High power factor electronic ballast

Details High power factor electronic ballast High power factor electronic ballast

1997-08-06

1998-09-29

Hecker, Stuart N.

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

323266, 363 35, 363 89, 315290, 315307, 315308, G05F 1613

Patent

active

058149767

ABSTRACT:
A high power factor electronic ballast for operating a high pressure gas discharge lamp comprises a boost converter function and a buck function. The boost converter function and the buck function have common components. The combination boost-buck converter reduces parts count, as compared to the parts count required for the separate boost and buck circuits of the prior art, by making some components of the single circuit act simultaneously in both the boost and buck functions. The rigid forcing of the ac input current waveform to follow the ac input voltage waveform is relaxed, to give performance priority to the buck function for the common components. Harmonics are allowed to enter the system in moderation in return for a less expensive and more reliable system that does not compromise lamp power control.

REFERENCES:
patent: 4184197 (1980-01-01), Cuk et al.
patent: 5343140 (1994-08-01), Gegner
patent: 5408403 (1995-04-01), Nerone et al.
patent: 5426346 (1995-06-01), Allison
patent: 5430405 (1995-07-01), Cohen

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