Energy-efficient cost-effective electronic ballast

Details Energy-efficient cost-effective electronic ballast Energy-efficient cost-effective electronic ballast

1992-07-02

1995-04-04

Pascal, Robert J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315106, 315224, 315DIG5, 315DIG7, H05B 4136

Patent

active

054040833

ABSTRACT:
An inverter-type electronic fluorescent lamp ballast normally powers a fluorescent lamp by way of a series-excited parallel-loaded resonant L-C circuit. During the lamp starting phase, as well as whenever the lamp is inoperative or not connected, inverter frequency is automatically increased substantially beyond resonance, thereby preventing circuit self-destruction which would otherwise probably result whenever an inverter is used for series-exciting an unloaded resonant L-C circuit.

REFERENCES:
patent: 4060751 (1977-11-01), Anderson
patent: 4060752 (1977-11-01), Walker
patent: 4259614 (1981-03-01), Kohler
patent: 4346332 (1982-08-01), Walden
patent: 4398126 (1983-08-01), Zuchtriegel
patent: 4538095 (1985-08-01), Nilssen
patent: 4641061 (1987-03-01), Munson
patent: 5013973 (1991-05-01), Nilssen

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