CN218183084U - Wireless charging device - Google Patents

Abstract

The embodiment of the application discloses wireless charging device, the device adopt and feed more, multimode, the coherent operating mechanism of resonance, carry out wireless charging to the end device that receives can through the focusing field, effectively improve wireless charging efficiency and realize receiving the miniaturization of ability end antenna. The wireless charging device comprises a cavity and a phased array antenna; the cavity comprises even number of side faces, the even number of side faces are parallel in pairs, and each side face has the capacity of reflecting electromagnetic waves; the phased array antenna comprises an antenna array comprising a plurality of antennas; the plurality of antennas are arranged on the even number of side surfaces and are used for emitting electromagnetic waves to charge the energy-receiving equipment placed in the cavity; the distance between the two parallel sides is equal to an integer multiple of half the wavelength of the electromagnetic waves emitted by the first antenna, which is one antenna arranged on the two parallel sides, to generate a standing wave field in the cavity.

Description

Wireless charging device

Technical Field

The application relates to the technical field of charging, in particular to a wireless charging device.

Background

In recent years, wireless Power Transfer (WPT) industry is rapidly developing, and large-scale commercial application is firstly obtained in the fields of smart phones, smart wearing and the like; meanwhile, commercial applications in the fields of smart cars, internet of Things (IoT), industrial IoT, unmanned aerial vehicles, and the like have started, and a huge emerging industry is formed.

The current large-scale commercial use is mainly a contact type magnetic induction wireless charging technology, but the technology only omits a charging wire of a terminal and does not achieve true free space charging. In contrast, a "true" wireless charging technology represented by Radio Frequency (RF) wireless charging is rapidly developing, and it can realize remote spaced, non-contact, true free charging, and will become a new mainstream wireless charging technology in the next 10 years.

The RF wireless charging device is mainly classified into two types, i.e., an "internal charging type" and an "external charging type". The "external charging type" is to radiate electromagnetic wave energy to an energy receiving terminal in free space through various antenna/antenna arrays, and the "internal charging type" is based on a cavity structure, and a transmitting antenna/antenna array radiates electromagnetic wave energy to the energy receiving terminal in the cavity. Compared with the prior art, the external filling type is more free, and the internal filling type is higher in efficiency and safer.

However, the existing "internal charging type" wireless charging device does not fully consider the structure of the cavity and the influence of the antenna on the wireless charging efficiency, or an energy transmission blind area exists in the cavity, or the shape and the position of a high-efficiency charging area are difficult to flexibly adjust, resulting in poor wireless charging experience.

Disclosure of Invention

The embodiment of the application provides a wireless charging device, and the device adopts the work mechanism of presenting more, multimode, resonance coherence, carries out wireless charging to the end device that receives can through the focusing field, effectively improves wireless charging efficiency and realizes receiving the miniaturization of ability end antenna.

The application provides a wireless charging device, which comprises a cavity and a phased array antenna; wherein, a cavity can be understood as a body comprising an inner cavity; the cavity comprises even number of side faces, the even number of side faces are parallel in pairs, and each side face has the capacity of reflecting electromagnetic waves; the phased array antenna comprises an antenna array, a feed network and a controller, wherein the antenna array comprises a plurality of antennas, and the number of the antenna arrays can be one or more; the plurality of antennas are arranged on the even number of side surfaces and used for emitting electromagnetic waves to charge the energy-receiving equipment placed in the cavity, and the plurality of antennas are distributed on the even number of side surfaces under various conditions, which is not specifically limited in the application; the distance between the two parallel sides is equal to an integral multiple of a half-wavelength of an electromagnetic wave emitted by a first antenna, which is one antenna disposed on the two parallel sides.

Because the distance between the two parallel side surfaces is equal to the integral multiple of the half-wavelength of the electromagnetic wave emitted by the antenna, according to the theory of the resonant cavity, the electromagnetic wave emitted by the antenna and the electromagnetic wave form a resonant standing wave field after being reflected for many times by the side surfaces. And the resonance makes more energy radiate into the cavity inside to the resonance standing wave field can make the energy of radiation concentrate in the cavity, and is less to external radiation loss for the energy remains more in the cavity, thereby provides more energy for the equipment that receives in the cavity, thereby improves wireless charging efficiency, and is more energy-conserving more economical.

