Patent US5528113A successfully refreshed from Google Patents.
US5528113A
Expired / Lapsed
US
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Inductive power pick-up coils
Assignee: Auckland Uniservices Ltd
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Filing: 1994-10-21
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Granted: 1996-06-18
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Expires: 2014-10-21
Abstract
Abstract A loosely coupled inductive power transfer system suitable for transferring power to a mobile conveyer platform or a vehicle has pick-up coils wound on flux concentrator(s). One or more large flat horizontal ferrite cores 607, 608 are used to concentrate the horizontal component of magnetic flux from an extended volume into one or more secondary or pick-up coils 613. Each shock-resistant core comprises an array of many individual strips of ferrite held in close contact. One, more usually two, or perhaps more resonant pick-up windings are wound about each core and each winding has a shorting switch (within 602, 603 . . . ) placed across it. A controller 601 connects a controlled output voltage on to an output bus 605, 606 from the best-placed pick-up winding on any one core at any moment, while holding the others in a shorted hence inactive state.
Inventors
- 👤 John T. Boys
- 👤 Andrew W. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/14; B; B60; B60L; B60L53/00; B60L53/10; B60L53/12; B60L53/126; B60L53/20; B60L53/22; B60L53/30; B60L53/32; B60L53/35; B60L53/36; B60L53/38; B60L53/39; H02; H02J; H02J50/00; H02J50/005; H02J50/10; H02J50/12; H02J50/40; H02J50/402; H02J50/90; B60L2200/00; B60L2200/26; B60L2200/40; B60L2200/44; B60L2210/00; B60L2210/30; B60L2240/00; B60L2240/60; B60L2240/62; B60L2260/00; B60L2260/20; B60L2260/32; Y; Y02; Y02P; Y02P90/00; Y02P90/60; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072; Y02T10/72; Y02T90/00; Y02T90/10; Y02T90/12; Y02T90/14; Y02T90/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
Inductive power pick-up means comprising a plurality of pick-up coils mounted on a movable support, said coils being spaced apart from one another, each coil being adapted to pick-up inductive power from a primary conductor so that each coil acts as a secondary conductor when located relative to said primary conductor, and control means capable of identifying from time to time the pickup coil or coils in best alignment with said primary conductor, said control means including switching means capable of switching "on" the identified pickup coil or coils which are best placed to collect inductive power from said primary conductor, and to render functionally inactive the coil or coils which are remote from said primary conductor.
Claim 2
Dependent Claim
117 words
Inductive power pick-up means comprising a plurality of pick-up coils mounted on a movable support, said coils being spaced apart from one another, each coil being adapted to pick-up inductive power from a primary conductor so that each coil acts as a secondary conductor when located relative to said primary conductor, and control means capable of identifying from time to time the pickup coil or coils in best alignment with said primary conductor, said control means including switching means capable of switching "on" the identified pickup coil or coils which are best placed to collect inductive power from said primary conductor, and to render functionally inactive the coil or coils which are remote from said primary conductor.
Claim 3
Dependent Claim
29 words
Inductive power pick-up means as claimed in claim 1 wherein said control means is capable of determining from time to time the short-circuit current available at each pickup coil.
Claim 4
Dependent Claim
33 words
Inductive power pick-up means as claimed in claim 1 wherein said control means has means to measure the rate of voltage increase that occurs when the coil is released from a shorted state.
Claim 5
Dependent Claim
28 words
Inductive power pick-up means as claimed in claim 1 wherein said control means maintains those coils which are not loaded, or only partly loaded, in a short-circuited state.
Claim 6
Dependent Claim
36 words
Inductive power pick-up means as claimed in claim 1 wherein said control means includes means to control the amount of resonant current flowing in any pick-up coil, by controlling the voltage output after rectification and smoothing.
Claim 7
Dependent Claim
36 words
Inductive power pick-up means as claimed in claim 1 wherein each pick-up coil is mounted on a ferromagnetic flux concentrator adapted for capturing flux lines and feeding them through the magnetic core of said pickup coil.
Claim 8
Dependent Claim
84 words
Inductive power pick-up means as claimed in claim 6 wherein the ferromagnetic flux concentrator comprises an elongate mass of magnetically permeable material having a main face substantially parallel to said primary conductor, said mass having a length, a width, and a height, wherein said mass is mounted on said support so that in use the length of the mass of magnetic material is substantially at right angles to said primary conductor to concentrate the horizontal component of the magnetic flux through the flux concentrator.
Claim 9
Dependent Claim
21 words
Inductive power pick-up means as claimed in claim 7 wherein the magnetic permeability of the magnetic core is 1000 or greater.
Claim 10
Dependent Claim
23 words
Inductive power pick-up means as claimed in claim 7 wherein the magnetic core is capable of undergoing distortion without permanent loss of function.
Claim 11
Dependent Claim
102 words
Inductive power pick-up means as claimed in claim 7 wherein the magnetic core is composed of a ferrite material, provided as a modular array comprising at least four fingers of material, each finger having at least one shaped side, the fingers being laid side by side along the length of the elongate mass in an array with these shaped sides held in close contact with each other by a compliant force exerting a compression force along the length of the array, so that the permeability of the array is substantially similar to that of an equivalent single mass of the ferrite material.
Claim 12
Dependent Claim
17 words
Inductive power pick-up means as claimed in claim 10 wherein the shaped sides are substantially optically flat.
Claim 13
Dependent Claim
21 words
Inductive power pick-up means as claimed in claim 7 wherein more than one pick-up coil is provided on a single core.
Claim 14
Dependent Claim
29 words
Inductive power pick-up means as claimed in claim 7 wherein a conducting sheet is positioned on the side of the magnetic core away from the source of magnetic flux.
Claim 15
Dependent Claim
36 words
Inductive power pick-up means as claimed in claim 1 wherein each pick-up coil is tuned with its own resonating capacitor and each has its own rectifier so that a DC output can be taken from it.
Claim 16
Dependent Claim
17 words
Inductive power pick-up means as claimed in claim 1 wherein the movable support is a wheeled vehicle.
Claim 17
Dependent Claim
67 words
Inductive power pick-up means as claimed in claim 15 wherein the wheeled vehicle has at least one steerable wheel controlled by a steering controller connected to said control means, and said steering controller is adapted to steer the vehicle in response to the detection of said primary conductor by the control means so that the vehicle in use can follow a path defined by said primary conductor.
References Cited (Backward Citations)
DE2613105A1
Cited
US4331225A
Cited
BE879677A
Cited
US4836344A
Cited
DE3915682A1
Cited
JPH03239135A
Cited
US5027709A
Cited
US5293308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |