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Capacitor Sharing Surge Protection Circuit

  • US 20100128407A1
  • Filed: 01/28/2010
  • Published: 05/27/2010
  • Est. Priority Date: 12/21/2007
  • Status: Active Grant
First Claim
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1. A data switch for use in a Power over Ethernet (PoE) communications system, comprising:

  • a plurality of Ethernet ports configured to communicate data and power between powered devices; and

    a protection circuit, comprising;

    a positive diode array comprising a first plurality of diodes that each include a cathode and an anode, wherein each anode of the first plurality of diodes is coupled to a single one of the plurality of Ethernet ports;

    a positive surge bus coupled between the cathodes of the first plurality of diodes and a bulk capacitor;

    a negative diode array comprising a second plurality of diodes that each include a cathode and an anode, wherein each cathode of the second plurality of diodes is coupled to a single one of the plurality of Ethernet ports; and

    a negative surge bus coupled between the anodes of the second plurality of diodes and ground.

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