Handheld electronic equipment with anti-electromagnetic interference function

Abstract

The utility model provides a handheld electronic device with an anti-electromagnetic interference function. The handheld electronic equipment comprises a columnar grip, a motor and a motor connecting wire, an internal space capable of containing the motor and the motor connecting wire is formed in the columnar grip in a surrounding mode, and at least one part of the motor and at least one part of the motor connecting wire are assembled in the internal space of the columnar grip. The columnar grip is provided with at least one layer of composite shell, the composite shell comprises an insulating material layer and an electromagnetic shielding material layer, and the electromagnetic shielding material layer at least surrounds part of the motor and part of the motor connecting wire and is grounded. The electromagnetic interference inside the handheld electronic equipment can be shielded, and the electromagnetic compatibility problem is greatly optimized. Meanwhile, electromagnetic radiation of the grip part can be shielded, and harm to the body health of a user is reduced.

Description

Technical Field

[0001] The utility model relates to the field of electronic devices, in particular to a handheld electronic device with an electromagnetic interference resistance function. Background Art

[0002] Handheld electronic devices such as hair dryers and handheld electric fans are widely used in daily life. Many handheld electronic devices rely on motors to work. Whether it is an AC motor or a DC motor, electromagnetic interference signals will be generated when the motor is running. These interference signals are transmitted along the wires or directly emitted into space. The electromagnetic interference generated when the handheld electronic device works will not only affect the use of other electrical appliances, but also affect the physical health of the user through electromagnetic radiation of the handheld part. Its electromagnetic compatibility problem cannot be underestimated.

[0003] The traditional means to improve electromagnetic interference is to increase the common mode at the input voltage end, or add devices such as filters on the circuit board. This method can only improve the interference of the physical circuit. When the power loop of the switching signal is larger and the interference intensity to space is greater, it is difficult to rely on the components on the circuit board to suppress. Moreover, adding circuit components will also increase the cost and space of the device. Summary of the Utility Model

[0004] One of the purposes of the utility model is to improve the electromagnetic compatibility problem of the handheld electronic device and the electromagnetic radiation problem of the handheld part.

[0005] To achieve the above purpose, on the one hand, the utility model provides a handheld electronic device. The handheld electronic device includes a columnar grip, a motor and a motor connecting wire. An internal space for accommodating the motor and the motor connecting wire is formed around the inside of the columnar grip. At least a part of the motor and the motor connecting wire is assembled in the internal space of the columnar grip. The columnar grip has at least one layer of composite shell. The composite shell includes an insulating material layer and an electromagnetic shielding material layer. The electromagnetic shielding material layer is disposed at least around part of the motor and part of the motor connecting wire and is grounded.

[0006] Optionally, the composite shell of the columnar grip is set as the inner shell of the columnar grip. At least a part of the motor and the motor connecting wire is disposed inside the inner shell of the columnar grip. The electromagnetic shielding material layer is located inside the composite shell. The columnar grip further includes a columnar grip outer shell.

[0007] Optionally, the columnar grip outer shell is a single-shell structure formed of insulating material.

[0008] Optionally, the electromagnetic shielding material layer further includes a card slot, the motor connection line includes an external ground wire, at least part of the wire core of the external ground wire is exposed, and the exposed part is placed on the card slot to form electrical contact with the electromagnetic shielding material layer.

[0009] Optionally, the columnar grip inner shell is composed of two semi-cylindrical sheet structures, the card slot is located on the first sheet structure, and a pressing member is included on the second sheet structure. The pressing member is used to fasten the first sheet structure and the second sheet structure, and make the external ground wire in close contact with the card slot.

[0010] Optionally, the handheld electronic device is a hair dryer, the handheld electronic device further has a circuit module, and the external ground wire is connected to the negative terminal or the ground terminal of the circuit module.

[0011] Optionally, the composite shell of the columnar grip is set as the columnar grip outer shell, the electromagnetic shielding material layer is located inside the composite shell, the columnar grip further includes a columnar grip inner shell, and at least a part of the motor and the motor connection line are arranged inside the columnar grip inner shell.

[0012] Optionally, there is a space between the columnar grip outer shell and the columnar grip inner shell, the handheld electronic device further has a circuit module, and at least a part of the circuit module is arranged in the space between the columnar grip outer shell and the columnar grip inner shell.

