Ballast filtering scheme for reduced harmonic distortion

Details Ballast filtering scheme for reduced harmonic distortion Ballast filtering scheme for reduced harmonic distortion

1994-10-14

1996-09-24

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315209R, 315244, 363 47, 363 48, 333175, 333176, 333177, 333181, H02M 112

Patent

active

055593968

ABSTRACT:
A ballast filter in which the ballast can operate at a total harmonic distortion of power line current of less than 10%. Power dissipated by the filter when at a THD of less than 10% is relatively low. The input impedance of the ballast is chosen to be no greater than twice the equivalent filter impedance of a front end filter and no less than the equivalent filter impedance/1.5. The filter includes a transformer having a core which at times operates within the non-linear region of its B-H curve under nominally rated ballast load conditions.

REFERENCES:
patent: 4672522 (1987-06-01), Lesea
patent: 4686427 (1987-08-01), Burke
patent: 4937719 (1990-06-01), Yamada et al.
patent: 5021716 (1991-06-01), Lesea
patent: 5047691 (1991-09-01), Lesea et al.
patent: 5148359 (1992-09-01), Nguyen
patent: 5148360 (1992-09-01), Nguyen
Electronics Engineer's Reference Book, Fifth Edition, Edited By F. F. Mazda, First Published 1983, pp. 36/3-36/7.

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