CN210430915U - DC power supply lightning protection device with overcurrent and overvoltage protection function - Google Patents
DC power supply lightning protection device with overcurrent and overvoltage protection function Download PDFInfo
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- CN210430915U CN210430915U CN201921599000.2U CN201921599000U CN210430915U CN 210430915 U CN210430915 U CN 210430915U CN 201921599000 U CN201921599000 U CN 201921599000U CN 210430915 U CN210430915 U CN 210430915U
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Abstract
The utility model discloses a DC power supply lightning protection device with overcurrent and overvoltage protection functions, which comprises a first voltage dependent resistor and a second voltage dependent resistor, wherein one end of the first voltage dependent resistor is connected with one end of a first temperature control protective tube and one end of a first transient overvoltage protective tube, the other end of the first temperature control protective tube is connected with the anode of a DC power supply, and the other end of the first transient overvoltage protective tube and the other end of the first voltage dependent resistor are both grounded; one end of the second piezoresistor is connected with one end of the second temperature control protective tube and one end of the second transient overvoltage protective tube, the other end of the second temperature control protective tube is connected with the negative electrode of the direct-current power supply, and the other end of the second transient overvoltage protective tube and the other end of the second piezoresistor are both grounded. The utility model discloses a two piezo-resistors are parallelly connected, have improved the system through-flow volume to set up temperature control protective tube and transient overvoltage protection tube, realized the overcurrent and the overvoltage duplicate protection function of device, prolonged the life of DC power supply lightning protection device, guaranteed the safety of system.
Description
Technical Field
The application relates to the technical field of lightning protection devices, in particular to a direct-current power supply lightning protection device with overcurrent and overvoltage protection functions.
Background
Lightning is a special weather phenomenon caused by the discharge of charged clouds in the air. The path of damaging people and buildings by lightning comprises direct lightning stroke and lightning electromagnetic pulse, wherein the direct lightning stroke is expressed as strong lightning current and is protected by a lightning receptor, a down conductor, a grounding device and the like; the lightning electromagnetic pulse is represented by radiation of a magnetic field, inductive surge on a circuit and the like, and can be protected by measures such as shielding, reasonable wiring, installation of a surge protector and the like. Thus, the destructive lightning is one of the important reasons for damaging the electronic equipment, and threatens the safe and stable operation of electronic information systems in various fields such as buildings, railways, civil aviation, communication, industrial control, military and the like.
The lightning protector is an electric device with non-linear element and can protect not only the overvoltage and overcurrent caused by electromagnetic pulse of thunder and lightning, but also the surge generated by line voltage fluctuation and misoperation. When spike current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the lightning protection device can be conducted and shunted within a very short time, so that damage to other equipment in the loop caused by surge is avoided.
The direct current power supply lightning protector can be installed between the positive pole and the negative pole of the direct current power supply or between the positive pole (or the negative pole) and the ground, and can prevent the equipment from being damaged by lightning overvoltage and transient voltage between power lines or between the power lines and the ground.
The working principle of the existing lightning protection device for the direct current power supply is that the nonlinear characteristic of a piezoresistor is utilized, and the piezoresistor usually adopts a zinc oxide valve plate sealed in a porcelain bushing. When the voltage does not fluctuate, the voltage dependent resistor is in a high-resistance state, and when the voltage fluctuates and reaches the starting voltage of the voltage dependent resistor, the voltage dependent resistor is in a low-resistance state quickly, so that the voltage is limited within a certain range.
However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the existing lightning protection device for a direct current power supply at least has the following technical problems:
1. the direct-current power supply lightning protection device has no over-current and over-voltage protection function, is easy to damage under over-current and/or instant high-voltage impact, and has short service life;
2. the flow of the piezoresistor is not ideal, the maximum discharge current of the general piezoresistor is 20KA (8/20uS), and the use requirement of a B-level occasion cannot be met;
3. the residual voltage of the voltage dependent resistor is too high and sometimes exceeds the working voltage of the protected system by more than several times, even reaches more than 2KV, although the time for attaching and acting on the protected equipment is only a few microseconds and is not enough to immediately damage the protected equipment, the frequent action inevitably causes the early progressive damage of the protected equipment, thereby affecting the normal operation of the system.
With the rapid development of large-scale integrated circuit technology, the degree of electronic integration of electronic and electrical systems is higher and higher, and a large number of high-precision and high-sensitivity electronic components are widely applied, and in order to more effectively suppress the damage caused by lightning and various surges, higher requirements are required to be provided for a direct-current power supply lightning protection device.
