High current inductive coupler and current transformer for power lines
AssigneeAmbient Corporation
InventorYehuda Cern
Life of this patent
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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.
Claims25
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.
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 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.
A system of sensing current on a power distribution system power line, the system comprising:
- 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.
Dependencies are inferred from the claim text.