Hi,
I have a project about regulators. I have found a lot of circuits about it but they drop the current too much I need 20A finally. Can we do this by using arduino, or how can I do this without using arduino?
I would be happy, If you send any website or any document about it.
Thanks,
(and sorry my English :))
Nothing to do with an Arduino.
Is the AC isolated from the mains?
If so then a switching regulator is what you want to build. At 20A however it is a bit of a beast and is too complex for some one asking such questions.
The basic design is fine but the layout will have to be spot on. That is what will make it tricky and expensive.
What are you studying that has given you such a task?
48V200A to 12V 20A regulator
Is that 48 VAC or 48 VDC? (Either way, it's NOT an easy task!)
Yeah... 20 Amps is "a lot". You may not find a 12V / 20A power supply at your local electronics store, and most regulator chips are rated for 1A, or sometimes up to 3A. Of course it depends on context, and 20A isn't a lot for a car... Your car probably has a few 20A fuses and some circuits in the car will draw more than that.
I have found a lot of circuits about it but they drop the current too much
Power supplies & regulators don't "drop current", but there is a limit, depending on the particular circuit & components.... If you feed 48VDC into a 12V linear regulator and if you connect a load that draws 20A, the 48V side will be supplying the same 20A plus a little more to run the regulator. But, you'd never use a linear regulator because the regulator would be consuming more power/heat (Watts) than you are delivering to the load.
Power supplies don't "force" current... They supply voltage and the load resistance/impedance determines the current (Ohm's Law), as long as the power supply is capable of supplying the current. If the power supply is not capable, the voltage may drop, or the power supply may burn-up, etc.
i.e. If you live in the U.S., your AC power outlet puts-out 120VAC and is typically capable of 15 Amps. If you plug-in a 100W light bulb, it draws a little less than 1 Amp. Plug in another 100W lamp off all these appliances, you're drawing zero current. But, the voltage is always present.
Switching regulators are almost 100% efficient... If the regulator was 100% efficient, the 48V side
and you're drawing another Amp. Plug-in a hair dryer and you'll draw 12-15 Amps... And if you turn would only have to supply (12/48) x 20A = 5 Amps. In the real world, maybe you'd have to supply 6A. in any case, with switching power supplies/regulators you can get out more current than is coming in (at lower voltage coming-out than is going-in).
AC transformers are also fairly efficient. If you have 120VAC on the primary and 12VAC on the secondary, the 120V side is using about 1/10th of whatever current is coming-out.
48 to 12V at 12 Amps is a specialized power supply/regulator and I don't know where you could buy one. If you can't find such a thing, hopefully you have 120VAC or 240VAC power line voltage available, because you can find a suitable 20A supply that runs from "wall power".
20 seconds of Googling got me to "Golf Cart Voltage Reducer" on ebay.
Like this one.
Leo..