Protective shell

Abstract

The utility model provides a protective shell which is used for protecting electronic equipment with a wireless charging function, the protective shell comprises a shell and a support made of a metal material, the support is provided with an opening, so that the projection shape of the support in the thickness direction of the support is C-shaped, the wire surrounding area and the electric field intensity of the support are reduced, and the reliability of the support is improved. The power loss at the bracket in the wireless charging process of the mobile phone is reduced, and the risk that the bracket is identified as a metal foreign body by an FOD system is reduced; the outer surface of the support is covered with the oxidation insulating layer, and the thickness of the oxidation insulating layer is larger than or equal to 50 microns, so that the circulation area of eddy current in the support is reduced, the overall resistance of the support is increased, the power loss of the support in the wireless charging process of a mobile phone is reduced, and the risk that the support is recognized as a metal foreign matter by an FOD system is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic device protective cases, and in particular to a protective case. BACKGROUND

[0002] The protective case is used to be sleeved on an electronic device such as a mobile phone or a tablet computer, and is used to protect the device and reduce the risk of damage to the back, side frame or other positions of the device due to bumping or other problems. A support is arranged on the protective case, and the support can be switched between a storage state and a supporting state. When the support is in the supporting state, the device can be supported at a specific angle to meet the daily use requirements of the device.

[0003] In order to improve the structural strength of the support, the material of the support is usually metal. However, during wireless charging of the electronic device, the support made of metal material will generate an electromotive force under the action of an alternating magnetic field, and the support will consume part of the energy, thereby reducing the efficiency of wireless charging of the electronic device.

[0004] In addition, a foreign object detection (FOD) system is arranged on the mobile phone. The FOD system detects the actual charging power during charging of the mobile phone, compares the actual charging power with a theoretical charging power, calculates a power difference value, compares the power difference value with an FOD threshold, and if the power difference value is equal to or greater than the FOD threshold, it is determined that there is a metal foreign object that generates heat abnormally between the mobile phone and the wireless charger. In order to reduce the damage of the high temperature of the metal foreign object to the mobile phone, the FOD system will degrade the charging power of the mobile phone or even stop charging of the mobile phone. During wireless charging of the mobile phone, if the mobile phone is worn with the above protective case with a metal support, the efficiency of wireless charging of the mobile phone 01 is reduced due to the support 2, thereby increasing the power difference value calculated by the FOD system, and the risk of the FOD system identifying the support as a metal foreign object is high. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a protective case which can reduce the risk of the support being identified as a metal foreign object by the FOD system during wireless charging.

[0006] The first aspect of the present application provides a protective case for protecting an electronic device with a wireless charging function. The protective case comprises a shell and a support. The support is mounted on the shell, and the material of the support is metal. The support is provided with an opening, so that the projection shape of the support along the thickness direction of the support is C-shaped. An oxidation insulating layer covers the outer surface of the support, and the thickness of the oxidation insulating layer is greater than or equal to 50 μm.

[0007] In the present application, the support is adjusted to a C-shaped support, which reduces the perimeter area of the support, thereby reducing the electric field intensity in the support, so that the heating power of the support is reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage of the support due to overheating and even damaging the mobile phone; in addition, the heating power of the support is reduced, which reduces the power loss at the support during the wireless charging of the mobile phone, thereby reducing the required power of the wireless charger, and reducing the difference between the actual charging power and the theoretical charging power of the mobile phone, thereby reducing the risk of the support being identified as a metal foreign object by the FOD system, so as to improve the stability of the wireless charging of the mobile phone.

[0008] Without changing the overall size of the support, the thickness of the oxidation insulating layer on the surface of the support is increased, that is, the circulation area of the eddy current in the support is reduced, so that the overall resistance of the support is increased, thereby reducing the heating power of the support, reducing the power loss at the support during the wireless charging of the mobile phone, thereby reducing the required power of the wireless charger, and reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0009] In a possible design, the protective shell further includes a rotating shaft, and the support is connected with the shell body through the rotating shaft; the support is provided with a gap, and at least part of the rotating shaft is located in the gap; the opening is arranged on one side of the support close to the gap in the radial direction of the support, and the opening is in communication with the gap.

[0010] In the present application, the opening is hidden at the rotating shaft, which reduces the risk of the user being injured or damaging other objects in the external environment when the opening is exposed on the outside when the support is in the supporting state, and also improves the hand feeling of the user when rotating the support.

[0011] In a possible design, the electronic device has a first coil, and the wireless charger of the electronic device has a second coil; during the wireless charging of the electronic device, there is a weak magnetic field region at the edge of the first coil and the second coil; when the support is in the storage state, the projection area of the support in the thickness direction of the support is S1, and the overlapping area of the support and the weak magnetic field region is S2, and S2 / S1≥70%.

[0012] In the present application, at least part of the support is coincided with the weak magnetic field region, which can reduce the magnetic field intensity at the position of the support, so that the electromotive force in the support is reduced, so that the heating power of the support is reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage of the support due to overheating and even damaging the mobile phone, and further reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0013] S2 / S1≥70% can further reduce the temperature of the support, thereby further reducing the risk of damage of the support due to overheating and even damaging the mobile phone, and further reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0014] In a possible design, the weak magnetic field region includes a first magnetic field region and a second magnetic field region, the first magnetic field region is located at an edge of the first coil, and the second magnetic field region is located at an edge of the second coil during wireless charging of the electronic device; and the area of overlap between the support and the first magnetic field region along the thickness direction of the support is S2 when the support is in the storage state.

[0015] In the application, the area of overlap between the support and the first magnetic field region is S2, so that the mobile phone and the protective case are suitable for wireless chargers of different brands, thereby increasing the range of wireless chargers that can be selected for the mobile phone with the protective case.

[0016] In a possible design, the outer surface of the support includes a first surface, a second surface and a third surface, the first surface and the third surface are oppositely arranged along the radial direction of the support, and the second surface is located on the side of the support away from the shell along the thickness direction of the support; the support further includes a first chamfer connecting the first surface and the second surface, and / or the support further includes a second chamfer connecting the second surface and the third surface.

