Dimmer circuit for fluorescent lamps

Details Dimmer circuit for fluorescent lamps Dimmer circuit for fluorescent lamps

1979-07-05

1981-08-25

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315DIG4, 315DIG5, 315291, 315297, H05B 3702, H05B 3904, H05B 4136

Patent

active

042861950

ABSTRACT:
A fluorescent lamp dimming circuit is disclosed for DC fluorescent lighting circuits of the type using a battery voltage source and an inverter. The dimming circuit comprises an electronic switch (24) connected between the battery (18) and the inverter (16) and an oscillator (26) is provided to periodically actuate the electronic switch to reduce the on-time of the lamp current. A timer (30) is connected with the oscillator (26) to disable the dimming circuit for a preset time interval after the lamp has been turned on by an on/off switch (20). Thus, the lamp is started at full intensity upon each start-up and after the time delay the dimmer circuit is effective to reduce the intensity.

REFERENCES:
patent: 3611024 (1971-10-01), Nakatsu et al.
patent: 3774074 (1973-11-01), Souvay
patent: 3927349 (1975-12-01), Suhren et al.
patent: 3935502 (1976-01-01), Herzog
patent: 3936696 (1976-02-01), Gray
patent: 3969652 (1976-07-01), Herzog
patent: 4170747 (1979-10-01), Holmes
patent: 4207498 (1980-06-01), Spira et al.

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