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WO2016026095A1 - Bobine de charge mince sans fil à haut rendement et système de charge sans fil associé - Google Patents

Bobine de charge mince sans fil à haut rendement et système de charge sans fil associé Download PDF

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Publication number
WO2016026095A1
WO2016026095A1 PCT/CN2014/084783 CN2014084783W WO2016026095A1 WO 2016026095 A1 WO2016026095 A1 WO 2016026095A1 CN 2014084783 W CN2014084783 W CN 2014084783W WO 2016026095 A1 WO2016026095 A1 WO 2016026095A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless charging
outer edge
winding
magnetic
wedge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/084783
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English (en)
Chinese (zh)
Inventor
黄智�
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/CN2014/084783 priority Critical patent/WO2016026095A1/fr
Priority to CN201480080002.4A priority patent/CN106464023B/zh
Publication of WO2016026095A1 publication Critical patent/WO2016026095A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings

Definitions

  • the present invention relates to the field of wireless charging, and more particularly to a thin high-efficiency charging coil and a wireless charging system using the same.
  • the electromagnetic induction method is a commercially successful wireless charging technology, as shown in Fig. 1, which is a circuit block diagram of the current electromagnetic induction mode.
  • the transmitting coil Tx has an inductance L s and an equivalent resistance R s in series with the resonant capacitor C s
  • the receiving coil Rx has an inductance L D and an equivalent resistance R D in series with the resonant capacitor C D . It can be seen that the distance between the transmitting coil Tx and the receiving coil Rx is D, and the two transmit energy through the coupled inductor M, and the design of the coil becomes critical.
  • the principle of electromagnetic induction realizes the wireless power supply.
  • the resonant frequency is generally between 1 10 ⁇ 205 ⁇ . If the magnetic radiation shielding is not good, it will bring potential safety hazards to the product.
  • the charging coil is generally attached to the product, the battery and other conductive in the product. The body will absorb the electromagnetic energy from the transmitting coil Tx, and the temperature is long. The degree will gradually increase, which will burn the product and cause safety hazard to the human body. Therefore, in principle, the wireless charging scheme coil must be attached with a magnetic shield.
  • the application of the magnetic isolation diaphragm can be said to be particularly important in the wireless charging scheme. It is not only for magnetic isolation to avoid radiation products, but also plays an important role in the overall efficiency of the entire product.
  • the magnetic separators are usually placed on the bottom and top surfaces of the two coils, so that the electromagnetic energy is wrapped in the middle. , which in turn increases efficiency and lowers temperature.
  • the wireless charging coil is composed of a coiled coil Tx and a receiving coil Rx.
  • the center of the transmitting coil Tx is provided with a positioning permanent magnet 22 to ensure that the receiving coil Rx can be aligned with the transmitting coil Tx. It is possible to effectively prevent the magnetic flux from being cut to the battery 21 behind the receiving coil Rx.
  • the material of the magnetic isolation sheet 23 is mainly used for ferrite sheets, metal powder chips, amorphous laminates, etc. Basically, the properties of these materials have their own advantages, and the ferrite sheets have high magnetic permeability and low loss, and are shielded. The effect is better; the saturation magnetic flux density of the metal powder chip is higher; the amorphous lamination has better processability and can achieve a very thin lamination thickness.
  • the wireless charging coil is divided into a transmitting coil Tx and a receiving coil Rx.
  • the transmitting coil Tx is often built in a separate wireless charging base, the thickness requirement is relatively low, so the current design and manufacture are relatively simple;
  • the receiving coil Rx often needs to be built in the electronic device to be charged, such as a mobile phone, a camera, etc., so the thickness requirement is relatively high, and often requires a size of 1 mm or a thinner, so that the actual use will bring inefficiency and heat. Waiting for the situation.
  • the prior art is insufficient in the thin design of the coil, and the top view and the flat view of the prior art receiving coil Rx are respectively illustrated in Figs. 3(1) and 3(2).
