3v 50A diode laser power supply

Dear All,
As a part of a project I need to design a 3v (or 4V) 50A power
supply. This power supply will be part of a diode laser. Can Anybody
help me out. Any references?
Thanks in Advance

 

a PC power supply can probably handle that.

Colin =^.^=

 

dear
you can make it by using +3 ...0..-3 transformer .thenfull wav
rectifier (four 4n001 diode and then 7903 (regulator ic))total cost
will not exeed 50 r.s. if you need i will send you ckt it will work

 

SEE:

Review of Scientific Instruments
Volume 69, number 6 June 1998
Saam and Conradi

"Protection Circuitry for High Power Diode Arrays"

Also SEE:

Scientific Instrument s
Volume 74 Number 8 August 2008

"Laser diode current controller with a high level of protection
against electromagnetic interference"
Josef Lazar, Petr Jedlicka, Ondrej C p, and Bohdan Ruzicka


You need a 50 amp constant current source, not just a power supply,
that supply must start up softly with no overshoot in current or
voltage and no spiking, or you will destroy the diode(s).
The above two journal articles give basic large diode protection
schemes.


Steve Roberts

 

No, it will not...

The OP could check out the application notes for the low voltage
synchronous polyphase / multiphase buck regulators (as used in
on-board supplies on PC motherboards).

 

It's more like a 50mA power supply.

Best regards,
Spehro Pefhany

 

Well I did think it might be a typo! But it is repeated in the title
and the body of the post, so I decided to take the OP at his word.

 

4001 diodes handling 50A -hehe
dear- oh dear..

 

That sounds like a lot of amps for a diode. This a water cooled IR
cutting laser, or do you just need a 50 amp short duration pulse?

 

Humm, how big is this laser unit?
I mean, that's almost enough power to etch
are you sure it isn't more like 50 ma's ?

 

SNIPPED. Oprah this, money that, Telly this, Loot that.

Bloody loony.

 

Sure it will. Likely have huge ripple as well.

 

Will the spam never stop?
Does anybody realize that 4000 series diodes handle 1 amp and a 7903 -
if they exist- handle 1.5 amps negative voltage..sheesh..why am I even
staying up this late to put this bullshit up when I could be
sleeping,,I dont know,,
Bye yall now..

 

It's just numbers. It's like we have numbers arsing from the
requirement, probably in some arbitrary and clueless way, then we have
stock components with their numbers. So all you have to do is match them
all up and find a diarrhea-gram showing how to "hook" it all up. The
project is finished when a half-assed bench check convinces the confused
that the circuit is "doing what it's s'posed to do"- I really luv that
one, it sort of imparts a Biblical discipline to the process,"doing what
it's s'posed to do"- a person can get drunk on self-satisfaction with
making it all come together like that.

 

So, brainiac... tell us why MOBO makers all use switchers for low
level logic voltages, such as 3.3V, when all they need is your
transformer/full wave bridge/regulator solution?

I'll tell you why, dipshit... RIPPLE!

And in case you were drunk or half asleep when you chimed in with your
bullshit, the OP is looking for 50AMPS, idiot!

 

Just so you know, I thought you were the dolt that suggested the
transformer solution.

Calling my reply spam does make you a retarded **** asshole, though, if
that is what you were doing.

 

This is a typical supply requirement for the pump laser diode for a
yag laser, or the diode used in a platemaker, hes looking at maybe 20
watts of laser output if its a pump diode or about 60 watts of direct
diode output, those numbers may be slightly optimistic. Solid state
diode laser arrays of 500 watts output power are not unheard of these
days, so.... 50 mA is more typical of a laser pointer, but yes, he's
asking to pump a large array of diode chips.

Steve Roberts

 

Dear All,
It is really 50Amps. Now I understand that what I need is a current
controller.Thanks to you all . I want to take a look to the article
below but no luck. I cannot download it. "Laser diode current
controller with a high level of protection against electromagnetic
interference" Do you have other references to download?
Thans to you all...

 

well ok, that makes much more sense.
it would of lesson the confusion if the poster would
of indicated the used of diode arrays.

 

Ok, now that you have cleared that up.

I don't know where your expertise lye, so i'll
point you here to start with:

http://www.zen22142.zen.co.uk/Circuits/Power/add-on.html
That is a very basic current limiter add on to an existing
supply.
After looking at that for a bit, you could then start with
something like a basic computer switching power supply that has a
5 volt output as the base input to a current regulator.
by using large wattage and low value current sense resistors
along with high current transistors, you'll have your current
limiter.
Using the URL as a reference, if you need to pulse this
signal. Just look at R1.
There are better and tighter methods of current regulation
how ever. The use of an op-amp via the (+) and (-) inputs shunted
with a current sense resistor will give you an extremely sharp
current response to fold back the voltage on the driving circuit.

Something to think about.