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Solid State dark activated Relay circuits

2017-08-16 07:32  
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Solid state relay is similar to the opto coupled devices already mentioned, but using powerMOSFETtransitors as the switching device. Solid State Relays (SSRs) can replace many types of low power electromechanical relays.This dark-activated relay switch can be used to turn on walkway or other outdoor lighting at dusk. By using alternate connections to A and B, increasing illumination,high and low temperatures can be sensed. Solid state relay uses opto−coupling to provide complete electrical isolation between its low power input circuit and its high power output circuit. When the output switch is "open" (MOSFETs off) it has a nearly infinite resistance, and a very low resistance when "closed" (MOSFETs conducting heavily). It can also be used to switch either AC or DC currents.
 

Solid State Relay circuits