3v 50A diode laser power supply

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).

--

John Devereux

It's more like a 50mA power supply.

Best regards, Spehro Pefhany

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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.

--

John Devereux

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?

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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 ?

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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 f*ck 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

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

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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:

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.

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