Rapid wiring type surge protector

Abstract

The utility model discloses a rapid wiring type surge protector. The rapid wiring type surge protector comprises a housing, a circuit board, a first terminal assembly and a second terminal assembly. An accommodating space and a terminal groove are arranged in the shell, and the circuit board is arranged in the accommodating space; each terminal assembly comprises a terminal base, a conductive terminal, an elastic clamping piece and a button. The terminal seat is provided with a terminal accommodating space and a wiring hole, and the elastic clamping piece is abutted between the conductive terminal and the inner wall of the terminal seat. The button is installed on the terminal base in a pressing mode, the button is pressed to enable the upper end of the elastic clamping piece to be separated from the conductive terminal, and the elastic clamping piece clamps the wire rod when the button is loosened. The circuit board, the terminal assembly and the conductive terminal are integrated in the shell, and the button, the elastic clamping piece and the conductive terminal are matched to realize quick disassembly and assembly of the wire rod; the piezoresistor circuit is used for filtering high-voltage surge, when the voltage exceeds a threshold value, the resistance is reduced, the discharge tube circuit breaks down to form a discharge loop, and common-mode protection is achieved; and the trigger circuit acts surge voltage on the discharge tube circuit to realize the characteristic of low residual voltage.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection equipment, and in particular to a quick-connect surge protector. Background Technology

[0002] Surges are a common phenomenon in electrical equipment. A surge refers to a peak voltage and current that momentarily exceeds the stable value. These surges mainly originate from lightning strikes or electrical equipment faults, posing a serious threat to high-power or outdoor electrical equipment. Therefore, surge protection measures, such as lightning arresters, are usually installed to protect these devices.

[0003] Key parameters for evaluating surge protector performance include maximum continuous operating voltage, nominal current carrying capacity, and voltage protection level. Among these, the voltage protection level is a crucial indicator of the surge protector's protective effectiveness. In some cases, surge protectors need to pass a withstand voltage test of 1500V (AC) / 1min or higher along with the protected equipment to ensure effective common-mode protection. However, existing mature surge protectors or surge protection designs, while achieving low residual voltage protection, often fail the common-mode withstand voltage test because the surge protector will activate during the test. Conversely, designs that pass the withstand voltage test often have excessively high residual voltage, failing to achieve effective protection.

[0004] Furthermore, existing surge protectors are inconvenient to wire, hindering quick wiring and disconnection, which may delay the implementation of protective measures in emergencies. Therefore, developing a new type of surge protector that can achieve low residual voltage protection, pass common mode withstand voltage tests, and facilitate quick wiring and disconnection is a pressing issue in the current technological field. Utility Model Content

[0005] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a quick-connect surge protector. It integrates the circuit board, terminal assembly, and conductive terminals into the housing, and uses buttons, elastic retainers, and conductive terminals to achieve quick assembly and disassembly of the wires. It uses a varistor circuit to filter high-voltage surges. When the voltage exceeds the threshold, the resistance decreases, the discharge tube circuit breaks down to form a discharge circuit, and common-mode protection is achieved. The trigger circuit applies the surge voltage to the discharge tube circuit to achieve low residual voltage characteristics.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A quick-connect surge protector includes a housing, a circuit board mounted in the housing, a first terminal assembly, and a second terminal assembly. The housing has an internal space for mounting the circuit board, and one end of the housing has a first terminal slot for accommodating the first terminal assembly, while the other end has a second terminal slot for accommodating the second terminal assembly. The circuit board is mounted in the accommodating space, the first terminal assembly is mounted in the first terminal slot, and the second terminal assembly is mounted in the second terminal slot. The first and second terminal assemblies each include a terminal base, a conductive terminal, a resilient retainer, and a button. The terminal base has a terminal accommodating space and a wiring hole. The conductive terminal is located in the terminal accommodating space, and the resilient retainer abuts against the conductive terminal and the inner wall of the terminal base. The button is press-fitted onto the terminal base, with its lower end abutting against the resilient retainer. Pressing the button downwards separates the upper end of the resilient retainer from the conductive terminal. Releasing the button causes the upper end of the resilient retainer to clamp the conductive terminal, securing a wire inserted through the wiring hole.

[0008] As a preferred embodiment: the conductive terminal includes a pin portion, an extension portion, and a limiting portion, the pin portion, the extension portion, and the limiting portion are integrally connected, and a through hole is hollowed out in the extension portion; the terminal receiving space includes a limiting groove, an extension groove, and a socket, the limiting groove is located at the top inner side of the terminal base, the extension groove communicates with the limiting groove, and the socket is located at the bottom of the terminal base; the limiting portion of the conductive terminal is embedded in the limiting groove, the extension portion is held in the extension groove, and the pin portion extends out from the socket and is inserted into the circuit board; the rear end of the limiting portion has an integrally formed contact plate, and the contact plate extends into the button.

