A coil module and electronic device

Abstract

The application relates to a coil module and an electronic device, and belongs to the technical field of wireless charging. The coil module comprises a wireless charging coil, a connecting part and an adjusting part. The wireless charging coil comprises an inner end and an outer end, and the inner end is connected with the connecting part. The adjusting part comprises a capacitor connected in series between the outer end and the connecting part, and is used for adjusting the inductance value of the wireless charging coil. The coil module adjusts the inductance value of the wireless charging coil through the adjusting part, adjusts the matching of the circuit, reduces the energy loss of the whole wireless charging device, improves the wireless charging conversion efficiency, and makes the coil module more competitive in application.

Description

TECHNICAL FIELD

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

[0002] Wireless charging technology is derived from wireless power transmission technology. With the continuous development of mobile devices, most mobile devices have wireless charging (Wireless Power Charge, WPC for short) function.

[0003] In the wireless charging process, the charger and the power device transmit energy through a magnetic field, and there is no wire connection between the two, so the charger and the power device can be exposed without conductive contacts. Wireless charging can provide the advantages of high power, high efficiency, high safety and water resistance. It can be applied to furniture, cars, mobile phones, wireless wearable products, medical treatment, industrial power supply and other fields. Compared with traditional plug-in contact charging, it has obvious advantages in water safety.

[0004] Near Field Communication (NFC for short) can exchange data when close to each other, and is derived from the integration and evolution of non-contact radio frequency identification (RFID) and interconnection technology. By integrating an inductive reader, an inductive card and a point-to-point communication function on a single chip, mobile payment, electronic ticketing, access control, mobile identity recognition, anti-counterfeiting and other applications can be realized using mobile terminals.

[0005] With the demand for the widespread application of wireless charging and NFC, WPC and NFC have almost become standard configurations for handheld intelligent terminals. Due to the limited space of current mobile phones, how to reduce the space occupation of the two and ensure the conversion efficiency of wireless charging has become a problem to be solved. SUMMARY

[0006] In order to solve the technical problem of improving the conversion efficiency of wireless charging, the present application provides a coil module and an electronic device.

[0007] In a first aspect, the present application provides a coil module, which comprises: a wireless charging coil, a connecting part and an adjusting part.

[0008] The wireless charging coil comprises an inner end and an outer end, and the inner end is connected with the connecting part.

[0009] The adjusting part comprises a capacitor device connected in series between the outer end and the connecting part, for adjusting the inductance value of the wireless charging coil.

[0010] Optionally, a plurality of said outer ends are arranged side by side, and said adjusting part comprises N capacitor devices corresponding to said outer ends one by one;

[0011] Optionally, said N is 4, and said N capacitor devices comprise a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; and said outer ends comprise a first outer end, a second outer end, a third outer end and a fourth outer end;

[0012] A first end of said first capacitor is connected to said first outer end; a first end of said second capacitor is connected to said second outer end; a first end of said third capacitor is connected to said third outer end; and a first end of said fourth capacitor is connected to said fourth outer end;

[0013] A second end of said first capacitor, a second end of said second capacitor, a second end of said third capacitor and a second end of said fourth capacitor are commonly connected to a fourth port of said connecting part;

[0014] Optionally, said first outer end is also connected to a fifth port of said connecting part, for shunting current of said wireless charging coil;

[0015] Optionally, said first outer end is connected to a first end of said first capacitor through a first conductive line; said second outer end is connected to a first end of said second capacitor through a second conductive line; said third outer end is connected to a first end of said third capacitor through a third conductive line; and said fourth outer end is connected to a first end of said fourth capacitor through a fourth conductive line;

[0016] A second end of said first capacitor, a second end of said second capacitor, a second end of said third capacitor and a second end of said fourth capacitor are commonly connected to said fourth port through a fifth conductive line;

[0017] Said first outer end is connected to said fifth port through a sixth conductive line;

[0018] Said first conductive line, said second conductive line, said third conductive line and said fourth conductive line are electrically insulated from each other;

[0019] Said fifth conductive line and said sixth conductive line are electrically insulated from each other;

[0020] Optionally, said coil module further comprises a near field communication coil, a first end of said near field communication coil is connected to a first port of said connecting part, and a second end of said near field communication coil is connected to a second port of said connecting part;

[0021] Optionally, said near field communication coil, said connecting part and said adjusting part are arranged on a same flexible circuit board;

[0022] Optionally, the coil module further comprises a magnetic material and a fixing unit.