As an achievable mode, the cavity further comprises a bottom surface, and the bottom surface has the capacity of reflecting electromagnetic waves; the vertical distance between the second antenna and the bottom surface, which is equal to an integer multiple of the half-wavelength of the electromagnetic wave emitted by the second antenna, can also be understood as the height of the second antenna, which is one of the plurality of antennas.

Because the vertical distance between the antenna and the bottom surface is integral multiple of half-wavelength of the electromagnetic wave emitted by the antenna, the electromagnetic wave emitted by the antenna and the reflected wave of the electromagnetic wave reflected by the bottom surface can be coherently superposed, thereby improving the wireless charging efficiency, saving more energy and being more economical.

As one way of accomplishing this, the antenna comprises a radiating element; the ratio of the length of the resonance edge of the radiation oscillator to the length of the non-resonance edge is greater than or equal to 4; the resonant side of the radiation oscillator generally refers to the long side of the radiation oscillator, and the non-resonant side of the radiation oscillator generally refers to the short side of the radiation oscillator.

The ratio of the length of the resonant edge to the length of the non-resonant edge of the radiating oscillator is greater than or equal to 4, the oscillator directional diagram has the characteristics of wide beam and low gain, coupling among antennas can be effectively reduced, meanwhile, a proper radiating area is kept, and high-efficiency radiation efficiency is provided in a cavity which is most suitable for being used in a complex electromagnetic environment.

As one realizable way, the number of antennas in the antenna array is the same as the number of sides; one antenna of the antenna array is disposed on each side.

By arranging one antenna in the antenna array on each side face, the charging of the energy-receiving equipment is realized under the condition of adopting a small number of antennas, and the cost is reduced.

In an implementation, the frequencies of the electromagnetic waves emitted by the plurality of antennas are the same.

The frequency of the electromagnetic waves transmitted by the antennas is the same, and the coherent superposition process of the phased array antenna for controlling the electromagnetic waves is facilitated. The coherent superposition of the multimode resonance standing wave field generated by the multi-feed antenna at the position of the energy receiving antenna is realized to generate the energy focusing field with a single peak value, which is beneficial to the miniaturization of the energy receiving end antenna.

In an implementation, the cavity further includes a bottom surface, and the plurality of antennas are all at the same vertical distance from the bottom surface.

The vertical distances between the multiple antennas and the bottom surface are the same, and the coherent superposition process of the phased array antenna for controlling the electromagnetic waves is facilitated.

As one way of accomplishing this, the spacing between any two adjacent antennas in the plurality of antennas is equal.

The distance between any adjacent antennas in the multiple antennas is equal, and the coherent superposition process of the phased array antenna for controlling the electromagnetic waves is facilitated.

As one realizable way, the number of antenna arrays is plural; the vertical distances between the antennas in different antenna arrays and the bottom surface are different.

Because the number of the antenna arrays is multiple and the vertical distances between the antennas in different antenna arrays and the bottom surface are different, the antenna arrays with corresponding heights can be selected according to actual needs to supply power to the energy-receiving equipment.

In an achievable manner, the top end of the cavity is open.

The top end opening of cavity for wireless charging device is semi-enclosed construction, is convenient for put into the cavity and take out from the cavity by the energy equipment, can also guarantee that the communication function of energy equipment when charging can normal use, promotes the user and uses experience.

As an implementation manner, the wireless charging device further comprises a top cover; the top cover is arranged at the opening at the top end of the cavity, and the inner surface of the top cover has the capability of reflecting electromagnetic waves.

The inner surface of the top cover has the capacity of reflecting electromagnetic waves, so that the electromagnetic waves can be confined in the cavity, the energy leakage is reduced, and the charging efficiency is improved; meanwhile, the existence of the top cover provides more choices for the user, namely the user can close the top cover to improve the charging efficiency, and the user can open the top cover, so that the communication capacity of the enabled device is kept under the condition of ensuring higher charging efficiency.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a wireless charging apparatus provided in the present application;

FIG. 2 is a schematic view of the distance between the side surfaces in the embodiment of the present application;

FIG. 3 is a schematic high-level view of an antenna according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an embodiment of node and antinode interleaving in an embodiment of the present application;

fig. 5 is a schematic diagram illustrating a process of charging a powered device by a beam focusing method based on a time inversion algorithm according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.