[0009] As a preferred embodiment: the elastic retaining member is hairpin shaped, having an abutting section, an elastic section, and a connecting section integrally connecting the abutting section and the elastic section. The abutting section and the elastic section extend from the through hole, with the abutting section abutting against the lower edge of the through hole. The elastic section is detachably elastically contacting the lower surface of the limiting portion of the conductive terminal. The wiring hole faces the contact position of the elastic section and the limiting portion. The lower end of the button abuts against the elastic end. A support post is provided on the inner side wall of the terminal base corresponding to the connecting section, and the connecting section is mounted on the support post. The abutting section of the elastic retaining member has a recessed portion in the middle, and a support post is provided on the inner side of the terminal base corresponding to the recessed portion. The support post and the recessed portion abut against each other.

[0010] As a preferred embodiment: the front end of the abutting section and the elastic section of the elastic retaining member respectively has a limiting bending portion for preventing the abutting end and the elastic section from disengaging from the through hole, and the limiting bending portion is blocked on the outer side of the edge of the through hole.

[0011] As a preferred embodiment: limit blocks are respectively provided on both sides of the button, and mounting holes are provided on the terminal block corresponding to the button. Limit edges are provided in the mounting holes corresponding to the limit blocks, and the limit blocks move away from or abut against the limit edges as the button is pressed.

[0012] As a preferred embodiment, the housing includes a base and a bottom cover, the bottom cover being detachably mounted on the lower end of the base, and having a fixing notch for installing a surge protector provided diagonally at the lower end of the base.

[0013] As a preferred embodiment: the circuit board is provided with a first power supply circuit, a second power supply circuit, a varistor circuit, a discharge tube circuit, and a trigger circuit. The first terminal of the varistor circuit is connected to the first power supply circuit and the trigger circuit, the second terminal of the varistor circuit is connected to the second power supply circuit and the trigger circuit, and the third terminal of the varistor circuit is connected to the discharge tube circuit. The discharge tube circuit is connected to the ground wire. When the first surge voltage of the first power supply circuit or the second surge voltage of the second power supply circuit reaches the first voltage threshold of the varistor circuit, the first surge voltage or the second surge voltage acts on the varistor circuit through the trigger circuit, the resistance value of the varistor circuit decreases, the current through the varistor circuit increases, and the voltage of the discharge tube circuit increases. When the voltage of the discharge tube circuit reaches the second voltage threshold of the discharge tube circuit, the discharge tube circuit is broken down, and the discharge tube circuit and the ground wire form a discharge loop.

[0014] As a preferred embodiment, the trigger circuit includes a first capacitor and a second capacitor;

[0015] The first terminal of the first capacitor is connected to the first power supply circuit and the varistor circuit respectively, the second terminal of the first capacitor is connected to the discharge tube circuit, the first terminal of the second capacitor is connected to the second power supply circuit and the varistor circuit respectively, and the second terminal of the second capacitor is connected to the discharge tube circuit;

[0016] When the first power supply circuit generates the first surge voltage, the first surge voltage is applied to the varistor circuit through the first capacitor;

[0017] When the second power supply circuit generates a second surge voltage, the second surge voltage acts on the varistor circuit through the second capacitor.

[0018] As a preferred solution, it also includes: differential mode protection circuit;

[0019] The differential mode protection circuit includes a first varistor and a first discharge tube. The first end of the first varistor is connected to the first power supply circuit and the varistor circuit respectively. The second end of the first varistor is connected to the first end of the first discharge tube. The second end of the first discharge tube is connected to the second power supply circuit and the varistor circuit respectively.

[0020] The first surge voltage is discharged to the second power supply circuit through the first varistor and the first discharge tube, and / or discharged to the second power supply circuit through the varistor circuit;

[0021] Alternatively, the second surge voltage may be discharged to the first power supply circuit through the first discharge tube and the first varistor, and / or discharged to the first power supply circuit through the varistor circuit;

[0022] It also includes a bleed resistor circuit;

[0023] The leakage resistor circuit includes a first leakage resistor and a second leakage resistor. The first end of the first leakage resistor is connected to the varistor circuit and the discharge tube circuit, respectively. The second end of the first leakage resistor is connected to the second leakage resistor, and the second leakage resistor is grounded.

[0024] When the voltage of the discharge tube circuit is less than the second voltage threshold of the discharge tube circuit, the voltage of the discharge tube circuit is discharged through the first bleeder resistor and the second bleeder resistor.

