The present invention is in the field of wireless power transfer systems. More particularly, but not exclusively, the invention relates to magnetically permeable cores incorporated into transmitter coils, receiver coils and inductors in resonant and non-resonant circuits of wireless power transfer systems.
In the production of winding cores for inductors, manufacturing variations causing small variations in inductance can significantly affect performance, especially for resonant circuits. One particular kind of ferromagnetic core used in the production of inductors is known as a “gapped core”. The ferromagnetic core may be shaped into a circle or rectangle or other suitable shape with a section removed to form an air gap. These are typically used to address saturation and other performance issues. It is difficult to trim gapped cores as the introduction of small amounts of magnetically permeable material into the air gap can result in a significant change in inductance.
One solution is to introduce a moveable magnetic slug however this can result in significant non-linear changes in inductance of a wound gapped core. To obtain better precision, a fine screw thread is cut on the face of the slug and the faces on either side of the air gap are correspondingly tapped. However, the precision machining required to achieve precise trimming can be expensive.
It is an object of the invention to provide an improved coil arrangement or to at least provide the public with a useful choice.
According to one exemplary embodiment there is provided a coil arrangement for an inductive power transfer system comprising:
According to another exemplary embodiment there is provided a coil arrangement for an inductive power transfer system comprising:
According to another exemplary embodiment there is provided a coil arrangement for an inductive power transfer system comprising:
It is acknowledged that the terms “comprise”, “comprises” and “comprising” may, under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, these terms are intended to have an inclusive meaning—i.e. they will be taken to mean an inclusion of the listed components which the use directly references, and possibly also of other non-specified components or elements.
Reference to any prior art in this specification does not constitute an admission that such prior art forms part of the common general knowledge.
The accompanying drawings which are incorporated in and constitute part of the specification, illustrate embodiments of the invention and, together with the general description of the invention given above, and the detailed description of exemplary embodiments given below, serve to explain the principles of the invention.
Referring to
The tuning slug 2 may be moved between two extreme positions shown in
The tuning slug 2 in
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It will be appreciated that in all the above embodiments a coil will be provided about the core, complementary threads provided in the slug and core may be used for adjustment or the slug may be freely moveable and then secured in place by gluing etc. The aspect ratio of the tip of the tuning slug should also be greater than 1:1 to assist in fine tuning.
It will also be appreciated that the tuning slug has an “effective permeability” that varies along its length—that is to say for a cylindrical bore for example that the effective permeability at a cross-section along the axis of the bore the effective permeability is permeability for the entire cross section. Thus for a cross section where half the volume of the bore is occupied by a slug formed of a material of constant permeability the effective permeability will be half that where the entire slug occupies the bore. Alternatively, the effective permeability may vary if the slug is of constant cross-section (e.g. a cylinder) but the permeability of the material forming the slug varies progressively along the axis of the slug.
There is thus provided coil arrangements enabling precise fine tuning of inductance without the need for fine threads. Embodiments avoid the large fluctuations of inductance that are characteristic of the use of known tuning slug configurations in which the sudden introduction of a high permeability material into the flux path way affects the inductance in a non-linear or “binary” manner, making fine tuning difficult.
Where reference is made to any integer it will be appreciated that such integer may be a discrete integer or a number of integers performing the required function. Likewise, where reference is made to a number of discrete integers it will be appreciated that they may be integrated into a single unified integer. While the present invention has been illustrated by the description of the embodiments thereof, and while the embodiments have been described in detail, it is not the intention of the applicant to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative apparatus and method, and illustrative examples shown and described. Accordingly, departures may be made from such details without departure from the spirit or scope of the applicant's general inventive concept.
