Surge protection device, device and system

Abstract

The invention provides a surge protection device, device and system. The surge protection device comprises an electrode and an insulation assembly which are oppositely arranged. The opposite surfaces of the oppositely arranged electrodes are each provided with at least one conductive protrusion, and the conductive protrusions are configured to extend in the direction close to the conductive protrusions on the opposite electrodes; the insulating component is arranged between the oppositely arranged electrodes and forms a surge channel in a surrounding manner; wherein under the excitation of the surge voltage, a surge channel between the electrodes of the surge protection device is conducted so as to discharge the surge voltage; the distance between the top ends, close to each other, of the conductive protrusions on the electrodes is a first preset distance, the first preset distance meets a preset condition, and the impedance of the surge protection device under the surge voltage is smaller than that of the protected device under the surge voltage; wherein the preset condition comprises that the first preset distance is greater than the preset safety distance. According to the scheme, the surge voltage can be effectively discharged while the safety requirement is met.

Description

Technical Field

[0001] The disclosed embodiments of the present application relate to the field of electrical engineering technology, and more specifically, to a surge protection device, apparatus, and system. Background Art

[0002] Surge is a momentary overvoltage phenomenon that exceeds the normal operating voltage. It is generally a violent pulse that occurs in just one millionth of a second and can cause damage to equipment.

[0003] In order to protect related equipment from being damaged by surges, surge protection solutions are configured for important equipment. However, the current surge protection solutions cannot effectively discharge surge voltage while meeting safety regulations.

[0004] Therefore, how to effectively discharge surge voltage while meeting safety regulations has become an urgent problem to be solved. Summary of the invention

[0005] According to the embodiments of the present application, the present invention provides a surge protection device, apparatus and system to effectively discharge surge voltage while meeting safety requirements.

[0006] According to one aspect of the present application, a surge protection device is disclosed, which is applied to a surge protection apparatus to prevent a surge voltage from entering a protected device, the surge protection device comprising relatively arranged electrodes and an insulating component; the relatively arranged electrodes respectively have at least one conductive protrusion on their relatively surfaces, and the conductive protrusion is configured to extend in a direction close to the conductive protrusion on the opposite electrode; the insulating component is arranged between the relatively arranged electrodes and surrounds to form a surge channel; wherein, under the excitation of a surge voltage, the surge channel between the electrodes of the surge protection device is turned on to discharge the surge voltage; the distance between the mutually close top ends of the conductive protrusions on the electrodes is a first preset distance, the first preset distance satisfies a preset condition, and the impedance of the surge protection device under the surge voltage is less than the impedance of the protected device under the surge voltage; wherein the preset condition includes that the first preset distance is greater than a preset safety distance.

[0007] The above scheme, by arranging at least one conductive protrusion on the oppositely arranged electrodes of the surge protection device, can make the surge channel more easily conducted when a surge voltage is applied to the oppositely arranged electrodes, and at the same time make the impedance of the surge protection device smaller than the impedance of the protected device, so that when a surge voltage appears at both ends of the electrodes under the condition that the first preset distance is greater than the preset safety distance, the surge voltage can be discharged in time. Therefore, the surge voltage can be effectively discharged while meeting the safety requirements.

[0008] According to the second aspect of the present application, a surge protection device is disclosed, comprising an input end, a first protection module, an output end, and the surge protection device in the above-mentioned first aspect; the input end is used to connect to the protected device; the first end of the first protection module is connected to the input end, and the second end is connected to the protective grounding end; the output end is connected to the grounding end, and the output end is also used to connect to the protected device; one electrode of the surge protection device is connected to the third end of the first protection module, and the other electrode is connected to the output end; wherein, when a surge voltage is input from the input end, the surge voltage is discharged to the protective grounding end and the grounding end in turn through the first protection module and the surge protection device.

