A wireless charging module, a wireless charging device and a system

Abstract

This application provides a wireless charging module, including a multi-wire parallel-wound coil 501, which is constructed by winding multiple wires side by side. At least two wires in the multi-wire parallel-wound coil 501 are connected to a target structure 502. The target structure 502 is equivalent to a negatively coupled inductor, and the target structure 502 is either a structure formed by a local structure of the two wires or a structure independent of the two wires. This application can connect a negatively coupled inductor in the inter-wire loop of the multi-wire parallel-wound coil 501 to increase the loop impedance, thereby suppressing the loop current and solving the problems of additional losses and uneven heat distribution caused by the circulating current in the multi-wire parallel-wound coil 501.

Description

A wireless charging module, wireless charging device and system Technical Field

[0001] The embodiments of the present application relate to the fields of electronic devices and wireless charging, and more specifically, to wireless charging modules, wireless charging devices, and systems. Background Art

[0002] A wireless charging receiving device can be placed near a wireless charging transmitting device to form a wireless charging system. The wireless charging transmitting device can emit a varying magnetic field via its transmitting coil. The receiving coil of the wireless charging receiving device can couple with the transmitting coil of the wireless charging transmitting device, allowing the wireless charging receiving device to receive the varying magnetic field from the wireless charging transmitting device via the receiving coil. The varying magnetic field emitted by the transmitting coil induces a current in the receiving coil, allowing the wireless charging receiving device to draw power from the wireless charging transmitting device.

[0003] In wireless charging systems, using coils wound with multiple wires, bundles, or strands can flexibly increase the coil's current-carrying capacity to meet diverse application requirements. However, due to the skin effect and proximity effect at high frequencies, the currents flowing through each wire are inconsistent, resulting in a lower Q factor than a single-wire coil of the same size, hindering system efficiency.

[0004] Summary of the Invention

[0005] In a first aspect, the present application provides a wireless charging module, comprising: a multi-wire parallel-wound coil 501, wherein the multi-wire parallel-wound coil 501 is formed by winding multiple wires in parallel; wherein a target structure 502 is connected between at least two wires in the multi-wire parallel-wound coil 501; the target structure 502 is equivalent to a negative coupling inductor, and the target structure 502 is a structure formed by the local structure of the two wires or a structure independent of the two wires.

[0006] In an embodiment of the present application, a negative coupling inductor can be connected in the inter-wire loop of the multi-wire parallel coil 501 to increase the loop impedance, thereby suppressing the loop current, and solving the problems of additional loss and uneven heat distribution caused by the existence of circulating current in the multi-wire parallel coil 501.

[0007] The wire can be wound to form sub-coils.

[0008] In a possible implementation, the target structure 502 is connected between each wire and at least one other wire in the multi-wire coil 501 .

[0009] When the negative coupling inductance is large enough, a good circulating current suppression effect can be achieved by connecting at least one set of negative coupling inductors between each wire and other wires. In this case, at least N-1 sets of negative coupling inductors are required, that is, there is no need to set negative coupling inductors between any two wires in the multi-wire parallel coil 501, thereby reducing costs.

[0010] In a possible implementation, the target structure 502 is connected between any two wires in the multi-wire coil 501 .

[0011] Ideally, a set of negative coupling inductors is connected between any two wires. N wires wound in parallel around the coil 501 require a total of N·(N-1) / 2 sets of negative coupling inductors. This maximizes the loop impedance and achieves better circulating current suppression.

[0012] In a possible implementation, the at least two wires include a first wire and a second wire; the target structure 502 includes a magnetic ring 503, and the outlet ends of the first wire and the second wire on the same side are wound around the magnetic ring 503 in opposite winding directions.

[0013] In this way, the added negative coupling inductor can be formed by the outgoing wire of the coil 501 and the magnetic ring 503, and the outgoing wire of the coil 501 is reused as the negative coupling inductor winding, thereby realizing a negative coupling inductor with a high Q value at a low cost.

[0014] In one possible implementation, the at least two wires include a first wire and a second wire; the target structure 502 includes a circuit board substrate and a magnetic ring, the circuit board substrate includes a first hole 1106, a second hole 1107, a first wire 1102 wrapped around the first hole 1106, and a second wire 1103 wrapped around the second hole 1107, the magnetic ring passes through the first hole 1106 and the second hole 1107, the outlet end of the first wire is connected to the first wire 1102, and the outlet end of the second wire is connected to the second wire 1103.

[0015] In one possible implementation, the multi-wire parallel coil 501 is attached to a magnetic core, and the magnetic ring includes a first magnetic core portion 1104 and a C-shaped or E-shaped second magnetic core portion 1105, the first magnetic core portion 1104 belongs to the magnetic core, and the second magnetic core portion 1105 is buckled on the first magnetic core portion 1104 and passes through the first hole 1106 and the second hole 1107.

[0016] In a possible implementation, the at least two wires include a first wire and a second wire; the target structure 502 includes a circuit board substrate 1101, a first magnetic core portion 1104 and an E-shaped second magnetic core portion 1105; wherein,

[0017] The circuit board substrate includes a third hole 1108, a first wire 1102 and a second wire 1103 wound around the third hole 1108, wherein the first wire 1102 and the second wire 1103 are on different layers of the circuit board substrate 1101, the middle protrusion of the second magnetic core portion 1105 passes through the third hole 1108, the outlet end of the first wire is connected to the first wire 1102, and the outlet end of the second wire is connected to the second wire 1103; the first magnetic core portion 1104 belongs to the magnetic core, and the second magnetic core portion 1105 is buckled on the first magnetic core portion 1104 and passes through the third hole 1108.

[0018] In a possible implementation, the circuit board substrate further includes a fourth hole 1109 and a fifth hole 1110 , and the protrusions on both sides of the second magnetic core portion 1105 pass through the fourth hole 1109 and the fifth hole 1110 , respectively.

[0019] In a possible implementation, the protrusions on both sides of the second magnetic core portion 1105 pass through both sides of the circuit board substrate and are buckled onto the first magnetic core portion 1104 .

[0020] Among them, the first magnetic core portion 1104 and the second magnetic core portion 1105 can be but are not limited to C-type combined with I-type, C-type combined with C-type, E-type combined with I-type, E-type combined with E-type, or pot-shaped, etc. When using E-type or pot-shaped magnetic cores, the first wire 1102 and the second wire 1103 can be wound around the same hole.

[0021] To save costs, the coil has a magnetic core on the back, and the negatively coupled inductor also requires a magnetic core. Therefore, the magnetic core portions of the two can be reused to improve overall integration, reduce volume and cost. Therefore, the magnetic ring used can include a first magnetic core portion 1104 and a C-shaped or E-shaped second magnetic core portion 1105. For example, the first magnetic core portion 1104 can be I-shaped, and the first magnetic core portion 1104 belongs to the magnetic core. The second magnetic core portion 1105 is buckled on the first magnetic core portion 1104 and passes through the first hole 1106 and the second hole 1107.

[0022] In a possible implementation, the second magnetic core portion 1105 and the multi-filar coil 501 are located on opposite sides of the magnetic core.

[0023] That is to say, the target structure 502 equivalent to the negative coupling inductance may also be provided on the back side of the magnetic core of the coil, which can make the overall structure more compact.

[0024] In one possible implementation, the at least two wires include a first wire and a second wire; the multi-wire parallel coil 501 is attached to a magnetic core; wherein the target structure 502 is formed by the following structure: the magnetic core is provided with a through hole 1301 at the outlet ends of the first wire and the second wire, the outlet end of the first wire passes through the through hole 1301 and the outlet end of the second wire does not pass through the through hole 1301; or, the magnetic core is provided with multiple through holes 1301 at the outlet ends of the first wire and the second wire, the outlet end of the first wire and the outlet end of the second wire respectively pass through the multiple through holes 1301 in sequence, and the directions of the holes are opposite.

[0025] If there's a magnetic core behind the coil and sufficient space, you can use the coil wires to thread through the slots in the back core to create a negatively coupled inductor. This added negatively coupled inductor can be constructed directly from the coil module and back core, eliminating the need for additional components and helping to reduce cost and size.

