Electronics > Beginners
Heavy duty AC to DC converter required
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mche1997:
Hello Oldways
Had a look at the transformers and you stated best to use the isolated transformer, would it be the yellow bucket type ones like the ones attached here
oldway:
About Brown's gas....

oldway:
As it happens too often on this forum, you neglected to provide essential informations.
This has a direct impact on the answers you are given.

Initially, it appeared that the ac / dc converter was to be used for experimental purposes and at minimum cost.

Much later, you revealed to us that this is probably a commercial product that you intend to build in multiple copies ....

This totally changes the problem.

Indeed, if for experimental purposes, we can not respect the standards and regulations, this is no longer the case when it comes to a commercial product.
The DIY solution of transformers with variac does not meet European standards for power factor.

It can not be applied to a commercial product.

You will have to look for a commercial  switching power supply with  PFC adjustable from 200 to 350V 12A that will meet the standards and regulations.
tron9000:
what was your budget again?

I just did some finger in the air pricing for just the bare simple system (transformers + rectifier, simple meter for voltage, enclosure, connectors and circuit portection) and for you to buy it off someone (qualified) you'd be looking at a couple of thousand just for the prototype you described, that includes the labour, testing and shipping....if your lucky

Those transformers (also called site transformers - cos they're used on building sites) are £240 (inc VAT) each. There's nearly 1/3 my estimate there.


--- Quote from: mche1997 on April 23, 2018, 07:33:17 pm ---I don't think I would ever run it to 16 amps, maybe near 13 max but most times I would like to run it between 8 to 12, thats why I wanted something to control the current.

--- End quote ---
Add in some sort of current control circuitry and it goes up again.


--- Quote from: oldway on April 24, 2018, 08:35:57 am ---
Much later, you revealed to us that this is probably a commercial product that you intend to build in multiple copies ....

This totally changes the problem.

Indeed, if for experimental purposes, we can not respect the standards and regulations, this is no longer the case when it comes to a commercial product.
The DIY solution of transformers with variac does not meet European standards for power factor.

It can not be applied to a commercial product.


--- End quote ---

Compliance testing - price goes up again...CONSIDERABLY! Test houses charge quite a bit. So more pretesting to make sure you're not going overrun your allotted time at test house, cos that'll cost more too.

we'd really need to know a budget....what can you afford?
mche1997:
OMG ! thousands, my budget is only just up to £200. Only a converter with 240Vac in and 300vdc out.
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