CN111627677A - Wireless charging coil, wireless charging device and winding method of wireless charging coil - Google Patents

Abstract

The utility model discloses a wireless charging coil, which comprises a plurality of coils formed by winding a lead in a spiral shape from inside to outside along the circumferential direction; the wireless charging coil is provided with a plurality of thinned wire areas and non-thinned wire areas which are sequentially and alternately formed along the winding direction of the wires; the width of the thinned wire region is equal to the width of the non-thinned wire region. According to this disclosed wireless charging coil, not only can reduce the impedance value of coil, can also ensure the inductance value of coil, improved wireless efficiency of charging, reduced the loss of coil.

Description

Wireless charging coil, wireless charging device and winding method of wireless charging coil

technical field

The present disclosure relates to the technical field of wireless charging, and in particular, to a wireless charging coil, a wireless charging device and a method for winding a wireless charging coil.

Background technique

With the increasing popularity of electronic products, more and more electronic products use wireless charging devices. The wireless charging device includes a wireless charging coil. The wireless charging coil is used to sense the electromagnetic signal sent by the transmitter, generate alternating current, and transmit the alternating current to the rectifier circuit board; the rectifier circuit board converts the alternating current into direct current to charge the device to be charged.

There are many winding methods for wireless charging coils, for example, including winding type, FPC type, stranded wire type, stamping type, etc. Each method can be divided into many types, such as single-turn, double-turn, multi-turn, etc. Depending on how the coil is wound, the performance of the wireless charging coil structure is also different. With the popularization of wireless charging devices, there is an urgent need for a wireless charging coil structure with excellent performance.

public content

In order to overcome the problems existing in the related art, the present disclosure provides a wireless charging coil, a wireless charging transmitting device, a wireless charging receiving device, a wireless charging device, a terminal device, and a method for winding a wireless charging coil.

According to an embodiment of the present disclosure, there is provided a wireless charging coil, which includes a plurality of coils that are spirally wound from the inside to the outside along a circumferential direction by a wire; the wireless charging coil has a wire along the wire. A plurality of thinned wire areas and non-refined wire areas are alternately formed in winding directions; the width of the thinned wire area is equal to the width of the non-refinement wire area.

In an embodiment of the present disclosure, between two adjacent coils, the thinned wire regions are formed staggered from each other.

In an embodiment of the present disclosure, along the winding direction of the wire, the length of the thinned wire region increases sequentially at a fixed ratio or a non-fixed ratio.

In an embodiment of the present disclosure, the thinned wire area includes a wire and an insulating layer; the non-refined wire area includes a wire and an insulating layer; and the width of the wire in the thinned wire area is smaller than that of the non-refined wire area The width of the wire in the wire area.

In an embodiment of the present disclosure, the thinned wire area includes a first wire and a second wire; the widths of the first wire and the second wire in the thinned wire area are both smaller than those of the non-refinement wire area The width of the wire.

In an embodiment of the present disclosure, the width of the first conductive line in the thinned conductive line region is the same as or different from the width of the second conductive line.

According to a second aspect of the embodiments of the present disclosure, there is provided a wireless charging and transmitting device, comprising: an inverter circuit; and a wireless charging coil connected to an output end of the inverter circuit, the wireless charging coil being the above-mentioned wireless charging coil.

In an embodiment of the present disclosure, the inverter circuit converts the DC power input from the DC power source into AC power, and supplies the AC power to the wireless charging coil; after receiving the AC power, the wireless charging coil converts the AC power to the AC power. The alternating current is emitted in the form of an alternating magnetic field.

According to a third aspect of the embodiments of the present disclosure, there is provided a wireless charging receiving device, including a rectifying circuit; and a wireless charging coil connected to an input end of the rectifying circuit, and the wireless charging coil is the above-mentioned wireless charging coil.

In an embodiment of the present disclosure, the wireless charging coil receives alternating current in an alternating magnetic field, and inputs the alternating current to the input end of the rectifier circuit; the rectifier circuit rectifies the received alternating current for direct current.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a wireless charging apparatus, including: the above wireless charging transmitting apparatus; and the above wireless charging receiving apparatus.

