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Forum Index : PCB Manufacturing : Need cad file for 48v regulator

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BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 873
Posted: 10:51pm 02 Aug 2020
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I was hoping somone would want to design
a external 48 volt voltage regulator for a alternator

I am would pay them for it

I would need a cad file so I can get pcbs
made

Anyone interested please private message
me with price

I am not even sure I could afford it but would appreciate any info on prices and how to make it happen

Thanks for your time
 
bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2370
Posted: 12:11pm 03 Aug 2020
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Hi Ben,

What exactly are your specs?

Ie.

Physical size you are looking at
Current draw/load
Input power specs ie. 240Vac , 60VDc, 24v dc?

I gather the alternator supplies the source power..

Do you have a schematic of a working one?

It might be out of my skill set if high current as you would need some serious pcb copper..

Any way over to you.

Regards,

Mick
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 873
Posted: 01:53pm 03 Aug 2020
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It needs to work like a normal car truck van alternator

It controls the field coils with up to 4 amps to regulate the output of the alternator

With the voltage being 48 volts instead of 12 may only need one amp for full out put

Thank you for your time!
 
bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2370
Posted: 05:37am 06 Aug 2020
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Hi Ben,

If you have some circuit schematic I think I should be able to knock up a design for a PCB for you (Happy to it for free or for a couple of beers).

I think, at this stage I will abstain from designing the circuit itself as I know little about how alternators work.

Kind Regards

Mick
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3370
Posted: 07:15am 06 Aug 2020
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That is the problem Mick.

Ben still seems to think a 12v alternator with the right kind of regulator fitted to it can supply 48v output.  
He does not seem to realize, even though its already been explained to him, that a voltage regulator can only REDUCE the output voltage, not increase it.

He keeps asking repeatedly for someone to design something to do the impossible, it just goes on and on.
Edited 2020-08-06 17:26 by Warpspeed
Cheers,  Tony.
 
bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2370
Posted: 11:27am 06 Aug 2020
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Hi Tony, Ben,

If that is the case, that it is a 12v car alternator and you need 48v and  it is only 1amp

You could use a 150 w inverter and then generate your 48vdc from that..    a bit clunky but possible?

Ben, is this for use in a car or similar? Or on some other application?

Regards,

Mick
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 747
Posted: 10:59pm 06 Aug 2020
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Hi,

I don't want to ruffle anyone's feathers but a 12V alternator WILL produce more than the 13.8V or whatever the manufacturers decide is good for our batteries.

I have a 12V alternator with a home built external regulator connected to an engine producing 42V for a 36V system.

The field still has to run from a 12V supply to limit the current which the regulator controls.

(I did mention this system in another post many moons ago when this subject previously came up.)

My in initial setup had a fairly high pulley ratio & I got the rated current out of it. I've since relocated the alternator & had to lower the pulley ratio with a subsequent reduction in the 42V O/P current.

The only thing I am sort of worried about is the voltage ratings of the main diodes if the voltage is taken too high. There maybe other factors I haven't considered or really worried about.

With my initial setup, the load was only intermittently high, so it was never tested for continuous operation.

Now what did I do with the circuit?

Brian
ChopperP
 
Warpspeed
Guru

Joined: 09/08/2007
Location: Australia
Posts: 3370
Posted: 12:34am 07 Aug 2020
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  Chopperp said  Hi,

I don't want to ruffle anyone's feathers but a 12V alternator WILL produce more than the 13.8V or whatever the manufacturers decide is good for our batteries.
Brian

Yes, but to charge a 48 volt battery, it needs to be turned at about roughly four times the normal rpm, and that is going to be a real problem in a road vehicle.
Cheers,  Tony.
 
Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 747
Posted: 02:32am 07 Aug 2020
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I agree re RPM. He may be able to use a bigger drive pulley and/or run the engine faster.

There certainly has to be a better solution all the same.

RE Ben's 1 amp. I think he was referring to the field current which was not a correct assumption on his part.

Brian
ChopperP
 
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