CN216774282U

CN216774282U - LED lightning protection device with thermal release port

Info

Publication number: CN216774282U
Application number: CN202123115344.1U
Authority: CN
Inventors: 上亚红; 王月茜; 周聪丽; 李特
Original assignee: Xi'an Xiwuer Electronic & Info Co ltd
Current assignee: Xi'an Xiwuer Electronic & Info Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-06-17
Anticipated expiration: 2031-12-10

Abstract

The utility model belongs to the technical field of lightning protection, and particularly relates to an LED lightning protection device with a thermal release port, which comprises a circuit board, wherein the circuit board comprises: a voltage dependent resistor; the hot melting device is closely attached to the surface of the piezoresistor in a series connection mode, and a hot melting wire is arranged on the hot melting device; a discharge tube connected in series with the varistor. The utility model provides an LED lightning protection device with a thermal release port, which solves the problems of high residual voltage, no thermal release port, no power-off indication function and the like of a conventional piezoresistor device.

Description

LED lightning protection device with thermal release port

Technical Field

The utility model belongs to the technical field of lightning protection, and particularly relates to an LED lightning protection device with a thermal release port.

Background

Lightning has strong destructiveness and mainly comprises four forms of direct lightning strike, lightning induction, lightning wave invasion and ground potential counterattack. The damage capability of the inductive thunder and the voltage counterattack to the equipment is strongest. Lightning stroke or overvoltage enters the electrical equipment along various power supply circuits on the electrical equipment, so that the local part of the electrical equipment is instantaneously damaged, the whole equipment is damaged, even the equipment touches personal safety when the equipment is serious, the damage is eye striking and heart striking, and indirect loss is generally far greater than direct economic loss, so that the lightning protector plays an increasingly important role. The lightning protector is used for preventing equipment from being damaged by lightning stroke by modern electricity and other technologies, and main elements are a zinc oxide piezoresistor and a gas discharge tube. When the lightning protection device works, lightning stroke current is directly led into the ground, equipment is prevented from being struck by lightning or from being subjected to overvoltage, and the effect of protecting the equipment is achieved. The advantage is that product simple structure connects and simple to operate. The disadvantage is that the surge protector is not disconnected from the power supply and the alarm indication is not effective when a lightning strike is encountered.

With the continuous development of the LED technology, the LED has the advantages of low power consumption, long service life, high reaction speed, small volume and no pollution, the application amount of the LED is more and more in the world. LEDs are installed outdoors and are a very big threat to thunderstorm weather, lightning strikes or overvoltage counterattacks. Fire or casualties may be caused when a strong lightning current is encountered. The LED circuit generally adopts overvoltage protection of a piezoresistor device, and has the main problems of no power indication function, no hot junction removal function, high residual voltage and high requirement on the voltage withstanding level of a rear-stage electronic circuit device. With the further development of LED technology, the overcurrent protection for the rear-stage line is higher and higher. Under the condition of the same through-flow of 20kA (8/20), when a pressure-sensitive device is used for protection, the residual voltage is relatively high, the parameter value is between 1800 and 2000V, the thermal outlet protection function is not provided, when the lightning protection component fails due to the heating caused by the invasion of thunder and lightning, the performance of the device is degraded, the internal resistance value is reduced, the device bursts or fires and burns other abnormal phenomena can be caused, and the normal work of the circuit is seriously influenced.

In order to solve the problems, the utility model adopts the LED lightning protection device with the thermal release port.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.

It is still another object of the present invention to provide an LED lightning protection device with a thermal trip, which avoids the problems of high residual voltage, no thermal trip, no power off indication function, etc. of the conventional varistor device.

To achieve these objects and other advantages in accordance with the purpose of the utility model, there is provided an LED lightning protector with a thermal trip, including a wiring board including:

a voltage dependent resistor;

the hot melting device is closely attached to the surface of the piezoresistor in a series connection mode, and a hot melting wire is arranged on the hot melting device;

a discharge tube connected in series with the varistor.

Preferably, the hot melter comprises a hot melting electrode, openings are formed in two ends of the hot melting electrode, the hot melting wire is connected with the hot melting electrode through the through hole, and the through hole is welded by an alloy fuse wire.

Preferably, the discharge tube further comprises a light emitting diode and a resistor, wherein one end of the light emitting diode is connected with the piezoresistor, the other end of the light emitting diode is connected with one end of the resistor, the other end of the resistor is connected with one end of the diode, and the other end of the diode is connected to the joint of the piezoresistor and the discharge tube.

Preferably, the circuit board is provided with an input power line and an output power line, and the lightning protection device is connected with the protected electrical appliance through the input power line and the output power line.

Preferably, the circuit board is arranged on the base, the circuit board is positioned in the shell, and the shell is connected with the base;

and the shell is internally encapsulated with silicon rubber in a potting mode and completely wraps the circuit board.

Preferably, the input power line comprises a first live wire input end, a first zero line input end and a first ground end, and the output power line comprises a second live wire output end, a second zero line output end and a second ground end;

the lightning protection device is connected with a protected electric appliance through the first live wire input end, the first zero line input end, the first grounding end, the second live wire output end, the second zero line output end and the second grounding end.