  • the receiving coil Rx uses two square wires and is wound around one layer. The problem is that such a winding causes a terminal 31 to fly from the inside of the coil winding 32 to the outside, so that the thickness of the entire receiving coil Rx is actually increased in addition to the thickness of the magnetic sheet 33 and the coil winding 32.
  • the thickness of the one-layer outlet terminal 31 does not match the demand for thinning.
  • the minimum power loss figure of merit ⁇ ⁇ is related to the product of the coupling coefficient ⁇ between the receiving coil Rx and the transmitting coil Tx and the system quality factor Q.
  • the system quality factor Q is the geometric mean of the transmitting coil Tx quality factor 3 ⁇ 4 and the receiving coil Rx quality factor Q D .
  • the transmission efficiency of the charging coil as the output power P.
  • the ratio of ut to the input power ⁇ ⁇ , the maximum transmission efficiency can also be obtained by calculating the minimum power loss figure of merit ⁇ réelle ⁇ .
  • the present invention discloses a thin high-efficiency wireless charging coil, which is characterized in that it comprises:
  • the magnetic isolation sheet is closely attached to the outer edge platform of the wedge-shaped winding, and is formed together with the inner edge, and the accommodating space is filled with magnetic powder glue;
  • the inner edge is closest to the accommodating space, and the outer edge is farthest from the accommodating space, and the outer edge thickness and the inner edge thickness of the wedge-shaped cross-section winding satisfy:
  • the present invention further includes a thin high-efficiency wireless charging coil, characterized in that the wedge-shaped cross-section winding is formed by winding a plurality of strands of Liesz wire.
  • the present invention further includes a thin high-efficiency wireless charging coil, characterized in that the outgoing lines of the wedge-shaped cross-section windings are external outgoing lines.
  • the present invention further includes a thin high-efficiency wireless charging coil, characterized in that the inner shape of the wedge-shaped winding includes a square or a circular shape.
  • the present invention further includes a wireless charging system characterized in that
  • the width of the largest outer edge platform base of the winding of the receiving coil of the wireless charging system is no greater than the width of the largest outer edge platform base of the winding of the transmitting coil.
  • the thin high-efficiency wireless charging coil and the wireless charging system thereof having the above structure can obtain a product of a higher coupling coefficient and a system quality factor K.Q, that is, better transmission efficiency. Moreover, the space utilization rate of the scheme is high, the outlet is convenient, and it is more suitable for the thinning demand.
  • Figure 1 is a block diagram of a circuit architecture for electromagnetic induction wireless charging
  • Figure 2 shows a schematic diagram of a wireless charging system
  • Figure 5 shows the magnetic flux distribution of the wireless charging system and the variation of the magnetic flux along the position of the receiving coil Rx;
  • Figure 6 is a cross-sectional view showing the first preferred wedge-shaped winding 42
  • Figure 8 illustrates a schematic cross-sectional view of a second preferred wedge-shaped winding 42
  • Figure 9 illustrates a schematic cross-sectional view of a third preferred wedge-shaped winding 42.
  • Table 1 is a comparison of the DC resistance of the receiving coil Rx and the reference receiving coil Rx and the AC resistance at 100 kHz and 200 kHz according to the present invention;
  • Table 2 compares the parameters of the transmission system and the reference transmission system of the present invention.
  • the receiving coil Rx winding arrange as many amps as possible at the position of the opposite magnetic flux ⁇ ⁇ , that is, more turns; and arrange less in the distance away from the magnetic flux ⁇ Oh, that is, fewer turns.
  • the position of the magnetic flux ⁇ of the transmitting coil ⁇ is basically biased toward the outer edge 422 of the winding, which means that we need to have more turns on the outer edge 422 of the winding, and the inner edge of the winding 421 There are fewer turns, that is, a winding structure with a wedge-shaped cross section.
  • a wedge-shaped winding structure is applied.
  • the thin high-efficiency wireless charging coil of the present invention comprises the following components, a magnetic isolation sheet 41, a wedge-shaped cross-section winding 42 adhered to the center of the magnetic isolation sheet 41, and a magnetic spacer 41 and a wedge-shaped winding 42. Filled magnetic powder glue.
  • the prepared wedge-shaped section winding 42 is adhered to the central position of the magnetic shield 41, and an accommodating space 43 is formed inside the two; the prepared magnetic powder is injected into the accommodating space 43 and heated and solidified to form high efficiency.
