Automatically reset earth leakage protector circuit composed of NE555

Published:2011/8/4 20:03:00 Author:Rebekka | Keyword: earth leakage protector | From:SeekIC

Signal detection circuit is the zero sequence current transformer composed of L1, L2, L3 and the magnetic core. Under normal circumstances, the total magnetic flux in the transformer is 0. When someone is shocked by the electric, the power supply passes the body to the ground, the current flowing of L1, L2 are different. Zero-sequence transformer in the magnetic flux induced in the L3 has an alternating voltage, and it is rectified by D1 and added to BG's base, so that BG saturated conduction, and 555 feet ois set because of potential ② low (<1 / 3VDo).



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