Full-range input, 120V output UPS

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  • Behemot
    Badcaps Legend
    • Dec 2009
    • 4845
    • CZ
    #1

    Full-range input, 120V output UPS

    Not sure if it's the right section, but it's not about repair…

    Customer would like what basically is an on-line UPS with full-range input and 120V 60Hz output. Frequency/voltage converter as he put it which is also battery backuped will be almost impossible to get so I have been looking after UPS only.

    What was my surprise that the cheap morons produce just full-range 230V output, but not 120V output UPS. Plus there is usually some auto-detect crap for frequency - I need 60 Hz no matter what goes inside. Any tip?
    Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30983
      • Albion
      #2
      Re: Full-range input, 120V output UPS

      you need a 2 stage design.
      first a buck/boost supply to create a dc voltage of say - 60v, then an invertor to get the output.

      you can get chinese buck/boost circuits, but what input range??

        Comment

        • Behemot
          Badcaps Legend
          • Dec 2009
          • 4845
          • CZ
          #3
          Re: Full-range input, 120V output UPS

          No, I need on-line UPS with buck/boost controller. Ordinary ones have boost controller, but I don't think its that complicated to make it run buck/boost, almost all the things are already there.

          If it is say 120V nominal, than it is boosted to higher voltage anyway, and only than a clean 120V nominal sine-wave is created. The only difference is it most likely boost to something like 200 V from which it switches 120VRMS sine-wave. All I need is for the inverter to be able to work with 315 V DC bus.

          Don't want any of them stinking chinese crap, from what I've seen most of them are PoS. Even if it has sine-wave, which usually does not, it is made in strange design. Just got an inverter which I'll post here soon, it is basically 8 parallel-driven inverters together. How surprising it failed…

          I think them US boys may know about something since this voltage is what they use.
          Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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