4. When the surge energy is too big, surpass during piezo-resistor's absorbed power, can burn out piezo-resistor, the direct current power supply arrester loses the guard action this moment, but, direct current power supply arrester's trouble often is difficult for in time to be discover, can suffer destruction by protective apparatus, produces huge loss. Therefore, it is necessary to prevent and warn of burning of the varistor itself.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved is how to protect DC power supply lightning protection device's overcurrent and overvoltage, improves DC power supply lightning protection device's through-flow volume, reduces DC power supply lightning protection device's residual voltage, and then improves AC power supply lightning protection device's life, avoids simultaneously because the protection inefficacy that brings is burnt out of DC power supply lightning protection device's piezo-resistor self.
In order to solve the above technical problem, an embodiment of the present application provides a dc power supply lightning protection device with overcurrent and overvoltage protection functions, where the dc power supply lightning protection device with overcurrent and overvoltage protection functions includes a first voltage dependent resistor and a second voltage dependent resistor, one end of the first voltage dependent resistor is connected to one end of a first temperature control fuse and one end of a first transient overvoltage protection tube, the other end of the first temperature control fuse is connected to a dc power supply positive electrode, and the other end of the first transient overvoltage protection tube and the other end of the first voltage dependent resistor are both grounded; one end of the second piezoresistor is connected with one end of a second temperature control protective tube and one end of a second transient overvoltage protective tube, the other end of the second temperature control protective tube is connected with the negative electrode of the direct-current power supply, and the other end of the second transient overvoltage protective tube and the other end of the second piezoresistor are grounded.
Preferably, a gas discharge tube is connected between the other end of the first transient overvoltage protection tube, the other end of the first piezoresistor, the other end of the second transient overvoltage protection tube, and the other end of the second piezoresistor and the ground.
More preferably, the device further comprises an indicator light, one end of the indicator light is connected with one end of the first voltage dependent resistor, and the other end of the indicator light is connected with one end of the second voltage dependent resistor.
Preferably, the first temperature control protective pipe and the second temperature control protective pipe both comprise fusible alloy modules, fluxing resin is wrapped around the fusible alloy modules, the fusible alloy modules are connected with metal guide sheets, the exterior of the fusible alloy modules wrapped with the fluxing resin is sealed through a plastic shell, and the metal guide sheets are partially exposed out of the plastic shell.
Preferably, the first transient overvoltage protection tube and the second transient overvoltage protection tube are transient voltage suppression diodes.
Preferably, the first varistor and the second varistor have the same specification.
More preferably, a rated reverse turn-off voltage of the first transient overvoltage protection tube is greater than or equal to a maximum working voltage of the first piezoresistor, and a maximum clamping voltage of the first transient overvoltage protection tube is smaller than a breakdown voltage of the first piezoresistor.
More preferably, a rated reverse turn-off voltage of the second overvoltage transient protection tube is greater than or equal to a maximum working voltage of the second varistor, and a maximum clamping voltage of the second overvoltage transient protection tube is smaller than a breakdown voltage of the second varistor.
Preferably, a ceramic sealed housing is provided outside the gas discharge tube.
Further, the diameter of the gas discharge tube is not less than 8 mm.
The application provides a DC power supply lightning protection device with overcurrent and overvoltage protection function, with the temperature control protective tube establish ties in the circuit, the too big temperature that leads to fusible alloy in the electric current in the circuit risees to the level of setting for, fusible alloy will fuse fast to cut off piezo-resistor's outer loop, prevent that piezo-resistor from being burnt.
The DC power supply lightning protector with the over-current and over-voltage protection functions is characterized in that the piezoresistor is connected with the transient over-voltage protection tube in parallel, when two ends of the transient over-voltage protection tube are subjected to transient high-energy impact, the transient over-voltage protection tube can reduce the impedance of the transient over-voltage protection tube suddenly at a very high speed, and simultaneously absorb a large current to clamp the voltage between the two ends of the transient over-voltage protection tube on a preset value, so that the piezoresistor is prevented from being damaged by the transient high-energy impact.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
1. through setting up temperature control protective tube and transient state overvoltage protection tube, realized the overcurrent of device and overvoltage duplicate protection function, prolonged DC power supply lightning protection device's life, ensured the safety of system.
2. The two piezoresistors are connected in parallel, so that the single piezoresistor structure of the traditional direct-current power supply lightning arrester is changed, the two piezoresistors are combined, the flow rate of the piezoresistors is greatly improved, the use requirement of a B-level occasion is met, and the problem of the flow rate of the piezoresistors is fundamentally solved.
