Varistor mounting structure and electrical connection device

Abstract

Disclosed in the present application are a varistor mounting structure and an electrical connection device, the electrical connection device comprising a power supply line (100) and a detection and protection apparatus provided on a circuit board and electrically connected to the power supply line (100). The detection and protection apparatus comprises a trip coil (Lx) for generating an electromagnetic force to disconnect an electrical connection, and a first varistor (ZR1) for absorbing a surge voltage. A support frame (400) for fixing the trip coil (Lx) is provided on the circuit board, and a first mounting portion (410) for mounting the first varistor (ZR1) is provided on the support frame (400). The first mounting portion (410) is provided with a first mounting hole (411) and a second mounting hole (412) for two pins of the first varistor (ZR1) to pass through respectively, and an isolation portion (413) for increasing a creepage distance is provided between the first mounting hole (411) and the second mounting hole (412).

Description

Varistor mounting structure and electrical connection equipment

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422660447.3, filed on October 31, 2024, entitled "Varistor Mounting Structure and Electrical Connection Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of circuit technology, and in particular to a varistor mounting structure and electrical connection device. Background Technology

[0004] A varistor is a non-linear overvoltage protection semiconductor device that is sensitive to voltage. Utilizing the non-linear characteristics of the varistor, when an overvoltage occurs between its two terminals, the varistor can clamp the voltage to a relatively fixed value, thereby protecting the downstream circuitry.

[0005] Most electrical devices have varistors on their circuit boards. Sufficient creepage distance is required between the two leads of the varistor to ensure its safety. However, most circuit boards currently prioritize miniaturization, neglecting the installation of varistors. This results in a smaller creepage distance between the two leads, creating significant safety hazards. Summary of the Invention

[0006] The purpose of this application is to at least solve one of the technical problems existing in the prior art, and to this end, to provide a varistor mounting structure and electrical connection device.

[0007] In a first aspect, embodiments of this application provide a varistor mounting structure for an electrical connection device, the electrical connection device including a power line and a detection and protection device disposed on a circuit board and electrically connected to the power line;

[0008] The power line includes a first current-carrying line, a second current-carrying line, a first shielding conductor structure covering the first current-carrying line, and a second shielding conductor structure covering the second current-carrying line. The first shielding conductor structure is connected to the second shielding conductor structure.

[0009] The detection and protection device is used to disconnect the power connection between the input and output terminals of the power line when it receives any one of the following: a leakage signal detected by the first shielding conductor structure, a leakage signal detected by the second shielding conductor structure, or an open circuit signal generated when the first or second shielding conductor structure is open.

[0010] The detection and protection device includes a trip coil for generating electromagnetic force to disconnect the power connection and a first varistor for absorbing surge voltage; the circuit board is provided with a support frame for fixing the trip coil, the support frame is provided with a first mounting part for mounting the first varistor, the first mounting part is provided with a first mounting hole and a second mounting hole for the two pins of the first varistor to pass through respectively, and an isolation part for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

[0011] According to the embodiments of this application, the varistor mounting structure for electrical connection devices includes a circuit board carrying a detection and protection device. A support frame is used to fix the trip coil, and a first mounting part is provided on the support frame to assist in mounting the first varistor, which is used to absorb surge voltage, onto the circuit board. A first mounting hole and a second mounting hole are provided on the support frame for the two pins of the first varistor to pass through, meaning the first varistor can be mounted onto the support frame first. The support frame is used to position the first varistor and the circuit board, preventing the first varistor from being too small and easily loosening or shifting when soldering the pins. An isolation part is also provided between the first mounting hole and the second mounting hole to increase the creepage distance between the two pins of the first varistor. This varistor mounting structure can accurately and conveniently mount the varistor on the circuit board and increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0012] According to some embodiments of this application, the varistor mounting structure is provided on the circuit board, with a first pad and a second pad respectively for soldering the two pins of the first varistor. When the support frame is mounted on the circuit board, the first mounting hole corresponds to the first pad and the second mounting hole corresponds to the second pad.

[0013] According to some embodiments of the present application, the varistor mounting structure includes a first stop near the first mounting hole and a second stop near the second mounting hole.

[0014] According to some embodiments of this application, the varistor mounting structure includes a first stop and a second stop that extend in a direction away from the circuit board.