[0026] In one possible implementation, the at least two wires include a first wire and a second wire; the first wire includes a first line segment 1401, the second wire includes a second line segment 1402, the first line segment 1401 and the second line segment 1402 are adjacent and arranged side by side, and the currents in the first line segment 1401 and the second line segment 1402 are in opposite directions. The opposite current directions here can be understood as: the effective currents are opposite, and the circulating currents are in the same direction.

[0027] For example, for a multi-wire parallel-wound coil with a magnetic core backplane, when there is ample space in the middle of the coil or on the back of the magnetic core, a negative coupling inductor can be directly wound on the middle of the coil or on the back of the magnetic core, avoiding the introduction of additional devices, helping to reduce costs and size.

[0028] In a possible implementation, the multi-filar coil 501 is attached to a first magnetic core; and a second magnetic core 1501 is covered on the first magnetic core in the area where the first line segment 1401 and the second line segment 1402 are located.

[0029] That is, a magnetic core layer can be further covered on the negative coupling inductor to increase the inductance value.

[0030] In the second aspect, the present application provides a wireless charging module, comprising: a multi-wire parallel coil 501, wherein the multi-wire parallel coil 501 is constructed by winding multiple wires in parallel; wherein, each wire in the multi-wire parallel coil 501 is connected in series with a capacitor, and a compensation inductor is connected in series to the main circuit after the multi-wire parallel coil 501 is connected, and the product of the inductance of the compensation inductor and the total capacitance of the capacitors connected in series on the multi-wire parallel coil 501 is related to the operating frequency or resonant compensation frequency of the coil.

[0031] Among them, when the operating frequency is fixed, the inductance value of the compensation inductor can be determined according to the coil operating frequency. When the operating frequency is not fixed, it can be determined according to the coil resonance compensation frequency.

[0032] In a possible implementation, the capacitances of the capacitors connected in series on different wires in the multi-wire parallel coil 501 are equal.

[0033] In a possible implementation, the product of the inductance of the compensation inductor and the total capacitance of the capacitors connected in series on the multi-wire parallel coil 501 is: 1 / (ω 2 ), where ω is the operating frequency or the resonant compensation angular frequency.

[0034] The embodiment of the present application can increase the inter-line loop capacitive reactance to suppress the loop current. As shown in Figure 16, each wire of the multi-wire parallel coil is connected in series with a capacitor, thereby introducing a large capacitive reactance in any inter-line loop and reducing the inter-line circulating current. Since the series capacitor is also equivalent to connecting a capacitor with a total capacitance value C (C = C1 + C2 + ... + Cn) in series on the effective current loop, in order to avoid or reduce the impact on the impedance characteristics of the effective current loop, a compensation inductor L can be connected in series on the main circuit for compensation. The inductance of the compensation inductor and the total capacitance of the series capacitor satisfy: L = 1 / (ω 2 C), when the operating frequency is fixed, ω can be the operating angular frequency; when the operating frequency is not fixed, ω can be the resonant compensation angular frequency of the coil.

[0035] Through the above method, in the multi-wire parallel-wound coil, the loop capacitance in the multi-wire parallel-wound coil is increased by connecting a capacitor in series with each wire, and the inductor is connected in series with the main circuit to offset the influence of the capacitor in series on the effective current. The capacitor has the advantages of small size and low cost. At the same time, the circulating current suppression capacitor can be reused with the series compensation capacitor, which can improve the problems of circulating current loss and uneven heating of the multi-wire parallel-wound coil at extremely low size and cost.

[0036] In a possible implementation, inductors are connected between different lines.

[0037] In one possible implementation, inductors of equal magnitude are connected between different wires in the multi-wire parallel coil 501. To further enhance the suppression of inter-wire circulating currents, in addition to connecting capacitors in series with the wires, inductors of equal magnitude may be connected between different wires to form an LC band-stop network.

[0038] In a third aspect, the present application provides a wireless charging module, comprising: a multi-wire parallel-wound coil 501, wherein the multi-wire parallel-wound coil 501 is constructed by winding multiple wires in parallel; wherein, each wire in the multi-wire parallel-wound coil 501 is connected in series with an inductor, and a compensation capacitor is connected in series to the main circuit after the multi-wire parallel-wound coil 501 is connected, and the numerical relationship between the capacitance of the compensation capacitor and the inductor connected in series with the multi-wire parallel-wound coil 501 is related to the operating frequency or resonant compensation frequency of the coil.

[0039] In a possible implementation, the inductance values ​​of the inductors connected in series on different wires in the multi-wire coil 501 are equal.

[0040] In a possible implementation, the numerical relationship between the capacitance of the compensation capacitor and the inductance connected in series with the multi-wire parallel coil 501 is: 1 / L1+1 / L2+…+1 / Ln=(ω 2 ·C), where ω is the operating frequency or the resonant compensation angular frequency, C is the capacitance of the compensation capacitor, and · is multiplication.

[0041] In a possible implementation, capacitors are connected between different lines.

[0042] In one possible implementation, capacitors of equal magnitude are connected between different wires in the multi-wire parallel coil 501. To further enhance the suppression of inter-wire circulating currents, in addition to connecting inductors in series with the wires, capacitors of equal magnitude may also be connected between different wires to form an LC band-stop network.

[0043] In a fourth aspect, the present application provides a wireless charging device, comprising a wireless charging module and an energy storage device as described in any one of the first, second or third aspects, wherein the wireless charging module is used as a receiving end of wireless charging; the multi-wire parallel coil 501 included in the wireless charging module is used to receive electrical energy and transmit the electrical energy to the energy storage device.

[0044] In a fifth aspect, the present application provides a wireless charging device, characterized in that it includes a wireless charging module and an energy storage device as described in any one of the first, second or third aspects, wherein the wireless charging module is used as a transmitting end of wireless charging; the multi-wire parallel coil 501 included in the wireless charging module is used to transmit electrical energy from the energy storage device to an externally coupled coil through a magnetic field.

[0045] In a sixth aspect, the present application provides a charging system, characterized in that it includes the wireless charging device as described in the fourth aspect and the wireless charging device as described in the fifth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG1 is a schematic diagram of a wireless charging system applicable to the present application;

[0047] FIG2 is a schematic diagram of several wireless reverse charging scenarios provided by an embodiment of the present application;

[0048] FIG3 is a schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0049] FIG4 is a schematic diagram of the wireless charging principle;

[0050] FIG5 is a schematic diagram showing the principle of suppressing the circulating current of a bifilar coil 501 by using an inductive and capacitive network;

[0051] FIG6 is a schematic diagram of the negative coupling inductance equivalent to the target structure;

[0052] FIG7 is a schematic diagram of a three-wire parallel-wound coil 501 connected to three sets of negatively coupled inductors;

[0053] FIG8 is a schematic diagram of a three-wire parallel-wound coil 501 connected to two sets of negative coupling inductors;

[0054] FIG9 is a schematic diagram of a bifilar coil 501;

[0055] FIG10 is a schematic diagram of a bifilar coil 501;

[0056] FIG11 is a schematic diagram of a target structure 502;

[0057] FIG12A is a schematic diagram of the magnetic core of the first magnetic core portion 1104 reused at the back of the coil;

[0058] FIG12B is a schematic diagram of the magnetic core of the first magnetic core portion 1104 reused at the back of the coil;

[0059] FIG12C is a schematic diagram of the magnetic core of the first magnetic core portion 1104 reused at the back of the coil;

[0060] Figure 13 shows how a magnetic ring can be realized by digging holes in the magnetic core at the back of the coil;

[0061] FIG14 is a schematic diagram of a negative coupling inductor structure directly wound in the middle of a bifilar coil;

[0062] FIG15 is a schematic diagram of a structure in which a negative coupling inductor is wound on the surface of a magnetic core and then covered with a magnetic core to increase the inductance of the negative coupling inductor;

[0063] Figure 16 is a diagram showing a multi-wire coil with each wire connected in series with a capacitor;

[0064] FIG17 is a circuit schematic diagram showing a circuit for suppressing inter-line circulating current by connecting capacitors in series with coils wound in parallel on N lines when the total capacitance of the circulating current suppression capacitors is equal to the capacitance of the compensation capacitors;

[0065] FIG18 is a circuit schematic diagram showing how to suppress inter-line circulating current using an LC band-stop network;

[0066] FIG19 is a circuit schematic diagram showing how to suppress inter-line circulating currents using an LC band-stop network. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0068] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0069] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two, and "at least one" and "one or more" refer to one, two or more. The singular expressions "a", "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0070] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0071] In the description of the embodiments of the present application, the terms "up", "down", "left", "right", "inside", "outside", "vertical", "horizontal", etc. indicate orientations or positional relationships that are defined relative to the orientations or positions of the components schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts. They are used for relative descriptions and clarifications, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They may change accordingly according to changes in the orientation of the components placed in the accompanying drawings, and therefore cannot be understood as limitations on the present application. In addition, the "vertical" involved in the present application is not vertical in the strict sense, but is within the allowable error range. The "parallel" is not parallel in the strict sense, but is within the allowable error range.

