CN109412278B - Self-adaptive magnetic resonance wireless charging device and method - Google Patents
Self-adaptive magnetic resonance wireless charging device and method Download PDFInfo
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- CN109412278B CN109412278B CN201810934041.6A CN201810934041A CN109412278B CN 109412278 B CN109412278 B CN 109412278B CN 201810934041 A CN201810934041 A CN 201810934041A CN 109412278 B CN109412278 B CN 109412278B
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- 230000003044 adaptive effect Effects 0.000 claims abstract description 29
- 230000005672 electromagnetic field Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 5
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- 230000005684 electric field Effects 0.000 description 2
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Classifications
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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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
Abstract
The present disclosure provides an adaptive magnetic resonance wireless charging device, comprising: the transmitting terminal comprises an infrared sensor and is used for acquiring the space distance between the transmitting terminal and the receiving terminal, wherein the space distance is used for adjusting the coupling coefficient of the transmitting coil to be always at a coupling point. By utilizing the combination of the vector antenna technology and the sensor technology, the spatial structure characteristics of the receiving end and the transmitting end are intelligently judged, the coupling coefficient of the system is continuously adjusted, and the transmission efficiency and the transmission power of the system are always kept at the optimal values, so that the characteristics of long wireless charging action distance and high transmission efficiency are achieved.
Description
Technical Field
The disclosure relates to the technical field of electronics, in particular to a self-adaptive magnetic resonance wireless charging device and a method.
Background
With the increasing popularity of smart phones, the electric demands of various consumer electronic products are ubiquitous, and how to get rid of the constraint of traditional cables, so that the trouble of frequent charging is avoided, and the smart phones become a new way for pleasing consumers. The wireless charging technology (Wireless charging technology) is derived from a wireless power transmission technology, and is divided into a low-power wireless charging mode and a high-power wireless charging mode from power. From the technical realization point of view, the mature technical routes at present are as follows: electromagnetic induction, radio wave, magnetic resonance, and electric field induction. All current wireless charging implementations consist of two parts, namely transmitting and receiving. The currently mainstream wireless charging modes and corresponding standards include: the QI standard-electromagnetic induction mode deduced by the wireless charging alliance (Wireless Power Consortium); a magnetic resonance mode of international wireless charging industry Alliance (AirFuel Alliance) combined with A4WP (Alliance for Wireless Power) and PMA (Power Matters Alliance); a radio wave charging mode and an electric field coupling type wireless charging mode. The above-mentioned several technical implementation manners have advantages and disadvantages, and in comprehensively considering the influence of charging power, charging efficiency, technical feasibility and cost on the consumption electronic products, a novel implementation method of the magnetic induction wireless charging technology is needed, and the problem of wireless charging within a distance of 50mm can be solved while the charging power and the charging efficiency are considered.
Disclosure of Invention
First, the technical problem to be solved
The present disclosure provides an adaptive magnetic resonance wireless charging device and method to at least partially solve the above-mentioned technical problems.
(II) technical scheme
According to one aspect of the present disclosure, there is provided an adaptive magnetic resonance wireless charging apparatus comprising: the transmitting terminal comprises an infrared sensor and is used for acquiring the space distance between the transmitting terminal and the receiving terminal, wherein the space distance is used for adjusting the coupling coefficient of the transmitting coil to be always at a coupling point.
In some embodiments of the present disclosure, the transmitting end includes: a transmitting-end circuit board; the transmitting end magnetic shielding sheet is arranged above the transmitting end circuit board; at least one transmitting end coil arranged on the transmitting end magnetic shielding sheet; and one end of the infrared sensor is correspondingly arranged at the center of each transmitting end coil, and the other end of the infrared sensor is arranged on the transmitting end circuit board.
In some embodiments of the present disclosure, a receiving end includes: a receiving-end magnetic shielding sheet; at least one receiving-end coil is provided on the receiving-end magnetic shield sheet.
