CN108847721B - Wireless charging device, wireless charging system and electronic equipment - Google Patents
Wireless charging device, wireless charging system and electronic equipment Download PDFInfo
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- CN108847721B CN108847721B CN201810663045.5A CN201810663045A CN108847721B CN 108847721 B CN108847721 B CN 108847721B CN 201810663045 A CN201810663045 A CN 201810663045A CN 108847721 B CN108847721 B CN 108847721B
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- 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
- H02J50/15—Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明提供一种无线充电器件、无线充电系统和电子设备，其中无线充电器件包括绝缘基板，所述基板设置有线圈和磁致伸缩元件；所述线圈具有螺线管结构，所述磁致伸缩元件设置于所述线圈所围成的空间内，所述磁致伸缩元件在接收到超声波的情况下，可沿所述线圈的轴向方向伸缩运动。本发明中，通过在无线充电器件中设置线圈和磁致伸缩元件，基于磁致伸缩效应和电磁感应原理，无线充电器件可将声能转化为电能，由于声能的传输距离较远，从而可以实现远距离的无线充电。
The present invention provides a wireless charging device, a wireless charging system and an electronic device, wherein the wireless charging device comprises an insulating substrate provided with a coil and a magnetostrictive element; the coil has a solenoid structure, and the magnetostrictive element The element is arranged in the space enclosed by the coil, and the magnetostrictive element can expand and contract along the axial direction of the coil under the condition of receiving ultrasonic waves. In the present invention, by arranging coils and magnetostrictive elements in the wireless charging device, based on the principle of magnetostrictive effect and electromagnetic induction, the wireless charging device can convert sound energy into electrical energy. Realize long-distance wireless charging.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging device, a wireless charging system and electronic equipment.
Background
As a new charging technology, the wireless charging technology is gradually applied to electric devices such as electric vehicles, mobile phones, and tablets. The traditional wireless charging technology is electromagnetic induction wireless charging technology, however, in the electromagnetic induction wireless charging technology, the receiving end of the device to be charged and the transmitting end of the wireless charging device need to be aligned to realize charging, the charging distance is short, and in the charging process, a user cannot use the device, and the flexibility of wireless charging is poor.
Therefore, the problem that the chargeable distance is short exists in the existing wireless charging technology.
Disclosure of Invention
The embodiment of the invention provides a wireless charging device, a wireless charging system and electronic equipment, and aims to solve the problem that the chargeable distance is short in the existing wireless charging technology.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a wireless charging device, including an insulating substrate, the substrate being provided with a coil and a magnetostrictive element;
the coil is provided with a solenoid structure, the magnetostrictive elements are arranged in a space surrounded by the coil, and the magnetostrictive elements can perform telescopic motion along the axial direction of the coil under the condition of receiving ultrasonic waves.
In a second aspect, an embodiment of the present invention provides a wireless charging system, including an ultrasonic generator and the above wireless charging device.
In a third aspect, an embodiment of the present invention provides an electronic device, including a power storage element and the above wireless charging device, wherein a coil of the wireless charging device is electrically connected to the power storage element.
In the embodiment of the invention, the coil and the magnetostrictive element are arranged in the wireless charging device, based on the magnetostrictive effect and the electromagnetic induction principle, the wireless charging device can convert the sound energy into the electric energy, and the long-distance wireless charging can be realized because the transmission distance of the sound energy is long.
Drawings
Fig. 1 is a schematic structural diagram of a wireless charging device according to an embodiment of the present invention;
fig. 2 is one of schematic structural diagrams of a coil of a wireless charging device provided by an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a coil of a wireless charging device according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a coil of a wireless charging device according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 7 is a cross-sectional view of the corresponding arrangement of fig. 5 provided with magnetostrictive elements;
fig. 8 is a cross-sectional view of the corresponding arrangement of fig. 6 provided with magnetostrictive elements.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a wireless charging device including an insulating substrate 1, the substrate 1 being provided with a coil 2 and a magnetostrictive element 3;
the coil 2 has a solenoid structure, the magnetostrictive element 3 is arranged in a space surrounded by the coil 2, and the magnetostrictive element 3 can perform telescopic motion along the axial direction of the coil 2 when receiving ultrasonic waves.
