Single-ended ballast circuit

Details Single-ended ballast circuit Single-ended ballast circuit

1990-06-20

1991-07-02

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315209R, 315244, H05B 4124

Patent

active

050288466

ABSTRACT:
A single-ended ballast circuit employs a power-factor-correcting network (510); a DC power supply (512); a free-running oscillator (516); a transistor (518); a current-limiting (ballasting) network (520); and two fluorescent lamps (524). The transistor (518) is configured as a switch connected to be responsive to a signal generated (630) by the oscillator (516) and operative to periodically couple a line (734) to a circuit common. The current-limiting (ballasting) network (520) includes an inductor or transformer (740) having a primary winding (744), connected between a DC power-supply potential and the line (734), and a secondary winding (746); a first capacitor (750), connected between the line (734) and circuit common; an inductor (752); a second capacitor (756), connected in series with the inductor (752) across the secondary winding (746); and a third capacitor (754), connected in series with the lamps (524) across the second capacitor (756).

REFERENCES:
patent: 2982881 (1961-05-01), Reich
patent: 4246515 (1981-01-01), Schauffele
patent: 4257088 (1981-03-01), Nilssen
patent: 4348615 (1982-09-01), Garrison et al.
patent: 4415839 (1983-11-01), Lesea
patent: 4486821 (1984-12-01), Itakura
patent: 4544863 (1985-10-01), Hashimoto
patent: 4559478 (1985-12-01), Fuller et al.
patent: 4581562 (1986-04-01), Nilssen
patent: 4613796 (1986-09-01), Bay
patent: 4698741 (1987-10-01), Pacholok
patent: 4806830 (1989-02-01), Ueki

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