[Elettronica] 12Vdc To 120 220 Inverter

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12VDC to 120/220VAC Inverter

This inverter will sufficiently power any of your 115VAC (or 220VAC) small
appliances. T1 choice of amperage is yours to make, but if you can salvage a
heavy-duty unit from somewhere, use it. The least expensive method to get a
larger transformer would be to remove the old 2000v primary and then re-wind
an old microwave transformer. Most of these transformers are rated 1KW or
better. Your local TV or Electronics repair shop may have one or dig one up
from the dumpster. Just in case you don't know, micro-wave transformers can
keep their charge (via the connected electronics) for a long time, so be careful!
R1 and R2 are 10 ohm, wire-wound, and at least 5 watts. Wattage/cooling
should be increased accordingly if you decide to beef up the output. For D1 and
D2 you can use any power diode like the 1N4002 to 1N4005.

If you live in Europe, Australia, or any other country with a 220VAC system,
the only different is the transformer. This particular circuit can be constructed
to handle up to 1 KiloWatt (1000 watt). If there is enough interest, I can modify
this circuit to include a crow-bar circuit, battery backup, or more output in
watts, or everything.
The power output is determined by transformer T1, and power transistors Q1 &
Q2. Assume a transformer of about 15A and the chosen transistors of 2N3055
(15A) type, the inverter can supply about 300 watts with the parts shown. If
you are good with electronics all you have to do is replace the 2N3055's and T1
accordingly for more output. It is imperative to mount Q1 and Q2 on large
coolribs. If you intend to beef everything up with a couple kilowatts a standard

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(5") cooling fan will also be required. If this is the case, the 2N3771 power
transistor is a good choice at 30Amps. NTE's replacement, NTE181, is an
improved version of the 2N3771 and carries 90volts instead of the 40 volts and
can dissipate 200W instead of 2N3771's 150W.

It is mandatory to include at least one suitable fuse and enclose this project in
the correct casing. To be really safe you may want to include a primary and
secundary fuse for your own protection. You are dealing with 120VAC or
220VAC at respectible amperage so be careful. The powercord also needs to be
secured to prevent accidents.

The 68uF Tantalum capacitors were chosen for their endurance. Normal
electrolytic capacitors would overheat and explode. Somesort of cooling fan
inside the project case may be a good choice, I myself use a ball-bearing cpu-
fan from an old computer. New they don't cost that much either, about 3 bucks
or so.

Since T1, and Q1/Q2 are NOT part of the PCB, these few parts can easily be
used on a piece of Vero or experimenters board. Radio Shack and Tandy have
these boards also available at a very reasonable price (in Canada $3.50). The
receptacle(s) on T1's output will be part of the case (obviously). I Just a small
note about the 12 Volt battery, this circuit and others similar can draw huge

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amounts of current and will drain your battery in hurry so don't let your battery
go dead! That's why a wind/solar power combination would be an excellent
future addition. For those interested in a PCB, I have included one below with a
layout. As soon as I get my digital camera I will include pictures of the finished
project.


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