/diy/ - Do It Yourself

What's the 500V for? What kind of current do you need at 500V?

>>1924569
Frankly, if you need to ask this question, you've got no business trying to make one.

>>1924572
My bad, forgot to clarify - 500 DC and current less than 1 A.

>>1924575
Frankly, if you can't provide any help, there is no place for you

>>1924575
Frankly, that sounds like a dumb fallacy. Perhaps it is the case if detailed plans for such a device does not exist, but just because you can't personally design something doesn't mean you can't build it with proper instructions.

>>1924572
>>1924569
you need to be way more specific than this even.
an autotransformer, rectifier, capacitor will give you adjustable 500V/1A very quick and easy but you might have to rewind it or overvolt if you can't find one.
otherwise look into boost controllers but 500V/1A is significant.
easiest way is have friends in good places, university i used to work at we needed something similar for a project and found a couple dusty rackmount supplies in a cupboard. nobody missed them for a few weeks and i doubt has touched them since. not helpful i just hate how wastful and greedy these places are.

>>1924579
You're not even asking any questions you fucking idiot, just waiting for people to spoonfeed you every step of the process.

>>1924621
>you need to be way more specific than this even
Well, I need the input to be 220-230 AC Volts, and the output should be filtred from the AC as much as possible.

>>1924656
Well, maybe you should learn2read and consider a vfd. 4chan ain't gonna help you build your cuck machine neither bud. I do hope you kys with your misunderstanding of electricity and human nature. Don't forget to livestream!

>>1924654
>>1924672
Oh boy, you're such loser if you trying to do what? Get attention in a thread where you not even welcome? Well, just close this page, no one is asking you to stay. Toxic bitch

>>1924579
Lmao, you're a retard OP but that was pretty funny.

For the rest who wants to help:
Power supply with adjustable output DC voltage up to 500 V, current no more than 1 A and input of 220-230 AC. Prefferably scheme or the way how to combine some other schemes.

>>1924656
>filtred from the AC as much as possible.
how accurate do you need the output voltage
how precise do you need output voltage
what is the current draw profile
do you need current limit
what is acceptable ripple min/max/width
what is minimum voltage output
what is minimum current draw

>>1924710
Sure opie, just wire into two ac outlets at your house then hook up a diode to your two wirenutted power cables
>>1924716
He doesn't know what that means

>>1924716
If we're talking about the DC component then:
>how accurate do you need the output voltage
About 10 Volts
>how precise do you need output voltage
+- 5 Volts
For the AC component the lesser the better, starting with 0,1 Volts
>do you need current limit
Is it my mistake to think that the load set maximum current?
>what is minimum voltage output
Everything less than 200 will do, I think.
>what is minimum current draw
50 microAmps
>what is the current draw profile
Here I can't really answer
what is acceptable ripple min/max/width
About 0,1 - 0,01 would be nice

>>1924770
>Is it my mistake to think that the load set maximum current?
Imagine having never used a bench supply and wanting a 500v one.

>>1924771
So you're monitoring this thread just to make stupid punchlines? That's sad, dude

>>1924775
Actually, I think you were the punchline here. Why don't you just say what this shit is for? Current limiting is pretty self-explanatory. It means that the current will never exceed the limit you set. It's a standard feature on bench supplies.

>>1924569
why dont you just go and buy one if you need it ...chinese ones are cheap and useful ...considering you have no experience with this you will most likely either fail or cause permanent physical damage to yourself ...500V DC is extremely dangerous

>>1924770
To get you started, I did something like this in my circuits class exam.
From memory it was something like: calculate the approx turns ratio, your load resistance, secondary coil resistance, total emf of the secondary circuit, reflected impedance, ideal reflected impedance at 45 deg phase angle for max power, match ideal reflected impedance to primary coil resistance + inductor reactance. I guess add a rectifier to get dc out of it.

>>1924797
that will give him absolutely unregulated voltage and current, will most likely overheat and is not adjustable

>>1924770
I had a transformer design problem on my circuits class exam.
From memory it was something like: calculate the approx turns ratio, your load resistance, secondary coil resistance, total emf of the secondary circuit, reflected impedance, ideal reflected impedance at 45 deg phase angle for max power, match ideal reflected impedance to primary coil resistance + reactance.
I guess add a rectifier to get dc out of it.

>>1924792
I have experience in making sometheng, not calculating it.

