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12 V DC to 220 V AC Inverter


Now a days when electricity is getting expensive and at some remote areas it is totally not available. This simple circuit is the answer to the problem.

R1 and R2 are of 10 ohm, wire-wound and at least 5 watts. Cooling should be increased if you decide to beef up output. For D1 and D2 any power diode can be used.

The 68uf Tantalum capacitors were chosen for their endurance). electrolytic capacitor would over heat and explode.

The power is determined by the transformer (T1) and power transistors Q1 and Q2. Assume a transformer of about 15A and the chosen transistors 2N3055 (15A) type, the inverter can supply about 300 Watts with the parts in this circuit.

If you are good with electronics all you have to replace transformer accordingly for more output. NTE 181 Transistors can be used as it carries 90 volts and dissipate power 200W. It is mandatory to mount power transistors to proper heat sink plate and add a cooling fan.

You should include fuse to both stages (input and output) and project should be completed with proper casing and it would be good to have a cooling fan in casing.

I made it on small PCB by heavy prints with 1 A general 220 to 12 V step down transformer. During testing circuit worked OK at 100-150 watts load :)

Photos would be uploaded soon....









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