Piezoresistor mounting structure and electric connection equipment

Abstract

The utility model discloses a piezoresistor installation structure and an electric connection device. The electric connection device comprises a power line and a detection protection device which is arranged on a circuit board and is electrically connected with the power line. The detection protection device comprises a trip coil used for generating electromagnetic force to break the power connection and a first piezoresistor used for absorbing surge voltage. The circuit board is provided with a support frame used for fixing the trip coil, the support frame is provided with a first installation part used for installing the first piezoresistor, and the first installation part is provided with a first installation hole and a second installation hole which are respectively used for two pins of the first piezoresistor to pass through. An isolation part used for increasing the creepage distance is arranged between the first mounting hole and the second mounting hole. The piezoresistor can be accurately and conveniently installed on the circuit board, the creepage distance between the two pins of the piezoresistor can be increased, and the safety of the circuit board is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a varistor installation structure and an electrical connection device. Background Art

[0002] A varistor is a voltage-sensitive, nonlinear overvoltage protection semiconductor component. By utilizing the nonlinear characteristics of a varistor, when an overvoltage occurs between its two electrodes, the varistor can clamp the voltage to a relatively fixed value, thereby protecting subsequent circuits.

[0003] Most electrical devices have varistors installed on their circuit boards. Sufficient creepage distance is required between the two pins of a varistor to ensure safety. However, most circuit boards are currently pursuing miniaturization, while neglecting the installation of varistors. This results in a small creepage distance between the two pins of the varistor, posing a significant safety hazard. Utility Model Content

[0004] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art and to provide a varistor mounting structure and an electrical connection device, which can not only accurately and conveniently install the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0005] In a first aspect, an embodiment of the present invention provides a varistor mounting structure for an electrical connection device, the electrical connection device comprising a power line, a detection and protection device disposed on a circuit board and electrically connected to the power line;

[0006] 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;

[0007] The detection and protection device is configured to disconnect the power connection between the input end and the output end of the power line when any one of the leakage signal detected by the first shielded conductor structure, the leakage signal detected by the second shielded conductor structure, and the open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open circuit is obtained;

[0008] 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; a support frame for fixing the trip coil is provided on the circuit board, and a first mounting portion for mounting the first varistor is provided on the support frame, and the first mounting portion is provided with a first mounting hole and a second mounting hole for respectively passing two pins of the first varistor through, and an isolation portion for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

[0009] The varistor mounting structure of the electrical connection device provided by the embodiment of the utility model has at least the following beneficial effects: a circuit board carrying a detection and protection device fixes a tripping coil by setting a support frame, and a first mounting portion is provided on the support frame to assist in installing the first varistor for absorbing surge voltage on the circuit board, and 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, that is, the first varistor can be installed on the support frame first, and the positioning of the first varistor and the circuit board is achieved by the support frame to avoid the first varistor being too small and causing the pins to be easily loosened and shifted during welding, and an isolation portion is provided between the first mounting hole and the second mounting hole to increase the creepage distance between the two pins of the first varistor. The varistor mounting structure can not only accurately and conveniently install the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0010] According to the varistor mounting structure provided in some embodiments of the present invention, a first soldering pad and a second soldering pad are provided on the circuit board for soldering two pins of the first varistor respectively. When the support frame is installed on the circuit board, the first mounting hole corresponds to the first soldering pad, and the second mounting hole corresponds to the second soldering pad.

[0011] According to the varistor mounting structure provided by some embodiments of the present invention, the isolation portion includes a first stopper close to the first mounting hole and a second stopper close to the second mounting hole.

[0012] According to the varistor mounting structure provided by some embodiments of the present invention, the first stopper and the second stopper extend in a direction away from the circuit board.

[0013] According to the varistor installation structure provided by some embodiments of the present invention, a concave area is formed between the first stopper and the second stopper.

[0014] According to the varistor mounting structure provided in some embodiments of the present invention, the first stopper is arc-shaped and is arranged around the edge of the first mounting hole close to the second mounting hole; the second stopper is arc-shaped and is arranged around the edge of the second mounting hole close to the first mounting hole.

