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Backup energy storage module with selectable charge storage elements for providing backup power to a load

  • US 9,143,005 B1
  • Filed: 12/21/2012
  • Issued: 09/22/2015
  • Est. Priority Date: 12/21/2012
  • Status: Active Grant
First Claim
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1. A backup energy storage module comprising:

  • a plurality of charge storage elements, each charge storage element operable to be charged to a backup voltage; and

    control circuitry operable to;

    monitor a supply voltage that provides power to a load;

    determine when the supply voltage falls below a threshold level;

    select a first charge storage element to provide power to the load;

    determine when the backup voltage on the first charge storage element falls to a reference level; and

    select a second charge storage element to provide power to the load if the supply voltage remains below the threshold level.

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