Number | Name | Date | Kind |
---|---|---|---|
4183193 | Klingelhofer et al. | Jan 1980 | A |
4873677 | Sakamoto et al. | Oct 1989 | A |
4973907 | Bergman et al. | Nov 1990 | A |
4980794 | Engel | Dec 1990 | A |
5000178 | Griffith | Mar 1991 | A |
5469036 | Eto | Nov 1995 | A |
5496036 | Chester | Mar 1996 | A |
5506560 | Takeuchi et al. | Apr 1996 | A |
5654621 | Seelig | Aug 1997 | A |
5945744 | Dobler et al. | Aug 1999 | A |
5959433 | Rohde | Sep 1999 | A |
6151231 | Saint-Pierre et al. | Nov 2000 | A |
6320772 | Doyama et al. | Nov 2001 | B1 |
6510109 | Ohmori | Jan 2003 | B2 |
6803744 | Sabo | Oct 2004 | B1 |
7057486 | Kiko | Jun 2006 | B2 |
7103413 | Swanson et al. | Sep 2006 | B2 |
7164255 | Hui | Jan 2007 | B2 |
7197113 | Katcha et al. | Mar 2007 | B1 |
7394243 | Tsuchida et al. | Jul 2008 | B2 |
7525283 | Cheng et al. | Aug 2009 | B2 |
7599744 | Giordano et al. | Oct 2009 | B2 |
7880337 | Farkas | Feb 2011 | B2 |
7915858 | Liu et al. | Mar 2011 | B2 |
7948208 | Partovi et al. | May 2011 | B2 |
8125305 | Saito et al. | Feb 2012 | B2 |
8169185 | Partovi et al. | May 2012 | B2 |
8228010 | Zadeh | Jul 2012 | B2 |
8258653 | Kitamura et al. | Sep 2012 | B2 |
8299753 | Hui | Oct 2012 | B2 |
8519668 | Hui | Aug 2013 | B2 |
8629652 | Partovi et al. | Jan 2014 | B2 |
8629654 | Partovi et al. | Jan 2014 | B2 |
8824624 | Loef et al. | Sep 2014 | B2 |
9064632 | Loiselle et al. | Jun 2015 | B2 |
9362985 | Uchida | Jun 2016 | B2 |
20040000466 | Kubat et al. | Jan 2004 | A1 |
20040046634 | Gokhale et al. | Mar 2004 | A1 |
20050068019 | Nakamura et al. | Mar 2005 | A1 |
20050133497 | Makoto | Jun 2005 | A1 |
20050140482 | Cheng et al. | Jun 2005 | A1 |
20070064406 | Bead | Mar 2007 | A1 |
20100109604 | Boys et al. | May 2010 | A1 |
20100259217 | Baarman et al. | Oct 2010 | A1 |
20100270288 | Hackbarth et al. | Oct 2010 | A1 |
20110115429 | Toivola et al. | May 2011 | A1 |
20120177041 | Kook | Jul 2012 | A1 |
20130001571 | Jung et al. | Jan 2013 | A1 |
20130026850 | Throngnumchai et al. | Jan 2013 | A1 |
20130030892 | Liu et al. | Jan 2013 | A1 |
20130119773 | Davis | May 2013 | A1 |
20130175984 | Yamazaki et al. | Jul 2013 | A1 |
20140091755 | Walley et al. | Apr 2014 | A1 |
20140197687 | Lin | Jul 2014 | A1 |
20150138031 | Van Gils et al. | May 2015 | A1 |
20150302982 | Meyer | Oct 2015 | A1 |
20160099602 | Leabman et al. | Aug 2016 | A1 |
20170140868 | Kim | May 2017 | A1 |
Number | Date | Country |
---|---|---|
101461114 | Jun 2009 | CN |
1915044 | Oct 1970 | DE |
3213602 | Oct 1983 | DE |
3733944 | Apr 1989 | DE |
3839386 | May 1990 | DE |
10044558 | Mar 2002 | DE |
10341113 | Apr 2009 | DE |
0370377 | May 1990 | EP |
0399563 | Nov 1990 | EP |
0399563 | Jul 1991 | EP |
0370377 | Feb 1992 | EP |
0965521 | Dec 1999 | EP |
1372173 | Dec 2003 | EP |
1372173 | May 2008 | EP |
2602908 | Jun 2013 | EP |
3127215 | Feb 2017 | EP |
238945 | Sep 1978 | FR |
2103886 | Dec 1984 | GB |
57096513 | Jun 1982 | JP |
59058811 | Apr 1984 | JP |
60254400 | Dec 1985 | JP |
S60254440 | Dec 1985 | JP |