[0015] According to the varistor installation structure provided by some embodiments of the present invention, the support frame is made of insulating material, and the first stopper and the second stopper are integrally formed on the support frame.

[0016] In a second aspect, an embodiment of the present invention provides an electrical connection device, comprising a varistor mounting structure as described in any one of the embodiments of the first aspect above.

[0017] According to the electrical connection device provided by an embodiment of the present utility model, the detection and protection device also includes a self-detection current injection module, a manual detection module, a fault response module and a trigger module; the self-detection current injection module is used to inject a self-detection 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 tripping trigger signal when obtaining any one of the leakage signal detected by the first shielded conductor structure, the leakage signal detected by the second shielded conductor structure, the open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open circuit, and the simulated leakage current injected by the manual detection module; the trigger module is used to disconnect the power connection between the input end and the output end of the power cord according to the received tripping trigger signal, and the trigger module includes the tripping coil.

[0018] In the third aspect, an embodiment of the utility model provides 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 portion for mounting the first varistor is provided on the support frame, the first mounting portion is provided with a first mounting hole and a second mounting hole for respectively passing two pins of the first varistor, and an isolation portion for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

[0019] The varistor mounting structure provided by the embodiment of the present utility model has at least the following beneficial effects: a support frame is provided on the circuit board, and a first mounting portion is provided on the support frame to assist in mounting the first varistor for absorbing surge voltage on the circuit board; a first mounting hole and a second mounting hole are provided on the support frame to allow the two pins of the first varistor to pass through, that is, the first varistor can be mounted on the support frame first, and the positioning of the first varistor and the circuit board can be achieved through the support frame to avoid the first varistor being small and causing the pins to be easily loosened and shifted during welding; an isolation portion 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; the varistor mounting structure can not only accurately and conveniently mount the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0020] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a schematic diagram of the overall structure of the electrical connection device provided by an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of a varistor installation structure of an electrical connection device provided by an embodiment of the present utility model;

[0025] Figure 3 This is a front view schematic diagram of a varistor mounting structure of an electrical connection device provided by an embodiment of the present utility model;

[0026] Figure 4 This is a top view of a varistor mounting structure of an electrical connection device provided by an embodiment of the present utility model;

[0027] Figure 5 This is a circuit schematic diagram of a power line, a self-test current injection module, and a manual test module of a detection and protection device for an electrical connection device provided by an embodiment of the present utility model;

[0028] Figure 6 This is a circuit schematic diagram of a fault response module of a detection and protection device for an electrical connection device provided by an embodiment of the present utility model;

[0029] Figure 7 This is a circuit schematic diagram of a trigger module, an indication module and other components of a detection and protection device for an electrical connection device provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. "At least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If "first," "second," or the like is used in the description, it is only for the purpose of distinguishing technical features and is not to be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] It should be noted that the terms "set," "install," and "connect" in the embodiments of the present invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of the present invention based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0033] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] A varistor is a voltage-sensitive, nonlinear semiconductor component that provides overvoltage protection. Utilizing the varistor's nonlinear characteristics, when an overvoltage occurs between its two electrodes, the varistor clamps the voltage to a relatively fixed value, thereby protecting subsequent circuits. Most electrical devices have varistors installed on their circuit boards. Sufficient creepage distance is required between the two pins of the varistor to ensure safety. However, most current circuit boards pursue miniaturization while ignoring the installation of varistors. This results in a small creepage distance between the two pins of the varistor, posing a significant safety hazard.

[0035] Based on this, the embodiment of the utility model provides a varistor installation structure and an electrical connection device, which can not only accurately and conveniently install the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0036] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings.

