electronic devices

Abstract

This utility model discloses an electronic device, relating to the field of electronic circuit technology. The electronic device includes a housing, a circuit board, a surge grounding terminal, and conductive fasteners. The housing has a receiving cavity and a mounting hole communicating with the receiving cavity. The circuit board is disposed in the receiving cavity and has a surge protection circuit and a surge grounding terminal. The surge grounding terminal is electrically connected to the surge protection circuit and is spaced apart from the housing. The conductive fasteners can pass through the mounting hole and be detachably connected to the surge grounding terminal, allowing the surge protection circuit to be electrically connected to or disconnected from the housing. The technical solution provided by this utility model ensures that the electronic device can meet the insulation withstand voltage test requirements without tightening the grounding screw. After tightening the grounding screw, both differential mode and common mode surges can meet the requirements. No additional electronic components are added to the circuit design, resulting in minimal and negligible increase in overall cost, and the effect is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to an electronic device. Background Technology

[0002] Surge protection design is required at the power supply front end of general electronic devices to protect them from induced voltage surges caused by lightning strikes, thus protecting the protected electronic devices or systems from such impacts.

[0003] Before electronic devices are released to the market, insulation withstand voltage testing and surge testing are required. However, due to varying surge test conditions, surge circuit malfunctions during insulation withstand voltage testing, leading to test failures. To avoid this, the surge protection circuit can be disconnected and then reconnected before the insulation withstand voltage test; alternatively, the surge protection circuit components can be replaced to meet the test requirements, but this method cannot cover all application scenarios and carries the risk of differential-mode or common-mode failure. The first method requires additional steps; the second method cannot guarantee compliance with all application scenarios and increases material costs. Utility Model Content

[0004] The main objective of this invention is to propose an electronic device that addresses the problem of increased costs associated with existing electronic devices simultaneously meeting insulation withstand voltage and surge test requirements.

[0005] To achieve the above objectives, this utility model proposes an electronic device comprising:

[0006] A housing, the housing being grounded, and having a receiving cavity and a mounting hole communicating with the receiving cavity;

[0007] A circuit board is disposed in the receiving cavity. The circuit board is provided with a surge protection circuit and a surge grounding terminal. The surge grounding terminal is electrically connected to the surge protection circuit and is spaced apart from the housing.

[0008] A conductive fastener is provided, which can be detachably connected to the surge grounding terminal through the mounting hole, so that the surge protection circuit can be connected to or disconnected from the housing.

[0009] In one embodiment, the surge grounding terminal includes a terminal body and pins disposed on both sides of the terminal body, the pins being soldered and fixed to the circuit board.

[0010] In one embodiment, the circuit board has a through hole corresponding to the mounting hole, the surge grounding terminal is located on the side of the circuit board away from the housing, and the conductive fastener passes through the mounting hole and the through hole in sequence to connect with the surge grounding terminal.

[0011] In one embodiment, the circuit board is provided with a mounting portion, which is bendably connected to the circuit board. The mounting portion is provided with a through hole corresponding to the mounting hole, and at least a portion of the surge grounding terminal is disposed in the through hole and welded to the circuit board.

[0012] In one embodiment, the surge grounding terminal has a connection portion for connecting to the conductive fastener.

[0013] In one embodiment, the connection portion is a threaded hole, and the conductive fastener is screwed to the surge grounding terminal.

[0014] In one embodiment, the surge grounding terminal is a crimped stud.

[0015] In one embodiment, the conductive fastener includes a connected screw head and a screw rod, the diameter of the screw head being larger than the diameter of the screw rod and the diameter of the mounting hole being larger than the diameter of the mounting hole. The screw head is used to connect to the housing, and the screw rod passes through the mounting hole and is connected to the surge grounding terminal.

[0016] In one embodiment, a copper layer is laid on the surface of the circuit board facing the housing at a predetermined position, and a grounding circuit that is electrically connected to the copper layer is also provided on the circuit board;

[0017] The housing has a protruding abutment post on one side facing the circuit board; and / or, the abutment post is annularly arranged, and the mounting hole is formed in the middle of the abutment post; wherein:

[0018] The abutment post is used to abut against the circuit board and is electrically connected to the copper layer so that the housing is grounded.