[0017] In the application, the chamfer is arranged at the edge of the support, so that the cross-sectional area of the support is reduced, the resistance of the support is increased, the heat generation power is reduced, the temperature of the support is reduced, and the risk of damage of the support due to excessively high temperature or damage of the mobile phone is reduced. In addition, the power loss at the support during wireless charging of the mobile phone is reduced, and the risk of the support being identified as a metal foreign object by the FOD system is reduced.

[0018] In a possible design, the support is internally provided with a cavity, and the cavity is filled with a heat-conducting medium.

[0019] In the application, the heat-conducting medium can improve the temperature transfer speed of the support, so that the support can be quickly cooled, thereby reducing the risk of damage of the support due to excessively high temperature or damage of the mobile phone.

[0020] In a possible design, the support includes a first temperature region and a second temperature region, the temperature of the first temperature region is higher than that of the second temperature region during wireless charging of the electronic device; the heat-conducting medium is graphene, and the cavity at the first temperature region and the cavity at the second temperature region are both filled with graphene; or the heat-conducting medium includes graphene and heat-conducting glue, and the cavity at the second temperature region is filled with graphene or heat-conducting glue.

[0021] In the present application, the cavities at the first heat generating area and the second heat generating area are filled with graphene, which can improve the overall heat dissipation effect of the support. Filling the cavities at the first heat generating area with graphene and filling the cavities at the second heat generating area with heat-conducting glue can improve the heat dissipation effect at the first heat generating area, reduce the maximum temperature of the support, and facilitate the installation of other parts in the support, thereby improving the integration of the support.

[0022] In a possible design, the material of the support is 6013 aluminum alloy or 7075 aluminum alloy.

[0023] In the present application, the resistivity of 6013 aluminum alloy and 7075 aluminum alloy is relatively large. The larger the resistivity, the greater the resistance of the support, and the smaller the heat generating power of the support. By increasing the resistivity of the support, the heat generating power of the support can be reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage to the support due to excessively high temperature and even damage to the phone. In addition, the power loss at the support during the wireless charging process of the phone is reduced, and the risk of the support being identified as a metal foreign object by the FOD system is reduced.

[0024] In a possible design, the shell is provided with an identification module. The identification module is used to transmit a signal to an identification module on the electronic device to adjust a metal foreign object identification threshold on the electronic device from a first threshold to a second threshold.

[0025] In the present application, the identification module can determine that the phone is in a case state according to the received signal, and adjust the FOD threshold on the phone from the first threshold to the second threshold. The first threshold is smaller than the second threshold. The risk of the support made of metal material being identified as a metal foreign object by the FOD system is reduced, and the stability of the wireless charging of the phone is improved.

[0026] In a possible design, the identification module is a magnet or an NFC chip.

[0027] In the present application, the identification module is a magnet or an NFC chip, which reduces the difficulty of identifying the protective case by the phone, thereby facilitating the simplification of the structure of the protective case and reducing the cost and size of the protective case.

[0028] The second aspect of the present application provides a protective case for protecting an electronic device with wireless charging function. The electronic device has a first coil, and the wireless charger of the electronic device has a second coil. During the wireless charging process of the electronic device, there is a weak magnetic field region at the edge of the first coil and the second coil. The protective case includes a shell and a support. The support is installed on the shell, and the material of the support is metal. When the support is in the storage state, the projection area of the support along the thickness direction of the support is S1, and the overlapping area of the support and the weak magnetic field region is S2. S2 / S1≥70%.

[0029] In the present application, at least part of the support is coincided with the weak magnetic field area, which can reduce the magnetic field strength of the position where the support is located, and then the electromotive force in the support is reduced, so that the heat power of the support is reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage of the support due to high temperature and even damaging the mobile phone, and further reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0030] S2 / S1 is greater than or equal to 70%, which can further reduce the heat power of the support, thereby further reducing the risk of damage of the support due to high temperature and even damaging the mobile phone, and further reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0031] In a possible design, the weak magnetic field area includes a first magnetic field area and a second magnetic field area, and during wireless charging of the electronic device, the first magnetic field area is located at the edge of the first coil, and the second magnetic field area is located at the edge of the second coil; when the support is in the storage state, the overlapping area of the support and the first magnetic field area along the thickness direction of the support is S2.

[0032] In the present application, the overlapping area of the support and the first magnetic field area is S2, so that the mobile phone and the protective case are adapted to wireless chargers of different brands, thereby improving the range of wireless chargers that can be selected for the mobile phone with the above protective case.

[0033] In a possible design, the support is provided with an opening, so that the projection shape of the support along the thickness direction of the support is C-shaped.

[0034] In the present application, the support is adjusted to be a C-shaped support, which reduces the perimeter area of the support, thereby reducing the electric field strength in the support, so that the heat power of the support is reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage of the support due to high temperature and even damaging the mobile phone; in addition, the heat power of the support is reduced, which reduces the power loss at the support during wireless charging of the mobile phone, thereby reducing the required power of the wireless charger, and reducing the difference between the actual charging power and the theoretical charging power of the mobile phone, and reducing the risk of the support being identified as a metal foreign object by the FOD system, so as to improve the stability of wireless charging of the mobile phone.

[0035] In a possible design, the protective case further includes a rotating shaft, and the support is connected with the shell through the rotating shaft; the support is provided with a notch, and at least part of the rotating shaft is located in the notch; along the radial direction of the support, the opening is arranged on the side of the support close to the notch, and the opening is in communication with the notch.

[0036] In the present application, the opening is hidden at the rotating shaft, which reduces the risk of the opening being exposed outside when the support is in the supporting state, thereby reducing the risk of injury to the user or damage to other objects in the external environment, and improving the hand feeling of the user when rotating the support.

[0037] In a possible design, the outer surface of the support includes a first surface, a second surface and a third surface, the first surface and the third surface are arranged opposite along the radial direction of the support, and the second surface is located on the side of the support away from the shell along the thickness direction of the support; the support further includes a first chamfer connecting the first surface and the second surface, and / or the support further includes a second chamfer connecting the second surface and the third surface.

