CN116246864A - Coil, wireless charging module, electronic equipment and wireless charging system - Google Patents

Coil, wireless charging module, electronic equipment and wireless charging system Download PDF

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Publication number
CN116246864A
CN116246864A CN202111495495.6A CN202111495495A CN116246864A CN 116246864 A CN116246864 A CN 116246864A CN 202111495495 A CN202111495495 A CN 202111495495A CN 116246864 A CN116246864 A CN 116246864A
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CN
China
Prior art keywords
coil
coil portion
connection end
wireless charging
coil part
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Pending
Application number
CN202111495495.6A
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Chinese (zh)
Inventor
裴昌盛
任二贝
齐鹏宇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202111495495.6A priority Critical patent/CN116246864A/en
Priority to PCT/CN2022/135912 priority patent/WO2023103870A1/en
Publication of CN116246864A publication Critical patent/CN116246864A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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

Abstract

The embodiment of the application provides a coil, a wireless charging module, electronic equipment and a wireless charging system. The application provides a coil including first coil portion, the second coil portion of establishing ties each other, the second coil portion is for the axle parallel arrangement that encircles of first coil portion, and the second coil portion is arranged along the axle that encircles of first coil portion with first coil portion, in the direction of the axle that encircles of perpendicular to first coil portion, and second coil portion is located one side of first coil portion, and the coiling direction of first coil portion is the same with the coiling direction of second coil portion. The coil provided by the application can further comprise a third coil part which is coaxially wound with the first coil part and has opposite winding directions, and the second coil part can be connected between the first coil part and the third coil part in series. The present application provides a solution suitable for increasing the coupling coefficient of a coil.

Description

Coil, wireless charging module, electronic equipment and wireless charging system
Technical Field
The embodiment of the application relates to the field of electronic equipment and wireless charging, and more particularly relates to a coil, a wireless charging module, electronic equipment and a wireless charging system.
Background
The unlimited charge receiving apparatus may be disposed close to the wireless charge transmitting apparatus to form a wireless charging system. The wireless charging transmitting device may transmit a varying magnetic field through the transmitting coil. The receive coil of the wireless charging receive device may be coupled with the transmit coil of the wireless charging transmit device such that the wireless charging receive device may receive the varying magnetic field from the wireless charging transmit device through the receive coil. The varying magnetic field emitted by the transmitting coil may cause the receiving coil to generate an induced current so that the wireless charging receiving device may draw power from the wireless charging transmitting device.
The receiving coil may be flat or cylindrical, for example. The receiving coil is flat, so that the coupling coefficient between the receiving coil and the transmitting coil is improved, and the transmission power is improved. However, the practical form of an infinitely chargeable receiving device may be difficult to realize a flat receiving coil having a relatively large coupling area. It is difficult to achieve a relatively high coupling coefficient for a cylindrical receiving coil.
Disclosure of Invention
The embodiment of the application provides a coil, wireless charging module, electronic equipment, wireless charging system, and aims to improve the coupling coefficient of the coil.
In a first aspect, there is provided a coil including a first coil portion, a second coil portion, a surrounding axis of the first coil portion and a surrounding axis of the second coil portion being different, the first coil portion including a first connection end and a second connection end, the second coil portion including a third connection end and a fourth connection end, the second connection end and the third connection end being connected, along the surrounding axis of the first coil portion, and a winding direction of the first coil portion from the first connection end to the second connection end being a first winding direction, along the surrounding axis of the second coil portion, and a winding direction of the second coil portion from the third connection end to the fourth connection end being a second winding direction, the first winding direction and the second winding direction being the same.
In some embodiments, an end of the first coil portion near the second coil portion is connected to an end of the second coil portion near the second coil portion, the first coil portion includes a first peripheral point and a second peripheral point opposite to each other, a distance from the second coil portion to the first peripheral point is greater than a distance from the second coil portion to the second peripheral point, and a current direction of the first coil portion and a current direction of the second coil portion are current-continuous on both sides of a junction of the first coil portion and the second coil portion.
The first coil part may be formed around a surrounding axis of the first coil part, and the first coil part may have two opposite outer circumferential points in a cross section perpendicular to the first axis direction, and a line connecting the two opposite outer circumferential points may intersect the surrounding axis of the first coil. The line connecting the two opposite peripheral points may also be perpendicular with respect to the circumferential axis of the first coil. In this application, "vertical" may refer to substantially vertical, allowing for reasonable error; "parallel" may refer to substantially parallel, allowing for reasonable error.
The winding direction of the first coil portion may be determined by observing from the first coil portion to the second coil portion along a surrounding axis of the first coil (the first coil portion may be formed around in the first axis direction, the surrounding axis of the first coil portion may be parallel to the first axis direction, and the surrounding axis of the first coil portion may be perpendicular to the first direction from the first outer peripheral point to the second outer peripheral point). The winding direction of the second coil portion is viewed in a first direction from the first outer peripheral point to the second outer peripheral point.
Since the distances from the second coil portion to the opposite outer peripheral points of the first coil portion are different, any one of the turns of the wires of the second coil portion may be inclined or perpendicular (i.e., may not be parallel) with respect to any one of the turns of the wires of the first coil portion, and thus the direction of the magnetic flux passing through the second coil portion may be slightly different with respect to the direction of the magnetic flux passing through the first coil portion. Therefore, the coil provided by the application can adapt to magnetic force lines in more directions, and is beneficial to improving the coupling coefficient of the coil. The current direction generated by the first coil part and the current direction generated by the second coil part are identical in phase at the connection part between the first coil part and the second coil part, so that the current generated by the first coil part and the current generated by the second coil part can be mutually overlapped.
In some embodiments, the first coil portion is a cylindrical coil portion and the second coil portion is a flat coil. The second coil portion and the first coil portion are connected in series, the second coil portion is arranged in parallel with respect to a surrounding axis of the first coil portion, and the second coil portion and the first coil portion are arranged along the surrounding axis of the first coil portion.
The coil provided by the application can be suitable for a wireless charging system with a flat coil, and can also be suitable for a wireless charging system with a columnar coil, so that the coil is wide in applicable scene. The coil provided herein may have a relatively small footprint compared to a flat coil. Compared with a columnar coil, the coil provided by the application can have relatively excellent wireless charging performance.
With reference to the first aspect, in certain implementations of the first aspect, a surrounding axis of the first coil portion and a surrounding axis of the second coil portion are perpendicular to each other.
In some embodiments, any turn of wire of the second coil portion is disposed perpendicularly with respect to any turn of wire of the first coil portion.
In this application, the arbitrary round wire of second coil portion sets up perpendicularly for arbitrary round wire of first coil portion, and the coil that this application provided can be with the magnetic line of force coupling of two mutually perpendicular directions, is favorable to improving the coupling coefficient of coil.
With reference to the first aspect, in certain implementations of the first aspect, the second coil portion does not completely overlap the first coil portion as viewed in a direction perpendicular to a circumferential axis of the first coil portion.
In some embodiments, the second coil portion does not completely overlap the first coil portion in a first direction from the first peripheral point to the second peripheral point.
In the present application, the case where a and B do not overlap completely may be other cases than the case where a and B overlap completely, including the case where a and B intersect, and the region where a and B intersect is empty. The second coil portion and the first coil portion do not overlap completely in the first direction from the first outer peripheral point to the second outer peripheral point, and may mean that the first coil portion and the second coil portion are observed together in the first direction from the first outer peripheral point to the second outer peripheral point, and that the second coil portion and the first coil portion are observed together, meaning that at least part of the second coil portion is located outside the first coil portion. That is, the first coil portion and the second coil portion are observed in the first direction from the first outer peripheral point to the second outer peripheral point, and it can be observed that the projection of the second coil portion includes an area other than the projection of the first coil portion, that is, at least part of the projection of the second coil portion is located other than the projection of the first coil portion.
With reference to the first aspect, in certain implementations of the first aspect, the second coil portion does not completely overlap the first coil portion as viewed along a circumferential axis of the second coil portion. That is, the first coil portion and the second coil portion correspond to two different positions in a direction parallel to the circumferential axis of the second coil portion. The second coil part is located at one side of the first coil part as viewed in a direction perpendicular to a surrounding axis of the second coil part.
In this application, through the position of rationally setting up first coil portion and second coil portion, can be in the magnetic field of multiple direction of different position adaptation, be favorable to improving the mutual inductance of coil.
In some embodiments, the distance from the second coil portion to the first peripheral point is greater than the distance from the first peripheral point to the second peripheral point.
The relatively large distance from the second coil part to the first peripheral point is beneficial to enabling the coil provided by the application to adapt to the magnetic fields of other coils.
In some embodiments, in the first direction, the projection of the second coil portion is not connected to the projection of the first coil portion.
The first coil part and the second coil part can have a distance between orthographic projections of the first coil part in the circumferential axis direction, which is favorable for reducing the degree of magnetic force line direction conversion and further favorable for reducing magnetic loss.
With reference to the first aspect, in certain implementation manners of the first aspect, the coil further includes a third coil portion, a winding axis of the third coil portion is different from a winding axis of the second coil portion, the third coil portion is located on a side of the second coil portion away from the first coil portion, the third coil portion includes a fifth connection end and a sixth connection end, the fifth connection end is connected with a fourth connection end of the second coil portion, along the winding axis of the third coil portion, and a winding direction of the third coil portion from the fifth connection end to the sixth connection end is a third winding direction, and the third winding direction is opposite to the first winding direction.
In some embodiments, an end of the third coil portion proximate to the second coil portion is connected to an end of the second coil portion distal from the first coil portion. The third coil part comprises a third peripheral point and a fourth peripheral point which are opposite, the distance from the third peripheral point to the second coil part is larger than the distance from the fourth peripheral point to the second coil part, the second coil part and the third coil part are not completely overlapped in a second direction from the third peripheral point to the fourth peripheral point, the first coil part and the third coil part are positioned on the same side of the second coil part in a direction perpendicular to the first direction or the second direction, and the current direction of the third coil part and the current direction of the second coil part are continuous on two sides of the junction of the third coil part and the second coil part.
In some embodiments, the coil further includes a third coil part located along a winding axis of the first coil part on a side of the second coil part away from the first coil part, the first coil part and the third coil part being located on the same side of the second coil part in a direction perpendicular to the winding axis of the first coil part, the third coil part being connected in series with an end of the second coil part away from the first coil part, the winding axis of the third coil part being arranged in parallel with the winding axis of the first coil part, the winding direction of the third coil part being opposite to the winding direction of the first coil part.
In the application, the coil further comprises a third coil part, so that on one hand, the magnetic coupling coefficient of the coil can be further improved, and the coil can realize relatively better coupling performance in a relatively larger range; on the other hand, the coil may have a relatively symmetrical magnetic coupling property. In addition, reasonable wiring and winding are beneficial to considering the usability and the occupied space of the coil.
In some embodiments, any of the turns of wire of the third coil portion is disposed in parallel with respect to any of the turns of wire of the first coil portion.
The first coil part and the third coil part are arranged in parallel, so that the symmetry of the coil relative to the second coil is improved, and the symmetrical magnetic coupling performance of the coil is improved.
With reference to the first aspect, in certain implementations of the first aspect, the first coil portion and the third coil portion are located on a same side of the second coil portion. That is, the first coil portion, the second coil portion, and the third coil portion correspond to three different positions in the direction parallel to the surrounding axis of the second coil portion. The first coil portion and the third coil portion are located on the same side of the second coil portion as viewed in a direction perpendicular to a surrounding axis of the second coil portion.
In this application, through the position of reasonable setting third coil portion, can be in the magnetic field of multiple direction of different position adaptation, be favorable to improving the mutual inductance of coil.
With reference to the first aspect, in certain implementations of the first aspect, a surrounding axis of the third coil portion is disposed coaxially with a surrounding axis of the first coil portion.
In some embodiments, the first coil portion and the third coil portion are aligned in a direction perpendicular to the first direction or the second direction.
In the application, the first coil part and the third coil part are coaxially wound, so that the magnetic coupling symmetry of the coil is improved, and the magnetic coupling coefficient of the coil is also improved.
In a second aspect, a wireless charging module is provided, comprising a coil as described in any one of the implementations of the first aspect.
With reference to the second aspect, in certain implementations of the second aspect, the first coil portion is a cylindrical coil portion, and the wireless charging module further includes a cylindrical magnet passing through the first coil portion.
In this application, the columnar magnet may be a magnetic flux piece of the first coil portion, and the columnar magnet may be advantageous for enhancing the magnetic flux passing through the first coil portion.
With reference to the second aspect, in certain implementations of the second aspect, the second coil portion is located at one side of the columnar magnet.
In one embodiment, the columnar magnet includes a first portion passing through the first coil portion and a second portion located on one side of the second coil portion, and the second portion may be disposed opposite the second coil portion. An orthographic projection of the columnar magnet in a direction perpendicular to the circumferential axis of the first coil part may intersect the second coil part. The columnar magnet may cover at least part of the second coil portion, as seen in a direction perpendicular to the circumferential axis of the first coil portion.
In this application, the columnar magnet may also be a magnetic flux piece of the second coil portion, and the columnar magnet may be advantageous for enhancing the magnetic flux passing through the second coil portion. The second coil part and the first coil part can share one magnetic flux piece, so that the structural complexity of the wireless charging module is reduced, and the processing difficulty is reduced.
In a third aspect, an electronic device is provided, comprising a coil as described in any one of the implementations of the first aspect above.
With reference to the third aspect, in certain implementations of the third aspect, the electronic device further includes a circuit board assembly disposed opposite the second coil portion. That is, an orthographic projection of the circuit board assembly in a direction perpendicular to the circumferential axis of the first coil part may intersect or overlap with the second coil part. The circuit board assembly may cover at least part of the second coil part, seen in a direction perpendicular to the circumferential axis of said first coil part. In some embodiments, the circumferential axis of the first coil portion may pass through the circuit board assembly.
In some embodiments, a side of the circuit board assembly proximate to the second coil portion may be provided with a magnetic shield that may act as a magnetic flux piece for the second coil portion.
In this application, circuit board subassembly can be assembled with the coil, and circuit board subassembly can hold in the interval space of first coil portion and third coil portion, is favorable to reducing the overall occupation space of circuit board subassembly and coil.