[0019] In one embodiment, the surge protection circuit includes a varistor and a gas discharge tube, wherein the varistor, the gas discharge tube, and the surge grounding terminal are connected in series.

[0020] The technical solution of this utility model, through such a setting, allows electronic devices to undergo insulation withstand voltage testing and surge testing by simply removing and installing conductive fasteners on the housing to change the state of the surge protection circuit on the circuit board. This ensures that the electronic device can simultaneously meet the test conditions for insulation withstand voltage testing and surge testing without increasing the number of processes, components, or costs. Furthermore, this setting can further secure the circuit board through the interaction of the conductive fasteners and the surge grounding terminal. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of an embodiment of the electronic device provided by this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the exploded disassembly structure of an electronic device in China;

[0024] Figure 3 A schematic diagram of the structure of a circuit board according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the circuit board mounting structure.

[0026] Explanation of icon numbers:

[0027] 1. Electronic equipment; 10. Housing; 11. Mounting hole; 12. Abutment post; 20. Circuit board; 21. Through hole; 22. Mounting part; 30. Surge grounding terminal; 31. Threaded hole; 32. Pin; 40. Conductive fastener; 41. Screw head; 42. Screw.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] Currently, to enable electronic devices to simultaneously undergo insulation withstand voltage testing and surge testing, the following two methods are generally adopted: First, the electronic device needs to be temporarily removed during the insulation withstand voltage test and reinstalled after the test; second, the topology of the electronic device is changed to meet the above test requirements. However, adopting either of these methods will lead to an increase in the cost of the electronic device.

[0033] This utility model proposes an electronic device 1.

[0034] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the electronic device 1 includes a housing 10, a circuit board 20, a surge grounding terminal 30, and a conductive fastener 40. The housing 10 is grounded and has a receiving cavity and a mounting hole 11 communicating with the receiving cavity. The circuit board 20 is disposed in the receiving cavity and has a surge protection circuit and a surge grounding terminal 30. The surge grounding terminal 30 is electrically connected to the surge protection circuit and is spaced apart from the housing 10. The conductive fastener 40 can pass through the mounting hole 11 and be detachably connected to the surge grounding terminal 30 so that the surge protection circuit can be connected to or disconnected from the housing 10. To facilitate the distinction between the surge protection circuit and the two different states of the housing 10, they are referred to as the first state and the second state. In the first state, the conductive fastener 40 is located outside the housing 10 and is separated from the surge grounding terminal 30. That is, the surge protection circuit is disconnected from the housing 10, which belongs to the ground, because the surge grounding terminal 30 is directly suspended inside the housing 10. In the second state, the conductive fastener 40 passes through the mounting hole 11 and connects to the surge grounding terminal 30, so that the surge grounding terminal 30 and the housing 10 are electrically connected, and the surge protection circuit can be electrically connected to the housing 10, which belongs to the ground, through the surge grounding terminal 30.

