Low height ballast for fluorescent lamps

Details Low height ballast for fluorescent lamps Low height ballast for fluorescent lamps

1994-04-15

1996-03-19

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315206, 315209R, 315DIG5, H05B 3702

Patent

active

055005764

ABSTRACT:
An electronic ballast has a high voltage portion and a low voltage portion. The high voltage portion includes a converter, having a variable frequency boost circuit, and a half-bridge, driven inverter having a series resonant, direct coupled output. The low voltage portion of the ballast includes a control circuit and fault detectors for shutting off the boost circuit and the inverter circuit. The fault detectors consume very little power when the ballast and lamp are functioning normally. Separate magnetics are used for boost, inverter, and output. Each magnetic is essentially cubic in shape and carries as little current as possible.

REFERENCES:
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
patent: 4523131 (1985-06-01), Zansky
patent: 4562383 (1985-12-01), Kerscher et al.
patent: 5214355 (1993-05-01), Nilssen
patent: 5363020 (1994-11-01), Chen et al.

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