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Power supply and method that maintains supply voltage in communications systems during a power supply interruption

  • US 8,247,924 B1
  • Filed: 01/04/2010
  • Issued: 08/21/2012
  • Est. Priority Date: 01/04/2010
  • Status: Active Grant
First Claim
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1. A power supply comprising:

  • a power supply converter having a power output and configured to provide a supply voltage through the power output to a communications device; and

    a boost circuit connected to the power supply converter in parallel and isolated from the power supply converter'"'"'s bulk input capacitance during normal operation and further comprising at least one power storage circuit and charging circuit connected thereto and configured to charge and maintain the power storage circuit to a predetermined voltage and switch the power storage circuit into the power supply converter during an undervoltage condition to transfer the stored power from the power storage circuit to the power supply converter and maintain the supply voltage to the communications device connected thereto for a required hold-up time, wherein said power supply converter further comprises a circuit connected to the boost circuit and configured to generate a signal as a switching stimulus to the boost circuit to drive the boost circuit.

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