Light quantity control device

Details Light quantity control device Light quantity control device

1982-05-07

1983-11-22

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250205, 250214L, 315156, 315158, 315199, H05B 3702

Patent

active

044171790

ABSTRACT:
A light quantity control device for controlling the quantity of light emitted from a light source supplied with a.c. power through a bidirectional switching element is disclosed which comprises an integrating circuit for integrating an electric signal corresponding to the quantity of emitted light to produce a light quantity signal varying in accordance with a change in quantity of emitted light and another integrating circuit for integrating the light quantity signal with a predetermined period to produce an exponentially rising signal for every predetermined period, and in which the output of the latter integrating circuit is compared with a reference value to obtain a control signal having a duration time corresponding to the results of comparison, and the switching element is controlled by the control signal to perform a phase control for the a.c. power.

REFERENCES:
patent: 3670202 (1972-06-01), Paine et al.
patent: 4190795 (1980-02-01), Schultheis
patent: 4203032 (1980-05-01), Haunstetter et al.

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