Signal switching structure

Abstract

The invention relates to the technical field of signal switching, in particular to a signal switching structure, and solves the problems that in the prior art, a signal switching and assembling structure of an AC / DC circuit board is complex in assembling process, and assembling consistency is difficult to guarantee. The AC power terminal and the DC power terminal are installed in the socket shell, the low-voltage connector is used for collecting and leading out temperature signals, a DC cavity and an AC cavity are formed in the socket shell, the side edges of the DC cavity and the side edges of the AC cavity are communicated, and a circuit board assembly is arranged in the socket shell; the circuit board assembly comprises an AC circuit board installed in the AC cavity and a DC circuit board installed in the DC cavity, and the AC circuit board and the DC circuit board are electrically interconnected and mechanically fixed through a plug-in. The integrated circuit board assembly has the advantages that the AC circuit board and the DC circuit board are connected and fixed in advance through the plug-in to form the integrated circuit board assembly, synchronous assembly of the AC circuit board and the DC circuit board is achieved through the integrated structure, the assembly process is simplified, and deviation accumulation caused by step-by-step assembly is avoided.

Description

Technical Field

[0001] This invention relates to the field of signal switching technology, and in particular to a signal switching structure. Background Technology

[0002] In the signal transmission system of electronic devices, AC circuit boards and DC circuit boards are the core components for signal conversion and transmission. The design of the signal conversion structure between them directly affects the assembly efficiency, assembly consistency, and signal transmission reliability of the entire electronic device. Currently, the signal conversion and assembly methods between AC / DC circuit boards have become relatively conventional technical solutions. Among them, Chinese invention patent CN120767649A, entitled "A Signal Conversion Socket," discloses a typical AC / DC circuit board signal conversion and assembly structure. The technical solution of this patent is as follows: multi-pin connectors are integrated inside the socket housing, and the AC circuit board and DC circuit board are respectively installed in different cavities of the socket housing. The signal conversion between the AC / DC circuit boards is achieved by correspondingly inserting the multi-pin connectors on the two circuit boards through the multi-pin connectors inside the housing.

[0003] The technical solutions disclosed in the aforementioned existing patents still have the following urgent technical problems to be solved in practical applications:

[0004] On the one hand, existing patented technologies require first assembling the AC circuit board separately into the corresponding cavity of the socket housing, then assembling the DC circuit board separately into another cavity, and finally connecting the two circuit boards through pre-set pins inside the housing. This assembly method requires completing the positioning, installation, and connection of the two circuit boards step by step, which is cumbersome. Moreover, deviations in each assembly step accumulate, making it difficult to guarantee the alignment accuracy between the two circuit boards, resulting in poor assembly consistency. At the same time, step-by-step assembly increases the number of assembly steps, significantly reducing the overall assembly efficiency. This defect is even more prominent in mass production, greatly increasing manufacturing costs.

[0005] On the other hand, in existing patented technologies, signal switching between AC / DC circuit boards relies entirely on the insertion of pins and connectors. This insertion connection is a mechanical contact connection, and its reliability is affected by various factors such as assembly precision, contact pressure, and the operating environment. During long-term use, external factors such as equipment vibration and temperature changes can easily cause loosening of the contact between the pins and connectors, leading to signal transmission interruptions, signal attenuation, and poor signal transmission stability. Furthermore, the contact gap in the insertion connection easily introduces external electromagnetic interference, resulting in weak signal anti-interference capabilities and making it difficult to meet the requirements for high-precision, high-stability signal transmission. It is particularly unsuitable for applications with frequent vibrations and complex electromagnetic environments. Summary of the Invention

[0006] This invention proposes a signal switching structure that solves the problems of complex assembly process, difficulty in ensuring assembly consistency, low assembly efficiency, easy loosening of signal switching and unstable signal transmission in the signal switching and assembly structure of existing AC / DC circuit boards.

[0007] The technical solution of this invention is implemented as follows:

[0008] A signal conversion structure includes a socket housing, AC power terminals and DC power terminals installed within the socket housing, and a low-voltage connector for collecting and extracting temperature signals. The socket housing has a side-connected DC cavity and an AC cavity. The AC power terminals and the low-voltage connector are installed within the AC cavity, and the DC power terminals are installed within the DC cavity. A circuit board assembly is also located within the socket housing, and a temperature sensing component is provided on the circuit board assembly to measure the temperature of the DC power terminals and the AC power terminals. The circuit board assembly includes an AC circuit board installed within the AC cavity and a DC circuit board installed within the DC cavity. The AC circuit board and the DC circuit board are electrically interconnected and mechanically fixed via plug-in connectors. The AC circuit board and the DC circuit board form an integrated structure, enabling synchronous assembly of the two circuit boards, simplifying the assembly process and improving assembly consistency.