According to a fifth aspect of the embodiments of the present disclosure, there is provided a mobile terminal, comprising: a rectifier circuit; and a wireless charging coil connected to an input end of the rectifier circuit, wherein the wireless charging coil is the above-mentioned wireless charging coil The wireless charging coil receives alternating current in the form of an alternating magnetic field, and inputs the alternating current to the rectifier circuit, which rectifies the alternating current into direct current.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a method for winding a wireless charging coil, comprising: winding a wire in turn from the inside to the outside along a circumferential direction in a spiral shape to form a multi-turn coil; Partial thinning, so as to alternately form a plurality of thinned wire areas and non-refined wire areas along the winding direction of the wire; in the thinned wire area, the width of the thinned wire area is widened, so that all The width of the thinned wire area is the same as the width of the non-fine wire area.

In an embodiment of the present disclosure, when the wire is partially thinned, the thinned wire regions are formed staggered from each other between two adjacent coils.

In an embodiment of the present disclosure, when the wire is partially thinned, along the winding direction of the wire, the length of the thinned wire region is sequentially increased at a fixed ratio or a non-fixed ratio, The thinned wire region is formed.

In an embodiment of the present disclosure, when the wires are partially thinned, the width of the wires in the thinned wire area is smaller than the width of the wires in the non-refinement wire area.

In an embodiment of the present disclosure, the step of widening the width of the wire in the thinned wire area, so that the width of the thinned wire area is the same as the width of the non-refinement wire area, includes: The step of forming a first wire and a second wire in the thinned wire area; the widths of the first wire and the second wire are both smaller than the width of the wire in the non-refinement wire area.

In an embodiment of the present disclosure, the width of the first conductive line in the thinned conductive line region is the same as or different from the width of the second conductive line.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

With the wireless charging coil provided by the present disclosure, a plurality of thinned wire regions are formed along the winding direction of the wire, thereby reducing the impedance value of the coil. The widths of the coils are equal, so that the inductance value of the coil can be guaranteed. Therefore, the skin effect and the eddy current effect can be effectively reduced, the efficiency of wireless charging is significantly improved, and the loss of the coil is reduced.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic structural diagram of a first coil layer of a wireless charging coil according to the prior art.

FIG. 2 is a schematic diagram of charge distribution of wires in a wireless charging coil according to the prior art.

FIG. 3 is a schematic structural diagram of a wireless charging coil according to an embodiment of the present disclosure.

FIG. 4 is an enlarged schematic structural diagram of a wireless charging coil according to an embodiment of the present disclosure.

FIG. 5 is a schematic diagram of charge distribution of wires in a wireless charging coil according to an embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of coil widening in a thin section of a wireless charging coil provided according to an embodiment of the present disclosure.

FIG. 7 is an enlarged schematic structural diagram of a coil widening in a thinned section of a wireless charging coil provided according to an embodiment of the present disclosure.

FIG. 8 is a schematic structural diagram of a wireless charging coil provided according to an embodiment of the present disclosure.

FIG. 9 is a flowchart of a method for winding a wireless charging coil according to an embodiment of the present disclosure.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

FIG. 1 is a schematic structural diagram of a wireless charging coil according to the prior art. FIG. 2 is a schematic diagram of charge distribution of wires in a wireless charging coil according to the prior art.

As shown in FIG. 1 , the wireless charging coil in the prior art is formed by winding a wire 101 . The wire 101 is provided with an insulating layer 102 to avoid direct connection of the wires. The wireless charging coil includes a multi-turn coil formed by winding the wire 101 spirally from the inside to the outside along the circumferential direction. The inner end of the winding wire 101 is the first connection end 1011 , and the outer end of the wire 101 is the second connection end 1012 . The first connection terminal 1011 is led out to the outside through the lead wire so as to be connected with the rectifier circuit board. The multi-turn wire coil has a total of n turns, and n is an integer greater than or equal to 3. The conducting wire 101 is a conducting wire with a uniform radius, so the width of any coil is the same.