In some embodiments of the present disclosure, the coupling coefficient of the transmit coil is determined by two factors: the system comprises an empty resonance Q value and a load resonance Q value, wherein the load resonance Q value is dynamically adjusted according to the space distance between a transmitting end and a receiving end, which is obtained by measuring an infrared sensor.
In some embodiments of the present disclosure, the load resonance Q value is:
Q＝V2/(V1*L)，
wherein V1 is the voltage value of the input signal, V2 is the voltage value of the magnetic resonance generated through the resonance capacitor, and L is the spatial distance between the transmitting end and the receiving end.
In some embodiments of the present disclosure, the unloaded resonant Q value of the transmit coil may be determined according to the following equation:
Q＝π/(-ln(Rate))，
where Rate is the signal decay Rate.
In some embodiments of the present disclosure, the unloaded resonance Q value is determined by the diameter and number of turns of the coil.
According to another aspect of the present disclosure, there is provided an adaptive magnetic resonance wireless charging method, comprising:
s1: acquiring the space distance from a transmitting end to a receiving end through an infrared sensor, and determining the load resonance Q value of a coil according to the space distance;
s2: according to the load resonance Q value and the no-load resonance Q value of the coil, the coupling coefficient of the coil is determined, so that the coupling coefficient of the receiving and transmitting coil is always at a coupling point;
s3: the transmitting coil transfers energy to the receiving coil, which receives power and converts it into a current that can charge the device.
In some embodiments of the present disclosure, the step S2 includes, after the load resonance Q value is negatively adjusted by the spatial distance obtained by each infrared sensor, determining the coupling coefficient of the coil according to the load resonance Q value, so that the coupling coefficient of the transceiver coil is always at the coupling point, and adjusting the transmitting power and the resonance frequency of each coil, so that the transmitting power and the transmitting efficiency reach the optimal values.
In some embodiments of the present disclosure, the step S3 includes injecting an oscillating current into the high resonant transmitting coil using a charger of a resonant technology to generate an oscillating electromagnetic field, and a receiving coil having the same resonant frequency receives power from the electromagnetic field and converts it into a current that can charge the device.
(III) beneficial effects
From the above technical solution, the adaptive magnetic resonance wireless charging device and method of the present disclosure have at least the following beneficial effects:
by utilizing the combination of the vector antenna technology and the sensor technology, the spatial structure characteristics of the receiving end and the transmitting end are intelligently judged, the coupling coefficient of the system is continuously adjusted, and the transmission efficiency and the transmission power of the system are always kept at the optimal values, so that the characteristics of long wireless charging action distance and high transmission efficiency are achieved.
Drawings
Fig. 1 is a schematic structural diagram of an adaptive magnetic resonance wireless charging device according to a first embodiment of the disclosure.
Fig. 2 is a schematic diagram of transmit coil signal attenuation in an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a transmit coil determining a Q value at load resonance in an embodiment of the present disclosure.
Figure 4 is a flow chart of a method of an adaptive magnetic resonance wireless charging device in accordance with an embodiment of the present disclosure.
[ in the drawings, the main reference numerals of the embodiments of the present disclosure ]
1. A receiving end coil; 2. a receiving-end magnetic shielding sheet;
3. a transmitting end coil; 4. an infrared sensor;
5. a transmitting-end circuit board; 6. Transmitting end magnetic shielding sheet.
Detailed Description
The current commercial QI charging standard charging distance requirement is that the center distance of a receiving and transmitting coil is not more than 8mm, so that the defects of short acting distance and limited use space of the existing electromagnetic induction charging mode are overcome, and the self-adaptive magnetic resonance wireless charging device and method are provided, wherein the wireless charging distance can reach about 50mm, and meanwhile charging power and charging efficiency are considered.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
The existing principle of magnetic resonance charging is to tune the frequencies of the two coils to a resonance state, thereby generating electrical energy and performing wireless power transfer. Based on the principle of electromagnetic coupling, a charger using resonance technology injects an oscillating current into a high resonance coil to generate an oscillating electromagnetic field. A second coil having the same resonant frequency receives power from the electromagnetic field and converts it to a current that can charge the device.