[0013] Optionally, the electromagnetic shielding material layer is a copper foil, and the copper foil is attached to the inner side of the insulating material layer by means of pasting.

[0014] Optionally, the electromagnetic shielding material layer forms an electrical connection with the motor connection line through a conductive adhesive tape.

[0015] Optionally, the electromagnetic shielding material layer forms an electrical connection with the motor connection line through a conductive adhesive, and the conductive adhesive also helps to fix the motor connection line.

[0016] Optionally, the composite shell is a plastic-coated aluminum shell, the insulating material layer is a high thermal conductivity plastic on the outside of the plastic-coated aluminum shell, and the electromagnetic shielding material layer is the inner aluminum shell of the plastic-coated aluminum shell.

[0017] The handheld electronic device provided by the present application includes a columnar grip. An internal space for accommodating a motor and motor connection wires is formed around the inside of the columnar grip. At least a part of the motor and the motor connection wires are assembled inside the internal space of the columnar grip, and the columnar grip has at least one composite housing. In the present application, the composite housing includes an insulating material layer and an electromagnetic shielding material layer. By arranging the electromagnetic shielding material layer to at least surround part of the motor and part of the motor connection wires and grounding it, the electromagnetic interference inside the handheld electronic device can be shielded, greatly optimizing the electromagnetic compatibility problem. At the same time, the electromagnetic radiation of the grip part can be shielded, reducing the harm to the health of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 6 is an exploded view of the structure of the handheld part of the handheld electronic device provided by an embodiment of the present invention;

[0019] Figure 2 FIG. 7 is a schematic diagram of the structure of the handheld part of the handheld electronic device provided by an embodiment of the present invention;

[0020] FIG. 3(a) is a schematic diagram of the internal structure of the handheld part of the handheld electronic device provided by an embodiment of the present invention;

[0021] FIG. 3(b) is a schematic diagram of the internal structure of the handheld part of the handheld electronic device in another direction provided by an embodiment of the present invention;

[0022] Figure 4 FIG. 8 is an exploded view of the structure of the handheld part of the handheld electronic device provided by another embodiment of the present invention;

[0023] Figure 5 FIG. 1 is a schematic diagram of the structure of the handheld electronic device provided by an embodiment of the present invention.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS: 10-columnar grip; 11-inner shell of the columnar grip; 12-outer shell of the columnar grip; 111-insulating material layer; 112-electromagnetic shielding material layer; 1111-latch; 1122-compressing member; 113-first sheet-like structure; 1131-through hole; 114-second sheet-like structure; 1141-fitting part for the fixing member; 13-motor; 14-motor connection wire; 141-external ground wire; 1411-wire core; 15-switch circuit module; 20-air duct part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to improve the electromagnetic compatibility problem of the handheld electronic device and the electromagnetic radiation problem of the handheld part, the present application provides a handheld electronic device with an anti-electromagnetic interference function.

[0026] The following further describes in detail the handheld electronic device proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. As used in this application, the singular forms "a", "an", and "the" include plural objects. The term "or" is generally used in the sense of including "and / or". The term "several" is generally used in the sense of including "at least one". The terms "at least two" and "a plurality" are generally used in the sense of including "two or more". In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or at least two of such features, unless the content clearly states otherwise. Spatially relative terms, such as "under", "below", "lower", "above", "upper", etc., are used to simply describe the relationship between one element of the present disclosure and another element. Spatially relative terms are used to cover different orientations of a device including the element. Spatially relative terms are used to include different orientations of the handheld electronic device structure during use or operation, as well as the orientations described in the drawings. When the handheld electronic device is turned to different orientations (rotated 90 degrees or other orientations), the spatially relative adjectives used therein will also be interpreted according to the orientation after turning.

