DC and AC uninterruptible power supply

  • US 7,259,476 B2
  • Filed: 04/26/2005
  • Issued: 08/21/2007
  • Est. Priority Date: 04/26/2005
  • Status: Active Grant
First Claim
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1. A power supply for providing alternating current (AC) and direct current (DC) to a plurality of loads, the power supply comprising:

  • a transformer having first, second, third and fourth windings;

    an AC input for receiving AC power from an external source, the AC input connected across the first winding through a backfeed relay;

    an AC output connected across the first winding and connected to the AC input through the backfeed relay;

    an inverter connected across the second winding;

    a pair of battery terminals connected between the inverter and a center tap of the second winding;

    a charger connected across the third winding, the charger coupled to the pair of battery terminals;

    a rectifier connected across the fourth winding;

    a DC output connected to the rectifier through a DC/DC regulator; and

    ,a controller coupled to the AC input, the backfeed relay, the inverter and the charger,wherein when AC power is received at the AC input the power supply operates in a normal mode wherein the controller closes the backfeed relay such that;

    the AC output receives AC power from the AC input through the backfeed relay;

    the rectifier receives AC power from the AC input through the backfeed relay and the transformer; and

    ,the DC output receives DC power from the rectifier through the DC/DC regulator,and when AC power is not received at the AC input the power supply operates in a backup mode wherein the controller opens the backfeed relay and causes the inverter to operate in push-pull fashion such that;

    DC power received at the pair of battery terminals is converted to AC power and provided to the second winding through the inverter;

    the AC output receives AC power through the transformer;

    the rectifier receives AC power through the transformer; and

    ,the DC output receives DC power from the rectifier through the DC/DC regulator.

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