When there is alternating current or alternating electromagnetic field in the wire 101, the current distribution inside the wire 101 is uneven, and the current is mainly concentrated on the outer surface of the wire 101. Small. That is, as shown in FIG. 2 , a large amount of charges 121 are accumulated on the surface of the wire 101 , while the charge 12 inside the wire 101 is substantially zero. As a result, the resistance of the wire 101 increases, resulting in an increase in power loss in the charging path of the wireless charging coil. In the field of wireless charging coils, this effect is called the skin effect.

The main reasons for the skin effect are analyzed as follows. In high-frequency circuits, the rate of current change is very large, and the state of uneven distribution is serious. The magnetic field generated by the high-frequency current in the wire induces the largest electromotive force in the central area of the wire. Since the induced electromotive force induces an induced current in a closed circuit, the induced current is greatest at the center of the wire. Because the induced current is in the opposite direction of the original current, it forces the current to be limited to the outer surface of the wire. The main reason for the skin effect is that the changing electromagnetic field produces a vortex electric field inside the conductor, and the vortex electric field cancels out the original current.

As mentioned above, in the wireless charging coils in the prior art, the width of each coil is the same, which is affected by the skin effect. A large amount of current is gathered around each coil, while the internal current is small, resulting in the relative resistance increases.

The present disclosure provides a wireless charging coil winding method, a wireless charging coil structure, a wireless charging transmitting device, a wireless charging receiving device, a wireless charging device and terminal equipment. The wireless charging coil prepared according to the method for winding a wireless charging coil provided in the present disclosure can effectively reduce the resistance while ensuring the inductance value of the wireless charging coil, thereby improving the efficiency of wireless charging and reducing the size of the wireless charging coil. loss. Since the resistance on the wireless charging coil is reduced, the power loss of the wireless charging coil can also be reduced. During the wireless charging process of electronic products such as mobile phones, the heat of the whole machine will be reduced, and the charging time can be further shortened.

The wireless charging coil winding method, wireless charging coil structure, wireless charging transmitting device, wireless charging receiving device, wireless charging device and terminal equipment described in the present disclosure will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a schematic structural diagram of a wireless charging coil according to an embodiment of the present disclosure. FIG. 4 is an enlarged schematic structural diagram of a wireless charging coil according to an embodiment of the present disclosure. FIG. 5 is a schematic diagram of charge distribution of wires in a wireless charging coil according to an embodiment of the present disclosure. FIG. 6 is a schematic structural diagram of coil widening in a thin section of a wireless charging coil provided according to an embodiment of the present disclosure. FIG. 7 is an enlarged schematic structural diagram of a coil widening in a thinned section of a wireless charging coil provided according to an embodiment of the present disclosure. FIG. 8 is a schematic structural diagram of a wireless charging coil provided according to an embodiment of the present disclosure.

As shown in FIG. 3 and FIG. 4 , the wireless charging coil 10 provided by an embodiment of the present disclosure includes a plurality of coils that are spirally wound from the inside to the outside along the circumferential direction of the wire 101 in turn. The wireless charging coil 10 of the present disclosure may further include a magnetic conductive sheet (not shown) formed of ferrite or the like, on which the multi-turn coil wound by the wire 101 may be installed. The material of the wire 101 of the wireless charging coil may be conventional copper alloy wire or aluminum wire, and the present disclosure is not limited thereto. The wires 101 can also be provided with an insulating layer 102 to prevent the wires 101 from being directly connected.

The start end of the wire 101 is the first connection end 1011 , and the end end of the wire 101 is the second connection end 1012 . The first connection terminal 1011 is led out to the outside through the lead wire so as to be connected with the rectifier circuit board. The wire 101 can be wound to form n coils, and n can be an integer greater than or equal to 3.

As shown in FIG. 3 , the wireless charging coil 10 has a thinned wire area 103 and a non-thinned wire area 104 . With the winding direction of the wire 101 , the thinned wire area 103 and the non-thinned wire area 104 alternate with each other in the coil structure. That is, along the winding direction of the wires 101 , a first thinned wire area 103 , a first non-thinned wire area 104 , a second thinned wire area 103 , a second non-thinned wire area 104 , . . . , an Nth wire area are formed. The coil structure of the thinned wire area 103 and the Nth non-thinned wire area 104 . The outermost end of the wire 101 is formed as the second connection end 1012 .