>>1924776
If you mean maximum possible current, 1 A then

>>1924798
Why would it be absolutely unregulated?

>>1924770
wait so is it AC or DC output then ? because you are contradicting yourself

>Is it my mistake to think that the load set maximum current?
absolutely a mistake ...you want to be able to control the current your load sinks otherwise your load could sink more current your source can give and fry the source , also it gives you rudimentary short circuit protection

btw a 500W power supply at 500VDC is a big deal and not remotely trivial ...SiC MOSFETS capable of handling that voltage in the switcher circuit (you will need a switcher because i doubt you have a 500W heatsink) cost like 25$ each , and you will need a handfull of them

making one from scratch especially if you dont know what you are doing even with a schematic isnt a really viable thing ...go find one on ebay that has at least some protection before you kill yourself and someone else ...500V DC at 1A iz instant death btw

>>1924802
because transformer output is dependant on the output impedance of the circuit ..voltage and current will be dependant on the load connected to it and you have no control of the output current or voltage that way ...you need more than just that ...also a transformer that can do 500W transformer is as big as your head

>>1924575
true that I mean I dont need 500v at 1 amp but off the top of my head i could think of serval ways of doing it. and if i was really wanting to do it I would look it up on google and steal a somewhat robust design.

Real answer to op though why ? what are you trying to do ?

>>1924804
shit, how does a power supply handle variable load then?

>>1924809
it has an output circuit with transistors and op amps which have high input impedance which decouples the power supply from the load ...basically you have a buffer between the things

>>1924801
I don't.

>>1924575
This. OP, unfortunately that anon has sound advice if you are inexperienced with high voltage. Have you considered topology? Cost? Isolation? The quality of the parts? "Simplest" way to do it is a linear regulator; a supply of that magnitude will require a huge amount of thought and planning and it will be time consuming and expensive to build. I'm doing one up to 450V, 3 channels, with preregulation, current limiting, been planning the thing for about 9 months; the capacitors for the voltage tripler were $150 each not counting a substantial transformer and heatsinking. It will get very hot if you don't reduce the voltage before the main pass element (VT, MOSFET, transformer tap switching etc...) and decide to run it with low voltages on the output and a load ready to ruin your day. SOA becomes extremely critical if you dislike crispy components. I would recommend buying one to save time but it seems pretty clear to most people you lack the experience...do some research, there is tons of info out there on the subject, but beware because that kind of voltage will kill your ass dead before you hit the ground. Be smart about this.

>>1924770
>About 0,1 - 0,01 would be nice
He probably means how fast changing and how big jumps the load has and what load response is acceptable.

If you look at pic. related ripple is that small pulsations due to system design (AC voltage, Inductor ripple, noise etc). When you suddenly connect big load, the average voltage will jump and it is difficult to keep it within ripple you state.

0,1/500V=0.02% is very demanding ripple. Most converters guarantee get you to 1% ripple and +/-6% transient at 50% load change and that is at low voltages and static input / output - means cheap capacitors and well optimized components.

So yeah, your requirements are too vague to guess a good solution. Either you give detailed specification or describe what the supply needs to do.

E.g.:
Does the voltage needs to be continuously adjustable (analog knob) or can it be done in steps (digital buttons, multi position switch) etc.

Does it need to have galvanic isolation, to what voltage (e.g. you want to add 500V to existing 2kV device you do not know polarity of)?

And although rude, those people dissing you have valid points. With knowledge so vague in electronics you probably don't have the expertise and tools to operate such supply in safe manner.
It wont zap, tickle or burn you like even 230VAC would. It will capture and kill you instantly on smallest contact. In addition HVDC has the perk of slowly finding path where you initially doesn't have it - so you touch a wire with shitty pliers - feel nothing until breaks 100V and few uA, your hand cramps on pliers, it jumps to 500V and dozen mA and you're toast.

Forgot the pic.

Also, you should implement at least basic safeties to avoid fire hazards and other mishaps if the load is e.g. defective.