[0038] In the present application, the chamfer is arranged at the edge of the support, which can reduce the cross-sectional area of the support, thereby increasing the resistance of the support and reducing the heat generation power, that is, reducing the temperature of the support, thereby reducing the risk of damage of the support due to excessively high temperature and even damage of the mobile phone. In addition, the power loss at the support during the wireless charging of the mobile phone is reduced, and the risk of the support being identified as a metal foreign object by the FOD system is reduced.

[0039] In a possible design, the support is internally provided with a cavity, and the cavity is filled with a heat-conducting medium.

[0040] In the present application, the heat-conducting medium can improve the temperature transfer speed of the support, so that the support can be quickly cooled to reduce the risk of damage of the support due to excessively high temperature and even damage of the mobile phone.

[0041] In a possible design, the support includes a first temperature region and a second temperature region, and the temperature of the first temperature region is higher than that of the second temperature region during the wireless charging of the electronic device; the heat-conducting medium is graphene, and the cavity at the first temperature region and the cavity at the second temperature region are both filled with graphene; or the heat-conducting medium includes graphene and heat-conducting glue, and the cavity at the second temperature region is filled with graphene or heat-conducting glue.

[0042] In the present application, the cavity at the first heat generation region and the cavity at the second heat generation region are both filled with graphene, which can improve the overall heat dissipation effect of the support. The cavity at the first heat generation region is filled with graphene, and the cavity at the second heat generation region is filled with heat-conducting glue. The graphene can improve the heat dissipation effect at the first heat generation region, so that the maximum temperature of the support is reduced, and the heat-conducting glue can facilitate the installation of other parts in the support, thereby facilitating the improvement of the integration of the support.

[0043] In a possible design, the material of the support is 6013 aluminum alloy or 7075 aluminum alloy.

[0044] In the present application, the resistivity of the 6013 aluminum alloy and the 7075 aluminum alloy is large, the larger the resistivity, the greater the resistance of the support, the smaller the heating power of the support, by increasing the resistivity of the support, the heating power of the support can be reduced, that is, the temperature of the support is reduced, thereby reducing the risk of damage of the support due to too high temperature and even damage of the mobile phone, in addition, reducing the power loss at the support during the wireless charging process of the mobile phone, and reducing the risk of the support being identified as a metal foreign object by the FOD system.

[0045] In a possible design, the outer surface of the support is covered with an oxidation insulating layer, and the thickness of the oxidation insulating layer is greater than or equal to 50 microns.

[0046] In the present application, without changing the overall size of the support, the thickness of the oxidation insulating layer on the surface of the support is increased, that is, the flow area of the eddy current in the support is reduced, so that the overall resistance of the support is increased, thereby reducing the heating power of the support, reducing the power loss at the support during the wireless charging process of the mobile phone, and further reducing the required power of the wireless charger, and reducing the risk of the support 2 being identified as a metal foreign object by the FOD system.

[0047] In a possible design, the shell is provided with an identification module, and the identification module is used to transmit a signal to an identification module on the electronic device to adjust a metal foreign object identification threshold on the electronic device from a first threshold to a second threshold.

[0048] In the present application, the identification module can determine that the mobile phone is in a case state according to the received signal, and adjust the FOD threshold on the mobile phone from the first threshold to the second threshold, the first threshold is smaller than the second threshold, thereby reducing the risk of the support made of metal material being identified as a metal foreign object by the FOD system, and improving the stability of the wireless charging of the mobile phone.

[0049] In a possible design, the identification module is a magnet or an NFC chip.

[0050] In the present application, the identification module is a magnet or an NFC chip, which reduces the difficulty of the mobile phone to identify the protective case, thereby facilitating the simplification of the structure of the protective case, and reducing the cost and size of the protective case. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0052] Figure 1 The structural schematic diagram of the protective case in an embodiment;

[0053] Figure 2 Structure of the protective case in another embodiment;

[0054] Figure 3 Structure of the protective case in another embodiment;

[0055] Figure 4 Structure of the support in another embodiment;

[0056] Figure 5 Distribution of the mobile phone, the support and the wireless charger during the wireless charging process of the mobile phone;

[0057] Figure 6 Structure of the support in another embodiment;

[0058] Figure 7 Structure of the support in another embodiment;

[0059] Figure 8 Temperature variation of the ring-shaped support and the C-shaped support during the charging process of the mobile phone;

[0060] Figure 9 Distribution of the magnetic field during the charging process of the mobile phone;

[0061] Figure 10 Distribution of the first coil and the first magnetic field region;

[0062] Figure 11 Position of the support in the magnetic field in another embodiment;

[0063] Figure 12 Position of the support in the magnetic field in another embodiment;

[0064] Figure 13 Temperature variation of the support in the first position and the second position;

[0065] Figure 14 Cross-sectional profile of the support in another embodiment;

[0066] Figure 15 Cross-sectional profile of the support in another embodiment;

[0067] Figure 16 Sectional view of the local structure of the support;

[0068] Figure 17 Temperature region distribution of the support;

[0069] Figure 18 Cross-sectional structure of the support in another embodiment;

[0070] Figure 19 Structure diagram of the protection shell in another example.

[0071] Reference signs:

[0072] 01-mobile phone; 011-first coil;

[0073] 02-wireless charger;

[0074] 1-shell; 11-receiving groove;

[0075] 2-bracket; 21-gap; 22-opening; 23-first edge; 24-second edge; 25-third edge; 26-first surface; 27-second surface; 28-third surface; 29-chamfer; 291-first chamfer; 292-second chamfer; 2a-cavity; 2b-first heat generation area; 2c-second heat generation area; 2d-oxidation insulation layer;

[0076] 3-rotating shaft;

[0077] 4-weak magnetic field area; 41-first magnetic field area; 411-first edge position; 412-second edge position; 42-second magnetic field area;

[0078] 5-thermal conductive medium;

[0079] 6-identification module. DETAILED DESCRIPTION

[0080] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below in conjunction with the drawings.

[0081] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0082] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0083] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0084] The embodiment of the present application provides a protective shell for protecting an electronic device with a wireless charging function, the electronic device including but not limited to a mobile phone, a tablet and the like, and the embodiment of the present application takes the mobile phone with the wireless charging function as an example for description.

