elaborately improved fan speed control circuit

Published:2011/7/5 10:17:00 Author:John | Keyword: fan | From:SeekIC

As shown in the circuit, capacitor C is generally used in 2.5 ~ 4.7μF/400V. Both ends of the C are connected with a switch S in parallel. When the S is closed, C is short and the fan operates according to the governor SA’s original gear operation. When S is turned off, the C is applied into the circuit in series. Due to its capacitance, the speed of fan motor M is reduced although governor SA’s gear operation is not changed. However, the wind speed is lower than the original one. H is a light of 8 ~ 10W. It can work as a light in a weak windshield, as well as providing a discharge path for capacitor C when the city power is cut.



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