In a fourth aspect, an electronic device is provided, including a first coil, the first coil includes a first coil portion, a second coil portion, a surrounding axis of the first coil portion is different from a surrounding axis of the second coil portion, the first coil portion includes a first connection end and a second connection end, the second coil portion includes a third connection end and a fourth connection end, the second connection end is connected with the third connection end, a voltage between the first connection end and the second connection end is a first voltage, a voltage between the third connection end and the fourth connection end is a second voltage, a voltage between the first connection end and the fourth connection end is a third voltage, and an absolute value of the third voltage is equal to a sum of an absolute value of the first voltage and an absolute value of the second voltage.
In this application, the voltage generated by the first coil part may be added to the voltage generated by the second coil part. The surrounding axis of the second coil part and the surrounding axis of the first coil part are different, and thus the direction of magnetic flux passing through the second coil part may be slightly different with respect to the direction of magnetic flux passing through the first coil part. Therefore, the coil provided by the application can adapt to magnetic force lines in more directions, and is beneficial to improving the coupling coefficient of the coil.
With reference to the fourth aspect, in certain implementations of the fourth aspect, the coil further includes a third coil portion, a surrounding axis of the third coil portion is different from a surrounding axis of the second coil portion, the third coil portion is located on a side of the second coil portion away from the first coil portion, the third coil portion includes a fifth connection end and a sixth connection end, the fifth connection end is connected with the fourth connection end of the second coil portion, a voltage between the fifth connection end and the sixth connection end is a fourth voltage, a voltage between the first connection end and the sixth connection end is a fifth voltage, and an absolute value of the fifth voltage is equal to a sum of an absolute value of the first voltage, an absolute value of the second voltage, and an absolute value of the fourth voltage.
In this application, the coil further includes a third coil portion, and the voltage generated by the third coil portion may be added to the voltages generated by the first coil portion and the second coil portion. On one hand, the magnetic coupling coefficient of the coil can be further improved, and the coil can realize relatively better coupling performance in a relatively larger range; on the other hand, the coil may have a relatively symmetrical magnetic coupling property. In addition, reasonable wiring and winding are beneficial to considering the usability and the occupied space of the coil.
In a fifth aspect, a wireless charging system is provided, comprising:
a first coil, the first wire being a coil as described in any one of the implementations of the first aspect above;
a second coil configured to magnetically couple with the first coil.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the second coil is disposed adjacent to and opposite to the second coil portion, and a surrounding axis of the second coil is in the same direction as a surrounding axis of the second coil portion.
In some embodiments, any turn of wire of the second coil is disposed in parallel with respect to any turn of wire of the second coil portion.
In some embodiments, the direction of winding of the second coil is opposite to the direction of winding of the second coil portion.
In some embodiments, the second coil is a flat coil.
The first coil can be coupled with the flat coil, and has relatively good coupling performance. The first coil provided herein may have a relatively smaller footprint than a flat coil. Compared with a columnar coil, the first coil provided by the application can have relatively better wireless charging performance. Wherein, in the direction perpendicular to the surrounding axis of the first coil part, the second coil part may be located at one side of the first coil part, and the second coil part may be disposed close to the second coil, which is advantageous for adapting the first coil to the magnetic field of the second coil.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a spacing between the second coil portion and the second coil is smaller than a spacing between the first coil portion and the second coil.
In this application, because a large amount of magnetic fields that the second coil sent just can wrap around to the second coil after bypassing certain region, will first coil portion with the interval setting of second coil is great relatively, is favorable to increasing the magnetic flux that passes first coil portion, and then is favorable to improving the coupling efficiency of first coil and second coil.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a central region of the second coil is disposed opposite the second coil portion.
The magnetic field intensity of the central area of the second coil is relatively strong, and the second coil part and the central area of the second coil are arranged oppositely, so that the coupling performance of the first coil and the second coil is improved.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a surrounding axis of the second coil is disposed coaxially with a surrounding axis of the second coil portion.
In the application, the second coil part and the second coil are coaxially wound, so that the magnetic coupling coefficient of the first coil and the second coil is improved.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the first coil portion is a cylindrical coil portion, and the wireless charging system further includes a flat magnet located on a side of the second coil remote from the first coil.
In this application, the flat magnet may be a magnetic flux piece of the second coil, and the flat magnet may be advantageous to enhance the magnetic flux passing through the second coil.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the second coil includes a fourth coil portion disposed opposite the first coil portion.
The first coil can be coupled with the columnar coil, and has relatively good coupling performance. The first coil provided herein may have a relatively smaller footprint than a flat coil. Compared with a columnar coil, the first coil provided by the application can have relatively better wireless charging performance. Wherein, in the direction perpendicular to the surrounding axis of the first coil part, the second coil part may be located at one side of the first coil part, and the second coil part may be disposed close to the second coil, which is advantageous for adapting the first coil to the magnetic field of the second coil.
With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the fourth coil portion includes a seventh connection end and an eighth connection end, the second coil further includes a fifth coil portion, a winding axis of the fifth coil portion is the same as a winding axis of the fourth coil portion, the fifth coil portion includes a ninth connection end and a tenth connection end, the eighth connection end and the ninth connection end are connected, a connection line between the eighth connection end and the ninth connection end is disposed opposite to the second coil portion, along the winding axis of the fourth coil portion, and a winding direction of the fourth coil portion from the seventh connection end to the eighth connection end is a fourth winding direction, and a winding direction of the fifth coil portion from the ninth connection end to the tenth connection end is a fifth winding direction, the fourth winding direction is opposite to the fifth winding direction.
In some embodiments, any of the turns of wire of the fifth coil portion are disposed in parallel with respect to any of the turns of wire of the fourth coil portion.
In some embodiments, the second coil further includes a fifth coil part located at both sides of the second coil part along a surrounding axis of the fourth coil part, the fourth coil part and the fifth coil part being located at the same side of the second coil part in a direction perpendicular to the surrounding axis of the fourth coil part, the surrounding axis of the fifth coil part being disposed in parallel with the surrounding axis of the fourth coil part.
In some embodiments, the fourth coil portion and the fifth coil portion may be connected in series or in parallel.
In some embodiments, the current direction of the fifth coil portion is current continuous with the current direction of the fourth coil portion on both sides of the junction of the fifth coil portion and the fourth coil portion.
In the application, the second coil further comprises a fifth coil part, so that on one hand, the magnetic coupling coefficient of the first coil and the second coil can be further improved, and the first coil and the second coil can realize relatively better coupling performance in a relatively larger range; on the other hand, the first coil and the second coil may have relatively symmetrical magnetic coupling properties.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the second coil further includes a sixth coil portion, a surrounding axis of the sixth coil portion being different from a surrounding axis of the fourth coil portion, the sixth coil portion being disposed proximate to and opposite the second coil portion,
the sixth coil portion includes an eleventh connection end and a twelfth connection end, the eleventh connection end is connected with the eighth connection end, along a winding axis of the fourth coil portion, and seen in a direction from the fourth coil portion to the sixth coil portion, a winding direction of the fourth coil portion from the seventh connection end to the eighth connection end is a fourth winding direction, along the winding axis of the sixth coil portion, and seen in a direction from the fourth coil portion to the sixth coil portion, a winding direction of the sixth coil portion from the eleventh connection end to the twelfth connection end is a sixth winding direction, and the sixth winding direction and the fourth winding direction are the same.
In some embodiments, an end of the sixth coil portion near the fourth coil portion and an end of the fourth coil portion near the sixth coil portion are connected, the fourth coil portion includes a fifth outer peripheral point and a sixth outer peripheral point opposite to each other, a distance from the fifth outer peripheral point to the sixth coil portion is greater than a distance from the sixth outer peripheral point to the sixth coil portion, the sixth coil portion and the fourth coil portion do not completely overlap in a third direction from the fifth outer peripheral point to the sixth outer peripheral point, and a current direction of the sixth coil portion is current-continuous with a current direction of the fourth coil portion on both sides of a junction of the sixth coil portion and the fourth coil portion.
The first coil can be coupled with the second coil with a similar structure, and has relatively good coupling performance. The first coil and the second coil provided herein may have a relatively smaller footprint than a flat coil. Compared with a columnar coil, the first coil and the second coil provided by the application can have relatively better wireless charging performance. Wherein, in the direction perpendicular to the surrounding axis of the first coil part, the second coil part may be located at one side of the first coil part, and the second coil part may be disposed close to the sixth coil part, which is advantageous for adapting the first coil to the magnetic field of the second coil. Reasonable wiring and winding are beneficial to considering the usability and the occupied space of the coil.
In some embodiments, the sixth coil part and the fourth coil part are connected in series, the sixth coil part is disposed in parallel with respect to a winding axis of the fourth coil part, the sixth coil part and the fourth coil part are arranged along the winding axis of the fourth coil part, the sixth coil part is located at one side of the fourth coil part in a direction perpendicular to the winding axis of the fourth coil part, and a winding direction of the fourth coil part is opposite to a winding direction of the sixth coil part.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a surrounding axis of the sixth coil portion is perpendicular to a surrounding axis of the fourth coil portion.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a surrounding axis of the sixth coil portion is parallel to a surrounding axis of the second coil portion.
In some embodiments, any of the coils of the sixth coil portion is disposed in parallel with any of the coils of the second coil portion.
In some embodiments, the sixth coil portion is disposed adjacent to and parallel to the second coil portion.
In this application, second coil portion and sixth coil portion parallel arrangement are favorable to improving wireless charging system's symmetry, and then are favorable to improving wireless charging system's symmetrical magnetic coupling performance.
With reference to the fifth aspect, in certain implementations of the fifth aspect, a distance between the second coil portion and the sixth coil portion is smaller than a distance between the first coil portion and the fourth coil portion.
In this application, because a large amount of magnetic fields that sixth coil portion sent just can wrap around to sixth coil portion after bypassing certain region, will first coil portion with the interval setting of fourth coil portion is great relatively, is favorable to increasing by sixth coil portion emission and pass the magnetic flux of first coil portion, and then is favorable to improving the coupling efficiency of first coil and second coil.
In some embodiments, the circumferential axis of the sixth coil portion is the same as the circumferential axis of the second coil portion.
In the application, the second coil part and the sixth coil part are coaxially wound, so that the magnetic coupling coefficient of the first coil and the second coil is improved.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the second coil further includes a fifth coil portion, a winding axis of the fifth coil portion is different from a winding axis of the sixth coil portion, the fifth coil portion is located on a side of the sixth coil portion away from the fourth coil portion, the fifth coil portion includes a ninth connection end and a tenth connection end, the twelfth connection end and the ninth connection end of the sixth coil portion are connected, along the winding axis of the fifth coil portion, and a winding direction of the fifth coil portion from the ninth connection end to the tenth connection end is a fifth winding direction, the fifth winding direction is opposite to the fourth winding direction as viewed from the sixth coil portion to the fifth coil portion.
In some embodiments, the fifth coil part is located at a side of the sixth coil part remote from the fourth coil part, an end of the fifth coil part near the sixth coil part is connected to an end of the sixth coil part remote from the fourth coil part, the sixth coil part includes a seventh outer peripheral point and an eighth outer peripheral point opposite to each other, a distance from the seventh outer peripheral point to the sixth coil part is greater than a distance from the eighth outer peripheral point to the sixth coil part, the fifth coil part does not entirely overlap with the sixth coil part in a fourth direction from the seventh outer peripheral point to the eighth outer peripheral point, and the fourth coil part and the fifth coil part are located at the same side of the sixth coil part in a direction perpendicular to the third direction or the fourth direction, and a current direction of the fifth coil part and a current direction of the sixth coil part are continuous at both sides of the connection of the fifth coil part and the sixth coil part.
In some embodiments, along a winding axis of the fourth coil part, the fifth coil part is located at a side of the sixth coil part away from the fourth coil part, the fourth coil part and the fifth coil part are located at the same side of the sixth coil part in a direction perpendicular to the winding axis of the fourth coil part, the fifth coil part is connected in series with an end of the sixth coil part away from the fourth coil part, the winding axis of the fifth coil part is arranged in parallel with the winding axis of the fourth coil part, and a winding direction of the fifth coil part is opposite to a winding direction of the fourth coil part.
In the application, the second coil further comprises a fifth coil part, so that on one hand, the magnetic coupling coefficient of the first coil and the second coil can be further improved, and the first coil and the second coil can realize relatively better coupling performance in a relatively larger range; on the other hand, the first coil and the second coil may have relatively symmetrical magnetic coupling properties.
In some embodiments, the encircling axis of the fifth coil portion is the same as the encircling axis of the fourth coil portion.
In the application, the fourth coil part and the fifth coil part are coaxially wound, so that the magnetic coupling symmetry of the first coil and the second coil is improved, and the magnetic coupling symmetry of the first coil and the second coil is also improved.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the first coil portion is a cylindrical coil portion, and the wireless charging system further includes a cylindrical magnet passing through the first coil portion.
In a sixth aspect, a wireless charging system is provided, comprising: a first electronic device, which is an electronic device as described in any implementation manner of the first aspect; a second electronic device including the second coil, the second coil configured to magnetically couple with the first coil.
Drawings
Fig. 1 is a schematic block diagram of a wireless charging system provided herein.
Fig. 2 is a schematic block diagram of another wireless charging system provided herein.
Fig. 3 is a schematic perspective view of a wireless charging system provided in the present application.
Fig. 4 is a front view of a wireless charging system provided herein.
Fig. 5 is a top view of a wireless charging system provided herein.
Fig. 6 is a side view of a wireless charging system provided herein.
Fig. 7 is an electrical coupling schematic diagram of a wireless charging system provided herein.
Fig. 8 is a schematic diagram of magnetic coupling of a wireless charging system provided in the present application.
Fig. 9 is a schematic diagram of coupling performance of a wireless charging system provided in the present application.
Fig. 10 is a schematic perspective view of a wireless charging system provided in the present application.
Fig. 11 is a schematic perspective view of another wireless charging system provided in the present application.
Fig. 12 is a schematic diagram of electrical coupling of another wireless charging system provided herein.
Fig. 13 is a schematic diagram of magnetic coupling of another wireless charging system provided herein.
Fig. 14 is a schematic perspective view of another wireless charging system provided in the present application.
Fig. 15 is a schematic diagram of electrical coupling of another wireless charging system provided herein.
Fig. 16 is a schematic diagram of magnetic coupling of another wireless charging system provided herein.
Fig. 17 is a schematic structural diagram of an electronic device provided in the present application.
Fig. 18 is a schematic perspective view of still another wireless charging system provided in the present application.
Fig. 19 is a schematic diagram of electrical coupling of yet another wireless charging system provided herein.
