Charging device

Abstract

The utility model relates to a charging device, the charging device comprises a substrate and a radiation assembly and a control assembly which are located on the substrate, the radiation assembly comprises a radiation unit and a feed unit, the control assembly comprises a driving unit and a coupling unit, the feed unit is coupled with the coupling unit, the coupling unit is electrically connected with the driving unit, and the driving unit is electrically connected with the substrate. The driving unit is electrically connected with the radiation unit; in the charging process, the feed unit is used for receiving a first signal sent by charged equipment and coupling the first signal to the coupling unit, the coupling unit transmits the first signal to the driving unit, the driving unit controls the radiating unit to emit a second signal, and the charged equipment receives the second signal and converts the second signal into electric energy, so that charging is achieved. According to the charging device, the space electric field can be used as an energy transmission medium, a connecting wire is not needed, the charged equipment only needs to be placed in the charging area, air charging of the charged equipment can be achieved, and great convenience and practicability are brought to users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a charging device. BACKGROUND

[0002] Wireless charging technology is a new technology that realizes power transmission based on air medium without any metal wire or physical medium as carrier through electromagnetic induction, resonance, microwave radiation and other forms. There are four common types: magnetic resonance, electromagnetic induction, electric field coupling and radio wave. Electromagnetic induction is a widely used method, and compared with the other three wireless charging methods, electromagnetic induction technology is more mature, and the charging efficiency is higher than other methods. Secondly, its implementation structure is simpler and more stable. Users only need to place the device on the charging pad or charging station, and the built-in receiver of the device will interact with the transmitter of the charger to realize energy transmission.

[0003] Although wireless charging brings convenience, it also has some disadvantages, such as low efficiency, slow charging speed, high cost, low compatibility, inability to charge while moving, heating problem, short charging distance, usually only a few millimeters to a few centimeters, damage to the battery, and the battery needs to supply power to the device while charging, which may cause greater damage to the battery, especially in the case of serious heating. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a safe, convenient and efficient air charging device.

[0005] In order to achieve the above purpose, the present application provides a charging device configured to charge a charged device, the charging device comprising:

[0006] a substrate comprising a first surface and a second surface opposite to each other;

[0007] a radiation assembly arranged on the first surface, the radiation assembly comprising a radiation unit and a feeding unit;

[0008] a control assembly arranged on the second surface, the control assembly comprising a driving unit and a coupling unit;

[0009] wherein the feeding unit is coupled with the coupling unit, the coupling unit is electrically connected with the driving unit, and the feeding unit is configured to receive a first signal emitted by the charged device;

[0010] the driving unit is electrically connected with the radiation unit, and the driving unit is configured to control the radiation unit to emit a second signal to the charged device.

[0011] In some embodiments, the first signal and the second signal are both electromagnetic wave signals, and phases and / or amplitudes of the first signal and the second signal are different.

[0012] In some embodiments, the radiation unit includes a plurality of radiation structures, and the driving unit includes a plurality of thin film transistors, and the radiation structures are connected to the thin film transistors one by one.

[0013] In some embodiments, the driving unit includes:

[0014] a gate electrode disposed on a side of the substrate away from the radiation assembly;

[0015] an active layer disposed on a side of the gate electrode;

[0016] a gate insulating layer disposed between the gate electrode and the active layer; and

[0017] a source electrode and a drain electrode disposed on a side of the active layer away from the substrate.

[0018] The radiation unit is connected to the source electrode or the drain electrode through a first via hole penetrating the substrate and the gate insulating layer.

[0019] In some embodiments, the driving unit further includes:

[0020] a driving element disposed on the second surface, and the driving element is connected to the thin film transistor.

[0021] In some embodiments, the driving element includes at least one of a driving chip, a flexible circuit board, and a driving circuit board.

[0022] In some embodiments, the feeding unit includes a plurality of feeding structures, and the coupling unit includes a plurality of coupling structures, and the feeding structures correspond to the coupling structures one by one.

[0023] In some embodiments, the coupling structure includes a radio frequency coil.

