# US 10,771,033 B2 · Electrical feed line integrated filtering for inductive power transfer systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,033 B2 - Document ID: US10771033B2 - Status: Granted - Kind: B2 - Application number: 16/011,845 - Filed: 2018-06-19 - Published: 2019-12-19 - Granted: 2020-09-08 - Earliest claimed: 2018-06-19 - Assignees: WiTricity Corporation - Applicants: WiTricity Corporation - Inventors: Prasanth Venugopal; Martin Pavlovsky; Nicholas Athol Keeling; Stefan Raabe; Daniel Kuerschner; Roman Heinrich; Simon Islinger - Web page: https://patentgrep.com/patent/US10771033B2 ## CPC - H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)} - B60L 53/12: Inductive energy transfer - B60L 53/122: Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02M 1/126: {using passive filters} - B60L 53/20: characterised by converters located in the vehicle - 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 - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - 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 - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Certain aspects of the present disclosure are generally directed to apparatus for attenuating unwanted frequencies using a feed line with integrated filtering. In certain aspects, a feed line for filtering unwanted frequencies in a wireless power transfer system is provided, the feed line including a first end, wherein the first end is configured to connect to a power source that generates a driving signal having a driving signal frequency, and a second end, wherein the second end is configured to connect to a wireless power transfer element configured to wirelessly transmit power. The feed line further includes a conductor core, wherein the conductor core is configured to transfer the driving signal from the power source to the wireless transfer element. The feed line further includes an integrated filter configured to attenuate at least one frequency generated by the wireless power transfer system. ## Claims ### Claim 1 A feed line for filtering unwanted frequencies in a wireless power transfer system, the feed line comprising: a feed line for filtering unwanted frequencies in a wireless power transfer system, the feed line comprising: a first end, wherein the first end is configured to connect to a power source that generates a driving signal having a driving signal frequency; a second end, wherein the second end is configured to connect to a wireless power transfer element configured to wirelessly transmit power; at least one conductor core, wherein the conductor core is configured to transfer the driving signal from the power source to the wireless power transfer element; an integrated filter configured to attenuate at least one frequency generated by the wireless power transfer system, wherein the integrated filter comprises at least one inductor and at least one capacitor; and a plurality of segments comprising a first segment and a second segment, wherein the first segment comprises the integrated filter, and wherein the second segment comprises a second integrated filter configured to attenuate at least one second frequency generated by the wireless power transfer system, wherein the second integrated filter comprises a second inductor and a second capacitor. ### Claim 2 (depends on 1) The feed line of claim 1, wherein the at least one inductor comprises the at least one conductor core. ### Claim 3 (depends on 2) The feed line of claim 2, wherein the at least one inductor further comprises a second inductor, wherein the second inductor is a ferromagnetic material. ### Claim 4 (depends on 1) The feed line of claim 1, wherein the at least one frequency is at least one harmonic of the driving signal frequency. ### Claim 5 (depends on 1) The feed line of claim 1, wherein the inductor and the capacitor comprise a Pi filter. ### Claim 6 (depends on 1) The feed line of claim 1, wherein the at least one capacitor is located at one of the first end or the second end. ### Claim 7 (depends on 1) The feed line of claim 1, wherein the at least one capacitor comprises a capacitor at the first end and a capacitor at the second end. ### Claim 8 (depends on 1) The feed line of claim 1, wherein the at least one capacitor comprises a dielectric material, wherein the at least one inductor comprises the at least one conductor core, and wherein the at least one conductor core passes through the dielectric material. ### Claim 9 (depends on 1) The feed line of claim 1, wherein attenuating the at least one second frequency generated by the wireless power transfer system and attenuating the at least one frequency generated by the wireless power transfer system are both attenuating the same frequency. ### Claim 10 A wireless power transmitter system for filtering unwanted frequencies in a wireless power transfer system, the wireless power transmitter comprising: a power source that generates a driving signal having a driving signal frequency; and a feed line connected to the power source at a first end, the feed line comprising: at least one conductor core; an integrated filter configured to attenuate at least one frequency generated by the wireless power transfer system when a wireless power transfer element is coupled to a second end of the feed line, wherein the integrated filter comprises at least one inductor and at least one capacitor; and a plurality of segments including: a first segment comprising the integrated filter, and a second segment comprising a second integrated filter configured to attenuate at least one second frequency generated by the wireless power transfer system, wherein the second integrated filter comprises a second inductor and a second capacitor. ### Claim 11 (depends on 10) A wireless power transmitter system of claim 10, wherein the at least one inductor comprises the at least one conductor core. ### Claim 12 (depends on 10) A wireless power transmitter system of claim 10, wherein the inductor and the capacitor comprise a Pi filter. ### Claim 13 (depends on 10) A wireless power transmitter system of claim 10, wherein the at least one capacitor comprises a dielectric material, wherein the at least one inductor comprises the at least one conductor core, and wherein the at least one conductor core passes through the dielectric material. ### Claim 14 (depends on 10) A wireless power transmitter system of claim 10, wherein the at least one capacitor comprises a capacitor at the first end. ### Claim 15 (depends on 10) A wireless power transmitter system of claim 10, wherein the at least one capacitor comprises a capacitor at the second end. ### Claim 16 A wireless power receiver system for filtering unwanted frequencies in a wireless power transfer system, the wireless power receiver system comprising: a wireless power transfer element configured to wirelessly transmit power when driven by a power source that generates a driving signal having a driving signal frequency; and a feed line connected to the wireless power transfer element at a first end, the feed line comprising: at least one conductor core; an integrated filter configured to attenuate at least one frequency generated by the wireless power transfer system, wherein the integrated filter comprises a first inductor and a first capacitor; and a plurality of segments including: a first segment comprising the integrated filter; and a second segment comprising a second integrated filter configured to attenuate at least one second frequency generated by the wireless power transfer system, wherein the second integrated filter comprises a second inductor and a second capacitor. ### Claim 17 (depends on 16) A wireless power receiver system of claim 16, wherein the first inductor comprises the at least one conductor core. ### Claim 18 (depends on 16) A wireless power receiver system of claim 16, wherein the first capacitor comprises a dielectric material, wherein the first inductor comprises the at least one conductor core, and wherein the at least one conductor core passes through the dielectric material. ### Claim 19 (depends on 16) A wireless power receiver system of claim 16, wherein the first capacitor comprises a capacitor at the first end. ### Claim 20 (depends on 16) A wireless power receiver system of claim 16, wherein attenuating the at least one second frequency generated by the wireless power transfer system and attenuating the at least one frequency generated by the wireless power transfer system are both attenuating the same frequency.