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On-line uninterruptible power supplies with two-relay bypass circuit and methods of operation thereof

  • US 20030227785A1
  • Filed: 06/06/2002
  • Published: 12/11/2003
  • Est. Priority Date: 06/06/2002
  • Status: Abandoned Application
First Claim
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1. An on-line uninterruptible power supply (UPS) comprising:

  • an AC input configured to be coupled to an AC power source;

    an output configured to be coupled to a load;

    an AC/AC converter circuit coupled to the AC input and operative generate an AC voltage from the AC power source;

    a first mechanical relay coupled between the AC/AC converter circuit and the output;

    a second mechanical relay coupled between the AC input and the output; and

    a control circuit operative to control the first and second mechanical relays to selectively place the UPS in an on-line mode in which the first mechanical relay couples the AC/AC converter circuit to the output and the second mechanical relay decouples the AC input from the output or a bypass mode in which the first mechanical relay decouples the AC/AC converter circuit from the output and the second mechanical relay couples the AC input to the output.

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