# US 9,520,226 B2 · Counter wound inductive power supply > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,226 B2 - Document ID: US9520226B2 - Status: Granted - Kind: B2 - Application number: 13/441,207 - Filed: 2012-04-06 - Published: 2013-04-18 - Granted: 2016-12-13 - Earliest claimed: 2011-04-08 - Assignees: Access Business Group International LLC - Applicants: Matthew J. Norconk; Joshua K. Schwannecke; David W. Baarman; Neil W. Kuyvenhoven; Benjamin C. Moes; Colin J. Moore - Inventors: Matthew J. Norconk; Joshua K. Schwannecke; David W. Baarman; Neil W. Kuyvenhoven; Benjamin C. Moes; Colin J. Moore - Web page: https://patentgrep.com/patent/US9520226B2 ## CPC - B60L 50/40: using propulsion power supplied by capacitors - B60L 50/52: characterised by DC-motors - B60L 53/122: Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil - B60L 53/126: Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver - B60L 53/36: by positioning the vehicle - H01F 38/14: Inductive couplings - H04B 5/263: {Multiple coils at either side} - H04B 5/79: for data transfer in combination with power transfer - B60L 2200/20: Vehicles specially adapted for children, e.g. toy vehicles - B60L 2210/30: AC to DC converters - B60L 2210/40: DC to AC converters - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - 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 10/72: Electric energy management in electromobility - Y02T 90/12: Electric charging stations - Y02T 90/14: Plug-in electric vehicles - 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 - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H04B: TRANSMISSION - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A contactless power supply is provided. The contactless power supply includes two or more primary coils for generating a region of cooperative magnetic flux generally therebetween. A portable device having a secondary coil can be positioned proximate this region of magnetic flux to receive wireless power from the contactless power supply. The spaced-apart primary coils can be wound in alternating directions about a common axis and driven in phase, or can be wound in a single direction about a common axis and driven approximately 180 degrees out of phase. The contactless power supply can include a plurality of primary coils in an adjustable array to accommodate multiple portable devices each with different secondary configurations and power consumption needs. ## Claims ### Claim 1 A contactless power supply comprising: a power transfer surface to receive at least one remote device thereon, wherein the remote device includes an inductive secondary defining a centerline axis generally perpendicular to the power transfer surface; a first primary coil array subjacent the power transfer surface and including a plurality of spaced-apart inductive primaries each being wound about an axis generally parallel to the power transfer surface such that the plurality of spaced-apart inductive primaries are co-axial; and a power supply electrically connected to each of the plurality of inductive primaries, wherein the power supply is operable to selectively drive a first two of the plurality of inductive primaries to define a first region of cooperative electromagnetic flux between the first two of the plurality of inductive primaries and operable to selectively drive a second two of the plurality of inductive primaries to define a second region of cooperative electromagnetic flux between the second two of the plurality of inductive primaries. ### Claim 2 (depends on 1) The contactless power supply of claim 1 wherein: the first two of the inductive primaries are wound in a common direction; the power supply is operable to drive the first two of the plurality of inductive primaries substantially out of phase; the second two of the inductive primaries are wound in a common direction; and the power supply is operable to drive the second two of the plurality of inductive primaries substantially out of phase. ### Claim 3 (depends on 1) The contactless power supply of claim 1 wherein: the first two of the plurality of inductive primaries are separated by a first distance; and the second two of the plurality of inductive primaries are separated by a second distance different from the first distance. ### Claim 4 (depends on 1) The contactless power supply of claim 1 wherein the power supply is operable to monitor a characteristic of power in the plurality of inductive primaries to detect the presence of a remote device in proximity to the first primary coil array. ### Claim 5 (depends on 1) The contactless power supply of claim 1 further including a second primary coil array subjacent the power transfer surface including a plurality of spaced-apart inductive primaries each being wound about an axis generally orthogonal to the first primary coil array. ### Claim 6 (depends on 1) The contactless power supply of claim 1 wherein the power supply includes a driver and a switching circuit for simultaneously driving at least two of the plurality of inductive primaries substantially out of phase. ### Claim 7 (depends on 1) The contactless power supply of claim 1 wherein the power supply includes first and second drivers for simultaneously driving at least two of the plurality of inductive primaries substantially out of phase. ### Claim 8 (depends on 1) The contactless power supply of claim 1 wherein the first primary coil array includes a ferromagnetic core element. ### Claim 9 (depends on 1) The contactless power supply of claim 1 wherein the first primary coil array includes a substantially planar bobbin. ### Claim 10 (depends on 1) The contactless power supply of claim 1 wherein: the first two of the inductive primaries are wound in opposite directions; the power supply is operable to drive the first two of the plurality of inductive primaries substantially in phase; the second two of the inductive primaries are wound in opposite directions; and the power supply is operable to drive the second two of the plurality of inductive primaries substantially in phase.