>>1924850
the last part is basically why this shouldnt be attempted without good knowledge of what you are doing ....this kind of regulator requires output capacitors of about 1000uF for 500V ...if you grab a hold of 6 people and hold eachothers hand in a line and you accidentally discharge the cap on yourself all six of you die instantly and im not even fucking joking ...that also means that those thick metal cases they usually come in are that thick first of all to dissipate the heat but also thick enough because if something on that thing shrort circuits and blows its literally shrapnel city...dont fuck around with high DC voltages man it aint a joke like AC

>>1924850
>It wont zap, tickle or burn you like even 230VAC would. It will capture and kill you instantly on smallest contact.
i remember being in physics at school and being shown attraction of two pieces of aluminium foil with opposing currents, teacher used an hv bench supply and brushed the back of his hand on one of the foils. he didn't explode or die but it was the only time i ever heard him swear "oah!, shit!, fuck!" hmmm the good old days.

>>1924930
>dont fuck around with high DC voltages man it aint a joke like AC
What? AC is more dangerous than DC.

>>1924938
thats not entirely true...AC is more conductive due to our body capacitance ...but DC is more lethal due to pyhsiological effects on the body ...AC alternates between max and zero and is much easier to break free from its effects ...also AC can depolarisation and again spontaneous polarization of the heart muscle neurons where DC just literally depolarises you and you constrict and die

>>1924938
idk about you but i got zapped by 400VAC and 40VDC and id rather stick my dick into AC than use any body part to touch live DC again

>>1924939
You got it the wrong way around. DC only causes a single contraction that usually throws you away. Because AC switches quickly it causes you to hold on. This also messes with your heart much easier than DC.

Also, 500V AC will also have a higher peak voltage.

Of course at 500V DC is also very lethal.

>>1924945
Not necessarily. I once was stupid enough to work on a CRT TV just after I plugged it in, old Sony with a failing red gun. Anyhow I failed to discharge the supply capacitor and earned myself an excellent sparkle pony master charge that left a mark on my hand that is still there to this day. Best part is? I couldn't let go of the board until Mr. Cap decided he had enough, only 470uF as well. The capacitors OP would require would contain enough energy to blow his hand apart. If you're bored, charge up something like 4700uF at 500V and throw a pork chop on it, it illustrates the safety factor that much more. Playing with this stuff is just as smart as playing with a loaded gun in the hands of someone lacking precaution and experience.

>>1924577
>>1924579
>>1924710
you are monumentally stupid

>>1924939
this is 100% backwards and full of bullshit.

>>1924569
Here you go skippy knock your self dead.

>>1924569
or this one little camper
https://www.edn.com/the-1955-heathkit-500v-ps-3-power-supply/

>>1924569
>Every kind of help is welcome.
asks for every kind of help, rages against actual help recommending he not build one.

>>1924569
Alright, I'm just gonna go ahead and point out that even proper high voltage power supplies such as the Fluke 412B/415B have significant power limitations. The 412B is a fully adjustable 2.1kV PSU but only has a maximum output power of 63W, which is 30mA at 2.1kV. You can't try and pull 1A off this PSU without loading the output down, and this is lab grade instrumentation.

A 500W high voltage power supply is of course possible, but it's not something you'd see outside of power distribution applications and frankly it would be very difficult to design and very expensive as well and frankly based on quality of this thread I don't have much hope for you in this regard OP.

If you actually want to build a 500V supply on a budget and get it to actually work you're going to have to accept some constraints in the form of limited adjustability and or lower output current.

The fastest cheapest way for such a supply is a vfd. 1hp 575 and a step up, tapped down a bit, then tie into the dc link. Most actually let u set a dc output and the amps are programmable. Course if OP were literate and had more than shit for brains, he'd be able to read a manual. Instead he came here to pick fights and argue like a retarded roastie who just learned what meetoo is. Pity that op is a moronic lunatic whom can't recognize help when he sees it. I dunno why anyone would diy build such a supply when they are literally everywhere, unless you're one of the failed, impractical highschool teachers who hand out advice here. I swear it's a fucking tendies buffet here some days.

How about an old stick welder. I don't recall how much voltage they put down, but it's enough power to rapidly melt 1/4" welding rod.

>>1925313
Usually a max of around 60-70v open circuit, under load it's very low. Stick welders are constant current supplies not constant voltage

Batteries make good high voltage & high current power supplies.

>>1925376
not for 500V as batteries have resistance, and Im pretty sure that op has no clue of what he is doing , if you need diy 500w psu and ask 4chinkz for help smth aint right

>>1924569
If you need continuous control, it is hard. If you can be ok with discrete control and low current, look up a Cockcroft–Walton generator.

