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Redundant power supply switchover circuit

  • US 5,894,413 A
  • Filed: 01/28/1997
  • Issued: 04/13/1999
  • Est. Priority Date: 01/28/1997
  • Status: Expired due to Term
First Claim
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1. A power supply system for an in-flight entertainment system, that supplies power to a load, comprising:

  • a first power supply and a second power supply each having a first output terminal and a second output terminal, said first power supply delivering a majority portion of required power to the load when functional, said first power supply operating in one of a remote sense mode and a local sense mode;

    a monitor coupled to the first output terminal of said first power supply, said monitor for monitoring a supply voltage of said first power supply, said monitor generating a first signal and a second signal according to an operational condition of said first power supply;

    a first diode and a second diode, each having a first terminal and a second terminal, the first terminal of said first diode being coupled to said monitor, the second terminal of said first diode being coupled to a load, the first terminal of said second diode being coupled to the first output terminal of said second power supply, the second terminal of said second diode being coupled to the load;

    a switch coupled to said monitor, said switch having a first position for coupling said second output terminal of said first power supply to the load in response to the first signal from said monitor, said switch having a second position for coupling said second output terminal of said second power supply to the load in response to the second signal from said monitor; and

    a charging element coupled across the load for storing energy from the first power supply, said charging element providing stored energy to the load when the load is switched from the first power supply to the second power supply.

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