The wireless charging device of the embodiment of the invention realizes wireless charging by utilizing the magnetostrictive effect and the electromagnetic induction principle. The magnetostrictive effect means that the length of the magnetostrictive element 3 changes under the action of a magnetic field, and the magnetostrictive element can displace to do work, or the magnetostrictive element 3 can repeatedly expand and contract under the action of an alternating magnetic field, so that mechanical vibration or sound waves are generated. It can be seen that the magnetostrictive element 3 can convert electromagnetic energy into acoustic or mechanical energy (or acoustic or mechanical displacement information) using the magnetostrictive effect. Conversely, the magnetostrictive element 3 may also convert acoustic or mechanical energy into electromagnetic energy (or electromagnetic information).
In the embodiment of the present invention, the magnetostrictive element 3 is disposed in the coil 2, and when an acoustic wave is applied to the magnetostrictive element 3, the magnetostrictive element 3 performs a telescopic motion in a space surrounded by the coil 2, and when the magnetostrictive element 3 performs a telescopic motion in the axial direction of the coil 2, a magnetic flux passing through the coil 2 can be changed, thereby generating an induced potential. Therefore, the wireless charging device provided by the embodiment of the invention can convert sound energy into electric energy to realize wireless charging.
Because the ultrasonic wave has the characteristics of high frequency, good directivity, long transmission distance, strong penetrating power, concentrated energy and the like, the ultrasonic wave is applied to the magnetostrictive element 3 in the embodiment of the invention, thereby realizing the conversion from the ultrasonic wave to the electric energy.
The following compares the conventional wireless charging technology using electromagnetic induction with the wireless charging using ultrasonic waves according to the embodiment of the present invention.
Firstly, in the existing electromagnetic induction wireless charging technology, a transmitting end and a receiving end are required to be aligned, the charging distance is short, for example, less than 10 cm, the wireless charging device cannot be used by a user in the charging process, and the charging flexibility is poor; in the wireless charging technology of the embodiment of the invention, long-distance charging can be realized, for example, the charging distance can reach 4 meters, and the charging flexibility is higher.
Secondly, in the existing electromagnetic induction wireless charging technology, when metal exists between a transmitting end and a receiving end, the metal can generate induction eddy current, so that heat is generated, the charging efficiency is reduced, the safety risk is increased, and in addition, the charging equipment cannot use a metal shell; in the wireless charging technology of the embodiment of the invention, the ultrasonic wave has strong penetrating capability, can penetrate metal, and has higher service performance and safety performance.
In addition, in the existing electromagnetic induction wireless charging technology, in order to avoid safety accidents caused by heating due to the fact that the transmitting end transmits energy to nearby metal, the transmitting end needs to have foreign matter identification capability, and the requirement of the transmitting end is high; in the wireless charging technology of the embodiment of the invention, the transmitting terminal does not need to have the foreign object identification capability because the problem does not exist.
In the embodiment of the present invention, the magnetostrictive element 3 may be made of a rare earth intermetallic magnetostrictive material, for example, made of (Tb, Dy) Fe2The compound is an alloy of a matrix, and the thickness of the alloy can be about 25 mu m. The magnetostrictive material comprises: high energy conversion efficiency (more than or equal to 70 percent), adjustable elastic modulus, short response time (only one millionth of a second), good frequency characteristic (working at low frequency, dozens to 1000 Hz), wide working frequency band, good stability, high reliability, no change of magnetostrictive performance along with time, no fatigue, no overheating failure and the like.
The wireless charging device in the embodiment of the invention needs to be matched with an ultrasonic generator for use when being used for wireless charging. Thus, when the ultrasonic generator emits ultrasonic waves, the magnetostrictive element 3 of the wireless charging device undergoes repeated telescopic movements in the axial direction of the coil 2, so that the magnetic flux passing through the coil 2 changes and an induced potential is generated. When the coil 2 of the wireless charging device is connected with the rechargeable battery to form a closed loop, alternating current is output from two ends of the coil 2, and finally the alternating current is converted into direct current to be stored in the rechargeable battery.
In the embodiment of the present invention, the coil 2 may be formed by routing on the substrate 1. As shown in fig. 2 to 4, at least two first lines 21 are disposed on the first surface of the substrate 1 at intervals, and at least two second lines 22 are disposed on the second surface of the substrate 1 at intervals; at least two conducting lines 23 are arranged on the substrate 1 at intervals, the at least two conducting lines 23 penetrate through the substrate 1, and the at least two first lines 21 and the at least two second lines 22 are sequentially and alternately connected to form the coil 2 shown in fig. 4. Wherein, the first surface of the substrate 1 and the second surface of the substrate 1 are two opposite surfaces of the substrate 1. As shown in fig. 4, both ends of the coil 2 can be regarded as two electrodes of the coil 2, i.e., a first electrode 24 and a second electrode 25, and the first electrode 24 and the second electrode 25 are used for output of an electric signal.
