High current inductive coupler and current transformer for power lines
First Claim
1. A power line data coupler, comprising:
- a magnetic core having a high magnetic permeability at a data communication frequency and being configured to allow a power line of a power distribution system to be routed through said magnetic core to serve as a primary winding;
a data signaling circuit that provides a secondary winding through said magnetic core for coupling a data signal between said power line and a communication device; and
a choke coil coupled to said data signaling circuit, across said secondary winding, for creating a flux-canceling power frequency current opposite in direction and comparable in magnitude to a power frequency current.
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Accused Products
Abstract
There is provided an inductive power line data coupler. The coupler includes (a) a magnetic core having a high magnetic permeability at a data communication frequency and being configured to allow a power line of a power distribution system to be routed through the magnetic core to serve as a primary winding, (b) a data signaling circuit that provides a secondary winding through the magnetic core for coupling a data signal between the power line and a communication device, and (c) a choke coil coupled to the data signaling circuit for creating a flux-canceling power frequency current opposite in direction and comparable in magnitude to a power frequency current. The coupler may also include a circuit for sensing a level of current in the power line.
236 Citations
25 Claims
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1. A power line data coupler, comprising:
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a magnetic core having a high magnetic permeability at a data communication frequency and being configured to allow a power line of a power distribution system to be routed through said magnetic core to serve as a primary winding; a data signaling circuit that provides a secondary winding through said magnetic core for coupling a data signal between said power line and a communication device; and a choke coil coupled to said data signaling circuit, across said secondary winding, for creating a flux-canceling power frequency current opposite in direction and comparable in magnitude to a power frequency current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A power line data coupler, comprising:
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a magnetic core having a high magnetic permeability at a data communication frequency and being configured to allow a power line of a power distribution system to be routed through said magnetic core to serve as a primary winding; a data signaling circuit that provides a secondary winding through said magnetic core for coupling a data signal between said power line and a communication device; and a flux-canceling circuit that includes a tertiary winding through said magnetic core and a choke coil across said tertiary winding, for creating a flux-canceling power frequency current opposite in direction and comparable in magnitude to a power frequency current. - View Dependent Claims (17, 18, 19)
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20. A system of sensing current on a power distribution system power line, the system comprising:
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a first current transformer that utilizes a power line of a power distribution system as a primary winding and a secondary winding connected to a choke coil, such that current in said choke coil is proportional to power current in said power line; and a second current transformer having a conductor of said choke coil as a primary winding and developing in a secondary winding circuit a current sensing signal proportional to said power current. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification