High efficiency electronic ballast

Details High efficiency electronic ballast High efficiency electronic ballast

1997-12-17

1999-02-09

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315209R, 315209CD, 315244, 315225, G05F 100

Patent

active

058699376

ABSTRACT:
An electronic ballast (100) for powering at least one gas discharge lamp (10) comprises an inverter (300), an output circuit (400), and a switching circuit (500). Output circuit (400) includes a resonant inductor (440) and a resonant capacitor (460). Switching circuit (500) is coupled between the resonant capacitor (460) and an AC ground node such as circuit ground node (60), and is operable to effectively disconnect the resonant capacitor (460) after the lamp (10) ignites, thereby eliminating circulating current and significantly enhancing ballast energy efficiency. Switching circuit preferably comprises an electronic switch (600) and a pulse circuit (700), and optionally includes a diode matrix for use in ballasts for powering two or more lamps. In one embodiment, pulse circuit (800) monitors for lamp replacement and provides automatic ignition of a replaced lamp.

REFERENCES:
patent: 5134344 (1992-07-01), Vos et al.
patent: 5444333 (1995-08-01), Lau
patent: 5694006 (1997-12-01), Konopka
patent: 5694007 (1997-12-01), Chen
patent: 5696431 (1997-12-01), Giannopoulos et al.

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