[0015] According to some embodiments of the present application, a concave region is formed between the first stop and the second stop in the varistor mounting structure.

[0016] According to some embodiments of the present application, the varistor mounting structure is provided in which the first stop is arc-shaped and is disposed around the edge of the first mounting hole near the second mounting hole; the second stop is arc-shaped and is disposed around the edge of the second mounting hole near the first mounting hole.

[0017] According to some embodiments of the present application, the varistor mounting structure is made of insulating material, and the first stop and the second stop are integrally formed on the support frame.

[0018] Secondly, embodiments of this application provide an electrical connection device, including the varistor mounting structure described in any of the embodiments of the first aspect above.

[0019] According to the electrical connection device provided in the embodiments of this application, the detection and protection device further includes a self-test current injection module, a manual detection module, a fault response module, and a trigger module; the self-test current injection module is used to inject a self-test current into the first shielded conductor structure or the second shielded conductor structure; the manual detection module is used to inject a simulated leakage current into the first shielded conductor structure or the second shielded conductor structure; the fault response module is used to output a trip trigger signal when any one of the following is obtained: a leakage signal detected by the first shielded conductor structure, a leakage signal detected by the second shielded conductor structure, an open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open, or the simulated leakage current injected by the manual detection module is received; the trigger module is used to disconnect the power connection between the input end and the output end of the power line according to the received trip trigger signal, and the trigger module includes the trip coil.

[0020] Thirdly, embodiments of this application provide a varistor mounting structure, wherein a first varistor is mounted on a circuit board, a support frame is provided on the circuit board, a first mounting part is provided on the support frame for mounting the first varistor, the first mounting part is provided with a first mounting hole and a second mounting hole for the two pins of the first varistor to pass through respectively, and an isolation part for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

[0021] According to the embodiments of this application, the varistor mounting structure provides a support frame on the circuit board, and a first mounting part is provided on the support frame to assist in mounting the first varistor used to absorb surge voltage onto the circuit board. A first mounting hole and a second mounting hole are provided on the support frame for the two pins of the first varistor to pass through, meaning the first varistor can be mounted onto the support frame first. The support frame then positions the first varistor relative to the circuit board, preventing the small size of the first varistor from causing loosening or displacement of the pins during soldering. An isolation part is also provided between the first mounting hole and the second mounting hole to increase the creepage distance between the two pins of the first varistor. This varistor mounting structure can accurately and conveniently mount the varistor on the circuit board and increase the creepage distance between the two pins of the varistor, improving the safety of the circuit board.

[0022] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0023] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0024] The embodiments of this application will be further described below with reference to the accompanying drawings and examples;

[0025] Figure 1 is a schematic diagram of the overall structure of the electrical connection device provided in an embodiment of this application;

[0026] Figure 2 is a schematic diagram of the varistor mounting structure of the electrical connection device provided in an embodiment of this application;

[0027] Figure 3 is a front view of the varistor mounting structure of the electrical connection device provided in an embodiment of this application;

[0028] Figure 4 is a top view of the varistor mounting structure of the electrical connection device provided in an embodiment of this application;

[0029] Figure 5 is a circuit diagram of the power cord, self-test current injection module, and manual test module of the detection and protection device for electrical connection equipment provided in an embodiment of this application.

[0030] Figure 6 is a circuit diagram of the fault response module of the detection and protection device for electrical connection equipment provided in an embodiment of this application;

[0031] Figure 7 is a circuit diagram of the trigger module, indicator module and other components of the detection and protection device for electrical connection equipment provided in an embodiment of this application. Detailed Implementation

[0032] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0033] In the description of the embodiments of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. "At least one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0034] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this application in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0035] It should be noted that the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0036] A varistor is a voltage-sensitive, non-linear overvoltage protection semiconductor component. Utilizing its non-linear characteristics, when an overvoltage occurs between its terminals, the varistor clamps the voltage to a relatively fixed value, thus protecting downstream circuitry. Most electrical equipment circuit boards contain varistors, and sufficient creepage distance is required between the two leads to ensure safety. However, current circuit board designs prioritize miniaturization, neglecting the varistor's installation, resulting in insufficient creepage distance between the leads and significant safety hazards.