3. The residual voltage that two parallelly connected confession of this application of piezo-resistor are less than traditional DC power supply lightning protection device's single piezo-resistor's residual voltage far away, and the residual voltage of the DC power supply lightning protection device that this embodiment provided can be little to by the maximum operating voltage of protection system below 2 times, can guarantee effectively that protected equipment is not damaged, is applicable to extensive, high accuracy, high sensitivity electronic components's lightning protection.
4. The gas discharge tube is used as a discharge channel, the gas discharge tube utilizes gas discharge, the purpose of discharging current at one time is achieved through breakdown of gas, leakage current of the piezoresistor can be effectively blocked, the phenomena of aging, spontaneous combustion and the like caused by leakage current of the single piezoresistor of the traditional direct-current power supply lightning arrester are avoided, and the service life of the direct-current power supply lightning arrester is greatly prolonged.
5. The indicator lamp is added, when the direct-current power supply lightning protection device works normally, the indicator lamp is lighted, after a temperature control protective tube in the direct-current power supply lightning protection device is fused, the indicator lamp is extinguished, a user is reminded of timely maintaining the direct-current power supply lightning protection device or replacing a new direct-current power supply lightning protection device, and the safe use of a protected system is ensured.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Fig. 1 is a schematic structural diagram of a dc power supply lightning protection device with overcurrent and overvoltage protection functions according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a dc power supply lightning protection device with overcurrent and overvoltage protection functions according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a dc power supply lightning protection device with overcurrent and overvoltage protection functions according to embodiment 3 of the present invention;
description of reference numerals:
the overvoltage protection device comprises a first piezoresistor RV1, a second piezoresistor RV2, a first temperature control fuse TF1, a second temperature control fuse TF2, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, a gas discharge tube G and an indicator light L.
Detailed Description
The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Example 1
Fig. 1 is a schematic structural diagram of a dc power supply lightning arrester with overcurrent and overvoltage protection functions provided in this embodiment, where the dc power supply lightning arrester with overcurrent and overvoltage protection functions includes a first voltage dependent resistor RV1, a second voltage dependent resistor RV2, a first temperature control fuse TF1, a second temperature control fuse TF2, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, and the like.
One end of a first piezoresistor RV1 is connected with one end of a first temperature control fuse TF1 and one end of a first transient overvoltage protection tube TVS1, the other end of the first temperature control fuse TF1 is connected with the anode of a direct-current power supply, and the other end of the first transient overvoltage protection tube TVS1 and the other end of the first piezoresistor RV1 are both grounded to PE; one end of a second voltage dependent resistor RV2 is connected with one end of a second temperature control fuse TF2 and one end of a second transient overvoltage protection tube TVS2, the other end of the second temperature control fuse TF2 is connected with the negative electrode of a direct current power supply, and the other end of the second transient overvoltage protection tube TVS2 and the other end of the second voltage dependent resistor RV2 are both grounded PE.
The direct current power supply lightning protection device with the over-current and over-voltage protection function provided by the embodiment adopts the two piezoresistors to be connected in parallel, so that the single piezoresistor structure of the traditional direct current power supply lightning protection device is changed, the two piezoresistors are combined, the flow rate of the piezoresistors is greatly improved, the use requirement of a B-level occasion is met, and the problem of the flow rate of the piezoresistors is fundamentally solved.
Meanwhile, experimental research shows that the residual voltage given by the parallel connection of the two piezoresistors is far less than that of a single piezoresistor. The residual voltage of the direct-current power supply lightning protection device with the over-current and over-voltage protection function can be reduced to be less than 2 times of the maximum working voltage of a protected system, protected equipment can be effectively prevented from being damaged, and the direct-current power supply lightning protection device is suitable for lightning protection of large-scale, high-precision and high-sensitivity electronic components.
In this embodiment, two voltage dependent resistors are connected in series with a temperature control fuse, respectively. The temperature control protective tube adopts fusible alloy, fluxing resin is wrapped around the fusible alloy, and the fusible alloy is connected with the metal guide sheet and sealed by plastic materials. The temperature control protective tube is connected in series in the circuit, when the temperature of the fusible alloy is increased to a set level due to overlarge current in the circuit, the fusible alloy can be quickly fused, so that an external loop of the piezoresistor is cut off, and the piezoresistor is prevented from being burnt.
In this embodiment, the two piezoresistors are further connected in parallel with one transient overvoltage protection tube respectively. The transient overvoltage protection tube adopts transient VOLTAGE suppression diode TVS (transient VOLTAGE suppressor), when two ends of the TVS tube are subjected to transient high-energy impact, the transient overvoltage protection tube can enable the impedance of the TVS tube to be suddenly reduced at an extremely high speed, and simultaneously absorb a large current to clamp the VOLTAGE between the two ends of the TVS tube to a preset value, thereby ensuring that the piezoresistor is prevented from being damaged by the transient high-energy impact.
