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Dual input AC/DC/ battery operated power supply

  • US 6,751,109 B2
  • Filed: 05/31/2002
  • Issued: 06/15/2004
  • Est. Priority Date: 10/31/2001
  • Status: Expired due to Fees
First Claim
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1. A power converter, comprising:

  • a power supply circuit providing a regulated DC output voltage and having first and second circuits, said power supply circuit receiving an AC input voltage and a DC input voltage at respective said first and second circuits and providing, in response thereto, a DC output voltage at a first node; and

    a storage circuit coupled to said power supply circuit, said storage circuit storing a secondary DC input voltage, wherein said storage circuit automatically delivers said secondary DC input voltage to a said power supply circuit only in response to said AC and DC input voltages being temporarily removed to generate the regulated DC output voltage being sufficient to power a portable device.

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