[0009] The above scheme, by connecting the first protection module and the surge protection device to the protected device, when a surge voltage is generated, the surge voltage can be timely discharged from the first protection module and the surge protection device. By providing at least one conductive protrusion on the electrodes arranged opposite to each other of the surge protection device, when a surge voltage is applied to the electrodes arranged opposite to each other, the surge channel can be more easily conducted, and at the same time, the impedance of the surge protection device is made smaller than the impedance of the protected device, so that the first preset distance can be greater than the preset safety distance, and when a surge voltage appears at both ends of the electrodes, the surge voltage can be discharged in time, so that the surge voltage can be effectively discharged while meeting the safety requirements.

[0010] According to the third aspect of the present application, a surge protection system is disclosed, comprising a protected device, the surge protection device of the second aspect, a power input terminal and a power output terminal, wherein the power input terminal is respectively connected to the protected device and the input terminal of the surge protection device; the power output terminal is respectively connected to the protected device and the output terminal of the surge protection device; wherein when a surge voltage is input from the power input terminal, the surge voltage flows to the power output terminal through the surge protection device.

[0011] The above scheme, by connecting the first protection module and the surge protection device to the protected device, when a surge voltage is generated, the surge voltage can be timely discharged from the first protection module and the surge protection device. By providing at least one conductive protrusion on the electrodes arranged opposite to each other of the surge protection device, when a surge voltage is applied to the electrodes arranged opposite to each other, the surge channel can be more easily conducted, and at the same time, the impedance of the surge protection device is made smaller than the impedance of the protected device, so that the first preset distance can be greater than the preset safety distance, and when a surge voltage appears at both ends of the electrodes, the surge voltage can be discharged in time, so that the surge voltage can be effectively discharged while meeting the safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present application will be further described below in conjunction with the accompanying drawings and implementation methods, in which: Figure 1is a schematic structural diagram of a surge protection device in an embodiment of the present application; Figure 2 This is a schematic diagram of the connection relationship between the surge protection device and the protected device in one embodiment of the present application; Figure 3 is a schematic diagram of a protected device in an embodiment of the present application; Figure 4 It is a schematic diagram of the framework of an embodiment of a surge protection device of the present application; Figure 5 is a schematic diagram of a framework of another embodiment of the surge protection device of the present application; Figure 6 It is a schematic diagram of the framework of an embodiment of the surge protection system of the present application. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0014] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless otherwise clearly indicated above, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0015] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0016] It should be understood that the terms "include", "comprises" or any other variations used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0017] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The presence of the phrase at each location in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0018] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of a surge protection device in an embodiment of the present application; the surge protection device 100 is applied to a surge protection device to prevent the surge voltage from entering the protected device, and the surge protection device 100 includes electrodes 110 and an insulating component 120 arranged opposite to each other; the opposite surfaces of the electrodes 110 arranged opposite to each other respectively have at least one conductive protrusion 111, and the conductive protrusion 111 is configured to extend in a direction close to the conductive protrusion 111 on the opposite electrode 110; the insulating component 120 is arranged between the opposite electrodes 110 and surrounds to form a surge channel; wherein, under the excitation of the surge voltage, the surge channel between the electrodes 110 of the surge protection device 100 is turned on to discharge the surge voltage; the distance between the mutually close top ends of the conductive protrusions 111 on the electrodes 110 is a first preset distance, the first preset distance meets the preset condition, and the impedance of the surge protection device 100 under the surge voltage is less than the impedance of the protected device under the surge voltage; wherein the preset condition includes that the first preset distance is greater than the preset safety distance.

[0019] In the above scheme, by setting at least one conductive protrusion 111 on the oppositely arranged electrodes 110 of the surge protection device 100, when a surge voltage is applied to the oppositely arranged electrodes 110, the surge channel can be more easily conducted, and at the same time, the impedance of the surge protection device 100 is made smaller than the impedance of the protected device, so that when a surge voltage appears at both ends of the electrode 110 under the condition that the first preset distance is greater than the preset safety distance, the surge voltage can be discharged in time. Therefore, the surge voltage can be effectively discharged while meeting the safety requirements.

[0020] Common surge voltages are 10KV, 15KV, 20KV, 25KV, 30KV, etc. In the present application, the surge voltage may be a voltage greater than 5KV.

