Wireless charging earphone box, metal rotating shaft and method for reducing heating of metal rotating shaft

Abstract

The embodiment of the invention discloses a wireless charging earphone box, a metal rotating shaft on wireless charging electronic equipment and a method for reducing heating of the metal rotating shaft. The wireless charging earphone box is provided with an earphone box main body, an earphone box upper cover and a metal rotating shaft, an induction coil for wirelessly charging a battery of the earphone box is arranged in the earphone box main body, the earphone box upper cover is rotatably connected with the earphone box main body through the metal rotating shaft, and the metal rotating shaft comprises an upper rotating shaft assembly and a lower rotating shaft assembly. The upper rotating shaft assembly is clamped with the earphone box upper cover, the lower rotating shaft assembly is clamped with the earphone box main body, and the upper rotating shaft assembly and / or the lower rotating shaft assembly of the metal rotating shaft are / is provided with a hollow structure. Preferably, the edge of the upper rotating shaft assembly and / or the lower rotating shaft assembly of the metal rotating shaft is provided with a slotting structure. Different from the existing technical scheme, the embodiment of the invention can solve the problem of heating of the metal rotating shaft during wireless charging only by optimizing the structural design of the metal rotating shaft.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a wireless charging earphone box, a metal rotating shaft on a wireless charging electronic device, and a method for reducing the heat generation thereof. Background Art

[0002] As an audio output device, earphones are widely used in people's daily lives, and for various audio playback devices, earphones have become an indispensable electronic device. Existing earphones mainly include two forms, namely wired earphones and wireless earphones. Since wireless earphones are free from the constraints of headphone cables, they are lightweight and easy to carry, and have high compatibility, they are favored by consumers. The mainstream wireless earphones are Bluetooth earphones, which are stored and charged by placing them in an earphone box. The earphone box is also a rechargeable device and needs to be charged frequently to maintain daily use. Traditional earphone boxes require a charging cable for wired charging, and frequent plugging and unplugging can easily damage the interface of the charging cable. Currently, more and more earphone boxes are equipped with wireless charging technology.

[0003] For consumer electronic products such as wireless headphones, wireless charging has the advantages of strong waterproofness, convenient operation, and strong versatility. In principle, wireless charging is mainly divided into three categories, including electromagnetic induction, magnetic resonance, and radio wave. Electromagnetic induction is a relatively mature method of wireless charging. The principle of electromagnetic induction wireless charging is similar to that of a transformer. It contains two induction coils at the transmitter and the receiver. The transmitter coil is connected to a wired power supply to generate an electromagnetic signal. The receiver coil receives the electromagnetic signal from the transmitter through electromagnetic induction to generate alternating current, and converts the alternating current into direct current to charge the battery. However, during the wireless charging process, there are problems of electromagnetic interference to electronic equipment, as well as problems such as unexpected heating of other metal parts in the surrounding environment except the induction coil due to eddy current loss and hysteresis loss, which affects the user experience and causes a decrease in wireless charging efficiency and power loss.

[0004] In order to improve charging efficiency and ensure safety, the current mainstream solution is to attach absorbing materials such as magnetic isolation sheets to the back of the transmitter coil and the receiver coil of the wireless charger. First, it uses its excellent magnetic conductivity to gather and concentrate the magnetic lines, that is, to allow the electromagnetic power of the transmitter coil to act on the receiver coil as much as possible to improve the conversion efficiency; second, it can effectively block the magnetic field and reduce the loss and heat generated by the circuit board and electronic devices above the receiver coil. However, the magnetic field range generated by the transmitter coil is large. Although its peripheral magnetic field strength is low, it will still cause the metal parts around the electronic products to generate eddy current loss and hysteresis loss, thereby generating heat and even triggering the temperature protection mechanism to reduce the charging speed.