The first line 21 and the second line 22 may be disposed on the substrate 1 by etching, or may be disposed on the substrate 1 by wiring, which is not limited in the embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 5 to 8, a cavity 4 may be formed in the substrate 1 along the axial direction of the coil 2, a magnetostrictive element 3 is disposed in the cavity 4, and the magnetostrictive element 3 may move telescopically along the cavity 4.
In the embodiment of the invention, the substrate 1 can be connected by the first insulating medium layer 11 and the second insulating medium layer 12 through the bonding layer 13; in this way, windows may be opened in the adhesive layer 13 to form the above-mentioned cavities 4. The magnetostrictive element 3 may be provided in the formed cavity 4. The height of the cavity 4 may be around 25 μm, and the length of the cavity 4 may be greater than the length of the magnetostrictive element 3 in order to provide a space for the magnetostrictive element 3 to move telescopically.
By providing the substrate 1 as two layers of insulating medium connected by the adhesive layer 13, it is easy to make a window in the adhesive layer 13 to provide the magnetostrictive element 3 as described above, which is simple to manufacture.
In the embodiment of the present invention, the substrate 1 may be provided with at least two via holes 5 at intervals, at least two via holes 5 penetrate through the substrate 1, and at least two conductive lines 23 are formed in at least two via holes 5.
In the embodiment of the present invention, the conductive line 23 interconnecting the first line 21 and the second line 22 may be formed by pouring a conductive paste, such as copper paste or silver paste, into the via hole 5; routing within the via 5 may also be employed to form a via line 23 interconnecting the first line 21 and the second line 22; it is also possible to deposit a conductive material in the via hole 5 to form a via line 23 interconnecting the first line 21 and the second line 22. The embodiment of the present invention is not limited thereto.
In the embodiment of the present invention, the at least two first lines 21 may be parallel lines, the at least two second lines 22 may also be parallel lines, and the at least two conducting lines 23 may also be parallel lines.
In this arrangement, the pitches between any two adjacent first lines 21 are equal to each other, the pitches between any two adjacent second lines 22 are equal to each other, and the pitches between any two adjacent conductive lines 23 are equal to each other. The coil 2 formed by the arrangement mode has better consistency of the whole coil 2.
Optionally, two ends of each first line 21 are respectively disposed opposite to one ends of two adjacent second lines 22, and at least two conducting lines 23 are perpendicular to the surface of the substrate 1.
In the embodiment of the present invention, one coil 2 and one magnetostrictive element 3 form one energy conversion unit, and the substrate 1 may be spaced apart from each other to form an energy conversion array (not shown) formed by connecting at least two energy conversion units in parallel.
In order to improve the wireless charging efficiency, at least two energy conversion units formed by the coil 2 and the magnetostrictive element 3 may be disposed on the substrate 1, so that an energy conversion array including at least two energy conversion units connected in parallel may be formed on the substrate 1. When at least two energy conversion units are included, the coils 2 of each energy conversion unit are connected in parallel in sequence.
In the embodiment of the present invention, the substrate 1 may be a substrate of a printed circuit board. Thus, the wireless charging device according to the embodiment of the present invention can be directly integrated into a printed circuit board of an electronic device (e.g., a digital camera, a charger, an electronic toy, a mobile phone, a computer, a tablet, a notebook, etc.). The Printed Circuit board may include a Rigid Circuit board (PCB), a Rigid-Flex board (RFPC), and a flexible Circuit board (fpc).
In the embodiment of the present invention, the substrate 1 may be a flexible board. In this way, the wireless charging device may be a wireless charging device having a bending property, and thus can be applied to a more complicated installation space and use space.
The embodiment of the invention also relates to a wireless charging system which comprises an ultrasonic generator and a wireless charging device.
Any wireless charging device in the embodiments of the present invention can be applied to the wireless charging system, and can achieve the same technical effect, and is not described herein again to avoid repetition.
The embodiment of the invention also relates to electronic equipment which comprises a power storage element and the wireless charging device, wherein the coil 2 of the wireless charging device is electrically connected with the power storage element.
