CN104578222B - A wireless charging device and system - Google Patents

Abstract

Embodiments of the present invention provide a wireless charging device and system, which relate to the field of electronic technology, and provide a wireless charging solution, which solves the problem that the wireless charging device is heavy in design, and the transmitting end can only correspond to a single receiving end, and improves the wireless charging of the device. practicality. The method is as follows: the capacitor plate of the wireless charging receiving coil in the wireless charging adapter is correctly aligned with the capacitor plate of the wireless charging receiving circuit in the electronic device to form a complete receiving capacitor and form a receiver with the first inductance coil and the rectifier circuit. It is magnetically coupled with the wireless charging transmitting source to receive the electric energy sent by the wireless charging transmitting source; after being rectified by the rectifying circuit, it provides power for the load of the device to be charged.

Description

A wireless charging device and system

technical field

The present invention relates to the field of electronic technology, in particular to a wireless charging device and system.

Background technique

At present, wireless charging technology mostly uses capacitive coupling technology to realize energy transmission, and the energy is transferred to the receiving side through the capacitor formed by the combination of the transmitting end and the receiving end. However, most of this solution needs to integrate the coil in the receiving side circuit into the device to be charged. At the same time, the current tight coupling solution also needs to add a shielding magnetic sheet, which not only increases the thickness of the device, but also increases the weight of the device. Some wireless Charging accessories, such as the wireless charging shell protective cover of the mobile phone, must be added to the protective cover with a power interface to physically connect with the mobile phone to realize charging, which also leads to an increase in the size of the protective cover; There must be a one-to-one correspondence with the receiving end, and these problems reduce the practicality of wireless charging for devices.

Contents of the invention

Embodiments of the present invention provide a wireless charging device and system, which solves the problem that the design of the wireless charging device is heavy and one transmitting end can only correspond to a single receiving end, thereby improving the practicality of wireless charging for the device.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, a wireless charging component is provided, and the wireless charging component includes:

Wireless charging receiving coil, wireless charging receiving circuit and wireless charging transmitting source;

The wireless charging receiving coil includes: a first inductive coil, a first capacitive plate and a second capacitive plate, the first end of the first inductive coil is electrically connected to the first capacitive plate, and the first The second end of the inductance coil is electrically connected to the second capacitor plate;

The wireless charging receiving circuit includes: a rectification circuit, a third capacitor plate and a fourth capacitor plate, the first input terminal of the rectification circuit is electrically connected to the third capacitor plate, and the second capacitor plate of the rectification circuit The input terminal is electrically connected to the fourth capacitor plate;

The first capacitor plate and the third capacitor plate form a first capacitor when the alignment is correct, and the second capacitor plate and the fourth capacitor plate form a second capacitor when the alignment is correct; The correct alignment includes: the facing area of the first capacitive plate and the third capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the second capacitor plate and the fourth capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range;

The wireless charging transmitting source includes: a high-frequency power supply, a transmitting capacitor and a second inductive coil, the first end of the second inductive coil is electrically connected to the first end of the transmitting capacitor, and the first end of the second inductive coil The two ends are electrically connected to the first output end of the high-frequency power supply, and the second end of the emission capacitor is electrically connected to the second output end of the high-frequency power supply;

The transmitting capacitor and the second inductance coil form a transmitting resonant network with a preset resonant frequency, and the first coil, the first capacitor, and the second capacitor form a receiving resonant network; if the receiving resonant network Satisfying the magnetic resonance condition with the transmitting resonant network, the receiving resonant network receives electric energy from the transmitting resonant network, and the electric energy passes through the rectifying circuit, converts AC current into DC current output, and charges and supplies power for the load to be charged .

With reference to the first aspect, in a first possible implementation manner, the number of the wireless charging receiving coil included in the wireless charging component is at least one, and the number of the wireless charging receiving circuit is at least one;

The number of the wireless charging receiving coils is equal to the number of the wireless charging receiving circuits.