[0035] The electronic device 1 in this utility model includes a housing 10, a circuit board 20, a surge grounding terminal 30, and conductive fasteners 40. The housing 10 has a receiving cavity and a mounting hole 11 connected to the receiving cavity. The circuit board 20 is disposed within the receiving cavity. In this embodiment, the circuit board 20 is equipped with a surge protection circuit and a surge grounding terminal 30. The circuit board 20 also has other functional circuits. The surge protection circuit primarily protects the other functional circuits on the circuit board 20 from damage, such as during switching operations, electrostatic discharge, power grid fluctuations, and lightning strikes. In this embodiment, the surge grounding terminal 30 is disposed on the circuit board 20, which is the grounding terminal of the surge protection circuit. To ensure the surge protection circuit operates normally, it is connected to the surge grounding terminal 30, forming a conductive circuit. In this embodiment, since the surge grounding terminal 30 is spaced apart from the housing 10, it is not currently grounded and is disconnected from the ground. To enable the surge grounding terminal 30 to connect to the housing 10, which represents ground, a conductive fastener 40 is also provided. This conductive fastener 40 is a metal component with good conductivity and is detachably disposed on the housing 10. In this embodiment, the conductive fastener 40 enables the surge protection circuit to have a first state and a second state. In the first state, the conductive fastener 40 is not installed on the housing 10, that is, it is located outside the housing 10. At this time, the conductive fastener 40 is not connected to the housing 10 and the surge grounding terminal 30. Therefore, the surge grounding terminal 30 provided on the circuit board 20 is in an unbroken state with the housing 10, which serves as ground. In the second state, the conductive fastener 40 passes through the mounting hole 11 provided on the housing 10 and connects to the surge grounding terminal 30, so that the surge protection circuit provided on the circuit board 20 forms a conductive state with the housing 10 through the conductive fastener 40, that is, the grounding connection is completed. This setting takes into account that the existing electronic equipment 1 needs to undergo insulation withstand voltage test and surge test before being put into the market for sale or use. During the insulation withstand voltage test, since the circuit board 20 is provided with a surge protection circuit, given the characteristics of the surge protection circuit, when the parameter value of the insulation withstand voltage test is greater than the parameter value of the surge protection circuit, the insulation withstand voltage test will fail, while the surge test will pass.In this embodiment, when performing an insulation withstand voltage test on the electronic device 1, the conductive fastener 40 can be left uninstalled initially, so that the grounding line of the surge protection circuit on the circuit board 20 is in an open state, that is, the surge protection circuit is in the first state described above. This ensures that the surge protection circuit on the circuit board 20 does not affect the insulation withstand voltage test of the electronic device 1. However, when performing a surge test, the conductive fastener 40 can be installed on the housing 10, so that the surge grounding terminal 30 is electrically connected to the housing 10 through the conductive fastener 40, that is, the surge protection circuit is in the second state described above. This configuration allows electronic device 1 to pass surge tests smoothly. During insulation withstand voltage and surge tests, the state of the surge protection circuit on circuit board 20 can be changed simply by removing or installing the conductive fasteners 40 on housing 10. This ensures that electronic device 1 meets both insulation withstand voltage and surge test conditions without increasing the number of processes, components, or costs. Furthermore, this configuration allows for further securing of circuit board 20 through the interaction of conductive fasteners 40 and surge grounding terminal 30.

[0036] In one embodiment, the surge grounding terminal 30 includes a terminal body and pins 32 disposed on both sides of the terminal body, the pins 32 being soldered and fixed to the circuit board 20. Figure 1 and Figure 2 As shown, in this embodiment, the surge grounding terminal 30 includes a terminal body and pins 32 disposed on both sides of the terminal body. The pins 32 are fixed to the circuit board 20 by soldering. The pins 32 are used to solder to the grounding terminal of the circuit board 20 and / or the surge protection circuit on the circuit board 20, so that the grounding terminal of the circuit board 20 and / or the surge protection circuit on the circuit board 20 is fixedly connected to the surge grounding terminal 30. In this embodiment, the distance between the two pins 32 shall not be less than the creepage distance.

[0037] In one embodiment, the circuit board 20 has a through hole 21 corresponding to the mounting hole 11, the surge grounding terminal 30 is located on the side of the circuit board 20 away from the housing 10, and the conductive fastener 40 passes through the mounting hole 11 and the through hole 21 in sequence to connect with the surge grounding terminal 30. Figure 1 and Figure 2As shown, in order to further enhance the positioning effect of the circuit board 20 by cooperating with the conductive fastener 40 and the surge grounding terminal 30, in this embodiment, a through hole 21 is provided on the circuit board 20, and the surge grounding terminal 30 is disposed on the side of the circuit board 20 away from the housing 10, so that the conductive fastener 40 passes through the mounting hole 11 of the housing 10 and the through hole 21 of the circuit board 20 in sequence and connects with the surge grounding terminal 30. That is to say, in this embodiment, the circuit board 20 is disposed between the surge grounding terminal 30 and the housing 10. With this arrangement, the positioning effect of the housing 10 and the surge grounding terminal 30 on the circuit board 20 can be enhanced by the conductive fastener 40. In other embodiments, the surge grounding terminal 30 is disposed on the side of the circuit board 20 facing the housing 10 (not shown in the figure), provided that it is spaced apart from the housing 10. In order to enable the conductive fastener 40 to be connected to the surge grounding terminal 30, in this embodiment, the mounting hole 11 is opened on the edge of the housing 10 perpendicular to the circuit board 20, that is, the mounting hole 11 and the surge grounding terminal 30 are arranged in the horizontal direction, and the conductive fastener 40 is inserted into the receiving cavity through the mounting hole 11 in the horizontal direction and connected to the surge grounding terminal 30. The specific arrangement of the surge grounding terminal 30 is not limited in much.