[0024] In some embodiments, the charging device further includes:

[0025] a signal connector disposed on the first surface, and the signal connector is connected to the feeding unit.

[0026] In some embodiments, the radiation unit is configured to receive the first signal emitted by a charged device along a charging path, and the driving unit is configured to record the charging path and control the radiation unit to emit the second signal in the reverse direction along the charging path.

[0027] The application provides a charging device, which is characterized in that a radiation assembly and a control assembly are arranged on a first surface and a second surface of a substrate respectively, the radiation assembly comprises a radiation unit and a feeding unit, the control assembly comprises a driving unit and a coupling unit, the feeding unit is coupled with the coupling unit, the coupling unit is connected with the driving unit, and the driving unit is connected with the radiation unit; during the charging process, the feeding unit is used for receiving a first signal emitted by a charged device, and the first signal is coupled to the coupling unit, the coupling unit transmits the first signal to the driving unit, the driving unit controls the radiation unit to emit a second signal, the charged device receives the second signal and converts the second signal into electric energy, so that the charging is realized. The charging device provided by the application can use a spatial electric field as an energy transmission medium, and does not need a connecting line, so that the charged device can be charged in the air, great convenience and practicability are brought to users, and a more safe, convenient and efficient charging mode is provided. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] In order to more completely understand the application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0030] Figure 1 is a structural schematic diagram of a charging device provided by an embodiment of the application;

[0031] Figure 2 is a sectional schematic diagram of a charging device provided by an embodiment of the application;

[0032] Figure 3 is a first surface top view of a charging device provided by an embodiment of the application;

[0033] Figure 4 is a second surface top view of a charging device provided by an embodiment of the application;

[0034] Figure 5 is a path schematic diagram of a first signal emitted by a charged device when there is no obstacle provided by an embodiment of the application;

[0035] Figure 6 is a path schematic diagram of a second signal emitted by a charging device when there is no obstacle provided by an embodiment of the application;

[0036] Figure 7is a path diagram provided by the embodiment of the present application when there is an obstacle, the charging device emits a first signal;

[0037] Figure 8 is a path diagram provided by the embodiment of the present application when there is an obstacle, the charging device emits a second signal.

[0038] Legend:

[0039] 100, charging device; 101, second signal; 110, substrate; 111, first surface; 112, second surface; 120, radiation component; 121, radiation unit; 1211, radiation structure; 122, feed unit; 1221, feed structure; 130, control component; 131, drive unit; 1311, gate; 1312, gate insulating layer; 1313, active layer; 1314, source; 1315, drain; 1316, passivation layer; 1317, first via; 1318, second via; 132, thin film transistor; 133, drive element; 1331, drive chip; 1332, flexible circuit board; 1333, drive circuit board; 1334, connecting metal; 134, coupling unit; 1341, coupling structure; 140, signal connector; 200, charged device; 201, first signal; 300, obstacle. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0041] Wireless charging allows devices to charge without contacting the charging device, greatly improving the convenience of use. Using spatial electric field as the medium of energy transmission, it can achieve longer distance charging. With the development of 5G and Internet of Things technology, wireless charging technology can support more seamless connection and energy supply for devices, meet the higher requirements for energy and connectivity in the future, create a wireless charging network, and realize the interconnection of all things.

[0042] The over-the-air charging uses a space electric field as an energy transmission medium. The energy is converted into electromagnetic waves by a transmitter (i.e., a charging device), and then the electromagnetic waves are captured by a receiver (i.e., a charged device) and converted back into electric energy. The over-the-air charging can charge multiple devices at the same time. Users no longer need to plug in or find a charger. They only need to place the devices in a charging area to automatically charge the devices. The over-the-air charging breaks the shackles of traditional charging lines and brings great convenience and practicality to users. The over-the-air charging technology has a broad development prospect and can be widely applied to the fields of smart wear, smart home, medical treatment, industrial automation, smart logistics, automatic driving, office, supermarket, public place, charging station, mobile terminal, etc. The over-the-air charging technology is a safer, more convenient and hygienic charging method, especially for special scenarios, such as radiation, island, uninhabited area, disaster area, underwater, extreme space, artificial heart, etc.