[0037] Based on this, embodiments of this application provide a varistor mounting structure and electrical connection device, which can accurately and conveniently mount the varistor on the circuit board, and increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0038] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0039] Figure 1 is a schematic diagram of the overall structure of the electrical connection device provided in the embodiment of this application. Referring to Figure 1, the electrical connection device includes a power cord 100 and a housing 500. A circuit board is provided inside the housing 500, and a detection and protection device electrically connected to the power cord 100 is provided on the circuit board.

[0040] Referring to Figure 5, the power line 100 includes a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor structure 130 covering the first current-carrying line 110, and a second shielding conductor structure 140 covering the second current-carrying line 120. The first shielding conductor structure 130 and the second shielding conductor structure 140 are connected.

[0041] The detection and protection device is used to disconnect the power connection between the input and output terminals of the power supply line 100 when any one of the following is detected: a leakage signal detected by the first shielded conductor structure 130, a leakage signal detected by the second shielded conductor structure 140, or an open-circuit signal generated when the first shielded conductor structure 130 or the second shielded conductor structure 140 is open. Specifically, referring to FIG5, the detection and protection device includes a self-test current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240. The self-test current injection module 210 is used to inject a self-test current into the first shielded conductor structure 130 or the second shielded conductor structure 140; the manual detection module 220 is used to inject a self-test current into the first shielded conductor structure 130 or the second shielded conductor structure 140. The fault response module 230 is used to output a trip trigger signal when it receives any one of the following: a leakage signal detected by the first shielding conductor structure 130, a leakage signal detected by the second shielding conductor structure 140, an open circuit signal generated when the first shielding conductor structure 130 or the second shielding conductor structure 140 is open, or a simulated leakage current injected by the manual detection module 220. The trigger module 240 is used to disconnect the power connection between the input and output terminals of the power line 100 according to the received trip trigger signal. The trigger module 240 includes a trip coil Lx for generating electromagnetic force to disconnect the power connection between the input and output terminals of the power line 100.

[0042] Additionally, referring to Figure 7, the detection and protection device also includes a first varistor ZR1 for absorbing surge voltage. It should be noted that the first varistor ZR1 can be used as a lightning protection module of the detection and protection device. The two ends of the first varistor ZR1 are connected to the first current-carrying line 110 and the second current-carrying line 120, respectively. It is understood that a varistor is a resistor with non-linear volt-ampere characteristics, mainly used for voltage clamping when a circuit is subjected to overvoltage, absorbing excess current to protect sensitive components. Therefore, placing the first varistor ZR1 between the first current-carrying line 110 and the second current-carrying line 120 can protect subsequent components in the detection and protection device from damage caused by lightning voltage.

[0043] Referring to FIG2, a first aspect embodiment of this application provides a varistor mounting structure for an electrical connection device. A support frame 400 for fixing a trip coil Lx is provided on a circuit board 300. A first mounting portion 410 for mounting a first varistor ZR1 is provided on the support frame 400. The first mounting portion 410 is provided with a first mounting hole 411 and a second mounting hole 412 through which the two pins of the first varistor ZR1 pass, respectively. An isolation portion 413 for increasing the creepage distance is provided between the first mounting hole 411 and the second mounting hole 412.

[0044] According to the embodiment of this application, the varistor mounting structure for an electrical connection device includes a circuit board 300 carrying a detection and protection device. A support frame 400 is provided to fix the trip coil Lx. A first mounting portion 410 is provided on the support frame 400 to assist in mounting a first varistor ZR1, used for absorbing surge voltage, onto the circuit board 300. A first mounting hole 411 and a second mounting hole 412 are provided on the support frame 400 to allow the two leads of the first varistor ZR1 to pass through, meaning the first varistor ZR1 can be mounted first. The first varistor ZR1 is positioned on the support frame 400 to prevent it from becoming loose or shifting during soldering due to its small size. An isolation part 413 is also provided between the first mounting hole 411 and the second mounting hole 412 to increase the creepage distance between the two pins of the first varistor ZR1. This varistor mounting structure can accurately and conveniently install the varistor on the circuit board and increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0045] Referring to FIG2, in the varistor mounting structure provided in some embodiments of this application, the circuit board 300 is provided with a first pad 310 and a second pad 320 for soldering the two pins of the first varistor ZR1 respectively. When the support frame 400 is mounted on the circuit board 300, the first mounting hole 411 corresponds to the first pad 310 and the second mounting hole 412 corresponds to the second pad 320.