For the sake of understanding, the following description will be made of terms used in the examples of the present application.

A phased array antenna refers to an antenna that changes the shape of a pattern by controlling the feeding phase of radiating elements in an antenna array.

The multi-feed means that a plurality of independent feed channels are arranged in the energy transmission cavity, and each feed channel can independently control the amplitude and the phase.

Multimode refers to different mode resonant standing wave fields excited by multiple antennas in a cavity, and the different resonant standing wave fields have the same resonant frequency but different spatial electric field distributions.

The resonance coherence means that a multimode resonance standing wave field is superposed with the same-phase vectors at an energized antenna to form an energy focusing field with a single peak value;

time reversal means that space coordinates are kept unchanged, and time coordinates change the transformation of symbols; in the frequency domain, the time reversal is equivalent to phase conjugation; in the time domain, time inversion refers to performing an inverse sequence operation in the time dimension on a time domain signal, that is, inverting the signal on the time axis so that the signal sampled at the earliest time becomes the signal at the latest time and the signal at the latest time becomes the signal at the earliest time.

The time reversal wireless energy transmission technology is that a sensor array is used for receiving detection signals, then time reversal processing is carried out on the energy transmission signals based on the amplitude and phase information of the detection signals, and then the sensor array transmits the energy transmission signals which are subjected to the time reversal processing; energy transmission signals emitted by the sensors automatically form electromagnetic energy focusing spots at source points (energy receiving end positions) of detection signals, so that power is supplied to equipment at the energy receiving end positions; the electromagnetic energy density at a source point deviating from the detection signal is rapidly reduced, and the wireless energy transmission with the spatial electromagnetic energy point focusing characteristic is also called point focusing wireless energy transmission.

The energy transmission device refers to a device for transmitting energy, and in the embodiment of the present application, may be specifically understood as a charging device.

The energy-receiving device refers to a device for receiving energy, and in the embodiment of the present application, may be specifically understood as a device to be charged.

A traveling wave (traveling wave) refers to a transmission state of a plane wave on a transmission line, and the amplitude of the traveling wave changes exponentially along the propagation direction, and the phase changes linearly along the transmission line.

Standing waves refer to two waves with the same frequency and opposite transmission directions, and are formed in a distribution state along a transmission line. One of the waves is typically a reflected wave of the other wave. The positions of nodes and antinodes of a standing wave are always constant on the waveform, giving the impression of "standing still", but its instantaneous value changes with time.

It should be understood that the cavity structure of the "internal charging type" wireless charging device may affect the reflection of the electromagnetic wave in the cavity, and further affect the distribution of the electromagnetic field in the cavity, and the distribution of the electromagnetic field may affect the wireless charging efficiency of the device capable of receiving energy in the cavity.

Based on this, the embodiment of the application provides a wireless charging device, and the device is through the design to the cavity for the electromagnetic wave of antenna transmission can form the standing wave in the cavity, and then forms the resonance standing wave field in the cavity, charges for the energy-receiving equipment in the cavity through the resonance standing wave field.

In the existing wireless charging device, the electromagnetic wave can be regarded as a traveling wave; because the traveling wave is continuously transmitted from the wave source to the outside, an electromagnetic field formed by the traveling wave is easily transmitted to the outside of the cavity, so that energy loss is caused, and the wireless charging efficiency is low; the resonant standing wave field is concentrated in the cavity, so that the radiation loss is less, and more energy is reserved in the cavity; therefore, through the design of the cavity, the standing wave field is formed in the cavity, more energy can be provided for the energy receiving equipment in the cavity, and the wireless charging efficiency is improved.

The following describes the wireless charging device provided in the embodiment of the present application in detail.

The wireless charging device that this application embodiment provided is used for providing contactless wireless charging for the equipment that receives can be smart mobile phone, intelligent wearing product (earphone, wrist-watch bracelet, glasses etc.), little household electrical appliances of intelligence and toy, the little smart machine of isovolumetric of remote controller.

As shown in fig. 1, the present application provides an embodiment of a wireless charging device comprising a cavity 1 and a phased array antenna.