[0021] like Figure 1 As shown, the electrode 110 is disposed on two opposite surfaces of the surge protection device 100, and the electrode 110 may be a plate-shaped electrode 110. The shape of the electrode 110 may be as follows: Figure 1 The shape is shown as a square, in other embodiments, it may also be a circle, a triangle, etc., which is not limited by the present application. Correspondingly, the insulating component 120 surrounds the two electrodes 110 disposed opposite to each other, so that the space surrounded by the electrode 110 and the insulating component 120 forms a surge channel, and at least one conductive protrusion 111 formed on the electrode 110 is located inside the space surrounded by the electrode 110 and the insulating component 120. In other words, the conductive protrusion 111 is located on the surge channel.

[0022] The preset safety distance refers to the minimum value of the distance between the mutually adjacent tops of the conductive protrusions 111 on the electrode 110 when the safety requirements are met. For example, if the preset safety distance is 4.5 mm, the distance between the mutually adjacent tops of the conductive protrusions 111 on the electrode 110, i.e., the first preset distance, cannot be less than 4.5 mm. For example, if the safety requirement is that the insulation distance of the surge protection device 100 is greater than 4.5 mm, then the actual path distance of the surge discharge end of the surge protection device 100 must be greater than 4.5 mm, and the actual path distance of the surge discharge end is the distance between the mutually adjacent tops of the conductive protrusions 111 (the first preset distance). The insulation distance refers to the distance between two non-contacting conductors that maintain an insulation state under a certain voltage in practice. It needs to meet the safety requirements, i.e., it needs to be greater than the preset safety distance. For example, at a voltage of 1KV, the distance between the conductors is required to be at least 1 mm (i.e., the preset safety distance is 1 mm) to maintain insulation between the two conductors, and the insulation distance needs to be greater than 1 mm. Under the condition of meeting safety requirements, the first preset distance can be set according to actual needs.

[0023] Safety regulations require that the distance between conductors be no less than a preset safety distance, and the preset safety distance is usually larger. For example, if the electrode 110 of the surge protection device 100 does not have a conductive protrusion 111, the safety regulations require that the distance between the two electrodes 110 be no less than the preset safety distance. If the distance between the electrodes 110 is greater than the safety distance, the threshold voltage for the surge channel to be turned on will increase. Even if a surge voltage is generated, the surge voltage cannot be discharged through the surge channel, and thus the protection effect on the protected device cannot be achieved. However, the present application reduces the threshold voltage for the surge channel to be turned on by means of the conductive protrusion 111 on the electrode 110 while the first preset distance is greater than the preset safety distance, so that the surge voltage can be discharged in time when a surge voltage appears at both ends of the electrode 110 under the condition that the first preset distance is greater than the preset safety distance. Therefore, the surge voltage can be effectively discharged while meeting the safety requirements.

[0024] It can be understood that the threshold voltage for the surge channel to be turned on means that when the voltage at both ends of the surge channel (ie, the voltage between the electrodes 110 disposed oppositely) is greater than the threshold voltage, the surge channel is broken down to form a current path.

[0025] In some embodiments, Figure 1 As shown, the surge protection device 100 has electrodes 110 arranged opposite to each other, and at least one conductive protrusion 111 is provided on the electrodes 110 arranged opposite to each other, and the conductive protrusion 111 is configured to extend in a direction close to the conductive protrusion 111 on the opposite electrode 110. The conductive protrusion 111 is configured to have a shape with a larger bottom area and a smaller top area, such as a cone. Since the area of ​​the conductive protrusion 111 is small, through tip discharge, when a surge voltage is generated at both ends of the electrode 110 under the condition of a large first preset distance, the surge channel can also be turned on, thereby discharging the surge voltage. The shape of the conductive protrusion 111 is not limited to a cone, and can also be a hemispherical shape, etc.