[0072] In the embodiments of this application, the same reference numerals are used to represent the same components or parts. For identical parts in the embodiments of this application, only one of the parts or parts may be labeled with a reference numeral in the figures as an example. It should be understood that the same reference numerals apply to the other identical parts or parts. In addition, the various parts in the drawings are not drawn to scale, and the sizes and dimensions of the parts shown in the drawings are only exemplary and should not be construed as limiting the present application.

[0073] For ease of understanding, the technical terms involved in this application are explained and illustrated below.

[0074] Wireless charging refers to a technology that uses electromagnetic fields, electromagnetic waves, mechanical waves, light, heat and other energy forms as a bridge to transmit electrical energy without the aid of electrical wires. The corresponding equipment is used at the sending and receiving ends to send and receive the corresponding energy for charging.

[0075] A magnet is a substance or material that can generate a magnetic field, or an object with magnetic properties. Magnets are bipolar; any magnet has two poles: the north pole (N) and the south pole (S). Different parts of a magnet have varying degrees of magnetic strength, with the poles being the strongest. Magnetic poles interact with each other, with like poles repelling each other and unlike poles attracting each other. Magnets are generally categorized as permanent magnets and soft magnets.

[0076] Permanent magnets are magnets that can maintain their magnetism for a long time. They are hard magnets that are not easily demagnetized or magnetized.

[0077] Permanent magnetic materials refer to materials that are difficult to magnetize and difficult to demagnetize once magnetized. Their main characteristic is high coercive force (usually greater than 1000 amperes per meter (A / m)).

[0078] Soft magnets are magnets that are easily magnetized, but their magnetism disappears easily after magnetization, and their magnetism cannot be maintained for a long time.

[0079] Soft magnetic materials refer to magnetic materials with low coercive force (less than 1000A / m, usually less than 100A / m) and high magnetic permeability. Their main characteristics are that they are easy to magnetize and demagnetize, and can achieve maximum magnetization intensity with a minimum external magnetic field.

[0080] FIG1 shows a schematic diagram of a wireless charging system applicable to the present application.

[0081] As shown in Figure 1, wireless charging system 100 may include a wireless charging transmitter 110 and a wireless charging receiver 120. Energy coupling enables energy transfer between wireless charging transmitter 110 and wireless charging receiver 120. More specifically, wireless charging transmitter 110, acting as an energy source, can charge wireless charging receiver 120 using the principle of electromagnetic induction.

[0082] In some embodiments, the wireless charging transmitting device 110 as a power supply device may also be referred to as a transmitting end, and the wireless charging receiving device 120 as a power receiving device may also be referred to as a receiving end.

[0083] In the embodiment of the present application, the wireless charging transmitting device 110 or the wireless charging receiving device 120 can be a smart phone, a smart watch, a smart bracelet, a stylus, an earphone, a charging box, a tablet computer, an e-reader, a laptop computer, a camera, a vehicle-mounted device, a wireless charger, a mobile charger (also called a mobile power supply or a mobile power supply), a wearable device (such as smart glasses, smart jewelry, etc.), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a smart home device (such as a smart screen, a smart TV) or a vehicle, etc., which have a wireless charging function.

[0084] As an example and not a limitation, the wireless charging transmitting device 110 is a charging base, and the wireless charging receiving device 120 is a mobile phone; alternatively, the wireless charging transmitting device 110 is a charging box, and the wireless charging receiving device 120 is a wireless headset; alternatively, the wireless charging transmitting device 110 is a smart phone, and the wireless charging receiving device 120 is a smart watch; alternatively, the wireless charging transmitting device 110 is a vehicle, and the wireless charging receiving device 120 is a portable electronic device such as a mobile phone, a tablet computer, and the like.

[0085] In some embodiments, the wireless charging system 100 may further include a charger 130, which is connected to the wireless charging transmitter 110. The charger 130 may be configured to receive AC power and convert it into DC power for output to the wireless charging transmitter 110. Alternatively, the charger 130 may be configured to directly output received AC power to the wireless charging transmitter 110. The wireless charging transmitter 110 is configured to convert received electrical energy into electromagnetic field energy and transmit it to the outside world. The wireless charging receiver 120 is configured to receive electromagnetic field energy and convert it into electrical energy, thereby achieving wireless charging.

[0086] In some embodiments, the wireless charging system 100 may further include an energy device 140, such as a battery. The wireless charging transmitter 110 may be directly connected to the energy device 140 to receive direct current or alternating current provided by the energy device 140 as input.

[0087] In some embodiments, the wireless charging receiving device 120 can also serve as an energy source to charge other devices that support wireless charging. For example, a mobile phone with wireless charging functionality can charge wireless charging-enabled devices such as headphones, watches, or other mobile phones. In other words, the wireless charging receiving device 120 can both receive power from the wireless charging transmitting device 110 and function as a wireless charging transmitting device to charge other wireless charging receiving devices, thus supporting wireless reverse charging. Unlike the power supply method of a wireless charging base, wireless reverse charging relies primarily on the device battery, resulting in relatively low charging power.

[0088] It should be noted that the term "device having a wireless charging function" or similar descriptions used in this application can be understood as meaning that the device has the ability to wirelessly transmit power to other devices and / or the device has the ability to wirelessly receive power transmitted from other devices. In other words, the device can be either a transmitter or a receiver.

[0089] It should be noted that the "device having a wireless reverse charging function" or similar descriptions involved in this application can be understood as the device having the ability to receive power transmitted from other devices wirelessly and the ability to transmit power to other devices wirelessly.

[0090] Figure 2 shows a schematic diagram of several wireless reverse charging scenarios provided by the embodiments of the present application. It is understood that the embodiments of the present application do not limit the specific form of the wireless reverse charging scenarios, and the wireless reverse charging scenarios described in Figure 2 are only a few examples given for ease of understanding.

[0091] As shown in (a) of Figure 2, the wireless reverse charging scenario may include a mobile phone 121 and a watch 151. The mobile phone 121 can act as a receiving end to receive the power during the wireless charging process, or it can act as a transmitting end to wirelessly reverse charge the watch 151 after turning on the wireless reverse charging function. In this case, the watch 151 is the receiving end in the wireless reverse charging process.

[0092] As shown in (b) of Figure 2, the wireless reverse charging scenario may include a mobile phone 122 and an earphone charging box 152. The mobile phone 122 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the earphone charging box 152 after the wireless reverse charging function is turned on. In this case, the earphone charging box 152 is the receiver during the wireless reverse charging process.

[0093] As shown in (c) of Figure 2, the wireless reverse charging scenario may include a first mobile phone 123 and a second mobile phone 153. The first mobile phone 123 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the second mobile phone 153 after turning on the wireless reverse charging function. In this case, the second mobile phone 153 is the receiver during the wireless reverse charging process.

[0094] As shown in (d) of FIG2 , the wireless reverse charging scenario may include a tablet computer 124 and a stylus pen 154. The tablet computer 124 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the stylus pen 154 after the wireless reverse charging function is enabled. In this case, the stylus pen 154 acts as a receiver during the wireless reverse charging process.

[0095] In (a) to (d) of FIG2 , the watch 151 , the earphone charging box 152 , the second mobile phone 153 , and the stylus 154 may not have the wireless reverse charging function, or the wireless reverse charging function may not be turned on temporarily.