[0037] Figure 1 The overall structural diagram of the electrical connection device provided by the embodiment of the present utility model is shown in FIG. 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 protection device electrically connected to the power cord 100 is provided on the circuit board;

[0038] Among them, reference 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, wherein the first shielding conductor structure 130 is connected to the second shielding conductor structure 140;

[0039] The detection protection device is used to disconnect the power connection between the input end and the output end of the power line 100 when any one of the leakage signal detected by the first shielding conductor structure 130, the leakage signal detected by the second shielding conductor structure 140, and the open circuit signal generated when the first shielding conductor structure 130 or the second shielding conductor structure 140 is open is obtained; specifically, referring to Figure 5The detection and protection device includes a self-detection current injection module 210, a manual detection module 220, a fault response module 230 and a trigger module 240; the self-detection current injection module 210 is used to inject a self-detection 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 tripping trigger signal when any one of the leakage signal detected by the first shielded conductor structure 130, the leakage signal detected by the second shielded conductor structure 140, the open circuit signal generated when the first shielded conductor structure 130 or the second shielded conductor structure 140 is open circuited, and the simulated leakage current injected by the manual detection module 220 is obtained; the trigger module 240 is used to disconnect the power connection between the input end and the output end of the power cord 100 according to the received tripping trigger signal, and the trigger module 240 includes a tripping coil Lx for generating an electromagnetic force to disconnect the power connection between the input end and the output end of the power cord 100.

[0040] In addition, refer 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 for the detection and protection device, and the two ends of the first varistor ZR1 are respectively connected to the first current-carrying line 110 and the second current-carrying line 120. It can be understood that a varistor is a resistor device with a nonlinear volt-ampere characteristic, which is mainly used to clamp the voltage when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. Therefore, the first varistor ZR1 is provided between the first current-carrying line 110 and the second current-carrying line 120 to protect subsequent components in the detection and protection device from being easily damaged by lightning voltage.

[0041] Reference Figure 2 In a first aspect, an embodiment of the present invention 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 for respectively passing two pins of the first varistor ZR1. An isolation portion 413 for increasing a creepage distance is provided between the first mounting hole 411 and the second mounting hole 412.

[0042] According to the varistor mounting structure of the electrical connection device provided by the embodiment of the present invention, the circuit board 300 carrying the detection and protection device is fixed by setting a support frame 400 to fix the trip coil Lx. At the same time, a first mounting portion 410 is provided on the support frame 400 to assist in mounting the first varistor ZR1 for absorbing surge voltage on the circuit board 300. By setting a first mounting hole 411 and a second mounting hole 412 on the support frame 400, the two pins of the first varistor ZR1 can pass through, that is, the first varistor ZR1 can be installed first. The first varistor ZR1 is placed on the support frame 400, and the support frame 400 is used to position the first varistor ZR1 and the circuit board 300, so as to prevent the first varistor ZR1 from being loosened and shifted easily when the pins are soldered due to its small size. An isolation portion 413 is also provided between the first mounting hole 411 and the second mounting hole 412, so as to increase the creepage distance between the two pins of the first varistor ZR1. The varistor mounting structure can not only accurately and conveniently install the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0043] Reference Figure 2 In the varistor mounting structure provided in some embodiments of the present invention, a first soldering pad 310 and a second soldering pad 320 are provided on the circuit board 300 for soldering two pins of the first varistor ZR1 respectively. When the support frame 400 is installed on the circuit board 300, the first mounting hole 411 corresponds to the first soldering pad 310, and the second mounting hole 412 corresponds to the second soldering pad 320.

[0044] Since the support frame 400 itself needs to fix the tripping coil Lx, and the tripping 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 fixed 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 soldering 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 soldering 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 soldering pad 310 and the second soldering pad 320 respectively, so that the pin welding of the first varistor ZR1 can be conveniently achieved, and under the auxiliary positioning effect of the support frame 400, the first varistor ZR1 is not easy to shift during the welding process, which is beneficial to improving the reliability and efficiency of the pin welding of the first varistor ZR1.

[0045] Reference Figures 2 to 4 In the varistor mounting structure provided in some embodiments of the present invention, the isolation portion 413 includes a first stopper 4131 close to the first mounting hole 411 and a second stopper 4132 close to the second mounting hole 412 .