[0043] The application provides a charging device 100 which can realize over-the-air charging of a charged device. Figure 1 and Figure 2 , Figure 1 and Figure 2 are structural schematic diagrams of a charging device 100 provided by an embodiment of the application.

[0044] The charging device 100 comprises a substrate 110, a radiation assembly 120 and a control assembly 130. The substrate 110 comprises a first surface 111 and a second surface 112 opposite to each other. The radiation assembly 120 is arranged on the first surface 111, and comprises a radiation unit 121 and a feeding unit 122. The control assembly 130 is arranged on the second surface 112, and comprises a driving unit 131 and a coupling unit 134. The feeding unit 122 is coupled with the coupling unit 134, and the coupling unit 134 is electrically connected with the driving unit 131. The feeding unit 122 is configured to receive a first signal emitted by the charged device, and couple the first signal to the coupling unit 134. The coupling unit 134 transmits the first signal to the driving unit 131. The driving unit 131 is electrically connected with the radiation unit 121, and is configured to control the radiation unit 121 to emit a second signal to the charged device to charge the charged device.

[0045] In the present application, when the charged device is in a low power state, the charged device is placed in the charging area of the charging device 100, the charged device emits the first signal indicating low energy, the charging device 100 receives the first signal emitted by the charged device through the feeding unit 122, and couples the first signal to the coupling unit 134, the coupling unit 134 transmits the first signal to the driving unit 131, the driving unit 131 controls the radiation unit 121 to emit the second signal, the charged device receives the second signal and converts it into electric energy to charge the charged device.

[0046] In the present application, the first signal and the second signal are both electromagnetic wave signals, and the phases and / or amplitudes of the first signal and the second signal are not the same. Electromagnetic wave technology is relatively mature, and its implementation structure is relatively simple and stable. Electromagnetic waves are easy to control, and the charging efficiency is relatively high. Specifically, the direction and shape of the beam can be controlled by the phase and amplitude of the electromagnetic wave, so that the electromagnetic wave signal can be transmitted and received directionally, which is beneficial to improve the quality of the signal emitted by the charging device 100, increase the receiving power, improve the signal-to-noise ratio, and reduce the interference to other users.

[0047] The charging device 100 of the present application can use spatial electric field as energy transmission medium, without the need for connection line, only need to place the charged device in the charging area, can realize the charged device's space charging, brings great convenience and practicality for the user.

[0048] In some embodiments, please refer to Figures 2-4The radiation unit 121 includes a plurality of radiation structures 1211, and the driving unit 131 includes a plurality of thin film transistors 132. For example, the plurality of radiation structures 1211 can be arranged in an array, and the plurality of thin film transistors 132 can be arranged in an array. The radiation structure 1211 is connected to the thin film transistor 132 in a one-to-one correspondence. The thin film transistor 132 corresponds to a control switch. The sequence of switching on and off of the thin film transistor 132 can control the phase of the electromagnetic wave. The size of the input voltage of the thin film transistor 132 can control the amplitude of the electromagnetic wave. Therefore, by controlling the thin film transistor 132, the direction and shape of the beam of the first signal can be adjusted, so that the radiation structure 1211 can emit the second signal in a directional manner. In this application, the radiation structure 1211 is connected to the thin film transistor 132 in a one-to-one correspondence, so that each radiation structure 1211 can be independently controlled by a thin film transistor 132 to switch on and off, thereby reducing power consumption. At the same time, the traditional free-space charging device usually needs multiple integrated circuits (ICs) to control the radiation structure, which is high in cost, power consumption and structure. However, the thin film transistor 132 is used to control the radiation structure 1211 in this application, which can reduce the number of ICs, simplify the structure of the charging device 100, and reduce the cost.