When the transmitting coil starts to transmit energy to the receiving circuit, the existing magnetic resonance charging device can generate three working states according to the change of the resonance coupling coefficient: an under-coupling state, a critical coupling point, an over-coupling state. The difference of the three states causes the difference of charging power and charging efficiency, and the charging system itself does not know the external environment, so that the coupling coefficient cannot be automatically adjusted, and the magnetic resonance cannot be truly applied to consumer electronics in a large scale. The self-adaptive magnetic resonance device disclosed by the disclosure utilizes the combination of the vector antenna technology and the sensor technology to intelligently judge the spatial structural characteristics of the receiving end and the transmitting end, and continuously adjusts the coupling coefficient of the system, so that the transmission efficiency and the transmission power of the system always maintain the optimal values. Thereby achieving the characteristics of long wireless charging action distance and high transmission efficiency.
In a first exemplary embodiment of the present disclosure, an adaptive magnetic resonance wireless charging apparatus is provided. Fig. 1 is a schematic structural diagram of an adaptive magnetic resonance wireless charging device according to a first embodiment of the disclosure. As shown in fig. 1, the adaptive magnetic resonance wireless charging device of the embodiment comprises a transmitting end and a receiving end, wherein the transmitting end comprises a transmitting end coil 3, an infrared sensor 4, a transmitting end circuit board 5 and a transmitting end magnetic shielding sheet 6; the receiving end includes a receiving end coil 1 and a receiving end magnetic shield sheet 2.
The following describes each component of the adaptive magnetic resonance wireless charging device of the present embodiment in detail.
Wherein, at the receiving end, a plurality of receiving coils 1 are arranged on a receiving end magnetic shielding sheet 2; at the transmitting end, a plurality of transmitting end coils 3 are arranged on a transmitting end magnetic shielding sheet 6, an infrared sensor 4 is arranged in the center of each transmitting end coil 3, the infrared sensor adopts a time slice polling mode to scan the external environment in an array manner in a time stamp of 1ms, and a network can be formed by a plurality of coils to monitor the three-dimensional space structure in real time. One end of the infrared sensor 4 is disposed at the center of the transmitting-end coil 3, and the other end is disposed on the transmitting-end circuit board 5 below the transmitting-end magnetic shield sheet 6. In the embodiment, the diameter of the transmitting coil is 30-40 mm, and the turns of the coil meet the inductance value of 47uH; the diameter of the receiving coil is 20mm, and the turns of the coil meet the inductance value of 22uH.
The infrared sensor 4 of the transmitting end forms an infrared sensor array to measure the spatial distance from the external detected shell of the charged equipment, generally, the distance from the shell of the charged equipment to the coil of the receiving end in the shell is a fixed value, so that the spatial distance from the coil of the transmitting end to the coil of the receiving end can be obtained, and the self-adaptive magnetic resonance device dynamically adjusts the transmitting power and the resonance frequency of each transmitting coil according to the obtained spatial distance from the transmitting end to the receiving end.
The principle of dynamically adjusting the transmitting power and resonance frequency of each coil is as follows:
the coupling coefficient of a single coil is determined by two factors: no-load resonance Q value and resonance Q value under load.
The unloaded resonance Q value of the coil can be determined from q=pi/(-ln (Rate)), where Rate is the signal decay Rate. Fig. 2 is a schematic diagram of transmit coil signal attenuation.
Fig. 3 is a schematic diagram of a transmitting coil for determining Q value at load resonance. The load resonance Q value of the coil can be determined according to the resonance frequency point, in the adaptive magnetic resonance device of this embodiment, the no-load resonance Q value is determined by the diameter and the number of turns of the coil, and the load resonance Q value needs to be dynamically adjusted according to the spatial distance measured by the infrared sensor. The final load resonance Q value of the single coil is q=v2/(v1×l), where V1 is the voltage value of the input signal and V2 is the voltage value through the resonance capacitor (Resonance Capacitor) after the magnetic resonance is generated. V1 may adjust the duty cycle via the MCU. L is the distance from the transmitting end to the receiving end.