[0046] In this embodiment, two blocks are respectively provided to form an isolation portion 413, so that 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.

[0047] Reference Figure 2 and Figure 3 In the varistor mounting structure provided in some embodiments of the present invention, the first stopper 4131 and the second stopper 4132 extend in a direction away from the circuit board 300, that is, toward Figure 2 The angles shown extend in the height direction.

[0048] In this embodiment, the first stop 4131 and the second stop 4132 both extend in a direction away from the circuit board 300, that is, the first stop 4131 and the second stop 4132 have a certain height, which avoids the inability to effectively achieve isolation between the two pins of the first varistor ZR1 when the exposed conductive metal is too long, thereby improving the isolation reliability of the isolation part 413.

[0049] Reference Figure 2 In the varistor mounting structure provided in some embodiments of the present invention, a concave area 414 is formed between the first stopper 4131 and the second stopper 4132 .

[0050] In this embodiment, the presence of the concave area 414 requires the creepage distance between the first mounting hole 411 and the second mounting hole 412 to bypass the surface of the concave area 414, thereby effectively increasing the creepage distance and improving the safety of the circuit board.

[0051] Reference Figure 2 In the varistor mounting structure provided in some embodiments of the present invention, the first stopper 4131 is arc-shaped and is arranged around the edge of the first mounting hole 411 close to the second mounting hole 412; the second stopper 4132 is arc-shaped and is arranged around the edge of the second mounting hole 412 close to the first mounting hole 411.

[0052] In this embodiment, the first stopper 4131 and the second stopper 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 from the second mounting hole 412 .

[0053] Reference Figure 2 In the varistor installation structure provided in some embodiments of the present invention, the support frame 400 is made of insulating material, and the first stopper 4131 and the second stopper 4132 are integrally formed on the support frame 400.

[0054] In this embodiment, the first stop block 4131 and the second stop block 4132 are integrally formed on the support frame 400. Compared with a structure in which they are formed separately and then assembled together, the rigidity of the first stop block 4131 and the second stop block 4132 can be improved, thereby preventing the first stop block 4131 and the second stop block 4132 from being easily deformed and falling off due to being squeezed by the pins of the first varistor ZR1 for a long time, thereby causing hidden dangers.

[0055] In addition, the second embodiment of the present invention provides an electrical connection device, including the varistor installation structure of any one of the first embodiment. 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 protection device electrically connected to the power cord 100 is provided on the circuit board; Figure 5 The power cord 100 includes a first current-carrying wire 110, a second current-carrying wire 120, a first shielded conductor structure 130 covering the first current-carrying wire 110, and a second shielded conductor structure 140 covering the second current-carrying wire 120. The first shielded conductor structure 130 is used to collect leakage signals from the first current-carrying wire 110, and the second shielded conductor structure 140 is used to collect leakage signals from the second current-carrying wire 120. It is understood that when the power cord 100 supplies power to an electrical device using two-phase alternating current, one of the following two situations can be true: the first current-carrying wire 110 is the live wire L, and the second current-carrying wire 120 is the neutral wire N; or the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L. When the power line supplies power to an electrical device using three-phase AC power, it can be one of the following three situations: the first current-carrying line 110 is the live line L1, and the second current-carrying line 120 is the neutral line N; the first current-carrying line 110 is the neutral line N, and the second current-carrying line 120 is the live line L1; the first current-carrying line 110 is the live line L1, and the second current-carrying line 120 is the live line L2. Figure 5The illustrated case, where the first current-carrying line 110 is the live line L and the second current-carrying line 120 is the neutral line N, is used as an example for illustration; the same applies to other cases. Furthermore, the first shielded conductor structure 130 is connected to the second shielded conductor structure 140. Specifically, the first shielded conductor structure 130 includes a first end a near the input end of the power line 100 and a second end b near the output end of the power line 100. The second shielded conductor structure 140 includes a third end c near the input end of the power line 100 and a fourth end d near the output end of the power line 100. The second end b and the fourth end d are connected. It is understood that the second end b of the first shielded conductor structure 130 near the output end of the power line 100 is connected to the fourth end d of the second shielded conductor structure 140 near the output end of the power line 100, so that the first shielded conductor structure 130 and the second shielded conductor structure 140 form a series detection loop. The integrity of the first and second shielded conductor structures 130, 140 can be detected by determining whether current can flow through the series detection loop.