[0026] In this embodiment, by providing a conductive protrusion 111 on the electrode 110, compared with the technical solution in which the conductive protrusion 111 is not provided, the distance between the electrodes 110 can be increased so as to meet the safety requirements. When a surge voltage is generated at both ends of the electrode 110, the surge channel can be turned on to discharge the surge voltage. Therefore, the surge voltage can be effectively discharged while meeting the safety requirements.

[0027] In some embodiments, the number of conductive protrusions 111 can be 1, 2, 3, 4, etc., and the present application does not impose any limitation on this; the number of conductive protrusions 111 on two opposite electrodes 110 can be equal or unequal, and the present application does not impose any limitation on this.

[0028] In some embodiments, the conductive protrusion 111 may be made of an iron-aluminum alloy material having good conductivity, and the top of the conductive protrusion 111 may be coated with metal copper to prevent oxidation of the top after multiple discharges.

[0029] In some embodiments, please refer to Figure 1 The insulating component 120 is arranged between the electrodes 110 and surrounds the electrodes 110. The insulating component 120 and the two opposite electrodes 110 surround and form a surge channel. The surge channel serves as a flow channel for the surge voltage. When a surge voltage is generated at both ends of the electrodes 110, the surge voltage can be transmitted from one of the electrodes 110 to the other electrode 110 through the surge channel, thereby discharging the surge voltage.

[0030] In some embodiments, the surge channel may be a vacuum. Since the conductive protrusion 111 is directly exposed to the surge channel, some gases (such as oxygen, etc.) in the surge channel may cause the conductive protrusion 111 to be oxidized, thereby affecting the discharge effect. Therefore, setting the surge channel to a vacuum can prevent the conductive protrusion 111 from being oxidized, thereby improving the reliability and service life of the surge protection device 100. In some other embodiments, an inert gas may also be filled in the surge channel.

[0031] In some embodiments, the electrode 110 is a metal plate (not shown), which has a terminal 112 and at least one conductive protrusion 111; when the surge channel between the oppositely arranged electrodes 110 is connected, the conductive protrusion 111 conducts the surge voltage to the terminal 112 through the metal plate.

[0032] In some embodiments, the safety regulations require that the creepage distance of the surge protection device 100 is greater than a preset creepage distance; for example, the preset creepage distance is 6 mm. In this embodiment, the creepage distance is a second preset distance between the surfaces of the electrodes 110 disposed opposite to each other. In this embodiment, Figure 1 , the distance between the surfaces of the electrodes 110 is the length of the insulating component 120 .

[0033] It is understandable that, according to different safety requirements, the first preset distance and the length of the insulating assembly 120 can be adjusted. Depending on the altitude, the safety requirements will also change accordingly.

[0034] In some embodiments, the insulating component 120 is made of insulating material, such as silicon dioxide, etc. The conductive protrusion 111 is made of iron-aluminum alloy material. The surface of the electrode 110 is made of aluminum-iron alloy material.

[0035] Please refer to Figure 2 , Figure 2 2 is a schematic diagram of the connection relationship between the surge protection device and the protected device 210 in one embodiment of the present application; Figure 2 As shown, the surge protection device 100 is connected to both ends of the protected device 210, and one end is connected to the power input end, and the other end is connected to the power output end; when a surge voltage is generated at the power input end, in order to prevent the protected device 210 from being affected by the surge voltage, the surge protection device 100 needs to be turned on in time under the impact of the surge voltage, so that the surge current flows through the surge protection device 100 to the power output end, so that the surge current does not pass through the protected device 210. In order to make the surge current flow out from the power output end through the surge protection device 100 without passing through the protected device 210, it is necessary to make the impedance of the surge protection device 100 under the surge voltage smaller than that of the protected device 210. The impedance of the surge protection device 100 under the surge voltage is smaller than that of the protected device 210, which means that when a surge voltage is applied to both ends of the surge protection device 100 (that is, a surge voltage is applied between the power input end and the power output end), the blocking effect of the surge protection device 100 on the surge current is smaller than the blocking effect of the protected device 210 on the surge current. Therefore, when a surge voltage is applied between the power input terminal and the power output terminal, the surge current always chooses to flow through the surge protection device 100 with relatively small impedance.

