Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1995-11-14
1998-11-10
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315219, 315224, 363124, H05B 3702
Patent
active
058349073
ABSTRACT:
An inverter apparatus of the present invention has a cold cathode tube and its operating circuit provided with a piezoelectric transformer. Specifically, for increasing the boost ratio of the piezoelectric transformer, a boost chopper is mounted in the premier stage of a semi-class E voltage resonance inverter and a power switch element is mounted operable commonly for both the inverter and the chopper so that a single voltage resonance controller IC controls the cold cathode tube at a constant current. As the operating circuit is composed of the voltage transformer, the apparatus will be minimized in the number of components and decreased in the overall size and the production cost. Also, as the operating frequency of the cold cathode tube is increased by increasing the resonance frequency of the piezoelectric frequency, the discharge efficiency will also be enhanced.
REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4350930 (1982-09-01), Peil et al.
patent: 5063490 (1991-11-01), Maehara et al.
Minebea Co. Ltd.
Pascal Robert J.
Vu David H.
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