[0038] In another embodiment, the circuit board 20 is provided with a mounting portion 22, which is bendably connected to the circuit board 20. The mounting portion 22 is provided with a through hole 21 corresponding to the mounting hole 11, and at least a portion of the surge grounding terminal 30 is disposed within the through hole 21 and soldered to the circuit board 20. Figure 3 and Figure 4 As shown, in this embodiment, the circuit board 20 is provided with a mounting part 22, which is bendably connected to the circuit board 20. A through hole 21 is provided at the free end of the mounting part 22. The through hole 21 is used for the surge grounding terminal 30 to pass through and be installed. The surge grounding terminal 30 is also fixed to the circuit board 20 by welding. In this embodiment, since other parts of the circuit board 20 are already fixed, when the conductive fastener 40 passes through the mounting hole 11 and connects with the surge grounding terminal 30 installed in the through hole 21, the mounting part 22 can deform to meet the requirement of connecting the surge grounding terminal 30 on the circuit board 20 to the housing 10 through the conductive fastener 40.

[0039] In one embodiment, the surge grounding terminal 30 has a connecting portion for connecting with the conductive fastener 40. In this embodiment, the surge grounding terminal 30 has a connecting portion, which is mainly used for connecting with the conductive fastener 40. This connecting portion can be a threaded hole 31, a snap-fit ​​groove, or a snap-fit ​​protrusion, etc., while the conductive fastener 40 is configured as a threaded post, snap-fit ​​post, or snap-fit ​​groove that cooperates with the connecting portion; no further limitations are imposed on this.

[0040] In one embodiment, the connecting portion is a threaded hole 31, and the conductive fastener 40 is screwed to the surge grounding terminal 30. For example... Figure 1 As shown, in this embodiment, the connecting part is a threaded hole 31, and the conductive fastener 40 is provided with a threaded post that matches it. The conductive fastener 40 can pass through the mounting hole 11 and be screwed into the threaded hole 31 provided on the surge grounding terminal 30. This arrangement makes the connection between the conductive fastener 40 and the surge grounding terminal 30 more secure and makes the positioning effect of the circuit board 20 more stable.

[0041] In one embodiment, the surge grounding terminal 30 is a press-fit stud. This configuration not only meets the conductivity requirements but also the creepage distance requirements.

[0042] In one embodiment, the conductive fastener 40 includes a screw head 41 and a screw 42 connected together. The diameter of the screw head 41 is larger than the diameter of the screw 42, and the diameter of the screw head 41 is larger than the diameter of the mounting hole 11. The screw head 41 is used to connect to the housing 10, and the screw 42 passes through the mounting hole 11 and is connected to the surge grounding terminal 30. Figure 2 As shown, in this embodiment, the conductive fastener 40 has good conductivity. The conductive fastener 40 includes a screw head 41 and a screw 42 connected together. The diameter of the screw head 41 is larger than the diameter of the mounting hole 11, while the diameter of the screw 42 needs to be no larger than the diameter of the mounting hole 11. When the conductive fastener 40 is installed on the housing 10, the screw head 41 of the conductive fastener 40 abuts against the housing 10, and the screw 42 of the conductive fastener 40 passes through the mounting hole 11 and is connected to the surge grounding terminal 30.

