SYNCHRONOUS_PHOTOELECTRIC_SWITCH

Published:2009/7/1 1:43:00 Author:May | From:SeekIC

Synchronous switching is turning on only at the instant the ac supply voltage passes through zero, and turning off only when ctyrent passes through zero. This circuit provides this function in response to either a mechanical switch or a variable resistance such as a cadmium-sulfide photocell. This circuit produces the minimum disturbance to the power supply when switching, and always conducts an integral number of whole cycles. It is ideal for use wherever RFI and audio filtering is undesirable, where magnetizing inrush current of transformers causes nuisance fuse-blowing, and where sensitive equipment must operate in the vicinity of power switches.



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