Fig. 20 is a schematic diagram of magnetic coupling of yet another wireless charging system provided herein.
Fig. 21 is a schematic perspective view of still another wireless charging system provided in the present application.
Fig. 22 is a schematic diagram of electrical coupling of yet another wireless charging system provided herein.
Fig. 23 is a schematic diagram of magnetic coupling of yet another wireless charging system provided herein.
Fig. 24 is a schematic perspective view of still another wireless charging system provided in the present application.
Fig. 25 is a schematic diagram of electrical coupling of yet another wireless charging system provided herein.
Fig. 26 is a schematic diagram of magnetic coupling of yet another wireless charging system provided herein.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
The embodiment of the application provides a wireless charging system 100, as shown in fig. 1 and 2. Wireless charging system 100 may include a wireless charging transmitting device 110 and a wireless charging receiving device 120. The wireless charging transmitting device 110 and the wireless charging receiving device 120 may be electronic devices, such as a stylus, a mobile phone, smart glasses, a tablet computer, an electronic reader, a notebook computer, a digital camera, a vehicle-mounted device, a television, a wireless charger or a wearable device, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, and the like, which have a wireless charging function.
Fig. 1 illustrates a wireless charging system 100 provided in an embodiment of the present application. The embodiment shown in fig. 1 is illustrated by taking the example that the wireless charging transmitting device 110 is a tablet computer and the wireless charging receiving device 120 is a stylus.
Wireless charging transmitting device 110 may include a housing 111, a display 112. The display 112 may be mounted on the housing 111. In the embodiment shown in fig. 1, the housing 111 may include a bezel and a rear cover. The frame surrounds the periphery at the display screen 112 and surrounds the periphery at the back lid, and display screen 112 and back lid interval set up, and back lid and display screen 112 are located the both sides of frame respectively. The cavity formed between the display 112, the bezel, the back cover may be used to house electronic or physical devices, wireless charging modules 113, batteries, and the like. The wireless charging module 113 may include a transmitting coil. The wireless charging module 113 may supply power to the battery of the wireless charging transmitting device 110 through the transmitting coil, so as to implement a wireless charging function of the wireless charging transmitting device 110.
The wireless charging receiving device 120 may include a housing 121, a wireless charging module 122. The wireless charging module 122 may be accommodated in the housing 121. In some embodiments, other electronic or physical devices, such as batteries, may also be housed within the housing 121. The wireless charging module 122 may be configured to power the battery of the wireless charging receiving device 120 to implement the wireless charging function of the wireless charging receiving device 120.
In the embodiment shown in fig. 1, the display screen 112 of the wireless charging transmitting device 110 may also display a wireless charging interface, which may indicate, for example, that the wireless charging transmitting device 110 is currently charging the wireless charging receiving device 120 wirelessly, and may also indicate the current power of the wireless charging receiving device 120.
Fig. 2 illustrates another wireless charging system 100 provided in an embodiment of the present application. The embodiment shown in fig. 2 is illustrated by taking an example in which the wireless charging transmitting device 110 is a glasses case and the wireless charging receiving device 120 is smart glasses.
Wireless charging transmitting device 110 may include a housing 111, a wireless charging module 113. The wireless charging module 113 may be fixed to the housing 111, for example, fixed to an inner wall of the housing 111. The housing 111 may also be used to house eyeglasses, such as the wireless charge receiving device 120 shown in fig. 2.
The wireless charging receiving device 120 may include a frame 123, a temple 124, and a lens 125. The number of temples 124 may be one or more. In the embodiment shown in fig. 2, the number of temples 124 may be plural. The lens 125 is fixed to the frame 123.
One end of the temple 124 may be rotatably connected to one end of the frame 123 by a connection shaft so that the temple 124 can be switched between an unfolded state and a folded state. In some embodiments, one end of the temple 124 may be detachably connected to one end of the frame 123 by a connecting shaft. When the temple 124 is in the extended state, the temple 124 can be worn at the user's ear. Fig. 2 is a schematic view of the temple 124 in a folded state. When the temple 124 is in the folded state, the temple 124 is folded with respect to the mirror frame 123. In some embodiments, the temples 124 are in a folded state to facilitate the storage of the smart glasses 100 in a glasses case (e.g., the wireless charging transmitting device 110 shown in fig. 2, or a common glasses case).
The temples 124 may have electronic devices (not shown) such as a motherboard, a wireless charging module 122, a battery, etc. The main board can be provided with a voice control module, a gesture recognition module, an eye movement tracking module and the like. The battery is used as a power source to provide power to the temples 124. The wireless charging module 122 may include a receiving coil, through which the wireless charging module 122 may charge the battery. In some embodiments, the battery may be located at an end of the temple that is distal from the frame, and the wireless charging module 122 and motherboard may be located at an end of the temple that is proximal to the frame.
In some possible scenarios, the smart glasses may be augmented reality (augmented reality, AR) smart glasses. When the smart glasses are worn on the head of the user, the user can see an image presented by a display unit (not shown in the figure) of the smart glasses. That is, the user can view not only the real world scene through the smart glasses, but also the image of the virtual world through the smart glasses. In some embodiments, the user may also augment the real world viewing effect by displaying virtual images through the smart glasses. In other possible scenarios, the smart glasses may not be limited to AR smart glasses, but may be other smart glasses, VR smart glasses that implement Virtual Reality (VR) effects, or smart glasses that implement Mixed Reality (MR) effects, smart glasses with audio functions, and the like.
The principle of wireless charging of the wireless charge transmitting device 110 to the wireless charge receiving device 120 is explained below in conjunction with the wireless charging system 100 shown in fig. 1 and 2.
During wireless charging of wireless charging transmitting device 110 to wireless charging receiving device 120, wireless charging transmitting device 110 may be in close proximity to wireless charging receiving device 120 such that a transmitting coil of wireless charging transmitting device 110 may be coupled with a receiving coil of wireless charging receiving device 120.
In the embodiment shown in fig. 1, a magnetic attraction component may be disposed near the frame of the wireless charging transmitting device 110, and the magnetic attraction component may be used to attract the wireless charging receiving device 120 to the frame of the wireless charging transmitting device 110, so that the transmitting coil of the wireless charging transmitting device 110 may be stably coupled with the receiving coil of the wireless charging receiving device 120.
In the embodiment shown in fig. 2, the wireless charging receiving device 120 may be folded and accommodated in the accommodating cavity of the wireless charging transmitting device 110, and the wireless charging module 122 of the wireless charging receiving device 120 may be disposed close to the wireless charging module 113 of the wireless charging transmitting device 110, so that the transmitting coil of the wireless charging transmitting device 110 may be stably coupled with the receiving coil of the wireless charging receiving device 120.
The wireless charging module 113 may transmit a varying magnetic field through the transmitting coil. The coil of the wireless charging module 122 can sense the magnetic field from the wireless charging module 113 and generate an induced current. The wireless charging module 122 may transmit the induced current generated by the coil to other devices, such as a battery, in the wireless charging receiving device 120. In this scenario, the coil of the wireless charging transmitting device 110 may be a transmitting coil and the coil of the wireless charging receiving device 120 may be a receiving coil.
In some embodiments, the wireless charging transmitting device 110 may also be a wireless charging receiving device, i.e. other devices may wirelessly charge the wireless charging module 113. The coil of the wireless charging module 113 can induce a magnetic field from other devices and generate an induced current. The wireless charging module 113 can transmit the induced current generated by the coil to other devices in the wireless charging module 113. In this scenario, the coil of the wireless charging transmitting device 110 may be a receiving coil. That is, the coil of the wireless charging transmitting device 110 may serve as both a transmitting coil and a receiving coil. For example, in the embodiment shown in fig. 1, the tablet computer may obtain power from a wireless charger through the wireless charging module 113. As another example, in the embodiment shown in fig. 2, the eyeglass case may draw power from a wireless charger via a wireless charging module 113.
In other embodiments, the wireless charging receiving device 120 may also be a wireless charging transmitting device, i.e. the wireless charging module 122 may wirelessly charge other devices. The coil of the wireless charging module 122 may emit a varying magnetic field so that the wireless charging receiving device 120 may wirelessly charge other devices. In this scenario, the coil of the wireless charging receiving device 120 may be a transmitting coil. That is, the coil of the wireless charging receiving device 120 may serve as both a receiving coil and a transmitting coil. For example, in the embodiment shown in fig. 1, the stylus may wirelessly charge other devices through the wireless charging module 122. As another example, in the embodiment shown in fig. 2, the smart glasses may wirelessly charge other devices through the wireless charging module 12.
In some embodiments provided herein, the coil may be a loop winding made of tightly wound wire. The periphery of the wire can be wrapped by insulating materials.
In some possible scenarios, the coil of wire wound may be a flat coil or a cylindrical coil.
The flat coil may have a relatively small thickness and have a relatively large length and width. For example, the thickness of the flat coil may be less or much less than the length or width of the flat coil. The cylindrical coil may have a relatively small length and width and a relatively large thickness. For example, the thickness of the cylindrical coil may be slightly less than, equal to, or greater than the length or width of the flat coil.
The wire-wound flat coil may include a plurality of wire loops connected in series. The plurality of wire loops may be circumferentially disposed about a central axis of the flat coil. The central axis of the flat coil may be the circumferential axis of the wire. In some embodiments, the thickness of the flat coil may be approximately or substantially the same as the thickness of the individual wire loops. The outer diameters of the plurality of wire loops may be different from each other. The outer diameter of the inner loop of wire may be smaller than the outer diameter of the outer loop of wire.
In some embodiments, the plurality of wire loops may include a first wire loop and a second wire loop, the first wire loop having an outer diameter that is greater than an outer diameter of the second wire loop. The first wire loop surrounds the periphery of the second wire loop and is coplanar with the second wire loop. One end of the first wire ring is connected with one end of the second wire ring; the other end of the first wire loop may be connected to a third wire loop having an outer diameter larger than the first wire loop (among the plurality of wire loops, the third wire loop may be a wire loop having an outer diameter that is the smallest among all of the wire loops having an outer diameter larger than the first wire loop); the other end of the second wire loop may be connected to a fourth wire loop having an inner diameter smaller than that of the second wire loop (the fourth wire loop may be a wire loop having an outer diameter smaller than that of the largest of all the wire loops of the second wire loop among the plurality of wire loops).
In the wire-wound cylindrical coil, the wire may be spirally wound with respect to the central axis of the cylindrical coil. The central axis of the cylindrical coil may be the circumferential axis of the wire. The wire-wound cylindrical coil may include a plurality of wire loops connected in series. The plurality of wire loops may be aligned along a central axis of the cylindrical coil. The outer diameters of the plurality of wire loops may be substantially the same. The outer diameter of the cylindrical coil may be approximately or substantially the same as the outer diameter of the individual wire loops.
In some embodiments, the plurality of wire loops may include adjacent fifth and sixth wire loops. The fifth wire loop may be spaced apart from the sixth wire loop along the central axis of the cylindrical coil. One end of the fifth wire loop is connected with one end of the sixth wire loop; the other end of the fifth wire loop may be connected to a seventh wire loop located at a side of the fifth wire loop remote from the sixth wire loop (among the plurality of wire loops, the seventh wire loop may be a wire loop closest to the fifth wire loop among all wire loops located at a side of the fifth wire loop remote from the sixth wire loop); the other end of the sixth wire loop may be connected to an eighth wire loop located at a side of the sixth wire loop remote from the fifth wire loop (among the plurality of wire loops, the eighth wire loop may be a wire loop closest to the sixth wire loop among all wire loops located at a side of the sixth wire loop remote from the fifth wire loop).
In other embodiments provided herein, the coil may be made of a circuit board. The circuit board-made coil may include conductive layers and insulating layers arranged in a stacked manner at intervals. The number of conductive layers may be plural, and the number of insulating layers may be plural. An insulating layer is arranged between two adjacent conductive layers, and a conductive layer is arranged between two adjacent insulating layers. Either conductive layer may include convoluted traces. The insulating layer may carry two conductive layers adjacent to the insulating layer. The conductive layer may be a coil layer forming a coil.
In some possible scenarios, the circuit board-made coil may be a flat coil or a cylindrical coil.
In the present application, a flat coil may refer to a coil type having a dimension in a thickness direction (a direction parallel to a circumferential axis of the coil) that is significantly smaller than a dimension in a length/width direction. The flat coil made of the circuit board may include one or more coil layers. A plurality of loop wires (which may also be referred to as a loop of wire) may be provided on the coil layer. The plurality of loop wires may be disposed circumferentially about the central axis of the flat coil. The central axis of the flat coil may be the circumferential axis of the annular circuit. In one embodiment provided herein, the flat coil may be mosquito coil shaped. The outer diameters of the plurality of loop wires of the flat coil may be different from each other. The outer diameter of the annular line of the inner ring may be smaller than the outer diameter of the annular line of the outer ring. In the case where the flat coil includes a plurality of coil layers, adjacent two coil layers may be electrically connected by a via penetrating the insulating layer. In one embodiment provided herein, a plurality of annular wires of a flat coil may be stacked along a circumferential axis of the flat coil, and a total number of stacked plurality of annular wires may be relatively small, such that a thickness of the flat coil may be significantly smaller than an outer diameter of the annular wires. In other embodiments provided herein, the flat coil may also be wound in other ways. The embodiment of the application can be not limited to a specific winding mode of the flat coil.
In some embodiments, the plurality of annular lines may include a first annular line and a second annular line, the first annular line having an outer diameter that is greater than an outer diameter of the second annular line. The first annular line may surround the outer circumference of the second annular line and be coplanar with the second annular line. One end of the first annular circuit is connected with one end of the second annular circuit; the other end of the first ring line may be connected to a third ring line having an outer diameter larger than the first ring line (the third ring line may be a ring line having a smallest outer diameter among all ring lines having an outer diameter larger than the first ring line among the plurality of ring lines); the other end of the second ring line may be connected to a fourth ring line having an inner diameter smaller than that of the second ring line (the fourth ring line may be a ring line having an outer diameter smaller than that of the largest of all ring lines of the second ring line among the plurality of ring lines).
