Inductive coupling of a data signal to a power transmission cable

Abstract

There is provided an apparatus for enabling communication of a data signal via a power transmission cable. The apparatus comprises (a) a first winding for coupling the data signal via a conductor of the power transmission cable, and (b) a second winding, inductively coupled to the first winding, for coupling the data signal via a data port.

Description

[0001] The present application is claiming priority of U.S. Provisional Patent Application Serial No. 60 / 173,808, filed on Dec. 30, 1999, and Serial No. 60 / 198,671, filed on Apr. 20, 2000.[0002] 1. Field of the Invention[0003] The present invention relates to communication of a data signal over a power distribution system, and more particularly, to a use of an inductive coupler for coupling a data signal via a conductor in a power transmission cable.[0004] 2. Description of the Prior Art[0005] Low voltage (LV) power lines within the confines of a home or business have been used as a medium for point to point or network communications using so called "carrier" systems in which a data signal is modulated onto a high frequency (HF) carrier and transmitted over the power lines. Internet access, which requires "last mile" connectivity between the Internet data trunk and each domicile, would greatly enhance the utility of such networks.[0006] A medium voltage (MV) typically 4-66 kV is red...

AI Technical Summary

Benefits of technology

The inductive coupler system enables cost-effective, high data rate communication over power transmission cables without service interruptions, using passive components with virtually unlimited service life and minimizing electromagnetic radiation and noise interference.

Problems solved by technology

If data is present on the medium voltage power grid, it would be desirable to couple broadband data streams from transformer substations to entire sections of a neighborhood, but the distribution transformers effectively block high frequency energy and thus block the data from getting to the LV drop lines.

For such a small number of potential users, it is not economical to procure an expensive high data rate feed, such as fiber or T1, and couple it via power line communications devices to the low voltage side of the transformer.

Such devices are thus expensive, bulky, and have an impact on overall power grid reliability.

Furthermore, in some cases, during their installation they require disconnecting power from the customers.

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