[0009] The plug-in includes an insulated support and pin headers fixed to the support. The two ends of the pin headers extend out of the support and connect to the AC and DC circuit boards, respectively, ensuring the continuity and reliability of signal transmission.

[0010] The support component includes two insulating plates arranged parallel to each other and spaced apart along the length of the plug. Pin headers are arranged in a matrix perpendicular to the insulating plates, and are fixed to both insulating plates. The matrix is ​​2 rows × 4 columns. The two insulating plates allow for flexible adjustment of the mounting spacing between the AC and DC circuit boards, adapting to the spatial layout within the socket housing, while also enhancing the mounting stability of the pin headers and preventing bending deformation under stress. The matrix-arranged pin headers form a robust three-dimensional connection frame, achieving not only a stable electrical connection between the AC and DC circuit boards but also providing reliable mechanical support, thus ensuring the electrical and mechanical reliability of the interconnection.

[0011] The two ends of the pin header are respectively inserted into corresponding through holes on the AC circuit board and the DC circuit board and soldered in place. Soldering can further improve the stability of signal switching, effectively preventing connection loosening caused by external factors such as vibration and temperature changes, and also enhancing the anti-interference capability of signal transmission, ensuring stable and attenuated signal transmission.

[0012] The temperature sensing component includes a surface-mount thermistor, an AC heat-conducting block mounted on the AC circuit board, and a DC heat-conducting block mounted on the DC circuit board. Both the AC and DC circuit boards have surface-mount thermistors. The surface-mount thermistors are thermally coupled to the AC power terminals via the AC heat-conducting block, and to the DC power terminals via the DC heat-conducting block. This enables accurate detection of the operating temperature of the two power terminals.

[0013] The heat-conducting surfaces of the AC heat-conducting block and the AC power terminal, as well as the heat-conducting surfaces of the DC heat-conducting block and the DC power terminal, are both curved surfaces. The curved surfaces increase the contact area between the heat-conducting block and the cylindrical power terminal, improving heat conduction efficiency and thus enhancing temperature measurement accuracy. Simultaneously, the curved surface design prevents frictional damage to the power terminal surface from the heat-conducting block, extending the product's lifespan.

[0014] The socket housing contains positioning posts, and the AC and DC circuit boards have positioning holes that correspond one-to-one with the positioning posts. The circuit board assembly is fixed to the socket housing by a first screw that passes through the positioning hole and is screwed into the positioning post. A washer is provided between the head of the first screw and the circuit board assembly. The cooperation between the positioning post and the positioning hole ensures the installation accuracy and reliable fixation of the circuit board assembly within the socket housing.

[0015] The socket housing is connected to a tail cap at its rear. The tail cap is initially secured to the socket housing via a snap-fit ​​mechanism, and then further secured by a second screw. This double-fixing structure ensures a firm connection between the tail cap and the socket housing, preventing the tail cap from loosening or falling off during use, and improving the overall sealing and stability of the structure.

[0016] The outer wall of the socket housing is provided with a buckle, and the tail cover is provided with a corresponding buckle groove. The buckle is snapped into the buckle groove to achieve the first fixation. The outer wall of the socket housing is also provided with a protrusion with a screw mounting hole. The tail cover is provided with a corresponding lug with a screw through hole. The second screw passes through the screw through hole and is screwed into the screw mounting hole to achieve the second fixation.

[0017] The tail cap has AC terminal mounting holes for AC power terminals and DC terminal mounting holes for DC power terminals. The inner walls of both the AC and DC terminal mounting holes are provided with multiple cantilevered claws spaced circumferentially. The AC and DC power terminals each have a positioning surface facing the tail. After the positioning surface passes the corresponding cantilevered claw, it is stopped from the rear by the cantilevered claw. The cantilevered claws enable axial positioning of the power terminals, preventing axial displacement during operation and ensuring the stability of the connection between the power terminals and the circuit board assembly and external devices.