In the present application, a columnar coil may refer to a coil type in which the dimension in the thickness direction (direction parallel to the circumferential axis of the coil) is slightly smaller than or equal to or larger than the dimension in the length/width direction. The columnar coil made of the circuit board may include a plurality of coil layers stacked. Each coil layer may include an annular line disposed circumferentially about the central axis of the cylindrical coil. The central axis of the cylindrical coil may be the circumferential axis of a plurality of annular lines. The outer diameters of the plurality of annular lines on the plurality of coil layers may be substantially the same. The outer diameter of the cylindrical coil may be approximately or substantially the same as the outer diameter of the individual annular lines. The total number of laminations of the plurality of annular lines may be relatively large such that the thickness of the cylindrical coil may be slightly less than or equal to or greater than the outer diameter of the annular line.
In some embodiments, the plurality of ring lines may include adjacent fifth ring lines and sixth ring lines. The fifth loop line may be spaced apart from the sixth loop line along the central axis of the cylindrical coil. One end of the fifth annular line is connected with one end of the sixth annular line through a first conducting piece; the other end of the fifth ring line may be connected to a seventh ring line through a second conductive member, the seventh ring line being located at a side of the fifth ring line away from the sixth ring line (among the plurality of ring lines, the seventh ring line may be a ring line closest to the fifth ring line among all ring lines located at the side of the fifth ring line away from the sixth ring line); the other end of the sixth ring line may be connected to the eighth ring line through a third conductive member, the eighth ring line being located at a side of the sixth ring line away from the fifth ring line (among the plurality of ring lines, the eighth ring line may be a ring line closest to the sixth ring line among all ring lines located at the side of the sixth ring line away from the fifth ring line).
The wireless charging module may also include a magnet in some embodiments. The magnet may be a kind of magnetic shield. The magnet may be a soft magnetic material.
In one possible embodiment, the wireless charging module may include a flat magnet, and the flat coil may be disposed on the flat magnet. The flat magnet may be a magnetic plate of a flat coil.
In one possible embodiment, the wireless charging module may include a cylindrical magnet, the cylindrical coil may surround an outer periphery of the cylindrical magnet, and the cylindrical magnet may pass through a space surrounded by the cylindrical coil. The columnar magnet may be a core of a columnar coil.
A wireless charging system 100 according to an embodiment of the present application is described below with reference to fig. 3 to 6. Fig. 3 is a schematic perspective view of a wireless charging system 100 according to an embodiment of the present application. Fig. 4 is a front view of one wireless charging system 100 shown in fig. 3. Fig. 5 is a top view of one wireless charging system 100 shown in fig. 3. Fig. 6 is a side view of one wireless charging system 100 shown in fig. 3.
The wireless charging system 100 may include a first wireless charging module 200 and a second wireless charging module 300. The first wireless charging module 200 may be a wireless charging module of the first wireless charging device. The second wireless charging module 300 may be a wireless charging module of a second wireless charging device. The first wireless charging module 200 may include a first coil 210. The first coil 210 may have a columnar shape as a whole, for example. The second wireless charging module 300 may include a second coil 310. In the embodiment shown in fig. 3, the second coil 310 may be a flat coil.
In one embodiment, the first wireless charging module 200 may be the wireless charging module 122 shown in fig. 1 or fig. 2, and the first coil 210 may be a receiving coil; the second wireless charging module 300 may be the wireless charging module 113 shown in fig. 1 or fig. 2, and the second coil 310 may be a transmitting coil. In another embodiment, the first wireless charging module 200 may be the wireless charging module 113 shown in fig. 1 or fig. 2, and the first coil 210 may be a transmitting coil; the second wireless charging module 300 may be the wireless charging module 122 shown in fig. 1 or fig. 2, and the second coil 310 may be a receiving coil. The first coil 210 is taken as a receiving coil, and the second coil 310 is taken as a transmitting coil. Embodiments in which the first coil 210 is a transmitting coil and the second coil 310 is a receiving coil may refer to embodiments provided herein.
The first coil 210 may include a first end 201 and a second end 202. The first end 201 and the second end 202 may be electrically connected with a first target device within the first wireless charging apparatus to transmit electrical signals between the first coil 210 and the first target device.
The second coil 310 may include a third end 301 and a fourth end 302. The third and fourth ends 301, 302 may be electrically connected to a second target device within the second wireless charging apparatus to transmit electrical signals between the first coil 210 and the second target device.
The first coil 210 may include a first coil part 211, a third coil part 212, and a second coil part 213 connected in series. In the embodiment shown in fig. 3, the first coil portion 211 and the third coil portion 212 may each be a columnar coil portion, and the second coil portion 213 may be a flat coil portion. In some embodiments, the first and third coil parts 211, 212 may be referred to as horizontal coils (the surrounding axes of the first and third coil parts 211, 212 are relatively horizontal), and the second coil part 213 may be referred to as vertical coils (the surrounding axes of the second coil part 213 are relatively vertical). In other embodiments, the first and third coil parts 211 and 212 may be referred to as parallel coils (the surrounding axes of the first and third coil parts 211 and 212 are parallel to each other), and the second coil part 213 may be referred to as vertical coils (the surrounding axis of the second coil part 213 is perpendicular to the surrounding axes of the first and third coil parts 211 and 212). The second coil part 213 shown in fig. 3 may be an example, and the second coil part 213 may also be a mosquito coil-like flat coil part. In other possible embodiments, the thickness of the second coil portion 213 may also be increased or decreased.
The second coil part 213 may be connected in series between the first coil part 211 and the third coil part 212.
The first coil part 211 may include a first connection end 2111 distant from the second coil part 213 and a second connection end 2112 close to the second coil part 213. The second coil part 213 may include a third connection end 2131 near the first coil part 211 and a fourth connection end 2132 far from the first coil part 211. The second connection end 2112 and the third connection end 2131 may be connected. That is, one end of the first coil portion 211 adjacent to the second coil portion 213 is connected to the second coil portion 213, and one end of the second coil portion 213 adjacent to the first coil portion 211 is connected to the first coil portion 211. In some embodiments, the second connection end 2112 and the third connection end 2131 may overlap.
The third coil part 212 may include a fifth connection end 2121 near the second coil part 213 and a sixth connection end 2122 far from the second coil part 213. The fifth connection 2121 may be connected to the fourth connection 2132. That is, an end of the third coil portion 212 close to the second coil portion 213 is connected to an end of the second coil portion 213 distant from the first coil portion 211. The first end 201 of the first coil 210 may be an end of the first coil portion 211 remote from the second coil portion 213. The second end 202 of the first coil 210 may be an end of the third coil portion 212 remote from the second coil portion 213. In some embodiments, fifth link 2121 and fourth link 2132 may overlap.
As shown in fig. 4, the first coil part 211 may be formed by spirally winding around the first winding shaft 2110. The first coil portion 211 may have two opposite peripheral points, such as a first peripheral point 2113 and a second peripheral point 2114, in a cross section perpendicular to the first circumferential axis 2110. A line connecting the first outer circumferential point 2113 and the second outer circumferential point 2114 may intersect the first circumferential axis 2110. The line connecting the first outer perimeter point 2113 and the second outer perimeter point 2114 may also be perpendicular relative to the first circumferential axis 2110. In this application, "vertical" may refer to substantially vertical, allowing for reasonable error; "parallel" may refer to substantially parallel, allowing for reasonable error.
As shown in fig. 4, the third coil portion 212 may be formed by spirally winding around the second winding shaft 2120. The third coil portion 212 may have two opposite peripheral points, such as a third peripheral point 2123 and a fourth peripheral point 2124, in a cross section perpendicular to the second circumferential axis 2120. A line connecting third peripheral point 2123 and fourth peripheral point 2124 may intersect second circumferential axis 2120. The line connecting the third peripheral point 2123 and the fourth peripheral point 2124 may also be perpendicular with respect to the second circumferential axis 2120.
In some embodiments, the first coil portion 211 and the third coil portion 212 may be made in coaxial helical windings. That is, the surrounding axis of the first coil portion 211 and the surrounding axis of the third coil portion 212 may be the same (including the same base). The first and second surround shafts 2110, 2120 may be coaxially disposed; alternatively, the first and second surround shafts 2110, 2120 may be disposed in parallel with a small or negligible spacing between the first and second surround shafts 2110, 2120 in a direction perpendicular to either the first or second surround shafts 2110, 2120. In other embodiments, the first surrounding shaft 2110 of the first coil portion 211 and the second surrounding shaft 2120 of the third coil portion 212 may be oriented differently.
The distance from the second coil part 213 to the first outer circumferential point 2113 may be greater than the distance from the second coil part 213 to the second outer circumferential point 2114. That is, the second coil portion 213 may be disposed at a position of the first coil portion 211 near the second outer peripheral point 2114, distant from the first outer peripheral point 2113. The distance from the second coil portion 213 to a certain outer peripheral point may be determined by the distance from the center of the second coil portion 213 to the outer peripheral point. The distance from the second coil portion 213 to a certain outer peripheral point may also be determined by the distance from the plane of the second coil portion 213 closest to the first coil portion 211 in which the coil of wire is located to the outer peripheral point.
In some embodiments, the first coil part 211 and the second coil part 213 may not completely overlap, as viewed in a direction perpendicular to the circumferential axis of the first coil part 211. That is, the projection of the first coil portion 211 and the projection of the second coil portion 213 may intersect or not overlap at all, as viewed in a direction perpendicular to the circumferential axis of the first coil portion 211. Thereby facilitating easier passage of the magnetic flux lines through the first coil part 211 and the second coil part 213 when the magnetic flux lines are deflected, to facilitate improvement of the magnetic coupling performance of the first coil 210.
In other embodiments provided herein, the first coil part 211 and the second coil part 213 may be entirely overlapped or overlapped with each other or disposed opposite to each other, as viewed in a direction perpendicular to the circumferential axis of the first coil part 211. That is, the projection of the first coil portion 211 and the projection of the second coil portion 213 may be the same, or the projection of the first coil portion 211 may be within the projection of the second coil portion 213, or the projection of the second coil portion 213 may be within the projection of the first coil portion 211, as viewed in a direction perpendicular to the circumferential axis of the first coil portion 211.
The distance from the second coil portion 213 to the first outer circumferential point 2113 may be greater than the distance from the first outer circumferential point 2113 to the second outer circumferential point 2114. That is, the second coil portion 213 is relatively far from the first outer peripheral point 2113. The first coil portion 211 and the second coil portion 213 may not be entirely overlapped as viewed along the circumferential axis of the first coil portion 211. In some embodiments, the second coil part 213 may be partially or entirely located outside the interval space of the first and third coil parts 211 and 212. In the embodiment shown in fig. 3, the first coil part 211, the second coil part 213, and the third coil part 212 are projected in a direction perpendicular to the circumferential axis of the first coil part 211 or the third coil part 212, and the projection of the second coil part 213 may be located at one side of the projection of the first coil part 211 or the projection of the third coil part 212. In other possible embodiments, the projection of the second coil portion 213 may intersect the projection of the first coil portion 211 or the projection of the third coil portion 212.
In addition, the distance from the second coil portion 213 to the third outer circumferential point 2123 may be greater than the distance from the second coil portion 213 to the fourth outer circumferential point 2124. The third peripheral point 2123 may be disposed opposite the first peripheral point 2113 and the fourth peripheral point 2124 may be disposed opposite the second peripheral point 2114. That is, in a direction perpendicular to the first direction from the first outer circumferential point 2113 to the second outer circumferential point 2114, or a direction perpendicular to the second direction from the third outer circumferential point 2123 to the fourth outer circumferential point 2124, that is, along the encircling axis 2110 of the first coil part 211 or the encircling axis 2120 of the third coil part 212, the first coil part 211 and the third coil part 212 may be located on the same side of the second coil part 213. In some embodiments, the second coil part 213 may be partially or entirely located outside the interval space of the first and third coil parts 211 and 212. In other embodiments, the first coil part 211 and the third coil part 212 are disposed in alignment in a direction perpendicular to the first direction or the second direction.
The second coil part 213 may not entirely overlap the first coil part 211, as viewed in a first direction (the first direction may be perpendicular to the first surrounding axis 2110 of the first coil part 211) from the first outer peripheral point 2113 to the second outer peripheral point 2114. In the present application, the case where a and B do not overlap completely may be other cases than the case where a and B overlap completely, including the case where a and B intersect, and the region where a and B intersect is empty.
That is, when the first coil portion 211 and the second coil portion 213 are viewed in the first direction from the first outer peripheral point 2113 to the second outer peripheral point 2114, the first coil portion 211 and the second coil portion 213 can be viewed together, that is, at least a part of the second coil portion 213 is located outside the first coil portion 211. That is, as the first coil portion 211 and the second coil portion 213 are observed in the first direction from the first outer peripheral point 2113 to the second outer peripheral point 2114, it can be observed that the projection of the second coil portion 213 is included in a region other than the projection of the first coil portion 211, that is, at least a part of the projection of the second coil portion 213 is located other than the projection of the first coil portion 211.
In the embodiment shown in fig. 3, the projection of the second coil portion 213 and the projection of the first coil portion 211 may not be connected to each other in the first direction from the first outer peripheral point 2113 to the second outer peripheral point 2114. That is, when the first coil portion 211 and the second coil portion 213 are observed in the first direction from the first outer peripheral point 2113 to the second outer peripheral point 2114, the first coil portion 211 and the second coil portion 213 are observed to be offset from each other.
In the second direction from the third outer circumferential point 2123 to the fourth outer circumferential point 2124, the third coil portion 212 and the second coil portion 213 may not entirely overlap.
The first coil part 211 and the third coil part 212 may be disposed at intervals in a direction indicated by a surrounding axis of the first coil part 211 or the third coil part 212. The second coil part 213 may be located between the first coil part 211 and the third coil part 212 in a direction indicated by a surrounding axis of the first coil part 211 or the third coil part 212.
In the present embodiment, the spacing space of the first coil part 211 and the third coil part 212 may be a limited space interposed between the first coil part 211 and the third coil part 212. The size of the space between the first coil part 211 and the third coil part 212 may correspond to the outer diameter of the first coil part 211 or the third coil part 212, as seen in the circumferential axis direction of the first coil part 211 or the third coil part 212.