[0005] In the current mainstream wireless charging earphone boxes, the receiving coil is set on the back side of the earphone box body, and the metal shaft is set at the upper position of the back side for connecting the upper cover of the earphone box. In order to improve the conversion efficiency, the receiving coil area is as large as possible, which inevitably makes it closer to the metal shaft above. When the earphone box is wirelessly charged, the metal shaft generates eddy currents and hysteresis losses in the changing magnetic field, which cause the earphone box to heat up severely and reduce the charging efficiency through conduction and other means, resulting in a poor user experience.

[0006] In order to reduce the effect of heating caused by eddy current and hysteresis loss on the metal shaft during wireless charging of the earphone box, some products in the prior art can enhance the magnetic conductivity and magnetic shielding properties by increasing the thickness of wave-absorbing materials such as magnetic isolation sheets, thereby reducing the eddy current and hysteresis losses of the metal shaft located outside the receiving coil, but this will increase costs and cannot be implemented when the structural space is limited. Some products also reduce the heating power by reducing the area of ​​the receiving coil, but at the same time the charging efficiency is also greatly reduced. In addition, some products change the structural design to keep the metal shaft away from the center of the magnetic field. For example, the metal shaft is set on the back side of the earphone box body, and the receiving coil is set on the front side of the earphone box body. However, this structural design requires the earphone box to be placed on the wireless charging plate with the front side facing down and the back side facing up during charging, which will inevitably affect the user experience. Summary of the invention

[0007] The embodiments of the present invention provide a wireless charging earphone box, a metal shaft on a wireless charging electronic device, and a method for reducing the heat generation thereof. Different from the above-mentioned prior art solutions, the structure of the metal shaft is optimized to greatly reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field, thereby solving the problem of serious heating of the metal shaft during wireless charging.

[0008] According to a first aspect of the present invention, a wireless charging earphone box is provided, comprising an earphone box main body, an earphone box upper cover and a metal shaft, wherein the earphone box main body is provided with an induction coil for wirelessly charging a battery of the earphone box, the earphone box upper cover is rotatably connected to the earphone box main body via the metal shaft, wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, the upper shaft assembly is clamped to the earphone box upper cover, the lower shaft assembly is clamped to the earphone box main body, and the upper shaft assembly and / or the lower shaft assembly of the metal shaft are designed with a hollow structure.

[0009] Optionally, the edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are also designed with a groove structure.

[0010] Optionally, the upper edge of the upper rotating shaft assembly is designed with one or more slotted structures, the middle portion of the lower rotating shaft assembly is designed with a hollow structure, and the lower edge is also designed with a slotted structure.

[0011] Optionally, the metal shaft is made of weak magnetic material.

[0012] Optionally, the induction coil and the lower shaft component in the metal shaft are both arranged on the rear side of the earphone box body.

[0013] According to a second aspect of the present invention, a metal shaft on a wireless charging electronic device is provided, wherein the electronic device comprises a device body and a device cover, wherein the device body is provided with an induction coil for wirelessly charging a battery of the electronic device, and the device upper cover is rotatably connected to the device body via the metal shaft; wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, wherein the upper shaft assembly is used for clamping the device upper cover, and the lower shaft assembly is used for clamping the device body; and the upper shaft assembly and / or the lower shaft assembly of the metal shaft are designed with a hollow structure.

[0014] Optionally, the edge of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft is also designed with a groove structure.

[0015] Optionally, the metal shaft is made of weak magnetic material.

[0016] According to a third aspect of the present invention, a method for reducing the heating of a metal shaft on a wireless charging electronic device is provided, wherein the electronic device comprises a device body and a device upper cover, wherein the device body is provided with an induction coil for wirelessly charging a battery of the electronic device, and the device upper cover is rotatably connected to the device body via the metal shaft; wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, wherein the upper shaft assembly is used to clamp the device upper cover, and the lower shaft assembly is used to clamp the device body; the method comprises:

[0017] The upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed to have a hollow structure, and the edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed to have a slotted structure.

[0018] Optionally, the metal shaft is made of weak magnetic material.