[0056] Reference Figure 5 In the electrical connection device provided in an embodiment of the present utility model, the detection and protection device includes a self-detection current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240; the self-detection current injection module 210 is used to inject a self-detection 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 circuited, or the simulated leakage current injected by the manual detection module 220; the trigger module 240 is used to disconnect the power connection between the input end and the output end of the power cord 100 according to the received trip trigger signal, and the trigger module 240 includes a trip coil Lx.

[0057] Specifically, refer 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, the other end of the test switch TEST is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the first end 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 end c of the second shielding conductor structure 140; when performing manual detection, the test switch TEST is pressed to close the test switch TEST, and a simulated leakage current is generated under the action of the voltage provided by the first current-carrying line 110, and flows through the test switch TEST, the first resistor R1, the first shielding conductor structure 130, and the second shielding conductor structure 140 in sequence, and finally flows from the third end c of the second shielding conductor structure 140 to the fault response module 230. In addition, there may also be a current flowing directly from the connection point between the first resistor R1 and the first shielding conductor structure 130, that is, the first end a, to the fault response module 230; due to the second voltage The two ends of the resistor R2 are respectively connected to the first current-carrying line 110 and the third end c of the second shielded conductor structure 140, 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 shielded conductor structure 140, the first shielded conductor structure 130 in sequence, and finally flows from the first end a of the first shielded conductor structure 130 to the fault response module 230; there may also be a current that flows directly from the connection point between the second resistor R2 and the second shielded conductor structure 140, that is, the third end c, to the fault response module 230; when the first If the first shielded conductor structure 130 is open, the second shielded conductor structure 140 is open, or the connection line between the second end b and the fourth end d is open, the self-test current cannot flow from the third end c of the second shielded conductor structure 140 into the second shielded conductor structure 140 and can only flow to the fault response module 230, thereby generating an open-circuit signal flowing from the third end c to the fault response module 230, causing the fault response module 230 to output a trip trigger signal, and then the trigger module 240 drives the trip coil Lx to disconnect the power connection between the input end and the output end of the power cord 100.

[0058] Further references 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 end c of the second shielded conductor structure 140, the other end of the first capacitor C1 and the other end of 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 end 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 situations occur, the Zener diode ZD1 will be reversely broken down, thereby outputting a tripping trigger signal to the trigger module 240: the first situation is that the first shielded conductor 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 shielded 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 shielded conductor structure 130 is open, the second shielded conductor structure 140 is open, or the connecting line between the second end b and the fourth end d is open, generating an open circuit signal flowing from the third end c to the fault response module 230; the fourth case is manual detection of pressing the test switch TEST, generating a simulated leakage current, and flowing from the third end c of the second shielded 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.

[0059] Further references Figure 7The detection and protection device further 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 thyristor Q1, one end of the fifth resistor R5, one end of the second capacitor C2 and the cathode of the thyristor 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 thyristor Q1 are connected together and connected to the fault response module 230, and the anode of the thyristor Q1 is directly or indirectly connected to the second current-carrying line 120; specifically One end of the tripping coil Lx is connected to the second current-carrying line 120, and the other end of the tripping 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, and the second varistor ZR2 and the second diode D2 are both connected in parallel with the thyristor Q1; the detection and protection device also includes an indication 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 tripping coil Lx, the other end of the sixth resistor R6 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to the anode 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, causing the potential of the control electrode of the thyristor Q1 to increase. When the AC power supply enters the negative half-cycle, that is, when the voltage level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q1 turns on, forming a strong current path from the second current-carrying line 120 to the trip coil Lx, the thyristor Q1, the first diode D1, and the 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, flowing back to the first current-carrying line 110 or the second current-carrying line 120.

