Electronic ballast with improved lamp current crest factor

Details Electronic ballast with improved lamp current crest factor Electronic ballast with improved lamp current crest factor

1987-08-24

1991-05-07

Britton, Howard W.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315DIG7, 315283, 315174, 315276, 331 76, 307 3, 307 5, 363 40, H05B 4116

Patent

active

050139746

ABSTRACT:
An inverter-type electronic fluorescent lamp ballast powers a fluorescent lamp with a sinusoidal current that is modified by insertion of a measured amount of properly phased third harmonic current, thereby attaining a lamp current crest factor that is substantially better than the 1.4 crest factor associated with a purely sinusoidally-shaped current.

REFERENCES:
patent: 2117752 (1938-05-01), Wrathall
patent: 3555352 (1971-01-01), Michalski
patent: 3983449 (1976-09-01), Dear et al.
patent: 4007416 (1977-02-01), Szatmari
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4723098 (1988-02-01), Grubs

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