With reference to the first aspect, in a second possible implementation manner, the wireless charging component further includes:

a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network;

The compensation capacitor is connected in series between the first end of the first inductance coil and the first capacitor plate, or the compensation capacitor is connected in series between the second end of the first inductance coil and the second between the capacitor plates; or,

The compensation capacitor is connected in series between the first input terminal of the rectifier circuit and the third capacitor plate, or the compensation capacitor is connected in series between the second input terminal of the rectifier circuit and the fourth capacitor plate between the boards, or, the compensation capacitor is connected in parallel between the first input end of the rectification circuit and the second input end of the rectification circuit.

In a second aspect, a wireless charging receiving coil is provided, and the wireless charging receiving coil includes:

The first inductance coil, the first capacitor plate and the second capacitor plate, the first end of the first inductance coil is electrically connected to the first capacitor plate, and the second end of the first inductance coil is connected to the first capacitor plate. The second capacitor plate is electrically connected;

The first capacitor plate is used to form a first capacitor with the third capacitor plate in the wireless charging receiving circuit when the alignment is correct, and the second capacitor plate is used to form a first capacitor with the third capacitor plate in the wireless charging receiving circuit. The four capacitor plates form the second capacitor when the alignment is correct;

The correct alignment includes: the facing area of the first capacitive plate and the third capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the second capacitor plate and the fourth capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range;

The first inductance coil is used to form a receiving resonant network with the first capacitor and the second capacitor, and if the receiving resonant network and the transmitting resonant network meet the magnetic resonance condition, the receiving resonant network is separated from the The transmitting resonant network receives electrical energy.

With reference to the second aspect, in a first possible implementation manner, the wireless charging receiving coil further includes:

a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network;

The compensation capacitor is connected in series between the first end of the first inductance coil and the first capacitor plate, or the compensation capacitor is connected in series between the second end of the first inductance coil and the second between the capacitor plates.

In a third aspect, a wireless charging receiving circuit is provided, and the wireless charging receiving circuit includes:

A rectifier circuit, a third capacitor plate and a fourth capacitor plate, the first input terminal of the rectifier circuit is electrically connected to the third capacitor plate, the second input terminal of the rectifier circuit is connected to the fourth capacitor plate plate electrical connection;

The third capacitive plate is used to form a first capacitor with the first capacitive plate in the wireless charging receiving coil when the alignment is correct, and the fourth capacitive plate is used to form a first capacitor with the first capacitive plate in the wireless charging receiving coil. The plates of the second capacitor form the second capacitor when the alignment is correct;

The correct alignment includes: the facing area of the third capacitive plate and the first capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the four capacitor plates and the second capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range;

The first capacitor and the second capacitor are used to form a receiving resonant network with the first inductance coil in the wireless charging receiving coil. If the receiving resonant network and the transmitting resonant network meet the magnetic resonance condition, the The receiving resonant network receives electric energy from the transmitting resonant network, and the rectification circuit is used to convert the electric energy from an alternating current to a direct current output to charge and supply a load to be charged.

With reference to the third aspect, in a first possible implementation manner, the wireless charging receiving circuit further includes:

a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network;

The compensation capacitor is connected in series between the first input terminal of the rectifier circuit and the third capacitor plate, or the compensation capacitor is connected in series between the second input terminal of the rectifier circuit and the fourth capacitor plate between the boards, or, the compensation capacitor is connected in parallel between the first input end of the rectification circuit and the second input end of the rectification circuit.

In a fourth aspect, a wireless charging transmission source is provided, and the wireless charging transmission source includes:

A high-frequency power supply, a transmitting capacitor, and a second inductive coil, the first end of the second inductive coil is electrically connected to the first end of the transmitting capacitor, and the second end of the second inductive coil is connected to the high-frequency power supply The first output end of the transmission capacitor is electrically connected to the second output end of the high-frequency power supply;

The transmitting capacitor and the second inductance coil are used to form a transmitting resonant network with a preset resonant frequency, so as to perform magnetic resonance coupling with one or more receiving resonant networks composed of wireless charging receiving coils and wireless charging receiving circuits transmit electrical energy.