[0019] The beneficial effects of the embodiments of the present invention are:

[0020] The wireless charging earphone box, the metal shaft on the wireless charging electronic device and the method for reducing the heat generation thereof provided by the present invention greatly reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field by optimizing the structural design of the metal shaft without increasing the thickness of the wave absorbing / magnetic isolation material, reducing the area of ​​the receiving end coil, and changing the relative position of the metal shaft and the induction coil. For example, the upper shaft component and / or the lower shaft component of the metal shaft is designed to have a hollow structure, which can effectively reduce the projection area S of the metal shaft in the magnetic field direction, thereby effectively reducing the eddy current loss; for another example, the edge of the upper shaft component and / or the lower shaft component of the metal shaft is designed to have a slotted structure, which is equivalent to increasing the internal resistance of the loop and increasing the eddy current loop impedance, which can greatly reduce the current density, thereby effectively reducing the eddy current loss; at the same time, the metal shaft is hollowed out and slotted, which can also effectively reduce the overall volume of the metal shaft, thereby effectively reducing the hysteresis loss from another aspect. It can be seen that the embodiments of the present invention are different from the prior art solutions in that they can solve the problem of heating of the metal shaft during wireless charging only by optimizing the structural design of the metal shaft, without increasing costs, reducing charging efficiency, or affecting user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings. In the drawings:

[0022] Figure 1 It is a schematic diagram of the principle of eddy current loss in alternating magnetic field;

[0023] Figure 2 A schematic diagram of the simulation of the current size and flow direction for the hollowing-out design of the middle of a metal component;

[0024] Figure 3 A simulation diagram of the current size and flow direction for a metal component with a hollowed-out center and slotted edges;

[0025] Figure 4 A perspective view of a wireless charging earphone box provided by one embodiment of the present invention is shown;

[0026] Figure 5 A schematic projection diagram of various components of a metal shaft provided by an embodiment of the present invention is shown;

[0027] Figure 6 It shows a schematic structural diagram of the metal shaft components provided by one embodiment of the present invention being assembled together;

[0028] Figure 7A schematic structural diagram of a wireless charging electronic device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. These embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0030] Electromagnetic induction wireless charging contains two induction coils, a transmitter and a receiver. The transmitter coil is connected to a wired power supply to generate an electromagnetic signal, that is, a sinusoidal magnetic field is generated around the sinusoidal alternating current; the receiver coil receives the electromagnetic signal from the transmitter through electromagnetic induction.

[0031] When the metal is in an alternating magnetic field, the total loss PT during the alternating magnetization process includes eddy current loss Pe and hysteresis loss P h And residual loss. In wireless charging, the proportion of residual loss within 100kHz is extremely low and can be ignored. The total loss P T Equal to P e and P h sum:

[0032] P T =P e +P h

[0033] 1. Eddy current loss

[0034] The interior of a metal can be equivalent to many closed circuits. When it is in an alternating magnetic field, the magnetic flux passing through these closed circuits is changes, an induced electromotive force ε will be generated. According to Faraday's law of electromagnetic induction, (In the formula is the rate of change of the total magnetic flux). At this time, an induced current will be generated in the closed circuit, and this induced current will close in the metal and appear in a vortex shape. When the eddy current flows through the internal resistance R, a large amount of heat is generated and released.

[0035] Figure 1 Schematic diagram of the principle of eddy current loss in alternating magnetic field. Figure 1 In the figure, there is a circular coil with an area of ​​S and a radius of r at the top, and a sinusoidal alternating current with a frequency of f flows in a clockwise direction; there is a metal plate directly below, which induces eddy currents flowing in a counterclockwise direction.

[0036] According to the magnetic flux Definition, (Where B is the magnetic induction intensity, S is the projection area of ​​the metal plate in the direction of the magnetic field).

[0037] Since sinusoidal alternating current produces a sinusoidal alternating magnetic field, B = B m ×e jωt (Where B m is the peak value of the magnetic field, angular frequency ω=2πf).