[0025] As a preferred embodiment, it also includes a fourth varistor and a fifth varistor;

[0026] The discharge tube circuit includes a second discharge tube and a third discharge tube. The first end of the second discharge tube is connected to the varistor circuit, the first end of the fourth varistor, and the first end of the first leakage resistor, respectively. The second end of the second discharge tube is connected to the first end of the third discharge tube, the second end of the fourth varistor, the first end of the fifth varistor, the second end of the first leakage resistor, and the first end of the second leakage resistor, respectively.

[0027] The first end of the third discharge tube is connected to the first end of the fifth varistor, the second end of the first leakage resistor, and the first end of the second leakage resistor, respectively. The second end of the third discharge tube is connected to the second end of the fifth varistor and the second end of the second leakage resistor, respectively, and then grounded.

[0028] The varistor circuit includes a second varistor and a third varistor;

[0029] The first end of the second varistor is connected to the first power supply circuit, the first varistor and the first capacitor respectively, and the second end of the second varistor is connected to the first end of the fourth varistor, the second discharge tube, the first leakage resistor and the third varistor respectively.

[0030] The first end of the third varistor is connected to the fourth varistor, the second discharge tube and the first leakage resistor, respectively, and the second end of the third varistor is connected to the second power supply circuit, the first discharge tube and the second capacitor, respectively.

[0031] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, a surge protector is formed by integrating a circuit board, a first terminal assembly, and a second segment assembly into a housing. This surge protector clamps and releases the wire through the cooperation of a button, an elastic retainer, and conductive terminals, enabling quick wire assembly and disassembly. Furthermore, a varistor circuit filters high-voltage surges. When the surge voltage exceeds a threshold, the resistance of the varistor circuit decreases, and the voltage of the discharge tube circuit increases, causing the discharge tube circuit to break down, thus forming a discharge loop and achieving common-mode protection. Moreover, a trigger circuit applies the surge voltage to the discharge tube circuit, thereby achieving a low residual voltage characteristic.

[0032] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of the surge protector of this utility model;

[0034] Figure 2 This is a three-dimensional schematic diagram of the surge protector of this utility model from another perspective;

[0035] Figure 3 This is an exploded perspective view of the surge protector of this utility model;

[0036] Figure 4 This is an exploded perspective view of the surge protector of this utility model.

[0037] Figure 5 This is a three-dimensional schematic diagram of the first terminal assembly of this utility model;

[0038] Figure 6 This is a first-view perspective three-dimensional schematic diagram of the internal structure of the first terminal assembly of this utility model;

[0039] Figure 7 This is a second-view perspective three-dimensional schematic diagram of the internal structure of the first terminal assembly of this utility model.

[0040] Figure 8 This is a third-view perspective three-dimensional schematic diagram of the internal structure of the first terminal assembly of this utility model.

[0041] Figure 9 This is a three-dimensional schematic diagram of the conductive terminal of this utility model;

[0042] Figure 10 This is a three-dimensional schematic diagram of the elastic retaining component of this utility model;

[0043] Figure 11 This is a schematic diagram of the surge protector circuit structure of this utility model;

[0044] Figure 12 This is a schematic diagram of the circuit structure of another embodiment of the surge protector of this utility model.

[0045] Explanation of reference numerals in the attached diagram:

[0046] 10. Housing; 11. Accommodating space; 12. First terminal slot; 13. Second terminal slot; 14. Base; 141. Fixing notch; 15. Bottom cover; 20. Circuit board; 30. First terminal assembly; 40. Second terminal assembly; 50. Terminal base; 51. Terminal accommodating space; 511. Limiting slot; 512. Extension slot; 513. Insertion hole; 52. Wiring hole; 53. Support post; 54. Mounting hole; 541. Limiting retaining edge; 60. Conductive terminal; 61. Pin portion; 62. Extension portion; 621. Through hole; 63. Limiting portion; 631. Contact plate; 70. Elastic retaining member; 71. Abutment section; 711. Recessed portion; 72. Elastic section; 73. 74. Connecting section; 80. Limiting bend; 81. Button; 82. Limiting block; L1. First power supply circuit; L2. Second power supply circuit; L3. Differential mode protection circuit; L4. Varistor circuit; L5. Discharge tube circuit; FT1. First temperature fuse; FT2. Second temperature fuse; MOV1. First varistor; MOV2. Second varistor; MOV3. Third varistor; MOV4. Fourth varistor; MOV5. Fifth varistor; GDT1. First discharge tube; GDT2. Second discharge tube; GDT3. Third discharge tube; R1. First bleeder resistor; R2. Second bleeder resistor; C1. First capacitor; C2. Second capacitor. Detailed Implementation

[0047] This utility model is as follows Figures 1 to 12 As shown, a quick-connect surge protector includes a housing 10, a circuit board 20 mounted in the housing 10, a first terminal assembly 30, and a second segment assembly 40, wherein:

[0048] The housing 10 has an internal accommodating space 11 for mounting the circuit board 20. One end of the housing 10 has a first terminal slot 12 for accommodating the first terminal assembly 30, and the other end has a second terminal slot 13 for accommodating the second terminal assembly 40. The circuit board 20 is mounted in the accommodating space, the first terminal assembly 30 is mounted in the first terminal slot 12, and the second terminal assembly 40 is mounted in the second terminal slot 13. The first terminal assembly 30 and the second terminal assembly 40 (which have the same structure but differ only in the number of conductive terminals) each include a terminal base 50, a conductive terminal 60, an elastic retainer 70, and a button 80. The terminal block 50 is provided with a terminal receiving space 51 and a wiring hole 52. The conductive terminal 60 is located in the terminal receiving space 51. The elastic retaining member 70 abuts against the conductive terminal 60 and the inner wall of the terminal block 50. The button 80 is pressable and installed on the terminal block 50. Its lower end abuts against the elastic retaining member 70. When the button 80 is pressed down, the upper end of the elastic retaining member 70 separates from the conductive terminal 60. When the button 80 is released, the upper end of the elastic retaining member 70 presses against the conductive terminal 60 to clamp the wire extending from the wiring hole 52. Thus, by using the cooperation of the button 80, the elastic retaining member 70 and the conductive terminal 60, the clamping and releasing of the wire can be achieved, realizing quick installation and removal of the wire.

[0049] The conductive terminal 60 includes a pin portion 61, an extension portion 62, and a limiting portion 63, which are integrally connected. A through hole 621 is provided in the extension portion 62. The terminal receiving space 51 includes a limiting groove 511, an extension groove 512, and a socket 513. The limiting groove 511 is located at the top inner side of the terminal base 50, the extension groove 512 communicates with the limiting groove 511, and the socket 513 is located at the bottom of the terminal base 50. The limiting part 63 of the conductive terminal 60 is embedded in the limiting groove 511, the extension part 62 is held in the extension groove 512, and the plug part 61 extends out from the plug hole 513 and is inserted into the circuit board 20; the rear end of the limiting part 63 has an integrally formed contact plate 631, which extends into the button 80; when the wire is clamped, it will make contact with the contact plate 631, and the setting of the contact plate 631 increases the contact stability between the conductive terminal 60 and the wire.

[0050] The elastic retaining member 70 is hairpin shaped to provide sufficient elastic force to the button 80 when it is pressed. The elastic retaining member 70 has an abutting section 71, an elastic section 72, and a connecting section 73 that integrally connects the abutting section 71 and the elastic section 72. The abutting section 71 and the elastic section 72 extend from the through hole 621, and the abutting section 71 abuts against the lower edge of the through hole 621. The elastic section 72 is detachably elastically contacted on the lower surface of the limiting part 63 of the conductive terminal 60. The wiring hole 52 faces the contact position of the elastic section 72 and the limiting part 63. The lower end of the button 80 abuts against the elastic end. A support post 53 is provided on the inner side wall of the terminal block 50 corresponding to the connecting section 73, and the connecting section 73 is installed on the support post 53; the abutting section 71 of the elastic retainer 70 has a recessed portion 711 in the middle, and a support post 53 is also provided on the inner side of the terminal block 50 corresponding to the recessed portion 711. The support post 53 and the recessed portion 711 abut against each other to form a strong support for the recessed portion 711.

[0051] The front ends of the abutting section 71 and the elastic section 72 of the elastic retaining member 70 are respectively provided with a limiting bending portion 74 for preventing the abutting end and the elastic section 72 from disengaging from the through hole 621. The limiting bending portion 74 is blocked on the outer side of the edge of the through hole 621.

[0052] Limiting blocks 81 are respectively provided on both sides of the button 80. The terminal block 50 is provided with a mounting hole 54 corresponding to the button 80. A limiting edge 541 is provided in the mounting hole 54 corresponding to the limiting block 81. The limiting block 81 moves away from or abuts against the limiting edge 541 as the button 80 is pressed, so as to prevent the button 80 from completely disengaging from the terminal block 50.

[0053] The housing 10 includes a base 14 and a bottom cover 15. The bottom cover 15 is detachably installed on the lower end of the base 14, and a fixing notch 141 for installing a surge protector is provided diagonally on the lower end of the base 14.

[0054] The circuit board 20 is provided with a first power supply circuit L1, a second power supply circuit L2, a varistor circuit L4, a discharge tube circuit L5, and a trigger circuit. The first end of the varistor circuit L4 is connected to the first power supply circuit L1 and the trigger circuit, the second end of the varistor circuit L4 is connected to the second power supply circuit L2 and the trigger circuit, the third end of the varistor circuit L4 is connected to the discharge tube circuit L5, and the discharge tube circuit L5 is connected to the ground wire.