[0060] In addition, refer to Figure 2 In a third aspect, an embodiment of the present invention 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 for respectively passing two pins of the first varistor ZR1 through. An isolation portion 413 for increasing a creepage distance is provided between the first mounting hole 411 and the second mounting hole 412.

[0061] The varistor mounting structure provided by the embodiment of the present invention assists in mounting the first varistor ZR1 for absorbing surge voltage on the circuit board 300 by arranging a support frame 400 on the circuit board 300 and providing a first mounting portion 410 on the support frame 400. The first mounting hole 411 and the second mounting hole 412 are provided on the support frame 400 for the two pins of the first varistor ZR1 to pass through. That is, the first varistor ZR1 can be mounted on the support frame 400 first, and the positioning of the first varistor ZR1 and the circuit board 300 is achieved by the support frame 400, so as to avoid the first varistor ZR1 being too small and causing the pins to be easily loosened and shifted during welding. An isolation portion 413 is also provided between the first mounting hole 411 and the second mounting hole 412, so as to increase the creepage distance between the two pins of the first varistor ZR1. The varistor mounting structure can not only accurately and conveniently mount the varistor on the circuit board, but also increase the creepage distance between the two pins of the varistor, thereby improving the safety of the circuit board.

[0062] 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 appropriate combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media or non-transitory media and communication media or transient media. As is well 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 technology, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A varistor mounting structure for an electrical connection device, characterized in that: The electrical connection device includes a power line, and a detection and protection device provided on a circuit board and electrically connected to the power line; 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 configured to disconnect the power connection between the input end and the output end of the power line when any one of the leakage signal detected by the first shielded conductor structure, the leakage signal detected by the second shielded conductor structure, and the open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open circuit is obtained; 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; a support frame for fixing the trip coil is provided on the circuit board, and a first mounting portion for mounting the first varistor is provided on the support frame, and the first mounting portion is provided with a first mounting hole and a second mounting hole for respectively passing two pins of the first varistor through, and an isolation portion 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 soldering pad and a second soldering pad for soldering two pins of the first varistor respectively. When the support frame is installed on the circuit board, the first mounting hole corresponds to the first soldering pad, and the second mounting hole corresponds to the second soldering pad.

3. The varistor mounting structure according to claim 1, wherein: The isolation portion includes a first stopper close to the first mounting hole and a second stopper close to the second mounting hole.

4. The varistor mounting structure according to claim 3, characterized in that: The first stopper and the second stopper extend in a direction away from the circuit board.

5. The varistor mounting structure according to claim 3, characterized in that: A concave area is formed between the first stopper and the second stopper.

6. The varistor mounting structure according to claim 3, characterized in that: The first stopper is in an arc shape and is arranged around the edge of the first mounting hole close to the second mounting hole; the second stopper is in an arc shape and is arranged around the edge of the second mounting hole close to the first mounting hole.

7. The varistor mounting structure according to claim 3, characterized in that: The support frame is made of insulating material, and the first stopper and the second stopper are integrally formed on the support frame.

8. An electrical connection device, characterized in that: The varistor mounting structure includes the varistor mounting structure according to any one of claims 1 to 7.

9. The electrical connection device according to claim 8, characterized in that The detection and protection device also includes a self-detection current injection module, a manual detection module, a fault response module and a trigger module; the self-detection current injection module is used to inject a self-detection 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 tripping trigger signal when obtaining any one of the leakage signal detected by the first shielded conductor structure, the leakage signal detected by the second shielded conductor structure, the open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open circuit, and the simulated leakage current injected by the manual detection module; the trigger module is used to disconnect the power connection between the input end and the output end of the power cord according to the received tripping trigger signal, and the trigger module includes the tripping coil.

10. A varistor mounting structure, characterized in that: The first varistor is mounted on a circuit board, and a support frame is provided on the circuit board. A first mounting portion for mounting the first varistor is provided on the support frame. The first mounting portion is provided with a first mounting hole and a second mounting hole for respectively passing two pins of the first varistor through. An isolation portion for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

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