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Need DC converter

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Thread replies: 18
Thread images: 1

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Looking for a DC-DC converter board preferably from EBay.
Input: approx 24V
Output: 40V - 60V approx 3A

Must be current limited adjustable and short circuit proof. RELIABLE !

Prefer isolated but not really necessary.

< $30

Recommendations ?
>>
>>1240806
Nobody here can make a recommendation better than eBay itself. You search what you're looking for and look for reputable or reliable sellers, and double check to make sure you know what you're getting. Try "variable boost converter" with combinations of your specs in there. You're not going to find something specifically "short circuit proof" or specifically "RELIABLE", but if you know your shit you'll easily be able to fix anything that goes wrong on it. You can coat the whole thing in epoxy (or hot glue if you're a sick bastard) to waterproof it, but it's really not worth doing unless you plan on taking it swimming, a good enclosure will stop anything from getting in there and shorting it. And in the end you get what you pay for anyway.
>>
>>1240806
>buy for me
no fuck you nigger. get cancer and delete your thread.
>>
>>1240816
>>1240817
If you have not used any specific board or module with experience to share, go find some other thread to troll.
>>
>>1240821
>go find some other thread to troll.

why are you whining about >>1240816

He gave excellent advice.
>>
>>1240816
>You're not going to find something specifically "short circuit proof"
Why not ?
>>
>>1240806
vicor
>>
>>1240833
Well they all are, to some extent. You're not going to get a random short circuit in any modern piece of electronics without some other cause, be it dust or water ingress, or maybe overheating. If you're worried about those particular causes there are precautions you can take, but a short circuit is a symptom and not a cause. Most PCBs have a solder mask and possibly a conformal coating that will prevent things that touch the PCB from shorting them, conformal coatings usually coat everything else on the board too, but as long as you make sure there aren't any loose wires or other conductive parts, a bad environment for water or dust ingress, or some other blatant failure mode then you should be fine. Just FYI, I would put any eBay PCB inside a box to prevent water ingress if it doesn't have one already, and adding ventilation is a good idea if it has a large heat sink on it.
>>
>>1241206
>Well they all are, to some extent.
No they are not. Buck converters are especially prone to short circuit problems that often only a fuse might protect against.

> You're not going to get a random short circuit in any modern piece of electronics without some other cause

Without knowing the OP's application you cannot know this.
>>
>>1241255
>Buck converters are especially prone to short circuit problems

Did you mean to say boost?

>>1240806
What is wrong with the module in your pic? Banggood has a version of it for 22$. Given you want it for <30$ you're stuck with chink shit, so expecting reliability guarantees is silly.

https://www.banggood.com/400W-DC-Converter-Boost-Step-Up-Power-Supply-Module-6-40V-to-8-80V-p-1031478.html
>>
>>1241271
> What is wrong with the module in your pic?

It's 10A, more larger and overpowered than needed and uses a fuse for short circuit, so the current limiting must not be very good/ trustworthy.
>>
>>1241255
>especially prone to short circuit problems
What causes these? I've never had any DC converters spontaneously shitting themselves. Is it overheating component knockoffs that aren't rated as high as they say? Overheating from inadequate cooling? Where do these shorts happen?
>>
>>1241296
Simple boost converters have a DC path from input to output (an inductor and forward diode). Short them and you short the input.
>>
>>1241296
>What causes these?
(output short circuit problems)

It's related to the topology of the basic Boost converter.
A short circuit on the output causes full supply current thru the coil and output diode unless special care is taken in the design, making it more expensive.
(or you will blow the fuse a lot)
>>
>>1241303
>>1241306
Ah, so they short if you short the output. But an isolated DC converter wouldn't have that problem, which is a semi-specification noted by OP.
>>
>>1241344
Isolated high power DC DC adjustable modules are pretty much non existent. Only mains to DC and potted low power fixed voltage converters are easily available isolated.

SEPIC is his best bet, the one in OP's picture is likely SEPIC because of the two inductors.
>>
>>1241206
>PCB inside a box to prevent water
>has a large heat sink on it
>adding ventilation
notice something?
>>
>>1241513
You can make a waterproof heat exchanger, but those ideas weren't necessarily made to be put together.
Thread posts: 18
Thread images: 1


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