[0038] Eddy current loss instantaneous power:

[0039]

[0040] Average power of eddy current loss:

[0041]

[0042] Furthermore, according to the law of resistance:

[0043] Internal resistance R = ρl / s (where ρ is resistivity, l is length, and s is cross-sectional area)

[0044] The alternating magnetic field will cause eddy currents inside the conductor, and the current distribution on the conductor cross section is no longer uniform. At this time, the current will mainly concentrate on the surface of the conductor. This effect is called the skin effect, and the higher the frequency of the current, the more obvious the skin effect. At this time, the skin effect needs to be considered, and the skin depth δ is used to calculate the effective cross section:

[0045] (where μ is magnetic permeability)

[0046] The eddy current directly below the projected area of ​​the energized coil is calculated as follows:

[0047]

[0048] So there is Substituting the average power expression of eddy current loss into the formula, we can get:

[0049] Eddy current loss average power

[0050] From the above results, we can see that when f, B m When the values ​​of μ are determined, the eddy current loss can be effectively reduced by reducing the projection area S of the metal in the direction of the magnetic field or increasing the resistivity ρ.

[0051] Figure 2 This is a simulation diagram of the current size and flow direction of the hollow design in the middle of the metal component. Figure 3 A simulation diagram of the current size and flow direction when the middle of a metal component is hollowed out and grooves are added to the edges. Figure 2 and Figure 3 The direction of the arrow in the middle represents the direction of current flow, and the length of the arrow corresponds to the magnitude of the current. It can be seen that there is an obvious skin effect in the direction of metal thickness.

[0052] For wireless charging electronic products, when designing metal parts, hollowing out the middle as much as possible while taking into account the strength can effectively reduce the projection area S of the metal parts in the magnetic field direction; at the same time, choosing materials with a larger resistivity ρ can effectively reduce eddy current losses. Figure 2 and Figure 3 From the simulation results, it can be seen that adding a slotted structure on the basis of the hollow structure is equivalent to increasing the internal resistance of the loop, that is, increasing the impedance of the eddy current loop, which can greatly reduce the current density and reduce the eddy current loss.

[0053] 2. Hysteresis loss

[0054] When the metal in the alternating magnetic field is a magnetic material, hysteresis will occur due to repeated magnetization. Hysteresis refers to the phenomenon that when its magnetic state changes, the magnetization intensity lags behind the external magnetic field intensity, and the magnetic field intensity H and the magnetic flux density B show a hysteresis loop relationship. The energy consumed by hysteresis is called hysteresis loss P. h .

[0055] The mechanism of hysteresis loss is that the magnetic pole direction of the small magnetic domain inside the metal is repeatedly twisted, causing the magnetic domains to collide continuously, and the hysteresis loss is converted into heat, thereby heating up the metal parts. After one cycle, the hysteresis loss per unit volume P h Proportional to the area enclosed by the hysteresis loop.

[0056] According to the Steinmetz empirical formula applicable to engineering calculation of hysteresis loss:

[0057] Hysteresis loss per unit volume P v =C m ×f α ×B β (C m , α and β are empirical parameters, which depend on the material properties and other relevant factors and are applicable to sinusoidal magnetization.

[0058] Then the total hysteresis loss P h =∫∫∫P v ×dV (V is the total volume).

[0059] From the above results, it can be seen that when the values ​​of f and B are determined, reducing the total volume V can effectively reduce the hysteresis loss P h For example, hollowing out and / or grooving metal parts can reduce their volume. In addition, hysteresis loss is obviously also related to the material properties. Materials with very weak magnetic properties such as paramagnetic / diamagnetic / soft magnetic properties can be selected, such as aluminum alloy, copper alloy or stainless steel. The hysteresis loss generated by these materials can be ignored.

[0060] Based on the above theoretical derivation and simulation results, the present invention provides a wireless charging earphone box, a metal shaft on a wireless charging electronic device, and a method for reducing the heat generation thereof.

[0061] Figure 4 FIG. 1 shows a perspective view of a wireless charging earphone box provided by an embodiment of the present invention. Figure 5 FIG. 1 shows a schematic projection diagram of various components of a metal shaft provided by an embodiment of the present invention. Figure 6 A schematic structural diagram of the metal shaft components provided by an embodiment of the present invention is shown.