[0043] In one embodiment, a copper layer is laid on the surface of the circuit board 20 facing the housing 10 at a predetermined position, and a grounding circuit conductively connected to the copper layer is also provided on the circuit board 20; a contact post 12 protrudes from one side of the housing 10 facing the circuit board 20, and / or the contact post 12 is arranged in a ring shape, and the mounting hole 11 is opened in the middle of the contact post 12; the contact post 12 is used to abut against the circuit board 20 and is conductively connected to the copper layer, so that the housing 10 is grounded. Figure 2As shown, to achieve better positioning of the circuit board 20 with the cooperation of the conductive fastener 40 and the surge grounding terminal 30, in this embodiment, an abutment post 12 protrudes from the side of the housing 10 facing the circuit board 20. This abutment post 12 can be used to abut the circuit board 20, so that other parts of the circuit board 20 have a gap with the housing 10. To enable the circuit board 20 to achieve grounding protection even after being installed in the housing 10, in another embodiment, a copper layer is laid on the surface of the circuit board 20 facing the housing 10 where the mounting hole 11 is opened. This copper layer is used as the power grounding protection line of the circuit board 20. When the abutment post 12 abuts against the circuit board 20, the abutment post 12 actually abuts against the copper layer, that is, the abutment post 12 and the copper layer are electrically connected. In this way, the circuit board 20 can achieve the function of grounding protection through the housing 10 by abutting against the abutment post 12. In other embodiments, the abutment post 12 is arranged in a ring shape, and the mounting hole 11 is located in the middle of the abutment post 12. This arrangement can enhance the connection stability between the abutment post 12 and the circuit board 20.

[0044] In one embodiment, the surge protection circuit includes a varistor and a gas discharge tube, which are connected in series with the surge grounding terminal 30. Of course, the surge protection circuit may also include other electrical components, but no further limitations are imposed.

[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electronic device, characterized in that, include: A housing, the housing being grounded, and having a receiving cavity and a mounting hole communicating with the receiving cavity; A circuit board is disposed in the receiving cavity. The circuit board is provided with a surge protection circuit and a surge grounding terminal. The surge grounding terminal is electrically connected to the surge protection circuit and is spaced apart from the housing. as well as, A conductive fastener is provided, which can be detachably connected to the surge grounding terminal through the mounting hole, so that the surge protection circuit can be connected to or disconnected from the housing.

2. The electronic device of claim 1, wherein, The surge grounding terminal includes a terminal body and pins located on both sides of the terminal body, and the pins are soldered and fixed to the circuit board.

3. The electronic device of claim 2, wherein, The circuit board has a through hole corresponding to the mounting hole, and the surge grounding terminal is located on the side of the circuit board away from the housing. The conductive fastener passes through the mounting hole and the through hole in sequence and is connected to the surge grounding terminal.

4. The electronic device of claim 1, wherein, The circuit board is provided with a mounting part, which is bendably connected to the circuit board. The mounting part is provided with a through hole corresponding to the mounting hole, and at least part of the surge grounding terminal is disposed in the through hole and welded to the circuit board.

5. The electronic device as claimed in claim 1, characterized in that, The surge grounding terminal has a connection portion for connecting to the conductive fastener.

6. The electronic device of claim 5, wherein, The connecting part is a threaded hole, and the conductive fastener is screwed to the surge grounding terminal.

7. The electronic device of claim 6, wherein, The surge grounding terminal is a press-fit stud.

8. The electronic device of claim 1, wherein, The conductive fastener includes a connected screw head and a screw rod. The diameter of the screw head is larger than the diameter of the screw rod and the diameter of the mounting hole. The screw head is used to connect with the housing, and the screw rod passes through the mounting hole and is connected to the surge grounding terminal.

9. The electronic device of any one of claims 1 to 8, wherein, A copper layer is laid on the surface of the circuit board facing the housing at a predetermined position, and a grounding circuit that is electrically connected to the copper layer is also provided on the circuit board; The housing has a protruding abutment post on one side facing the circuit board; and / or, the abutment post is annularly arranged, and the mounting hole is formed in the middle of the abutment post; wherein: The abutment post is used to abut against the circuit board and is electrically connected to the copper layer so that the housing is grounded.

10. The electronic device of any one of claims 1 to 8, wherein, The surge protection circuit includes a varistor and a gas discharge tube, which are connected in series with the surge grounding terminal.

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