Twilight light control switch circuit

Published:2011/5/18 19:50:00 Author:John | Keyword: light control switch | From:SeekIC

This switch takes action within the above or below of a certain illumination. The typical application is the automatic switch for the early morning and evening lights. Figure (a) and (b) show the circuits which adopt two cadmium iodide photosensitive electric resistors with RPY20 . And the resistors are all directly powered by alternating current. 1KΩ resistance is used to reduce current ripple. And the resistance of relay coil is 21.8Ω. The pull-in voltage is 45V and the release voltage is 18V. And the contacted electrolytic capacitors cooperate to constitute the RC of 0.1S. Such is to reduce the short light flashes, to smooth output DC voltage of the diode rectifier and to prevent fibrillation of the relay.



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