The switching circuit with self-hold function

Published:2011/6/20 8:51:00 Author:Nancy | Keyword: self-hold function, switching circuit | From:SeekIC

The switching circuit with self-hold function is shown as above. The three photocouplers serve as trigger, self-hold and switch respectively. When there is a start trigger signal added to GY, GG1 conducts, the GY2 and GY3 glow with current flowing through to make GG2 and OG3 conduct. When the trigger signal disappears, GY1 doesn't glow to make GG1 cut off, but GG2 has been conducted, the current of GY2 and GY3 is provided by GG2 path, which is equivalent to saying that the switch continues to connect and the circuit can't recover until the power supply E disappears.



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