Small Wind Turbine for Home

Electrical Energy is essential to every one, we trying to get unlimited electrical energy without spending money, Here is the simple design proposed as small wind turbine for home use or low power usage, it requires low initial cost and gives best return in terms of electrical energy.

We can use this small wind turbine circuit and setup to charge the laptop, to charge electronic gadgets or to electronic appliances in home and outstations.

Design of Windmill generator

Small 12V wind turbine generator is capable of producing alternate energy through wind, the Bridge rectifier and controller rectifies the energy came from wind turbine generator and regulator-battery charger circuit helps 12V/4.5Ah SLA battery to get charging, then Step-up inverter circuit produce high voltage AC enough to operate home appliances.

Circuit Diagram-Wind Turbine Generator 

Construction & Working

This small wind turbine circuit constructed as five stages they are,

  1. 12V Wind turbine generator/Bridge Rectifier Circuit
  2. Regulator / Battery charger circuit
  3. Inverter circuit using IC CD4047
  4. mosFET Drivers
  5. Output Stage

12V Wind Turbine Generator

12 Volt wind turbine or windmill available with different watts range, choose depends on your requirement.

Bridge Rectifier

We know the bridge rectifier converts AC supply into DC and here we used 1N4007 diode as a bridge rectifier element, it converts the energy from wind turbine into Direct Current (DC) supply.

Regulator / Battery Charger

The LM317 adjustable three terminal Positive voltage Regulator used here and it can give output voltage range from 1.25 V to 37 V with more than 1.5A current rating. final output from the regulator is given to 12/4.5Ah SLA Battery, this Battery provides DC bias to the inverter circuit. Regulator LM317 output voltage Vout can be obtained as

lm317 output

R2 => R2+VR1 for given inverter circuit.

Inverter Circuit using IC CD4047 (Switching Pulse Oscillator)

Monostable / Astable multivibrator  IC CD4047 used here to produce switching pulse, This IC works in low power and available in 14 pin Dual in line package. It provides full Oscillation output F at Pin 13, 1/2 of oscillation at Pin 10 as Q and Pin 11 as Q’. each output pin gives 50% duty cycle.

cd4047 f output formula

Here R => R4+VR2 and C=> C3. by using this formula we can obtain frequency output at pin 13. For pin 10 and 11 the formula changes as f=1/4.4RC.

MosFET drivers

IRF540 N Channel power mosfet from vishay siliconix used as a switching drivers for this inverter circuit. It gives fast switching, and have high operating temperature characteristics (175ºC).

Output Stage

Main part of wind turbine generator is output stage, here transformer X1 is used in reverse with specifications as 230V primary, 9V-0-9V / 1.5A secondary winding center tapped transformer. MOV (Metal oxide Varistor) protects electronic device connected at output.

Wind turbine generator output voltage is directly fed into LM317 positive Regulator circuit and it is adjusted to give 12 volt output and Battery connected to this bias through (3A, 50V) Schottky diode.

The CD4047 IC is connected and configured as Astable multivibrator, When we turn ON SPST switch this circuit starts oscillation. Output Q and Q’ are directly fed into switching power mosfet IRF540 & drives X1 transformer secondary winding, here the current flow occurs particular duration and not for particular duration. So varying electromagnet induced and primary winding coil produce EMF, hence we get Alternating current output. Depends on the count of winding and switching frequency output Voltage/Frequency get varied.


* High voltage caution! This Circuit Involves in operating High voltage handle with extreme care.

* Handle the Wind Turbine Generator and Rotor blade as per the Instructions given by manufacturer. 




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