In a fifth aspect, a wireless charging adapter is provided, and the wireless charging adapter includes:

One or more wireless charging receiving coils as described in the second aspect or the first possible implementation manner of the second aspect.

With reference to the fifth aspect, in a first possible implementation manner, the wireless charging adapter further includes: the wireless charging transmission source as described in the fourth aspect.

In a sixth aspect, an electronic device is provided, and the electronic device includes:

The wireless charging receiving circuit and load as described in the third aspect or the first possible implementation of the third aspect;

The output end of the rectifier circuit in the wireless charging receiving circuit is electrically connected to the load.

In a seventh aspect, a wireless charging system is provided, and the wireless charging system includes:

The wireless charging adapter as described in the fifth aspect, the wireless charging transmitting source as described in the fourth aspect, and one or more electronic devices as described in the sixth aspect; or,

The wireless charging adapter described in the first possible implementation manner of the fifth aspect and one or more electronic devices described in the sixth aspect.

Embodiments of the present invention provide a wireless charging device and system. By correctly aligning the capacitor plate of the wireless charging receiving coil in the wireless charging adapter with the capacitor plate of the wireless charging receiving circuit in the electronic device, a complete receiving capacitor is formed and connected to the first capacitor. An inductance coil and a rectifier circuit form a receiver, which is magnetically coupled with the wireless charging transmitter to receive the electric energy sent by the wireless charging transmitter; and then rectified by the rectifier circuit to provide power to the load of the device to be charged. In this way, the problem that the design of the wireless charging device is thick and heavy, and one transmitting end can only correspond to a single receiving end is solved, thereby improving the practicability of wireless charging for the device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a wireless charging assembly provided by an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of a wireless charging receiving coil provided by an embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of a wireless charging receiving circuit provided by an embodiment of the present invention;

Fig. 4 is a schematic circuit diagram of a combination of a wireless charging receiving coil and a wireless charging receiving circuit provided by an embodiment of the present invention;

Fig. 5 is a schematic circuit diagram of a wireless charging transmitting source provided by an embodiment of the present invention;

Fig. 6A is a circuit schematic diagram 1 of a combination of a wireless charging receiving coil, a wireless charging receiving circuit, and a wireless charging transmitting source provided by an embodiment of the present invention;

Fig. 6B is a circuit schematic diagram 2 of a combination of a wireless charging receiving coil, a wireless charging receiving circuit, and a wireless charging transmitting source provided by an embodiment of the present invention;

Fig. 6C is a circuit schematic diagram 3 of a combination of a wireless charging receiving coil, a wireless charging receiving circuit, and a wireless charging transmitting source provided by an embodiment of the present invention;

Fig. 6D is a circuit schematic diagram 4 of a combination of a wireless charging receiving coil, a wireless charging receiving circuit, and a wireless charging transmitting source provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a wireless charging adapter provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a wireless charging system provided by an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of another wireless charging system provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a wireless charging assembly 00 , as shown in FIG. 1 , the wireless charging assembly 00 includes: a wireless charging receiving coil 01 , a wireless charging receiving circuit 02 , and a wireless charging transmitting source 03 .

Among them, the wireless charging receiving coil 01 includes: a first inductive coil L _s , a first capacitive plate C _s1p and a second capacitive plate C _s2p ; the wireless charging receiving circuit 02 includes: a rectifying circuit 021, a third capacitive plate C _s1s and the fourth capacitive plate C _s2s ; the wireless charging transmitting source 03 includes: a high-frequency power supply 031 , a transmitting capacitor C _p and a second inductive coil L _p .