[0018] The beneficial effects of this invention are as follows: This invention pre-connects and fixes the AC circuit board and the DC circuit board through plug-in to form an integrated circuit board assembly. This integrated structure realizes the synchronous assembly of the AC circuit board and the DC circuit board, thereby simplifying the assembly process, avoiding the accumulation of deviations caused by step assembly, and significantly improving assembly efficiency and assembly consistency.

[0019] The pin headers in the connector are arranged in a matrix and fixed to two insulating plates, forming a robust three-dimensional connection frame. This provides reliable mechanical support for the two circuit boards and prevents loosening due to vibration or other factors. The pin headers are fixed to the two circuit boards by soldering, eliminating contact resistance variations and signal attenuation caused by mechanical contact gaps. This establishes a stable and continuous electrical connection, effectively improving signal transmission stability and anti-interference capabilities. The two parallel, spaced insulating plates in the connector allow for flexible adjustment of the mounting spacing between the AC and DC circuit boards within a certain range. This enables the circuit board assembly to adapt to different spatial layouts within the socket housing, enhancing the versatility and flexibility of the structure.

[0020] At the same time, the precise matching of the positioning pins and positioning holes ensures assembly consistency, reduces assembly deviations during mass production, and lowers manufacturing costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an exploded view of a signal switching structure according to the present invention;

[0023] Figure 2 This is a schematic diagram of the socket housing structure;

[0024] Figure 3 This is a schematic diagram of the tail cap structure;

[0025] Figure 4 Schematic diagram of circuit board assembly structure Figure 1 ;

[0026] Figure 5 Schematic diagram of circuit board assembly structure Figure 2 ;

[0027] Figure 6 A schematic diagram of the circuit board assembly structure after the heat-conducting block is assembled;

[0028] Figure 7This is a schematic diagram of DC and AC signal transmission;

[0029] Figure 8 This is a cross-sectional view of the signal transfer structure.

[0030] In the diagram: 1. Socket housing; 2. Low-voltage signal terminal; 3. Circuit board assembly; 4. AC heat sink; 5. DC heat sink; 6. First screw; 7. Panel sealing ring; 8. Tail cap; 9. Second screw; 10. AC power terminal; 11. DC power terminal.

[0031] 101. Panel; 102. Sealing ring groove; 103. DC cavity; 104. Buckle; 105. Positioning rib; 106. Protruding post; 107. AC housing; 108. AC cavity; 109. Positioning pin.

[0032] 31. AC circuit board; 32. Low-voltage connector; 33. Plug-in; 34. DC circuit board; 35. Terminal hole; 36. Positioning hole; 37. Surface mount thermistor; 331. Insulating board; 332. Pin header.

[0033] 801, Snap-on slot; 802, Positioning retainer; 803, Lug; 804, AC terminal mounting hole; 805, DC terminal mounting hole; 806, Cantilever spring claw. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The signal switching structure of the present invention is particularly suitable for charging sockets of new energy vehicles, used to monitor the temperature of AC power terminals and DC power terminals, and stably transmit the monitoring signal to an external controller.

[0036] Figure 1 The overall structure of the present invention is shown in Embodiment 1, as follows. Figures 1-8As shown, this invention provides a signal conversion structure, including a socket housing 1, an AC power terminal 10 and a DC power terminal 11 installed within the socket housing 1, and a low-voltage connector 32 for collecting and outputting temperature signals. The socket housing 1 has a DC cavity 103 and an AC cavity 108 with side connections. The AC power terminal 10 and the low-voltage connector 32 are installed within the AC cavity 108, and the DC power terminal 11 is installed within the DC cavity 103. A circuit board assembly 3 is provided within the socket housing 1. The circuit board assembly 3 has a temperature sensing component for measuring the temperature of the DC power terminal 11 and the AC power terminal 10. The temperature signal generated by the temperature sensing component is transmitted to the low-voltage connector 32 and output through the circuit board assembly 3. The circuit board assembly 3 includes an AC circuit board 31 installed within the AC cavity 108 and a DC circuit board 34 installed within the DC cavity 103. The AC circuit board 31 and the DC circuit board 34 are electrically interconnected and mechanically fixed through a plug 33. By connecting the AC circuit board 31 and the DC circuit board 34 into a single unit before assembly using plug-in 33, synchronous assembly of the AC circuit board 31 and the DC circuit board 34 is achieved. This not only simplifies the assembly steps and improves assembly efficiency, but also avoids the misalignment problem caused by the accumulation of positioning deviations in step-by-step assembly, significantly improving assembly consistency. At the same time, the rigid connection provided by plug-in 33 provides stable mechanical support and continuous and reliable electrical connection between the two circuit boards, fundamentally overcoming the defects of traditional plug-in methods such as easy loosening and unstable signal transmission.

