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System and method for high voltage protection of powered devices

  • US 20070263333A1
  • Filed: 06/23/2006
  • Published: 11/15/2007
  • Est. Priority Date: 05/11/2006
  • Status: Active Grant
First Claim
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1. A powered device comprising:

  • a rectifier circuit having two inputs to receive an input voltage from a powered network and having two output terminals to provide a rectified power supply voltage in response to the input voltage;

    a logic circuit coupled between the two inputs and adapted to receive data from the powered network; and

    a power protection element coupled between the two output terminals to protect to the logic circuitry from high power transients, wherein, in a first mode of operation, the power protection element presents a high impedance to the two output terminals, in a second mode of operation, the power protection element has a first power protection characteristic, and in a third mode of operation, the voltage protection element has a second power protection characteristic.

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