[0085] Figure 1 The structural schematic diagram of the protective shell in one example is shown in FIG. 1. Figure 1 As shown in FIG. 1, the protective shell includes a shell body 1, which is used for sleeving on the mobile phone to protect the mobile phone and reduce the risk of damage of the mobile phone due to knocking and the like at positions such as the back surface and the side frame.

[0086] As shown in FIG. 2, the shell body 1 is provided with a receiving groove 11. Figure 1 As shown in FIG. 2, the shell body 1 is provided with a receiving groove 11. Figure 2 The structural schematic diagram of the protective shell in another example is shown in FIG. 3. Figure 2 As shown in FIG. 3, the receiving groove 11 is provided with a support 2, and the support 2 is installed in the receiving groove 11 through a rotating shaft 3. The support 2 can rotate around the rotating shaft 3 to switch between a storage state and a supporting state. When the support 2 is in the storage state, the support 2 is stored in the receiving groove 11, and the thickness direction of the support 2 is parallel to the thickness direction of the shell body 1. Figure 3 The schematic diagram of the protective shell when the support is in the supporting state is shown in FIG. 4. Figure 3 The direction X1 in FIG. 4 represents the thickness direction of the shell body 1. Figure 3 X2 in FIG. 4 represents the thickness direction of the support 2. Figure 3 As shown in FIG. 4, when the support 2 is in the supporting state, at least part of the support 2 extends out of the receiving groove 11. At this time, there is a preset included angle between the thickness direction X2 of the support 2 and the thickness direction X1 of the mobile phone shell. At this time, the support 2 can support the shell body 1 and the mobile phone, thereby supporting the mobile phone at a specific angle.

[0087] Figure 4 The structural schematic diagram of the support in one example is shown in FIG. 5. Figure 4 As shown in FIG. 5, the support 2 is provided with a notch 21. Figure 2 At least part of the rotating shaft 3 in FIG. 5 is located in the notch 21 to reduce the space required for the installation of the support 2 on the shell body 1.

[0088] The support 2 needs to support the mobile phone, and the material of the support 2 is usually a metal material such as aluminum alloy, stainless steel, magnesium alloy, titanium alloy and zinc alloy to improve the structural strength of the support 2, thereby prolonging the service life and supporting stability of the support 2. In the embodiment of the present application, the material of the support 2 is aluminum alloy, which can improve the structural strength of the support 2 while reducing the weight of the support 2 to improve the portability of the protective shell.

[0089] The phone is equipped with a first coil for wireless charging, and the phone's wireless charger is equipped with a second coil for wireless charging. During wireless charging, the second coil generates an alternating magnetic field, which in turn generates an electromotive force in the first coil, thereby charging the battery.

[0090] Figure 5 Schematic diagram of the layout of the mobile phone, bracket and wireless charger during wireless charging of the mobile phone. During the process of wireless charging of the mobile phone, the bracket needs to be adjusted to the storage state. At this time, Figure 5 As shown, because bracket 2 is made of metal and is located between wireless charger 02 and mobile phone 01 along its thickness direction X2, at least a portion of bracket 2 is located within the alternating magnetic field. Under the influence of the alternating magnetic field, an electromotive force (EMF) is generated within bracket 2, forming eddy currents. This consumes some of the energy, reducing the efficiency of wireless charging for mobile phone 01. Furthermore, these eddy currents move within bracket 2 and perform work, causing the temperature of bracket 2 to rise. This poses a risk of damage to bracket 2, the protective case, and even mobile phone 01 due to abnormal bracket 2 temperatures.

[0091] In addition, the mobile phone is equipped with a Foreign Object Detection (FOD) system. The FOD system detects the actual charging power during the charging process of the mobile phone, compares the actual charging power with the theoretical charging power, calculates the power difference, and compares the power difference with the FOD threshold. If the power difference is equal to or greater than the FOD threshold, it is determined that there is a metal foreign object with abnormal heat generation between the mobile phone and the wireless charger. In order to reduce the damage to the mobile phone caused by the high temperature of the metal foreign object, the FOD system will downgrade the charging power of the mobile phone or even stop the charging of the mobile phone. During the wireless charging process of the mobile phone, if the mobile phone is wearing the above-mentioned protective case with a metal bracket, the bracket 2 reduces the efficiency of the wireless charging of the mobile phone 01, thereby increasing the power difference calculated by the FOD system. The risk of the FOD system identifying the bracket as a metal foreign object is high, and there is a risk that the power of the mobile phone with the case is low or even cannot be charged with the case.

[0092] In order to solve the problems of the bracket consuming too much power and having too high a temperature during wireless charging of the mobile phone, and the FOD system identifying the bracket as a metal foreign object, the embodiment of the present application adjusts the structure and material of the bracket to reduce the temperature and power of the bracket during wireless charging of the mobile phone.

[0093] In the first instance, Figure 4 The bracket 2 in the middle is adjusted from a ring shape to a C shape. Figure 6 FIG. 1 is a schematic diagram of the structure of a bracket in one embodiment, as shown in FIG. Figure 6As shown, the bracket 2 is provided with an opening 22, and the bracket 2 is disconnected at the opening 22, so that the projection shape of the bracket 2 in the thickness direction of the bracket 2 is C-shaped.

[0094] As shown, the inner edge of the bracket 2 is denoted as a first edge 23, and the outer edge is denoted as a second edge 24. Figure 4 As shown, the inner edge of the bracket 2 is denoted as a first edge 23, and the outer edge is denoted as a second edge 24. Figure 4 As shown, when the bracket 2 is adjusted to a C-shaped structure as shown, the edge of the bracket 2 at the opening 22 is denoted as a third edge 25. The eddy current moves in the C-shaped area surrounded by the first edge 23, the second edge 24 and the third edge 25, and the first edge 23, the second edge 24 and the third edge 25 are the circumferential line of the bracket 2. In the process of wireless charging of the mobile phone, the bracket 2 will generate eddy current in the area surrounded by the circumferential line, and at this time, the area of the area surrounded by the first edge 23, the second edge 24 and the third edge 25 is the circumferential line area.