As shown in FIG. 3 and FIG. 4 , the first thinned wire area 103 and the second thinned wire area 104 are formed by dislocation, that is, the first thinned wire area 103 and the second thinned wire area 103 do not overlap; similarly, The second thinned wire area 103 and the third thinned wire area 103 are formed by being displaced, that is, the second thinned wire area 103 and the third thinned wire area 103 do not overlap. In other words, the thinned wire regions 103 of adjacent coils are formed staggered from each other.

The width of the thinned wire region 103 is not limited as long as it is smaller than the width of the wire 101 , and can be 30% or more and 80% or less of the width of the wire 101 , or half the width of the wire 101 . The lengths of the plurality of thinned wire regions 103 may be the same or different. For example, as the wires 101 are wound outward, the length of the second thinned wire region 103 may be greater than that of the first thinned wire region 103 , and the length of the third thinned wire region 103 may be greater than that of the fourth thinned wire region 103 length, and so on. That is, the length of the thinned wire region 103 can be sequentially increased at a fixed ratio or a non-fixed ratio according to the number of winding turns. For example, the length of the thinned wire area 103 formed in the fourth coil may be 20% longer than the length of the thinned wire area 103 formed in the third coil, and the thinned wire area 103 formed in the fifth coil can be 20% longer than the length of the thinned wire region 103 formed in the fourth coil. For another example, the length of the thinned wire area 103 formed in the fourth coil may be 20% longer than the length of the thinned wire area 103 formed in the third coil, and the thinned wire area formed in the fifth coil The length of 103 can be 30% longer than the length of the thinned wire area 103 formed in the fourth coil.

By arranging the wire area 103 of the wireless charging coil 10 to be thin as shown in FIGS. 3 and 4 , the impedance of the wireless charging coil 10 can be reduced.

Compared with the conventional electric charge concentrated on the surface of the wire 101 , as shown in FIG. 5 , by setting the thin wire region 103 , the number of charges inside the wire 101 is significantly increased. That is, the internal current of the wire in the coil increases significantly, thereby effectively reducing the resistance of the wire and effectively reducing the resistance loss of the coil.

However, in order to meet the requirements of charging efficiency and service life, the wireless charging coil also needs to have a sufficient inductance value. However, if the cross-sectional area of the wireless charging coil 10 is reduced, the inductance value of the wireless charging coil 10 may decrease accordingly.

Therefore, as shown in FIGS. 6 , 7 and 8 , in order not to affect the inductance value of the wireless charging coil, in the thinned wire area 103 , the width of the wire 101 is widened, so that the width of the wire 101 is the same as that of the non-refined wire area. same width. For example, if the width of the thinned wire area 103 is half the width of the wire 101, then a wire of the same width can be connected to the thinned wire area 103, so that the width of the thinned wire area 103 and the non-thinned wire area can be 104 are equal in width. The width of the non-thinned wire region 104 is equal to the width of the wire 101 .

For another example, when the width of the thinned wire area 103 is 60% of the width of the wire 101, a wire with a width of 40% of the width of the wire 101 can be connected to the thinned wire area 103, so that the thinning can be achieved. The width of the wire area 103 is equal to the width of the non-refinement wire area 104 .

That is, the thinned wire area 103 may include a first wire and a second wire, and the first wire and the second wire may be wires with the same width, or may be wires with different widths. The widths of the first conductive lines and the second conductive lines are both smaller than the widths of the conductive lines in the non-refinement conductive line region. As long as the width of the thinned wire region 103 is the same as the width of the non-thinned wire region 104 .

Regarding the method of widening and thinning the conducting wire region 103, it is not limited to connecting another conducting wire 101, but also connecting a second conducting wire, and also connecting a third conducting wire. As another embodiment, the width of the thinned wire region 103 can also be increased by increasing the width of the insulating layer 102 . For example, when the width of the wires in the thinned wire area 103 is half of the width of the non-refined wire area 104 , the width of the insulating layer 102 in the thinned wire area 103 can be increased, so that the thinned wire area 103 and the non-refined wire area 104 can have a wider width. The widths of the regions 104 are the same.

