Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1999-01-19
2000-07-04
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315209R, 315224, 315307, G05F 100
Patent
active
060843624
ABSTRACT:
An electronic ballast capable of linear and stepless light regulation that utilizes a chopped positive pulse passing through a limiting inductor and through two cathode coils of a fluorescent tube to a first mutual inductor and passing through a second transistor to excite the fluorescent lamp to radiate light. The luminosity is dependent upon the size of the portion of the positive pulse of the sinusoidal wave that is chopped. The chopped positive pulse utilizes the counter electromotive force generated by a first mutual inductor with respect to second and third mutual inductors to form semi-symmetrical resonance to maintain the pulse signals that pass through the fluorescent lamp to thereby continuously excite the cathode coils of the fluorescent lamp so that the latter always has the required luminosity. In this way, chopped power source waveforms are used to achieve linear light regulation so as to achieve zero dissipation, non-flashing during light regulation, and an increased light regulation range.
REFERENCES:
patent: 4553070 (1985-11-01), Sairanen et al.
patent: 5408162 (1995-04-01), Williams
patent: 5739645 (1998-04-01), Xia et al.
patent: 5828187 (1998-10-01), Fischer
Philogene Haissa
Tran Thuy Vinh
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