Constructing an inverter

I think you will be out of your depth with this project....

An invertor is cheap enough to buy why re-invent the wheel?

John.

Insactly !

Unless of course you want weeks of frustration blown transistors/fuses/ICs/circuit tracks.

Mind if you do it and succeed you will learn a lot... but I wouldn't do it and I design electronics for a living...

http://zoomici.com/v2/portail/index.php?service=shop&c_un_choix=&PHPSESSID=fc3413a9bbcb34fa13c8b5f698e459d7&prod=112483&cat_mere=&le_num=7408&num_cat=7409&num_cat_mere=7408&nom_cat=Inverter&cat_prod=

Priced at €96.51 (£67.34) retail on 20/9/07. There might be some post and packing on top of that value.

Go to Radio Shack or similar and buy a cheap one - then reverse engineer it. The simplest inverters Are just square-wave oscillators; a high frequency one with a ferrite transformer to step the voltage up, a diode pair or bridge to convert it to DC and charge a capacitor, then a 50 or 60Hz output oscillator.

By "inverter" do you mean something that takes in DC and produces AC at 50 to 60 Hz? If so that's a fairly advanced project. However, since it's combined with "battery protection" it may mean something different to what you're asking. Can you give us more details. Jeff

Where are you located?

Also could you please join CR4 and give yourself a Nom de Plume first?

Otherwise we will no be able to sort the guests from the guests!!!! and I for one will not add any further infos........what a wonderful idea you say immediately!

Possibility one:

You want it for hobby-/home-purpose. Then follow the answers you already got and buy one.

Possibility two:

Its your task as a student to design one. Then follow your task and don`t ask others who have made their stony way, too.

Good luck, Uwe

all kinds of plans on the internet FREE!!! best way to learn..I bet less than 10 % of graduates can even build a circuit board... sham on them. they no enginer

If you have to design it yourself, first buy a 12/12 volt to 230 volt (or 115 volt depending on your location!) transformer.

Take an NE555 or similar and produce either a 50 or 60 hz stabile frequency generator.

With the output of the NE555 switch two MOSFETS to drive the battery voltage alternately through one 12 volt winding, then the other, in opposition to each other, so that you get AC and not just "lumpy" DC.....

The rest is up to you!!!

Remember that the output can kill you!!!

Hey, that's a good idea - but you should explain that the transformer is acting as a filter to smooth the square wave into an approximation of a sine wave.

Dick

Dick and Andy, if you need a hi quality frequency-stable output with less harmonics then take 4 Mosfets and give each of them a different current (binary weighted) and drawn through the transformer. Control them by a frequency controlled up-down-counter. Up=1/4 period, Down=1/4 period, the current for the second half has to be inverted. So you get a staircase-sinus with 64 steps leading to very low harmonics - low enougt to supply even sensitive devices which normally need real sinus-shaped power supply.

Regards Uwe

Thats sounds like a great idea, but probably too complicated for our Blogger....though he should answer for himself....

It will get a lot warmer than my design ideas and as someone else mentioned, (because I forgot) it gives a close approximation to a sine wave due to the Transformer's inductance - eg. Near enough for Government Work!!

Your idea, using a PIC controller would be nice....

I did that about 30 years ago to produce crystal-accuracy frequencies of audio sine-waves for hearing testing. After the step functions were passed through LC resonant filters, it produced very clean sine waves!

Dick

Most electrical equipment is not so fussy about the shape of the sine wave, nice to have but not essential!!

Right. Ive run my laptop power supply a number of times in my car with a cheap Radio Shack inverter whose output is essentially a square wave.

Guest ,

you are first year student and tring to built a project? that is suppose should be learnt by the end of third year atleast , you become familiar with most of knowhows by then with respect the project you mention , i suppose you are a engineering student .500va is readily available in the market , you to get ready kits available for building by your own supported by circuit diagram and check points , but to know from there you will have to complete your educational course