Magnetic flux cancellation for power line communications
AssigneeSolaredge Technologies Ltd.
InventorsMichael Manelis, Gil Litmanovitch, David Braginsky
Life of this patent
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Abstract
An apparatus comprising a signal transformer coupled to a power line and a signal transmission, reception, or detection circuit. A sensor is configured to be responsive to the power line current or magnetic flux generated in a ferrite core of the signal transformer. When the sensor indicates that the flux generated by the power line current mat cause an attenuation of the signal strength, a second circuit generates a current through a flux cancelling winding that cancels at least some of the flux generated by the power line current.
Claims20
An apparatus comprising:
- a core;
- a plurality of first windings inductively coupled with the core, wherein the plurality of first windings are each configured to connect to a power line of a power generation system;
- a second winding inductively coupled with the core;
- a sensor configured to measure a current produced in the power line;
- and
- a circuit connected to the second winding and the sensor, wherein the circuit is configured to monitor a sensor value of the sensor and apply, based on comparing a monitored sensor value to a reference value, a current to the second winding, wherein the current to the second winding is configured to produce a cancelling magnetic flux that cancels at least in part a magnetic flux produced in the core by the plurality of first windings, wherein each of the plurality of first windings apply the magnetic flux to the core in a same orientation.
A method comprising:
- monitoring a sensor value of a power line, wherein the sensor value represents a current in the power line, and wherein a magnetic flux is induced in a same orientation in a core by a plurality of first windings connected to the power line and inductively coupled with the core;
- applying, using a second winding inductively coupled with the core, a cancelling magnetic flux based on a comparison of the sensor value to a reference value, wherein the second winding inductively coupled with the core generates the cancelling magnetic flux to cancel at least in part the magnetic flux in the core induced by the plurality of first windings;
- and
- adjusting, based on the comparison of the sensor value to the reference value, a flux cancelling current applied to the second winding inductively coupled with the core.
A method comprising:
- disabling a power line current in a power line inductively coupled to a core, wherein the power line current comprises a direct current;
- sending a signal over the power line;
- computing a sensor signal value associated with the signal;
- storing the sensor signal value as a reference value;
- retrieving the reference value;
- and
- generating a cancelling magnetic flux in the core, using a current flowing through a plurality of first windings inductively coupled to the core, wherein the current is based on a comparison of a new signal value to the reference value, wherein each of the plurality of first windings apply the cancelling magnetic flux to the core in a same orientation.
Dependencies are inferred from the claim text.