[0095] As shown, when the bracket 2 is adjusted to a C-shaped structure as shown, the edge of the bracket 2 at the opening 22 is denoted as a third edge 25. The eddy current moves in the C-shaped area surrounded by the first edge 23, the second edge 24 and the third edge 25, and the first edge 23, the second edge 24 and the third edge 25 are the circumferential line of the bracket 2. In the process of wireless charging of the mobile phone, the bracket 2 will generate eddy current in the area surrounded by the circumferential line, and at this time, the area of the area surrounded by the first edge 23, the second edge 24 and the third edge 25 is the circumferential line area. Figure 6 Figure 6 As shown, when the bracket 2 is adjusted to a C-shaped structure as shown, the edge of the bracket 2 at the opening 22 is denoted as a third edge 25. The eddy current moves in the C-shaped area surrounded by the first edge 23, the second edge 24 and the third edge 25, and the first edge 23, the second edge 24 and the third edge 25 are the circumferential line of the bracket 2. In the process of wireless charging of the mobile phone, the bracket 2 will generate eddy current in the area surrounded by the circumferential line, and at this time, the area of the area surrounded by the first edge 23, the second edge 24 and the third edge 25 is the circumferential line area.

[0096] Formula 2 can be derived from formula 1, and formula 1 is as follows:

[0097]

[0098] In formula 1, B is the strength of the alternating magnetic field in the process of wireless charging of the mobile phone, E is the electric field strength induced by the bracket 2, formula 1 represents that the electric field is the curl source of the magnetic field, the curl source of the magnetic field refers to those physical quantities that can cause the rotation characteristics of the magnetic field, mainly the changing electric field, and the curl source determines the spatial distribution of the magnetic field and the change with time.

[0099] Formula 2 is as follows:

[0100]

[0101] In formula 2, l is the length of the circumferential line, and S is the area surrounded by the circumferential line.

[0102] Formula 3 is as follows:

[0103] P=(E·l) 2 ·R -1

[0104] In formula 3, P is the heating power of the bracket 2, and R is the resistance of the bracket 2. ​

[0105] In this embodiment, according to formula 2, while referring to Figure 4 and Figure 6 , the ring-shaped support in Figure 4 is adjusted to the C-shaped support in Figure 6 , which reduces the perimeter area S of the support 2, thereby reducing the electric field intensity E in the support 2. According to formula 3, the electric field intensity E is reduced, thereby reducing the heating power P of the support 2, i.e., reducing the temperature of the support 2, thereby reducing the risk of damage of the support 2 due to excessive temperature and even damage to the phone; in addition, the reduction of the heating power P of the support 2 reduces the power loss at the support 2 during the wireless charging of the phone, thereby reducing the required power of the wireless charger and reducing the difference between the actual charging power and the theoretical charging power of the phone, thereby reducing the risk of the support 2 being identified as a metal foreign object by the FOD system, to improve the stability of the wireless charging of the phone.

[0106] wherein the opening can be arranged at any position of the support. For example, in a possible design, as shown in Figure 6 , along the radial direction of the support 2, the opening 22 is arranged on both sides of the support 2 opposite to the notch 21.

[0107] Figure 7 is a structural schematic diagram of the support in an embodiment. In another possible design, as shown in Figure 7 , along the radial direction of the support 2, the opening 22 is arranged on one side of the support 2 close to the notch 21, and the opening 22 is in communication with the notch 21, i.e., the opening 22 is hidden at the rotating shaft. This reduces the risk of the opening 22 being exposed on the outside when the support 2 is in the supporting state, causing injury to the user or damage to other objects in the external environment, and also improves the hand feeling of the user when rotating the support 2.

[0108] Figure 8 is a comparison diagram of temperature changes of the ring-shaped support and the C-shaped support during the charging process of the phone. As shown in Figure 8 , in a 50W wireless charging experiment scenario, when the charging time is 60s, the temperature of the ring-shaped support rises to 76.6℃, which will cause damage to the support and the phone, and the high power of the support will be identified by the FOD system, causing the power of the phone to be degraded or even stopped charging. After adjusting the support to the C-shaped support, as shown in Figure 8 , in a 50W wireless charging experiment scenario, when the charging time is 60s, the temperature of the ring-shaped support is only 42.9℃, and the broken design of the support greatly reduces the temperature and power of the support, and the coupling coefficient of the wireless charging of the phone is improved by 35%, from 0.424 to 0.571, which has obvious improvement effect.

[0109] In the second example, the position of the bracket on the housing is adjusted, that is, the relative position of the bracket with respect to the mobile phone and the wireless charger is adjusted to reduce the temperature and power of the bracket.

[0110] Specifically, the mobile phone is provided with a first coil for wireless charging, and the mobile phone's wireless charger is provided with a second coil for wireless charging. During the wireless charging process of the mobile phone, an alternating magnetic field is generated around the first coil and the second coil, and the direction of the magnetic field inside the coil is opposite to the direction of the magnetic field outside the coil. Figure 9 The following is a schematic diagram of the distribution of the magnetic field during the charging process of the machine, as shown in the figure. Figure 9 As shown, at the edge of the coil, that is, at the junction of the internal magnetic field and the external magnetic field, there is a weak magnetic field region 4 because the directions of the internal and external magnetic fields are opposite. The weak magnetic field region 4 includes a first magnetic field region 41 located at the edge of the first coil and a second magnetic field region 42 located at the edge of the second coil.

[0111] Taking the first coil as an example, the positional relationship between the coil and the weak magnetic field area is briefly introduced. For example, Figure 10 This is a schematic diagram of the positional relationship between the first coil and the first magnetic field region 41. The first coil 011 is located in the first magnetic field region 41. The radial distance between the first edge position 411 of the first magnetic field region 41 and the first coil 011 is 3 mm. The radial distance between the second edge position 412 of the first magnetic field region 41 and the first coil 011 is also 3 mm. That is, the first magnetic field region 41 is formed in a 6 mm area near the edge of the first coil 011.