  • Thin charging coil is the following components, a magnetic isolation sheet 41, a wedge-shaped cross-section winding 42 adhered to the center of the magnetic isolation sheet 41, and a magnetic spacer 41 and a wedge-shaped winding 42.
  • Filled magnetic powder glue The prepared wedge-shaped section winding 42 is adhered to the central position of the magnetic shield 41, and an accommodating space 43 is formed inside the two; the prepared magnetic powder is injected into the accommodating space 43 and heated and solidified to form high efficiency.
  • the low equivalent resistances R D , R s represent the losses of the thin high efficiency wireless charging coil of the present invention.
  • the loss of the thin high-efficiency wireless charging coil includes the core loss of the magnetic material such as the magnetic spacer 41 and the eddy current loss of the wedge-shaped winding 42 by the magnetic flux.
  • the transmitting coil Tx and the receiving coil Rx are separated by a considerable distance, resulting in a small amount of excitation inductance of the entire transformer, so that under practical application conditions, the transformer transmission system is exchanged.
  • the flux density swing ⁇ is actually small. Under such conditions, the core loss of the magnetic material is actually dominated by the eddy current loss of the core.
  • iron Both oxygen and magnetic powder have high electrical resistivity, so their eddy current loss is also small, then the equivalent resistance RD,
  • Multi-strand Litz wire has a certain plastic deformation Sex, which helps to obtain a higher copper window fill rate; also based on plastic deformation, in the case where the thickness of the inner winding 421 and the outer edge 422 of the coil winding are different, it helps us to obtain the possibility of exiting from the outside.
  • the ratio of the thickness of the outer edge 422 to the thickness of the inner edge 421 / ⁇ should not be less than 1.5, the ratio of the outer edge 422 thickness h 2 to the thickness of the inner edge 421 is not less than 1.5. Preferably, it should be not less than 2. From the perspective of efficiency, in order to obtain the largest possible coupling inductance M, we hope that the number of turns of the outer edge 422 is as much as possible, so the ratio d/D of the width D of the outer edge platform 424 to the width d of the winding base should be not less than 10%. Should be no less than 20%.
  • the wedge-shaped section winding 42 is adhered to the center of the magnetic isolation sheet 41, and an accommodating space 43 is formed.
  • the magnetic powder we fill the space with magnetic powder, the magnetic powder.
  • the magnetic permeability of the rubber is greater than or equal to 5, and preferably its magnetic permeability is 10 or more to ensure an increase in the inductance of the thin high-efficiency wireless charging coil of the present invention.
  • the magnetic powder is composed of a mixture of an iron-based metal alloy powder having a high saturation magnetic flux density and a resin colloid such as FeSiAl, FeSi, FeSiCr, FeNi, FeNiMo or the like.
  • the filling of the magnetic powder glue not only helps to increase the inductance, but also improves the magnetic saturation condition near the inner edge 421 of the winding, and the solidification of the winding and the magnetic isolation sheet 41 after the colloid is solidified, so that the entire thin high-efficiency wireless charging coil of the present invention is obtained. More solid and not fragile.
  • the thin high-efficiency wireless charging coil of the present invention is completed, and the present invention can obtain a product K of a higher coupling coefficient and a system quality factor with respect to the prior art, that is, better transmission efficiency.
  • the solution has high space utilization rate and convenient outlet, which is more suitable for thinning requirements.
  • the thin high-efficiency wireless charging coil wedge-shaped winding inner edge 421 of the present invention may have a square or circular shape, which does not affect the technical details described above.
  • a high efficiency wireless charging coil is only used as the receiving coil Rx, or only as the transmitting coil Tx, or both, to form a charging system, and is also within the scope of the present invention.
  • the wireless charging system of the thin high-efficiency wireless charging coil of the present invention in order to obtain the maximum coupling inductance, we hope that the maximum outer edge width of the winding of the receiving coil Rx is not greater than the maximum outer edge width of the winding of the transmitting coil Tx. Revealed in Figure 5.
  • Fig. 8 is a schematic cross-sectional view showing the wedge-shaped section winding 42 in the second preferred embodiment, which is shown by pre-forming each of the Litz wire to a predetermined shape.