[0046] Since the support frame 400 itself needs to fix the trip coil Lx, and the trip coil Lx needs to be electrically connected to the circuit board 300, that is, the support frame 400 and the circuit board 300 need to be fixedly connected together, in this embodiment, by setting the position of the first mounting hole 411 on the support frame 400 to correspond to the position of the first pad 310 on the circuit board 300, and setting the position of the second mounting hole 412 on the support frame 400 to correspond to the position of the second pad 320 on the circuit board 300, it is possible to achieve that after the support frame 400 is fixed to the circuit board 300, the two pins of the first varistor ZR1 are directly aligned with the first pad 310 and the second pad 320 respectively, thereby facilitating the pin soldering of the first varistor ZR1. Moreover, with the auxiliary positioning effect of the support frame 400, the first varistor ZR1 is not easy to shift during the soldering process, which is beneficial to improving the reliability and efficiency of the pin soldering of the first varistor ZR1.

[0047] Referring to Figures 2 to 4, in the varistor mounting structure provided in some embodiments of this application, the isolation portion 413 includes a first stop 4131 near the first mounting hole 411 and a second stop 4132 near the second mounting hole 412.

[0048] In this embodiment, by setting two blocks respectively to form an isolation part 413, the creepage distance between the first mounting hole 411 and the second mounting hole 412 needs to bypass the first block 4131 and the second block 4132 respectively, thereby greatly improving the creepage distance between the two pins of the first varistor ZR1 and improving the safety of the circuit board.

[0049] Referring to Figures 2 and 3, in the varistor mounting structure provided in some embodiments of this application, the first stop 4131 and the second stop 4132 extend in a direction away from the circuit board 300, that is, in the height direction of the angle shown in Figure 2.

[0050] In this embodiment, both the first block 4131 and the second block 4132 extend in a direction away from the circuit board 300. That is, the first block 4131 and the second block 4132 have a certain height, which avoids the inability to effectively isolate the pins when the exposed conductive metal of the two pins of the first varistor ZR1 is long, thus improving the isolation reliability of the isolation part 413.

[0051] Referring to FIG2, in the varistor mounting structure provided in some embodiments of this application, a concave region 414 is formed between the first stop 4131 and the second stop 4132.

[0052] In this embodiment, the presence of the recessed region 414 requires the creepage distance between the first mounting hole 411 and the second mounting hole 412 to bypass the surface of the recessed region 414, thereby effectively increasing the creepage distance and improving the safety of the circuit board.

[0053] Referring to FIG2, in the varistor mounting structure provided in some embodiments of this application, the first stop 4131 is arc-shaped and is disposed around the edge of the first mounting hole 411 near the edge of the second mounting hole 412; the second stop 4132 is arc-shaped and is disposed around the edge of the second mounting hole 412 near the edge of the first mounting hole 411.

[0054] In this embodiment, the first stop 4131 and the second stop 4132 are both arc-shaped and are respectively arranged around the edges of the first mounting hole 411 and the second mounting hole 412, which can effectively isolate the first mounting hole 411 and the second mounting hole 412.

[0055] Referring to FIG2, in the varistor mounting structure provided in some embodiments of this application, the support frame 400 is made of insulating material, and the first stop 4131 and the second stop 4132 are integrally formed on the support frame 400.

[0056] In this embodiment, the first stop 4131 and the second stop 4132 are integrally formed on the support frame 400. Compared with the structure of forming them separately and then assembling them together, the rigidity of the first stop 4131 and the second stop 4132 can be improved, and the first stop 4131 and the second stop 4132 can be prevented from easily deforming and falling off due to long-term pressure from the pin of the first varistor ZR1, thus avoiding potential hazards.