H0354103 | Mar 1991 | JP |
H06197479 | Jul 1994 | JP |
H06277358 | Oct 1994 | JP |
09007837 | Jan 1997 | JP |
2846090 | Jan 1999 | JP |
2001044054 | Feb 2001 | JP |
2001196249 | Jul 2001 | JP |
2002246248 | Aug 2002 | JP |
2003118671 | Apr 2003 | JP |
2003141466 | May 2003 | JP |
2004235462 | Aug 2004 | JP |
2004281814 | Oct 2004 | JP |
2005302959 | Oct 2005 | JP |
06-029128 | Feb 2006 | JP |
2006042519 | Feb 2006 | JP |
06-105471 | Apr 2006 | JP |
2006128381 | May 2006 | JP |
2006245363 | Sep 2006 | JP |
2006245950 | Sep 2006 | JP |
2007505480 | Mar 2007 | JP |
2008154446 | Jul 2008 | JP |
2008263740 | Oct 2008 | JP |
2010527226 | Nov 2008 | JP |
2009088479 | Apr 2009 | JP |
2009164293 | Jul 2009 | JP |
2009201328 | Sep 2009 | JP |
2009295930 | Dec 2009 | JP |
2010119187 | May 2010 | JP |
2010135701 | Jun 2010 | JP |
2011072188 | Apr 2011 | JP |
2011103694 | May 2011 | JP |
1747789 | Aug 2011 | JP |
2011181769 | Sep 2011 | JP |
2011229360 | Nov 2011 | JP |
04835787 | Dec 2011 | JP |
2012079806 | Apr 2012 | JP |
2012119496 | Jun 2012 | JP |
2012120328 | Jun 2012 | JP |
2012178529 | Sep 2012 | JP |
2013534040 | Aug 2013 | JP |
2014023348 | Feb 2014 | JP |
100944113 | Feb 2010 | KR |
1020100017582 | Feb 2010 | KR |
2003105308 | Dec 2003 | WO |
2005024865 | Mar 2005 | WO |
2005033819 | Apr 2005 | WO |
2005109598 | Nov 2005 | WO |
2006059771 | Jun 2006 | WO |
2007031897 | Mar 2007 | WO |
200712632 | Nov 2007 | WO |
2007126321 | Nov 2007 | WO |
2007131373 | Nov 2007 | WO |
2008137996 | Nov 2008 | WO |
2008140333 | Nov 2008 | WO |
2009015745 | Feb 2009 | WO |
2009004587 | Apr 2009 | WO |
2010090539 | Aug 2010 | WO |
20100909538 | Aug 2010 | WO |
2010124165 | Oct 2010 | WO |
2011016736 | Feb 2011 | WO |
2011016737 | Feb 2011 | WO |
2011074091 | Jun 2011 | WO |
2012040548 | Mar 2012 | WO |
2012073427 | Jun 2012 | WO |
2013036146 | Mar 2013 | WO |
2013103943 | Jul 2013 | WO |
2013122483 | Aug 2013 | WO |
2013186180 | Dec 2013 | WO |
2013187777 | Dec 2013 | WO |
2014011059 | Jan 2014 | WO |
2014083015 | Jun 2014 | WO |
2014122121 | Aug 2014 | WO |
2014122125 | Aug 2014 | WO |
Entry |
---|
“Abdolkhani A. et al., “A Novel Detached Magnetic Coupling Structure for Contactless Power Transfer”, IECON/ICELIE, 1103-1108 (2011)”. |
“Abdolkhani, A. et al., “A Sandwiched Magnetic Coupling Structure for Contactless Slipring Applications”, International Geoinformatics Research and Development, 2(3): 1-9 (2011)”. |
“Abdolkhani, A. et al., “Face to Face Through-hole Contactless Slipring System for Rotary Applications”, IJAREEIE, 2(9): 4277-4286 (2013)”. |
“Abdolkhani, A. et al., “Modelling and Parameters Identification of Through-Hole Type Wind Turbine Contactless Sliprings”, SCIRP/Engineering, 4: 272-283 (2012)”. |
“Esser, A. et al., “A New Approach to Power Supplies for Robots”, IEEE Transactions on Industry Applications, 27(5): 872-875 (1991)”. |
“Kacprzak, D. “A Novel S-Pickup for High Power Inductive Power Transfer Systems”, Magnetics Conference, INTERMAG, 1 pg. (2006)”. |
