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Patent Searching and Data


Title:
ELECTRONIC BALLAST WITH DC OUTPUT FLYBACK CONVERTER
Document Type and Number:
WIPO Patent Application WO2004034741
Kind Code:
A3
Abstract:
A fluorescent lamp electronic ballast includes a DC to DC tlyback converter (16), a commutator circuit (18, 28 and 30), and a current sensor (20). The flyback converter (16) includes a tlyback transformer (TI) connected to a diode/capacitor (D1-D8. C2) combination, and includes a switch (U3) used to produce a flyback waveform that is rectified by the diode (D6-D8) and results in a high voltage DC output at the capacitor (C2). The commutator circuit receives the high voltage DC output and converts the high voltage DC output to an AC signal for operating the fluorescent lamp (24, 26). The current sensor (20) senses a DC lamp current from the output of the tlyback converter (16) and provides a current sense signal to the flyback converter (16). The flybick converter switch (16) is controlled based on the current sense signal. Preferred ballasts advantageously provide a continuously dimmable lamp load, a universal type ballast for a wide range of lamp loads and combinations, and programmed start.

Inventors:
NEMIROW ARTHUR T (US)
SEARS STORM S (US)
Application Number:
US0330780W
Publication Date:
August 04, 2005
Filing Date:
September 29, 2003
Export Citation:
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Assignee:
BRUCE INDUSTRIES, INC.
NEMIROW, ARTHUR, T.
SEARS, STORM, S.
International Classes:
H05B41/282; H05B41/298; H05B41/392; (IPC1-7): H02J7/00; H05B41/36; H05B37/02
Foreign References:
US4504775A1985-03-12
US4870327A1989-09-26
US5483127A1996-01-09
Other References:
See also references of EP 1579545A2
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