[0062] See also Figures 4 to 6 A wireless charging earphone box provided by an embodiment of the present invention comprises an earphone box main body 1, an earphone box upper cover (not shown in the figure) and a metal shaft 3, wherein the earphone box main body 1 is provided with an induction coil 2 for wirelessly charging the battery of the earphone box, the earphone box upper cover is rotatably connected to the earphone box main body 1 through the metal shaft 3, wherein the metal shaft 3 comprises an upper shaft component 3a and a lower shaft component 3c, the upper shaft component 3a is clamped to the earphone box upper cover, and the lower shaft component 3c is clamped to the earphone box main body 1, and the upper shaft component 3a and / or the lower shaft component 3c of the metal shaft 3 are roughly flat and designed with a hollow structure.

[0063] The distribution position, area size and number of hollows of the hollow structure need to take into account the strength and function of the metal shaft 3. The metal shaft 3 serves as a rotation connection mechanism between the upper cover of the earphone box and the main body 1 of the earphone box, and includes at least two parts: an upper shaft component 3a and a lower shaft component 3c. The hollow structure can be designed separately in the upper shaft component 3a, or separately in the lower shaft component 3c, or simultaneously in the upper shaft component 3a and the lower shaft component 3c. By designing a hollow structure in the upper shaft component 3a and / or the lower shaft component 3c of the metal shaft 3, the projection area S of the metal shaft in the magnetic field direction can be effectively reduced, thereby effectively reducing eddy current losses.

[0064] In a preferred embodiment, a slotted structure can be further designed on the edge of the upper shaft component 3a and / or the lower shaft component 3c of the metal shaft 3. The distribution position, slot size and number of slots of the slotted structure also need to take into account the strength and function of the metal shaft 3. The slotted structure can be designed separately on the upper shaft component 3a, or separately on the lower shaft component 3c, or simultaneously on the upper shaft component 3a and the lower shaft component 3c. By designing the slotted structure on the upper shaft component 3a and / or the lower shaft component 3c of the metal shaft 3, the projected area S of the metal shaft in the magnetic field direction is reduced, and at the same time, it is equivalent to increasing the internal resistance of the loop, that is, increasing the impedance of the eddy current loop, which can greatly reduce the current density and reduce the eddy current loss.

[0065] In addition, a hollow structure and / or a slotted structure is designed on the upper shaft assembly 3a, and / or a hollow structure and / or a slotted structure is designed on the lower shaft assembly 3c. The hollowing and slotting operations can also effectively reduce the overall volume of the metal shaft 3, thereby effectively reducing the hysteresis loss from another aspect.

[0066] See also Figure 5 and Figure 6 In addition to an upper shaft assembly 3a and a lower shaft assembly 3c, wherein the upper shaft assembly 3a is used to snap into the upper cover of the earphone box, and the lower shaft assembly 3c is used to snap into the main body of the earphone box, in order to realize the rotational connection between the upper and lower shaft assemblies, the metal shaft 3 also includes a pin 3b and a metal spring 3d, wherein the upper shaft assembly 3a and the lower shaft assembly 3c are combined together by the pin 3b, and the metal spring 3d is supported between the upper and lower shaft assemblies to provide elastic force for the rotational connection between the two.

[0067] In a preferred embodiment, the upper edge of the upper shaft component 3a is designed with one or more slotted structures, the middle of the lower shaft component 3c is designed with a hollow structure, and the lower edge is also designed with a slotted structure. Considering that the upper shaft component 3a in the metal shaft 3 bears more rotational force than the lower shaft component 3c, only the slotted structure can be designed on the upper shaft component 3a, and the hollow structure and the slotted structure can be designed on the lower shaft component 3c at the same time.

[0068] See Figure 5 and Figure 6 As shown, the upper edge of the upper shaft assembly 3a is designed with two slotted structures 310 and 320, which are far away from the left and right edges of the upper shaft assembly 3a and are symmetrically distributed relative to the mid-perpendicular line 300 of the upper shaft assembly 3a. Such a double slotted structure design can not only take into account the strength of the upper shaft assembly 3a, but also effectively reduce the eddy current loss and hysteresis loss of the upper shaft assembly 3a.