[0036] It can be understood that the impedance of the surge protection device 100 under the surge voltage is less than the impedance of the protected device 210 under the surge voltage, and for the normal power supply voltage, the impedance of the surge protection device 100 is larger, so that the normal power supply voltage will not pass through the surge protection device 100. Specifically, you can continue to refer to Figure 1 , and combined with reference Figure 2 When a normal power supply voltage is applied between the power supply input terminal and the power supply output terminal, since the normal power supply voltage does not reach the threshold voltage for the surge channel to be turned on, the surge protection device 100 is disconnected from the normal power supply voltage.

[0037] In some embodiments, the preset condition also includes that the first preset distance is less than the insulation distance of the protected device 210. Referring to the aforementioned embodiment, the insulation distance is the distance between non-contacting conductors in an insulated state. The larger the insulation distance, the greater the threshold voltage for a current path to appear between non-contacting conductors, and the greater the impedance exhibited under the excitation of the same voltage. Therefore, when the first preset distance is less than the insulation distance of the protected device 210, the impedance of the surge protection device 100 under the surge voltage is less than the impedance of the protected device 210 under the surge voltage.

[0038] In some embodiments, please refer to Figure 3 , Figure 3It is a schematic diagram of the framework of the protected device in an embodiment of the present application; the protected device 210 includes a transformer module 213, a filter module 211 and a power control chip 212, and the power input terminal-filter module 211-transformer module 213-power output terminal forms a current path. The preset condition also includes: the first preset distance is less than the insulation distance of the transformer module 213. The specific circuit structure of the transformer module 213, the filter module 211 and the power control chip 212 is a relatively mature technology in the field, and this application will not repeat it. It can be easily understood by those skilled in the art that the transformer module 213 has a primary coil and a secondary coil, and the primary coil and the secondary coil are not electrically connected, but an induced potential is generated by the principle of electromagnetic induction. The primary coil and the secondary coil are not electrically connected, which means that the primary coil and the secondary coil are not connected by a conductor, so that no conductive path is formed between the primary coil and the secondary coil. Since the primary coil and the secondary coil are not electrically connected, the impedance between the primary coil and the secondary coil is large. In other words, under the stimulation of the surge voltage, the surge channel in the surge protection device 100 can be broken down to form a current channel for the surge current to flow, thereby showing a smaller impedance under the stimulation of the surge voltage; while the primary coil and the secondary coil of the transformer module 213 in the protected device 210 are still insulated, thereby showing a larger impedance under the stimulation of the surge voltage. Under the stimulation of the normal power supply voltage, the surge channel in the surge protection device 100 cannot be broken down, and the surge protection device 100 now shows a larger impedance, and the protected device 210 works normally under the stimulation of the normal power supply voltage.

[0039] In some embodiments, the preset condition also includes that the first preset distance is less than the breakdown distance of the surge voltage. When the first preset distance of the surge protection device 100 is less than the breakdown distance of the surge voltage, the surge protection device 100 can be turned on when a surge voltage is applied to both ends of the surge protection device 100; when the first preset distance of the surge protection device 100 is greater than the breakdown distance of the surge voltage, the surge protection device 100 cannot be turned on when a surge voltage is applied to both ends of the surge protection device 100. Therefore, when the first preset distance is less than the breakdown distance of the surge voltage, the surge protection device 100 can be turned on under the excitation of the surge voltage to achieve the effect of discharging the surge voltage. Generally, for every 1KV increase in surge voltage, the breakdown distance increases by 2mm; for example, the breakdown distance of a 1KV surge voltage is 2mm; the breakdown distance of a 2KV surge voltage is 4mm, and so on.

[0040] It is understandable that the breakdown distance of the surge voltage is usually greater than the insulation distance of the transformer module 213 , so when the first preset distance is less than the insulation distance of the transformer module 213 , the first preset distance will be less than the breakdown distance of the surge voltage.