[0049] Please refer to Figure 1 and Figure 2 In this application, a double-sided process is adopted. First, the radiation assembly 120 including the radiation unit 121 and the feeding unit 122 is prepared on the first surface 111 of the substrate 110. Then, the control assembly 130 including the thin film transistor 132 and the coupling unit 134 is prepared on the second surface 112 of the substrate 110. Due to the high density of the array of the radiation unit 121 and the array of the thin film transistor 132, the radiation unit 121 and the thin film transistor 132 are respectively located on the opposite surfaces of the substrate 110, so that the signal interference between the radiation unit 121 and the thin film transistor 132 can be avoided. The substrate 110 can be a glass substrate 110, but is not limited thereto.

[0050] In some embodiments, please refer to Figure 2 and Figure 4The driving unit 131 includes the thin film transistor 132, and the thin film transistor 132 includes a gate 1311, a gate insulating layer 1312, an active layer 1313, a source 1314 and a drain 1315. The gate 1311 is arranged on the side of the substrate 110 away from the radiation component 120, the active layer 1313 is arranged on the side of the gate 1311, the gate insulating layer 1312 is arranged between the gate 1311 and the active layer 1313, and the source 1314 and the drain 1315 are arranged on the side of the active layer 1313 away from the substrate 110. The thin film transistor 132 can be a bottom gate structure, a top gate structure or other conventional structures in the art, which are not limited in the present application. Taking the bottom gate structure as an example, please refer to Figure 2 The gate 1311 is arranged on the side of the substrate 110 away from the radiation component 120; the gate insulating layer 1312 is arranged on the side of the gate 1311 away from the substrate 110; the active layer 1313 is arranged on the side of the gate insulating layer 1312 away from the gate 1311; and the source 1314 and the drain 1315 are arranged on the side of the active layer 1313 away from the gate insulating layer 1312. The gate 1311, the active layer 1313, the source 1314 and the drain 1315 constitute the thin film transistor 132, and the radiation unit 121 is electrically connected with the source 1314 or the drain 1315 through the first via hole 1317 penetrating through the substrate 110 and the gate insulating layer 1312, so as to realize the control of the thin film transistor 132 on the radiation unit 121.

[0051] Further, the driving unit 131 further includes a passivation layer 1316 covering the source 1314, the drain 1315, the coupling unit 134 and the active layer 1313, so as to protect the source 1314, the drain 1315, the coupling unit 134 and the active layer 1313.

[0052] In some embodiments, please refer to Figure 2The driving unit 131 further comprises a driving element 133 disposed on the second surface 112, and the driving element 133 is connected with the thin film transistor 132. The driving element 133 comprises at least one of a driving chip 1331 (IC), a flexible printed circuit 1332 (FPC) and a printed circuit board 1333 (PCB). In the present application, the driving element 133 is used to control the thin film transistor 132, and then the thin film transistor 132 is used to control the radiation unit 121 one by one. Therefore, the charging device 100 can be controlled by using fewer driving chips (IC), so that the power consumption and cost are reduced, and the driving unit 131 has high integration and high reliability, which is beneficial to improve the performance of the charging device 100.

[0053] Specifically, referring to Figures 1-2 The driving element 133 comprises the driving chip 1331, the flexible printed circuit 1332 and the printed circuit board 1333. The driving chip 1331 and the flexible printed circuit 1332 are disposed on the side of the passivation layer 1316 away from the source electrode 1314 and the drain electrode 1315, the driving chip 1331 is connected with the source electrode 1314 or the drain electrode 1315 through a signal line, the flexible printed circuit 1332 is connected with the source electrode 1314 or the drain electrode 1315 through a signal line, and the printed circuit board 1333 is bound with the flexible printed circuit 1332. The driving chip 1331 and the flexible printed circuit 1332 can be connected with the source electrode 1314 or the drain electrode 1315 through a connecting metal 1334, respectively. The connecting metal 1334 is located on the side of the passivation layer 1316 away from the source electrode 1314 and the drain electrode 1315, and the connecting metal 1334 is connected with the source electrode 1314 or the drain electrode 1315 through a second via hole 1318 penetrating the passivation layer 1316.