[0023] The magnetic material comprises nanocrystals or ferrite.

[0024] The fixing unit fixes the wireless charging coil and the near field communication coil to the magnetic material.

[0025] In a second aspect, the present application provides an electronic device comprising the coil module of any one of the first aspect.

[0026] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0027] The coil module provided by the embodiments of the present application comprises a wireless charging coil, a connecting part and an adjusting part. The wireless charging coil comprises an inner end and an outer end, and the inner end is connected to the connecting part. The adjusting part comprises a capacitor connected in series between the outer end and the connecting part, and is used for adjusting the inductance value of the wireless charging coil. The coil module adjusts the inductance value of the wireless charging coil through the adjusting part to adjust the matching of the circuit, which can reduce the energy loss of the entire wireless charging device, thereby improving the wireless charging conversion efficiency and making the coil module more competitive in application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application together with the specification.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without creative effort.

[0030] Figure 1 A structural schematic diagram of a coil module provided by an embodiment of the present application;

[0031] Figure 2 A schematic diagram of a coil module provided by an embodiment of the present application;

[0032] Figure 3 A sectional schematic diagram of a coil copper wire in a coil module provided by an embodiment of the present application;

[0033] Figure 4 A schematic diagram of a wireless charging coil in a coil module provided by an embodiment of the present application;

[0034] Figure 5A schematic view of NFC and WPC sharing FPC in a coil module is provided for an embodiment of the present application.

[0035] Figure 6 A schematic view of a connection part, an adjusting part and a wireless charging coil of a coil module is provided for an embodiment of the present application.

[0036] Figure 7 An exploded schematic view of a coil module is provided for an embodiment of the present application.

[0037] The reference signs are as follows:

[0038] 101-wireless charging coil; 102-adjusting part; 103-connection part;

[0039] N1-inner end; Y1-first outer end; Y2-second outer end; Y3-third outer end; Y4-fourth outer end;

[0040] C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor;

[0041] A1-first port; A2-second port; A3-third port; A4-fourth port; A5-fifth port;

[0042] 501-near field communication coil; 701-magnetic material; 702-fixing unit. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, 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 a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] The first embodiment of the present application provides a coil module, such as Figure 1 The coil module includes a wireless charging coil 101, a connection part 103 and an adjusting part 102.

[0045] The wireless charging coil 101 is powered through the connection part 103, and the adjusting part 102 is connected in series between the wireless charging coil 101 and the connection part 103, for adjusting the inductance value of the wireless charging coil 101, so that the wireless charging coil 101 meets the electrical performance of the wireless charging module. Specifically, the wireless charging coil 101 includes an inner end and an outer end, the inner end is connected with the connection part 103, and the adjusting part 102 includes a capacitor device connected in series between the outer end and the connection part 103, for adjusting the inductance value of the wireless charging coil 101.

[0046] In the embodiment, the connecting part 103 can be connected with an external power supply by means of plugging, clamping or welding, etc. After connection, the wireless charging coil 101 is powered, the inductance value of the wireless charging coil is adjusted by the adjusting part 102 to adjust the matching of the circuit, the electrical performance of the wireless charging module is met, the energy loss of the whole wireless charging device is reduced, and thus the wireless charging conversion efficiency is improved, and the coil module is more competitive in application.