“Kacprzak, D. et al., “An Improved Magnetic Design for Inductively Coupled Power Transfer System Pickups”, Power Engineering Conference, IPEC, 1133-1136 (2005)”. |
“Legranger, J. et al., “Comparison of Two Optimal Rotary Transformer Designs for Highly Constrained Applications”, Electric Machines & Drives Conference, IEMDC, 1546-1551 (2007)”. |
“Moradewicz, A.J. et al., “High efficiency contactless energy transfer system with power electronic resonant converter”, Technical Sciences, 57(4): 375-381 (2009)”. |
“Muljadi, E. et al., “Pitch-Controlled Variable-Speed Wind Turbine Generation”, Industry Applications Conference, 34th IAS Annual Meeting, Conference Record of the 1999 IEEE, 1: 323-330 (1999)”. |
“Papastergiou, K. et al., “An Airborne Radar Power Supply With Contactless Transfer of Energy—Part I: Rotating Transformer”, IEEE Transactions on Industrial Electronics, 54(5): 2874-2884 (2007)”. |
“Papastergiou, K. et al., “Contact-less Transfer of Energy by means of a Rotating Transformer”, IEEE ISIE, 1735-1740 (2005)”. |
“Potter, B.A. et al., “Design, Implementation and Characterisation of a Contactless Power Transfer System for Rotating Applications”, IEEE, 2168-2173 (2006)”. |
“Spackman, D. et al., “Magnetic Interference in Multi-Pickup Monorail Inductively Coupled Power Transfer Systems”, Journal of the Japan Society of Applied Electromagnetics and Mechanics, 15(3): 238-241 (2007)”. |
“Zaheer, A. et al., “A Bipolar Pad in a 10 kHz, 300W Distributed IPT System for AGV applications”, IEEE Transactions on Industrial Electronics, pp. 1-14 (2013)”. |
Budhia, et al., “Develpoment of a Single-Sided Flux Magnetic Coupler for Electric Vehicle IPT Charging Systems”, IEEE Transactions on Industrial Electronics, vol. 60, No. 1, Jan. 1, 2013 (Jan. 1, 2013), pp. 318-328, XP002781664, DOI: 10.1109/TIE.2011.2179274, p. 325. |
Bosshard et al., “Comprehensive Evaluation of Rectangular and Double-D Coil Geometry for 50 kw185 kHz IPT System” IEEE Journal of Emerging and Selected Topics on Power Electronics (JESTPS), vol. 4, No. 4, Dec. 31, 2016 (Dec. 31, 2016), pp. 1406-1415, XP002781665, DOIL 10-1109/JESTPE.2016.2600162, p. 1408. |
Boys, John T., et al., “Controlling Inrush Currents in Inductively Coupled Power Systems”, 2005 International Power Engineering Conference, Nov. 29, 2005-Dec. 2, 2005, 7, IEEE, Singapore, Singapore. |
Gao. “Demodulating Communication Signals of Qi-Compliant Low-Power Wireless Charger Using MC56F8006 DSC.” Freescale Semiconductor Inc. (2013) pp. 1-21. |
Waffenschmidt et al. “Limitation of Inductive Power Transfer for Consumer Applications.” 13th European Conference on Power Electronics (EPE), (Sep. 8, 2009), pp. 1-10. |
Number | Date | Country | |
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20190081511 A1 | Mar 2019 | US |
Number | Date | Country | |
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62341385 | May 2016 | US |
Number | Date | Country | |
---|---|---|---|
Parent | PCT/NZ2017/050068 | May 2017 | US |
Child | 16189948 | US |