Operating circuit arrangement for a discharge lamp

Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation

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Details

315DIG7, 315DIG5, 315200R, 315DIG4, 315244, 315224, 315205, 315241R, G05F 100

Patent

active

053349156

ABSTRACT:
An operating circuit arrangement for a discharge lamp has a chopper circuit and an inverter circuit. The inverter circuit generates a high frequency voltage to start and operate the discharge lamp. The chopper circuit supplies a d.c. voltage to the inverter circuit. The circuit arrangement has a chopper control circuit and an inverter control circuit which are coupled to the chopper circuit so that the operation of each control circuit responds to the chopper circuit. In order to perform a soft starting operation in which the inverter circuit generates a given high frequency voltage to start and operate the discharge lamp prior to the generation of a given level of d.c. voltage generated by said chopper circuit, an inverter control circuit coupled to the inverter circuit is provided.

REFERENCES:
patent: 4042856 (1977-08-01), Steigerwald
patent: 5140224 (1992-08-01), Kakitani et al.

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