[0054] In some embodiments, referring to Figures 2-4The feeding unit 122 includes a plurality of feeding structures 1221, the coupling unit 134 includes a plurality of coupling structures 1341, and the feeding structures 1221 correspond to the coupling structures 1341 one by one. The feeding structures 1221 and the coupling structures 1341 at least partially overlap in the direction perpendicular to the substrate 110, that is, in the direction perpendicular to the substrate 110, one feeding structure 1221 corresponds to one coupling structure 1341. The feeding structures 1221 and the coupling structures 1341 are located on opposite sides of the substrate 110 and correspond to each other one by one, so that the feeding structures 1221 and the coupling structures 1341 form a structure similar to a capacitor, and the feeding structures 1221 and the coupling structures 1341 are coupled to each other, which is beneficial to improve the signal transmission efficiency.

[0055] In some embodiments, referring to Figures 3-4 The coupling structure 1341 can be a radio frequency coil, the feeding structure 1221 can be metal, and the feeding structure 1221 and the coupling structure 1341 can be coupled to each other. The radio frequency coil can transmit and receive signals, which can improve the quality of signal transmission and is beneficial to improve the charging efficiency.

[0056] In some embodiments, referring to Figure 1 and Figure 3 The radiation unit 121 and the feeding unit 122 can be formed by one-time process patterning to simplify the process. The material of the radiation unit 121 and the material of the feeding unit 122 are the same, and the material of the radiation unit 121 and the material of the feeding unit 122 are metal, for example, copper, but are not limited thereto. The thickness of the radiation structure 1211 and the feeding structure 1221 ranges from 3um to 12um.

[0057] In some embodiments, referring to Figures 1-3 The charging device 100 further includes a signal connector 140, which is arranged on the first surface 111, is connected with the feeding unit 122, and is used to receive the first signal emitted by the charged equipment and then feed the first signal into the feeding unit 122. The signal connector 140 is beneficial to improve the signal transmission efficiency.

[0058] Referring to Figures 1-4In the use of the charging device 100, the first signal indicating low energy is fed into the feeding unit 122 through the signal connector 140, and the feeding unit 122 couples the first signal to the coupling unit 134; then the coupling unit 134 transmits the first signal to the driving unit 131, and the electromagnetic wave phase and / or amplitude of the first signal is changed after adjustment by the thin film transistor 132, and the second signal is emitted by the radiation unit 121, wherein the first signal and the second signal are both electromagnetic wave signals, and the second signal is the electromagnetic wave signal after phase and / or amplitude adjustment of the first signal; finally, the second signal is received by the charged device and converted into electric energy to charge the charged device.

[0059] The application controls the phase and amplitude of the electromagnetic wave by the thin film transistor 132 to control the direction and shape of the beam, so that the radiation unit 121 can realize directional sending and receiving of signals, thereby improving signal quality, increasing received power, improving signal-to-noise ratio, and reducing interference to other users.

[0060] In some embodiments, referring to Figure 1 , Figure 5 and Figure 6 , the radiation unit 121 is configured to receive the first signal 201 emitted by the charged device 200 along the charging path, and the driving unit 131 is configured to record the charging path and control the radiation unit 121 to emit the second signal 101 along the reverse direction of the charging path. Wherein, the charging path is also called the optimal charging path, and the first signal 201 emitted by the charged device 200 includes multiple different paths, the first signal 201 is reflected by air or the surface of an object, and finally captured by the radiation unit 121 on the charging device 100, and read by the driving chip 1331 through the thin film transistor 132, recording the charging path, that is, the path of the first signal 201 that can be emitted to the charging device 100 and received by the charging device 100 is the optimal charging path.

[0061] Referring to Figure 5 and Figure 6When the first signal 201 transmitted between the charged device 200 and the charging device 100 is not blocked by an obstacle, the first signal 201 emitted by the charged device 200 along the charging path is all received by the charging device 100, and the charging device 100 records the charging path and emits the second signal 101 along the reverse direction of the charging path to charge the charged device 200.

[0062] In the present application, the charging device 100 can also receive the low-energy electromagnetic wave signal emitted by the charged device 200 to find the optimal charging path and actively avoid people to protect the safety of people.