[0112] Figure 11 This is the intended position of the bracket in the magnetic field. Figure 11 As shown, overlapping at least a portion of the bracket 2 with the weak magnetic field region 4 can reduce the magnetic field strength at the position where the bracket 2 is located. According to the above formulas 1 and 3, when the magnetic field strength B decreases, the electromotive force E in the bracket 2 decreases, thereby reducing the heating power P of the bracket 2, that is, reducing the temperature of the bracket 2, thereby reducing the risk of damage to the bracket 2 due to excessive temperature or even damage to the mobile phone; in addition, the heating power P of the bracket 2 is reduced, which reduces the power loss at the bracket 2 during the wireless charging of the mobile phone, thereby reducing the power of the required wireless charger and reducing the difference between the actual charging power of the mobile phone and the theoretical charging power, thereby reducing the risk of the bracket 2 being identified as a metal foreign body by the FOD system, thereby improving the stability of wireless charging of the mobile phone.

[0113] Along the thickness direction of the bracket 2, the projection area of the bracket 2 is S1, the overlapping area of the bracket 2 and the weak magnetic field area 4 is S2, and S2 / S1≥70%. Specifically, the ratio of S2 to S1 can be 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, 100%, etc.

[0114] If S2 / S1<70%, the overlapping area of the bracket 2 and the weak magnetic field area 4 is small, and the effect of reducing the heating power of the bracket 2 is poor. Therefore, S2 / S1≥70%, which can further reduce the temperature of the bracket 2, thereby further reducing the risk of damage to the bracket 2 due to overheating and even damaging the phone, and further reducing the risk of the bracket 2 being identified as a metal foreign object by the FOD system.

[0115] The bracket 2 can coincide with the second coil on the wireless charger, that is, the coincidence degree of the bracket 2 and the second magnetic field area 42 is not less than 70%, and the overlapping area of the bracket 2 and the second magnetic field area 42 is S2. Figure 12 For the setting position of the bracket in the magnetic field, in another possible design, as shown in Figure 12 The bracket 2 coincides with the first coil on the phone, that is, the coincidence degree of the bracket 2 and the first magnetic field area 41 is not less than 70%, and the overlapping area of the bracket 2 and the first magnetic field area 41 is S2. At the same time, it can also make the phone and the protective case compatible with wireless chargers of different brands, so as to improve the range of wireless chargers that can be selected for the phone with the above protective case.

[0116] Figure 13 For the temperature change comparison diagram of the bracket in the first position and the second position, when the bracket is in the first position, the offset distance of the bracket and the first coil is 7mm, and when the bracket is in the second position, the offset distance of the bracket and the first coil is 5mm. As shown in Figure 13 When the bracket is in the first position, the distance between the bracket and the first coil is far, that is, the distance between the bracket and the first magnetic field area is far. In a 50W wireless charging experiment scenario, when the charging time is 60s, the temperature of the bracket rises to 46.6°C. After adjusting the position of the bracket to the second position, the distance between the bracket and the first magnetic field area is reduced. In a 50W wireless charging experiment scenario, when the charging time is 60s, the temperature of the bracket rises to 40.04°C. The offset of the bracket towards the weak magnetic field area greatly reduces the temperature and power of the bracket, which has obvious improvement effect.

[0117] In a third embodiment, a chamfer is provided on the bracket to reduce the cross-sectional area of the bracket. Figure 14 For the cross-sectional profile diagram of the bracket in an embodiment, as shown in Figure 14As shown, the outer surface of the support 2 includes a first surface 26, a second surface 27 and a third surface 28, the first surface 26 and the third surface 28 are oppositely arranged along the radial direction Y of the support, and the second surface 27 is located on the side of the support 2 away from the shell 1 along the thickness direction X2 of the support; the support 2 further includes a chamfer 29, the chamfer 29 at least includes a first chamfer 291, the first surface 26 and the second surface 27 are connected through the first chamfer 291, and / or the chamfer 29 further includes a second chamfer 292, the second surface 27 and the third surface 28 are connected through the second chamfer 292.

[0118] According to formula 4 and formula 5, the relationship between the heat generation power P of the support 2 and the cross-sectional area A of the support 2 can be derived.

[0119] Formula 4 is as follows:

[0120]

[0121] In formula 4, U is the potential difference induced on the support, P is the heat generation power of the support 2, and R is the resistance of the support 2.

[0122] Formula 5 is as follows:

[0123]

[0124] In formula 5, R is the resistance of the support 2, A is the cross-sectional area of the support 2, p is the resistivity of the support 2, and l1 is the length of the support 2.

[0125] In this embodiment, the chamfer 29 is arranged at the edge of the support 2, which can reduce the cross-sectional area A of the support 2. According to formula 4 and formula 5, it can be derived that the cross-sectional area A of the support 2 is reduced, the resistance R of the support 2 is increased, the heat generation power P of the support 2 is reduced, that is, the temperature of the support 2 is reduced, thereby reducing the risk of damage of the support 2 due to excessive temperature and even damage of the mobile phone; in addition, the heat generation power P of the support 2 is reduced, which reduces the power loss at the support 2 during the wireless charging of the mobile phone, thereby reducing the required power of the wireless charger and the difference between the actual charging power and the theoretical charging power of the mobile phone, thereby reducing the risk of the support 2 being identified as a metal foreign object by the FOD system, so as to improve the stability of the wireless charging of the mobile phone.

[0126] Figure 15 The cross-sectional profile of the support in another embodiment is shown. In one possible design, as shown in Figure 15 The inside of the support 2 is provided with a cavity 2a, which can further reduce the cross-sectional area A of the support 2 to reduce the temperature of the support 2 and the risk of the support 2 being identified as a metal foreign object by the FOD system.

[0127] In a fourth embodiment, the temperature of the support is reduced by filling a heat-conducting medium in the support.Figure 16 is a cross-sectional view of the local structure of the bracket, such as Figure 16 As shown, a cavity 2a is provided inside the bracket 2, and the cavity 2a is filled with a heat-conducting medium 5. The heat-conducting medium 5 can increase the temperature transfer speed of the bracket 2, thereby allowing the bracket 2 to cool down quickly, thereby reducing the risk of the bracket 2 being damaged by overheating or even damaging the mobile phone.

