Steam iron automatic protection circuit diagram

Published:2011/8/4 5:08:00 Author:Rebekka | Keyword: Steam iron, automatic protection | From:SeekIC

The circuit is shown as above, the commercial power passes C5, R7, R8 buck, VD7 ~ VDl0 commutating and VD11 regulator. The circuit provides operating voltage. When the iron is put horizontally, the mercury switch S downward about 15o and in a disconnected state. At this time, IC1-a outputs low level, C1 is charged by R2, ICl-c outputs low level, ICl-d has outputs low, VD3, VD4, IC1-e form NAND gate output high level, VT2 is turned on, relay Jl pulls in, then heating wire is heating, H neon lights are lit.



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