# Inverter Design 12v to 400v 800w

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#### mostafa_gordy

Joined Feb 28, 2012
57
Hi
this below image attached is my circuit For inverting 12v to 400v low frequency iron transformer .
my citcuit worked and converting 12 volt car battry to 420v but low amper in side 400v and mosfets Do not Heat without heatsink .
my Goal is at least 2Amp at 400v (800w ) Please guide me to COMPLETE this Circuit !

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#### shortbus

Joined Sep 30, 2009
10,044
A step up transformer lower's the amperage as it raises the voltage. So to get more amperage out of you secondary you need to put more amperage into the primary.

#### mostafa_gordy

Joined Feb 28, 2012
57
I forgetting Add grounds for Mosfet in my Drawing but circuit is includeing
the grounds .
I do not KNOW my Transformer power Rating . Im find this Transformer
in around Timeworn tools market .
I CHANGE the PRIMARY wires and add center tape and increase the wire gauge
Picture of that Transformer is Below.
I "m connect 8uf (660v ac voltage ) to Voltage Doubler ac 220v mains (below image attached)
and discharge sound louder 40uf chraged Capacitor at inverteing 12v to 400v circuit ?
why? sinwave wave AC mains & inverter square wave?
I can Measure square wave with Voltmeter is ture?
sorry My English Language is not good.

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#### R!f@@

Joined Apr 2, 2009
9,916
If u are planning to use it as an inverter, it won't work.

#### mostafa_gordy

Joined Feb 28, 2012
57
Why Do not mosfet heating (PRIMARY Transformer Resistence = 0.3 ohm)(12/0.3=40 AMPER ! ). Driver of Mosfets is Ture ? Amplifier of signal is impotant or no important . I Makeing newTansformer ( PRIMARY wires = 1.5mm) What is out put Current at 12v of 4047 IC ? replacing of Mosfet with BJT or IGBT IS HELPING?

#### Audioguru

Joined Dec 20, 2007
11,248
Your little transformer is the size of a 20W one, not 800W. Its core will saturate at high power.

Texas Instruments has current graphs on their datasheets of Cmos logic ICs. Their datasheet for the CD4047 shows a typical output current of 9mA with a 2V loss when the supply is 12V.

Your voltmeter must be a "True RMS" type to measure a squarewave. It might be wrong at 200Hz.

#### mostafa_gordy

Joined Feb 28, 2012
57
Last edited:

#### Audioguru

Joined Dec 20, 2007
11,248
No.
A simple voltmeter is calibrated to measure the voltage a 50Hz or 60Hz sinewave, not a lower or higher frequency squarewave. Simply calculate the peak voltage instead.

I never heard of a "zvs converter". A full-wave rectifier produces half the ripple of a half-wave rectifier.

#### SgtWookie

Joined Jul 17, 2007
22,230
ZVS = Zero Volt Switching; this avoids power losses in the transistors/MOSFETs when turning them off.

Why do you need such a high voltage output, and at 800 Watts? I hope that you are aware that human contact with the output of the supply will most likely result in severe injury or death?

#### R!f@@

Joined Apr 2, 2009
9,916
OP is a n00b with a hopeless mission in his mind.
OP is trying to get power from batteries due to regular power cut. I would say OP is from somewhere in India. And he has little or no knowledge about power electronics.

After reading and seeing diagrams fro the net OP is thinking he can put together an inverter just like that.

Sigh ! Young minds on a venture.

#### mostafa_gordy

Joined Feb 28, 2012
57
OP is a n00b with a hopeless mission in his mind.
OP is trying to get power from batteries due to regular power cut. I would say OP is from somewhere in India. And he has little or no knowledge about power electronics.

After reading and seeing diagrams fro the net OP is thinking he can put together an inverter just like that.

Sigh ! Young minds on a venture.

#### praondevou

Joined Jul 9, 2011
2,942
What will this inverter be used for, i.e. what is the load?

What Rifaa means is that you some better planning to develop your inverter.

People spend years to develop a reliable product.

#### mostafa_gordy

Joined Feb 28, 2012
57
What will this inverter be used for, i.e. what is the load?

What Rifaa means is that you some better planning to develop your inverter.

People spend years to develop a reliable product.
For Continuous charge & Discharge 40uf Capacitor

#### praondevou

Joined Jul 9, 2011
2,942
Ok, I'm confused now.

In the first post you are talking about a square wave converter from 12V to 400V.

Then some posts later there is a 220VAC mains voltage doubler...

Where is the link between both?

If you just said what this project is for it may be easier to help you. Just charging and discharging a capacitor can't be the purpose.

#### mostafa_gordy

Joined Feb 28, 2012
57
Ok, I'm confused now.

In the first post you are talking about a square wave converter from 12V to 400V.

Then some posts later there is a 220VAC mains voltage doubler...

Where is the link between both?

If you just said what this project is for it may be easier to help you. Just charging and discharging a capacitor can't be the purpose.
FOR Plasma ARC Generation

#### R!f@@

Joined Apr 2, 2009
9,916
Well that was different !

#### mostafa_gordy

Joined Feb 28, 2012
57

#### shortbus

Joined Sep 30, 2009
10,044
FOR Plasma ARC Generation
Do you mean for a metal cutting plasma torch?

#### praondevou

Joined Jul 9, 2011
2,942
different?
The forum doesn't work very well if you post every time only a single word or phrase.

Also, It is not important to us what the final product will be.

Important is: Input/output voltages, frequencies, dynamic behaviour, etc of a circuit.

So again, what exactly do you want? An AC mains voltage doubler or a 12V to 400V converter? What output current?

#### mostafa_gordy

Joined Feb 28, 2012
57
Hello praondevou and shortbus Senior Members .
in past I tell the sound discrepancy of (8uf cap charged by An AC mains voltage doubler ) against (40 uf charged cap by my inverter 12 to 400v circuit) .
Do not any linkage of two circuit !
Finaly, I'm useing this inverter for drastic plasma Ignition kit in automotive engines.
( Plasma+CDI )

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