Operating discharge lamps esp. HP lamps for large spaces - superimposing wide band of higher frequencies on basic drive frequency to give smooth running of discharge lamps

摘要

The wide band of higher frequencies is self generated by a resonance alternating effect between the discharge lamp and a resonant circuit tuned externally related to its parameters. The circuit for operating the discharge lamps, consists of a mains connection device coupled with the discharge lamp (1), with the discharge lamp having a differential negative, non-linear resistance, is arranged in an oscillatory circuit. The choke (3) with the inductance (L) is connected in series to the discharge lamp (1), and the capacitor (4) with the capacitance (C) is connected in parallel to both, whereby the resonant circuit is connected with an AC voltage source (5) parallel to the capacitor (4) across the starting choke (2) with the inductance (D). ADVANTAGE - Arc instabilities are effectively prevented to give table running over long periods.