The DC power supply lightning protection device with the over-current and over-voltage protection function provided by the embodiment can perform the over-current and over-voltage dual protection function through the arrangement of the temperature control protective tube and the transient over-voltage protective tube, thereby prolonging the service life of the DC power supply lightning protection device and ensuring the safety of the system.
In this embodiment, the voltage values of the first voltage dependent resistor RV1 and the second voltage dependent resistor RV2 are selected according to the following table:
the first voltage dependent resistor RV1 and the second voltage dependent resistor RV2 are selected to have the same voltage value.
In this embodiment, the specification of the temperature control fuse tube should be selected according to the actual working condition, and it should be noted that the temperature control fuse tube should have good thermal coupling characteristics with the piezoresistor.
In this embodiment, the specification of the transient overvoltage protection tube should be selected according to the actual working condition, and the maximum dc or continuous working voltage of the varistor of the protected circuit, the rated standard voltage of the circuit, and the "high-end" tolerance are determined during selection: the rated reverse turn-off voltage VWM of the transient overvoltage protection tube is larger than or equal to the maximum working voltage of the protected circuit. The maximum clamping voltage VC of the transient overvoltage protection tube is less than the damage voltage of the protected circuit. After the maximum clamping voltage is determined, the peak pulse current of the transient overvoltage protection tube is larger than the transient surge current.
Example 2
Fig. 2 is a schematic structural diagram of a dc power lightning arrester with overcurrent and overvoltage protection functions provided in this embodiment, where the dc power lightning arrester with overcurrent and overvoltage protection functions includes a first voltage dependent resistor RV1, a second voltage dependent resistor RV2, a first temperature control fuse TF1, a second temperature control fuse TF2, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, and a gas discharge tube G.
One end of a first piezoresistor RV1 is connected with one end of a first temperature control fuse TF1 and one end of a first transient overvoltage protection tube TVS1, the other end of the first temperature control fuse TF1 is connected with the anode of a direct-current power supply, and the other end of the first transient overvoltage protection tube TVS1 and the other end of the first piezoresistor RV1 are both connected with one end of a gas discharge tube G; one end of a second voltage dependent resistor RV2 is connected with one end of a second temperature control fuse TF2 and one end of a second transient overvoltage protection tube TVS2, the other end of the second temperature control fuse TF2 is connected with the negative electrode of a direct-current power supply, the other end of the second transient overvoltage protection tube TVS2 and the other end of the second voltage dependent resistor RV2 are both connected with one end of a gas discharge tube G, and the other end of the gas discharge tube G is grounded by PE.
The dc power supply lightning protection device with overcurrent and overvoltage protection provided by this embodiment adds a gas discharge tube G on the basis of embodiment 1. Meanwhile, a gas discharge tube G is used as a discharge channel, and the gas discharge tube G discharges gas to play a role in discharging current at one time by breaking down the gas. The gas discharge tube G is added, so that the leakage current of the piezoresistor can be effectively blocked, the phenomena of aging, spontaneous combustion and the like of the single piezoresistor (zinc oxide valve plate) caused by leakage current are avoided, and the service life of the piezoresistor is greatly prolonged.
In this embodiment, the gas discharge tube G is hermetically sealed and sealed with ceramic, and the diameter of the gas discharge tube G is 8mm or more.
Example 3
Fig. 3 is a schematic structural diagram of a dc power lightning arrester with overcurrent and overvoltage protection functions provided in this embodiment, where the dc power lightning arrester with overcurrent and overvoltage protection functions includes a first voltage dependent resistor RV1, a second voltage dependent resistor RV2, a first temperature control fuse TF1, a second temperature control fuse TF2, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, a gas discharge tube G, and an indicator light L.
One end of a first piezoresistor RV1 is connected with one end of a first temperature control fuse TF1, one end of a first transient overvoltage protection tube TVS1 and one end of an indicator lamp L, the other end of the first temperature control fuse TF1 is connected with the anode of a direct-current power supply, and the other end of the first transient overvoltage protection tube TVS1 and the other end of the first piezoresistor RV1 are both connected with one end of a gas discharge tube G; one end of a second voltage dependent resistor RV2 is connected with one end of a second temperature control fuse TF2, one end of a second transient overvoltage protection tube TVS2 and the other end of the indicator lamp L, the other end of the second temperature control fuse TF2 is connected with the negative electrode of the direct-current power supply, the other end of the second transient overvoltage protection tube TVS2 and the other end of the second voltage dependent resistor RV2 are connected with one end of a gas discharge tube G, and the other end of the gas discharge tube G is grounded by PE.