Wherein, the electricity storage element can be a battery, and two electrodes of the battery are respectively connected with the first electrode 24 and the second electrode 25 of the coil 2 of the wireless charging device to form a closed loop, so that the current flowing through the coil 2 is transmitted to the battery to realize the charging of the battery.
Here, the specific electrical connection relationship between the power storage element and the wireless charging device may adopt a corresponding technical scheme in the existing wireless charging technology, and this is not described in detail in the embodiment of the present invention.
Any wireless charging device in the embodiments of the present invention may be applied to the electronic device, and may achieve the same technical effect, and is not described in detail for avoiding repetition.
In an embodiment of the present invention, the electronic Device may be a Computer (Computer), a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal digital assistant (PDA for short), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), an electronic reader, a navigator, a digital camera, and the like.
In addition, any one of the wireless charging devices in the embodiments of the present invention may also be applied to an electric vehicle.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A wireless charging device, comprising an insulating substrate provided with a coil and a magnetostrictive element;
the coil is provided with a solenoid structure, the magnetostrictive element is arranged in a space surrounded by the coil, and the magnetostrictive element can perform telescopic motion along the axial direction of the coil under the condition of receiving ultrasonic waves;
the substrate comprises a first insulating medium layer and a second insulating medium layer, wherein the first insulating medium layer is connected with the second insulating medium layer through an adhesive layer; and windowing the bonding layer between the first insulating medium layer and the second insulating medium layer to form a cavity.
2. The wireless charging device according to claim 1, wherein the first surface of the substrate is provided with at least two first lines at intervals, and the second surface of the substrate is provided with at least two second lines at intervals;
the substrate is provided with at least two conducting circuits at intervals, the at least two conducting circuits penetrate through the substrate, and the at least two first circuits and the at least two second circuits are sequentially and alternately connected to form the coil;
the substrate is provided with the cavity along the axial direction of the coil, the magnetostrictive element is arranged in the cavity, and the magnetostrictive element can move in a telescopic mode along the cavity;
wherein the first surface of the substrate and the second surface of the substrate are two opposite surfaces of the substrate.
3. The wireless charging device according to claim 2, wherein the substrate is provided with at least two via holes spaced apart, the at least two via holes each penetrating the substrate, and a wiring is provided in the at least two via holes to form the at least two via wirings.
4. The wireless charging device according to claim 2, wherein the at least two first lines are lines parallel to each other, the at least two second lines are lines parallel to each other, and the at least two conducting lines are lines parallel to each other.
5. The wireless charging device according to claim 4, wherein both ends of each first wiring are respectively disposed opposite to one ends of two adjacent second wirings, and the at least two conductive wirings are perpendicular to the surface of the substrate.
6. The wireless charging device according to any one of claims 1 to 5, wherein the coil and the magnetostrictive element form one energy conversion unit, and the substrate is provided with an energy conversion array formed by at least two energy conversion units connected in parallel at intervals.
7. The wireless charging device according to claim 2, wherein the substrate is a substrate of a printed circuit board.
8. A wireless charging system comprising an ultrasonic generator and the wireless charging device according to any one of claims 1 to 7.
9. An electronic apparatus characterized by comprising a power storage element and the wireless charging device according to any one of claims 1 to 7, the coil of the wireless charging device being electrically connected to the power storage element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810663045.5A CN108847721B (en) | 2018-06-25 | 2018-06-25 | Wireless charging device, wireless charging system and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810663045.5A CN108847721B (en) | 2018-06-25 | 2018-06-25 | Wireless charging device, wireless charging system and electronic equipment |
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| CN108847721A CN108847721A (en) | 2018-11-20 |
| CN108847721B true CN108847721B (en) | 2021-01-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0719246D0 (en) * | 2007-10-03 | 2007-11-14 | Feonic Plc | Transducer for vibration absorbing, sensing and transmitting |
| CN102684276B (en) * | 2012-04-01 | 2014-08-06 | 北京大学 | Underwater non-contact power supply method and device |
| CN202586514U (en) * | 2012-04-06 | 2012-12-05 | 天津工业大学 | EMSR electromagnetic energy transmitting and receiving system |
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Non-Patent Citations (2)
| Title |
|---|
| 一种磁致伸缩式超声波激发/接收传感器的研究;冯红亮等;《仪表技术与传感器》;20030725(第07期);全文 * |
| 磁致伸缩式扭转超声波位移传感器的研究与设计;黄卉等;《仪表技术与传感器》;20020625(第06期);全文 * |
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