[0057] Furthermore, a second aspect of this application provides an electrical connection device, including the varistor mounting structure of any of the first aspects of the embodiments described above. Specifically, referring to FIG1, the electrical connection device includes a power cord 100 and a housing 500. A circuit board is disposed inside the housing 500, and a detection and protection device electrically connected to the power cord 100 is disposed on the circuit board. Referring to FIG5, the power cord 100 includes a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor structure 130 covering the first current-carrying line 110, and a second shielding conductor structure 140 covering the second current-carrying line 120. The first shielding conductor structure 130 is used to collect the leakage current signal of the first current-carrying line 110, and the second shielding conductor structure 140 is used to collect the leakage current signal of the second current-carrying line 120. It is understandable that when power line 100 supplies power to electrical equipment using two-phase AC power, it can be one of the following two cases: the first current-carrying line 110 is the live wire L, and the second current-carrying line 120 is the neutral wire N; or the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L. When power line 100 supplies power to electrical equipment using three-phase AC power, it can be one of the following three cases: the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L1; or the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the live wire L2. The following explanation uses the case shown in Figure 5, where the first current-carrying line 110 is the live wire L and the second current-carrying line 120 is the neutral wire N, as an example. The other cases can be understood similarly. Furthermore, the first shielding conductor structure 130 is connected to the second shielding conductor structure 140. Specifically, the first shielding conductor structure 130 includes a first end a near the input terminal of the power line 100 and a second end b near the output terminal of the power line 100; the second shielding conductor structure 140 includes a third end c near the input terminal of the power line 100 and a fourth end d near the output terminal of the power line 100; the second end b and the fourth end d are connected. It can be understood that the connection between the second end b of the first shielding conductor structure 130 near the output terminal of the power line 100 and the fourth end d of the second shielding conductor structure 140 near the output terminal of the power line 100 forms a series detection loop. The integrity of the first shielding conductor structure 130 and the second shielding conductor structure 140 can be detected by determining whether current can flow through this series detection loop.

[0058] Referring to Figure 5, in the electrical connection device provided in the embodiments of this application, the detection and protection device includes a self-test current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240. The self-test current injection module 210 is used to inject a self-test current into the first shielded conductor structure 130 or the second shielded conductor structure 140. The manual detection module 220 is used to inject a simulated leakage current into the first shielded conductor structure 130 or the second shielded conductor structure 140. The fault response module 230 is used to output a trip trigger signal when any one of the following is obtained: a leakage signal detected by the first shielded conductor structure 130, a leakage signal detected by the second shielded conductor structure 140, an open circuit signal generated when the first shielded conductor structure 130 or the second shielded conductor structure 140 is open, or a simulated leakage current injected by the manual detection module 220. The trigger module 240 is used to disconnect the power connection between the input and output terminals of the power line 100 according to the received trip trigger signal. The trigger module 240 includes a trip coil Lx.

[0059] Specifically, referring to Figure 5, the manual detection module 220 includes a test switch TEST and a first resistor R1. One end of the test switch TEST is connected to the first current-carrying line 110, and the other end of the test switch TEST is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to the first terminal a of the first shielding conductor structure 130. The self-test current injection module 210 includes a second resistor R2. One end of the second resistor R2 is connected to the first current-carrying line 110, and the other end of the second resistor R2 is connected to the third terminal c of the second shielding conductor structure 140. During manual detection, pressing the test switch TEST closes the switch, generating a simulated leakage current under the voltage provided by the first current-carrying line 110. This current flows sequentially through the test switch TEST, the first resistor R1, the first shielding conductor structure 130, and the second shielding conductor structure 140, finally flowing from the third terminal c of the second shielding conductor structure 140 to the fault response module 230. Alternatively, current can flow directly from the connection point between the first resistor R1 and the first shielding conductor structure 130, i.e., the first terminal a, to the fault response module 230. The first current-carrying line 110 and the third end c of the second shielding conductor structure 140 are respectively connected to the two ends of the second resistor R2, so that a self-test current is generated under the action of the voltage provided by the first current-carrying line 110, and flows through the second resistor R2, the second shielding conductor structure 140, and the first shielding conductor structure 130 in sequence, and finally flows from the first end a of the first shielding conductor structure 130 to the fault response module 230; or there may be a current that flows directly from the connection point between the second resistor R2 and the second shielding conductor structure 140, that is, the third end c, to the fault response module 230. When the first shielding conductor structure 130 is open, the second shielding conductor structure 140 is open, or the connection line between the second terminal b and the fourth terminal d is open, the self-test current cannot flow from the third terminal c of the second shielding conductor structure 140 into the second shielding conductor structure 140, but can only flow to the fault response module 230, thereby generating an open-circuit signal flowing from the third terminal c to the fault response module 230, causing the fault response module 230 to output a trip trigger signal, which in turn drives the trip coil Lx to disconnect the power connection between the input and output terminals of the power line 100 by the trigger module 240.