The lightning protection device for a dc power supply with over-current and over-voltage protection function provided by this embodiment is added with an indicator light L on the basis of embodiment 2. When the direct current power supply lightning protection device normally works, the indicating lamp L is turned on, and after the first temperature control protective tube TF1 or the second temperature control protective tube TF2 in the direct current power supply lightning protection device is fused, the indicating lamp L is turned off, so that a user is reminded to timely maintain the direct current power supply lightning protection device or replace a new direct current power supply lightning protection device, and the safety of a protected system is ensured.
It should be understood that although the quantitative terms "first", "second", etc. may be used to describe various elements in the above embodiments, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the method of the present invention, and such modifications and additions are also considered to be within the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (10)
1. A DC power supply lightning protector with overcurrent and overvoltage protection functions is characterized in that: the overvoltage protection circuit comprises a first piezoresistor (RV1) and a second piezoresistor (RV2), wherein one end of the first piezoresistor (RV1) is connected with one end of a first temperature control fuse (TF1) and one end of a first transient overvoltage protection tube (TVS1), the other end of the first temperature control fuse (TF1) is connected with a direct-current power supply anode, and the other end of the first transient overvoltage protection tube (TVS1) and the other end of the first piezoresistor (RV1) are grounded; second temperature control protective tube (TF2) one end and second transient overvoltage protection tube (TVS2) one end are connected to second piezo-resistor (RV2) one end, DC power supply negative pole is connected to second temperature control protective tube (TF2) other end, second transient overvoltage protection tube (TVS2) the other end with second piezo-resistor (RV2) other end all grounds.
2. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 1, wherein: and a gas discharge tube (G) is connected between the other end of the first transient overvoltage protection tube (TVS1), the other end of the first piezoresistor (RV1), the other end of the second transient overvoltage protection tube (TVS2), the other end of the second piezoresistor (RV2) and the ground.
3. A lightning protector for dc power supply with overcurrent and overvoltage protection as claimed in claim 1 or 2, wherein: still include pilot lamp (L), the one end of pilot lamp (L) is connected first piezo-resistor (RV1) one end, the other end of pilot lamp (L) is connected second piezo-resistor (RV2) one end.
4. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 1, wherein: the first temperature control protective pipe (TF1) and the second temperature control protective pipe (TF2) both comprise fusible alloy modules, fluxing resin is wrapped around the fusible alloy modules, the fusible alloy modules are connected with metal guide pieces, the fusible alloy modules wrapped with the fluxing resin are sealed through plastic shells, and the metal guide pieces are partially exposed outside the plastic shells.
5. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 1, wherein: the first transient overvoltage protection tube (TVS1) and the second transient overvoltage protection tube (TVS2) are transient voltage suppression diodes.
6. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 1, wherein: the first piezoresistor (RV1) and the second piezoresistor (RV2) are equal in specification.
7. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 5, wherein: the rated reverse turn-off voltage of the first transient overvoltage protection tube (TVS1) is greater than or equal to the maximum working voltage of the first piezoresistor (RV1), and the maximum clamping voltage of the first transient overvoltage protection tube (TVS1) is less than the damage voltage of the first piezoresistor (RV 1).
8. The lightning protection device for dc power supply with over-current and over-voltage protection function as claimed in claim 5, wherein the rated reverse turn-off voltage of the second overvoltage transient protection tube (TVS2) is greater than or equal to the maximum working voltage of the second varistor (RV2), and the maximum clamping voltage of the second overvoltage transient protection tube (TVS2) is less than the breakdown voltage of the second varistor (RV 2).
9. A lightning protector for dc power supply with overcurrent and overvoltage protection as set forth in claim 2, wherein: and a ceramic sealing shell is arranged outside the gas discharge tube (G).
10. A lightning protector for dc power supply with overcurrent and overvoltage protection as claimed in claim 2 or 9 wherein: the diameter of the gas discharge tube (G) is not less than 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921599000.2U CN210430915U (en) | 2019-09-25 | 2019-09-25 | DC power supply lightning protection device with overcurrent and overvoltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921599000.2U CN210430915U (en) | 2019-09-25 | 2019-09-25 | DC power supply lightning protection device with overcurrent and overvoltage protection function |
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| Publication Number | Publication Date |
|---|---|
| CN210430915U true CN210430915U (en) | 2020-04-28 |
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| CN201921599000.2U Active CN210430915U (en) | 2019-09-25 | 2019-09-25 | DC power supply lightning protection device with overcurrent and overvoltage protection function |
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- 2019-09-25 CN CN201921599000.2U patent/CN210430915U/en active Active
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