How to create high current dc power supply from mains electrcity?

A

Aadil17992

New Member

• Nov 5, 2012

• #1

Please list the name of parts required as well as their specifications.

 

jpanhalt

Well-Known Member

Most Helpful Member

• Nov 5, 2012

• #2

It is all rigt here:**broken link removed**

Just click on specifications. This supply will provide both AC and DC. If you need more current, please let me know.

John

 

MikeMl

Well-Known Member

Most Helpful Member

• Nov 5, 2012

• #3

Put some effort into asking a better question!

Amps out? Volts out? Volts in? How good does the regulation need to be? What application? Linear or Switcher? (I go on for many lines...)

 

A

Aadil17992

New Member

• Nov 6, 2012

• #4

I would like achieve between 30 and 50 amps out. The voltage will depend on the transformer i can get. I would just like to know what parts I need to acieve this and the simplest way of putting it all together. I intend using it to power an electromagnet.

 

jpanhalt

Well-Known Member

Most Helpful Member

• Nov 6, 2012

• #5

The transformer for that design will be the most expensive part. I suggest that you price what transformer you can get. Then look at the cost of a used DC welder. The latter may be cheaper and be more capable in terms of current.

Remember, the fact that a welder can deliver up to 100 or 200 amps does not mean that your magnet will have to be designed for such high current. The amount of current the magnet will draw or try to draw will depend on its resistance and the voltage.

John

 

Last edited: Nov 6, 2012

A

Aadil17992

New Member

• Nov 6, 2012

• #6

If i step down mains to 12VAC and then connect to a bridge rectifier, i'll end up with dc. My problem is how do i influence the amount of current. Do i need specifically rated rectifiers to get such high currents?Basically, an AC-DC adaptor will give about 12VDC at around 1 amp, but i would like to achieve at least 30 amps.

 

MikeMl

Well-Known Member

Most Helpful Member

• Nov 6, 2012

• #7

You start with the electromagnet and work back.

 

crutschow

Well-Known Member

Most Helpful Member

• Nov 6, 2012

• #8

As MikeMi stated, start with the magnet. You wind that with the number of turns and wire size to give the desired ampere-turns and resistance. This will determine its operating voltage and current. To control the current you can add a large power resistor in series.