Electronic fluorescent lamp ballast

Details Electronic fluorescent lamp ballast Electronic fluorescent lamp ballast

1991-03-04

1993-02-09

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315209R, 315224, 315DIG7, H05B 3702

Patent

active

051855607

ABSTRACT:
A half-bridge inverter is powered from a constant-magnitude DC supply voltage and provides at the inverter's output a first AC output voltage that is describable as a modified squarewave voltage. This first AC voltage is applied across a series-combination of an inductor and a capacitor, the junction between which is clamped to the DC supply voltage. As a result, a second AC voltage gets established across the capacitor; which second AC voltae is also describable as being a modified squarewave voltage. However, the phasing of the second AC voltage is delayed by approximately 90 degrees with respect to the first AC voltage; which results in the voltage across the inductor being of approximately sinuosidal waveform. A fluorescent lamp is connected in series with a ballast capacitor; and the lamp-capacitor series combination is connected across the inductor, thereby reslting in a nearly sinusoidal current being provided to the fluorescent lamp.

REFERENCES:
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patent: 4887007 (1989-12-01), Almering et al.
patent: 4965493 (1990-10-01), Van Meurs et al.
patent: 5010298 (1991-04-01), Kang
patent: 5068573 (1991-11-01), Bruning et al.

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