[0069] Still see Figure 5 and Figure 6 As shown, a hollow structure 330 is designed in the middle of the lower rotating shaft assembly 3c, and a slotted structure 340 is also designed on one side of the lower edge. Figure 6In the figure, after the metal shaft components are assembled together, the pin 3b is no longer visible from the outside, while the metal spring 3d becomes visible from the outside due to the hollow structure 330. Considering that most of the structure of the lower shaft component 3c is connected to the earphone box body 1, hollowing out the middle part of the lower shaft component 3c will not particularly affect the strength of the lower shaft component 3c. In addition, the slotted structure 340 is designed on one side of the lower edge of the lower shaft component 3c rather than in the middle, which also takes into account the strength of the lower shaft component 3c. The hollow structure 330 reduces the projected area S of the lower shaft component 3c in the magnetic field direction, which can effectively reduce eddy current losses; the slotted structure 340 is equivalent to increasing the internal resistance of the loop, increasing the eddy current loop impedance, which can greatly reduce the current density and reduce eddy current losses; and the hollow structure 330 and the slotted structure 340 can also reduce the total volume of the lower shaft component 3c, effectively reducing hysteresis losses.

[0070] In another embodiment, the metal shaft 3 is made of weak magnetic material. Since the hysteresis loss is related to the material properties, materials with very weak magnetic properties such as paramagnetic / diamagnetic / soft magnetic properties are selected, such as aluminum alloy, copper alloy, etc. The hysteresis loss generated by these materials can be ignored, but it will correspondingly bring about problems such as a significant increase in cost and difficulty in processing. In addition, the metal shaft 3 is made of a material with a larger resistivity ρ, which can also effectively reduce eddy current losses. Considering that aluminum alloy / copper alloy materials have excellent electrical conductivity, and eddy current loss is related to resistivity, the resistivity of aluminum / copper is very small, so it is impossible to effectively improve the heat caused by eddy current loss. In addition, the material and processing costs of aluminum alloy / copper alloy materials are higher. Therefore, stainless steel can be selected as the material of the metal shaft 3, and based on the structural design given in the solution of the present invention, it can take into account both cost and strength, and can also reduce hysteresis loss and eddy current loss to a certain extent.

[0071] It should also be noted that, in order to reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field, thereby solving the problem of heating of the metal shaft during wireless charging, the focus of the various embodiments of the present invention is to improve the structure of the metal shaft, and no requirements or changes are made to the setting position of the metal shaft. For example, in one embodiment of the present invention, the induction coil 2 and the lower shaft component 3c in the metal shaft 3 can be set on the rear side of the earphone box body 1, which is completely consistent with the relative position of the receiving end coil and the metal shaft in the current mainstream wireless charging earphone box.

[0072] To sum up, the wireless charging earphone box provided by the present invention is different from the existing technical solutions. It does not increase the thickness of the wave-absorbing / magnetic isolation material, does not reduce the area of ​​the receiving end coil, and does not change the relative position of the metal shaft. It only optimizes the structural design of the metal shaft. It can greatly reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field, solve the problem of heating of the metal shaft during wireless charging, and will not increase costs, reduce charging efficiency, or affect user experience.

[0073] Figure 7 A schematic diagram of the structure of a wireless charging electronic device according to an embodiment of the present invention is shown. Figure 7 As shown, the electronic device includes an induction coil, a battery, a metal shaft, a device body and a device upper cover, wherein the induction coil is arranged in the device body for wirelessly charging the battery, and the device upper cover is rotatably connected to the device body through the metal shaft. It is easy to understand that, at the hardware level, the electronic device should also include a processor, a memory storing computer program instructions, and if necessary, the electronic device may also include a display panel, a communication module, etc.