The surrounding axis 2130 of the second coil portion 213 may be different from the surrounding axis of either the first coil portion 211 or the third coil portion 212. In some embodiments, the circumferential axis 2130 of the second coil portion 213 may be perpendicular relative to the circumferential axis of the first coil portion 211 or the third coil portion 212. That is, any one turn of the wire of the second coil part 213 is disposed vertically with respect to any one turn of the wire of the first coil part 211 or the third coil part 212. Any one of the coil wires of the first coil portion 211 may be disposed in parallel with respect to any one of the coil wires of the third coil portion 212. In other words, the second coil part 213 may be disposed in parallel with respect to the surrounding axis of the first coil part 211 or the third coil part 212. The second coil part 213 may include a third connection end 2131 and a fourth connection end 2132, the third connection end 2131 and the fourth connection end 2132 being located at both sides of the second coil part 213. The third connection end 2131 may be provided adjacent to the first coil portion 211. The third connection end 2131 may be connected to an end of the first coil portion 211 adjacent to the third coil portion 212. The fourth connection end 2132 may be provided near the third coil portion 212. The fourth connection end 2132 may be connected to an end of the third coil portion 212 adjacent to the first coil portion 211.
In order that the first coil 210 and the second coil 310 may have a relatively high degree of coupling, the second coil portion 213 of the first coil 210 may be disposed close to the second coil 310 and opposite to the second coil 310. In one embodiment, as shown in fig. 5, the orthographic projection of the second coil portion 213 at the second coil 310 may correspond to a central region of the second coil 310. In some embodiments, the spacing of the second coil portion 213 from the second coil 310 may be less than the spacing of the first coil portion 211 (or the third coil portion 212) from the second coil 310.
The second coil part 213 and the second coil 310 may be coaxially wound. That is, the surrounding axis 2130 of the second coil portion 213 and the surrounding axis 3100 of the second coil 310 may be identical (including the same base). The second coil portion 213 may be made around a third surround axis 2130, the second coil 310 may be made around a fourth surround axis 3100, and the third surround axis 2130 and the fourth surround axis 3100 may be collinear; alternatively, the third and fourth axes 2130 and 3100 may be disposed in parallel, with a small or negligible spacing between the third and fourth axes 2130 and 3100 in a direction perpendicular to the third or fourth axes 2130 and 3100. Any turn of the wire of the second coil part 213 may be disposed in parallel with respect to any turn of the wire of the second coil 310.
In some embodiments, the second coil part 213 may include a plurality of loops connected in series, the plurality of loops being arranged along a circumferential axis of the second coil part 213. The plurality of loops may include a first loop 2131, a second loop 2132, and a third loop 2133, the second loop 2132 may be connected in series between the first loop 2131 and the third loop 2133, and the second loop 2132 may be located between the first loop 2131 and the third loop 2133. That is, the second coil part 213 may be spirally wound along a winding axis of the second coil part 213 in a direction away from the first coil part 211 and the third coil part 212.
As shown in fig. 3, in some embodiments, the first wireless charging module 200 may further include a cylindrical magnet 220. The columnar magnet 220 may be, for example, a hollow columnar housing. In the embodiment shown in fig. 3, the number of columnar magnets 220 may be one. The columnar magnet 220 may pass through the first coil part 211 and the third coil part 212. The first coil part 211 and the third coil part 212 may surround the outer circumference of the cylindrical magnet 220. The second coil part 213 may be located at one side of the columnar magnet 220. In other embodiments, the number of columnar magnets 220 may be multiple. For example, the first columnar magnet passes through the first coil part 211, and the first coil part 211 surrounds the outer circumference of the first columnar magnet; the second cylindrical magnet passes through the third coil part 212, and the third coil part 212 surrounds the outer circumference of the second cylindrical magnet. The columnar magnet 220 may act as a magnetic flux piece for the first coil portion 211 and/or the third coil portion 212.
In one embodiment, the columnar magnet 220 may have a shielding surface disposed opposite the second coil part 213, and the shielding surface may be located at a side of the columnar magnet 220 near the second coil part 213. The shielding surface may be provided in parallel with the second coil portion 213, for example.
As shown in fig. 3, in some embodiments, the second wireless charging module 300 may also include a flat magnet 320. The flat magnet 320 may be located at a side of the second coil 310 remote from the first coil 210. The flat magnet 320 may serve as a magnetic flux piece of the second coil part 213.
The principle of coupling of the first coil 210 and the second coil 310 is described below with reference to fig. 3, 7, and 8 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310.
The winding direction of the second coil part 213 may be opposite to or the same as the winding direction of the second coil 310. In the embodiment provided herein, the winding direction of the second coil part 213 may be opposite to the winding direction of the second coil 310. The winding direction of the second coil part 213 may be determined along the circumferential axis of the second coil part 213 (i.e., the winding direction from the third connection end 2131 of the second coil part 213 to the fourth connection end 2132 of the second coil part 213) according to the direction from the first coil part 211 to the second coil part 213. The winding direction of the second coil 310 may be determined according to the outside-in direction.
In the embodiment shown in fig. 3, the second coil part 213 is spirally wound around the winding axis 2130 (shown in fig. 4) of the second coil part 213 from the end of the second coil part 213 near the first coil part 211 in the counterclockwise direction to the end of the second coil part 213 near the third coil part 212, and thus the winding direction of the second coil part 213 may be the counterclockwise direction. The second coil 310 surrounds the shaft 3100 (shown in fig. 4) around the second coil 310 from outside to inside in a clockwise direction, so the winding direction of the second coil 310 may be a clockwise direction. In another embodiment, the winding direction of the second coil part 213 may be a clockwise direction, and the winding direction of the second coil 310 may be a counterclockwise direction.
Taking the embodiment shown in fig. 3 as an example, the first coil 210 may be a receiving coil and the second coil 310 may be a transmitting coil. When the direction of the current in the second coil 310 is clockwise, as shown in fig. 8, the magnetic field generated from the second coil 310 may pass through the second coil 310 and the second coil portion 213. The magnetic field emitted by the second coil 310 may diverge in a direction away from the second coil portion 213, pass through the second coil portion 213 from a side of the second coil portion 213 away from the second coil 310, and wind back to the second coil 310.
The second coil part 213 may induce a magnetic field emitted from the second coil 310, forming a counterclockwise current. Since the winding direction of the second coil part 213 is counterclockwise, the current of the first coil 210 can flow from the first coil part 211 to the third coil part 212 through the second coil part 213, as shown in fig. 7.
As shown in fig. 8, the magnetic field from the second coil 310 may pass through the second coil part 213 after passing through the first coil part 211, and be wound back to the second coil 310 to form a first magnetic field loop. The magnetic field from the second coil 310 may also pass through the second coil part 213 after passing through the third coil part 212 and be wound back to the second coil 310 to form a second magnetic field loop.
In order that the current generated by the first coil part 211 and the current generated by the second coil part 213 may be superimposed on each other instead of being offset from each other, the current direction generated by the first coil part 211 and the current direction generated by the second coil part 213 may be in the same phase at the junction between the first coil part 211 and the second coil part 213, that is, the current direction of the first coil part 211 and the current direction of the second coil part 213 may be continuous at both sides of the junction of the first coil part 211 and the second coil part 213.
In the embodiment shown in fig. 3 to 8, the winding direction of the second coil part 213 may be the same as the winding direction of the first coil part 211. The winding direction of the first coil part 211 may be along the circumferential axis of the first coil part 211, and may be determined according to the direction from the first coil part 211 to the second coil part 213. In connection with the embodiment shown in fig. 3, the first coil part 211 is spirally wound around the winding shaft 2120 (shown in fig. 4) of the first coil part 211 from the end of the first coil part 211 remote from the second coil part 213 in the counterclockwise direction to the end of the first coil part 211 near the second coil part 213, and thus the winding direction of the first coil part 211 may be the counterclockwise direction. Since the magnetic field diverges from the first coil portion 211 to the second coil portion 213, it is possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
In some embodiments, the first coil 210 may include a plurality of first coil portions 211. The plurality of first coil portions 211 may be located on the same side of the second coil portion 213 in a direction indicated by a surrounding shaft 2110 (shown in fig. 4) of the first coil portion 211. The plurality of first coil portions 211 may be connected in series or in parallel or in series-parallel (i.e., there is both a series and parallel electrical connection) with the second coil portion 213.
Since the first coil part 211 and the third coil part 212 are located at both sides of the second coil part 213 in the direction indicated by the surrounding axis of the first coil part 211 or the third coil part 212, the magnetic field passing through the first coil part 211 may be opposite in direction to the magnetic field passing through the third coil part 212. In order that current may flow from the first coil portion 211 to the third coil portion 212, the winding direction of the first coil portion 211 may be opposite to the winding direction of the third coil portion 212.
In order that the current generated by the third coil part 212 and the current generated by the second coil part 213 may be superimposed on each other instead of being offset from each other, the direction of the current generated by the third coil part 212 and the direction of the current generated by the second coil part 213 may be in the same phase at the junction between the third coil part 212 and the second coil part 213, that is, the direction of the current of the third coil part 212 and the direction of the current of the second coil part 213 may be continuous at both sides of the junction of the third coil part 212 and the second coil part 213.
In the embodiment shown in fig. 3 to 8, the winding direction of the second coil part 213 may be opposite to the winding direction of the third coil part 212. The winding direction of the third coil part 212 may be along the winding axis of the third coil part 212, which is determined according to the direction from the second coil part 213 to the third coil part 212. In connection with the embodiment shown in fig. 3, the third coil part 212 is wound around the winding shaft 2120 (shown in fig. 4) of the third coil part 212 from one end of the third coil part 212 near the second coil part 213, spirally wound to one end of the third coil part 212 far from the second coil part 213 in a clockwise direction, and thus the winding direction of the third coil part 212 may be a clockwise direction. Since the magnetic field diverges from the third coil part 212 to the second coil part 213, it is possible to realize a flow of current from the second coil part 213 to the third coil part 212.
In some embodiments, the first coil 210 may include a plurality of third coil portions 212. The plurality of third coil portions 212 may be located on the same side of the second coil portion 213 in a direction indicated by a surrounding shaft 2120 (shown in fig. 4) of the third coil portion 212. The assembly of the plurality of first coil portions 211 may be located on both sides of the second coil portion 213 with the assembly of the plurality of third coil portions 212 in a direction indicated by the surrounding shaft 2120 (shown in fig. 4) of the third coil portion 212. The plurality of third coil portions 212 may be connected in series or in parallel or in series and then connected in series with the second coil portion 213, for example.
The first coil portion 211 has a first voltage from the first connection terminal 2111 to the second connection terminal 2112 (i.e., a voltage between the first connection terminal 2111 and the second connection terminal 2112). The second coil portion 213 is set to a second voltage from the third connection terminal 2131 to the fourth connection terminal 2132 (i.e., the voltage between the third connection terminal 2131 and the fourth connection terminal 2132). The coil has a third voltage from the first connection 2111 to the fourth connection 2132 (i.e., the voltage between the first connection 2111 and the fourth connection 2132). The absolute value of the third voltage is equal to the sum of the absolute value of the first voltage and the absolute value of the second voltage.
The third coil portion 212 is set to a fourth voltage from the fifth connection 2121 to the sixth connection 2122 (i.e., the voltage between the fifth connection 2121 and the sixth connection 2122). The voltage of the coil from the first connection 2111 to the sixth connection 2122 (i.e., the voltage between the first connection 2111 and the sixth connection 2122) is the fifth voltage. The absolute value of the fifth voltage is equal to the sum of the absolute value of the first voltage, the absolute value of the second voltage, and the absolute value of the fourth voltage. The coil has a sixth voltage from the third connection 2131 to the sixth connection 2122 (i.e., the voltage between the third connection 2131 and the sixth connection 2122). The absolute value of the sixth voltage is equal to the sum of the absolute value of the second voltage and the absolute value of the fourth voltage.
The absolute value of the actually measured fifth voltage may not be exactly equal to the sum of the absolute value of the first voltage, the absolute value of the second voltage, and the absolute value of the fourth voltage due to a detection error or the like; the absolute value of the actually measured third voltage may not be exactly equal to the sum of the absolute value of the first voltage and the absolute value of the second voltage; the absolute value of the actually measured sixth voltage may not be exactly equal to the sum of the absolute value of the second voltage and the absolute value of the fourth voltage. Accordingly, reference herein to "equal to" may include "about equal to", "approximately equal to" and the like, as long as the error is small so that the above equation relationship may be approximately considered to be satisfied. In addition, in the present application, the voltage value generated by the wire between the second connection terminal 2112 and the third connection terminal 2131 is negligible; in this application, the voltage value generated by the wire between the fourth connection 2132 and the fifth connection 2121 is negligible.
In the embodiment provided herein, the second coil part 213 may have a specific position with respect to the first coil part 211 or the third coil part 212 in order that the first coil 210 may have superior magnetic field coupling performance. The second coil part 213 may be located at one side of the first coil part 211 or the third coil part 212 in a direction perpendicular to the circumferential axis of the first coil part 211 or the third coil part 212, which is advantageous to adapt the direction of the magnetic field generated by the second coil 220.
Fig. 9 shows coupling performance of the first coil 210 and the second coil 310 shown in fig. 3. Wherein the solid line may represent the coupling performance of the second coil part 213 and the second coil 310. The broken line may represent the coupling performance of the first coil part 211 and the second coil 310. The dash-dot line may represent the coupling performance of the third coil part 212 and the second coil 310. As can be seen from fig. 9, the first coil part 211 or the third coil part 212 may have relatively superior coupling performance with the second coil 310 in a region far from the central region of the second coil 310; the second coil part 213 and the second coil 310 may have relatively superior coupling performance in a region near the central region of the second coil 310. Accordingly, the first coil 210 and the second coil 310 may have relatively superior coupling performance over a relatively large range.
In the embodiment shown in fig. 3, the second coil part 213 may include a plurality of loop wires arranged in a stacked manner, i.e., a multi-turn wire stacked arrangement. Fig. 10 is another wireless charging system 100 provided in an embodiment of the present application. In the embodiment shown in fig. 10, the second coil part 213 may include a plurality of ring-shaped wires having different outer diameters, which are arranged in a coplanar manner. The second coil portion 213 shown in fig. 10 may be, for example, mosquito-repellent incense.
Fig. 11 is a schematic perspective view of another wireless charging system 100 according to an embodiment of the present application.
Similar to the embodiment shown in fig. 3, the wireless charging system 100 shown in fig. 11 may include a first coil 210, and the first coil 210 may include a first coil portion 211, a third coil portion 212, and a second coil portion 213. Unlike the embodiment shown in fig. 3, the wireless charging system 100 shown in fig. 11 includes a second coil 310 that is similar in structure to the first coil 210.
The second coil 310 may include a fourth coil portion 311, a fifth coil portion 312, and a sixth coil portion 313, and the sixth coil portion 313 may be connected in series between the fourth coil portion 311 and the fifth coil portion 312.
