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LPS architecture for UPS systems

  • US 9,979,218 B2
  • Filed: 11/22/2013
  • Issued: 05/22/2018
  • Est. Priority Date: 11/22/2013
  • Status: Active Grant
First Claim
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1. An Uninterruptible Power Supply (UPS) system, the UPS system comprising:

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

    a transformer including;

    at least one primary winding configured to be coupled to a DC power source; and

    at least one secondary winding;

    a relay configured to selectively couple the input to the at least one primary winding;

    a sense circuit coupled to the input and the relay;

    a current control circuit coupled to the at least one primary winding; and

    at least one output line coupled to the at least one secondary winding,wherein the sense circuit is configured to monitor a level of input AC power at the input, determine whether the level of input AC power is above an input power threshold level, control the relay to couple, in a first mode of operation of the UPS, the input to the at least one primary winding in response to a determination that the input AC power is above the input power threshold level, and control the relay to decouple, in a second mode of operation of the UPS, the input from the at least one primary winding in response to a determination that the input AC power is below the input power threshold level, andwherein the current control circuit is configured, in the first mode of operation of the UPS, to control current from the AC power source through the at least one primary winding to generate an output voltage at the at least one output line and, in the second mode of operation of the UPS, to control current from the DC power source through the at least one primary winding to generate the output voltage at the at least one output line.

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