[0047] In the embodiment, the adjusting part 102 includes a capacitor device. The capacitor device and the wireless charging coil can form an LC oscillation circuit, which can also be called an LC resonance circuit, a slot circuit or a tuning circuit, etc. The LC oscillation circuit is used to generate a signal of a specific frequency, and is also used to separate a signal of a specific frequency from a more complex signal. Therefore, the inductance value of the wireless charging coil can be adjusted by the capacitor device, and thus the electrical performance of the wireless charging module (i.e. the WPC module) is met. It can be understood that the adjusting part can also be other devices capable of adjusting the wireless charging coil, and the embodiment does not limit this.

[0048] In one embodiment, as shown in Figures 2-5 , wherein, Figure 2 A schematic diagram of a coil module provided by an embodiment of the present application is shown in Figure 3 A schematic diagram of a cross section of a coil copper wire in a coil module provided by an embodiment of the present application is shown in Figure 4 A schematic diagram of a wireless charging coil in a coil module provided by an embodiment of the present application is shown in Figure 5 A schematic diagram of an NFC and WPC shared FPC in a coil module provided by an embodiment of the present application is shown in

[0049] The wireless charging coil is wound by N Litz wires in parallel, the first ends of the N Litz wires are collectively used as an inner end N1, the inner end N1 is connected with a third port A3 of the connecting part 103, and the second ends of the N Litz wires are respectively used as N outer ends. The outer end can be provided with a plurality of outer ends, and the plurality of outer ends can be arranged side by side. The adjusting part includes N capacitor devices, and the capacitor devices correspond one by one to the outer ends.

[0050] The Litz wire refers to a conductor which is twisted or braided by a plurality of independent insulated conductors. In the embodiment, N Litz wires with seven cores are used to wind the wireless charging coil, which can reduce the loss caused by the current passing through the wireless charging coil and improve the utilization rate of electric energy. It should be noted that the type number of the Litz wire can be selected as needed, and the embodiment of the present application does not limit this.

[0051] , wherein N can be one or more. In a specific embodiment, as shown in Figure 6, N can be 4, the N capacitor devices include a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4, and the N outer ends include a first outer end Y1, a second outer end Y2, a third outer end Y3 and a fourth outer end Y4. The specific connection relationship is as follows:

[0052] The first end of the first capacitor C1 is connected to the first outer end Y1, the first end of the second capacitor C2 is connected to the second outer end Y2, the first end of the third capacitor C3 is connected to the third outer end Y3, and the first end of the fourth capacitor C4 is connected to the fourth outer end Y4. The second end of the first capacitor C1, the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are commonly connected to the fourth port A4 of the connecting part 103.

[0053] It should be noted that, Figure 3 The cross-sectional view of the four seven-core Litz wires is shown, and different numbers of Litz wires and types of Litz wires can be selected according to needs in actual application, and the embodiments of the present application are not limited.

[0054] By setting the same number of capacitor devices as the outer ends of the wireless charging coil, the eddy current loss of each Litz wire of the wireless charging coil can be reduced, thereby improving the energy conversion efficiency of wireless charging.

[0055] Optionally, the first outer end Y1 can also be connected to the fifth port A5 of the connecting part 103, for shunting the current of the wireless charging coil. In order to facilitate the design of the flexible circuit board, the first outer end Y1 can be the port close to the edge among the four outer ends, and the first outer end Y1 is divided into two paths, one path passes through the first capacitor C1 to reduce energy loss, and the other path is connected to the fifth port A5 of the connecting part 103 to shunt when the current is large, thereby improving the safety performance of the circuit.

[0056] It should be noted that N is 4 in the embodiment, and four capacitor devices are provided, which is a specific scheme selected by considering space occupation and energy conversion efficiency, and N can also be other values, and the embodiments of the present application are not limited. The first port A1, the second port A2, the third port A3, the fourth port A4 and the fifth port A5 of the connecting part can be connecting fingers, which can be inserted into the slots in other components, facilitating use.

[0057] In one embodiment, the coil module further comprises a near field communication coil 501, a first end of the near field communication coil 501 is connected with the first port A1 of the connecting part 103, and a second end of the near field communication coil 501 is connected with the second port A2 of the connecting part 103. Since most terminals currently have the demand of simultaneously including WPC and NFC functions, in the embodiment, the coil module further comprises the near field communication coil 501, and the near field communication coil 501 transmits signals through the first port A1 and the second port A2 of the connecting part 103.

