Published:2011/6/10 20:43:00 Author:qqtang | Keyword: switch circuit, self-lock | From:SeekIC
In the figure is a switch circuit with functions of self-lock (auto keeping). The 3 photoelectric couplers fulfill functions of trigger, self-lock and switch. When there are trigger signals on GYI, GG1 is conducting, GY2 and GY3 are glowing because of the currents in them, and GG2 and OG3 are conducting. When the trigger signals disappear, GY1 is put out and GG1 is blocked, but GG2 is conducting now, the currents of GY2 and GY3 are provided by GG2, GG3 remains in the conducting state, which is equal to switch going on conducting and the circuit won't recover until the power supply voltage E is gone.
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