[0041] In some embodiments, in order to ensure that the first preset distance of the surge protection device 100 is smaller than the insulation distance of the transformer module 213, a 20% margin can be reserved, that is, the first preset distance of the surge protection device 100 can be 20% smaller than the insulation distance of the transformer module 213, for example, set to 8 mm.

[0042] The second aspect of the present application provides a surge protection device 400. Figure 4 , Figure 4 It is a schematic diagram of the framework of an embodiment of the surge protection device of the present application. The surge protection device 400 includes an input end, a first protection module 410, an output end, and the surge protection device 100 in the first aspect described above; the input end is used to connect to the protected device 210; the first end of the first protection module 410 is connected to the input end, and the second end is connected to the protective grounding terminal PE; the output end is connected to the grounding terminal, and the output end is also used to connect to the protected device 210; one electrode 110 of the surge protection device 100 is connected to the third end of the first protection module 410, and the other electrode 110 is connected to the output end; wherein, when a surge voltage is input from the input end, the surge voltage is discharged to the protective grounding terminal PE and the grounding terminal through the first protection module 410 and the surge protection device 100 in sequence.

[0043] In the above scheme, by connecting the first protection module 410 and the surge protection device 100 to the protected device 210, when a surge voltage is generated, the surge voltage can be timely discharged from the first protection module 410 and the surge protection device 100. By providing at least one conductive protrusion 111 on the electrodes 110 disposed oppositely of the surge protection device 100, when a surge voltage is applied to the electrodes 110 disposed oppositely, the surge channel can be more easily conducted, and at the same time, the impedance of the surge protection device 100 is made smaller than the impedance of the protected device 210, so that the first preset distance can be greater than the preset safety distance, and when a surge voltage appears at both ends of the electrode 110, the surge voltage can be discharged in time, so that the surge voltage can be effectively discharged while meeting the safety requirements.

[0044] The first protection module 410 may refer to other surge protection modules in the art, and the present application does not limit the specific structure of the first protection module 410 .

[0045] Referring to the description in the aforementioned embodiment of the surge protection device 100 , when a surge voltage is applied between the input terminal and the output terminal, the surge protection device 100 is turned on under the excitation of the surge voltage, thereby presenting a low impedance to the surge voltage. Therefore, the surge voltage can be discharged through the surge protection device 100 without affecting the protected device 210 .

[0046] The first protection module 410 has a first terminal connected to the input terminal and a second terminal connected to the protective ground terminal PE, and can discharge part of the surge voltage to the protective ground terminal PE. It should be understood that the protective ground terminal PE and the output terminal are two different terminals.

[0047] In some embodiments, please refer to Figure 5 , Figure 5 It is a schematic diagram of the framework of another embodiment of the surge protection device of the present application; the surge protection device 400 also includes a regulating module 420, one end of the regulating module 420 is connected to the third end of the first protection module 410, and the other end is connected to the output end for absorbing surge voltage.

[0048] In some embodiments, the regulating circuit includes a combination of a capacitor and a resistor, such as a capacitor and a resistor connected in series, so as to reduce the residual surge voltage after being discharged by the first protection module 410, absorb part of the surge voltage, and improve the electromagnetic compatibility performance of the surge protection device 400.

[0049] In some embodiments, for different usage scenarios, such as the L / N two-wire usage scenario, the regulating module 420 may not be connected in parallel at both ends of the surge protection device 100. For the L / N / PE three-wire usage scenario, the regulating module 420 may be connected in parallel at both ends of the surge protection device 100.

[0050] In some embodiments, please refer to Figure 6 , Figure 6 It is a schematic diagram of the framework of an embodiment of the surge protection system of the present application.

[0051] The surge protection system 600 includes a protected device 210, a surge protection device 400 in any embodiment of the second aspect, a power input end and a power output end, wherein the power input end is respectively connected to the protected device 210 and the input end of the surge protection device 400; the power output end is respectively connected to the protected device 210 and the output end of the surge protection device 400; wherein, when a surge voltage is input from the power input end, the surge voltage flows to the power output end through the surge protection device 400.