After the load resonance Q value is negatively regulated through the space distance measured by each infrared sensor, the coupling coefficient of the coil is determined according to the load resonance Q value, so that the coupling coefficient of the receiving and transmitting coil is always at a coupling point, and the transmitting power and the resonance frequency of each coil are regulated, so that the transmission power and the transmission efficiency reach the optimal values.
Of course, the above hardware structure should further include a power module (not shown) for supplying power to the infrared sensor, and these are understood by those skilled in the art, and those skilled in the art may add corresponding functional modules according to the functional needs, which is not described herein.
Thus, the description of the adaptive magnetic resonance wireless charging device of the first embodiment of the present disclosure is completed.
In a second exemplary embodiment of the present disclosure, an adaptive magnetic resonance wireless charging method is provided.
Figure 4 is a flow chart of a method of an adaptive magnetic resonance wireless charging device in accordance with an embodiment of the present disclosure. As shown in fig. 4, the adaptive magnetic resonance wireless charging method of the present embodiment includes:
step S1, measuring the space distance from the coil to the right of the infrared sensor, and determining the load resonance Q value of the coil;
step S2, determining the coupling coefficient of the coil according to the load resonance Q value and the no-load resonance Q value of the coil, so that the coupling coefficient of the receiving and transmitting coil is always at a coupling point;
in step S3, the transmitting coil begins to transfer energy to the receiving coil, which receives power from the electromagnetic field and converts it into a current that can charge the device.
The following describes each step of the adaptive magnetic resonance wireless charging device of the present embodiment in detail.
In step S1, the infrared sensor 4 measures the spatial distance of the charged device housing, thereby obtaining the spatial distance from the transmitting end to the receiving end, and in step S2, the adaptive magnetic resonance device dynamically adjusts the transmitting power and resonant frequency of each coil according to the measured spatial distance, so that the coupling coefficient of the receiving and transmitting coil is always at the coupling point, and the optimal values of the transmitting power and the transmitting efficiency are reached.
The coupling coefficient of a single coil is determined by two factors: no-load resonance Q value and resonance Q value under load.
The unloaded resonance Q value of the coil can be determined from q=pi/(-ln (Rate)), where Rate is the signal decay Rate. The load resonance Q value of the coil may be determined according to q=v2/V1, i.e. the resonance frequency point, where V1 is the voltage value of the input signal and V2 is the voltage value through the resonance capacitor after the magnetic resonance is generated. V1 may adjust the duty cycle via the MCU.
In the adaptive magnetic resonance wireless charging method of the embodiment, the unloaded resonance Q value is determined by the diameter of the coil and the number of turns, and the loaded resonance Q value needs to be dynamically adjusted according to the spatial distance measured by the infrared sensor. The final load resonance Q value of the single coil is q=v2/(v1×l), where L is the spatial distance from the transmitting end to the receiving end.
After the load resonance Q value is negatively regulated through the space distance measured by each infrared sensor, the coupling coefficient of the coil is determined according to the load resonance Q value, so that the coupling coefficient of the receiving and transmitting coil is always at a coupling point, and the transmitting power and the resonance frequency of each coil are regulated, so that the transmission power and the transmission efficiency reach the optimal values.
In step S3, a charger using resonance technology injects an oscillating current into a high-resonant transmitting coil, which generates an oscillating electromagnetic field, from which a receiving coil having the same resonance frequency receives power and converts it into a current that can charge the device.
Of course, according to actual needs, the method for manufacturing the display device of the present disclosure further includes other steps, which are not related to the innovations of the present disclosure, and will not be described herein.
For the sake of brevity, any description of the technical features of embodiment 1 that can be applied identically is incorporated herein, and the same description is not repeated.
Thus, the description of the adaptive magnetic resonance wireless charging method according to the second embodiment of the present disclosure is completed.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
It should be further noted that, the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings, and are not intended to limit the scope of the present disclosure. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present disclosure.
