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Optocoupler_driven_SCR

2014-11-26 17:34  
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Optocoupler_driven_SCR
This circuit shows a 4N26 driving an SCR, which, in turn, is used to control an inductive load. The SCR is a sensitive-gate device ( 1 mA of gate current) and the 4N26 has a minimum-current transfer ratio of 0.2, so the 4N26 input current (IF) must be 5 mA. The 1-kΩ resistor prevents the SCR from triggering with small input changes, and the 1N4005 prevents the SCR from triggering with the self-induced voltage when the SCR turns off.