Chopper for conventional ballast system

Details Chopper for conventional ballast system Chopper for conventional ballast system

1989-07-10

1990-11-13

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315DIG7, 315287, 315224, H05B 3702

Patent

active

049704370

ABSTRACT:
A chopper circuit is series connected between a conventional ballast and the fluorescent lamps to provide a high frequency current to the lamps to increase and adjust the luminance thereof. The chopper circuit comprises a diode bridge with a transistor connected across the DC terminals thereof. The lamps are series connected with the AC terminals. A photocell is used in a feedback circuit to maintain constant lighting.

REFERENCES:
patent: 3619716 (1971-11-01), Spira
patent: 3896336 (1975-07-01), Schreiner
patent: 3906302 (1975-09-01), Wijsboom
patent: 3913002 (1975-10-01), Steigerwald
patent: 4005337 (1977-01-01), Rabe
patent: 4358711 (1982-11-01), Bex
patent: 4375608 (1983-03-01), Kohler
patent: 4388563 (1983-06-01), Hyltin
patent: 4410837 (1983-10-01), Suzuki et al.
patent: 4672300 (1987-06-01), Harper
patent: 4728865 (1988-03-01), Daniels
patent: 4728866 (1988-03-01), Capewell et al.
patent: 4766350 (1988-08-01), Husgen et al.
patent: 4803406 (1989-02-01), Yasuda et al.
patent: 4818917 (1989-04-01), Vest
patent: 4904903 (1990-02-01), Pacholok
patent: 4906899 (1990-03-01), Hope et al.

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