[0063] Please refer to Figure 7 and Figure 8 Before charging, the first signal 201 emitted by the charged device 200 is reflected by air or the surface of an object and finally captured by the radiation unit 121 on the charging device 100 and read by the driving chip through the thin film transistor to record the charging path. When the first signal 201 emitted by the charged device 200 is blocked by an obstacle 300 (for example, a person) for part of the charging path, the charging device 100 cannot receive the first signal 201 blocked by the obstacle 300, that is, the obstacle 300 is detected, and the charging device 100 emits the second signal 101 along the reverse direction of the other charging path that avoids the obstacle 300 to charge the charged device 200 to protect the safety of people.

[0064] In summary, the present application provides a charging device, which is provided with a radiation assembly and a control assembly on the first surface and the second surface of the substrate, respectively. The radiation assembly includes a radiation unit and a feeding unit, and the control assembly includes a driving unit and a coupling unit. The feeding unit is coupled with the coupling unit, the coupling unit is connected with the driving unit, and the driving unit is connected with the radiation unit. During the charging process, the feeding unit is used to receive the first signal emitted by the charged device and couple the first signal to the coupling unit. The coupling unit transmits the first signal to the driving unit, and the driving unit controls the radiation unit to emit the second signal. The charged device receives the second signal and converts it into electric energy to achieve charging. The charging device of the present application can use a spatial electric field as an energy transmission medium without connecting wires. The charged device can be charged in the air in the charging area, which brings great convenience and practicality to users and provides a more safe, convenient and efficient charging method.

[0065] In the description of the application, the terms "first", "second", "third" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0066] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0067] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0068] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A charging device configured to charge a charged device, characterized by, The charging device comprises: a substrate comprising a first surface and a second surface opposite to each other; a radiation assembly arranged on the first surface, the radiation assembly comprising a radiation unit and a feeding unit; a control assembly arranged on the second surface, the control assembly comprising a driving unit and a coupling unit; wherein the feeding unit is coupled with the coupling unit, the coupling unit is electrically connected with the driving unit, and the feeding unit is configured to receive a first signal emitted by the device to be charged; the driving unit is electrically connected with the radiation unit, and the driving unit is configured to control the radiation unit to emit a second signal to the device to be charged.

2. The charging device of claim 1, wherein, The first signal and the second signal are both electromagnetic wave signals, and the first signal and the second signal are different in phase and / or amplitude.

3. The charging device of claim 1, wherein, The radiation unit comprises a plurality of radiation structures, and the driving unit comprises a plurality of thin film transistors, the radiation structures being connected with the thin film transistors one by one.

4. The charging device of claim 3, wherein, The driving unit comprises: a gate electrode arranged on a side of the substrate away from the radiation assembly; an active layer arranged on a side of the gate electrode; a gate insulating layer arranged between the gate electrode and the active layer; and a source electrode and a drain electrode arranged on a side of the active layer away from the substrate; wherein the radiation unit is connected with the source electrode or the drain electrode through a first via hole penetrating through the substrate and the gate insulating layer.

5. The charging device of claim 3, wherein, The driving unit further comprises: a driving element arranged on the second surface, the driving element being connected with the thin film transistors.

6. The charging device of claim 5, wherein, The driving element comprises at least one of a driving chip, a flexible circuit board and a driving circuit board.

7. The charging device of claim 1, wherein, The feeding unit comprises a plurality of feeding structures, and the coupling unit comprises a plurality of coupling structures, the feeding structures being connected with the coupling structures one by one.

8. The charging device of claim 7, wherein, The coupling structure comprises a radio frequency coil.

9. The charging device of claim 1, wherein, The charging device further comprises: a signal connector arranged on the first surface, the signal connector being connected with the feeding unit.

10. The charging device according to any one of claims 1 to 9, characterized in that, The radiation unit is configured to receive the first signal emitted by the device to be charged along a charging path, and the driving unit is configured to record the charging path and control the radiation unit to emit the second signal along the reverse direction of the charging path.

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