The fourth coil portion 311 may include a seventh connection end 3111 distal from the fifth coil portion 312 and an eighth connection end 3112 proximal to the fifth coil portion 312. The fifth coil part 312 may include a ninth connection end 3121 close to the fourth coil part 311 and a tenth connection end 3122 distant from the fourth coil part 311. The sixth coil portion 313 may include an eleventh connection end 3131 adjacent to the fourth coil portion 311 and a twelfth connection end 3132 adjacent to the fifth coil portion 312. The eighth connection end 3112 and the eleventh connection end 3131 may be connected. The ninth connection end 3121 and the twelfth connection end 3132 may be connected. That is, one end of the fourth coil portion 311 near the sixth coil portion 313 is connected to one end of the sixth coil portion 313 near the fourth coil portion 311, and one end of the fifth coil portion 312 near the sixth coil portion 313 is connected to one end of the sixth coil portion 313 far from the fourth coil portion 311.
A third end (not shown in fig. 11) of the second coil 310 may be an end of the fourth coil portion 311 remote from the sixth coil portion 313. The fourth end 302 of the second coil 310 may be an end of the fifth coil portion 312 remote from the sixth coil portion 313.
The fourth coil part 311 may have two opposite outer circumferential points, such as a fifth outer circumferential point 3113 and a sixth outer circumferential point 3114, in a cross section perpendicular to the circumferential axis of the fourth coil part 311. The connection line of the fifth outer circumferential point 3113 and the sixth outer circumferential point 3114 may intersect the circumferential axis of the fourth coil portion 311. The line connecting the fifth outer circumferential point 3113 and the sixth outer circumferential point 3114 may also be perpendicular with respect to the circumferential axis of the fourth coil portion 311.
The fifth coil part 312 may have two opposite outer peripheral points, such as a seventh outer peripheral point 3123 and an eighth outer peripheral point 3124, in a cross-section perpendicular to the circumferential axis of the fifth coil part 312. A line connecting the seventh outer peripheral point 3123 and the eighth outer peripheral point 3124 may intersect the surrounding axis of the fifth coil section 312. The line connecting the seventh outer peripheral point 3123 and the eighth outer peripheral point 3124 may also be perpendicular with respect to the circumferential axis of the fifth coil part 312.
The sixth coil part 313 may be disposed in parallel with respect to the circumferential axis of the fourth coil part 311 or the fifth coil part 312. Any one turn of the wire of the sixth coil part 313 may be perpendicular with respect to any one turn of the wire of the fourth coil part 311 or the fifth coil part 312. Any one turn of the wires of the fourth coil part 311 may be parallel with respect to any one turn of the wires of the fifth coil part 312. The distance from the sixth coil portion 313 to the fifth outer circumferential point 3113 may be greater than the distance from the sixth coil portion 313 to the sixth outer circumferential point 3114. The distance from the sixth coil portion 313 to the seventh outer peripheral point 3123 may be greater than the distance from the sixth coil portion 313 to the eighth outer peripheral point 3124. The fifth outer circumferential point 3113 may be opposite the seventh outer circumferential point 3123, and the sixth outer circumferential point 3114 may be opposite the eighth outer circumferential point 3124.
The fourth coil part 311, the fifth coil part 312, and the sixth coil part 313 may be arranged along a circumferential axis of the fourth coil part 311 or the fifth coil part 312. In the third direction from the fifth outer circumferential point 3113 to the sixth outer circumferential point 3114, the fourth coil portion 311 and the sixth coil portion 313 may not overlap entirely. In the fourth direction from the seventh outer peripheral point 3123 to the eighth outer peripheral point 3124, the fifth coil section 312 and the sixth coil section 313 may not entirely overlap.
The sixth coil part 313 may be located at one side of the fourth coil part 311 or the fifth coil part 312 in a direction perpendicular to the circumferential axis of the fourth coil part 311 or the fifth coil part 312. That is, the fourth coil part 311 and the fifth coil part 312 may be located on the same side of the sixth coil part 313, as viewed from a direction perpendicular to the third direction from the fifth outer circumferential point 3113 to the sixth outer circumferential point 3114, or as viewed from a direction perpendicular to the third direction from the seventh outer circumferential point 3123 to the eighth outer circumferential point 3124.
The fourth coil portion 311 may be referred to the first coil portion 211 of the embodiment shown in fig. 3, the fifth coil portion 312 may be referred to the third coil portion 212 of the embodiment shown in fig. 3, and the sixth coil portion 313 may be referred to the second coil portion 213 of the embodiment shown in fig. 3.
In order that the first coil 210 and the second coil 310 may have a relatively high degree of coupling, the fourth coil portion 311 of the second coil 310 may be disposed close to the first coil portion 211 of the first coil 210 and opposite to the first coil portion 211; the fifth coil portion 312 of the second coil 310 may be adjacent to the third coil portion 212 of the first coil 210 and disposed opposite to the third coil portion 212; the sixth coil portion 313 of the second coil 310 may be adjacent to the second coil portion 213 of the first coil 210 and disposed opposite to the second coil portion 213.
In some embodiments, the spacing of the second coil portion 213 from the sixth coil portion 313 may be less than the spacing of the first coil portion 211 from the fourth coil portion 311, and/or the spacing of the second coil portion 213 from the sixth coil portion 313 may be less than the spacing of the third coil portion 212 from the fifth coil portion 312.
In some embodiments, the circumferential axis of the fourth coil portion 311 may be disposed in parallel with respect to the circumferential axis of the first coil portion 211. The surrounding axis of the fifth coil part 312 may be disposed in parallel with respect to the surrounding axis of the third coil part 212. The surrounding axis of the fourth coil part 311 may be the same as that of the fifth coil part 312. The sixth coil portion 313 may be disposed in parallel with respect to the second coil portion 213. The surrounding axis 3130 of the sixth coil portion 313 may be the same as the surrounding axis 2130 of the sixth coil portion 313.
The principle of coupling of the first coil 210 and the second coil 310 is explained below with reference to fig. 11 to 13 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310. In the embodiment shown in fig. 12 to 13, the first coil 210 may be a receiving coil and the second coil 310 may be a transmitting coil.
The winding direction of the second coil part 213 may be opposite to the winding direction of the sixth coil part 313. The winding of the sixth coil portion 313 may be determined according to the direction from the fourth coil portion 311 to the fifth coil portion 312 (i.e., the direction from the eleventh connection end 3131 to the twelfth connection end 3132) along the circumferential axis of the sixth coil portion 313 from the first coil 210 to the second coil 220. In the embodiment shown in fig. 11, the winding direction of the second coil part 213 may be counterclockwise. The sixth coil part 313 is spirally wound in a clockwise direction from one end of the sixth coil part 313 near the fourth coil part 311 around a winding axis of the sixth coil part 313 to one end of the sixth coil part 313 near the fifth coil part 312, and thus a winding direction of the sixth coil part 313 may be a clockwise direction.
Taking the embodiment shown in fig. 12 as an example, in the case where the current direction in the sixth coil portion 313 is clockwise, as shown in fig. 13, the magnetic field emitted from the sixth coil portion 313 may penetrate the sixth coil portion 313 and diverge in a direction away from the second coil portion 213. The magnetic field emitted from the sixth coil portion 313 may also pass through the second coil portion 213 from a side of the second coil portion 213 remote from the sixth coil portion 313 and be wound back to the sixth coil portion 313. It is thus possible to realize a flow of current from the first coil portion 211 to the third coil portion 212.
In order that the current generated by the sixth coil part 313 and the current generated by the fourth coil part 311 may be superimposed on each other rather than offset from each other, the direction of the current generated by the sixth coil part 313 and the direction of the current generated by the fourth coil part 311 may be in the same phase at the junction between the sixth coil part 313 and the fourth coil part 311, that is, the direction of the current of the sixth coil part 313 and the direction of the current of the fourth coil part 311 may be continuous on both sides of the junction of the sixth coil part 313 and the fourth coil part 311.
In the embodiment shown in fig. 12, for example, the winding direction of the fourth coil part 311 may be opposite to the winding direction of the sixth coil part 313, and the winding direction of the fourth coil part 311 may be the same as the winding direction of the first coil part 211. The winding direction of the fourth coil part 311 may be determined according to the direction from the fourth coil part 311 to the sixth coil part 313 (i.e., the direction from the seventh connection end 3111 to the eighth connection end 3112) along the winding axis of the fourth coil part 311, from the fourth coil part 311 to the sixth coil part 313. In connection with the embodiment shown in fig. 11, the fourth coil part 311 is spirally wound around the winding axis of the fourth coil part 311 in a counterclockwise direction from one end of the fourth coil part 311 away from the sixth coil part 313 to one end of the fourth coil part 311 near the sixth coil part 313, and thus the winding direction of the fourth coil part 311 may be a counterclockwise direction.
Taking the embodiment shown in fig. 12 as an example, in the case where the current direction on the fourth coil portion 311 is counterclockwise, as shown in fig. 13, the magnetic field emitted from the fourth coil portion 311 may penetrate the fourth coil portion 311 and diverge in a direction away from the sixth coil portion 313. The magnetic field emitted from the fourth coil part 311 may also pass through the first coil part 211 from a side of the first coil part 211 remote from the second coil part 213 and be wound back to the fourth coil part 311. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
In order that the current generated by the sixth coil portion 313 and the current generated by the fifth coil portion 312 may be superimposed on each other, not offset from each other, the direction of the current generated by the sixth coil portion 313 and the direction of the current generated by the fifth coil portion 312 may be in the same phase at the junction between the sixth coil portion 313 and the fifth coil portion 312, that is, the direction of the current of the sixth coil portion 313 and the direction of the current of the fifth coil portion 312 may be continuous at both sides of the junction of the sixth coil portion 313 and the fifth coil portion 312.
In the embodiment shown in fig. 12, for example, the winding direction of the fifth coil part 312 may be the same as the winding direction of the sixth coil part 313, and the winding direction of the fifth coil part 312 may be the same as the winding direction of the third coil part 212. That is, the winding direction of the fifth coil part 312 may be opposite to the winding direction of the fourth coil part 311. The winding direction of the fifth coil part 312 may be determined according to the direction from the sixth coil part 313 to the fifth coil part 312 (i.e., the direction from the ninth connection end 3121 to the tenth connection end 3122) along the circumferential axis of the fifth coil part 312. In connection with the embodiment shown in fig. 11, the fifth coil part 312 is spirally wound from one end of the fifth coil part 312 near the sixth coil part 313 in a clockwise direction around the winding axis of the fifth coil part 312 to one end of the fifth coil part 312 far from the sixth coil part 313, and thus the winding direction of the fifth coil part 312 may be a clockwise direction.
Taking the embodiment shown in fig. 12 as an example, in the case where the current direction in the fifth coil part 312 is clockwise, as shown in fig. 13, the magnetic field emitted from the fifth coil part 312 may penetrate the fifth coil part 312 and diverge in a direction away from the sixth coil part 313. The magnetic field emitted from the fifth coil part 312 may also pass through the third coil part 212 from a side of the third coil part 212 remote from the second coil part 213 and be wound back to the fifth coil part 312. It is thus possible to realize a flow of current from the second coil portion 213 to the third coil portion 212. The magnetic field passing through the fourth coil part 311 may be opposite in direction to the magnetic field passing through the fifth coil part 312.
By superimposing the magnetic field formed by the fourth coil portion 311 and the sixth coil portion 313, the magnetic field generated by the second coil 310 can pass through the sixth coil portion 313 from the side of the sixth coil portion 313 away from the second coil portion 213, pass through the fourth coil portion 311 from the side of the fourth coil portion 311 close to the sixth coil portion 313, pass through the first coil portion 211 from the side of the first coil portion 211 away from the second coil portion 213, pass through the second coil portion 213 from the side of the second coil portion 213 away from the sixth coil portion 313, and be wound back to the sixth coil portion 313.
By superimposing the magnetic field formed by the fifth coil portion 312 and the sixth coil portion 313, the magnetic field generated by the second coil 310 can pass through the sixth coil portion 313 from the side of the sixth coil portion 313 away from the second coil portion 213, pass through the fifth coil portion 312 from the side of the fifth coil portion 312 close to the sixth coil portion 313, pass through the third coil portion 212 from the side of the third coil portion 212 away from the second coil portion 213, pass through the second coil portion 213 from the side of the second coil portion 213 away from the sixth coil portion 313, and wind back to the sixth coil portion 313.
Fig. 14 is a schematic perspective view of still another wireless charging system 100 according to an embodiment of the present application.
Similar to the embodiment shown in fig. 3, the wireless charging system 100 shown in fig. 14 may include a first coil 210, and the first coil 210 may include a first coil portion 211, a third coil portion 212, and a second coil portion 213. Unlike the embodiment shown in fig. 3, the second coil 310 in the wireless charging system 100 shown in fig. 14 may be a cylindrical coil.
The second coil 310 may include a fourth coil part 311 and a fifth coil part 312, and the fourth coil part 311 and the fifth coil part 312 may be electrically connected by a wire. The fourth coil portion 311 may include a seventh connection end 3111 distal from the fifth coil portion 312 and an eighth connection end 3112 proximal to the fifth coil portion 312. The fifth coil part 312 may include a ninth connection end 3121 close to the fourth coil part 311 and a tenth connection end 3122 distant from the fourth coil part 311. The eighth connection end 3112 and the ninth connection end 3121 may be connected. A third end (not shown in fig. 14) of the second coil 310 may be an end of the fourth coil portion 311 remote from the fifth coil portion 312. The fourth end 302 of the second coil 310 may be an end of the fifth coil portion 312 remote from the fourth coil portion 311.
The structure of the fourth coil part 311 may be referred to the first coil part 211 of the embodiment shown in fig. 3 or 11, and the structure of the fifth coil part 312 may be referred to the third coil part 212 of the embodiment shown in fig. 3 or 11.
In order that the first coil 210 and the second coil 310 may have a relatively high degree of coupling, the fourth coil portion 311 of the second coil 310 may be disposed close to the first coil portion 211 of the first coil 210 and opposite to the first coil portion 211; the fifth coil portion 312 of the second coil 310 may be adjacent to the third coil portion 212 of the first coil 210 and disposed opposite to the third coil portion 212. The fourth coil part 311 and the fifth coil part 312 may be located at a side of the first coil 210 near the first flat coil 213. Along the circumferential axis of the fourth coil part 311 or the fifth coil part 312, the fourth coil part 311 and the fifth coil part 312 may be located at both sides of the first flat coil 213.
