The relay low-power maintenance

Published:2011/7/21 1:59:00 Author:Seven | Keyword: low-power, maintenance circuit | From:SeekIC

The pulling in current of the relay is high that its releasing current, when the relay pulls in, the relay will working while keeping the state. See as the figure, the circuit can make the relay working in a low current after it pulls in, so the power consumption is reduced. When the 3-pin of 555 is turned into the high LEV from the low, as the voltage on C can't mutate, so the input current that VT acquires is (VA-0.7V)/R2. After that, C is charged by R2 and eb Knot, VB is falling down, when C is full, VB=VA-Vc.



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