Analysing Kewei Home-Use Hand Drier Circuit

Published:2011/7/29 7:32:00 Author:Robert | Keyword: Analysing, Kewei, Home-Use, Hand Drier | From:SeekIC

The analysis of hand drier circuit's woking principle.The PCB is the main component of the Kewei hand drier. The author has drew this hand drier's full circuit according to the physical PCB, which is shown in picture 1. And the author has also drew this hand drier's working principle diagram by analysing the circuit in picture 1, which is shown in picture 2.1.The power supply circuit.The Kewei hand drier's power supply uses the commercial power 220V as its power supply. The voltage, which the circuit needs, is the DC low voltage (9V). It firstly uses the capacitor C1 to current limiting and voltage step-down. And then it is rectified by diodes D1~D4 and filtered by the electrolytic capacitor C3. At last it would be regulated by the voltage regulator tube Z1. Then it would output the Vcc (9V) DC voltage to supply the hand drier's each part's power. It is added a capacitor C2, C4 for high-frequency pulses filter and a voltage varistor D5 for peak pulse spike limiting in the power loop circuit.



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