Specifically, in the wireless charging receiving coil 01, as shown in FIG. 2 , the first end of the first inductive coil L _s is electrically connected to the first capacitive plate C _s1p , and the second end of the first inductive coil L _s is electrically connected to the first capacitive plate C s1p. The two capacitor plates C _s2p are electrically connected;

In the wireless charging receiving circuit 02, as shown in FIG. 3 , the first input end of the rectification circuit 021 is electrically connected to the third capacitor plate C _s1s , and the second input end of the rectification circuit 021 is electrically connected to the fourth capacitor plate C _s2s . connect.

The first capacitor plate C _s1p and the third capacitor plate C _s1s are used to form the first capacitor C _s1 when the alignment is correct, and the second capacitor plate C _s2p and the fourth capacitor plate C _s2s are when the alignment is correct When forming the second capacitor C _s2 ; the first capacitor C _s1 and the second capacitor C _s2 are used for parallel combination as the receiving capacitor C _s ;

Among them, correct alignment includes: the facing area of the first capacitor plate and the third capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range; The facing area of the four capacitor plates is within the first preset threshold range and the distance between the plates is within the second preset threshold range.

The first inductive coil L _s is used to form the receiver 04 with the receiving capacitor C _s and the rectifier circuit 021. As shown in FIG. 4 , the receiver 04 includes a receiving resonant network composed of the first inductive coil L _s and the receiving capacitor C _s , It is used to receive electric energy from the wireless charging transmitting source 03.

Specifically, in the wireless charging transmitting source 03, as shown in FIG. 5 , the first end of the second inductive coil L _p is electrically connected to the first end of the transmitting capacitor C _p , and the second end of the second inductive coil L _p is connected to The first output terminal of the high-frequency power supply 031 is electrically connected, the second end of the transmitting capacitor _Cp is electrically connected with the second output terminal of the high-frequency power supply 031, and the input terminal of the high-frequency power supply 031 is connected to an external power supply;

The transmitting capacitor C _p and the second inductance coil L _p are used to form a transmitting resonant network with a preset resonant frequency, and transmit electric energy to the receiver 04 .

It is worth mentioning that the transmitting resonant network in the wireless charging transmitting source 03 can send power to one receiver 04 with a receiving resonant network, or simultaneously send power to multiple receivers 04 with a receiving resonant network.

Optionally, the wireless charging component 00 may also include: a compensation capacitor C _s3 , which is used to coordinate the first capacitor C _s1 and the second capacitor C _s2 to adjust the receiving capacitor C _s according to design requirements. Exemplarily, the compensation capacitor C _s3 can be In the wireless charging receiving coil 01, it may also be in the wireless charging receiving circuit 02.

In an embodiment of the present invention, exemplary, the working principles of the wireless charging receiving coil 01, the wireless charging receiving circuit 02, and the wireless charging transmitting source 03 are shown in FIG. 6A:

In the wireless charging transmission source 03, the high-frequency power supply 031 is powered by an external input, and the output provides a high-frequency alternating current, which passes through the transmission resonant network composed of the second inductance coil L _p and the transmission capacitor C _p , with a preset resonance frequency f ₀ Electromagnetic oscillation is performed and electromagnetic waves are radiated outward. where the resonant frequency is:

The corresponding angular frequency, that is, the circuit parameters are:

In the receiver 04 composed of the first inductive coil L _s in the wireless charging receiving coil 01 and the receiving capacitor C _s in the wireless charging receiving circuit 02, the first inductive coil L _s and the receiving capacitor C _s form a receiving resonant network, when The receiving capacitor C _s and the receiving coil L _s satisfy:

It shows that the resonant frequency of the transmitting resonant network in the wireless charging transmitting source 03 and the receiving resonant network in the receiver 04 are equal at this time, and the wireless charging transmitting source 03 and the receiver 04 meet the magnetic resonance coupling condition, that is, the receiver 04 can transmit The electromagnetic wave sent by the source 03 obtains electric power. Furthermore, the obtained electric energy is rectified by the rectifier circuit 021 in the wireless charging receiving circuit 02, and the AC current is converted into a DC current to charge and supply the load equipment to be charged, so as to realize the purpose of wireless charging.