[0055] When the first power supply circuit L1 or the second power supply circuit L2 is affected by lightning or the electrical equipment itself, it will generate surge voltages of different magnitudes. Since both the first power supply line and the second power supply line are connected to the trigger circuit and the varistor circuit L4.

[0056] Therefore, when the first surge voltage of the first power supply circuit L1 or the second surge voltage of the second power supply circuit L2 reaches the first voltage threshold of the varistor circuit L4, the first surge voltage or the second surge voltage of the first power supply circuit L1 acts on the varistor circuit L4 through the trigger circuit. The varistor circuit L4 can be composed of varistors. When the voltage is low, i.e., within its nominal value, the varistor exhibits an infinite resistance. Only when the voltage exceeds its nominal value will the varistor rapidly break down and conduct. That is, the resistance value of the varistor circuit L4 rapidly decreases. Since the varistor circuit L4 is connected to the discharge tube circuit L5, when the resistance value of the varistor circuit L4 rapidly decreases, the current through the varistor circuit L4 increases, thereby increasing the voltage of the discharge tube circuit L5.

[0057] When the voltage of the discharge tube circuit L5 reaches the second voltage threshold of the discharge tube circuit L5, the discharge tube circuit L5 is broken down. Since the discharge tube circuit L5 is grounded, the discharge tube circuit L5 and the ground wire form a discharge loop, thereby achieving the effect of common mode protection. The discharge tube circuit L5 can be a low pulse discharge tube.

[0058] In this embodiment, high voltage surge is filtered through the varistor circuit L4. When the surge voltage exceeds the threshold, the resistance of the varistor circuit L4 decreases and the voltage of the discharge tube circuit L5 increases, causing the discharge tube circuit L5 to break down, thereby forming a discharge circuit and achieving common mode protection. Moreover, the surge voltage is applied to the discharge tube circuit L5 through the trigger circuit, and the discharge tube circuit L5 can use a low-pulse discharge tube to achieve the characteristic of low residual voltage.

[0059] In one embodiment, the trigger circuit includes a first capacitor C1 and a second capacitor C2;

[0060] The first terminal of the first capacitor C1 is connected to the first power supply circuit L1 and the varistor circuit L4 respectively, and the second terminal of the first capacitor C1 is connected to the discharge tube circuit L5. The first terminal of the second capacitor C2 is connected to the second power supply circuit L2 and the varistor circuit L4 respectively, and the second terminal of the second capacitor C2 is connected to the discharge tube circuit L5.

[0061] Specifically, the first capacitor C1 and the second capacitor C2 can be high-voltage capacitors. Since the first power supply circuit L1 is connected to the first capacitor C1 and the varistor circuit L4 respectively, and the second power supply circuit L2 is connected to the second capacitor C2 and the varistor circuit L4 respectively, when the surge voltage on the first power supply circuit L1 and / or the second power supply circuit L2 is high, due to the presence of the first capacitor C1 and the second capacitor C2, the first capacitor C1 and the second capacitor C2 will be synchronously high-voltage, and the high voltage will be applied to the varistor circuit L4, thereby achieving the effect of common-mode protection.

[0062] In one embodiment, the circuit further includes a differential mode protection circuit L3; the differential mode protection circuit L3 includes a first varistor MOV1 and a first discharge tube GDT1, the first end of the first varistor MOV1 is connected to the first power supply circuit L1 and the varistor circuit L4 respectively, the second end of the first varistor MOV1 is connected to the first end of the first discharge tube GDT1, and the second end of the first discharge tube GDT1 is connected to the second power supply circuit L2 and the varistor circuit L4 respectively; the first surge voltage is discharged to the second power supply circuit L2 through the first varistor MOV1 and the first discharge tube GDT1, and / or discharged to the second power supply circuit L2 through the varistor circuit L4; or, the second surge voltage is discharged to the first power supply circuit L1 through the first discharge tube GDT1 and the first varistor MOV1, and / or discharged to the first power supply circuit L1 through the varistor circuit L4.

[0063] Specifically, when a surge voltage is applied to the first power supply circuit L1 or the second power supply circuit L2, the surge voltage of one power supply circuit is higher, while the other is unaffected. In this case, the surge voltage can be discharged through the two power supply circuits.

[0064] Among them, the first varistor MOV1 and the first discharge tube GDT1 can form a first discharge circuit to discharge most of the surge voltage of the first power supply circuit L1 or the second power supply circuit L2 to another power supply circuit, thereby playing the role of differential mode protection.