The cavity 1 is understood to be a body comprising an inner cavity, which is defined by the side surfaces 2.

The cavity 1 comprises even number of side faces 2, and the even number of side faces 2 are parallel in pairs; each side surface 2 has the ability to reflect electromagnetic waves, and the side surface 2 may also be referred to as an electromagnetic wave emitting surface.

The shape of the inner cavity of the cavity 1 is not specifically limited in the embodiment of the application, and the shape of the inner cavity only needs to include an even number of side faces 2 which are parallel pairwise; the number of the inner side surfaces 2 of the cavity 1 in the embodiment of the present application is not particularly limited, for example, the number of the side surfaces 2 may be 4, 6, 8, and the like.

Fig. 1 shows a case where the number of the side faces 2 is 8, and accordingly, the inner shape of the cavity 1 (i.e., the shape of the inner cavity) may be a regular octagonal prism shape; when the number of the side surfaces 2 is 6, the inner shape of the cavity 1 may be a prism shape of a regular hexagonal octagon.

The side surfaces 2 are generally vertical with respect to the bottom surface 5 of the chamber 1.

It should be noted that, in fig. 1, in order to show the components on the bottom surface 5, the bottom surface 5 presents a non-smooth structure; in practice, however, the bottom surface 5 is generally smooth.

In order to make the side surface 2 have the capability of reflecting electromagnetic waves, the material of the side surface 2 has various choices, which is not specifically limited in the embodiment of the present application; for example, the side surface 2 may be selected from a PCB, a metal (e.g. copper) shielding plate, or some non-metal material with good shielding and reflection effects on electromagnetic waves.

The external shape of the cavity 1 is not particularly limited in the embodiments of the present application, for example, as shown in fig. 1, the external shape of the cavity 1 may be a cylinder; the outer shape of the cavity 1 may also be the same as the inner shape of the cavity 1, for example, when the inner shape of the cavity 1 is a prism shape of a regular octagon, the outer shape of the cavity 1 is also a prism shape of a regular octagon.

A phased array antenna typically comprises an antenna array, a feed network and a controller, wherein the feed network and the controller may be arranged on the bottom surface 5 of the cavity 1, as shown in fig. 1.

The embodiments of the present application mainly improve the antenna array, so the following mainly describes the antenna array, the feeding network and the controller, which can be understood by referring to the prior art.

The phased array antenna comprises an antenna array comprising a plurality of antennas 3.

The number of the antenna arrays may be one or multiple, and the following description first describes the multiple antennas 3 in one antenna array, and then describes the case of multiple antenna arrays.

In particular, a plurality of antennas 3 are provided on an even number of sides 2 and are used to emit electromagnetic waves to charge an energy-enabled device 4 placed inside the cavity 1.

The distribution of the plurality of antennas 3 on the even number of side surfaces 2 is not particularly limited in this embodiment, and the distribution of the plurality of antennas 3 will be specifically described below.

First, the height of the antenna 3.

This height is relative to the bottom surface 5 of the cavity 1, and therefore this height can also be understood as the perpendicular distance between the antenna 3 and the bottom surface 5.

In an implementation, the cavity 1 further comprises a bottom surface 5, and the bottom surface 5 has an ability to reflect electromagnetic waves. The material of the bottom surface 5 is similar to the side surface 2 and can be understood with particular reference to the description of the side surface 2.

The perpendicular distance between the second antenna, which is one of the plurality of antennas 3, and the bottom surface 5 is equal to an integral multiple of a half-wavelength of the electromagnetic wave emitted by the second antenna.

For example, when the frequency of the electromagnetic wave is 5.8GHz, the perpendicular distance between the second antenna and the bottom surface 5 may be 2 times the half wavelength, i.e., 5.17cm.

The vertical distance between the second antenna and the bottom surface 5 may be the vertical distance between the center of the second antenna and the bottom surface 5; the second antenna comprises a radiating element, and the vertical distance between the second antenna and the bottom surface 5 may also be the vertical distance between the radiating element and the bottom surface 5.

Because the vertical distance between the antenna 3 and the bottom surface 5 is an integral multiple of the half-wavelength of the electromagnetic wave transmitted by the antenna 3, the electromagnetic wave transmitted by the antenna 3 and the reflected wave of the electromagnetic wave reflected by the bottom surface 5 can be coherently superposed, thereby improving the wireless charging efficiency and saving more energy and being more economical.