Optionally, as shown in FIG. 6B , according to the requirements for component selection during the design and manufacture of the wireless charging receiving coil 01 or the wireless charging receiving circuit 02 , such as product appearance, volume and manufacturing cost, etc., by changing the capacitor electrode On the basis of adjusting the capacitance values of the first capacitor C _s1 and the second capacitor C _s2 on the area facing the plate or the distance between the plates, a compensation capacitor C _s3 can also be added to the wireless charging receiving circuit 02 so that the receiving capacitor C _s and the first inductance The coil L _s satisfies:

It shows that the resonant frequency of the transmitting resonant network in the wireless charging transmitting source 03 and the receiving resonant network in the receiver 04 are equal at this time, and the wireless charging transmitting source 03 and the receiver 04 meet the magnetic resonance coupling condition, and the application method is the same as above, and no longer repeat.

Optionally, as shown in Figure 6C, according to the design requirements, a compensation capacitor C _s3 can also be added to the wireless charging receiving coil 01, so that the receiving capacitor C _s and the first inductance coil L _s satisfy:

It shows that the resonant frequency of the transmitting resonant network in the wireless charging transmitting source 03 and the receiving resonant network in the receiver 04 are equal at this time, and the wireless charging transmitting source 03 and the receiver 04 meet the magnetic resonance coupling condition, and the application method is the same as above, and no longer repeat.

Optionally, as shown in Figure 6D, according to the design requirements, a compensation capacitor C _s3 can also be added to the wireless charging receiving circuit 02, so that the receiving capacitor C _s and the first inductance coil L _s satisfy:

It shows that the resonant frequency of the transmitting resonant network in the wireless charging transmitting source 03 and the receiving resonant network in the receiver 04 are equal at this time, and the wireless charging transmitting source 03 and the receiver 04 meet the magnetic resonance coupling condition, and the application method is the same as above, and no longer repeat.

The embodiment of the present invention also provides a wireless charging adapter 05 , as shown in FIG. 7 , the wireless charging adapter 05 includes one or more wireless charging receiving coils 01 , which form a receiver 04 together with corresponding electronic devices.

Optionally, the wireless charging adapter 05 may also include a wireless charging transmission source 03 .

The embodiment of the present invention also provides an electronic device 06. As shown in FIG. 8, the electronic device 06 includes a wireless charging receiving circuit 02 and a load to be charged, and the output terminal of the rectifier circuit 021 in the wireless charging receiving circuit 02 is connected to the load to be charged. The load is electrically connected, and the output supplies power to the load to be charged.

The embodiment of the present invention also provides a wireless charging system 07 , the wireless charging system 07 includes: a wireless charging adapter 05 , a wireless charging transmission source 03 , and an electronic device 06 .

Exemplarily, the wireless charging adapter 05 can be a wireless charging table or a wireless charging tray, as shown in FIG. When the electronic device 06 integrated with the corresponding wireless charging receiving circuit 02 is placed on the corresponding position on the desktop or tray surface, the alignment of the first capacitor plate C _s1p and the third capacitor plate C _s1s is correct, and the second capacitor plate C _s2p and The alignment of the fourth capacitor plate C _s2s is correct, the wireless charging table or tray and the electronic device 06 form a complete receiver 04, and the receiver 04 wirelessly receives the wireless charging transmitting source 03 when the wireless charging transmitting source 03 is working normally to provide electric energy The transmitted electric energy realizes the purpose of wirelessly charging the electronic device 06 . Moreover, the wireless charging transmitting source 03 can simultaneously provide power to multiple receivers 04 to realize wireless charging of multiple electronic devices 06 .

Optionally, the wireless charging transmission source 03 can be integrated in the wireless charging table or tray, and can also be set outside the wireless charging table or tray, which can also achieve the above-mentioned purpose of wirelessly charging the electronic device 06, and can be selected according to design requirements plan.