[0065] In one embodiment, the surge protector further includes a bleed resistor circuit; the bleed resistor circuit includes a first bleed resistor R1 and a second bleed resistor R2, the first end of the first bleed resistor R1 is connected to the varistor circuit L4 and the discharge tube circuit L5 respectively, the second end of the first bleed resistor R1 is connected to the second bleed resistor R2, and the second bleed resistor R2 is grounded; when the voltage of the discharge tube circuit L5 is less than the second voltage threshold of the discharge tube circuit L5, the voltage of the discharge tube circuit L5 is bleed through the first bleed resistor R1 and the second bleed resistor R2.

[0066] Specifically, when the voltage of the first surge voltage or the second surge voltage exceeds the nominal value of the varistor circuit L4, but does not reach the breakdown value of the discharge tube circuit L5, the varistor circuit L4 will conduct under high voltage, but the discharge tube circuit L5 will not conduct. At this time, the surge voltage can be discharged through the bleed circuit composed of the first bleed resistor R1 and the second bleed resistor R2, thereby ensuring the safety of the circuit.

[0067] In one embodiment, the surge protector further includes: a fourth varistor MOV4 and a fifth varistor MOV5; the discharge tube circuit L5 includes a second discharge tube GDT2 and a third discharge tube GDT3, the first end of the second discharge tube GDT2 is connected to the first end of the varistor circuit L4, the first end of the fourth varistor MOV4 and the first end of the first bleeder resistor R1 respectively, the second end of the second discharge tube GDT2 is connected to the first end of the third discharge tube GDT3, the second end of the fourth varistor MOV4, the first end of the fifth varistor MOV5, the second end of the first bleeder resistor R1 and the first end of the second bleeder resistor R2 respectively; the first end of the third discharge tube GDT3 is connected to the first end of the fifth varistor MOV5, the second end of the first bleeder resistor R1 and the first end of the second bleeder resistor R2 respectively, and the second end of the third discharge tube GDT3 is connected to the second end of the fifth varistor MOV5 and the second bleeder resistor R2 and then grounded.

[0068] Specifically, in order to test the withstand voltage between the first power supply circuit L1 or the second power supply circuit L2 and the ground wire, the fourth varistor MOV4 and the fifth varistor MOV5 can be used for testing.

[0069] The withstand voltage value can be achieved by adjusting the settings of specific components. For example, if the withstand voltage leakage current is set to 1mA, the specific formula for calculating the withstand voltage value is as follows:

[0070] Withstand voltage value = Nominal voltage of second varistor MOV2 + Nominal voltage of fourth varistor MOV4 + Nominal voltage of fifth varistor MOV5.

[0071] Among them, the withstand voltage value is calculated based on the peak voltage for AC and the specific value for DC.

[0072] The breakdown voltage of the second discharge tube GDT2 and the third discharge tube GDT3 must be greater than the nominal voltage of the fourth varistor and the fifth varistor. This ensures that the second discharge tube GDT2 and the third discharge tube GDT3 cannot operate when the withstand voltage is tested. The leakage current only passes through the fourth varistor and the fifth varistor, as well as the first bleeder resistor R1 and the second bleeder resistor R2, and does not form a circuit through the second discharge tube GDT2 and the third discharge tube GDT3.

[0073] The withstand voltage leakage current passes through the second or third varistor, then through the first bleed resistor R1 and the fourth varistor MOV4, and the second bleed resistor R2 and the fifth varistor MOV5 to the ground wire. This allows the 1mA leakage current to be shunt through the first bleed resistor R1, the second bleed resistor R2, and the fourth and fifth varistor MOV4 and MOV5. The current on the fourth and fifth varistor MOV4 and MOV5 does not exceed 1mA, and the voltage across the fourth and fifth varistor MOV4 and MOV5 is within the nominal value. The breakdown voltage of the discharge tube is higher than the discharge voltage of the fourth and fifth varistor MOV4 and MOV5, but it will not break down, thus achieving the withstand voltage setting.

[0074] See Figure 12 In the voltage withstand test, since the first bleeder resistor R1 and the second bleeder resistor R2 are not involved in the calculation process, the first bleeder resistor R1 and the second bleeder resistor R2 can also be removed.

[0075] In one embodiment, the varistor circuit L4 includes a second varistor MOV2 and a third varistor MOV3, wherein the second varistor MOV2 and the third varistor MOV3 can be varistors.

[0076] The first terminal of the second varistor MOV2 is connected to the first power supply circuit L1, the first varistor MOV1, and the first capacitor C1, respectively. The second terminal of the second varistor MOV2 is connected to the first terminal of the fourth varistor MOV4, the second discharge tube GDT2, the first bleeder resistor R1, and the third varistor MOV3, respectively. The first terminal of the third varistor MOV3 is connected to the fourth varistor MOV4, the second discharge tube GDT2, and the first bleeder resistor R1, respectively. The second terminal of the third varistor MOV3 is connected to the second power supply circuit L2, the first discharge tube GDT1, and the second capacitor C2, respectively.

