Extra efficient electronic ballast for fluorescent lamps

Details Extra efficient electronic ballast for fluorescent lamps Extra efficient electronic ballast for fluorescent lamps

1990-04-26

1991-05-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315256, 315DIG5, H05B 4136

Patent

active

050159232

ABSTRACT:
A power-line-operated ballast for two fluorescent lamps has a self-oscillating half-bridge inverter whose 30 kHz squarewave output voltage is switchably connected either with an auxiliary transformer and/or with a series-resonant L-C circuit. The lamps are series-connected across the tank capacitor of the L-C circuit; the lamps' cathodes are connected with individual outputs of the auxiliary transformer.
When power is initially applied to the ballast, only the auxiliary transformer is connected with the inverter output, thereby providing heating power to the lamps' cathodes. After about 1.5 second, the L-C circuit is automatically connected with the inverter output, and the lamps then ignite in ordinary Rapid-Start manner. The auxiliary transformer is automatically disconnected at the time the L-C circuit is connected, thereby providing for extra high efficiency operation.
In the event the lamps become disconnected or inoperative, the inverter will become disabled within about 15 milli-seconds. However, after about 5 seconds, the inverter starts again. At that time, the L-C circuit has become disconnected and the auxiliary transformer has become re-connected.

REFERENCES:
patent: Re31758 (1984-12-01), Nilssen
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4554487 (1985-11-01), Nilssen

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