[0096] It should be understood that the embodiments of the present application do not limit the specific types of devices in the wireless reverse charging scenario. For example, the power supply device (i.e., the electronic device that turns on the wireless reverse charging function and wirelessly charges other devices) can be, for example, a mobile phone, a tablet computer, a laptop computer, or other portable electronic device. The power receiving device (i.e., the electronic device that is wirelessly charged by the power supply device) can be, for example, a mobile phone, a bracelet, a watch, a headset, a keyboard, a stylus, an electric toothbrush, or other portable electronic device.

[0097] In addition, it can be understood that the wireless reverse charging scenario is one type of wireless charging scenario. Accordingly, (a) to (d) in Figure 2 are actually specific examples of the wireless charging system 100, the mobile phone 121, the mobile phone 122, the first mobile phone 123, and the tablet computer 124 are specific examples of the wireless charging transmitting device 110 shown in Figure 1, and the watch 151, the earphone charging box 152, the second mobile phone 153, and the stylus 154 are specific examples of the wireless charging receiving device 120 shown in Figure 1.

[0098] Figure 3 shows another wireless charging system 100 provided by an embodiment of the present application. The embodiment shown in Figure 3 is described by taking the wireless charging transmitting device 110 as a glasses case and the wireless charging receiving device 120 as smart glasses as an example.

[0099] The wireless charging transmitter device 110 may include a housing 111 and a wireless charging module 113. The wireless charging module 113 may be fixed to the housing 111, for example, to the inner wall of the housing 111. The housing 111 may also be used to accommodate glasses, such as the wireless charging receiver device 120 shown in FIG3 .

[0100] The wireless charging receiving device 120 may include a frame 123, temples 124, and a lens 125. The number of temples 124 may be one or more. In the embodiment shown in FIG3 , the number of temples 124 may be multiple. The lens 125 is fixed to the frame 123.

[0101] One end of the temple 124 can be rotatably connected to one end of the frame 123 via a connecting shaft, so that the temple 124 can switch between an expanded state and a folded state. In some embodiments, one end of the temple 124 can be detachably connected to one end of the frame 123 via a connecting shaft. When the temple 124 is in the expanded state, the temple 124 can be worn on the user's ear. Figure 3 is a schematic diagram of the temple 124 in the folded state. When the temple 124 is in the folded state, the temple 124 is folded relative to the frame 123. In some embodiments, the temple 124 in the folded state is conducive to the smart glasses 100 being stored in a glasses case (such as the wireless charging transmitter device 110 shown in Figure 3, or an ordinary glasses case).

[0102] The temples 124 may be provided with electronic components (not shown), such as a motherboard, a wireless charging module 122, a battery, etc. The motherboard may be provided with a voice control module, a gesture recognition module, or an eye tracking module, etc. The battery serves as a power source and can provide electrical energy to the temples 124. The wireless charging module 122 may include a receiving coil, and the wireless charging module 122 may charge the battery via the receiving coil. In some embodiments, the battery may be located at the end of the temple away from the frame, and the wireless charging module 122 and the motherboard may be located at the end of the temple close to the frame.

[0103] In some possible scenarios, smart glasses may be augmented reality (AR) smart glasses. When the smart glasses are worn on the user's head, the user can see the image presented by the display unit (not shown) of the smart glasses. That is, the user can not only view the real-world scene through the smart glasses, but also observe the image of the virtual world through the smart glasses. In some embodiments, the user can also use the smart glasses to enable the smart glasses to enhance the observation effect of the real world by displaying virtual images. In other possible scenarios, smart glasses may not be limited to AR smart glasses, and smart glasses may also be other smart glasses, such as VR smart glasses that realize virtual reality (VR) effects or smart glasses that realize mixed reality (MR) effects, smart glasses with audio functions, etc.

[0104] The following describes the principle of wireless charging from the wireless charging transmitting device 110 to the wireless charging receiving device 120 in conjunction with the wireless charging system 100 shown in FIG. 1 , FIG. 2 and FIG. 3 .

[0105] During the process of wireless charging transmitting device 110 wirelessly charging wireless charging receiving device 120 , wireless charging transmitting device 110 and wireless charging receiving device 120 may be close to each other so that the transmitting coil of wireless charging transmitting device 110 may be coupled with the receiving coil of wireless charging receiving device 120 .

[0106] In the embodiment shown in FIG1 , a magnetic component may be provided near the frame of the wireless charging transmitter device 110 . The magnetic component may be used to attach the wireless charging receiver device 120 to the frame of the wireless charging transmitter device 110 , so that the transmitting coil of the wireless charging transmitter device 110 can be stably coupled with the receiving coil of the wireless charging receiver device 120 .

[0107] In the embodiment shown in FIG3 , the wireless charging receiving device 120 can be folded and accommodated in the accommodating cavity of the wireless charging transmitting device 110 , and the wireless charging module 122 of the wireless charging receiving device 120 can be arranged close to the wireless charging module 113 of the wireless charging transmitting device 110 , so that the transmitting coil of the wireless charging transmitting device 110 can be stably coupled with the receiving coil of the wireless charging receiving device 120 .

[0108] The wireless charging module 113 can emit a changing magnetic field through a transmitting coil. The coil of the wireless charging module 122 can sense the magnetic field from the wireless charging module 113 and generate an induced current. The wireless charging module 122 can transmit the induced current generated by the coil to other components within the wireless charging receiving device 120, such as a battery. In this scenario, the coil of the wireless charging transmitting device 110 can be the transmitting coil, and the coil of the wireless charging receiving device 120 can be the receiving coil.

[0109] In some embodiments, the wireless charging transmitting device 110 can also be a wireless charging receiving device, that is, other devices can wirelessly charge the wireless charging module 113. The coil of the wireless charging module 113 can sense the magnetic field from other devices and generate an induced current. The wireless charging module 113 can transfer the induced current generated by the coil to other devices in the wireless charging module 113. In this scenario, the coil of the wireless charging transmitting device 110 can be a receiving coil. That is to say, the coil of the wireless charging transmitting device 110 can act as both a transmitting coil and a receiving coil. For example, in the embodiment shown in Figure 3, the glasses case can obtain electrical energy from the wireless charger through the wireless charging module 113.

[0110] In other embodiments, the wireless charging receiving device 120 can also be a wireless charging transmitting device, that is, the wireless charging module 122 can wirelessly charge other devices. The coil of the wireless charging module 122 can emit a changing magnetic field so that the wireless charging receiving device 120 can wirelessly charge other devices. In this scenario, the coil of the wireless charging receiving device 120 can be a transmitting coil. In other words, the coil of the wireless charging receiving device 120 can act as both a receiving coil and a transmitting coil. For example, in the embodiment shown in Figure 1, the stylus can wirelessly charge other devices through the wireless charging module 122. For another example, in the embodiment shown in Figure 2, smart glasses can wirelessly charge other devices through the wireless charging module 12.

[0111] In some embodiments provided herein, the coil may be a ring-shaped winding formed by tightly winding a conductive wire, and the conductive wire may be wrapped with an insulating material.

[0112] Figure 4 shows a schematic diagram of the wireless charging principle. As shown in Figure 4, the wireless charging scenario involves a transmitter 210 (i.e., a power supply device) and a receiver 220 (i.e., a power receiving device). Both the transmitter 210 and the receiver 220 have wireless charging capabilities, which are used to implement the wireless charging process of the transmitter 210 to the receiver 220.

[0113] The transmitter 210 may include a first coil 211, a first chip 212, and a power supply 213. The receiver 220 may include a second coil 221, a second chip 222, and a load 223. The first coil 211 and the second coil 221 are used to implement energy coupling. The first chip 212 and the second chip 222 are used to implement wireless charging control or management. The power supply 213 and the load 223 are used to store electrical energy.

[0114] After the wireless charging area of ​​the transmitter 210 is aligned with the wireless charging area of ​​the receiver 220, the transmitter 210 can wirelessly charge the receiver 220. Specifically, during the wireless charging process, the transmitter 210 can control the power supply 213 to output current to the first coil 211 (i.e., the power output coil) through the first chip 212, so that the first coil 211 can emit a high-frequency magnetic field, that is, convert the electrical signal into a magnetic signal. The high-frequency magnetic field can pass through the second coil 221 (i.e., the power receiving coil), so that an induced current is generated on the second coil 221, that is, the magnetic signal is converted into an electrical signal. The second chip 222 can detect the induced current and input the induced current to the load 223.