  • the outer edge of the wedge-shaped winding 421 has a diameter of 15 and the thickness of the inner edge 421 is 0. 3 mm, the thickness of the outer edge 422 is h. 2 ⁇ 0. 7mm, the winding base width D is 10. 5mm, the outer edge platform 424 width D is 2. 8mm 0
  • the multi-strand Litz wire is made of self-adhesive wire, starting from the inner edge 421 from the inside to the outside For the two-layer winding, due to the deformation of the tension, it is slowly extruded into a wedge-shaped winding in the mold. After the winding of the wedge-shaped cross-section winding is completed by hot air baking, the two outlet terminals are wound out at the outer edge 422 of the winding.
  • the baked winding is fixed at an intermediate position of the magnetic isolation sheet 41 having a size of 44 mm*40 mm*0. 4 mm.
  • the magnetic isolation sheet 41 is made of NiZn and has a magnetic permeability of 120.
  • the magnetic shield 41 is self-adhesive and helps to fix the wedge-shaped winding 42 at the center of the magnetic shield 41.
  • a FeSiCr powder having an average particle diameter of about 5 ⁇ m was mixed with an epoxy resin to prepare a magnetic powder having a magnetic permeability of 12.
  • the magnetic powder glue has fluidity, and the magnetic powder glue is injected into the accommodating space 43 formed between the magnetic isolation sheet 41 and the wedge-shaped cross-section winding, and after being leveled, the whole is placed in an oven to be baked and solidified, and the wireless charging reception is completed.
  • Coil Rxl Coil Rxl.
  • Table 1 it is a comparison of the DC resistance of the receiving coil Rx1 of the present invention and the reference receiving coil Rx2 and the AC resistance at 100 kHz and 200 kHz. It can be seen from the figure that the eddy current loss of the Rx2 square copper wire coil after being cut by the magnetic force line is large, and the corresponding 100KHz, 200KHz AC resistance is much larger than its DC resistance, and the multi-strand Litz wire is used for receiving.
  • the coil Rxl can effectively suppress the eddy current loss of the copper wire, and the difference between the alternating current resistance and the direct current resistance is not large.
  • a transmitting coil Tx the winding is wound by two layers of 105 strands of 0.05 mm multi-strand Litz wire, each layer is wound 10Ts, a total of 20Ts. 5 ⁇ *43mm*2. lmm ⁇
  • the winding size is 20. 5mm * 43mm * 2. lmm.
  • the magnetic isolation piece 41 has a size of 53 for *53 mm*3 mm, and the material is made of manganese-zinc power ferrite PC44, and the magnetic permeability is about 2000 u.
  • the coil is bonded to the center of the magnetic shield 41, that is, the transmitting coil Tx is formed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne une bobine de charge mince sans fil à haut rendement, comprenant : une pièce de blindage magnétique (33); un enroulement (42) ayant une forme transversale de biseau et comprenant un bord intérieur (421), un bord extérieur (422), une plate-forme de bord extérieur (423) et une base de plate-forme de bord extérieur (424), une épaisseur h1 du bord intérieur étant inférieure à une épaisseur h2 du bord extérieur, et une largeur d de la plate-forme de bord extérieur étant inférieure à une largeur D de la base de plate-forme de bord extérieur; un espace de logement (43) formé par le bord intérieur conjointement avec la pièce de blindage magnétique appuyant contre la plate-forme de bord extérieur de l'enroulement ayant une forme transversale de biseau, l'espace de logement étant rempli d'une poudre magnétique; le bord intérieur est le plus proche de l'espace de logement et le bord extérieur est le plus éloigné de l'espace de logement, et l'épaisseur du bord extérieur et l'épaisseur du bord intérieur de l'enroulement ayant une forme transversale de biseau vérifient la relation h2 / h1 ≥ 1,5. La bobine de charge sans fil peut avoir une valeur plus élevée pour le produit d'un coefficient de couplage et d'un facteur de qualité de système, K • Q, c'est-à-dire un meilleur rendement de transmission, elle utilise mieux l'espace et est commode à câbler, et est plus appropriée s'il est exigé d'utiliser des composants fins.
PCT/CN2014/084783 2014-08-20 2014-08-20 Bobine de charge mince sans fil à haut rendement et système de charge sans fil associé Ceased WO2016026095A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2014/084783 WO2016026095A1 (fr) 2014-08-20 2014-08-20 Bobine de charge mince sans fil à haut rendement et système de charge sans fil associé
CN201480080002.4A CN106464023B (zh) 2014-08-20 2014-08-20 薄型无线充电线圈及其无线充电系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/084783 WO2016026095A1 (fr) 2014-08-20 2014-08-20 Bobine de charge mince sans fil à haut rendement et système de charge sans fil associé

