Parallel-resonant bridge-inverter fluorescent lamp ballast

Details Parallel-resonant bridge-inverter fluorescent lamp ballast Parallel-resonant bridge-inverter fluorescent lamp ballast

1984-10-16

1987-09-08

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

363 17, 363 58, 315DIG7, 315244, H05B 3702, H05B 3904, H05B 4136

Patent

active

046926674

ABSTRACT:
Center-tapped DC power to a self-oscillating full-bridge inverter-type fluorescent lamp ballast is obtained from a regular power line by way of a voltage doubler. The DC power is supplied to the inverter through an inductor means having two separate windings on a common magnetic core--with one winding being positioned in each leg of the DC power supply. The full-bridge inverter, which comprises four switching transistors connected in usual full-bridge fashion, comprises a center-tapped parallel-tuned L-C circuit connected across its AC output, thereby providing a center-tapped sinusoidal voltage to its load, which consists of a fluorescent lamp connected in series with a current-limiting capacitor. Due to the effect of the inductor means, the current provided to the bridge is substantially constant during a complete period of the inverter's oscillation. The arrangement is symmetrical and provides for the center-tap of the DC voltage source to be at the same potential as the center-tap of the inverter's AC output; which means that the center-tap of this inverter or ballast output may be grounded without the need for using an isolation transformer.

REFERENCES:
patent: 3896336 (1975-07-01), Schreiner et al.
patent: 4117377 (1978-09-01), Jimerson et al.
patent: 4175246 (1979-11-01), Feinberg et al.
patent: 4259614 (1981-03-01), Kohler
patent: 4277726 (1981-07-01), Burke
patent: 4346332 (1982-08-01), Walden
patent: 4392087 (1983-07-01), Zansky

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