H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/16 (2006.01) H05B 41/292 (2006.01) H05B 41/392 (2006.01)
Patent
CA 2475400
The present invention relates to a circuit arrangement for operating at least one high-pressure discharge lamp (16) , having 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) being designed to provide drive signals, (z1(t), z2(t), ~1(t), ~2(t)) for the four switches (Q1 to Q4), whose clock pulse (f t) is swept between a first and a second frequency, and whose pulse width and/or phase is modulated with a prescribable third frequency (f a).
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Smart & Biggar
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