[0037] In this embodiment, the plug-in 33 includes an insulated support and pin headers 332 fixed on the support. Both ends of the pin headers 332 extend out of the support and connect to the AC circuit board 31 and the DC circuit board 34, respectively. This design ensures that the signal transmission path between the AC circuit board 31 and the DC circuit board 34 is direct and continuous, avoiding signal attenuation and interference risks caused by intermediate conversion stages. Specifically, the temperature signal transmission path of the DC power terminal 11 is as follows: the temperature sensing component monitors the temperature of the DC power terminal 11 and generates a temperature signal. The temperature signal is transmitted sequentially through the DC circuit board 34, the plug-in 33, and the AC circuit board 31 to the low-voltage connector. By fixing and connecting the two circuit boards with the plug-in 33, the temperature sensing signal from the DC circuit board 34 is stably transferred to the AC circuit board 31.

[0038] like Figure 4 , Figure 7As shown, the support for the plug-in 33 comprises two parallel and spaced insulating plates 331 arranged along the length of the plug-in 33. Pin headers 332 are arranged in a matrix perpendicular to the insulating plates 331, and are fixed through and to the two insulating plates 331. Preferably, the matrix is ​​a 2-row × 4-column matrix, forming a robust three-dimensional connection frame. The two insulating plates 331 not only provide precise positioning and insulation protection for the pin headers 332, but their spaced arrangement also allows for an adjustable mounting distance between the AC circuit board 31 and the DC circuit board 34. By selecting insulating plates 331 of different sizes or adjusting the relative positions of the two insulating plates 331, different spatial layouts within the socket housing 1 can be flexibly adapted, enhancing the versatility and flexibility of the adapter structure. Figure 4 , Figure 7 Besides the structure shown, the support can also be other forms of insulating frames, as long as they can provide stable support and positioning for the pin header 332. In contrast, the double insulating plate 331 has a simple and reliable structure, and is easy to manufacture and adjust the spacing.

[0039] In this embodiment, the two ends of the pin header 332 are respectively inserted into corresponding through holes on the AC circuit board 31 and the DC circuit board 34 and soldered to secure them. Soldering completely eliminates the inherent contact resistance variations and poor contact risks of mechanical contact connections, ensuring long-term stability and reliability of signal transmission, and effectively resisting the effects of harsh environments such as vibration and temperature cycling. The number of pin headers 332 can be configured according to the actual number of signal channels to be transmitted, such as increasing or decreasing the number of rows or columns, reflecting the modularity and scalability advantages of the plug-in 33 design.

[0040] In this embodiment, the temperature sensing component includes a surface-mount thermistor 37, an AC heat-conducting block 4 disposed on the AC circuit board 31, and a DC heat-conducting block 5 disposed on the DC circuit board 34. Both the AC circuit board 31 and the DC circuit board 34 are equipped with surface-mount thermistors 37. The surface-mount thermistors 37 are thermally coupled to the AC power terminal 10 through the AC heat-conducting block 4, and thermally coupled to the DC power terminal 11 through the DC heat-conducting block 5. Specifically, the heat generated by the AC power terminal 10 and the DC power terminal 11 during operation is efficiently conducted to the corresponding surface-mount thermistor 37 through the AC heat-conducting block 4 and the DC heat-conducting block 5, which are in close contact with it. The resistance value of the surface-mount thermistor 37 changes accordingly, and this change signal is processed by the circuit on its circuit board (AC circuit board 31 or DC circuit board 34). The temperature signal of the DC power terminal 11 sensed by the surface-mount thermistor 37 on the DC circuit board 34 is transmitted to the AC circuit board 31 through the pin header 332 in the plug-in 33. The signal is then combined with the temperature signal of the AC power terminal 10 sensed by the AC circuit board 31 itself, and finally led out to the outside through the low-voltage connector 32. This design simplifies the signal lead-out path and reduces the use of wiring harnesses.