[0058] The embodiment can reduce the space occupation by designing the wireless charging coil 101 and the near field communication coil 501 into the same coil module, can reduce the volume of the terminal applying the coil module or leave enough space for other devices, and enrich the functions of the terminal.

[0059] In order to further reduce the space occupation, the near field communication coil 501, the connecting part 103 and the adjusting part 102 can be arranged on the flexible circuit board together, so that the space occupation can be more reasonably optimized.

[0060] In the flexible circuit board, for example, Figure 6 The outer end of the wireless charging coil 101 and the capacitor device can be connected through the conductive circuit in the flexible circuit board, and the specific connection can be as follows:

[0061] The first outer end Y1 is connected with the first end of the first capacitor C1 through the first conductive circuit, the second outer end Y2 is connected with the first end of the second capacitor C2 through the second conductive circuit, the third outer end Y3 is connected with the first end of the third capacitor C3 through the third conductive circuit, and the fourth outer end Y4 is connected with the first end of the fourth capacitor C4 through the fourth conductive circuit.

[0062] The second end of the first capacitor C1, the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are connected with the fourth port A4 through the fifth conductive circuit, the first outer end Y1 is connected with the fifth port A5 through the sixth conductive circuit, the first conductive circuit, the second conductive circuit, the third conductive circuit and the fourth conductive circuit are electrically insulated from each other, and the fifth conductive circuit and the sixth conductive circuit are electrically insulated from each other.

[0063] Reserve connection points matched with the outer end in the flexible circuit board to facilitate the connection of the inner end and the outer end of the wireless charging coil 101 with the flexible circuit board.

[0064] In one embodiment, the coil module further comprises a magnetic material 701 and a fixing unit 702, for example, Figure 7The magnetic material 701 is used to shield the electric signal of the wireless charging coil 101, isolate the metal influence, and make the wireless charging coil 101 have a better shielding effect. The magnetic material 701 can be nanocrystalline or ferrite, and the embodiments of the present application are not limited in this regard. The fixing unit is a colloid, and the fixing unit 702 fixes the relative positions between the wireless charging coil 101, the near field communication coil 501, and the magnetic material 701.

[0065] In the embodiment, the wireless charging coil 101 generates electromagnetic interference (EMI) when working, and the magnetic material can reduce the EMI frequency without affecting the charging.

[0066] The fixing unit 702 can fix the wireless charging coil 101, the near field communication coil 501, and the nanocrystalline (or ferrite) together to avoid displacement during work and affect the function. The fixing unit 702 can be double-sided tape. The wireless charging coil 101 and the near field communication coil 501 are fixed to the nanocrystalline, and then the whole is fixed to the terminal to be applied, so that the position fixing can be easily realized.

[0067] Of course, the near field communication coil 501, the adjusting part 102, and the connecting part 103 can be arranged on the same flexible circuit board. After the inner end and each outer end of the wireless charging coil 101 are connected to the flexible circuit board, the fixing unit 702 is used to fix the flexible circuit board, the wireless charging coil 101, and the magnetic material 701.

[0068] Table 1 shows the comparison of the electrical performance of the conventional scheme and the embodiment of the present application. It can be seen that the embodiment of the present application has a higher inductance (Ls) and a lower resistance (Rs) than the conventional scheme, which can improve the charging efficiency of the entire wireless charging module, reduce the loss, and thus reduce the heat generation, and improve the performance of the terminal applying the wireless charging module.

[0069] Table 1

[0070]

[0071] Based on the same technical concept, the second embodiment of the present application provides an electronic device comprising the coil module of the first embodiment.

[0072] The electronic device applying any one of the coil modules in the first embodiment has a higher inductance and a lower resistance than the conventional scheme, which can improve the wireless charging efficiency of the electronic device, reduce the energy loss, and thus reduce the heat generation of the electronic device, improve the performance of the electronic device, and further improve the performance of the terminal applying the electronic device.

