Remote control of fluorescent lamp ballast using power flow inte

Details Remote control of fluorescent lamp ballast using power flow inte Remote control of fluorescent lamp ballast using power flow inte

1990-08-13

1991-10-08

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315DIG4, 315294, 315106, 307 40, H05B 4136

Patent

active

050557467

ABSTRACT:
A dimming ballast system wherein the light output of the lamp is controlled by a remote source. The ballast output voltage is regulated by a voltage control feedback loop, the dimming function being achieved by varying the set point of the control loop. The remote control signal, coded by interrupting the current flow to the ballast for a short period, is processed digitally by a microcomputer which generates information to vary the control set point. Circuit means are provided to control the filament voltage of the fluorescent lamps such that as the lamps are dimmed down, the filament voltage is maintained or slightly increased, thus prolonging lamp life and stabilizing the lamp light output.

REFERENCES:
patent: 4215276 (1980-07-01), Janeway
patent: 4370600 (1983-01-01), Zansky
patent: 4388563 (1983-06-01), Hyltin
patent: 4388567 (1983-06-01), Yamazaki et al.
patent: 4392087 (1983-07-01), Zansky
patent: 4523128 (1985-06-01), Stamm et al.
patent: 4866350 (1989-09-01), Counts
patent: 4904906 (1990-02-01), Atherton et al.

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