[0115] In some embodiments, the first chip 212 may include a transformer module and a transmitter circuit, wherein the transformer module is used to implement voltage conversion and the transmitter circuit is used to convert direct current into alternating current signals. Accordingly, the first coil 211 is used to convert the alternating current signals into magnetic signals and transmit them.

[0116] In some embodiments, the second chip 222 may include a transformer module and a receiving circuit, wherein the second coil 221 is used to convert the magnetic signal into an AC signal, the receiving circuit is used to convert the AC signal into a DC signal, and the transformer module is used to achieve voltage conversion.

[0117] In wireless charging systems, using coils wound with multiple wires, bundles, or strands can flexibly increase the coil's current-carrying capacity, adapting to different application requirements. However, due to the skin effect and proximity effect at high frequencies, the currents flowing through each wire are inconsistent, resulting in a lower Q factor than a single-wire coil of the same size, hindering system efficiency.

[0118] The reason for current imbalance in multi-wire coils is the difference in self-inductance and mutual inductance between the sub-coils corresponding to each wire. Existing techniques reduce the difference in self-inductance between the coils corresponding to each wire by cross-winding the wires once or multiple times, thereby improving current balance within each wire. However, coils wound with Litz wire have increased thickness at the crossover locations, making this method unsuitable for coils with a thickness that matches the diameter of a single wire. Automated production is also difficult to achieve with crossovers at specific locations.

[0119] An embodiment of the present application provides a wireless charging module 500, comprising: a multi-wire parallel-wound coil 501, wherein the multi-wire parallel-wound coil 501 is formed by winding multiple wires in parallel; wherein a target structure 502 is connected between at least two wires in the multi-wire parallel-wound coil 501; the target structure 502 is equivalent to a negative coupling inductor, and the target structure is a structure formed by the local structure of the two wires or a structure independent of the two wires.

[0120] The wireless charging module 500 provided in the embodiment of the present application can be applied to a transmitting end and / or a receiving end.

[0121] Specifically, as shown in Figure 5, Figure 5 is a schematic diagram of the principle of using an inductive and capacitive network to suppress the circulating current of a two-wire parallel coil 501. For a multi-wire parallel coil 501, the current can be split into an effective current and a circulating current. Based on the idea of ​​suppressing the circulating current without affecting the effective current, the embodiment of the present application introduces an inductive and capacitive network in the inter-wire loop to increase the loop impedance formed between the wires in the parallel coil 501, while not affecting the effective current path impedance of the non-circulating current, thereby achieving the purpose of improving the current balance of each wire in the multi-wire parallel coil 501 and reducing the loss of the multi-wire parallel coil 501.

[0122] In the embodiment of the present application, a negative coupling inductor can be connected to the inter-wire loop of the multi-wire parallel coil 501 to increase the loop impedance, thereby suppressing the loop current and solving the problems of additional losses and uneven heat distribution caused by the circulation current in the multi-wire parallel coil 501. Referring to FIG6 , FIG6 shows a schematic diagram of the negative coupling inductor equivalent to the target structure 502.

[0123] In one possible implementation, the target structure 502 is connected between each wire in the multi-wire parallel coil 501 and at least one other wire. When the negative coupling inductance is sufficiently large, connecting at least one set of negative coupling inductors between each wire and the other wires can achieve a good circulating current suppression effect. In this case, at least N-1 sets of negative coupling inductors are required (as shown in FIG8 , two sets of negative coupling inductors are connected to the three-wire parallel coil 501). In other words, there is no need to set a negative coupling inductor between any two wires, thereby reducing costs.

[0124] In one possible implementation, the target structure 502 is connected between any two coils 501. Ideally, a set of negative coupling inductors is connected between any two wires, and N parallel-wound coils 501 require a total of N·(N-1) / 2 sets of negative coupling inductors (for example, as shown in FIG7 , three parallel-wound coils 501 are connected to three sets of negative coupling inductors). This maximizes loop impedance and achieves better circulating current suppression.

[0125] Next, several target structures 502 that can be equivalent to negative coupled inductors are described:

[0126] 1. The magnetic ring 503 and the output end of the reuse coil 501 realize negative coupling inductance.

[0127] That is, an additional magnetic ring 503 is provided as the magnetic core of the negative coupling inductor, and the outgoing wire of the reused coil 501 is used as the winding of the negative coupling inductor.

[0128] In a possible implementation, the at least two wires include a first wire and a second wire; the target structure 502 includes a magnetic ring 503 , and the outgoing wire ends on the same side of the first wire and the second wire are wound around the magnetic ring 503 .

[0129] The magnetic ring 503 may also be referred to as a ring magnet, and the material of the magnetic ring 503 may be a soft magnetic material.

[0130] In some embodiments, it can be any of the following materials:

[0131] 1) Pure iron and low carbon steel: high saturation magnetization, low price and good processing performance;

[0132] 2) Iron-silicon alloy materials: After adding silicon to pure iron, the phenomenon that the magnetic properties of magnetic materials change with use time can be eliminated;

[0133] 3) Iron-aluminum alloy materials: have good soft magnetic properties, high magnetic permeability and resistivity, high hardness and good wear resistance;

[0134] 4) Sendust alloy materials: high hardness, saturation magnetic induction intensity, magnetic permeability and resistivity;

[0135] 5) Nickel-iron alloy materials: Through the ratio of alloying elements and appropriate processes, the magnetic properties can be controlled to obtain soft magnetic materials such as high magnetic permeability, constant magnetic permeability, and moment magnetic properties;

[0136] 6) Iron-cobalt alloy materials: have high saturation magnetization and low resistivity;

[0137] 7) Soft ferrite: It is a non-metallic ferromagnetic soft magnetic material with high resistivity, lower saturation magnetization than metal, and low price;

[0138] 8) Amorphous soft magnetic alloy material: also known as metallic glass or amorphous metal, it has high magnetic permeability and resistivity, low coercivity, is insensitive to stress, does not have magnetocrystalline anisotropy caused by crystal structure, and has the characteristics of corrosion resistance and high strength;

[0139] 9) Ultra-fine crystal soft magnetic alloy material: generally composed of a crystalline phase smaller than about 50 nanometers and an amorphous grain boundary phase, also known as nanocrystals, with the characteristics of high magnetic permeability, low coercive force, small iron loss, high saturation magnetic induction intensity and good stability.

[0140] Exemplarily, the soft magnetic material used in the ring magnet may include at least one of iron (Fe), iron nickel (FeNi), iron silicon (FeSi), amorphous, and nanocrystalline.

[0141] In the embodiments of the present application, the annular magnet is annular, i.e., a hollow closed shape. The annular magnet can be, for example, a circular ring, a square ring, an elliptical ring, a triangular ring, etc. The embodiments of the present application do not limit the specific shape of the annular magnet. In actual applications, the shape of the annular magnet can be set according to actual needs. For ease of understanding, the embodiments provided in this application are described using the annular magnet in the shape of a circular ring as an example, but it can be understood that this application is not limited to this.

[0142] In one possible implementation, the negative coupling inductor can be formed by using the output wires of the multi-wire parallel coil 501 and the magnetic ring 503. Taking the first wire and the second wire in the multi-wire parallel coil 501 as an example, the output wire ends on the same side of the first wire and the second wire can be wound around the magnetic ring 503, and the winding directions are opposite.

[0143] As shown in Figures 9 and 10, Figure 9 shows a bifilar coil 501, where the outgoing wires on one side are both wound around the same magnetic ring 503, and the winding directions are opposite. This allows the effective current to form magnetic fields in the magnetic ring to cancel each other out, with almost no inductive reactance, while the magnetic fields formed by the inter-wire circulating currents in the magnetic ring are mutually enhanced, presenting a large inductive reactance. Figure 10 shows a bifilar coil 501, where the outgoing wires on both sides are both wound around the same magnetic ring 503, and the two wires at the same end and the outgoing wires at both ends of the same wire are wound in opposite directions. This allows the effective current to form magnetic fields in the magnetic ring to cancel each other out, with almost no inductive reactance, while the magnetic fields formed by the inter-wire circulating currents in the magnetic ring are mutually enhanced, presenting a large inductive reactance.