And the shapes and dimensions of the various elements in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
Furthermore, unless specifically described or steps must occur in sequence, the order of the above steps is not limited to the list above and may be changed or rearranged according to the desired design. In addition, the above embodiments may be mixed with each other or other embodiments based on design and reliability, i.e. the technical features of the different embodiments may be freely combined to form more embodiments.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also, in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (9)
1. An adaptive magnetic resonance wireless charging device, comprising: the transmitting end and the receiving end comprise a transmitting end coil and a receiving end coil with the same resonant frequency, the transmitting end comprises an infrared sensor for acquiring the space distance between the transmitting end and the receiving end,
the space distance is used for adjusting the coupling coefficient of the transmitting coil to be always at the coupling point, and the coupling coefficient of the transmitting coil is determined by two factors: the load resonance Q value is dynamically adjusted according to the space distance between the transmitting end and the receiving end, which is acquired by the infrared sensor.
2. The adaptive magnetic resonance wireless charging device of claim 1, wherein the transmitting end comprises:
a transmitting-end circuit board;
the transmitting end magnetic shielding sheet is arranged above the transmitting end circuit board;
at least one transmitting end coil arranged on the transmitting end magnetic shielding sheet; and
one end of the infrared sensor is correspondingly arranged at the center of each transmitting end coil, and the other end of the infrared sensor is arranged on the transmitting end circuit board.
3. The adaptive magnetic resonance wireless charging device of claim 2, wherein the receiving end comprises:
a receiving-end magnetic shielding sheet;
at least one receiving-end coil is provided on the receiving-end magnetic shield sheet.
4. The adaptive magnetic resonance wireless charging device of claim 1, wherein the load resonance Q value is:，
wherein V1 is the voltage value of the input signal, V2 is the voltage value of the magnetic resonance generated through the resonance capacitor, and L is the spatial distance between the transmitting end and the receiving end.
5. The adaptive magnetic resonance wireless charging device of claim 1, wherein the transmit coil's empty-load resonance Q value is determined according to the following equation:，
where Rate is the signal decay Rate.
6. The adaptive magnetic resonance wireless charging device of claim 5, the empty-load resonance Q value being determined by a diameter of the coil and a number of turns.
7. An adaptive magnetic resonance wireless charging method employing the adaptive magnetic resonance wireless charging apparatus as claimed in any one of claims 1-6, comprising:
s1: acquiring the space distance from a transmitting end to a receiving end through an infrared sensor, and determining the load resonance Q value of a coil according to the space distance;
s2: determining the coupling coefficient of the coil according to the determined load resonance Q value and the no-load resonance Q value of the coil, so that the coupling coefficient of the receiving and transmitting coil is always at a coupling point;
s3: the transmitting coil transfers energy to the receiving coil, which receives power and converts it into a current that can charge the device.
8. The method of claim 7, wherein the step S2 includes, after adjusting the load resonance Q value by the spatial distance obtained by each infrared sensor, determining the coupling coefficient of the coil according to the no-load resonance Q value, so that the coupling coefficient of the transceiver coil is always at the coupling point, and adjusting the transmitting power and the resonance frequency of each coil so that the transmitting power and the transmitting efficiency reach the optimal values.
9. The adaptive magnetic resonance wireless charging method as set forth in claim 7, the step S3 comprising injecting an oscillating current into the high-resonant transmitting coil using a charger of a resonance technique to generate an oscillating electromagnetic field, and receiving coils having the same resonance frequency receiving power from the electromagnetic field and converting it into a current for charging the device.
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| WO2021207928A1 (en) * | 2020-04-14 | 2021-10-21 | 上海卡珀林智能科技有限公司 | Magnetic resonance wireless charging system and method |
| CN115706456A (en) * | 2021-08-16 | 2023-02-17 | Oppo广东移动通信有限公司 | Charging transmitter, charging receiving terminal, wireless charging system and method |
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