# US 10,483,799 B2 · Power supply and pickup system capable of maintaining stability of transmission efficiency despite changes in resonant frequency > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,799 B2 - Document ID: US10483799B2 - Status: Granted - Kind: B2 - Application number: 16/247,794 - Filed: 2019-01-15 - Published: 2019-08-29 - Granted: 2019-11-19 - Earliest claimed: 2011-09-26 - Assignees: Korea Advanced Institute of Science and Technology - Applicants: Korea Advanced Institute of Science and Technology - Inventors: Dong Ho Cho; Joung Ho Kim; Yang Bae Chun; Eun-Jung Kim; Ji-Yun Ryu; Mi-Joo Kim; Il-Song Han; Seung-Young Ahn; Gyeng-Chul Kim; Gu Ho Jeong - Web page: https://patentgrep.com/patent/US10483799B2 ## CPC - B60L 9/28: polyphase motors - B60L 50/51: characterised by AC-motors - B60L 53/12: Inductive energy transfer - B60L 53/36: by positioning the vehicle - B60L 53/39: with position-responsive activation of primary coils - B60M 7/00: Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/366: {made of ferromagnetic material} - H01F 38/14: Inductive couplings - 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 2240/36: Temperature of vehicle components or parts - H02J 50/001: {Energy harvesting or scavenging} - H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] - 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 - 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 - B60M: POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES (control of points and safety arrangements along railway lines B61L; construction of rails and points in general E01B) - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The present invention relates to a power supply and pickup system capable of maintaining stability of transmission efficiency despite changes in a resonant frequency. More particularly, the present invention relates to a power supply and pickup system capable of maintaining the stability of efficiency of transmitting power to a pickup device from a power supply device even when a voltage or current changes by the variation in a resonant frequency. According to the power supply and pickup system of the present invention, Q-factor of a power supply and pickup system is set to a low value, a stability of efficiency of transmitting power to a pickup device from a power supply device is maintained even when a voltage of current changes by the variation in a resonant frequency. ## Claims ### Claim 1 A power supply device supplying power to a moving object using magnetic induction, the power supply device comprising: a power supply coil which is arranged to extend in a traveling direction of the moving object and through which a current flows to form a magnetic field; and a power supply core adjusting a direction of the magnetic field and having a plurality of magnetic poles extended to be parallel to the traveling direction of the moving object, wherein the power supply core is arranged with respect to the power supply coil so that two neighboring magnetic poles of the power supply core have different magnetic polarities and a direction of the magnetic field at the magnetic poles of the power supply core is perpendicular to the traveling direction of the moving object, and wherein Q-factor of the power supply device is less than 100, said Q-factor is determined by Qs = wLs Rs , wherein said w is an angular frequency of the current, said Ls is an inductance of said power supply device, and said Rs is a resistance of said power supply device, wherein a cross section of the power supply core perpendicular to the traveling direction of the moving object has a W-shape and said power supply coil is arranged in parallel to the traveling direction of the moving object in the power supply core. ### Claim 2 (depends on 1) The power supply device of claim 1, wherein the magnetic poles of the power supply core are arranged in series in the traveling direction of the moving body, and the power supply coil is arranged in parallel to the traveling direction of the moving body on both sides of said magnetic poles and intersect each other between said magnetic poles. ### Claim 3 (depends on 1) The power supply device of claim 1, further comprising a linear magnetic shield member installed in the traveling direction. ### Claim 4 (depends on 1) The power supply device of claim 1, wherein said power supply core is formed of a plurality of power supply modules which have one or more magnetic poles arranged in series in the traveling direction of the moving object arranged on lines in series in the traveling direction. ### Claim 5 (depends on 4) The power supply device of claim 4, wherein each of said power supply modules has core connection parts at front and rear ends and the power supply modules are connected to each other by said core connection parts and arranged on lines in series in the traveling direction. ### Claim 6 (depends on 4) The power supply device of claim 4, wherein said power supply modules are arranged to be spaced apart from each other to accept thermal expansion and thermal contraction. ### Claim 7 (depends on 4) The power supply device of claim 4, wherein said power supply core has a glass fiber reinforced plastic which is installed at an upper part or a lower part. ### Claim 8 A power supply device supplying power to a moving object using magnetic induction, the power supply device comprising: a power supply coil which is arranged to extend in a traveling direction of the moving object and through which a current flows to form a magnetic field; and a power supply core adjusting a direction of the magnetic field and having a plurality of magnetic poles extended to be parallel to the traveling direction of the moving object, wherein the power supply core is arranged with respect to the power supply coil so that two neighboring magnetic poles of the power supply core have different magnetic polarities and a direction of the magnetic field at the magnetic poles of the power supply core is perpendicular to the traveling direction of the moving object, and wherein Q-factor of the power supply device is less than 100, said Q-factor is determined by Qs = wLs Rs , wherein said w is an angular frequency of the current, said Ls is an inductance of said power supply device, and said Rs is a resistance of said power supply device, wherein a cross section of the power supply core perpendicular to the traveling direction of the moving object has a pair of W-shapes adjoining each other and said power supply coil is arranged in parallel to the traveling direction of the moving object in the power supply core, wherein said power supply coil is disposed in each of said W-shapes.