[0144] For a two-wire parallel-wound coil 501, the wires at one or both ends of the coil 501 can be passed through a magnetic ring 503 to form the required negative coupling inductance. The number of magnetic rings 503 corresponds to the number of required negative coupling inductance groups. N parallel-wound coils require at least N-1 magnetic rings 503.

[0145] In this way, the added negative coupling inductor can be formed by the outgoing wire of the coil 501 and the magnetic ring 503, and the outgoing wire of the coil 501 is reused as the negative coupling inductor winding, thereby realizing a negative coupling inductor with a high Q value at a low cost.

[0146] 2. Use PCB traces and the magnetic core on the back of the reuse coil to achieve negative coupling inductance.

[0147] In one possible implementation, the magnetic core on the back of the coil can be reused as part of the magnetic core of the negative coupling inductor, and an additional PCB trace (connected to the coil) is provided as the winding of the negative coupling inductor.

[0148] In one possible implementation, the multi-wire parallel coil composed of at least two wires includes a first wire and a second wire; the target structure includes a circuit board substrate 1101 and a magnetic ring, the circuit board substrate 1101 includes a first hole 1106, a second hole 1107, a first wire 1102 wound around the first hole 1106, and a second wire 1103 wound around the second hole 1107, the magnetic ring passes through the first hole 1106 and the second hole 1107, the outlet end of the first wire is connected to the first wire 1102, and the outlet end of the second wire is connected to the second wire 1103.

[0149] For example, the circuit board substrate is a PCB board. A first hole 1106 and a second hole 1107 may be provided on the circuit board substrate. On the one hand, a winding of a negative coupling inductor may be arranged on the circuit board substrate. Taking the first wire and the second wire as an example, the outlet end of the first wire and the outlet end of the second wire (the outlet ends on the same side of the first wire and the second wire) may be respectively connected to two windings on the circuit board substrate (that is, windings formed by the first wire 1102 and the second wire 1103 being wound around the first hole 1106 and the second hole 1107, respectively). On the other hand, the first hole 1106 and the second hole 1107 may serve as magnetic core slots reserved in the PCB. The magnetic ring serving as the magnetic core of the negative coupling inductor may pass through the first hole 1106 and the second hole 1107 provided on the circuit board substrate, thereby enabling the magnetic core of the negative coupling inductor to couple with the two windings on the circuit board substrate to form a negative coupling inductor.

[0150] In one possible implementation, the magnetic ring can be an additional arrangement, that is, a magnetic core independent of the back of the coil. In order to save costs, there is a magnetic core on the back of the coil, and the negative coupling inductor also requires a magnetic core, so the magnetic core parts of the two can be reused to improve the overall integration, reduce volume and cost. Therefore, the magnetic ring used can include a first magnetic core portion 1104 and a C-shaped second magnetic core portion 1105. For example, the first magnetic core portion 1104 can be I-shaped, the first magnetic core portion 1104 belongs to the magnetic core, and the second magnetic core portion 1105 is buckled on the first magnetic core portion 1104 and passes through the first hole 1106 and the second hole 1107.

[0151] The structure shown in Figure 11 includes a circuit board substrate 1101, a first wire 1102, a second wire 1103, a first magnetic core portion 1104 and a second magnetic core portion 1105, wherein the circuit board substrate 1101 is provided with a first hole 1106 and a second hole 1107, the first wire 1102 is wound around the first hole 1106, and the second wire 1103 is wound around the second hole 1107. The left side of Figure 11 shows a schematic diagram of the structure in which the first magnetic core portion 1104 is buckled onto the second magnetic core portion 1105 before passing through the first hole 1106 and the second hole 1107, and the left side of Figure 11 shows a schematic diagram of the structure in which the first magnetic core portion 1104 passes through the first hole 1106 and the second hole 1107 and is buckled onto the second magnetic core portion 1105.

[0152] 12A , FIG12A shows a schematic diagram of a first magnetic core portion 1104 reusing the magnetic core at the back of the coil.

[0153] Furthermore, in one possible implementation, the second magnetic core portion 1105 and the multi-filar coil may be located on opposite sides of the magnetic core. In other words, the target structure 502 equivalent to the negative coupling inductor may also be disposed on the back side of the magnetic core of the coil, which may make the overall structure more compact.

[0154] In a possible implementation, the at least two wires include a first wire and a second wire; the target structure 502 includes a circuit board substrate 1101, a first magnetic core portion 1104 and an E-shaped second magnetic core portion 1105; wherein,

[0155] The circuit board substrate includes a third hole 1108, a first wire 1102 and a second wire 1103 wound around the third hole 1108, wherein the first wire 1102 and the second wire 1103 are on different layers of the circuit board substrate 1101, the middle protrusion of the second magnetic core portion 1105 passes through the third hole 1108, the outlet end of the first wire is connected to the first wire 1102, and the outlet end of the second wire is connected to the second wire 1103; the first magnetic core portion 1104 belongs to the magnetic core, and the second magnetic core portion 1105 is buckled on the first magnetic core portion 1104 and passes through the third hole 1108.

[0156] In one possible implementation, the circuit board substrate further includes a fourth hole 1109 and a fifth hole 1110, through which the protrusions on both sides of the second magnetic core portion 1105 respectively pass. For example, reference can be made to FIG12B, which shows a schematic diagram of the magnetic core of the first magnetic core portion 1104 reusing the coil back.

[0157] In a possible implementation, the protrusions on both sides of the second magnetic core portion 1105 pass through both sides of the circuit board substrate and are buckled onto the first magnetic core portion 1104. Referring to Figure 12C, Figure 12C shows a schematic diagram of the first magnetic core portion 1104 reusing the magnetic core at the back of the coil.

[0158] Among them, the first magnetic core portion 1104 and the second magnetic core portion 1105 can be but are not limited to C-type combined with I-type, C-type combined with C-type, E-type combined with I-type, E-type combined with E-type, or pot-shaped, etc. When using E-type or pot-shaped magnetic cores, the first wire 1102 and the second wire 1103 can be wound around the same hole.

[0159] 3. The output terminal of the multiplexing coil and the magnetic core on the back of the multiplexing coil realize negative coupling inductance.

[0160] In a possible implementation, the magnetic core on the back of the coil can be reused as the magnetic core of the negative coupling inductor, and the coil output end can be reused as the winding of the negative coupling inductor.

[0161] In one possible implementation, the multi-wire parallel coil composed of at least two wires includes a first wire and a second wire; the multi-wire parallel coil is attached to a magnetic core; wherein the target structure can be formed by the following structure: the magnetic core is provided with a through hole 1301 at the outlet ends of the first wire and the second wire, the outlet end of the first wire passes through the through hole 1301, and the outlet end of the second wire does not pass through the through hole 1301.

[0162] When there's a magnetic core behind the coil and sufficient space, as shown in Figure 13, the magnetic ring can be created by digging holes in the core behind the coil, with the coil wires threaded through the holes in the core to form a negatively coupled inductor. This added negatively coupled inductor can be directly constructed on the coil module, integrating it with the coil, eliminating the need for additional components and helping to reduce cost and size.

[0163] In addition, the embodiments of the present application do not limit the number of openings and the method of perforating the coil. For example, in one possible implementation, the multi-wire parallel coil composed of at least two wires includes a first wire and a second wire; the multi-wire parallel coil is attached to the magnetic core; wherein, the target structure can be formed by the following structure: the magnetic core is provided with a plurality of through holes 1301 at the outlet ends of the first wire and the second wire, and the outlet ends of the first wire and the second wire respectively pass through the plurality of through holes 1301 in sequence, and the perforation directions are opposite.

[0164] 4. The output end of the multiplexed coil realizes negative coupling inductance.

[0165] In a possible implementation, a negative coupling inductor may be wound in the middle of the coil or on the back magnetic core.