Exemplarily, the wireless charging adapter 05 can also be a protective casing of the electronic device 06, as shown in FIG. 10 , a wireless charging receiving coil 01 is integrated in the protective casing. After that, the first capacitive plate C _s1p and the second capacitive plate C _s2p of the wireless charging receiving coil 01 are connected with the third capacitive plate C _s1s and the fourth capacitive plate C _s2s of the wireless charging receiving circuit 02 in the electronic device 05 The respective alignment is correct to form a complete receiver 04. When the wireless charging transmitter 03 is working normally to provide power, and the receiver 04 is within the preset range centered on the wireless charging transmitter 03, the electronic device 06 can be wirelessly charged , so as to solve the problem that the device to be charged is required to be close to the transmitting end during wireless charging, and the movable range of the device is small.

The above-mentioned implementation of the wireless charging adapter 05 is only exemplary, including but not limited thereto.

Embodiments of the present invention provide a wireless charging device and system. By correctly aligning the capacitor plate of the wireless charging receiving coil in the wireless charging adapter with the capacitor plate of the wireless charging receiving circuit in the electronic device, a complete receiving capacitor is formed and connected to the first capacitor. An inductance coil and a rectifier circuit form a receiver, which is magnetically coupled with the wireless charging transmitter to receive the electric energy sent by the wireless charging transmitter; and then rectified by the rectifier circuit to provide power to the load of the device to be charged. In this way, the problem that the design of the wireless charging device is thick and heavy, and one transmitting end can only correspond to a single receiving end is solved, thereby improving the practicability of wireless charging for the device.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (11)