[0027] Figure 1 An exploded view of the handheld part structure of the handheld electronic device provided by an embodiment of the present utility model. Figure 2 A schematic diagram of the handheld part structure of the handheld electronic device provided by an embodiment of the present utility model. Refer to Figure 1 , Figure 2 As shown, the handheld electronic device includes a columnar grip 10, a motor 13, and a motor connection line 14. An internal space for accommodating the motor 13 and the motor connection line 14 is formed around the inside of the columnar grip 10. At least a part of the motor 13 and the motor connection line 14 is assembled in the internal space of the columnar grip 10. The columnar grip 10 has at least one layer of composite shell, and the composite shell includes an insulating material layer 111 and an electromagnetic shielding material layer 112. The electromagnetic shielding material layer 112 is disposed at least around part of the motor 13 and part of the motor connection line 14 and is grounded.

[0028] In this embodiment, Figure 1The handheld part of the handheld electronic device is shown. The handheld part is a columnar grip 10, and the columnar grip 10 can be a regular or irregular columnar body, which is convenient for the user to hold. A hollow internal space is formed around the inside of the columnar grip 10. The motor 13 and the motor connection line 14 of the handheld electronic device are arranged in this internal space. The motor connection line 14 extends in this internal space after being led out from the motor 13. The motor connection line 14 can connect the motor 13 with the circuit module of the handheld electronic device and transmit electrical signals. The circuit module can be arranged outside the handheld part, or inside the handheld part, or partially arranged inside the handheld part. According to the different positions of the circuit module, the motor connection line 14 can extend out from the opening of the columnar grip 10 to connect with the circuit module outside the handheld part, or can be completely placed in the internal space of the columnar grip 10.

[0029] The columnar grip 10 at least includes a layer of composite shell, such as Figure 1 shown, the composite shell is composed of an insulating material layer 111 and an electromagnetic shielding material layer 112. The electromagnetic shielding material layer 112 is located inside the insulating material layer 111, surrounds or covers at least a part of the motor 13 and at least a part of the motor connection line 14, and the electromagnetic shielding material layer 112 is grounded, thereby forming a shielding layer, effectively blocking the electromagnetic interference signals in the internal space, greatly reducing the radiation of the electromagnetic interference signals to the outside of the columnar grip 10, and further reducing the harm to the physical health of the user.

[0030] In one embodiment, the electromagnetic shielding material layer 112 can completely surround or cover the motor 13 and the motor connection line 14 placed inside the columnar grip 10 to form a more enclosed shielding space and achieve a better shielding effect. In another embodiment, the electromagnetic shielding material layer 112 can also only wrap part of the motor 13 and part of the motor connection line 14, such as part of the structure at the connection position of the motor 13 and the motor connection line 14, to shield the space with stronger electromagnetic interference signals to balance the shielding effect and material cost.

[0031] In one embodiment, as Figure 1 shown, the composite shell of the columnar grip 10 is set as the inner columnar grip 11, at least a part of the motor 13 and the motor connection line 14 are arranged inside the inner columnar grip 11, the electromagnetic shielding material layer 112 is located inside the composite shell, and the columnar grip 10 further includes an outer columnar grip 12. The shape of the electromagnetic shielding material layer 112 is adapted to the shape of the insulating material layer 111 to fit better. The inner columnar grip 11 can be completely accommodated inside the outer columnar grip 12, and the outer columnar grip 12 can be made of insulating material to further enhance the holding safety. In one embodiment, the outer columnar grip 12 can be a single-shell structure formed of insulating material. In other embodiments, the outer columnar grip 12 can also be a multi-layer composite shell structure.

[0032] In one embodiment, the electromagnetic shielding material layer 112 is a copper foil, which is attached to the inner side of the insulating material layer by pasting. The electromagnetic shielding material layer 112 can also be made of other shielding materials such as aluminum foil and alloy materials. In another embodiment, the composite housing is a plastic-coated aluminum housing, the insulating material layer 111 is a high thermal conductivity plastic on the outer side of the plastic-coated aluminum housing, and the electromagnetic shielding material layer 112 is the inner aluminum shell of the plastic-coated aluminum housing. The plastic-coated aluminum housing can be integrally formed. In other embodiments, the composite housing can also be a single-layer housing. For example, the insulating material layer 111 is set as a plastic housing, and copper, aluminum, etc. are sprayed on the inner side of the insulating material layer 111 to form the electromagnetic shielding material layer 112. Or, metal fibers can be incorporated during the steam molding of the insulating material layer 111 as the electromagnetic shielding material layer 112 to achieve the electromagnetic shielding effect. The electromagnetic shielding material layer 112 can be a metal sheet layer or a metal mesh structure, etc.