>>1925569
not op but i never thought about making a cockroft-walton and using like decade switches to add more diodes to the loop, that's actually brilliant to have a bunch of discrete voltage outputs

Looks like OP baited us with classic DIY Bingo thread and GTFOed when he got bored.

Anyway since this seems to be rather interesting engineering problem ill continue :D.

IMHO it would be most efficient to directly utilize voltages of mains.
I'd start by getting cheapest 600W transformer that's approximately 1:1 and preferably have several secondary taps, because isolation from mains should be minimum.
Then i'd divide output in ranges configurable by taps and simple diode bridge or 50hz 2x multipliers so that they fit within the power dissipation of linear regulator of my choice.
E.g. for the sake of DIY coolness we might pick this tube regulator. So it can do 33W to plate. This means at 1A it can down-regulate 30V with headroom for regulation. Maybe use 2 tubes for more usable ranges.
For sake of simplicity i'd just huge ass capacitor the output, which hopefully would allow switching ranges without dropouts.
Then we just need some current limiting and monitoring circuit on output.

don't microwaves have a 20+:1 transformer rated for 1000+ watts? why not full bridge rectify that if you want pissing high voltage?

>>1926191
Two in series would be a better idea, since microwave transformers use the absolute minimum amount of iron necessary and are meant for a pretty short duty cycle.

>>1924569

>>1925569
This, it even works with 9V battery so OP can take couple of electric shocks to his fingers and think again before grilling himself with some more powerful voltage source without knowing anything about the risks and electricity.

By the way OP where do you need your 500V voltage?

I used to make power supplies for a living. Out of curiosity:
1) What are the desired output ranges for voltage and current?
2) What are the desired resolutions for both voltage and current?
3) What are the weight and size constraints?
4) What are you using for cooling?
5) What is your budget?
6) What is your experience level with power electronics?

>>1928516
On a unrelated note, is it difficult to rig up 2 quadrant PSU if you got lab PSU and electronic load?
I imagine all you need is diodes or o-ring circuit?
4 quadrant i guess would be more difficult because load expects certain polarity.

>>1924569
You gotta apply for your workmen's permit before you can even think about any project like this...I know it sucks but it's the law!

>>1930662
dude knock it off with your unfunny meme. It was a good joke, but now you've already told your joke and it's over. Retelling it like a sperg on an anonymous forum is sad.

>>1931158
I don't know howbmamy unique user use DIY so I blanketed multiple threads.

>>1924569
https://www.youtube.com/watch?v=MBchcoAXCzc

>>1924569
you could go portable . the following is sort of what i used on something i am putting together. i added 2 potentiometers used like variable resitors. it boosts voltage with the transformer at between 95 khz and 110 khz and then rectifies it but does not smooth and then splices in higher current from a second power source. why 2 instead of 1? what i made is battery operated and the emitter from 1 bjt drives another bjt to regulate the output so its not just a stream of 4 amp with spikes of 300 volts. its dc pulse on what i made. but the following is sort of what you could use instead of standard switch mode power supply

im sure tons here have better stuff but this is sort of basic and not that complicated. as long as your transformer has about 300 windings to 400 windings this should work fine for your volt needs and insures amps higher than your secondary input. both currents combine

you can smooth it if you want but you need to add another diode after the capacitor facing the diode from the second power source. you can also consolidate the power sources i tested it with 1 battery. it works but your voltage will drop to in my case half the dual output. the circuit acts like a current divider . less input current less outgoing voltage since the transformer only knows the magnetic field is smaller. its something to factor in in the transformer you select or rewind for this

>>1924703
Not even the same guy, just wanted to agree.

You're unbelievably retarded, OP.

>>1924569
- get 55 of those 9 volt batteries
- put them in series like pic related
- adjust voltage by adding/removing cells
- die (no really, these fuckers will kill you)

>>1933717
What about doing this but with Ni-Cd batteries. When they wear, OP could charge the whole pack with a DC 500V power supply. He can build one with regular 9V batteries.

>>1933738
Sure he can. It's just that this battery form factor is comfy because you can connect them in series without additional hardware or soldering.

>>1924569
220v ---> variac ---> bridge rectifier ---> output
you can regulate that output with high voltage mosfets or igbts
it can absolutely kill you be careful

>>1935490
to clarify, i mean regulate it constant current, to limit the current to 1 amp