Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1993-11-18
1995-06-20
Pascal, Robert J.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315291, 315307, 315308, 315209R, 315DIG2, 315227R, H05B 3700
Patent
active
054263506
ABSTRACT:
A novel high frequency LCLC double resonant electronic ballast has been developed for gas discharge lamp applications. The ballast consists of a half-bridge inverter which switches at zero voltage crossing and an LCLC resonant circuit which converts a low ac voltage to a high ac voltage. The LCLC resonant circuit has two LC stages. The first LC stage produces a high voltage before the lamp is ignited. The second LC stage limits lamp current with the circuit inductance after the lamp is ignited. In another embodiment a filament power supply is provided for soft start up and for dimming the lamp. The filament power supply is a secondary of the second resonant inductor.
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Licitra C et al, "Single-Ended Soft-Switching Electronic Ballast with Unity Power Factor", 1991 IEEE Industry Applications Society Annual Meeting, vol. I, No. 91CH3077-5.
Electric Power Research Institute Inc.
Maccoun James W.
Pascal Robert J.
Ratliff Reginald A.
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