[0128] Figure 17 Figure 2 is a schematic diagram of the temperature distribution of the bracket. Since the bracket 2 is in an uneven magnetic field, the temperature of each part of the bracket 2 is different. For example, Figure 17 As shown, there are a first heating area 2b and a second heating area 2c on the bracket 2, and the temperature of the bracket 2 at the first heating area 2b is higher than the temperature at the second heating area 2c.

[0129] In one possible design, the same heat-conducting medium is filled in the cavity at the first heating zone 2b and the cavity at the second heating zone 2c. For example, the cavity at the first heating zone 2b and the cavity at the second heating zone 2c are both filled with graphene to improve the overall heat dissipation effect of the bracket 2.

[0130] In another possible design, different heat-conducting media are filled in the cavity at the first heating zone 2b and the cavity at the second heating zone 2c. For example, the cavity at the first heating zone 2b is filled with graphene, and the cavity at the second heating zone 2c is filled with thermal conductive glue. Graphene can improve the heat dissipation effect at the first heating zone 2b, thereby reducing the maximum temperature of the bracket 2, and the thermal conductive glue can facilitate the installation of other parts in the bracket 2, thereby helping to improve the integration of the bracket 2.

[0131] In the fifth embodiment, the resistance of the bracket is increased by adjusting the material of the bracket.

[0132] Taking the bracket as an example, the bracket material can be adjusted to a metal material with a high resistivity, such as 6013 aluminum alloy or 7075 aluminum alloy. The resistivity ρ of 6013 aluminum alloy and 7075 aluminum alloy is relatively large. According to the above formulas 4 and 5, the larger the resistivity ρ, the greater the resistance R of the bracket, and the smaller the heating power of the bracket. By increasing the resistivity of the bracket, the heating power P of the bracket 2 can be reduced, that is, the temperature of the bracket 2 is reduced, thereby reducing the risk of damage to the bracket 2 due to excessive temperature or even damage to the mobile phone; in addition, the reduction in the heating power P of the bracket 2 reduces the power loss at the bracket 2 during the wireless charging process of the mobile phone, thereby reducing the power of the wireless charger required, and reducing the difference between the actual charging power of the mobile phone and the theoretical charging power, thereby reducing the risk of the bracket 2 being identified as a metal foreign body by the FOD system, thereby improving the stability of the mobile phone wireless charging.

[0133] Figure 18is a schematic diagram of the cross-sectional structure of the bracket. Figure 18 As shown, the outer surface of the bracket 2 is subjected to a thickening oxidation process, such as an anodizing method, to form an oxidized insulating layer 2d of a certain thickness on the metal surface of the bracket 2. The thickness of the oxidized insulating layer 2d is greater than or equal to 50 μm. For example, the thickness of the oxidized insulating layer 2d can be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, etc.

[0134] In this embodiment, without changing the overall size of bracket 2, the thickness of the oxide insulating layer 2d on the surface of bracket 2 is increased, thereby reducing the flow area of ​​eddy currents within bracket 2. According to Formulas 4 and 5, the reduced flow area of ​​eddy currents increases the overall resistance of bracket 2, thereby reducing the heating power of bracket 2. By increasing the thickness of the oxide insulating layer 2d on the surface of bracket 2, the heating power P of bracket 2 can be reduced, that is, the temperature of bracket 2 is reduced, thereby reducing the risk of damage to bracket 2 due to excessive temperature, or even damage to the mobile phone. In addition, the reduced heating power P of bracket 2 reduces the power loss at bracket 2 during the wireless charging of the mobile phone, thereby reducing the power required by the wireless charger and reducing the difference between the actual charging power of the mobile phone and the theoretical charging power. This reduces the risk of bracket 2 being identified as a metal foreign object by the FOD system, thereby improving the stability of wireless charging of the mobile phone. At the same time, an oxide insulating layer 2d is provided on the surface of the bracket 2. During the wireless charging process of the mobile phone, no eddy current is generated in the oxide insulating layer 2d. The temperature of the oxide insulating layer 2d mainly comes from the diffusion of the metal inside the bracket 2 to the outside, thereby reducing the surface temperature of the bracket 2 and reducing the risk of damage to the bracket 2 and the mobile phone due to high temperature.

[0135] In the sixth embodiment, the risk of the FOD system identifying the bracket as a metal foreign body is reduced by detecting and judging whether the mobile phone is in a case and adjusting the FOD threshold according to the judgment result.

[0136] Figure 19 It is a schematic diagram of the structure of the protective shell. Figure 19 As shown, an identification module 6 is provided on the shell 1, and the identification module 6 is used to transmit a signal to the identification module on the mobile phone. The identification module determines that the mobile phone is in a shell state according to the received signal, and adjusts the FOD threshold on the mobile phone from the first threshold to the second threshold. The first threshold is smaller than the second threshold, thereby reducing the risk of the metal bracket 2 being identified as a metal foreign body by the FOD system, and improving the stability of wireless charging of the mobile phone.

[0137] The identification module 6 can be a magnet. In this case, the mobile phone is provided with a Hall sensor. When the magnet approaches the Hall sensor, the magnet changes the surrounding magnetic field distribution. The Hall sensor can sense these changes and output corresponding signals, thereby determining that the mobile phone is in a cased state.

[0138] The identification module 6 can also be an NFC chip. The mobile phone can identify the NFC chip on the shell 1 through its own NFC function, so as to determine that the mobile phone is in the shell state.

[0139] In the embodiment, the identification module 6 is a magnet or an NFC chip, which reduces the difficulty of identification of the mobile phone to the protective shell, thereby facilitating the simplification of the structure of the protective shell, and reducing the cost and size of the protective shell.

[0140] The identification module 6 can be fixed on the surface of the shell 1 or embedded in the interior of the shell 1. The specific number, setting position, and fixing mode of the identification module 6 are not specially limited in the embodiment.

[0141] In summary, based on the above six embodiments, one of the above can be used alone on the protective shell, or at least two of the above can be combined. The same and similar parts among the embodiments in the specification can be referred to each other.

