| 摘要 |
A circuit arrangement for operating at least one high-pressure discharge lamp (16), has four switches (Q1 to Q4) in a full-bridge arrangement (14), a first and a second switch (Q1, Q2) forming the first half-bridge arm, and a third and a fourth switch (Q3, Q4) forming the second half-bridge arm, at least two terminals for coupling the high-pressure discharge lamp (16) between the midpoint of the first and the second half-bridge arms, at least two terminals for supplying the circuit arrangement (10) with a dc voltage signal and a drive circuit (20) for driving the four switches (Q1 to Q4). The drive circuit (20) is designed to provide drive signals, (z1(t), z2(t), z1(t), z2(t)) for the four switches (Q1 to Q4), whose clock pulse (ft) is swept between a first and a second frequency, and whose pulse width and/or phase is modulated with a prescribable third frequency (fa).
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