[0041] Furthermore, such as Figure 6 As shown, the heat-conducting surfaces of the AC heat-conducting block 4 and the AC power terminal 10, and the DC heat-conducting block 5 and the DC power terminal 11, are both curved surfaces. Since the AC power terminal 10 and the DC power terminal 11 are typically cylindrical, the curved surface design increases the contact area between the heat-conducting block and the cylindrical surface of the power terminal, significantly improving heat transfer efficiency and thus enhancing the accuracy and response speed of temperature detection. Furthermore, the curved surface contact, being a surface contact, effectively avoids scratches or wear on the power terminal surface during assembly and use compared to edge contact, extending the product's lifespan.

[0042] In this embodiment, the socket housing 1 is provided with positioning posts 109, and the AC circuit board 31 and DC circuit board 34 are provided with positioning holes 36 that correspond one-to-one with the positioning posts 109. Figure 2 and Figure 5 As shown, during assembly, the circuit board assembly 3 aligns with the positioning pin 109 inside the socket housing 1 via its positioning hole 36, achieving precise pre-positioning. Then, the circuit board assembly 3 is firmly fixed to the socket housing 1 by a first screw 6 that passes through the positioning hole 36 and is screwed into the positioning pin 109. A washer is provided between the head of the first screw 6 and the circuit board assembly 3 to prevent damage to the circuit board and ensure uniform tightening force. The engagement between the positioning pin 109 and the positioning hole 36 ensures the installation accuracy and repeatability of the circuit board assembly 3 within the socket housing 1, and is a key structure for ensuring assembly quality.

[0043] In this embodiment, the AC circuit board 31 is provided with terminal holes 35, and the AC power terminal 10 passes through the terminal holes 35 during installation.

[0044] In Example 2, based on Example 1, a tail cover 8 is connected to the tail of the socket housing 1. The tail cover 8 is first fixed to the socket housing 1 through a snap-fit ​​structure, and then fixed a second time through a second screw 9. This double fixing structure ensures the firmness and sealing of the connection between the tail cover 8 and the socket housing 1, effectively preventing the tail cover 8 from loosening during long-term use or under vibration.

[0045] Specifically, such as Figure 2 , Figure 3 As shown, the outer wall of the socket housing 1 is provided with a snap fastener 104, and the tail cover 8 is provided with a corresponding snap fastener groove 801. During assembly, the tail cover 8 is snapped onto the socket housing 1, and the snap fastener 104 snaps into the snap fastener groove 801 to achieve the first quick fixation. This step requires no tools and is convenient for assembly. The outer wall of the socket housing 1 is also provided with a protrusion 106, which has a screw mounting hole. The tail cover 8 is provided with a corresponding lug 803, which has a screw through hole. After the snap fastener is fixed, the lug 803 is aligned with the protrusion 106, and a second screw 9 is passed through the screw through hole and screwed into the screw mounting hole to achieve a second secure screw fixation, thus completing the final installation of the tail cover 8. This combination of snap fasteners and screws simplifies the assembly process and ensures the reliability of the final connection.

[0046] In addition, the tail cover 8 is provided with a positioning baffle 802, and the socket housing 1 is provided with a positioning rib 105. During the assembly process of the tail cover 8 and the socket housing 1, the positioning rib 105 cooperates with the positioning baffle to ensure that the tail cover is installed in the correct direction.

[0047] Furthermore, the tail cover 8 is provided with an AC terminal mounting hole 804 for the AC power terminal 10 to pass through and a DC terminal mounting hole 805 for the DC power terminal 11 to pass through. The inner walls of both the AC terminal mounting hole 804 and the DC terminal mounting hole 805 are provided with multiple cantilever claws 806 spaced circumferentially. The AC power terminal 10 and the DC power terminal 11 are respectively provided with positioning surfaces facing the tail (i.e., AC terminal positioning surface and DC terminal positioning surface). When the AC power terminal 10 and the DC power terminal 11 are inserted into the corresponding mounting holes from the front (inside the socket) of the tail cover 8, their positioning surfaces will press against and pass over the cantilever claws 806. Once the positioning surfaces have completely passed over the cantilever claws 806, the cantilever claws 806 spring back under their own elastic force and stop the positioning surfaces from the rear, thereby preventing the power terminals from retracting. This achieves reliable axial positioning of the power terminals and ensures the stability of their electrical connection with the corresponding terminal holes 35 on the circuit board assembly 3.

[0048] In this embodiment, the socket housing 1 is provided with an AC housing 107, and an AC cavity 108 is disposed in the AC housing 107. The AC housing 107 is fixedly disposed in the socket housing 1 by screws.

