Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...
Patent
1994-10-07
1997-04-08
Pascal, Robert
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Electric switch controlled by the radiant energy responsive...
315DIG7, 315209R, 315225, 315307, H05B 3700
Patent
active
056191049
ABSTRACT:
An automatic illumination intensity control apparatus for a discharge lamp includes a chopper circuit for stepping up D.C. voltage obtained by rectifying commercial A.C. voltage, an invertor circuit for converting D.C. voltage output from the chopper circuit into an A.C. voltage with a higher frequency to drive the discharge lamp, a brightness level sensing portion for sensing the brightness level of the area to be illuminated, a brightness level setting portion for setting brightness level of the area to be illuminated, and a power cut-off portion for stopping the operation of the invertor circuit when the sensed brightness level is greater than the set brightness level. The control apparatus may further include an illumination intensity adjusting portion for varying voltage output from the chopper circuit in proportion to the difference between the set brightness and sensed brightness when the sensed brightness is less than the set brightness. The control apparatus may further include an overcurrent preventing portion for automatically stopping the operation of the invertor circuit when the current value flowing through the discharge lamp is greater than a reference current value.
REFERENCES:
patent: 2967981 (1961-01-01), Wise
patent: 3483428 (1969-12-01), La Plante
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
patent: 4412154 (1983-10-01), Klein
patent: 4523131 (1985-06-01), Zansky
patent: 4998046 (1991-03-01), Lester
Pascal Robert
Samsung Electronics Co,. Ltd.
Shingleton Michael B.
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