1. A wireless charging component, characterized in that the wireless charging component comprises: Wireless charging receiving coil, wireless charging receiving circuit and wireless charging transmitting source; The wireless charging receiving coil includes: a first inductive coil, a first capacitive plate and a second capacitive plate, the first end of the first inductive coil is electrically connected to the first capacitive plate, and the first The second end of the inductance coil is electrically connected to the second capacitor plate; The wireless charging receiving circuit includes: a rectification circuit, a third capacitor plate and a fourth capacitor plate, the first input terminal of the rectification circuit is electrically connected to the third capacitor plate, and the second capacitor plate of the rectification circuit The input terminal is electrically connected to the fourth capacitor plate; The first capacitor plate and the third capacitor plate form a first capacitor when the alignment is correct, and the second capacitor plate and the fourth capacitor plate form a second capacitor when the alignment is correct; The correct alignment includes: the facing area of the first capacitive plate and the third capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the second capacitor plate and the fourth capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range; The wireless charging transmitting source includes: a high-frequency power supply, a transmitting capacitor and a second inductive coil, the first end of the second inductive coil is electrically connected to the first end of the transmitting capacitor, and the first end of the second inductive coil The two ends are electrically connected to the first output end of the high-frequency power supply, and the second end of the emission capacitor is electrically connected to the second output end of the high-frequency power supply; The transmitting capacitor and the second inductance coil form a transmitting resonant network with a preset resonant frequency, and the first inductive coil, the first capacitor and the second capacitor form a receiving resonant network; if the receiving resonant The network and the transmitting resonant network meet the magnetic resonance condition, and the receiving resonant network receives electric energy from the transmitting resonant network, and the electric energy passes through the rectifier circuit, converts AC current into DC current output, and charges the load to be charged powered by. 2. The wireless charging assembly according to claim 1, wherein the wireless charging assembly includes at least one wireless charging receiving coil, and at least one wireless charging receiving circuit; The number of the wireless charging receiving coils is equal to the number of the wireless charging receiving circuits. 3. The wireless charging assembly according to claim 1, wherein the wireless charging assembly further comprises: a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network; The compensation capacitor is connected in series between the first end of the first inductance coil and the first capacitor plate, or the compensation capacitor is connected in series between the second end of the first inductance coil and the second between the capacitor plates; or, The compensation capacitor is connected in series between the first input terminal of the rectifier circuit and the third capacitor plate, or the compensation capacitor is connected in series between the second input terminal of the rectifier circuit and the fourth capacitor plate between the boards, or, the compensation capacitor is connected in parallel between the first input end of the rectification circuit and the second input end of the rectification circuit. 4. A wireless charging receiving coil, characterized in that the wireless charging receiving coil includes: The first inductance coil, the first capacitor plate and the second capacitor plate, the first end of the first inductance coil is electrically connected to the first capacitor plate, and the second end of the first inductance coil is connected to the first capacitor plate. The second capacitor plate is electrically connected; The first capacitor plate is used to form a first capacitor with the third capacitor plate in the wireless charging receiving circuit when the alignment is correct, and the second capacitor plate is used to form a first capacitor with the third capacitor plate in the wireless charging receiving circuit. The four capacitor plates form the second capacitor when the alignment is correct; The correct alignment includes: the facing area of the first capacitive plate and the third capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the second capacitor plate and the fourth capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range; The first inductance coil is used to form a receiving resonant network with the first capacitor and the second capacitor. If the receiving resonant network and the transmitting resonant network meet the magnetic resonance condition, the receiving resonant network will resonate from the transmitting resonant network. The network receives power. 5. The wireless charging receiving coil according to claim 4, wherein the wireless charging receiving coil further comprises: a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network; The compensation capacitor is connected in series between the first end of the first inductance coil and the first capacitor plate, or the compensation capacitor is connected in series between the second end of the first inductance coil and the second between the capacitor plates. 6. A wireless charging receiving circuit, characterized in that the wireless charging receiving circuit comprises: A rectifier circuit, a third capacitor plate and a fourth capacitor plate, the first input terminal of the rectifier circuit is electrically connected to the third capacitor plate, the second input terminal of the rectifier circuit is connected to the fourth capacitor plate plate electrical connection; The third capacitive plate is used to form a first capacitor with the first capacitive plate in the wireless charging receiving coil when the alignment is correct, and the fourth capacitive plate is used to form a first capacitor with the first capacitive plate in the wireless charging receiving coil. The plates of the second capacitor form the second capacitor when the alignment is correct; The correct alignment includes: the facing area of the third capacitive plate and the first capacitive plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range, the first capacitive plate The facing area of the four capacitor plates and the second capacitor plate is within the first preset threshold range and the distance between the plates is within the second preset threshold range; The first capacitor and the second capacitor are used to form a receiving resonant network with the first inductance coil in the wireless charging receiving coil. If the receiving resonant network and the transmitting resonant network meet the magnetic resonance condition, the receiving resonant The network receives electric energy from the transmitting resonant network, and the rectification circuit is used to convert the electric energy from an alternating current to a direct current output to charge and supply the load to be charged. 7. The wireless charging receiving circuit according to claim 6, wherein the wireless charging receiving circuit further comprises: a compensation capacitor, used to adjust the resonant frequency of the receiving resonant network; The compensation capacitor is connected in series between the first input terminal of the rectifier circuit and the third capacitor plate, or the compensation capacitor is connected in series between the second input terminal of the rectifier circuit and the fourth capacitor plate between the boards, or, the compensation capacitor is connected in parallel between the first input end of the rectification circuit and the second input end of the rectification circuit. 8. A wireless charging adapter, characterized in that the wireless charging adapter comprises: One or more wireless charging receiving coils as claimed in claim 4 or 5. 9. The wireless charging adapter according to claim 8, further comprising: a wireless charging transmission source. 10. An electronic device, characterized in that the electronic device comprises: The wireless charging receiving circuit and load as claimed in claim 6 or 7; The output terminal of the rectifier circuit in the wireless charging receiving circuit is electrically connected to the load. 11. A wireless charging system, characterized in that the wireless charging system comprises: The wireless charging adapter as claimed in claim 8, the wireless charging transmission source, and one or more electronic devices as claimed in claim 10; or, A wireless charging adapter as claimed in claim 9 and one or more electronic devices as claimed in claim 10 .