rockmeupto125 Posted August 20, 2017 Share Posted August 20, 2017 I need a DC power supply for a project. Minimum 60 volts. Anybody got something laying around they are dying to get rid of? Please? Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted August 20, 2017 Share Posted August 20, 2017 Never heard of one with that kinda voltage, whatcha building? I think all it would take is some diodes to make something that would give you 120v DC from an AC outlet. DC is deadly stuff so be careful whichever route you take, I wanna say 40v is about the 'safe' limit with DC but don't recall for sure. Quote Link to comment Share on other sites More sharing options...
Furbird Posted August 20, 2017 Share Posted August 20, 2017 Are you trying to run a golf cart off of an extension cord or something? Damn that's a lot of volts. Be better off putting 5 car batteries in series. Quote Link to comment Share on other sites More sharing options...
rockertom Posted August 20, 2017 Share Posted August 20, 2017 Sent you a couple of pics via text. Quote Link to comment Share on other sites More sharing options...
TOXXIC Posted August 21, 2017 Share Posted August 21, 2017 Interrogating terrorsts? Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted August 21, 2017 Author Share Posted August 21, 2017 Development testing on a electric powered vehicle controller. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted August 22, 2017 Share Posted August 22, 2017 Minimum 60, but max...what? Like Oscar said, it's trivial to make 120v DC. How clean does it need to be? How many amps? Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted August 22, 2017 Author Share Posted August 22, 2017 I need 60 volts DC, no less. Adjustable would be nice in order to simulate voltage drop off when powered by batteries. So it should be a bench supply, not a welder. This is to run a 24 hour performance test on the controller. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted August 22, 2017 Share Posted August 22, 2017 You keep saying no less, but that implies anything more, which doesn't really make sense. What is the upper limit? I have a 0-140 variac, which could have a rectifier added. How long do you need it for? Do you understand the difference between true DC and rectified AC? And if you do, do you care for this project? If not, you need to think about it. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted August 23, 2017 Share Posted August 23, 2017 ...old arc welder windings? Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted August 23, 2017 Author Share Posted August 23, 2017 First off, we found one. Thanks for the replies and offers. Bullroarer designed the controller and needed to run a 24 hour test on it to determine durability. Can't run it on the battery system that long for a variety of reasons. So we were going bench test it here where it could be babysat for 24 hours straight. I said "no less" in reference to the maximum voltage needed, not "no less" as in the device must be unable to supply a voltage less than 60. Where are the grammar nazi's when they are needed? Quote Link to comment Share on other sites More sharing options...
SwampNut Posted August 23, 2017 Share Posted August 23, 2017 So you need exactly 60v? Otherwise "no less than" is the same as "no more than." And again, if you know about and can account for pulse DC, that's fine, but if you aren't thinking about it you should be. Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted August 23, 2017 Author Share Posted August 23, 2017 Its necessary that it be able to supply 60 volts. If it can supply any other voltage, that's great. I don't know the specs of the unit he procured. The controller takes the battery current and turns it into pulsed DC. So the power supply should be linear, as a battery. I presume in the actual application there are caps to regulate the input to the controller. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted August 23, 2017 Share Posted August 23, 2017 Do you have an oscilloscope to look? Power supplies vary in cleanliness. It takes a LOT of effort and cost to make a true pure DC power supply, so the question becomes...how much noise can your device tolerate? If you have a battery pack, running the pack in parallel with the power supply makes it nearly perfect (assuming a charged or nearly-charged pack). I'd also love to hear more about the project. 1 Quote Link to comment Share on other sites More sharing options...
XXitanium Posted August 24, 2017 Share Posted August 24, 2017 (edited) Clean well conditioned power. I watched an expensive UPS system fry (two days in s row) on a 480v gen set. Once you let the smoke out, it is impossible to put it back in. ...something about the shape of the sine wave combined with digital controllers. Edited August 24, 2017 by XXitanium Quote Link to comment Share on other sites More sharing options...
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