For the plurality of antennas 3 in the antenna array, the vertical distance between at least one antenna 3 and the bottom surface 5 is an integral multiple of a half wavelength of the electromagnetic wave emitted by the antenna 3, i.e. a standing wave is generated in the cavity 1, so the second antenna is used in the embodiment of the present application to represent one of the plurality of antennas 3.

Based on the above description, as another achievable way, when the cavity 1 further includes a bottom surface 5, the vertical distances between the plurality of antennas 3 and the bottom surface 5 are the same, i.e. the vertical distances between all the antennas 3 in the antenna array and the bottom surface 5 are the same.

At this point, all antennas 3 in the antenna array may be considered to be at the same height.

Second, the correspondence of the antenna 3 and the side face 2.

One side surface 2 may be provided with one antenna 3, or a plurality of antennas 3, which is not specifically limited in this embodiment of the present application.

Exemplarily, the number of antennas 3 in the antenna array is the same as the number of sides 2; each side face 2 is provided with one antenna 3 in the antenna array, the position of the antenna 3 on the side face 2 is not particularly limited in the embodiment of the present application, and the antenna 3 may be arranged at a position of a center line on the side face 2 or at a position deviating from the center line on the side face 2.

For example, as shown in fig. 1, the number of the side faces 2 is 8, and the number of the antennas 3 is also 8.

Set up an antenna 3 on every side 2, can guarantee that adjacent antenna 3's interval is roughly the same to the phased array antenna adopts phased array technique to charge by energy-receiving equipment 4.

Third, the spacing of the antennas 3.

Specifically, as a realizable manner, the pitches of any two adjacent antennas 3 in the plurality of antennas 3 are equal.

For example, as shown in fig. 1, each antenna 3 is disposed in the middle of the side face 2, so that the plurality of antennas 3 are equally spaced.

The spacing of any adjacent antenna 3 of the plurality of antennas 3 is equal, which is more beneficial to controlling the emission of electromagnetic waves through the phased array antenna.

Fourth, the frequency of the electromagnetic waves emitted by the antenna 3.

As a realizable way, the frequency of the electromagnetic waves emitted by the plurality of antennas 3 is the same, which is more beneficial to controlling the coherent superposition process of the electromagnetic waves.

Fifth, the radiating element in the antenna 3.

In particular, the antenna 3 comprises a radiating element; the ratio of the length of the resonance edge of the radiating element to the length of the non-resonance edge is greater than or equal to 4.

The resonant side of the radiation oscillator generally refers to the long side of the radiation oscillator, and the non-resonant side of the radiation oscillator generally refers to the short side of the radiation oscillator.

It should be noted that, in order to reduce the interference between adjacent antennas 3, the antennas 3 are usually vertically disposed, that is, the resonant side of the radiating element is perpendicular to the bottom surface 5, and the non-resonant side of the radiating element is parallel to the bottom surface 5 and the side surface 2, so as to reduce the distance between the antennas 3.

As a practical way, the antenna 3 may be a narrow strip-shaped air microstrip antenna 3.

The ratio of the length of the resonant edge to the length of the non-resonant edge of the radiating oscillator is greater than or equal to 4, the oscillator directional diagram has the characteristics of wide beam and low gain, coupling between antennas can be effectively reduced, meanwhile, a proper radiating area is kept, and the radiating oscillator directional diagram is most suitable for providing high-efficiency radiation efficiency in a cavity with a complex electromagnetic environment.

Since one antenna 3 may be provided on one side surface 2, or a plurality of antennas 3 may be provided, in the embodiment of the present application, the distance between two parallel side surfaces 2 is equal to an integral multiple of a half wavelength of an electromagnetic wave emitted by a first antenna, which is one antenna 3 provided on the two parallel side surfaces 2.

For example, as shown in fig. 2, the cavity contains 8 sides 2, and only one antenna 3 is disposed on each side 2.

The distance between the side surfaces 2 is 5 times of the half wavelength transmitted by one antenna 3 on the side surface 2; for example, when the frequency of the electromagnetic wave emitted by one antenna 3 on the side faces 2 is 5.8GHz, the distance between the side faces 2 may be about 13cm.