[0077] Specifically, when the voltage of the first surge voltage or the second surge voltage exceeds the nominal value of the varistor circuit L4, but does not reach the breakdown value of the discharge tube circuit L5, the varistor circuit L4 will conduct under high voltage, but the discharge tube circuit L5 will not conduct. At this time, most of the surge voltage can be discharged through the bleed circuit composed of the first bleed resistor R1 and the second bleed resistor R2, and a small part of the surge voltage can be discharged through the second varistor MOV2 and the third varistor MOV3, thereby ensuring the safety of the circuit.

[0078] In one embodiment, the surge protector further includes: a first thermal fuse FT1 and a second thermal fuse FT2, wherein the first thermal fuse FT1 is connected to the first power supply circuit L1 and the varistor circuit L4 respectively, and the second thermal fuse FT2 is connected to the second power supply circuit L2 and the varistor circuit L4 respectively.

[0079] Specifically, a thermal fuse is a temperature-sensing circuit cut-off device. A thermal fuse senses overheating generated during abnormal operation of an electrical or electronic product, thereby cutting off the circuit to prevent fire. When the temperature of the first power supply circuit L1 or the second power supply circuit L2 becomes too high, the first thermal fuse FT1 or the second thermal fuse FT2 will trip to protect the device and prevent a fire.

[0080] The key design feature of this invention is that it integrates a circuit board, a first terminal assembly, and a second segment assembly into a housing to form a surge protector. This surge protector clamps and releases the wire through the cooperation of a button, a spring-loaded retainer, and conductive terminals, enabling quick wire assembly and disassembly. Furthermore, a varistor circuit filters high-voltage surges. When the surge voltage exceeds a threshold, the resistance of the varistor circuit decreases, and the voltage of the discharge tube circuit increases, causing the discharge tube circuit to break down, thus forming a discharge loop and providing common-mode protection. Moreover, a trigger circuit applies the surge voltage to the discharge tube circuit, achieving a low residual voltage characteristic.

[0081] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A quick-connect surge protector, characterized in that: The device includes a housing, a circuit board mounted in the housing, a first terminal assembly, and a second terminal assembly. The housing has an internal space for mounting the circuit board. One end of the housing has a first terminal slot for accommodating the first terminal assembly, and the other end has a second terminal slot for accommodating the second terminal assembly. The circuit board is mounted in the accommodating space, the first terminal assembly is mounted in the first terminal slot, and the second terminal assembly is mounted in the second terminal slot. The first and second terminal assemblies each include a terminal base, a conductive terminal, a resilient retainer, and a button. The terminal base has a terminal accommodating space and a wiring hole. The conductive terminal is located in the terminal accommodating space, and the resilient retainer abuts against the conductive terminal and the inner wall of the terminal base. The button is press-fitted onto the terminal base, with its lower end abutting against the resilient retainer. Pressing the button downwards separates the upper end of the resilient retainer from the conductive terminal. Releasing the button causes the upper end of the resilient retainer to clamp the conductive terminal, securing a wire inserted through the wiring hole.

2. The quick-connect surge protector according to claim 1, characterized in that: The conductive terminal includes a pin portion, an extension portion, and a limiting portion, which are integrally connected. A through hole is provided in the extension portion. The terminal receiving space includes a limiting groove, an extension groove, and a socket. The limiting groove is located at the top of the inner side of the terminal base. The extension groove communicates with the limiting groove. The socket is located at the bottom of the terminal base. The limiting part of the conductive terminal is embedded in the limiting groove, the extension part is held in the extension groove, and the pin part extends out of the socket and is inserted into the circuit board; the rear end of the limiting part has an integrally formed contact plate, and the contact plate extends into the button.

3. The quick-connect surge protector according to claim 2, characterized in that: The elastic retaining member is hairpin shaped and has an abutting section, an elastic section, and a connecting section that integrally connects the abutting section and the elastic section. The abutting section and the elastic section extend from the through hole, and the abutting section abuts against the lower edge of the through hole. The elastic section is detachably elastically contacting the lower surface of the limiting part of the conductive terminal. The wiring hole faces the contact position of the elastic section and the limiting part. The lower end of the button abuts against the elastic section. A support post is provided on the inner side wall of the terminal base corresponding to the connecting section, and the connecting section is installed on the support post. The abutting section of the elastic retaining member has a recessed portion in the middle, and a support post is provided on the inner side of the terminal base corresponding to the recessed portion. The support post and the recessed portion abut against each other.

4. The quick-connect surge protector according to claim 3, characterized in that: The front ends of the abutting section and the elastic section of the elastic retaining member are respectively provided with a limiting bending portion for preventing the abutting section and the elastic section from disengaging from the through hole, and the limiting bending portion is blocked on the outer side of the edge of the through hole.

