, the filter in each case contains a capacitor (C7, C8), which connects the centre tap (M2) between the two first diodes (D8, D9) to the centre tap (M1) between the two transistors (T1, T2) and, respectively, to the tap (M3) between the resonance inductance (L1) and the first electrode of the lamp (LP) and an inductance (L2), which connects the centre tap (M4) between the two second diodes (D10, D11) to the centre tap (M1). The filter ensures a sinusoidal mains current consumption corresponding to the IEC regulations even in the case of lamps having a higher power consumption.
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