[0049] In summary, the signal transfer structure of the present invention, through an integrated circuit board assembly design, combined with features such as plug-in soldering fixation, adjustable spacing, precise positioning, and double fixation of the tail cover, achieves simplification in structure, high efficiency and consistency in assembly, and ensures long-term stable and reliable signal transmission and mechanical connection in performance.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A signal conversion structure, comprising a socket housing (1), AC power terminals (10) and DC power terminals (11) mounted within the socket housing (1), and a low-voltage connector (32) for collecting and extracting temperature signals, characterized in that, The socket housing (1) is provided with a DC cavity (103) and an AC cavity (108) connected on the side. The AC power terminal (10) and the low-voltage connector (32) are installed in the AC cavity (108), and the DC power terminal (11) is installed in the DC cavity (103). The socket housing (1) is provided with a circuit board assembly (3). The circuit board assembly (3) is provided with a temperature measuring component to measure the temperature of the DC power terminal (11) and the AC power terminal (10). The circuit board assembly (3) includes an AC circuit board (31) installed in the AC cavity (108) and a DC circuit board (34) installed in the DC cavity (103). The AC circuit board (31) and the DC circuit board (34) are electrically interconnected and mechanically fixed through a plug (33).

2. The signal switching structure according to claim 1, characterized in that, The plug (33) includes an insulated support and pins (332) fixed on the support. The two ends of the pins (332) extend out of the support and are connected to the AC circuit board (31) and the DC circuit board (34).

3. The signal switching structure according to claim 2, characterized in that, The support includes two insulating plates (331) arranged parallel to each other and spaced apart along the length of the plug (33), and pins (332) arranged in a matrix in a direction perpendicular to the insulating plates (331), with the pins (332) passing through and fixed on the two insulating plates (331).

4. The signal switching structure according to claim 3, characterized in that, The two ends of the pin header (332) are respectively inserted into the corresponding through holes on the AC circuit board (31) and the DC circuit board (34) and soldered to fix them.

5. The signal switching structure according to any one of claims 1 to 4, characterized in that, The temperature measuring component includes a surface-mount thermistor (37), an AC heat-conducting block (4) disposed on an AC circuit board (31), and a DC heat-conducting block (5) disposed on a DC circuit board (34). Both the AC circuit board (31) and the DC circuit board (34) are provided with surface-mount thermistors (37). The surface-mount thermistors (37) are thermally coupled to the AC power terminal (10) through the AC heat-conducting block (4), and the surface-mount thermistors (37) are thermally coupled to the DC power terminal (11) through the DC heat-conducting block (5).

6. The signal switching structure according to claim 5, characterized in that, The heat-conducting surfaces of the AC heat-conducting block (4) and the AC power terminal (10), and the DC heat-conducting block (5) and the DC power terminal (11) are both curved surfaces.

7. The signal switching structure according to claim 1 or 6, characterized in that, The socket housing (1) is provided with a positioning post (109), and the AC circuit board (31) and DC circuit board (34) are provided with positioning holes (36) that correspond to the positioning post (109).

8. The signal switching structure according to claim 7, characterized in that, The socket housing (1) is connected to a tail cover (8) at the tail end. The tail cover (8) and the socket housing (1) are fixed for the first time by a snap-fit ​​structure and fixed for the second time by a second screw (9).

9. The signal switching structure according to claim 8, characterized in that, The outer wall of the socket housing (1) is provided with a buckle (104), and the tail cover (8) is provided with a buckle groove (801) accordingly. The buckle (104) is inserted into the buckle groove (801) to achieve the first fixation. The outer wall of the socket housing (1) is also provided with a protrusion (106), the protrusion (106) is provided with a screw mounting hole, the tail cover (8) is provided with a lug (803) accordingly, the lug (803) is provided with a screw through hole, and the second screw (9) passes through the screw through hole and is screwed into the screw mounting hole to achieve the second fixation.

10. The signal switching structure according to claim 9, characterized in that, The tail cap (8) is provided with an AC terminal mounting hole (804) through which the AC power terminal (10) passes and a DC terminal mounting hole (805) through which the DC power terminal (11) passes. The inner walls of the AC terminal mounting hole (804) and the DC terminal mounting hole (805) are provided with multiple cantilever claws (806) spaced apart along the circumference. The AC power terminal (10) and the DC power terminal (11) are respectively provided with positioning surfaces facing the tail. After the positioning surfaces pass forward past the corresponding cantilever claws (806), they are stopped from the rear by the cantilever claws (806).

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