Patent ID: 6034487
Filing Date: 2000-03-07
Classification: H05B,Y10S

Abstract:
A lighting circuit for a discharge lamp, comprising:a DC power supply circuit having a coil and a capacitor at an input stage of said power supply circuit;a DC-AC converter for converting an output voltage of said DC power supply circuit to an AC voltage and supplying said AC voltage to a discharge lamp;ignition means for generating an ignition pulse to said discharge lamp; andcontrol means for performing variable control on said output voltage of said DC power supply circuit in such a way as to carry out a boosting operation to boost said output voltage of said DC power supply circuit to a predetermined voltage under a loadless condition while said ignition pulse generated by said ignition means is supplied to said discharge lamp to thereby light said discharge lamp,whereby while said control means is performing said boosting operation on said DC power supply circuit, said ignition means applies said ignition pulse to said discharge lamp to light said discharge lamp.