[0033] FIG. 3(a) and FIG. 3(b) are schematic diagrams of the internal structure of the handheld part of the handheld electronic device provided by an embodiment of the present invention. Please refer to FIG. 3(a) and FIG. 3(b) simultaneously. In one embodiment, the electromagnetic shielding material layer 112 further includes a card slot, the motor connection wire 14 includes an external ground wire 141, at least part of the wire core 1411 of the external ground wire 141 is exposed, and the exposed part is placed on the card slot to form electrical contact with the electromagnetic shielding material layer 112. Thus, the external ground wire 141 of the motor 13 can be reused for electromagnetic shielding, simplifying the internal structure. In other embodiments, the card slot 1121 can be made of other conductive materials different from the shielding material layer 112. For example, the card slot 1121 can be made of a metal material with good stiffness and not easy to deform, which can better fix the wire core 1141 while forming electrical contact with the shielding material layer 112.

[0034] In this embodiment, a buckle 1111 is provided on the electromagnetic shielding material layer 112. The buckle 1111 forms an angle with the inner wall of the columnar grip inner shell 11 to form a card slot with a certain accommodation space between the electromagnetic shielding material layer 112. The exposed wire core 1411 passes through the card slot and is clamped by the buckle 1111. The number of the card slot and the buckle 1111 can be one or more. The number of the card slot and the buckle 1111 in the figure is two only for illustration. In other embodiments, the card slot can also be set in other ways, such as any supporting structure extending from the inner wall with an accommodation space, etc.

[0035] In this embodiment, the buckle 1111 is formed by stamping and bending inward from the side of the electromagnetic shielding material layer 112. The width of the buckle 1111 can be set according to the properties such as the metal strength of the shielding material. When the electromagnetic shielding material layer 112 and the insulating material layer 111 are an integrally formed structure such as a plastic-coated aluminum housing, the buckle 1111 can also be integrally stamped and bent from the integrally formed housing. In another embodiment, the buckle 1111 is formed by injection molding on the insulating material layer 111, and holes or slots are provided on the electromagnetic shielding material layer 112 to allow the buckle 1111 to pass through. In other embodiments, buckles 1111 can be provided on both the electromagnetic shielding material layer 112 and the insulating material layer 111, and the two are closely attached to jointly clamp the wire core 1141. For example, the buckle 1111 on the electromagnetic shielding material layer 112 is formed by stamping and bending, and the buckle 1111 on the insulating material layer 111 is formed by injection molding. It should be noted that the formation method of the buckle 1111 is not limited to the above embodiments.

[0036] In one embodiment, referring to Figure 1 FIG. 3(a) and FIG. 3(b), the columnar grip inner shell 11 is composed of two semi-cylindrical sheet structures. The card slot is located on the first sheet structure 113, and a pressing member 1122 is included on the second sheet structure 114. The pressing member 1122 is used to fasten the first sheet structure and the second sheet structure 114, and to make the outer ground wire 141 in close contact with the card slot.

[0037] In this embodiment, the position and shape of the pressing member 1122 need to be matched with the position and shape of the card slot. When the first sheet structure 113 and the second sheet structure 114 are butted, the pressing member 1122 can be inserted into the card slot, so that the first sheet structure 113 and the second sheet structure 114 are fastened, and the outer ground wire 141 is in close contact with the electromagnetic shielding material layer 112 at the card slot position. In this embodiment, as shown in FIG. 3(b), the pressing member 1122 is formed by injection molding on the insulating material layer 111 and passes through the electromagnetic shielding material layer 112. In other embodiments, the pressing member 1122 can also be formed by the electromagnetic shielding material layer 112, such as being formed by stamping and bending from the side of the electromagnetic shielding material layer 112, and the bending angle is matched with the angle between the buckle 1111 and the inner wall. The pressing member 1122 can also be jointly formed by the electromagnetic shielding material layer 112 and the insulating material layer 111. The specific implementation method can refer to the implementation method of the buckle 1111 in the above embodiments and will not be elaborated here.