Therefore, it can be ensured that the width of the thinned wire area 103 and the non-refinement wire area 104 is equal to the width of the wire 101 , which ensures the uniformity of the width of the wireless charging coil 10 . Therefore, it is ensured that the wireless charging coil 10 has a sufficient inductance value.

In the present disclosure, the thinned wire area 103 is formed in the wireless charging coil, and the width of the thinned wire area 103 is widened, thereby realizing the uniform distribution of electric charges in the wireless charging coil, and effectively reducing the skin effect in the wireless charging coil. The resistance loss caused by the eddy current effect and the eddy current effect can also ensure that the inductance value of the entire coil does not change.

According to the wireless charging coil provided by the present disclosure, while ensuring the inductance value of the wireless charging coil, the resistance can be effectively reduced, thereby improving the efficiency of wireless charging and reducing the loss on the wireless charging coil. Since the resistance on the wireless charging coil is reduced, the power loss of the wireless charging coil can also be reduced. During the wireless charging process of electronic products such as mobile phones, the heat of the whole machine will be reduced, and the charging time can be further shortened.

Embodiments of the present disclosure further provide a wireless charging and transmitting device, which includes an inverter circuit and a wireless charging coil connected to an output end of the inverter circuit. AC power is supplied to the wireless charging coil. After the wireless charging coil receives the alternating current, it transmits the alternating current in the form of an alternating magnetic field.

According to the wireless charging transmitting device provided by the present disclosure, while ensuring the inductance value of the wireless charging coil, the resistance can be effectively reduced, the efficiency of the wireless charging can be improved, the loss on the wireless charging coil can be reduced, and the application of the wireless charging can be reduced. The heating of the electronic equipment of the transmitting device can further shorten the charging time.

Embodiments of the present disclosure further provide a wireless charging receiving device, which includes a rectifier circuit and a wireless charging coil connected to an input end of the rectifier circuit. The wireless charging coil receives alternating current in the form of an alternating magnetic field, and inputs the alternating current to the input of the rectifier circuit. At the terminal, the rectifier circuit that receives the alternating current rectifies the alternating current into direct current and outputs it.

According to the wireless charging receiving device provided by the present disclosure, while ensuring the inductance value of the wireless charging coil, the resistance can be effectively reduced, the efficiency of wireless charging can be improved, the loss on the wireless charging coil can be reduced, and the application of the wireless charging can be reduced. The heating of the electronic equipment of the receiving device can further shorten the charging time.

Embodiments of the present disclosure further provide a wireless charging device, including the above-mentioned wireless charging transmitting device and wireless charging receiving device. According to the wireless charging device provided by the present disclosure, while ensuring the inductance value of the wireless charging coil, the resistance can be effectively reduced, the efficiency of wireless charging can be improved, the loss on the wireless charging coil can be reduced, and the application of the wireless charging receiver can be reduced. The heating of the electronic equipment of the device can further shorten the charging time.

An embodiment of the present disclosure further provides a mobile terminal, including a rectifier circuit and a wireless charging coil connected to an input end of the rectifier circuit. The wireless charging coil receives alternating current in an alternating magnetic field, inputs the alternating current to the rectifying circuit, and receives the alternating current. The rectifier circuit rectifies alternating current to direct current.

According to the mobile terminal provided by the present disclosure, when wireless charging is performed, the heat generation of the mobile terminal can be reduced, and the charging time can be further shortened.

The winding method of the wireless charging coil provided by an embodiment of the present disclosure will be described in detail below. FIG. 9 is a flowchart of a method for winding a wireless charging coil according to an embodiment of the present disclosure.

As shown in FIG. 9 , a method for winding a wireless charging coil provided according to an embodiment of the present disclosure includes step S10 , step S20 and step S30 . Steps S10 to S30 will be introduced separately below.

