Fan speed controller diagram 1

Published:2011/6/27 20:25:00 Author:Nora | Keyword: Fan , speed , controller | From:SeekIC

Step-down power supply circuit consists of the capacitor Cl, rectifier diodes VDl, VD2, filter capacitor C2, the power indicator light-emitting diode composed of VL and VS regulator diode.Controlled oscillator consists of a time-base integrated circuit IC, resistors RI, R2, capacitors C3, potentiometer RP and diode VD3, VD4 formed.Control implementation of the circuit consists of the fan motor M, thyristor VT, resistor R3 and the first 3 feet inside the IC circuit.AC 220V voltage buck by Cl, VDl and VD2 rectified, VL and VS filtered and C2 regulated, the IC provides about 8V DC voltage.Controlled oscillator work, a 3-pin output from the IC cycle 105, the duty cycle adjustable oscillating pulse signal, the use of this pulse signal to control the conduction status of thyristor VT.Adjust the resistance of RP, you can change the pulse duty cycle (adjustment range of 1% -99%), control the level of the fan motor M speed, resulting in simulated natural wind (gusts period of 10s).Change the capacitance of C3, can change the oscillator weeks moon, thus changing the simulation of natural wind cycle.



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