The case of one antenna array is explained above, and the case of a plurality of antenna arrays is explained below.

When the number of the antenna arrays is multiple and the heights of the multiple antennas 3 in each antenna array are the same, the vertical distances between the antennas 3 in different antenna arrays and the bottom surface 5 are different.

It can also be simply understood that the wireless charging device provided by the embodiment of the present application includes a plurality of antenna arrays described above, and the heights of the plurality of antenna arrays are different.

For example, referring to fig. 3, the number of the antenna arrays is n, and the n antenna arrays have different heights and are all integer multiples of half-wavelength of the electromagnetic wave; the positions of the n antenna arrays are shown in fig. 3, and sequentially correspond to an antenna array position 1 and an antenna array position 2 … …, where the frequency of electromagnetic waves transmitted by the antenna 3 in each antenna array is the same, and the height difference between adjacent antenna arrays is 1 time of the half wavelength of the electromagnetic waves.

The antenna array in fig. 3 only shows 2 antennas 3, and it should be noted that the number of antennas 3 in the antenna array is not limited to 2.

Because the number of the antenna arrays is multiple and the vertical distances between the antennas 3 in different antenna arrays and the bottom surface 5 are different, the antenna arrays with corresponding heights can be selected as the power supply for the energy-receiving device 4 according to actual needs.

For example, depending on the height of the powered device 4 within the cavity 1, an antenna array of a corresponding height may be selected to power the powered device 4.

In the embodiment of the present application, since the distance between the two parallel side surfaces 2 is equal to the integral multiple of the half wavelength of the electromagnetic wave emitted by the antenna 3, according to the theory of the resonant cavity, the electromagnetic wave emitted by the antenna 3 forms a resonant standing wave field after being reflected for multiple times by the side surfaces 2. And resonance makes more energy radiate into the cavity inside to again because resonance standing wave field can make the energy of radiation concentrate more in cavity 1, external radiation loss is less for the energy remains more in cavity 1, thereby provides more energy for the energy receiving equipment 4 in cavity 1, thereby improves wireless charging efficiency, more energy-conserving more economical.

In a standing wave field, positions of an antinode and a node are fixed, so that the phenomenon of uneven energy distribution of waves exists in a charging scene, and the charging efficiency at different positions in the cavity 1 can be greatly different.

In view of the above problem, in the embodiment of the present application, a plurality of antennas 3 are disposed on the side surface of the cavity 1, so as to obtain a multi-feed antenna array; under the condition that the distance between the side surfaces in the cavity 1 is integral multiple of half wavelength of electromagnetic waves, the antenna array of the multi-feed source can form standing waves of various modes in the cavity 1; nodes and antinodes of the standing waves in different modes in the space of the cavity 1 are staggered with each other and are complementarily superposed, so that the energy distribution of the whole electromagnetic waves in the cavity 1 can be smoothed, the charging efficiency of each position in the cavity 1 is ensured to be approximately the same, and an energy transmission blind area (namely the position with low charging efficiency) is eliminated.

For example, as shown in fig. 4, fig. 4 shows two modes of standing waves, nodes and antinodes of the two modes of standing waves are staggered and complementarily superimposed, so that energy distribution of electromagnetic waves is uniform, charging efficiency at each position in the cavity 1 is substantially the same, and energy transmission dead zones are eliminated.

Based on the foregoing description, in the embodiment of the present application, the energy-receiving device 4 is powered by the phased array antenna, and the phase and the amplitude of the electromagnetic wave emitted by the antenna 3 can be controlled by the phased array antenna, so as to control the phase and the amplitude of the multi-mode standing wave generated by the resonant cavity, so that the multi-mode standing wave is coherently superposed at the energy-receiving device 4, a point-like energy focusing spot with a single peak is formed, more energy is provided for the energy-receiving device 4, and thus the charging efficiency is improved.

It should be noted that the phased array antenna may use different control methods to charge the energy receiving device 4, and the type of the control method is not specifically limited in the embodiment of the present application.

For example, a beam focusing method based on a time reversal method may be employed to charge the powered device 4. The charging process using this method will be described with reference to fig. 5.