In step S10, taking the inner first connection end 1011 as a starting point, the wire 101 is wound spirally from the inside to the outside along the circumferential direction to form multiple coils;

In step S20, after the second coil, the wire is partially thinned, so as to alternately form a plurality of thinned wire regions and non-thinned wire regions along the winding direction of the wire;

In step S30, in the thinned wire area, the width of the wire 101 is widened, so that the width of the thinned wire area is the same as the width of the non-refinement wire area.

In step S20 , by partially thinning the wires 101 , alternating coil structures of thinned wire regions and non-refined wire regions are formed. That is, along the winding direction of the wires 101 , a first thinned wire area, a first non-refined wire area, a second thinned wire area, a second non-refined wire area, . . . , an Nth thinned wire area are formed , the coil structure of the Nth non-refinement wire area. The outermost end of the wire 101 is formed as the second connection end 1012 .

When the wire 101 is partially thinned to form a thinned wire area, the first thinned wire area and the second thinned wire area are formed by dislocation, that is, the first thinned wire area and the second thinned wire area do not overlap ; Similarly, the second thinned wire area and the third thinned wire area are formed by dislocation, that is, the second thinned wire area and the third thinned wire area do not overlap. In other words, when the wire 101 is partially thinned to form thinned wire regions, the thinned wire regions of adjacent coils are spaced apart from each other.

The width of the thinned wire area is not limited as long as it is smaller than the width of the wire 101 , and may be 30% or more and 80% or less of the width of the wire 101 . The lengths of the thinned wire regions can be the same or different. For example, with outward winding, the length of the second thinned wire region may be greater than the first thinned wire region, the third thinned wire region may be greater than the fourth thinned wire region, and so on. That is, the length of the thinned wire area can be sequentially increased in a fixed ratio or a non-fixed ratio according to the number of winding turns. For example, the length of the thinned wire area formed in the fourth coil may be 20% longer than the length of the thinned wire area formed in the third coil, and the length of the thinned wire area formed in the fifth coil, It may be 20% longer than the length of the thinned wire region formed in the fourth turn of the coil. For another example, the length of the thinned wire area formed in the fourth coil may be 20% longer than the length of the thinned wire area formed in the third coil, and the length of the thinned wire area formed in the fifth coil , which can be 30% longer than the length of the thinned wire region formed in the fourth coil.

The wireless charging coil manufactured according to the above-mentioned wireless charging coil winding method of the present disclosure can effectively reduce the resistance value and effectively reduce the resistance loss of the coil by forming a thin wire area, and the current passing through the wire is evenly divided, and the heat generated is reduced.

It should be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects are an "or" relationship. The singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

It is further understood that the terms "first", "second", etc. are used to describe various information, but the information should not be limited to these terms. These terms are only used to distinguish the same type of information from one another, and do not imply a particular order or level of importance. In fact, the expressions "first", "second" etc. are used completely interchangeably. For example, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information, without departing from the scope of the present disclosure.

It can be further understood that, unless otherwise specified, "connection" includes direct connection between the two without other components, and also includes indirect connection between the two with other components.

It can be further understood that in the following description, the concepts of "up", "down", "left", "right", "inside", "outside", "front" and "rear" are relative to the diagrams The relative positional relationship given by the embodiment for convenience of description may be changed correspondingly with the change of the positional relationship.

The foregoing description of the implementation of the present disclosure has been presented for the purposes of example and description. The foregoing description is not intended to be exhaustive nor to limit the present disclosure to the precise forms disclosed, and various variations and modifications are possible in light of the above teachings or may be obtained from practice of the present disclosure. The embodiments were chosen and described in order to explain the principles of the disclosure and its practical application to enable others skilled in the art to utilize the disclosure in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims (18)

