PROCESS AND CIRCUIT ARRANGEMENT FOR OPERATING COLD CATHODE DISCHARGE LAMPS

摘要

PCT No. PCT/DE96/02233 Sec. 371 Date Jul. 17, 1997 Sec. 102(e) Date Jul. 17, 1997 PCT Filed Nov. 21, 1996 PCT Pub. No. WO97/19574 PCT Pub. Date May 29, 1997A first intermediate direct voltage is generated from a current source or onboard voltage, and a second sinusoidal intermediate alternating voltage is generated with a current inverter. This intermediate alternating voltage is transformed by one or more transfer systems to the various triggering and maintaining voltages of different cold cathode discharge lamps. Frequency-synchronous dimming is regulated by the pulse-pause ratio of a pulse group regulator in a broad frame by optically commanded triacs which are triggered in the zero crossing. The preconditions for the starting and maintenance characteristics of the lamps are thus always ensured.