[0052] In the above scheme, by connecting the first protection module 410 and the surge protection device 100 to the protected device 210, when a surge voltage is generated, the surge voltage can be timely discharged from the first protection module 410 and the surge protection device 100. By providing at least one conductive protrusion 111 on the electrodes 110 disposed oppositely of the surge protection device 100, when a surge voltage is applied to the electrodes 110 disposed oppositely, the surge channel can be more easily conducted, and at the same time, the impedance of the surge protection device 100 is made smaller than the impedance of the protected device 210, so that the first preset distance can be greater than the preset safety distance, and when a surge voltage appears at both ends of the electrode 110, the surge voltage can be discharged in time, so that the surge voltage can be effectively discharged while meeting the safety requirements.

[0053] In some embodiments, the protected device 210 may include a power control chip 212, a filter module 211, a transformer module 213, etc. in a camera device.

[0054] It is easy for a person skilled in the art to know that many modifications and changes can be made to the device and method while maintaining the teaching content of the present application. Therefore, the above disclosure should be considered as limited only by the scope of the appended claims.

Claims

1. A surge protection device, used in a surge protection device to prevent surge voltage from entering the protected device, characterized in that: The surge protection device comprises: Oppositely disposed electrodes, each of the oppositely disposed electrodes having at least one conductive protrusion on its opposite surface, the conductive protrusion being configured to extend in a direction close to the conductive protrusion on the opposite electrode; An insulating component is arranged between the electrodes arranged opposite to each other and surrounds a surge channel; wherein, under the excitation of the surge voltage, the surge channel between the electrodes of the surge protection device is turned on to discharge the surge voltage; The distance between the mutually close tops of the conductive protrusions on the electrode is a first preset distance, the first preset distance meets a preset condition, and the impedance of the surge protection device under the surge voltage is less than the impedance of the protected device under the surge voltage; Wherein, the preset condition includes that the first preset distance is greater than a preset safety distance.

2. The surge protection device according to claim 1, characterized in that: The preset conditions also include: The first preset distance is smaller than the insulation distance of the protected device.

3. The surge protection device according to claim 2, characterized in that: The protected device includes a transformer module; The preset conditions also include: The first preset distance is smaller than the insulation distance of the transformer module.

4. The surge protection device according to claim 1 or 2, characterized in that: The preset conditions also include: The first preset distance is smaller than a breakdown distance of a surge voltage.

5. The surge protection device according to claim 1 or 2, characterized in that: There is a second preset distance between the electrodes that are arranged opposite to each other, and the second preset distance is greater than the preset creepage distance.

6. The surge protection device according to claim 1 or 2, characterized in that: The electrode is a metal plate; The metal plate has a connection terminal and at least one conductive protrusion; When the surge channel between the electrodes arranged opposite to each other is turned on, the conductive protrusion conducts the surge voltage to the connection terminal through the metal plate.

7. The surge protection device according to claim 1, characterized in that: The surge voltage is greater than 5KV.

8. A surge protection device, characterized in that: include: An input terminal, used for connecting to a protected device; A first protection module, a first end of which is connected to the input end, and a second end of which is connected to a protective grounding end; an output terminal connected to the ground terminal, the output terminal being further used to be connected to the protected device; and The surge protection device according to any one of claims 1 to 7, wherein one electrode of the surge protection device is connected to the third end of the first protection module, and the other electrode is connected to the output end; When a surge voltage is input from the input terminal, the surge voltage is discharged to the protective ground terminal and the ground terminal through the first protection module and the surge protection device in sequence.

9. The surge protection device according to claim 8, characterized in that: Also includes: The regulating module has one end connected to the third end of the first protection module and the other end connected to the output end, and is used for absorbing surge voltage.

10. A surge protection system, characterized in that: include: Protected device; The surge protection device according to any one of claims 8 to 9; A power input terminal, connected to the protected device and the input terminal of the surge protection device respectively; A power supply output terminal, connected to the protected device and the output terminal of the surge protection device respectively; When a surge voltage is input from the power input terminal, the surge voltage flows to the power output terminal through the surge protection device.

Images