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WO2016026095A1 true WO2016026095A1 (fr) 2016-02-25

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110998764A (zh) * 2017-08-22 2020-04-10 三星电子株式会社 无线电力收发器和具有其的显示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108828558B (zh) * 2018-06-08 2020-10-09 上海禾赛科技股份有限公司 一种激光雷达
CN108711946A (zh) * 2018-08-02 2018-10-26 宁波微鹅电子科技有限公司 一种电能发射装置、充电系统、及充电套装
TWI859698B (zh) * 2023-01-11 2024-10-21 台達電子工業股份有限公司 無線充電模組
CN118336934A (zh) 2023-01-11 2024-07-12 台达电子工业股份有限公司 无线充电模块
CN119382378A (zh) * 2024-11-19 2025-01-28 电子科技大学 一种模块化的pcb电机定子绕组结构

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US20130038278A1 (en) * 2011-08-08 2013-02-14 Samsung Electronics Co., Ltd. Portable terminal having a wireless charger coil and an antenna element on the same plane
CN203103042U (zh) * 2013-01-16 2013-07-31 西北台庆科技股份有限公司 用于无线充电或nfc近场感应的线圈装置
CN203261137U (zh) * 2013-06-03 2013-10-30 邹民 无线充电线圈组件
CN103840513A (zh) * 2012-11-23 2014-06-04 三星电机株式会社 无线充电装置以及包括该无线充电装置的电子设备

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CN103248092B (zh) * 2013-05-02 2015-06-10 湖南人文科技学院 一种可调节的无线充电线圈及其使用方法
CN203621137U (zh) * 2013-10-21 2014-06-04 全威（铜陵）铜业科技有限公司 一种铜带收卷用内衬结构
CN103683431B (zh) * 2013-12-26 2016-06-15 深圳佰维存储科技有限公司 一体化封装无线充电装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130038278A1 (en) * 2011-08-08 2013-02-14 Samsung Electronics Co., Ltd. Portable terminal having a wireless charger coil and an antenna element on the same plane
CN103840513A (zh) * 2012-11-23 2014-06-04 三星电机株式会社 无线充电装置以及包括该无线充电装置的电子设备
CN203103042U (zh) * 2013-01-16 2013-07-31 西北台庆科技股份有限公司 用于无线充电或nfc近场感应的线圈装置
CN203261137U (zh) * 2013-06-03 2013-10-30 邹民 无线充电线圈组件

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110998764A (zh) * 2017-08-22 2020-04-10 三星电子株式会社 无线电力收发器和具有其的显示装置

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Publication number Publication date
CN106464023B (zh) 2019-01-08
CN106464023A (zh) 2017-02-22

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