[0060] Referring further to Figure 6, the fault response module 230 includes a fourth resistor R4, a first capacitor C1, and a Zener diode ZD1. One end of the fourth resistor R4, one end of the first capacitor C1, and one end of the Zener diode ZD1 are connected together. The other end of the fourth resistor R4 is connected to the third terminal c of the second shielded conductor structure 140. The other ends of the first capacitor C1 and the Zener diode ZD1 are both connected to the trigger module 240. The detection and protection device also includes a third resistor R3. One end of the third resistor R3 is connected to the first terminal a of the first shielded conductor structure 130, and the other end of the third resistor R3 is connected to the fault response module 230 and the trigger module 240. When the following four conditions occur, the Zener diode ZD1 will break down in reverse, thereby outputting a trip trigger signal to the trigger module 240: The first condition is that the first shielded conductor... The first case is that the body structure 130 detects a leakage signal from the first current-carrying line 110 and transmits it to the fault response module 230; the second case is that the second shielding conductor structure 140 detects a leakage signal from the second current-carrying line 120 and transmits it to the fault response module 230; the third case is that the first shielding conductor structure 130 is open, the second shielding conductor structure 140 is open, or the connection line between the second terminal b and the fourth terminal d is open, generating an open-circuit signal flowing from the third terminal c to the fault response module 230; the fourth case is that the test switch TEST is pressed manually, generating a simulated leakage current, which flows from the third terminal c of the second shielding conductor structure 140 to the fault response module 230; the connection point of the third resistor R3 and the first capacitor C1 is also connected to the trigger module 240 so that a complete current loop can be formed.

[0061] Referring further to Figure 7, the detection and protection device also includes a first diode D1. The anode of the first diode D1 is connected to the trigger module 240, and the cathode of the first diode D1 is connected to the first current-carrying line 110. The trigger module 240 includes a fifth resistor R5, a second capacitor C2, and a silicon controlled rectifier (SCR) Q1. One end of the fifth resistor R5, one end of the second capacitor C2, and the cathode of the SCR Q1 are all connected to the anode of the first diode D1. The other end of the fifth resistor R5, the other end of the second capacitor C2, and the control pin of the SCR Q1 are connected together and connected to the fault response module 230. The anode of the SCR Q1 is directly or indirectly connected to the second current-carrying line 120. Specifically, one end of the trip coil Lx is connected to the second current-carrying line 120, and the other end of the trip coil Lx is connected to the anode of the thyristor Q1; the detection and protection device also includes a second varistor ZR2 and a second diode D2, both of which are connected in parallel with the thyristor Q1; the detection and protection device also includes an indicator module 250, which includes a sixth resistor R6 and a light-emitting diode LED1, one end of the sixth resistor R6 is connected to the trip coil Lx, the other end of the sixth resistor R6 is connected to the positive terminal of the light-emitting diode LED1, and the negative terminal of the light-emitting diode LED1 is connected to the positive terminal of the first diode D1. When the output terminal of the fault response module 230 outputs a trip trigger signal to the control electrode of the thyristor Q1, the trip trigger signal charges the second capacitor C2 through the fifth resistor R5, and the potential of the control electrode of the thyristor Q1 rises. When the negative half-cycle of the AC power supply arrives, that is, when the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q1 is turned on, forming a strong current path of the second current-carrying line 120-trip coil Lx-thyristor Q1-first diode D1-first current-carrying line 110. The trip coil Lx generates a strong electromagnetic force, thereby disconnecting the power connection between the input and output terminals of the power line. The first diode D1 and the second diode D2 ensure that the current signal transmitted to the cathode of the thyristor Q1 can form a complete current loop and flow back to the first current-carrying line 110 or the second current-carrying line 120.

[0062] Additionally, referring to FIG2, a third aspect embodiment of this application provides a varistor mounting structure, wherein a first varistor ZR1 is mounted on a circuit board 300, a support frame 400 is provided on the circuit board 300, and a first mounting portion 410 for mounting the first varistor ZR1 is provided on the support frame 400. The first mounting portion 410 is provided with a first mounting hole 411 and a second mounting hole 412 through which the two pins of the first varistor ZR1 pass, respectively. An isolation portion 413 for increasing the creepage distance is provided between the first mounting hole 411 and the second mounting hole 412.