[0073] It should be noted that the electronic device can be a module capable of wireless charging or a module containing the module, or a terminal device containing the module, etc. The terminal device can be a mobile terminal or a smart terminal. The mobile terminal can be at least one of a mobile phone, a tablet computer, a notebook computer, etc. The smart terminal can be a terminal containing a wireless charging module, and the embodiments of the present application are not limited.

[0074] It should be noted that in this document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0075] It should be understood that the specific embodiments described herein merely serve to explain the present application and are not intended to limit the present application. In the description, the suffixes such as "module", "part", or "unit" used to represent elements are merely for the convenience of explanation of the present application, and have no specific meaning by themselves. Therefore, "module", "part", or "unit" can be used interchangeably.

[0076] In the embodiments of the present application, "a plurality of" can mean two or more, and "at least one" can mean one, two, or more. It should also be understood that, for any component, data, or structure mentioned in the embodiments of the present application, one or more can be understood in general, unless specifically limited or the context gives a contrary implication.

[0077] It should also be understood that the description of the embodiments of the present application emphasizes the differences between the embodiments, and the same or similar parts can be referred to each other, and for the sake of brevity, will not be repeated. The technologies, methods, and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the technologies, methods, and devices should be considered as part of the specification.

[0078] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0079] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and it is intended to embrace all such modifications and changes that fall within the scope of the application. Accordingly, the application is not to be restricted in scope to the specific embodiments disclosed herein but is to be accorded the full scope that the principles and novel features request appropriately granted.

Claims

1. A coil module, characterized in that, The coil module includes: a wireless charging coil, a connecting part, and an adjustment part; The wireless charging coil includes an inner end and an outer end, and the inner end is connected to the connecting part. The adjustment unit includes a capacitor connected in series between the outer end and the connecting part, for adjusting the inductance value of the wireless charging coil; The outer ends are arranged in a row of multiple units, and the adjustment part includes N capacitors, each capacitor corresponding to one of the outer ends. Wherein, N is 4, and the N capacitors include a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; the outer end includes a first outer end, a second outer end, a third outer end, and a fourth outer end; The first terminal of the first capacitor is connected to the first external terminal; the first terminal of the second capacitor is connected to the second external terminal; the first terminal of the third capacitor is connected to the third external terminal; and the first terminal of the fourth capacitor is connected to the fourth external terminal. The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, and the second terminal of the fourth capacitor are all connected to the fourth port of the connection part.

2. The coil module according to claim 1, characterized in that, The first outer end is also connected to the fifth port of the connecting part, which is used to shunt the current of the wireless charging coil.

3. The coil module according to claim 2, characterized in that, The first outer end is connected to the first terminal of the first capacitor via a first conductive line; the second outer end is connected to the first terminal of the second capacitor via a second conductive line; the third outer end is connected to the first terminal of the third capacitor via a third conductive line; and the fourth outer end is connected to the first terminal of the fourth capacitor via a fourth conductive line. The second terminals of the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are all connected to the fourth port through a fifth conductive line; The first outer end is connected to the fifth port via a sixth conductive line; The first conductive line, the second conductive line, the third conductive line, and the fourth conductive line are all electrically insulated from each other; The fifth conductive line and the sixth conductive line are electrically insulated from each other.

4. The coil module according to claim 1, characterized in that, The coil module also includes a near-field communication coil, the first end of which is connected to the first port of the connection part, and the second end of which is connected to the second port of the connection part.

5. The coil module according to claim 4, characterized in that, The near-field communication coil, the connecting part, and the adjusting part are disposed on the same flexible circuit board.

6. The coil module according to claim 4, characterized in that, The coil module also includes magnetic materials and a fixing unit; The magnetic material includes nanocrystals or ferrites; The fixing unit fixes the wireless charging coil and the near-field communication coil to the magnetic material.

7. An electronic device, characterized in that, Includes the coil module as described in any one of claims 1-6.

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