1. A wireless charging coil, characterized in that it comprises a multi-turn coil formed by a wire wound spirally in turn from the inside to the outside along the circumferential direction; The wireless charging coil has a plurality of thinned wire regions and non-thinned wire regions which are alternately formed along the winding direction of the wire; The width of the thinned wire area is equal to the width of the non-fine wire area. 2. The wireless charging coil according to claim 1, characterized in that, Between two adjacent coils, the thinned wire regions are formed staggered from each other. 3. The wireless charging coil according to claim 1, wherein, Along the winding direction of the wires, the lengths of the thinned wire regions are sequentially increased in a fixed ratio or a non-fixed ratio. 4. The wireless charging coil according to claim 1, wherein, The thinned wire area includes a wire and an insulating layer; the non-refinement wire area includes a wire and an insulating layer; The width of the wires in the thinned wire region is smaller than the width of the wires in the non-thinned wire region. 5. The wireless charging coil according to claim 1, wherein, the thinned wire area includes a first wire and a second wire; The widths of the first wires and the second wires in the thinned wire area are both smaller than the widths of the wires in the non-fine wire area. 6. The wireless charging coil according to claim 5, wherein, The width of the first conductive line in the thinned conductive line region is the same as or different from the width of the second conductive line. 7. A wireless charging transmitting device, characterized in that, comprising: an inverter circuit; and The wireless charging coil is connected with the output end of the inverter circuit, The wireless charging coil is the wireless charging coil according to any one of claims 1 to 6 . 8. The wireless charging and transmitting device according to claim 7, wherein, The inverter circuit converts the DC power input from the DC power source into AC power, and supplies the AC power to the wireless charging coil; After receiving the alternating current, the wireless charging coil transmits the alternating current in the form of an alternating magnetic field. 9. A wireless charging receiving device, comprising: rectifier circuits; and The wireless charging coil is connected with the input end of the rectifier circuit, The wireless charging coil is the wireless charging coil according to any one of claims 1 to 6 . 10. The wireless charging receiving device according to claim 9, wherein, The wireless charging coil receives alternating current in the form of an alternating magnetic field, and inputs the alternating current to the input end of the rectifier circuit; The rectifying circuit rectifies the received alternating current into direct current. 11. A wireless charging device, comprising: A wireless charging and transmitting device, the wireless charging and transmitting device is the wireless charging and transmitting device according to claim 7 or 8; and A wireless charging receiving device, the wireless charging receiving device is the wireless charging receiving device according to claim 9 or 10. 12. A mobile terminal, comprising: rectifier circuits; and a wireless charging coil connected to the input end of the rectifier circuit, the wireless charging coil being the wireless charging coil according to any one of claims 1 to 6; The wireless charging coil receives alternating current in the form of an alternating magnetic field, and inputs the alternating current to the rectifier circuit, which rectifies the alternating current into direct current. 13. A method for winding a wireless charging coil, comprising: The steps of winding the wire in turn from the inside to the outside in a spiral shape along the circumferential direction to form multiple coils; Partially thinning the wire, so as to alternately form a plurality of thinned wire regions and non-thinned wire regions along the winding direction of the wire; In the thinned wire area, the width of the thinned wire area is widened so that the width of the thinned wire area is the same as the width of the non-refinement wire area. 14. The method for winding a wireless charging coil according to claim 13, wherein, When the wire is partially thinned, the thinned wire regions are formed staggered from each other between two adjacent coils. 15. The method for winding a wireless charging coil according to claim 13, wherein, When the wire is partially thinned, along the winding direction of the wire, the thinned wire area is formed in a manner that the length of the thinned wire area is sequentially increased in a fixed ratio or a non-fixed ratio. 16. The method for winding a wireless charging coil according to claim 13, wherein, When the wires are partially thinned, the width of the wires in the thinned wire area is smaller than the width of the wires in the non-refinement wire area. 17 . The method for winding a wireless charging coil according to claim 13 , wherein, in the thinned wire area, the width of the wire is widened, so that the width of the thinned wire area is the same as that of the non-contact wire. 18 . The same steps for thinning the width of the wire area include: the step of forming a first wire and a second wire in the thinned wire area; The widths of the first conductive lines and the second conductive lines are both smaller than the widths of the conductive lines in the non-refinement conductive line region. 18. The method for winding a wireless charging coil according to claim 17, wherein, The width of the first conductive line in the thinned conductive line region is the same as or different from the width of the second conductive line.

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