As shown in fig. 5, the powered device 4 first transmits an energy transmission request signal; the phased array antenna receives the energy transmission request signal and extracts the amplitude phase of the energy transmission request signal to obtain the amplitude phase information of the energy transmission request signal; the phased array antenna performs phase regulation on signals output by the RF signal source through the phase shifter according to the amplitude phase information, then performs amplification and beam forming through the power amplifier, and finally transmits the signals through the antenna 3; the beam will be focused on the area of the enabled device 4, and the enabled device 4 will perform rectification processing after receiving, and then charge the built-in battery through the power management module (shown in fig. 5 as power management).

Based on the foregoing description, it can be known that the wireless charging device provided in the embodiment of the present application can generate a resonant standing wave field in the inner cavity, and the resonant standing wave field can confine most of energy inside the cavity 1 as much as possible, so that leakage of energy to outside the cavity is reduced, and electromagnetic radiation safety is improved.

On this basis, the top end of the cavity 1 is open as a realizable way.

The top end opening of cavity 1 for wireless charging device is semi-enclosed construction, is convenient for on the one hand to put into cavity 1 and take out from cavity 1 by ability equipment 4, and on the other hand can also guarantee that the communication function of ability equipment 4 when charging can normal use, promotes the user and uses experience.

It can be understood that, although the wireless charging device provided in the embodiments of the present application can reduce energy leakage, there is still a small amount of energy leakage, so to further improve charging efficiency, as an achievable way, the wireless charging device further includes a top cover.

The top cover is arranged at the top end opening of the cavity 1, and the inner surface of the top cover has the capacity of reflecting electromagnetic waves.

The inner surface of the top cover has the capacity of reflecting electromagnetic waves, so that the electromagnetic waves can be confined in the cavity 1, the energy leakage is reduced, and the charging efficiency is improved; meanwhile, the existence of the top cover provides more choices for the user, namely the user can close the top cover to improve the charging efficiency, and the user can open the top cover, so that the communication capacity of the energy-receiving equipment 4 is kept under the condition of ensuring higher charging efficiency.

Claims (10)

1. A wireless charging device, comprising a cavity and a phased array antenna;

the cavity comprises even number of side faces, the even number of side faces are parallel in pairs, and each side face has the capacity of reflecting electromagnetic waves;

the phased array antenna includes an antenna array including a plurality of antennas;

the plurality of antennas are arranged on the even number of side faces and are used for emitting electromagnetic waves to charge the energy-receiving equipment placed in the cavity;

the distance between the two parallel sides is equal to an integral multiple of a half-wavelength of an electromagnetic wave emitted by a first antenna, which is one of the antennas disposed on the two parallel sides.

2. The wireless charging device of claim 1, wherein the cavity further comprises a bottom surface, and the bottom surface has an ability to reflect electromagnetic waves;

a vertical distance between a second antenna, which is one of the plurality of antennas, and the bottom surface is equal to an integral multiple of a half-wavelength of an electromagnetic wave emitted by the second antenna.

3. The wireless charging apparatus of claim 1 or 2, wherein the antenna comprises a radiating element;

the ratio of the length of the resonance edge of the radiation oscillator to the length of the non-resonance edge is greater than or equal to 4.

4. The wireless charging apparatus of claim 1 or 2, wherein the number of antennas in the antenna array is the same as the number of sides;

one antenna of the antenna array is arranged on each side face.

5. The wireless charging device according to claim 1 or 2, wherein the frequencies of the electromagnetic waves emitted by the plurality of antennas are the same.

6. The wireless charging device of claim 1 or 2, wherein the cavity further comprises a bottom surface, and the plurality of antennas are all at the same vertical distance from the bottom surface.

7. The wireless charging device of claim 6, wherein any two adjacent antennas of the plurality of antennas are equally spaced.

8. The wireless charging device of claim 6, wherein the number of antenna arrays is plural;

the vertical distances between the antennas in different antenna arrays and the bottom surface are different.

9. The wireless charging device of any one of claims 1, 2, 7 and 8, wherein the top end of the cavity is open.

10. The wireless charging device of claim 9, further comprising a top cover;

the top cover is arranged at the opening at the top end of the cavity, and the inner surface of the top cover has the capacity of reflecting electromagnetic waves.

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