APPARATUS FOR OPERATING DISCHARGE LAMP

摘要

PCT No. PCT/JP90/00404 Sec. 371 Date Nov. 27, 1990 Sec. 102(e) Date Nov. 27, 1990 PCT Filed Mar. 27, 1990 PCT Pub. No. WO90/11672 PCT Pub. Date Oct. 4, 1990.An apparatus for operating a discharge lamp is disclosed in which a voltage supplied from a commercial alternating current source is fed to a feedback-controlled, saturable current transformer having a primary winding, secondary windings and control winding and to a self-excited inverter circuit having a rectifier circuit. The discharge lame is lit upon receipt of an AC output obtained through reconversion by the inverter circuit. An impedance circuit varies an impedance so as to control a current in the control winding. The current in the control winding varies in accordance with a varied impedance to vary a saturation time of the variable current transformer in the inverter circuit and hence an output of the inverter circuit.