[0038] As shown in FIGS. 3(a) and 3(b), through holes 1131 are further provided on the first sheet-like structure 113, and a fixing member mating portion 1141 is provided on the second sheet-like structure 114. The first sheet-like structure 113 and the second sheet-like structure 114 can be fixedly connected by a fixing member and the fixing member mating portion 1141, thereby forming a complete columnar grip inner shell 11. For example, the fixing member can be a screw, and the fixing member mating portion can be a screw hole. In other embodiments, other methods can also be used to fixedly connect the first sheet-like structure 113 and the second sheet-like structure 114.

[0039] In one embodiment, the electromagnetic shielding material layer 112 is electrically connected to the motor connection line 14 through a conductive adhesive, and the conductive adhesive can also help fix the motor connection line 14 at the same time. Compared with the method in the above embodiment where the motor connection line 14 is electrically connected and fixed to the electromagnetic shielding material layer 112 through a card slot and a buckle, bonding with the conductive adhesive makes the structure simpler and the cost lower. In addition, the columnar grip inner shell 11 can also be an integrally formed complete columnar structure, or a multi-segment columnar structure that can be opened and closed up and down, which is not limited herein.

[0040] In one embodiment, as Figure 5 shown, the handheld electronic device is a hair dryer. The handheld electronic device further has a circuit module. The handheld electronic device is composed of a handheld part and a hair dryer part 20. The circuit module can be disposed in the hair dryer part 20, or can be disposed in the handheld part, or can be partially disposed in the hair dryer part 20 and partially disposed in the handheld part. The external ground wire is connected to the negative terminal or the ground terminal of the circuit module, so that there is no need to separately lead out the external ground wire for grounding. Figure 5 The hair dryer in

[0041] is only an example of the handheld electronic device. The handheld electronic device can also be a shaver, a portable fan, etc.

[0042] In one embodiment, the composite shell of the columnar grip 10 is provided as the columnar grip outer shell. The electromagnetic shielding material layer is located inside the composite shell. The columnar grip 10 further includes a columnar grip inner shell, and at least a part of the motor 13 and the motor connection line 14 are disposed inside the columnar grip inner shell. The inner side of the columnar grip outer shell is an electromagnetic shielding material layer, and the outer side is an insulating material layer. The columnar grip inner shell is sleeved inside the columnar grip outer shell, and the electromagnetic shielding material layer of the columnar grip outer shell can at least surround part of the motor 13 and part of the motor connection line 14.

[0042] In one embodiment, there is a space between the columnar grip outer shell and the columnar grip inner shell. The handheld electronic device further has a circuit module, and at least a part of the circuit module is disposed in the space between the columnar grip outer shell and the columnar grip inner shell. For example, please refer to Figure 4 Figure 4An exploded view of the handheld part structure of a handheld electronic device provided by another embodiment of the present utility model. The circuit module can be a switch circuit module 15, and the switch circuit module is disposed in the internal space of the columnar grip housing ( Figure 4 not shown) and the columnar grip inner housing.

[0043] In one embodiment, when the columnar grip housing is set as a composite housing, when grounding the electromagnetic shielding material layer, the external ground wire in the motor connection wire can still be reused for grounding. Specifically, two through holes can be opened at positions corresponding to the electromagnetic shielding material layer on the columnar grip inner housing 11. The external ground wire of the motor passes through the columnar grip inner housing 11 from one through hole and then passes back into the columnar grip inner housing 11 from the other through hole. A part of the wire core of the external ground wire outside the columnar grip inner housing 11 is exposed, and the exposed wire core can be electrically connected to the electromagnetic shielding material layer of the columnar grip housing by means of clamping, pasting, etc., so that the electromagnetic shielding material layer is grounded. In another embodiment, the electromagnetic shielding material layer can be grounded by reusing the ground wire of the circuit module disposed between the columnar grip housing 12 and the columnar grip inner housing 11. For example, the ground wire of the switch circuit module in Figure 4 can be reused for grounding. Since part of the circuit module is disposed outside the columnar grip inner housing 11, there is no need to open holes in the columnar grip inner housing 11, and the ground wire can be directly led out from the circuit module and electrically connected to the electromagnetic shielding material layer of the columnar grip housing 12, and the connection method is simpler. In other embodiments, the electromagnetic shielding material layer can also be grounded in other ways.

