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Isolating system that couples fieldbus data to a network

  • US 7,421,531 B2
  • Filed: 01/12/2005
  • Issued: 09/02/2008
  • Est. Priority Date: 01/12/2005
  • Status: Active Grant
First Claim
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1. A system for coupling data received in fieldbus format from a fieldbus interface to a network connection, comprising:

  • a data format converter coupled between the fieldbus interface and a bridge USB interface, the converter convening the data to USB-formatted data;

    a coupler coupled in cascade with the converter, and including a first insulating barrier;

    a host that receives the USB-formatted data, and that includes a data server interface presenting the data to the network connection; and

    a regulator coupling the power to the fieldbus interface to thereby power the fieldbus interface, the regulator including a DC-to-DC converter having a second insulating barrier such that data and power are isolatingly coupled between the fieldbus interface and the bridge USB interface;

    the regulator including a power limiter circuit that;

    detects whether fieldbus power is valid, and turns off the DC-to-DC converter if the fieldbus power is detected to be valid, and turns on the DC-to-DC converter if the fieldbus power is detected to be not valid; and

    detects whether there is current flow and turns off the fieldbus power if there is no current flow, and turns off the DC-to-DC converter and turns on the fieldbus power on if there is current flow.

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