[0074] The metal shaft is mechanically connected between the device body and the device cover. The induction coil, battery, device body, processor and memory can be interconnected through an internal bus, which can be an ISA (Industry Standard Architecture) bus, PCI (Peripheral Component Interconnect) bus or EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0075] Belonging to the same technical concept as the aforementioned wireless charging earphone box, an embodiment of the present invention provides a metal shaft on a wireless charging electronic device, including an upper shaft assembly and a lower shaft assembly, the upper shaft assembly is used to clamp the upper cover of the device, the lower shaft assembly is used to clamp the device body, and the upper shaft assembly and / or the lower shaft assembly of the metal shaft are designed with a hollow structure.

[0076] Preferably, the edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are also designed with a groove structure.

[0077] Further preferably, the metal shaft is made of weak magnetic material.

[0078] Referring to the above-mentioned wireless charging headset box embodiment, the metal shaft embodiment of the wireless charging electronic device provided by the present invention can significantly reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field, and solve the problem of heating of the metal shaft during wireless charging of the electronic device, without increasing the cost, reducing the charging efficiency, and affecting the user experience. No further details will be given here.

[0079] The method for reducing the heating of the metal shaft on a wireless charging electronic device provided by an embodiment of the present invention is the same as the aforementioned wireless charging earphone box. By designing the upper shaft component and / or the lower shaft component of the metal shaft to have a hollow structure, and designing the edge of the upper shaft component and / or the lower shaft component of the metal shaft, the metal shaft can be further selected from weak magnetic materials and other means to greatly reduce the eddy current loss and hysteresis loss generated in the metal shaft by the induced magnetic field, thereby solving the problem of heating of the metal shaft during wireless charging of the electronic device without increasing costs, reducing charging efficiency, and affecting user experience. It will not be described in detail here.

[0080] Finally, it should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0081] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A wireless charging earphone box, comprising an earphone box body, an earphone box cover and a metal shaft, wherein the earphone box body is provided with an induction coil for wirelessly charging a battery of the earphone box, the earphone box cover is rotatably connected to the earphone box body through the metal shaft, wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, the upper shaft assembly is clamped to the earphone box cover, and the lower shaft assembly is clamped to the earphone box body, characterized in that: The upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed with a hollow structure.

2. The wireless charging earphone box according to claim 1, characterized in that: The edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are also designed with a slotted structure.

3. The wireless charging earphone box according to claim 2, characterized in that: The upper edge of the upper rotating shaft component is designed with one or more slotted structures, the middle part of the lower rotating shaft component is designed with a hollow structure, and the lower edge is also designed with a slotted structure.

4. The wireless charging earphone box according to any one of claims 1 to 3, characterized in that: The metal shaft is made of weak magnetic material.

5. The wireless charging earphone box according to any one of claims 1 to 3, characterized in that: The induction coil and the lower shaft component in the metal shaft are both arranged on the rear side of the earphone box body.

6. A metal shaft on a wireless charging electronic device, the electronic device comprising a device body and a device upper cover, the device body is provided with an induction coil for wireless charging of a battery of the electronic device, the device upper cover is rotatably connected to the device body through the metal shaft; wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, the upper shaft assembly is used to clamp the device upper cover, and the lower shaft assembly is used to clamp the device body; characterized in that: The upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed with a hollow structure.

7. The metal shaft according to claim 6, characterized in that: The edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are also designed with a slotted structure.

8. The metal shaft according to claim 6 or 7, characterized in that: The metal shaft is made of weak magnetic material.

9. A method for reducing the heating of a metal shaft on a wireless charging electronic device, the electronic device comprising a device body and a device upper cover, the device body is provided with an induction coil for wireless charging of a battery of the electronic device, the device upper cover is rotatably connected to the device body through the metal shaft; wherein the metal shaft comprises an upper shaft assembly and a lower shaft assembly, the upper shaft assembly is used to clamp the device upper cover, and the lower shaft assembly is used to clamp the device body; characterized in that The method comprises: The upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed to have a hollow structure, and the edges of the upper rotating shaft component and / or the lower rotating shaft component of the metal rotating shaft are designed to have a slotted structure.

10. The method according to claim 9, characterized in that: The method further comprises: The metal shaft is made of weak magnetic material.

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