The principle of coupling of the first coil 210 and the second coil 310 is explained below with reference to fig. 14 to 16 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310. In the embodiment shown in fig. 15 to 16, the first coil 210 may be a receiving coil and the second coil 310 may be a transmitting coil.
The winding direction of the fourth coil portion 311 may be the same as the winding direction of the first coil portion 211. The winding direction of the fourth coil portion 311 may be determined according to the directions from the fourth coil portion 311 to the fifth coil portion 312. In connection with the embodiment shown in fig. 14, the fourth coil part 311 is spirally wound around the winding axis of the fourth coil part 311 in the counterclockwise direction from the end of the fourth coil part 311 away from the fifth coil part 312 to the end of the fourth coil part 311 near the fifth coil part 312, and thus the winding direction of the fourth coil part 311 may be the counterclockwise direction.
Taking the embodiment shown in fig. 15 as an example, in the case where the current direction on the fourth coil portion 311 is counterclockwise, as shown in fig. 16, the magnetic field emitted from the fourth coil portion 311 may penetrate the fourth coil portion 311 and diverge in a direction away from the fifth coil portion 312. The magnetic field emitted from the fourth coil part 311 may also pass through the first coil part 211 from a side of the first coil part 211 remote from the second coil part 213 and be wound back to the fourth coil part 311. In one possible case, the magnetic field emitted from the fourth coil part 311 may also penetrate the second coil part 213 from the side of the second coil part 213 remote from the second coil 310 and be wound back to the fourth coil part 311. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
The winding direction of the fifth coil part 312 may be the same as the winding direction of the third coil part 212. The winding direction of the fifth coil part 312 may be opposite to the winding direction of the fourth coil part 311. The winding direction of the fifth coil part 312 may be determined according to the directions from the fourth coil part 311 to the fifth coil part 312. In connection with the embodiment shown in fig. 14, the fifth coil part 312 is spirally wound in a clockwise direction from one end of the fifth coil part 312 near the fourth coil part 311 around the winding axis of the fifth coil part 312 to one end of the fifth coil part 312 far from the fourth coil part 311, and thus the winding direction of the fifth coil part 312 may be the clockwise direction.
Taking the embodiment shown in fig. 15 as an example, in the case where the current direction on the fifth coil part 312 is clockwise, as shown in fig. 16, the magnetic field emitted from the fifth coil part 312 may penetrate the fifth coil part 312 and diverge in a direction away from the fourth coil part 311. The magnetic field emitted from the fifth coil part 312 may also pass through the third coil part 212 from a side of the third coil part 212 remote from the second coil part 213 and be wound back to the fifth coil part 312. In one possible case, the magnetic field emitted from the fifth coil part 312 may also penetrate the second coil part 213 from a side of the second coil part 213 remote from the second coil 310 and be wound back to the fifth coil part 312. It is thus possible to realize a flow of current from the second coil portion 213 to the third coil portion 212. The magnetic field passing through the fourth coil part 311 may be opposite in direction to the magnetic field passing through the fifth coil part 312.
In the embodiment shown in fig. 14 to 16, the fourth coil portion 311 and the fifth coil portion 312 may be electrically connected by series connection. In other possible embodiments, the fourth coil part 311 and the fifth coil part 312 may be electrically connected by parallel connection. In one possible embodiment, the second coil 310 may include only one cylindrical coil (the fourth coil part 311 or the fifth coil part 312 as shown in fig. 14 to 16), and may further include a plurality of cylindrical coils, which may be electrically connected in series, parallel, or a series-parallel hybrid manner.
As can be seen from the embodiments shown in fig. 3 to 16, the coil provided in the present application can be applied to a wireless charging system with a flat coil, and also can be applied to a wireless charging system with a cylindrical coil, so that the application is wide. The coil provided herein may have a relatively small footprint compared to the flat coil shown in fig. 3. In combination with the schematic diagram of the coupling coefficients shown in fig. 9, the coil provided by the present application may be advantageous for achieving relatively superior wireless charging performance.
Fig. 17 is an electronic device 400 provided in an embodiment of the present application. In the embodiment shown in fig. 17, the electronic device 400 may be smart glasses. In other embodiments, electronic device 400 may be other types of electronic devices with wireless charging capabilities. The electronic device 400 shown in fig. 17 may be, for example, the wireless charging receiving device 110 or the wireless charging transmitting device 120 shown in fig. 1. The electronic device 400 may include a frame 123, a temple 124, and a lens 125. The temples may be provided with the first coil 210 shown in fig. 3 to 13.
In the embodiment shown in fig. 17, a circuit board assembly 410 may also be provided on the temple 124. The circuit board assembly 410 may be assembled with the first coil 210. In some embodiments, the circuit board assembly 410 and the first coil 210 may be part of the wireless charging module 200 shown in fig. 3. The circuit board assembly 410 may be disposed with the first coil 210 at an end of the temple 124 proximate to the frame 123. As shown in the partial enlarged view in fig. 17, the circuit board assembly 410 may be located between the first coil part 211 and the third coil part 212. The surrounding axis of the first coil part 211 or the third coil part 212 may pass through the circuit board assembly 410, for example. The circuit board assembly 410 may be disposed opposite to the second coil part 213. The side of the circuit board assembly 410 near the second coil part 213 may be provided with, for example, a magnetic shield that may serve as a magnetic flux piece of the second coil part 213.
The circuit board assembly 410 may include a first signal port and a second signal port (not shown in fig. 17). The first signal port may be electrically connected with a first end of the first coil 210, and the second signal port may be electrically connected with a second end of the first coil 210. Thus, the induced current generated by the first coil 210 may be transmitted to the circuit board assembly 410.
The temple 124 may also be provided with a battery 420, and the battery 420 may be located at an end of the temple 124 remote from the frame 123. The circuit board assembly 410 may be electrically connected between the battery 420 and the first coil 210 such that the first coil 210 may charge the battery 420 through the circuit board assembly 410.
Fig. 18 is a wireless charging system 100 according to an embodiment of the present application. The wireless charging system 100 shown in fig. 18 may include a first coil 210 and a second coil 310. Similar to the wireless charging system 100 shown in fig. 3, the first coil 210 shown in fig. 18 may include a first coil portion 211 and a second coil portion 213; the second coil 310 may be a flat coil; the second coil portion 213 of the first coil 210 may be adjacent to the second coil 310 and disposed opposite to the second coil 310. In some embodiments, the spacing of the second coil portion 213 from the second coil 310 may be less than the spacing of the first coil portion 211 from the second coil 310. Unlike the wireless charging system 100 shown in fig. 3, the first coil 210 may not include the third coil part 212 shown in fig. 3.
In the embodiment shown in fig. 18, the first end 201 of the first coil 210 may be an end of the first coil portion 211 remote from the second coil portion 213. The second end 202 of the first coil 210 may be an end of the second coil portion 213 remote from the first coil portion 211. The second coil portion 213 may be disposed in parallel with respect to a surrounding shaft 2110 (shown in fig. 4) of the first coil portion 211. That is, the circumferential axis 2130 (shown in fig. 4) of the second coil portion 213 may be disposed perpendicularly with respect to the circumferential axis 2110 of the first coil portion 211. The second coil part 213 may be located at one side of the first coil part 211 in a direction perpendicular to the surrounding shaft 2110 of the first coil part 211.
The principle of coupling of the first coil 210 and the second coil 310 is explained below with reference to fig. 18 to 20 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310. In the embodiment shown in fig. 19 and 20, the first coil 210 may be a receiving coil, and the second coil 310 may be a transmitting coil.
The winding direction of the second coil part 213 may be opposite to the winding direction of the second coil 310. In the embodiment shown in fig. 18, the winding direction of the second coil part 213 may be counterclockwise. The winding direction of the second coil 310 is clockwise. In the case where the direction of the current in the second coil 310 is clockwise, as shown in fig. 19 and 20, the magnetic field generated from the second coil 310 may penetrate the second coil 310 and diverge in a direction away from the second coil portion 213. The magnetic field emitted from the second coil 310 may also pass through the second coil portion 213 from a side of the second coil portion 213 remote from the second coil 310 and be wound back to the second coil 310. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
The winding direction of the second coil part 213 may be the same as the winding direction of the first coil part 211. In the embodiment shown in fig. 18, the winding direction of the first coil portion 211 may be counterclockwise. In the case where the direction of the current on the second coil 310 is clockwise, as shown in fig. 19, 20, the magnetic field from the second coil 310 may pass through the second coil portion 213 after passing through the first coil portion 211, and be wound back to the second coil 310. Since the magnetic field diverges from the first coil portion 211 to the second coil portion 213, it is possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
The first coil portion 211 has a first voltage from the first connection terminal 2111 to the second connection terminal 2112 (i.e., a voltage between the first connection terminal 2111 and the second connection terminal 2112). The second coil portion 213 is set to a second voltage from the third connection terminal 2131 to the fourth connection terminal 2132 (i.e., the voltage between the third connection terminal 2131 and the fourth connection terminal 2132). The voltage of the coils from the first connection terminal 2111 to the fourth connection terminal 2132 (i.e., the voltage between the first connection terminal 2111 and the fourth connection terminal 2132) is a third voltage, and the absolute value of the third voltage is equal to the sum of the absolute value of the first voltage and the absolute value of the second voltage.
The absolute value of the actually measured third voltage may not be exactly equal to the sum of the absolute value of the first voltage and the absolute value of the second voltage due to a detection error or the like. Accordingly, reference herein to "equal to" may include "about equal to", "approximately equal to" and the like, as long as the error is small so that the above equation relationship may be approximately considered to be satisfied. In addition, in the present application, the voltage value generated by the wire between the second connection terminal 2112 and the third connection terminal 2131 is negligible.
Fig. 21 is another wireless charging system 100 provided in an embodiment of the present application. The wireless charging system 100 shown in fig. 21 may include a first coil 210 and a second coil 310. Similar to the wireless charging system 100 shown in fig. 11, the first coil 210 shown in fig. 21 may include a first coil part 211 and a second coil part 213; the second coil 310 may include a fourth coil part 311 and a sixth coil part 313; the second coil portion 213 of the first coil 210 may be adjacent to the sixth coil portion 313 of the second coil 310 and disposed opposite to the sixth coil portion 313; the first coil portion 211 of the first coil 210 may be adjacent to the fourth coil portion 311 of the second coil 310 and disposed opposite to the fourth coil portion 311. In some embodiments, the spacing of the second coil portion 213 from the sixth coil portion 313 may be less than the spacing of the first coil portion 211 from the fourth coil portion 311.
Unlike the wireless charging system 100 shown in fig. 11, the first coil 210 shown in fig. 21 may not include the third coil part 212 shown in fig. 11, and the second coil 310 shown in fig. 21 may not include the fifth coil part 312 shown in fig. 11. In the embodiment shown in fig. 21, the structure of the first coil 210 may refer to the embodiment shown in fig. 18.
In the embodiment shown in fig. 21, the third end (not shown in fig. 21) of the second coil 310 may be an end of the fourth coil portion 311 remote from the sixth coil portion 313. A fourth end (not shown in fig. 21) of the second coil 310 may be an end of the sixth coil portion 313 remote from the fourth coil portion 311. The sixth coil portion 313 may be disposed in parallel with respect to the circumferential axis of the fourth coil portion 311. The sixth coil part 313 may be located at one side of the fourth coil part 311 in a direction perpendicular to the circumferential axis of the fourth coil part 311.
The principle of coupling of the first coil 210 and the second coil 310 is explained below with reference to fig. 21 to 23 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310. In the embodiment shown in fig. 22 and 23, the first coil 210 may be a receiving coil, and the second coil 310 may be a transmitting coil.
The winding direction of the second coil part 213 may be opposite to the winding direction of the sixth coil part 313. In the embodiment shown in fig. 21, the winding direction of the second coil part 213 may be counterclockwise. The winding direction of the sixth coil portion 313 is clockwise. In the case where the current direction in the sixth coil portion 313 is clockwise, as shown in fig. 22 and 23, the magnetic field emitted from the sixth coil portion 313 may penetrate the sixth coil portion 313 and diverge in a direction away from the second coil portion 213. The magnetic field emitted from the sixth coil portion 313 may also pass through the second coil portion 213 from a side of the second coil portion 213 remote from the sixth coil portion 313 and be wound back to the sixth coil portion 313. It is thus possible to realize a flow of current from the first coil portion 211 to the third coil portion 212.
The winding direction of the fourth coil portion 311 may be opposite to the winding direction of the sixth coil portion 313, and the winding direction of the fourth coil portion 311 may be the same as the winding direction of the first coil portion 211. In the embodiment shown in fig. 21, the winding direction of the fourth coil part 311 may be a counterclockwise direction. In the case where the current direction in the fourth coil portion 311 is counterclockwise, as shown in fig. 22 and 23, the magnetic field emitted from the fourth coil portion 311 may penetrate the fourth coil portion 311 and diverge in a direction away from the sixth coil portion 313. The magnetic field emitted from the fourth coil part 311 may also pass through the first coil part 211 from a side of the first coil part 211 remote from the second coil part 213 and be wound back to the fourth coil part 311. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
By superimposing the magnetic field formed by the fourth coil portion 311 and the sixth coil portion 313, the magnetic field generated by the second coil 310 can pass through the sixth coil portion 313 from the side of the sixth coil portion 313 away from the second coil portion 213, pass through the fourth coil portion 311 from the side of the fourth coil portion 311 close to the sixth coil portion 313, pass through the first coil portion 211 from the side of the first coil portion 211 away from the second coil portion 213, pass through the second coil portion 213 from the side of the second coil portion 213 away from the sixth coil portion 313, and be wound back to the sixth coil portion 313.
In another possible embodiment, the first coil 210 shown in fig. 18 may be replaced with the first coil 210 shown in fig. 11.
Fig. 24 is a schematic diagram of yet another wireless charging system 100 according to an embodiment of the present application. The wireless charging system 100 shown in fig. 24 may include a first coil 210 and a second coil 310. Similar to the wireless charging system 100 shown in fig. 14, the first coil 210 shown in fig. 14 may include a first coil part 211 and a second coil part 213; the second coil 310 may include a fourth coil part 311 and a fifth coil part 312; the first coil portion 211 of the first coil 210 may be adjacent to the fourth coil portion 311 of the second coil 310 and disposed opposite to the fourth coil portion 311; the fourth coil part 311 and the fifth coil part 312 may be located at a side of the first coil 210 near the first flat coil 213; along the circumferential axis of the fourth coil part 311 or the fifth coil part 312, the fourth coil part 311 and the fifth coil part 312 may be located at both sides of the first flat coil 213.