[0166] In one possible implementation, the multi-wire parallel coil composed of at least two wires includes a first wire and a second wire; the first wire includes a first wire segment 1401, the second wire includes a second wire segment 1402, the first wire segment 1401 and the second wire segment 1402 are adjacent and arranged side by side, and the effective current directions on the first wire segment 1401 and the second wire segment 1402 are opposite.

[0167] For example, for a multi-filar coil with a magnetic core backplane, if there is ample space in the middle of the coil or on the magnetic back, a negative coupling inductor can be directly wound on the middle of the coil or on the back of the magnetic core. Refer to Figure 14, which shows a schematic diagram of a negative coupling inductor structure wound directly in the middle of a bifilar coil.

[0168] In one possible implementation, a second magnetic core 1501 is placed over the first magnetic core in the area where the first line segment 1401 and the second line segment 1402 are located. This means that a further layer of magnetic core can be placed over the negatively coupled inductor to increase the inductance. Referring to Figure 15 , Figure 15 illustrates a schematic diagram of a structure in which a negatively coupled inductor is wound around the surface of a magnetic core and then covered with a magnetic core to increase the inductance of the negatively coupled inductor.

[0169] In addition, an embodiment of the present application also provides a wireless charging module, including: a multi-wire parallel-wound coil, which is formed by winding multiple wires in parallel; wherein, each wire in the multi-wire parallel-wound coil is connected in series with a capacitor, and the main circuit after the multi-wire parallel-wound coil is connected is connected in series with a compensation inductor, and the product of the inductance of the compensation inductor and the total capacitance of the capacitor connected in series on each wire in the multi-wire parallel-wound coil is related to the operating frequency or resonant compensation frequency of the coil.

[0170] In a possible implementation, the product of the inductance of the compensation inductor and the total capacitance of the capacitor connected in series on each wire in the multi-wire parallel coil is: 1 / (ω 2 ), where ω is the operating frequency or the resonant compensation angular frequency.

[0171] In one possible implementation, the capacitances of the capacitors connected in series on different lines are equal (for example, when the circulating currents in each loop are equal, the capacitances of the capacitors connected in series on different lines can be set to be equal, thereby improving the suppression effect on the loop current).

[0172] The embodiment of the present application can increase the inter-line loop capacitive reactance to suppress the loop current. As shown in Figure 16, each wire of the multi-wire parallel coil is connected in series with a capacitor, thereby introducing a large capacitive reactance in any inter-line loop and reducing the inter-line circulating current. Since the series capacitor is also equivalent to connecting a capacitor with a total capacitance value C (C = C1 + C2 + ... + Cn) in series on the effective current loop, in order to avoid or reduce the impact on the impedance characteristics of the effective current loop, a compensation inductor L can be connected in series on the main circuit for compensation. The inductance of the compensation inductor and the total capacitance of the series capacitor satisfy: L = 1 / (ω 2 C), when the operating frequency is fixed, ω can be the operating angular frequency or the resonant compensation angular frequency of the coil; when the operating frequency is not fixed, ω can be the resonant compensation angular frequency of the coil.

[0173] In addition, since loop current suppression can be considered to be related to the magnitude of the loop impedance and not to its sign, the loop current suppression characteristics can be basically unchanged by replacing the inductor with a capacitor or the capacitor with an inductor while maintaining the same impedance magnitude. When the capacitor is replaced with the inductor, the inductance of the compensation capacitor and the inductor in series can satisfy the following equation: 1 / L1+1 / L2+…+1 / Ln=ω 2 C, C are compensation capacitors.

[0174] Through the above method, a capacitor is connected in series with each wire in the multi-wire parallel coil to increase the loop capacitive reactance of the multi-wire parallel coil. At the same time, an inductor is connected in series with the main circuit to offset the influence of the capacitor on the effective current. The capacitor has the advantages of small size and low cost, and can improve the problems of circulation loss and uneven heating of the multi-wire parallel coil at extremely low size and cost.

[0175] For applications where series compensation capacitors are present in the main circuit, the compensation inductor L can partially or completely offset the compensation capacitor. Specifically, when the total capacitance of the circulating current suppression capacitors is equal to the capacitance of the series compensation capacitors, the compensation inductor L completely offsets the reactance of the compensation capacitors, eliminating the need for series compensation inductors and capacitors in the main circuit. The circuit is then simplified to Figure 17, which shows the circuit schematic for achieving inter-line circulating current suppression using N-wire parallel windings and series capacitors when the total capacitance of the circulating current suppression capacitors is equal to the capacitance of the compensation capacitors. This is equivalent to directly using the compensation capacitors for circulating current suppression without the need for additional components, thus reducing costs.

[0176] In one possible implementation, in order to further enhance the suppression effect of inter-line circulating current, in addition to connecting capacitors in series on different lines, inductors of the same size can also be connected between different lines to construct an LC band-stop network. Referring to Figure 18, Figure 18 is a circuit schematic diagram for suppressing inter-line circulating current using an LC band-stop network. An additional inductor can be connected between any two lines of the N-line parallel coil, so that the inductor and the circulating current suppression capacitor form an LC band-stop network. In order to avoid the interference of the newly introduced inductor on the effective current loop, it is necessary to satisfy C1=C2=…=Cn=C0. When the center frequency of the desired band-stop network is ω0, L12=…=L1n=…=Lmn=N / (ω0 2 C0). It should be understood that since loop current suppression can be considered to be related to the magnitude of the loop impedance and not its sign, the loop current suppression characteristics can be essentially unchanged by replacing the inductor with a capacitor or vice versa while maintaining the same impedance magnitude.

[0177] In a wireless power transmission system using multi-wire parallel-wound coils, an LC band-stop network is constructed. The band-stop network is constructed in the loop formed between the wires of the multi-wire parallel-wound coils to achieve inter-wire circulating current suppression without affecting the effective current loop impedance. The band-stop network constructed in the loop presents a very high impedance within the band-stop frequency range. When the band-stop frequency matches the operating frequency, the loop current in the multi-wire parallel-wound coils can be effectively suppressed, and the capacitors in the band-stop network can be reused with series compensation capacitors, which can achieve good multi-wire parallel-wound coil circulating current loss suppression at a relatively low cost.

[0178] It should be understood that in one possible implementation, for applications where a series compensation capacitor exists in the main circuit, the compensation inductor L can partially or completely offset the compensation capacitor. When the total capacitance of the circulating current suppression capacitor is equal to the capacitance of the series compensation capacitor, the reactance of the compensation inductor L and the compensation capacitor is completely offset, eliminating the need for a series compensation inductor and capacitor in the main circuit. In this case, the circuit is simplified to that shown in Figure 19, which is equivalent to directly using the compensation capacitor for circulating current suppression without the need for additional components, thus offering a significant cost advantage.

[0179] The wireless charging module provided in the embodiments of the present application can be applied to charging devices, vehicles or portable electronic devices as a receiving end or a sending end of electric energy.

[0180] Taking vehicles as an example, with the popularization of vehicles, cars and other vehicles have become an indispensable means of transportation in people's daily lives. However, the development cycle of vehicles is long and the update iteration is slow, making it difficult to meet the diverse and personalized needs of consumers. Consumer electronic products such as mobile phones and watches are convenient for consumers to carry with them. Due to their short life cycle and fast update iteration, they can adapt to rapidly changing scene requirements. Therefore, the ecological integration of the consumer electronics industry and the automotive industry is imperative. In the embodiment of the present application, the wireless charging module involved above can be applied to vehicles, which is conducive to promoting the practice of installing consumer electronic products in vehicles.

[0181] In some embodiments, the wireless charging module provided by the embodiments of the present application can be installed in at least one of the vehicle's console, seat back, door armrest, center armrest, door interior panel, or trunk, allowing users to conveniently charge in-vehicle ecological devices through the wireless charging module. In the embodiments of the present application, when the wireless charging module is installed in the vehicle, the wireless charging module can be electrically connected to the vehicle's power supply circuit, and the energy source of the wireless charging module is the vehicle. In other words, the wireless charging module obtains energy from the vehicle's power supply circuit and can wirelessly charge other devices.

[0182] In some embodiments, the wireless charging module provided by the present application can be installed as a pre-installed component in the vehicle. This means that the wireless charging module is already built into the vehicle as a pre-installed accessory before the vehicle leaves the factory. This eliminates the need for exposed wires or charging ports to charge onboard devices, improving aesthetics and helping to meet the diverse needs of individual users.

