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48v to 12v Buck converter

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Bakr.hesham

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How can i design a converter from 48v to 12v ?
the 48v came from batteries needed to be connected to a 45kw or 60kw generator instead of it's 12v battery to take the first latch.
thanks in advance
 

Hi,

Just to be sure: you need a 48V to 12V buck converter with 45..60kW?

Klaus
 

KlausST said:
Hi,

Just to be sure: you need a 48V to 12V buck converter with 45..60kW?

Klaus
Click to expand...

to give the generator a latch up to start working a 12v battery used, i have a 48v battery pannel ,then i need a 48v to 12v converter that can bear the current passing through it.
 

The interesting parameter in this case is the generator winding resistance. I guess, the DC current with a 12 V battery could be easily 100 or 200 A, so making a buck converter only for initial generator excitation sounds a bit extravagant. An electronic switch setting a short current pulse from the 48V battery would be sufficient.

In case it's a synchronous generator, did you consider to feed the 48 V to the excitation winding?
 
Correct me if I'm wrong, but all generators I've seen are self excited.
During start up the residual magnetism is sufficient to generate the initial bootstrap to create additional field strength, until is enough for the voltage regulator to start operating.
 

Yes, remanence is normally sufficient for the excitation to come up. But the remanent magnetization can be "erased" in some situations. Then tapping the generator terminals with a battery is a simple way to revive it.
 

If its only needed for energising initial start up over a second or so, why not just a very high wattage resistor direct from 48v to the field winding ?

As the whole thing will be self exciting, it may not require very much current to start up the self regenerative process.
A bit of experimentation may be required, but a fairly limited current source should be able to do it.
 

How can i design a converter from 48v to 12v ?
the 48v came from batteries needed to be connected to a 45kw or 60kw generator instead of it's 12v battery to take the first latch.
thanks in advance
Click to expand...


Hi

45 /60 kw inrush power ?!!!


buck converter with such a high power can be made but it require a lot of experience and money !

But i guess you mean your generator can handle such a power and inrush current to start that generator isn't like that ?!

A friend of mine in his factory has an old 200kW Generator . i saw it require start up aux PSU in order to work . he uses several 200A/H 12v batteries to supply it then after the transient time it uses fuel and works .
I guess one of the best ways is replacing your batteries with 12 v batteries !

Best Wishes

Goldsmith
 

But i already have the 48v batteries to load the system on it till the generator operates , so i want to save the 12v battery and use the 48v battries.
 

A simple 48 to 12V buck converter with a 10A current limit will suffice - go to ebay or ali express....
 

A high power resistor in series with the 48V would be a quick and fool proof solution... yes
 

A high power resistor in series with the 48V would be a quick and fool proof solution... yes
Click to expand...
Hi
Sorry but using a resistor doesn't seem good ! high value of dissipation and it's not a certain way !

Best Lucks
Goldsmith
 

goldsmith said:
Hi
Sorry but using a resistor doesn't seem good ! high value of dissipation and it's not a certain way !
Click to expand...
Try it first before you completely discount the idea.
Ten amps may be enough to start up the self excitation process, its only a few hundred watts and probably only required for one or two seconds.
 

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