# US 11,121,581 B2 · Voltage and current compensation in an inductive power transfer unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,581 B2 - Document ID: US11121581B2 - Status: Granted - Kind: B2 - Application number: 15/768,321 - Filed: 2016-10-17 - Published: 2018-11-15 - Granted: 2021-09-14 - Earliest claimed: 2015-10-16 - Assignees: Bombardier Primove GmbH - Applicants: Bombardier Primove GmbH - Inventors: Robert Czainski; Stephan Bolz - Web page: https://patentgrep.com/patent/US11121581B2 ## CPC - H01F 38/14: Inductive couplings - H01F 27/28: Coils; Windings; Conductive connections - H01Q 1/248: {provided with an AC/DC converting device, e.g. rectennas} - H01Q 7/06: with core of ferromagnetic material (H01Q7/02 takes precedence) - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - H02J 50/90: involving detection or optimisation of position, e.g. alignment - H04B 5/24: Inductive coupling - H04B 5/79: for data transfer in combination with power transfer - H01F 2038/143: {for signals} - Y02T 90/12: Electric charging stations - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An inductive power transfer unit includes a winding unit for inductive power transfer during a power transfer operation, a flux guide, and an antenna. The antenna is arranged with the flux guide for generating or receiving an antenna signal during an auxiliary operation, wherein a compensation winding is arranged, such that the compensation winding compensates for an induced voltage and/or induced current in the antenna guide during the power transfer operation. ## Claims ### Claim 1 An inductive power transfer unit, comprising: a winding unit for inductive power transfer during a power transfer operation, flux guiding means, and an antenna element, wherein: the antenna element is arranged with the flux guiding means for generating or receiving an antenna signal during an auxiliary operation, and wherein a compensation element is arranged, such that the compensation element compensates for an induced voltage and/or induced current in the antenna element during the power transfer operation. ### Claim 2 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element is wound around the flux guiding means for generating or receiving an antenna signal during the auxiliary operation. ### Claim 3 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element is wound around the flux guiding element in a first winding direction, wherein the compensation element is wound around the flux guiding means in a second winding direction around the flux guiding means, wherein the first winding direction and the second winding direction are opposite directions around the flux guiding means, such that the compensation element compensates for an induced voltage and/or induced current in the antenna element during the power transfer operation. ### Claim 4 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element is wound around the flux guiding element in a first winding direction, wherein the compensation element is wound around the flux guiding means in a second winding direction around the flux guiding means, wherein the first winding direction and the second winding direction are the same direction around the flux guiding means, and wherein the antenna element and the compensation element are electrically connected in such a way, that the compensation antenna element compensates for an induced voltage and/or induced current in the antenna element during the power transfer operation. ### Claim 5 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element is wound around the flux guiding means at a first location of the flux guiding means and the compensation element is wound around the flux guiding means at a second location of the flux guiding means distanced to the first location, and wherein during the power transfer operation a value of a magnetic flux through the flux guiding means at the first location is lower than a value of the magnetic flux through the flux guiding means at the second location. ### Claim 6 (depends on 1) The inductive power transfer unit according to claim 1, wherein the number of turns of the antenna element is larger than the number of turns of the compensation element. ### Claim 7 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element and the compensation element are arranged such that the amplitude value of the antenna signal received or transmitted by the antenna element is larger than the amplitude value of the antenna signal received by the compensation element. ### Claim 8 (depends on 1) The inductive power transfer unit according to claim 1, wherein the compensation element has a magnetic axis and with regard to its magnetic axis is arranged perpendicular to the direction of the magnetic flux density vector of the antenna signal. ### Claim 9 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element and the compensation element each have a magnetic axis and with regard to their magnetic axes are arranged perpendicular to each other. ### Claim 10 (depends on 1) The inductive power transfer unit according to claim 1, wherein the sensor antenna element is a transmitting antenna element. ### Claim 11 (depends on 1) The inductive power transfer unit according to claim 1, wherein the antenna element is a receiving antenna element. ### Claim 12 (depends on 1) The inductive power transfer unit according to claim 1, wherein the flux guiding means has a permeability μr between 1 and 500000.