[0183] In other embodiments, the wireless charging module provided in the embodiments of the present application is installed in the vehicle via a detachable connection structure, such as a clamp, a buckle, a thread, a Velcro fastener, etc. This allows users to conveniently use the wireless charging module to charge onboard ecological devices at different locations in the vehicle. In some embodiments, the wireless charging module can be electrically connected to the charging port on the vehicle via a charging connector or via contacts.

[0184] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless charging module, characterized in that, it includes: A multi-wire parallel-wound coil 501 formed by arranging multiple wires side by side; wherein, A target structure 502 is connected between at least two wires in the multi-wire parallel-wound coil 501; the target structure 502 is equivalent to a negative coupling inductor, and the target structure 502 is a structure formed by the local structures of the two wires or a structure independent of the two wires.

2. The wireless charging module according to claim 1, characterized in that, The target structure 502 is connected between each of the at least two wires and at least one other wire.

3. The wireless charging module according to claim 1 or 2, characterized in that, The target structure 502 is connected between any two of the wires.

4. The wireless charging module according to any one of claims 1 to 3, characterized in that, The at least two wires include a first wire and a second wire; the target structure 502 includes a magnetic ring 503, and the outgoing ends on the same side of the first wire and the second wire are wound around the magnetic ring 503, and the winding directions are opposite.

5. The wireless charging module according to any one of claims 1 to 3, characterized in that, The at least two wires include a first wire and a second wire; the target structure 502 includes a circuit board substrate 1101 and a magnetic ring. The circuit board substrate 1101 includes a first hole 1106, a second hole 1107, a first wire 1102 wound around the first hole 1106, and a second wire 1103 wound around the second hole 1107. The magnetic ring passes through the first hole 1106 and the second hole 1107. The outgoing end of the first wire is connected to the first wire 1102, and the outgoing end of the second wire is connected to the second wire 1103.

6. The wireless charging module according to claim 5, characterized in that, The multi-wire parallel-wound coil 501 is attached to a magnetic core; wherein, the magnetic ring includes a first magnetic core part 1104 and a C-shaped second magnetic core part 1105. The first magnetic core part 1104 belongs to the magnetic core, and the second magnetic core part 1105 is buckled on the first magnetic core part 1104 and passes through the first hole 1106 and the second hole 1107.

7. The wireless charging module according to any one of claims 1 to 3, characterized in that, The at least two wires include a first wire and a second wire; the target structure 502 includes a circuit board substrate 1101, a first magnetic core part 1104, and an E-shaped second magnetic core part 1105; wherein, The circuit board substrate includes a third hole 1108, a first wire 1102 wound around the third hole 1108, and a second wire 1103, wherein the first wire 1102 and the second wire 1103 are on different layers of the circuit board substrate 1101. The middle protrusion of the second magnetic core part 1105 passes through the third hole 1108. The outgoing end of the first line is connected to the first wire 1102, and the outgoing end of the second line is connected to the second wire 1103. The first magnetic core part 1104 belongs to the magnetic core, and the second magnetic core part 1105 is buckled on the first magnetic core part 1104 and passes through the third hole 1108.

8. The wireless charging module according to claim 7, characterized in that the circuit board substrate further includes a fourth hole 1109 and a fifth hole 1110, and the protruding parts on both sides of the second magnetic core part 1105 pass through the fourth hole 1109 and the fifth hole 1110 respectively.

9. The wireless charging module according to claim 7, characterized in that the protruding parts on both sides of the second magnetic core part 1105 pass through from both sides of the circuit board substrate and are buckled on the first magnetic core part 1104.

10. The wireless charging module according to claim 5 or 6, characterized in that the second magnetic core part 1105 and the multi-wire parallel winding coil 501 are located on opposite sides of the magnetic core.

11. The wireless charging module according to any one of claims 1 to 3, characterized in that the at least two wires include a first line and a second line; the multi-wire parallel winding coil 501 is attached to the magnetic core; wherein, the target structure 502 is formed by the following structure: the magnetic core is provided with a through hole 1301 at the outgoing ends of the first line and the second line, the outgoing end of the first line passes through the through hole 1301 and the outgoing end of the second line does not pass through the through hole 1301; or, the magnetic core is provided with a plurality of through holes 1301 at the outgoing ends of the first line and the second line, the outgoing ends of the first line and the second line respectively pass through the plurality of through holes 1301 in sequence, and the perforation directions are opposite.

12. The wireless charging module according to any one of claims 1 to 3, characterized in that the at least two wires include a first line and a second line; the first line includes a first line segment 1401, the second line includes a second line segment 1402, the first line segment 1401 and the second line segment 1402 are adjacent and arranged side by side, and the effective current directions on the first line segment 1401 and the second line segment 1402 are opposite.

13. The wireless charging module according to claim 12, characterized in that the multi-wire parallel winding coil 501 is attached to the first magnetic core; and a second magnetic core 1501 is covered on the area of the first magnetic core where the first line segment 1401 and the second line segment 1402 are located.

14. A wireless charging module, characterized in that comprises: a multi-wire parallel winding coil 501, which is formed by winding a plurality of wires side by side; wherein, A capacitor is connected in series on each wire in the multi-wire parallel-wound coil 501, and a compensation inductor is connected in series on the main circuit after the multi-wire parallel-wound coil 501 is connected. The product of the inductance value of the compensation inductor and the total capacitance value of the capacitors connected in series on different wires in the multi-wire parallel-wound coil 501 is related to the operating frequency or resonance compensation frequency of the coil.

15. The wireless charging module according to claim 14, wherein, the capacitance values of the capacitors connected in series on different wires are equal.

16. The wireless charging module according to claim 14 or 15, wherein, The product of the inductance value of the compensation inductor and the total capacitance value of the capacitors connected in series on the multi-wire parallel winding coil 501 is: 1 / (ω 2 ), where, when the operating frequency is fixed, ω is the operating angular frequency or the coil resonance compensation angular frequency; when the operating frequency is not fixed, ω is the coil resonance compensation angular frequency.

17. The wireless charging module according to claim 15 or 16, wherein, an inductor is connected between different wires.

18. A wireless charging module, wherein, comprises: a multi-wire parallel-wound coil 501 formed by winding multiple wires side by side; wherein, an inductor is connected in series on each wire in the multi-wire parallel-wound coil 501, and a compensation capacitor is connected in series on the main circuit after the multi-wire parallel-wound coil 501 is connected. The numerical relationship between the capacitance value of the compensation capacitor and the inductors connected in series on different wires in the multi-wire parallel-wound coil 501 is related to the operating frequency or resonance compensation frequency of the coil.

19. The wireless charging module according to claim 18, wherein, the inductance values of the inductors connected in series on different wires are equal.

20. The wireless charging module according to claim 18 or 19, wherein, The numerical relationship between the capacitance value of the compensation capacitor and the inductance connected in series on the multi-wire parallel winding coil 501 is: 1 / L1 + 1 / L2 + … + 1 / Ln = (ω 2 · C), where L1, L2, and Ln are inductances, C is the capacitance value of the compensation capacitor, the · represents multiplication, when the operating frequency is fixed, ω is the operating angular frequency or the coil resonance compensation angular frequency; when the operating frequency is not fixed, ω is the coil resonance compensation angular frequency.

21. The wireless charging module according to claim 19 or 20, wherein, a capacitor is connected between different wires.

22. A wireless charging device, wherein, comprises the wireless charging module according to any one of claims 1 to 21 and an energy storage device, and the wireless charging module is used as a receiving end of wireless charging; the multi-wire parallel-wound coil 501 included in the wireless charging module is used to receive electric energy and transmit the electric energy to the energy storage device.

23. A wireless charging device, wherein, comprises the wireless charging module according to any one of claims 1 to 21, and the wireless charging module is used as a transmitting end of wireless charging; the multi-wire parallel-wound coil 501 included in the wireless charging module is used to transmit electric energy to an externally coupled coil through a magnetic field.

24. A charging system, wherein, comprises the wireless charging device according to claim 22 and the wireless charging device according to claim 23.

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