[SOLVED] SWITCH MODE ARC INVERTER WELDER SCHEMATIC

welder schematics

ibersoy2006 said:

i need switdh mode arc welder machine use microcontroller type number and datasheet

Added after 4 minutes:

i need to invertor sudura.pdf of the use microcontroller type number it did not write shematic diagram you give microcontoller type number i be very happy
thanks

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i really don`n know. i have the document "as it is"

Did anyone get any further with this idea?

Hello

I have a question

usually in SMPS like the ones above, or close to, like those in the audio amplifiers

when you short output of that smps it will blow up.

welding machiens, wont blow up at short circuit.


why?

This is because the load current is automatically limited to the range required welding process, by its control circuits.

to build a welder u could use PULSE WIDTH MODULATION circuit to control a mosfet which switches a step down transformer on and off

---------- Post added at 20:27 ---------- Previous post was at 20:23 ----------

if the inverter circuit is difficult to find then one must go with a MOT WELDER.
IT IS SIMPLE AND ALMOST FREE.

Picture with board? We try to build this board and we need this picture to draw on board and put tih in corrode bath.
Thanks.

I m alone?

Hi,

I have a problem with my inverter welder. SMPS for pwm was burn. can you help me to find schematic of porto welding machine pd85 series.

Thank so much.

regard

IB

perhaps it is useful to someone

Congrats on that circuit.
I gave up on my idea and bought a chinese new one, they are so cheap its not worth plugging the soldering iron in.
I did however get a mobile version working using an alternator.
Your circuit design uses some good lateral thinking, controlling the ac going into a switcher is a great idea and keeps the control circuit simple.
Your putting the array of 1u's under a fair bit of stress, you'd need some good quality caps to make the circuit reliable.

Your putting the array of 1u's under a fair bit of stress, you'd need some good quality caps to make the circuit reliable.

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It so. I have been using capacitors K78-2, you will certainly easier to use Wima MKP.

In comparison with factory devices it has a feature - 100V standby output.
А bit dangerous, but all the electrodes are lit like matches.

The ferrite core of the transformer is taken from TV CRT deflection system.

Good innit, tv output cores can take that much wack, I remember seeing something on youtube where a power source could melt a 4" nail from a telly output tranny.
My inverter weld set has adjustable off load voltage, doesnt go quite that high, but I think about 70v is possible, which is about the same as a professional ac weld set.
You did well to get that to work, every time I do something power wise esp with mosfets I end up with a load of them blown to bits before the thing works.
I like the simplicity of the circuit, I'll save this one for future reference, might be usefull for a 12v regulated transmitter supply.

blown to bits before the thing works

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I have lost several transistors in process of the debugging the scheme, too.

Unless no needs big power, certainly possible do more simply..
here is for instance scheme, used as power supply for my old cordless drill

Love it, exactly the sort of stuff I get up to.
You like the international 2163 then.
Does this design use a TV lopt as well then?, how did you design the core and work out the frequency, did you measure the A/L factor of the ferrite then test the saturation point with a test jig?
I did a project a while back a pocket led torch, proved to be really usefull, I made the transformeer out of an if tuning transformer from a reciever, I meaured the A/L factor, and the saturation density and desgined a simple blocking oscillator around it, the circuit only uses one low saturation resistance transistor and a few passives, (ok the lower photo has 2 leds and uses an old choke instead of a if transformer but the principle is the same) here:

**broken link removed**

**broken link removed**

I have simply collected in one designs several ingenious decisions, not being big specialist in the field of pulsed converters )

I think, possible use any suitable on size and quality ferrite core. Including tv lopt, if pack together three pieces (on one possible do realy that device for joining a welding copper wire - this welding device was conceived as device for welding wire).
Preliminary calculation of the transformer was made by means of free program "Lite-CalcIT" and similar "Design tools pulse transformers 4".
In television set is used high-quality ferrite so border of the saturation is found where that on 15 whorls in primary windings, under nominal voltage and absence of the load. Thereby amount at 30 whorls is chose from considerations of the restriction of the maximum current and making the heavy stocks on saturation.
Welding device more rough device, than driver of the led and border of core saturation easy define on current without load and temperature of the transformer. Only, it is necessary to use resistor (powerful light bulb) or lowerring transformer for feeding the device for time of the experiment.
But measure the A/L factor of the ferrite then test the saturation point with a test jig certainly is a most correct way.

My technique I thought was more of a 'back yard' example, I tend to keep pcb's from scrap equipment, therefore ferrite cores and the like Iuse tend to have zero data so doing a measurment is the only way.
Blocking oscillators are interesting devices when it comes to calculation, I can see why they are little used in production.
I'd like to build a circuit that can measure losses with frequency.

at least components from scrap equipment not forged, quite often even better than that possible to buy in shop.
For manufacturer certainly more suitable microcontrollers with onboard secret program ).

DeepOne said:

perhaps it is useful to someone...

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Schematic diagram of your welding machine has no any feedback. It's a joke? :roll:

It's a joke?

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No, in this schematic restriction of the welding current occurs due to capacitive resistance of half-bridge capacitors.
Apropos, here is similar device for welding copper wire and thermocouples.