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Has anyone built an efficient rectifier before, from 220-230V AC to 12V DC as well as a 12V DC to 220-230V AC inverter? Answered

I want to build a DC-AC inverter / AC-DC rectifying system. I want my inverter to convert 12V DC to 220V AC as efficient as possible and without to many components because i want to host my rectifying system in the same box as my inverter. my question is who has designed this two systems before separately of course with the least components and had an efficiency higher then 85%?

Discussions

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steveastrouk

3 years ago

As Iceng makes clear, its a major project, and one which, in fairness, if you have to ask how, you probably can't

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FransNsteveastrouk

Answer 3 years ago

I have already built a power supply. 220V AC to 5V and 15V DC it was a variable power supply. So I have the experience.

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steveastroukFransN

Answer 3 years ago

With a transformer and a regulator ? Or an off the shelf switching regulator ?
Building a mains switcher is NOTHING like it

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icengFransN

Answer 3 years ago

ok

Some math first an RMS of 230 vac will need semiconductors capable of withstanding a peak voltage 1.414 greater => 326 volts plus a safety factor puts you into a minimum of 400 volt components on the high side....

A 12vdc 500 watt inverter will draw 42 amps and 85% efficiency will make that 50 amps dc from a battery or car alternator...

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icengiceng

Answer 3 years ago

Next some kind of inductor / transformer needs to match the high frequency of the semiconductors. As frequency goes up the magnetic weight goes down BUT the switching semiconductor power dissipation starts to rise needing more cooling heat sink weight....

Are you into winding your own xfmrs to use the best grain oriented tape wound magnetic toroidal transformer or do you plan to buy one, which would lock you into a design ?

We will talk more about more about removing the (Bad) third harmonic with a 6 step waveform later.

If weight is no concern a cleaver design can use a single xfmr for both features...

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iceng

3 years ago

What is your skill set ? What have you built over 25 watts.

This is a Major project you are contemplating.

If you are a first time builder, please please try a small kit inverter first.

Or you will waste your money and time for failure.

If you want to learn how. Buy a small inverter, take it apart, learn how it works,

see the heat sinking technique, and put it back together.

When it works again ! then you will be ready :-)

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verence

3 years ago

Well, UPS manufacturers do that for a living...

It would help to know how much power you need. Are we talking mW, W, kW, MW?

How good has the waveform to be? Is rectangular good enough? Trapezoidal? Pure sine?

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FransNverence

Answer 3 years ago

I want about 500W and I want a pure sine. I know I can buy one but I just want to build one myself.