Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1989-05-30
1990-02-20
Yusko, Donald J.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315154, 315199, 315209R, 315DIG5, 355 68, 355 69, H05B 4136
Patent
active
049029363
ABSTRACT:
A light adjusting apparatus comprising a lamp connected to a commercial a.c. power supply via a triac, and a switching control circuit operable by a direct current obtained by directly rectifying the current of the power supply for controlling the conduction timing of the triac based on the zero-cross timing of the power supply. The conduction timing of the triac is controlled by a signal obtained by producing a pulse-width modulated light adjusting signal from a signal generating circuit by a light-emitting element, causing a photodetector in the control circuit to receive the adjusting signal and subjecting the resulting output of the control circuit to pulse-width demodulation.
REFERENCES:
patent: 3996494 (1976-12-01), Suga
patent: 4331914 (1982-05-01), Huber
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 4463284 (1984-07-01), Tamura
patent: 4624547 (1986-11-01), Endo
Palladino Brian
Sharp Kabushiki Kaisha
Yusko Donald J.
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