# US 10,873,213 B2 · Wireless power transfer pad with ferrite pyramid-shaped chimney > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,213 B2 - Document ID: US10873213B2 - Status: Granted - Kind: B2 - Application number: 16/124,035 - Filed: 2018-09-06 - Published: 2019-03-07 - Granted: 2020-12-22 - Earliest claimed: 2017-09-06 - Assignees: Wireless Advanced Vehicle Electrification, Inc. - Applicants: Wireless Advanced Vehicle Electrification, Inc. - Inventors: Patrice Lethellier - Web page: https://patentgrep.com/patent/US10873213B2 ## CPC - H01F 38/14: Inductive couplings - H01F 27/24: Magnetic cores - H01F 27/255: made from particles (H01F27/26 takes precedence) - H01F 27/28: Coils; Windings; Conductive connections - H01F 27/2871: {Pancake coils} - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/366: {made of ferromagnetic material} - H01F 27/40: Structural association with built-in electric component, e.g. fuse - H02J 7/70: characterised by the mechanical construction - H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices} - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - B60L 53/12: Inductive energy transfer - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/14: Plug-in electric vehicles - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A wireless power transfer (“WPT”) pad with a pyramid-shaped ferrite chimney is disclosed. The WPT pad includes a winding comprising a conductor where the conductor is wound in a planar configuration. The winding includes a center point about which the winding is wound. The WPT pad includes a ferrite structure that includes a parallel section located on a side of the winding with at least a portion in parallel with the winding and a chimney section in magnetic contact with the parallel section and located at the center point of the winding. The chimney section extends perpendicular to the parallel section. ## Claims ### Claim 1 A wireless power transfer (“WPT”) pad comprising: a winding comprising a conductor, wherein the conductor is wound in a planar configuration, the winding comprising a center point about which the winding is wound; and a ferrite structure comprising: a parallel section located on a side of the winding with at least a portion in parallel with the winding; and a chimney section in magnetic contact with the parallel section and located at the center point of the winding, the chimney section extending perpendicular to the parallel section, wherein the chimney section extends in a direction from the parallel section toward the winding, the chimney section comprising a top distal to the parallel section and sides between the top and the parallel section and wherein the sides of the chimney section comprise a slope wherein each side is wider at the parallel section than at the top of the chimney section and each side of the chimney section is continuous from the parallel section to the top. ### Claim 2 (depends on 1) The WPT pad of claim 1, wherein the slope of the sides is chosen to accommodate an expected amount of magnetic flux from the parallel section through the chimney section and through the top wherein the slope accommodates the expected amount of magnetic flux without saturation of the chimney section. ### Claim 3 (depends on 1) The WPT pad of claim 1, wherein the top comprises a width sized to accommodate an expected magnetic flux through the top without saturation of the chimney section. ### Claim 4 (depends on 1) The WPT pad of claim 1, wherein the chimney section extends away from the parallel section a distance at least a thickness of the winding, the thickness measured in a direction perpendicular to the parallel section of the ferrite structure. ### Claim 5 (depends on 4) The WPT pad of claim 4, wherein the chimney section extends a distance beyond the thickness of the winding. ### Claim 6 (depends on 1) The WPT pad of claim 1, wherein the chimney section is positioned within a center section of the winding. ### Claim 7 (depends on 1) The WPT pad of claim 1, wherein the ferrite structure further comprises an exterior section located exterior to an outside edge of the winding, the outside edge distal to the chimney section, wherein the exterior section is in magnetic contact with the parallel section and extends perpendicular to the parallel section. ### Claim 8 (depends on 7) The WPT pad of claim 7, wherein the exterior section extends in a direction from the parallel section toward the winding and a distance at least a thickness of the winding, the thickness measured in a direction perpendicular to the ferrite structure. ### Claim 9 (depends on 1) The WPT pad of claim 1, wherein an end of the winding is located at an exterior edge of a center section about the center point and is wound in a circular pattern that expands from the center point within the center section, wherein each succeeding lap of the winding is external to a previous lap of the winding. ### Claim 10 (depends on 9) The WPT pad of claim 9, wherein each lap of the winding is within a same plane, the plane parallel to the parallel section of the ferrite structure. ### Claim 11 (depends on 1) The WPT pad of claim 1, wherein the WPT pad comprises two or more windings, wherein each winding comprises a parallel section of a ferrite structure associated with the winding and a center section, each center section comprising a chimney section of the ferrite structure associated with the winding. ### Claim 12 (depends on 11) The WPT pad of claim 11, wherein the ferrite structures of each of the two or more windings are adjacent to each other and are magnetically coupled. ### Claim 13 (depends on 1) The WPT pad of claim 1, wherein the WPT pad is configured to couple with an opposing WPT pad, wherein the WPT pad is one of a transmitter pad that transmits power wirelessly to an opposing WPT pad that is a secondary pad and secondary pad that receives power wirelessly from an opposing WPT pad that is a transmitter pad. ### Claim 14 (depends on 13) The WPT pad of claim 13, wherein the opposing WPT pad comprises a center section and a chimney section on each side of the center section adjacent to a winding of the opposing WPT pad. ### Claim 15 (depends on 1) The WPT pad of claim 1, wherein the WPT pad is part of a wireless power transfer system that transfers power wirelessly to a vehicle. ### Claim 16 A wireless power transfer (“WPT”) pad comprising: a winding comprising a conductor, wherein the conductor is wound in a planar configuration, the winding comprising a center point about which the winding is wound; and a ferrite structure comprising: a parallel section located on a side of the winding with at least a portion in parallel with the winding; a chimney section in magnetic contact with the parallel section and located at the center point of the winding, the chimney section extending perpendicular to the parallel section, wherein the chimney section extends in a direction from the parallel section toward the winding, the chimney section comprising a top distal to the parallel section and sides between the top and the parallel section, the sides of the chimney section comprising a slope wherein each side is wider at the parallel section than at the top of the chimney section and each side of the chimney section is continuous from the parallel section to the top; and an exterior section located exterior to an outside edge of the winding, the outside edge distal to the chimney section, wherein the exterior section is in magnetic contact with the parallel section and extends perpendicular to the parallel section. ### Claim 17 (depends on 16) The WPT pad of claim 16, wherein the chimney section and the exterior section each extend away from the parallel section a distance at least a thickness of the winding, the thickness measured in a direction perpendicular to the parallel section of the ferrite structure. ### Claim 18 A wireless power transfer (“WPT”) system comprising: a resonant converter that receives power from a power source; and a WPT pad connected to the resonant converter, the WPT pad receiving power from the resonant converter, the WPT pad comprising: a winding comprising a conductor, wherein the conductor is wound in a planar configuration, the winding comprising a center point about which the winding is wound; and a ferrite structure comprising a parallel section located on a side of the winding with at least a portion in parallel with the winding, and a chimney section in magnetic contact with the parallel section and located at the center point of the winding, the chimney section extending perpendicular to the parallel section, wherein the chimney section extends in a direction from the parallel section toward the winding, the chimney section comprising a top distal to the parallel section and sides between the top and the parallel section and wherein the sides of the chimney section comprise a slope wherein each side is wider at the parallel section than at the top of the chimney section and each side is continuous from the parallel section to the top.