Claims

1. A protective case for protecting an electronic device with a wireless charging function, characterized in that: The protective shell includes: case; a bracket, the bracket being mounted on the housing and made of metal; The bracket is provided with an opening so that the projection shape of the bracket along its thickness direction is C-shaped; The outer surface of the bracket is covered with an oxidized insulating layer, and the thickness of the oxidized insulating layer is greater than or equal to 50 μm.

2. The protective case according to claim 1, wherein: The protective shell further includes a rotating shaft, and the bracket is connected to the shell via the rotating shaft; The bracket is provided with a notch, and at least a portion of the rotating shaft is located in the notch; Along the radial direction of the bracket, the opening is arranged on a side of the bracket close to the notch, and the opening is communicated with the notch.

3. The protective case according to claim 1, wherein: The electronic device has a first coil, and the wireless charger of the electronic device has a second coil. During the wireless charging process of the electronic device, a weak magnetic field region exists at the edges of the first coil and the second coil. When the bracket is in the stored state, along the thickness direction of the bracket, the projection area of ​​the bracket is S1, the overlapping area of ​​the bracket and the weak magnetic field region is S2, and S2 / S1≥70%.

4. The protective case according to claim 3, characterized in that: The weak magnetic field region includes a first magnetic field region and a second magnetic field region. During the wireless charging process of the electronic device, the first magnetic field region is located at the edge of the first coil, and the second magnetic field region is located at the edge of the second coil. When the bracket is in the stored state, an overlapping area between the bracket and the first magnetic field region along the thickness direction of the bracket is S2.

5. The protective case according to claim 1, wherein: The outer surface of the bracket includes a first surface, a second surface and a third surface, the first surface and the third surface are arranged opposite to each other along the radial direction of the bracket, and along the thickness direction of the bracket, the second surface is located on the side of the bracket away from the housing; The bracket further includes a first chamfer, and the first surface and the second surface are connected via the first chamfer; and / or the bracket further includes a second chamfer, and the second surface and the third surface are connected via the second chamfer.

6. The protective case according to claim 1, wherein: A cavity is provided inside the bracket, and the cavity is filled with a heat-conducting medium.

7. The protective case according to claim 6, characterized in that: The bracket includes a first temperature zone and a second temperature zone, and during wireless charging of the electronic device, the temperature of the first temperature zone is higher than the temperature of the second temperature zone; The heat-conducting medium is graphene, and the cavity in the first temperature region and the cavity in the second temperature region are both filled with graphene; Alternatively, the heat-conducting medium includes graphene and heat-conducting glue, and the cavity in the second temperature zone is filled with graphene or heat-conducting glue.

8. The protective case according to claim 1, wherein: The material of the bracket is 6013 aluminum alloy or 7075 aluminum alloy.

9. The protective case according to any one of claims 1 to 8, characterized in that: The housing is provided with an identification module, and the identification module is used to transmit a signal to the identification module on the electronic device to adjust the metal foreign body identification threshold on the electronic device from a first threshold to a second threshold.

10. The protective case according to claim 9, characterized in that: The identification module is a magnet or an NFC chip.

11. A protective case for protecting an electronic device with a wireless charging function, wherein the electronic device has a first coil and the wireless charger of the electronic device has a second coil. During the wireless charging process of the electronic device, a weak magnetic field region exists at the edges of the first coil and the second coil; characterized in that: The protective shell includes: case; a bracket, the bracket being mounted on the housing and made of metal; When the bracket is in the stored state, along the thickness direction of the bracket, the projection area of ​​the bracket is S1, the overlapping area of ​​the bracket and the weak magnetic field region is S2, and S2 / S1≥70%.

12. The protective case according to claim 11, wherein: The weak magnetic field region includes a first magnetic field region and a second magnetic field region. During the wireless charging process of the electronic device, the first magnetic field region is located at the edge of the first coil, and the second magnetic field region is located at the edge of the second coil. When the bracket is in the stored state, an overlapping area between the bracket and the first magnetic field region along the thickness direction of the bracket is S2.

13. The protective case according to claim 11, wherein: The bracket is provided with an opening so that the projection shape of the bracket along its thickness direction is C-shaped.

14. The protective case according to claim 13, wherein: The protective shell further includes a rotating shaft, and the bracket is connected to the shell via the rotating shaft; The bracket is provided with a notch, and at least a portion of the rotating shaft is located in the notch; Along the radial direction of the bracket, the opening is arranged on a side of the bracket close to the notch, and the opening is communicated with the notch.

15. The protective case according to claim 11, wherein: The outer surface of the bracket includes a first surface, a second surface and a third surface, the first surface and the third surface are arranged opposite to each other along the radial direction of the bracket, and along the thickness direction of the bracket, the second surface is located on the side of the bracket away from the housing; The bracket further includes a first chamfer, and the first surface and the second surface are connected via the first chamfer; and / or the bracket further includes a second chamfer, and the second surface and the third surface are connected via the second chamfer.

16. The protective case according to claim 11, wherein: A cavity is provided inside the bracket, and the cavity is filled with a heat-conducting medium.

17. The protective case according to claim 16, wherein: The bracket includes a first temperature zone and a second temperature zone, and during wireless charging of the electronic device, the temperature of the first temperature zone is higher than the temperature of the second temperature zone; The heat-conducting medium is graphene, and the cavity in the first temperature region and the cavity in the second temperature region are both filled with graphene; Alternatively, the heat-conducting medium includes graphene and heat-conducting glue, and the cavity in the second temperature zone is filled with graphene or heat-conducting glue.

18. The protective case according to claim 11, wherein: The material of the bracket is 6013 aluminum alloy or 7075 aluminum alloy.

19. The protective case according to claim 11, wherein: The outer surface of the bracket is covered with an oxidized insulating layer, and the thickness of the oxidized insulating layer is greater than or equal to 50 μm.

20. The protective case according to any one of claims 11 to 19, characterized in that: The housing is provided with an identification module, and the identification module is used to transmit a signal to the identification module on the electronic device to adjust the metal foreign body identification threshold on the electronic device from a first threshold to a second threshold.

21. The protective case according to claim 20, wherein: The identification module is a magnet or an NFC chip.

Images