[0063] The varistor mounting structure provided in the embodiments of this application assists in mounting a first varistor ZR1, used for absorbing surge voltage, onto the circuit board 300 by providing a support frame 400 and a first mounting part 410 on the support frame 400. A first mounting hole 411 and a second mounting hole 412 are provided on the support frame 400 for the two pins of the first varistor ZR1 to pass through, allowing the first varistor ZR1 to be mounted onto the support frame 400 first. The support frame 400 positions the first varistor ZR1 relative to the circuit board 300, preventing the small size of the first varistor ZR1 from easily loosening or shifting during soldering. An isolation part 413 is also provided between the first mounting hole 411 and the second mounting hole 412, increasing the creepage distance between the two pins of the first varistor ZR1. This varistor mounting structure not only allows for accurate and convenient mounting of the varistor on the circuit board but also increases the creepage distance between the two pins of the varistor, improving the safety of the circuit board.

[0064] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0065] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A varistor mounting structure for an electrical connection device, wherein, The electrical connection device includes a power cord and a detection and protection device disposed on the circuit board and electrically connected to the power cord. The power line includes a first current-carrying line, a second current-carrying line, a first shielding conductor structure covering the first current-carrying line, and a second shielding conductor structure covering the second current-carrying line, wherein the first shielding conductor structure is connected to the second shielding conductor structure. The detection and protection device is used to disconnect the power connection between the input and output terminals of the power line when any one of the following is detected: a leakage signal detected by the first shielding conductor structure, a leakage signal detected by the second shielding conductor structure, or an open-circuit signal generated when either the first or second shielding conductor structure is open; and The detection and protection device includes a trip coil for generating electromagnetic force to disconnect the power connection and a first varistor for absorbing surge voltage; the circuit board is provided with a support frame for fixing the trip coil, the support frame is provided with a first mounting part for mounting the first varistor, the first mounting part is provided with a first mounting hole and a second mounting hole for the two pins of the first varistor to pass through respectively, and an isolation part for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

2. The varistor mounting structure according to claim 1, wherein, The circuit board is provided with a first pad and a second pad for soldering the two pins of the first varistor. When the support frame is installed on the circuit board, the first mounting hole corresponds to the first pad and the second mounting hole corresponds to the second pad.

3. The varistor mounting structure according to claim 1 or 2, wherein, The isolation section includes a first stop near the first mounting hole and a second stop near the second mounting hole.

4. The varistor mounting structure according to claim 3, wherein, The first stop and the second stop extend in a direction away from the circuit board.

5. The varistor mounting structure according to claim 3 or 4, wherein, A concave region is formed between the first stop block and the second stop block.

6. The varistor mounting structure according to any one of claims 3 to 5, wherein, The first stop is arc-shaped and is disposed around the edge of the first mounting hole near the second mounting hole; the second stop is arc-shaped and is disposed around the edge of the second mounting hole near the first mounting hole.

7. The varistor mounting structure according to any one of claims 3 to 6, wherein, The support frame is made of insulating material, and the first stop and the second stop are integrally formed on the support frame.

8. An electrical connection device comprising the varistor mounting structure as described in any one of claims 1 to 7.

9. The electrical connection device according to claim 8, wherein, The detection and protection device further includes a self-test current injection module, a manual detection module, a fault response module, and a trigger module; the self-test current injection module is used to inject a self-test current into the first shielded conductor structure or the second shielded conductor structure; the manual detection module is used to inject a simulated leakage current into the first shielded conductor structure or the second shielded conductor structure; the fault response module is used to output a trip trigger signal when any one of the following is obtained: a leakage signal detected by the first shielded conductor structure, a leakage signal detected by the second shielded conductor structure, an open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open, or the simulated leakage current injected by the manual detection module is received; the trigger module is used to disconnect the power connection between the input and output terminals of the power line according to the received trip trigger signal, and the trigger module includes the trip coil.

10. A varistor mounting structure, comprising a first varistor and a circuit board, wherein the first varistor is mounted on the circuit board, a support frame is provided on the circuit board, the support frame is provided with a first mounting portion for mounting the first varistor, the first mounting portion is provided with a first mounting hole and a second mounting hole for two pins of the first varistor to pass through respectively, and an isolation portion for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

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