Device for controlling the light intensity of a fluorescent tube

Details Device for controlling the light intensity of a fluorescent tube Device for controlling the light intensity of a fluorescent tube

1984-11-27

1985-07-16

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315291, 315DIG4, 315DIG7, H05B 3702

Patent

active

045299137

ABSTRACT:
A device for controlling the luminous intensity of a fluorescent tube supplied with a direct voltage comprises a stabilized supply, a ramp generator, a modulator receiving the ramp signal responsive to a control means sending thereto a voltage for generating a chopped signal whose chopping rate is determined by the control means. The signal is sent to the converter of the tube through an interface circuit. The device is applicable to the regulation of the intensity of tubes on an airship, automobile or portable lamp.

REFERENCES:
patent: 3890537 (1975-06-01), Park et al.
patent: 4039897 (1977-08-01), Dragoset
patent: 4170747 (1979-10-01), Holmes
patent: 4219760 (1980-08-01), Ferro
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
patent: 4346332 (1982-08-01), Walden
patent: 4492899 (1985-01-01), Martin

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