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| where does one buy a 600VDC 10kW power supply? |
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| james_s:
--- Quote from: Simon on January 30, 2020, 07:17:11 pm ---Rotary converter? --- End quote --- They were used to convert AC to DC, DC to AC, between different AC frequencies and to step up DC voltages, for example tube electronics that ran on 28VDC aircraft electrical systems prior to solid state electronics that were up to the task. Essentially a combination of motor and generator on a single armature they were made in sizes from maybe a few tens of watts up to many tens of kilowatts. |
| Berni:
--- Quote from: Simon on January 30, 2020, 07:17:11 pm ---Rotary converter? --- End quote --- Its a motor turning a generator. Motor and generator can be selected for the kind of power that is needed. Say 3 phase 400V 50Hz motor running a 48V DC generator. Or single phase 60Hz AC motor turning a 3 phase 400Hz AC generator. In some cases the same motor can be used as a generator simultaneously. With the advancement of power electronics they have been mostly replaced with switchmode power supplies/inverters. They are still commonly used tho for making 3 phase power out of single phase power(In the US its difficult to get 3 phase power in residential areas so people with machine shops use them to run 3 phase machines). But yes your specifications for this 10kW power supply are a bit sparce. Does it need to be variable from 0 to 600V? Does it need to be regulated? What is the input power to it? Does it need to be isolated from mains? Does it require any current limiting functionality? The huge rack mount PSUs that users are suggesting above indeed cover all of these questions above. But as people have said they these kW cost kilodollars. Don't be surprised to find most of them costing over $5000. But if you have the money you just need to call up TDK or Keysight and soon after have a huge heavy box show up at your front door. If you don't have the kilodollars then its ebay (Will still cost easily 500 bucks tho) or drop some of the above requirements to let you use a more crude PSU solution (Like rectified mains) |
| duak:
Over the past 20 years, CNC machine tools and automation systems using multiple Variable Frequency drives have been going towards a common DC link, likely to increase efficiency by recovering regenerated energy. ie. no braking resistors. Here's an example of a commercial product: https://www.beckhoff.com/AX8640/ I'm not recomending this particular one; it was just first one on a google search. Note that the DC-link is not isolated from the mains so a transformer could be needed. |
| Simon:
Whats the best course of action to find out any regulations that apply to use of a supply that produces up to 1'500V ? I would have this locked off at less than 1'000V. |
| Berni:
--- Quote from: Simon on February 05, 2020, 08:21:34 am ---Whats the best course of action to find out any regulations that apply to use of a supply that produces up to 1'500V ? I would have this locked off at less than 1'000V. --- End quote --- Again too sparce. If you are making 1500V to run a electron gun in a CRT of a TV, nobody is going to care. As long as the user can't just grab the 1500V its fine. If you are sticking a 1500V battery pack into an electric vehicle there is gonna be some paperwork involved before you even start making that battery pack. When it comes to test equipment it is generally assumed that the user knows what he is doing. So the only darwin award deterrents are generally scary warning stickers and easily removable plastic cover here or there. The user has to hook it up somehow after all. And this is not only high voltage PSUs, there are other things that can produce high voltages such as SMUs, Calibrators, Megaohm meters. Also RF test equipment can be used to seriously jam important radio bands and get you a visit from the local authorities. The user is simply expected to know what he is doing and do it at his own risk. But in general someone is going to be responsible if something bad happens. So if you build a production test system that is going to be operated by idiot workers that have no idea what they are doing, then you better make it safe. The company is going to be in some seriously hot water if someone kills themselves grabbing a test jig at 1500V. So even if the regulations don't say anything does not mean that you should ignore having safety interlocks on things that can kill people. Regulations are mostly only there to make it harder for idiots to kill themselves with the common dangers. It does not replace common sense |
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