[0044] In one embodiment, both the columnar grip inner housing and the columnar grip housing of the columnar grip can be set as composite housings with electromagnetic shielding material layers to achieve a better shielding effect.

[0045] This specification is described in a progressive manner. The embodiments in which the composite housing of the columnar grip described later is set as the columnar grip housing illustrate the differences from the embodiments in which the composite housing of the columnar grip described earlier is set as the columnar grip inner housing. For the same and similar parts between each part, reference can be made to each other.

[0046] The above description is only a description of the preferred embodiments of the present utility model, and does not limit any scope of the rights of the present utility model. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present utility model by using the methods and technical contents disclosed above without departing from the spirit and scope of the present utility model. Therefore, any simple modifications, equivalent changes and decorations made to the above embodiments according to the technical essence of the present utility model without departing from the technical solutions of the present utility model all belong to the protection scope of the technical solutions of the present utility model.

Claims

1. A handheld electronic device with anti-electromagnetic interference function, characterized in that, The handheld electronic device includes a columnar grip, a motor, and a motor connection line. An internal space for accommodating the motor and the motor connection line is formed around the inside of the columnar grip. At least a part of the motor and the motor connection line is assembled in the internal space of the columnar grip. The columnar grip has at least one composite housing, and the composite housing includes an insulating material layer and an electromagnetic shielding material layer. The electromagnetic shielding material layer is disposed at least around part of the motor and part of the motor connection line and is grounded.

2. The handheld electronic device according to claim 1, wherein The composite housing of the columnar grip is provided as the inner housing of the columnar grip. At least a part of the motor and the motor connection line is disposed inside the inner housing of the columnar grip. The electromagnetic shielding material layer is located inside the composite housing. The columnar grip further includes a columnar grip outer housing.

3. The handheld electronic device according to claim 2, wherein The columnar grip outer housing is a single-shell structure formed of an insulating material.

4. The handheld electronic device according to claim 2, wherein, The electromagnetic shielding material layer further includes a card slot. The motor connection line includes an external ground wire, and at least part of the core of the external ground wire is exposed. The exposed part is placed on the card slot to form an electrical contact with the electromagnetic shielding material layer.

5. The handheld electronic device according to claim 4, wherein, The inner housing of the columnar grip is composed of two semi-cylindrical sheet structures. The card slot is located on the first sheet structure, and a pressing member is included on the second sheet structure. The pressing member is used to fasten the first sheet structure and the second sheet structure and to make the external ground wire in close contact with the card slot.

6. The handheld electronic device according to claim 4, wherein The handheld electronic device is a hair dryer, and the handheld electronic device further has a circuit module. The external ground wire is connected to the negative terminal or the ground terminal of the circuit module.

7. The handheld electronic device according to claim 1, wherein, The composite housing of the columnar grip is provided as the columnar grip outer housing. The electromagnetic shielding material layer is located inside the composite housing. The columnar grip further includes an inner housing of the columnar grip, and at least a part of the motor and the motor connection line is disposed inside the inner housing of the columnar grip.

8. The handheld electronic device according to claim 7, wherein There is a space between the columnar grip outer housing and the inner housing of the columnar grip. The handheld electronic device further has a circuit module, and at least a part of the circuit module is disposed in the space between the columnar grip outer housing and the inner housing of the columnar grip.

9. The handheld electronic device according to claim 1, wherein, The electromagnetic shielding material layer is a copper foil, and the copper foil is attached to the inside of the insulating material layer by means of pasting.

10. The handheld electronic device according to claim 1, characterized in that, The electromagnetic shielding material layer forms an electrical connection with the motor connection line through a conductive adhesive tape.

11. The handheld electronic device according to claim 1, wherein The electromagnetic shielding material layer forms an electrical connection with the motor connection line through a conductive adhesive, and the conductive adhesive also helps to fix the motor connection line.

12. The handheld electronic device according to claim 1, wherein The composite housing is a plastic-coated aluminum housing. The insulating material layer is a high thermal conductivity plastic on the outside of the plastic-coated aluminum housing, and the electromagnetic shielding material layer is the aluminum shell on the inside of the plastic-coated aluminum housing.

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