# US 11,908,616 B2 · Coil unit for inductively charging a vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,616 B2 - Document ID: US11908616B2 - Status: Granted - Kind: B2 - Application number: 16/375,970 - Filed: 2019-04-05 - Published: 2019-08-01 - Granted: 2024-02-20 - Earliest claimed: 2016-10-07 - Assignees: Bayerische Motoren Werke Aktiengesellschaft - Applicants: Bayerische Motoren Werke Aktiengesellschaft - Inventors: Josef Krammer; Florian Niedermeier - Web page: https://patentgrep.com/patent/US11908616B2 ## CPC - H01F 38/14: Inductive couplings - B60L 53/12: Inductive energy transfer - B60L 53/30: Constructional details of charging stations - B60L 53/31: Charging columns specially adapted for electric vehicles - H01F 27/24: Magnetic cores - H01F 27/255: made from particles (H01F27/26 takes precedence) - H01F 27/38: Auxiliary core members; Auxiliary coils or windings - 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 90/12: Electric charging stations - Y02T 90/14: Plug-in electric vehicles - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - 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 coil unit for inductively charging a vehicle is provided. The coil unit includes a coil, wherein the coil includes multiple windings of at least two electric lines. The electric lines are connected in parallel. Each of the electric lines has a respective winding part, in which the windings are formed, and an additional part, in which an additional inductor unit having a predefined electric inductance is arranged. ## Claims ### Claim 1 A coil unit for inductively charging a vehicle, comprising: a coil, wherein the coil comprises a plurality of windings of at least two electrical lines, wherein the at least two electrical lines are connected in parallel, each of the at least two electrical lines has a respective winding part and an additional part in which an additional inductance unit is arranged that has a prescribed electrical inductance that is 0.02 times, 0.04 times, 0.06 times, or 0.08 times an electrical inductance of each of the at least two electrical lines in the respective winding part, the at least two electrical lines are litz wires, and the additional inductance units of the at least two electrical lines have a common ferrite, but are oppositely wound. ### Claim 2 (depends on 1) The coil unit according to claim 1, wherein a number of electrical lines is two and the additional inductance units of the at least two electrical lines are oppositely coupled. ### Claim 3 (depends on 1) The coil unit according to claim 1, wherein the additional inductance unit is formed as a separate component. ### Claim 4 (depends on 1) The coil unit according to claim 1, wherein the additional inductance unit is formed by winding the respective electrical line so as to form an additional coil. ### Claim 5 (depends on 4) The coil unit according to claim 4, wherein the additional coils of the at least two electrical lines are wound around a common ferrite. ### Claim 6 (depends on 4) The coil unit according to claim 4, further comprising: a carrier body that has a number of ferrites that corresponds to a number of electrical lines, wherein a magnetically neutral carrier is in each case arranged between the number of ferrites and the additional coils of the electrical lines and each of the additional coils of the number of electrical lines wound around the respective ferrite. ### Claim 7 (depends on 1) The coil unit according to claim 1, wherein a number of electrical lines is two and electrical inductances of the two additional inductance units are prescribed such that it holds true that L_S1+L1=L_S2+L2, wherein L1 is an inductance of a first of the two additional inductance units, L2 is an inductance of a second of the two additional inductance units, L_S1 is an inductance in the winding part of an electrical line that has the first of the two additional inductance units and L_S2 is an inductance in the winding part of an electrical line that has the second of the two additional inductance units.