5. The quick-connect surge protector according to claim 1, characterized in that: Limiting blocks are respectively provided on both sides of the button. The terminal block is provided with a mounting hole corresponding to the button. A limiting edge is provided in the mounting hole corresponding to the limiting block. The limiting block moves away from or abuts against the limiting edge as the button is pressed.

6. The quick-connect surge protector according to claim 1, characterized in that: The housing includes a base and a bottom cover. The bottom cover is detachably installed at the lower end of the base and has a fixing notch for installing a surge protector at a diagonal arrangement at the lower end of the base.

7. The quick-connect surge protector according to claim 1, characterized in that: The circuit board is equipped with a first power supply circuit, a second power supply circuit, a varistor circuit, a discharge tube circuit, and a trigger circuit. The first terminal of the varistor circuit is connected to both the first power supply circuit and the trigger circuit. The second terminal of the varistor circuit is connected to both the second power supply circuit and the trigger circuit. The third terminal of the varistor circuit is connected to the discharge tube circuit, which is connected to ground. When a first surge voltage of the first power supply circuit or a second surge voltage of the second power supply circuit reaches a first voltage threshold of the varistor circuit, the first surge voltage or the second surge voltage acts on the varistor circuit through the trigger circuit, causing the resistance of the varistor circuit to decrease and the current through the varistor circuit to increase, thus increasing the voltage of the discharge tube circuit. When the voltage of the discharge tube circuit reaches a second voltage threshold of the discharge tube circuit, the discharge tube circuit is broken down, and the discharge tube circuit and the ground wire form a discharge loop.

8. The quick-connect surge protector according to claim 7, characterized in that, The trigger circuit includes a first capacitor and a second capacitor; The first terminal of the first capacitor is connected to the first power supply circuit and the varistor circuit respectively, the second terminal of the first capacitor is connected to the discharge tube circuit, the first terminal of the second capacitor is connected to the second power supply circuit and the varistor circuit respectively, and the second terminal of the second capacitor is connected to the discharge tube circuit; When the first power supply circuit generates the first surge voltage, the first surge voltage is applied to the varistor circuit through the first capacitor; When the second power supply circuit generates a second surge voltage, the second surge voltage acts on the varistor circuit through the second capacitor.

9. The quick-connect surge protector according to claim 8, characterized in that, The surge protector also includes: a differential mode protection circuit; The differential mode protection circuit includes a first varistor and a first discharge tube. The first end of the first varistor is connected to the first power supply circuit and the varistor circuit respectively. The second end of the first varistor is connected to the first end of the first discharge tube. The second end of the first discharge tube is connected to the second power supply circuit and the varistor circuit respectively. The first surge voltage is discharged to the second power supply circuit through the first varistor and the first discharge tube, and / or discharged to the second power supply circuit through the varistor circuit; Alternatively, the second surge voltage may be discharged to the first power supply circuit through the first discharge tube and the first varistor, and / or discharged to the first power supply circuit through the varistor circuit; It also includes a bleed resistor circuit; The leakage resistor circuit includes a first leakage resistor and a second leakage resistor. The first end of the first leakage resistor is connected to the varistor circuit and the discharge tube circuit, respectively. The second end of the first leakage resistor is connected to the second leakage resistor, and the second leakage resistor is grounded. When the voltage of the discharge tube circuit is less than the second voltage threshold of the discharge tube circuit, the voltage of the discharge tube circuit is discharged through the first bleeder resistor and the second bleeder resistor.

10. The quick-connect surge protector according to claim 9, characterized in that, Also includes: The fourth and fifth varistors; The discharge tube circuit includes a second discharge tube and a third discharge tube. The first end of the second discharge tube is connected to the varistor circuit, the first end of the fourth varistor, and the first end of the first leakage resistor, respectively. The second end of the second discharge tube is connected to the first end of the third discharge tube, the second end of the fourth varistor, the first end of the fifth varistor, the second end of the first leakage resistor, and the first end of the second leakage resistor, respectively. The first end of the third discharge tube is connected to the first end of the fifth varistor, the second end of the first leakage resistor, and the first end of the second leakage resistor, respectively. The second end of the third discharge tube is connected to the second end of the fifth varistor and the second end of the second leakage resistor, respectively, and then grounded. The varistor circuit includes a second varistor and a third varistor; The first end of the second varistor is connected to the first power supply circuit, the first varistor and the first capacitor respectively, and the second end of the second varistor is connected to the first end of the fourth varistor, the second discharge tube, the first leakage resistor and the third varistor respectively. The first end of the third varistor is connected to the fourth varistor, the second discharge tube and the first leakage resistor, respectively, and the second end of the third varistor is connected to the second power supply circuit, the first discharge tube and the second capacitor, respectively.

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