Unlike the wireless charging system 100 shown in fig. 14, the first coil 210 shown in fig. 24 may not include the third coil portion 212 shown in fig. 11. In the embodiment shown in fig. 24, the structure of the first coil 210 may refer to the embodiment shown in fig. 18. The structure of the second coil 310 may refer to the embodiment shown in fig. 14.
The principle of coupling of the first coil 210 and the second coil 310 is explained below with reference to fig. 24 to 26 by the winding direction, the current direction, and the magnetic field direction of the first coil 210 and the second coil 310. In the embodiment shown in fig. 25 and 26, the first coil 210 may be a receiving coil, and the second coil 310 may be a transmitting coil.
The winding direction of the fourth coil portion 311 may be the same as the winding direction of the first coil portion 211. In connection with the embodiment shown in fig. 14, the winding direction of the fourth coil part 311 may be counterclockwise. The magnetic field emitted from the fourth coil part 311 may penetrate the fourth coil part 311 and diverge in a direction away from the fifth coil part 312. The magnetic field emitted from the fourth coil part 311 may also pass through the first coil part 211 from a side of the first coil part 211 remote from the second coil part 213 and be wound back to the fourth coil part 311. In one possible case, the magnetic field emitted from the fourth coil part 311 may also penetrate the second coil part 213 from the side of the second coil part 213 remote from the second coil 310 and be wound back to the fourth coil part 311. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213.
The winding direction of the fifth coil part 312 may be opposite to the winding direction of the fourth coil part 311. In connection with the embodiment shown in fig. 14, the winding direction of the fifth coil part 312 may be a clockwise direction. The magnetic field emitted from the fifth coil part 312 may penetrate the fifth coil part 312 and diverge in a direction away from the fourth coil part 311. The magnetic field emitted from the fifth coil part 312 may also pass through the second coil part 213 from a side of the second coil part 213 remote from the second coil 310 and be wound back to the fifth coil part 312. It is thus possible to realize a flow of current from the first coil portion 211 to the second coil portion 213. The magnetic field passing through the fourth coil part 311 may be opposite in direction to the magnetic field passing through the fifth coil part 312.
In the embodiment shown in fig. 24 to 26, the fourth coil portion 311 and the fifth coil portion 312 may be electrically connected by series connection. In other possible embodiments, the fourth coil part 311 and the fifth coil part 312 may be electrically connected by parallel connection. In one possible embodiment, the second coil 310 may include only one cylindrical coil (the fourth coil part 311 or the fifth coil part 312 as shown in fig. 24 to 26), and may further include a plurality of cylindrical coils, which may be electrically connected in series, parallel, or a series-parallel hybrid manner.
As can be seen from the embodiments shown in fig. 18 to 26, the coil provided in the present application can be applied to a wireless charging system with a flat coil, and also can be applied to a wireless charging system with a cylindrical coil, so that the application is wide. The coil provided herein may have a relatively small footprint compared to the flat coil shown in fig. 3. In combination with the schematic diagram of the coupling coefficients shown in fig. 9, the coil provided by the present application may be advantageous for achieving relatively superior wireless charging performance. The coil 210 shown in fig. 18 to 26 may have a smaller occupied space than the coil 210 shown in fig. 3 to 16. The coil 210 shown in fig. 3 to 16 may have a relatively symmetrical magnetic coupling performance as compared to the coil 210 shown in fig. 18 to 26.
In summary, the coil provided by the application can give consideration to the advantages of the flat coil and the columnar coil, and is applicable to the scene with smaller coupling area. Compared with a pure columnar coil, the coil provided by the application is easier to realize a relatively high coupling coefficient; the coil provided herein may have a relatively smaller footprint than a purely flat coil.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (29)

1. A coil (210) comprising a first coil part (211), a second coil part (213), the surrounding axis of the first coil part (211) and the surrounding axis of the second coil part (213) being different, the first coil part (211) comprising a first connection end (2111) and a second connection end (2112), the second coil part (213) comprising a third connection end (2131) and a fourth connection end (2132), the second connection end (2112) and the third connection end (2131) being connected, the surrounding axis of the first coil part (211) being seen in the direction from the first coil part (211) to the second coil part (213), the winding direction of the first coil part (211) from the first connection end (2111) to the second connection end (2112) being a first winding direction, the surrounding axis of the second coil part (213) being seen in the direction from the first coil part (211) to the second connection end (213), and the winding direction from the second coil part (213) being seen in the second winding direction from the first coil part (213) to the second connection end (213) being seen in the same winding direction.
2. The coil (210) according to claim 1, wherein the circumferential axis of the first coil part (211) and the circumferential axis of the second coil part (213) are perpendicular to each other.
3. The coil (210) according to claim 1 or 2, wherein the second coil portion (213) does not completely overlap the first coil portion (211) as seen in a direction perpendicular to the circumferential axis of the first coil portion (211).
4. A coil (210) according to any one of claims 1 to 3, characterized in that the second coil part (213) does not completely overlap the first coil part (211) as seen along the circumferential axis of the first coil part (211).
5. The coil (210) according to any one of claims 1 to 4, wherein the coil (210) further comprises a third coil part (212), a surrounding axis of the third coil part (212) and a surrounding axis of the second coil part (213) being different, the third coil part (212) being located on a side of the second coil part (213) remote from the first coil part (211), the third coil part (212) comprising a fifth connection end (2121) and a sixth connection end (2122), the fifth connection end (2121) and a fourth connection end (2132) of the second coil part (213) being connected, along the surrounding axis of the third coil part (212), and a winding direction of the third coil part (212) from the fifth connection end (2121) to the sixth connection end (2122) being a third winding direction, the third winding direction being opposite to the first winding direction, as seen from the second coil part (213) to the third coil part (212).
6. The coil (210) according to claim 5, wherein the first coil portion (211) and the third coil portion (212) are located on the same side of the second coil portion (213).
7. The coil (210) according to claim 5 or 6, wherein a surrounding axis of the third coil portion (212) is arranged coaxially with a surrounding axis of the first coil portion (211).
8. A wireless charging module (200) comprising a coil (210) according to any one of claims 1 to 7.
9. The wireless charging module (200) of claim 8, wherein the first coil portion (211) is a cylindrical coil portion, the wireless charging module (200) further comprising a cylindrical magnet (220), the cylindrical magnet (220) passing through the first coil portion (211).
10. The wireless charging module (200) of claim 9, wherein the second coil portion (213) is located on one side of the cylindrical magnet (220).
11. An electronic device (400) comprising the coil (210) of any one of claims 8 to 10.
12. The electronic device (400) of claim 11, wherein the electronic device (400) further comprises a circuit board assembly (410), the circuit board assembly (410) being disposed opposite the second coil portion (213).
13. An electronic device (400) characterized by comprising a first coil, the first coil comprising a first coil part (211), a second coil part (213), a surrounding axis of the first coil part (211) and a surrounding axis of the second coil part (213) being different, the first coil part (211) comprising a first connection end (2111) and a second connection end (2112), the second coil part (213) comprising a third connection end (2131) and a fourth connection end (2132), the second connection end (2112) and the third connection end (2131) being connected, a voltage between the first connection end (2111) and the second connection end (2112) being a first voltage, a voltage between the third connection end (2131) and the fourth connection end (2132) being a second voltage, a voltage between the first connection end (2131) and the fourth connection end (2132) being a third voltage, an absolute sum of the absolute values of the first voltage and the absolute value of the third voltage being equal to the absolute sum of the absolute values of the first voltages.
14. The electronic device (400) of claim 13, wherein the coil (210) further comprises a third coil portion (212), a surrounding axis of the third coil portion (212) and a surrounding axis of the second coil portion (213) being different, the third coil portion (212) being located on a side of the second coil portion (213) remote from the first coil portion (211), the third coil portion (212) comprising a fifth connection (2121) and a sixth connection (2122), the fifth connection (2121) and a fourth connection (2132) of the second coil portion (213) being connected, a voltage between the fifth connection (2121) and the sixth connection (2122) being a fourth voltage, a voltage between the first connection (2111) and the sixth connection (2122) being a fifth voltage, an absolute value of the fifth voltage being equal to a sum of an absolute value of the first voltage, an absolute value of the second voltage, and an absolute value of the fourth voltage.
15. A wireless charging system (100), comprising:
a first coil (210), the first coil (210) being a coil (210) according to any one of claims 1 to 7;
-a second coil (310), the second coil (310) being configured to be magnetically coupled with the first coil (210).
16. The wireless charging system (100) of claim 15, wherein the second coil (310) is disposed proximate to the second coil portion (213) and opposite the second coil portion (213), a circumferential axis of the second coil (310) being in the same direction as a circumferential axis of the second coil portion (213).
17. The wireless charging system (100) of claim 16, wherein a spacing of the second coil portion (213) from the second coil (310) is less than a spacing of the first coil portion (211) from the second coil (310).
18. The wireless charging system (100) of claim 16 or 17, wherein a central region of the second coil (310) is disposed opposite the second coil portion (213).
19. The wireless charging system (100) according to any one of claims 16 to 18, wherein a surrounding axis of the second coil (310) is arranged coaxially with a surrounding axis of the second coil portion (213).
20. The wireless charging system (100) of any of claims 16-19, wherein the wireless charging system (100) further comprises a flat magnet (320), the flat magnet (320) being located on a side of the second coil (310) remote from the first coil (210).
21. The wireless charging system (100) of claim 15, wherein the second coil (310) includes a fourth coil portion (311), the fourth coil portion (311) being disposed opposite the first coil portion (211).
22. The wireless charging system (100) according to claim 21, wherein the fourth coil portion (311) comprises a seventh connection end (3111) and an eighth connection end (3112), the second coil (310) further comprises a fifth coil portion (312), a surrounding axis of the fifth coil portion (312) is the same as a surrounding axis of the fourth coil portion (311), the fifth coil portion (312) comprises a ninth connection end (3121) and a tenth connection end (3122), the eighth connection end (3112) and the ninth connection end (3121) are connected, a connection line between the eighth connection end (3112) and the ninth connection end (3121) is arranged opposite to the second coil portion (213), along a surrounding axis of the fourth coil portion (311), and a direction from the fourth coil portion (311) to the fifth coil portion (312) is a direction in which the fourth coil portion (311) is wound from the seventh connection end (3111) to the eighth connection end (3121), and a fifth direction (3112) is wound from the seventh connection end (3112) to the fifth connection end (3112), and a fifth direction (3112) is wound.
23. The wireless charging system (100) of claim 21, wherein the fourth coil portion (311) includes a seventh connection end (3111) and an eighth connection end (3112), the second coil (310) further includes a sixth coil portion (313), a surrounding axis of the sixth coil portion (313) being different from a surrounding axis of the fourth coil portion (311), the sixth coil portion (313) being disposed proximate to and opposite the second coil portion (213),
the sixth coil portion (313) includes an eleventh connection end (3131) and a twelfth connection end (3132), the eleventh connection end (3131) is connected to the eighth connection end (3112), along a winding axis of the fourth coil portion (311), and a winding direction of the fourth coil portion (311) from the seventh connection end (3111) to the eighth connection end (3112) is a fourth winding direction, along a winding axis of the sixth coil portion (313), and a winding direction of the sixth coil portion (313) from the eleventh connection end (3131) to the twelfth connection end (3132) is a sixth winding direction, as viewed from the fourth connection end (311) to the sixth coil portion (313), the sixth winding direction being the same as the fourth winding direction.
24. The wireless charging system (100) of claim 23, wherein a circumferential axis of the sixth coil portion (313) is perpendicular to a circumferential axis of the fourth coil portion (311).
25. The wireless charging system (100) of claim 24, wherein a circumferential axis of the sixth coil portion (313) is parallel to a circumferential axis of the second coil portion (213).
26. The wireless charging system (100) of any of claims 23-25, wherein a spacing of the second coil portion (213) from the sixth coil portion (313) is less than a spacing of the first coil portion (211) from the fourth coil portion (311).
27. The wireless charging system (100) according to any one of claims 23 to 26, wherein the second coil (310) further comprises a fifth coil portion (312), a surrounding axis of the fifth coil portion (312) being different from a surrounding axis of the sixth coil portion (313), the fifth coil portion (312) being located on a side of the sixth coil portion (313) remote from the fourth coil portion (311), the fifth coil portion (312) comprising a ninth connection end (3121) and a tenth connection end (3122), the twelfth connection end (3132) and the ninth connection end (3121) of the sixth coil portion (313) being connected, the fifth coil portion (312) being wound in a fifth direction opposite to the fifth winding direction as seen from the sixth coil portion (313) to the fifth coil portion (312), the fifth winding direction being the fifth winding direction from the ninth connection end (3121) to the tenth connection end (3122).
28. The wireless charging system (100) of any of claims 15-27, wherein the first coil portion (211) is a cylindrical coil portion, the wireless charging system (100) further comprising a cylindrical magnet (220), the cylindrical magnet (220) passing through the first coil portion (211).
29. A wireless charging system (100), comprising:
a first electronic device, the first electronic device being an electronic device (400) as claimed in claim 13 or 14;
-a second electronic device comprising the second coil (310), the second coil (310) being configured to be magnetically coupled with the first coil (210).
CN202111495495.6A 2021-12-08 2021-12-08 Coil, wireless charging module, electronic equipment and wireless charging system Pending CN116246864A (en)

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PCT/CN2022/135912 WO2023103870A1 (en) 2021-12-08 2022-12-01 Coil, wireless charging module, electronic device, and wireless charging system

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* Cited by examiner, † Cited by third party
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WO2017214015A1 (en) * 2016-06-05 2017-12-14 Sanjaya Maniktala Coil structures for alignment and inductive wireless power transfer
CA3046620A1 (en) * 2016-09-01 2018-03-08 Sanjaya Maniktala Segmented and longitudinal receiver coil arrangements for wireless power transfer
CN108878112B (en) * 2018-06-25 2020-06-02 苏州奥彼电源有限公司 Wireless charging coil
US11251656B2 (en) * 2019-04-03 2022-02-15 Apple Inc. Coils for wireless power systems
CN113555204A (en) * 2021-07-21 2021-10-26 昆山联滔电子有限公司 Wireless charging coil piece and wireless charging coil assembly

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