Published:2011/8/24 21:25:00 Author:Christina | Keyword: Household, automatic, hand dryer | From:SeekIC
The household automatic hand dryer circuit is as shown in figure (a), it is composed of the infrared reflection switch A1, the AC SSR A2, the hair dryer and the power conversion circuit. After you open the power, the A1 outputs the infrared ray. Because there is no object to reflect the infrared ray, so the OUT port of A1 outputs the low level, the VT cuts off, also the A2, the hair dryer which is connected with the socket XS will not operate. When the hand is below the hand dryer, the infrared ray is reflected by the hand, the OUT port of A1 outputs the high level signal, the VT conducts.
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