Simple 100W Inverter Circuit USing MOSFETs

A power inverter or inverter is basically an electronic device or circuitry that changes dc (direct current)  to AC (alternating current).
The frequency, input voltage, output voltage and overall power handling depend on the design of the specific device or circuitry. No Power is produced by it, the power is provided by the DC Battery source. Inverter is also known as UPS(uninterruptible power supply). A inverter can be modified to a UPS by adjusting some relays.
Today we are going to know about making of an Inverter. It can be any ratting. I am designing for 100W Inverter.

inverter of 100W:

Componants used in making of an inverter:

• Transformer 40 amps, 220 , (100 W)  (stepup)
• Ic CD4047- click here to download datasheet.
• Mosfet IRF540 Click Here to download DataSheet 
• Capacitor= 0.01uf, 220uf
• battery= 12v ,40A
• wires, soldering iron and wire.

Circuit Diagram:

Expalantion:

The inverter circuit is built around IC CD4047 which is wired as astable multivibrator.Dc supply is given to the Mosfets and mosfets convert that dc supply to Ac. The controlling factor is gate pulse which will be generated using 4047IC. The operating frequency of astable multivibrator is set to 50Hz. The values of Resistor and capacitor can be find fo 50Hz frequency by using below formula:
f=1/4.4RC

The pin number 5 and 4 of cd4047 are of Astable and Complement Astable. IC CD4047 will work in the astable multivibrator mode. To work it in this mode we need an external capacitor between the pin1 and pin3, whereas Pin2 is connected by a variable resistor to change the output frequency of the IC.The pins 10 and 11 are connected to the gate of the IRF540. The pins 10, 11 are Q and its Complement, from these pins the output frequencies is generated with 50% duty cycle.

The output frequency from CD4047 is then  connected to the mosfets through resistor. this resistor will helps in preventing the loading of mosfets. The main AC current is generated by the two mosfets which will act as a two electronic switches( which turns on and OFF by the pulses comming at the gate from CD-4047 mosfet). when the pin 10 becomes high Then the current from battery flows in the upper half of the primary coil of transformer through Q1 Mosfet, and when pin 11 is high then the current from battery flows in the lower half of the primary coil of transformer through Q2 Mosfet. By this switching the two mosfets current is generated.

This AC is then given to the transformer. From step up transformer we will get the max voltage i.e. 220v. Capacitor is used to stablize the output.

The Capacitor accross the battery is used for avoiding the Fluctuation in the supply voltage.

NOTE: The generated AC is not equal to the normal AC and You cannot use this voltage for pure electric appliances like electric cooker, heater etc. Because the fast switching of mosfets dissipates a heat which will effect the efficiency. You can use heat sink to remove this problem.