The utility model at least comprises the following beneficial effects:

1. the LED lightning protection device with the thermal release port provided by the utility model has an ingenious and compact structure and is suitable for electronic equipment such as miniaturization, integration, intellectualization and the like.

2. The LED lightning protector with the thermal release port is used for protecting the rear-stage components on the circuit from being damaged by lightning or overcurrent.

3. According to the LED lightning protector with the thermal release port, the piezoresistor with the thermal release port is connected with the discharge tube in series, so that the residual voltage of the LED lightning protector can be reduced while lightning is prevented.

4. The LED lightning protection device with the thermal release port provided by the utility model adopts the silicon rubber filled and sealed inside and the shell is totally closed, so that the effect of isolating air and moisture can be achieved.

5. The LED lightning protection device with the thermal release port has the advantages of strong lightning protection capability, high response speed, high protection level and the like.

Drawings

FIG. 1 is a schematic circuit diagram of the wiring board of the present invention;

FIG. 2 is a schematic view of the construction of the hot melt apparatus of the present invention;

FIG. 3 is a schematic view of the structure inside the lightning protector according to the utility model;

FIG. 4 is a schematic view of the external structure of the lightning protection device of the present invention;

FIG. 5 is a schematic structural view of the housing of the present invention;

FIG. 6 is a schematic view of the base of the present invention;

FIG. 7 is a schematic diagram of the configuration of the input power line and the output power line according to the present invention;

the LED thermal FUSE comprises a FUSE-thermal FUSE, an MOV-piezoresistor, a GDT-discharge tube, an LED-light emitting diode, a D-diode, an R-resistor, a 1-shell, a 2-base, a 3-circuit board, a 4-thermal FUSE, a 5-input power line, a 6-output power line, a 5-1-first live wire input end, a 5-2-first zero line input end, a 5-3-first grounding end, a 6-1-second live wire output end, a 6-2-second zero line output end, a 6-3-second grounding end, a 7-1-thermal FUSE electrode left end, a 7-2-thermal FUSE electrode right end, an 8-hole and a 9-thermal FUSE.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.

In the present specification, when an element is referred to as being "connected to" or coupled to "or" disposed in "another element, it may be" directly connected to "or coupled to" or "directly disposed in" the other element. Or be connected or coupled to or disposed in another element with other elements interposed therebetween, unless it is volumetrically "directly coupled or connected to" or "directly disposed in" the other element. Further, it will be understood that when an element is referred to as being "on," "over," "under" or "under" another element, it can be "in direct" contact with the other element or in contact with the other element interposed therebetween, unless it is referred to as being in direct contact with the other element.

The utility model provides an LED lightning protection device with a thermal release port, which comprises a circuit board 3, wherein as shown in figure 1, the circuit board 3 comprises:

a voltage dependent resistor;

a hot melting device 9 closely attached to the surface of the piezoresistor in series, wherein a hot melting wire 4 is arranged on the hot melting device 9;

a discharge tube connected in series with the varistor;

the piezoresistor, the hot melting device and the discharge tube are respectively welded on a circuit board to form an internal circuit of the lightning protection device.

The utility model adopts the technology that the piezoresistor with the heat container is connected in series with the discharge tube, and the piezoresistor almost has no leakage current flowing through due to the isolation effect of the discharge tube, so the aging phenomenon of the piezoresistor caused by the leakage current flowing through the piezoresistor for a long time is greatly slowed down by the combination, and meanwhile, the reference voltage of the piezoresistor can be selected to be lower on the premise of ensuring to reliably cut off the power frequency follow current of the gas discharge tube, so that the residual voltage of the piezoresistor is reduced.

On the basis of the above situation, in another embodiment, as shown in fig. 2, the thermal melter includes a left thermal electrode 7-1 and a right thermal electrode 7-2, openings 8 are provided at two ends of the left thermal electrode 7-1 and the right thermal electrode 7-2, the thermal fuse 4 is connected with the thermal fuse 7 through the through hole 8, and the through hole 8 is welded firmly by using an alloy fuse.

The utility model installs a thermal trip alarm structure in the lightning protector, the main principle of the thermal trip is that when the voltage dependent resistor in the lightning protector is degraded or transient overcurrent exceeding the bearing capacity of the product appears in the circuit, the voltage dependent resistor rapidly heats up to melt the trip welding point (welding point of alloy fuse welding) and cause the melting of the thermal fuse, thereby leading the lightning protector with fault to throw away the power grid and the protected equipment without being influenced. The lightning protection device alarming structure gives a signal, so that power transmission line patrol personnel can be reminded to periodically prevent and check the lightning protection device with quality problems, resources are saved, efficiency is improved, equipment failure probability is reduced, and reliability of protected equipment is enhanced.

As shown in fig. 1, one end of the light emitting diode is connected to the voltage dependent resistor, the other end of the light emitting diode is connected to one end of the diode, the other end of the diode is connected to one end of the resistor, the other end of the resistor is connected to one end of the light emitting diode, and the other end of the light emitting diode is connected to a connection between the voltage dependent resistor and the discharge tube. And similarly, the light emitting diode, the diode and the resistor are respectively welded on the circuit board.

The circuit board is welded with a group of alarm indicating elements, the light-emitting diode, the resistor and the hot melting device are connected in series, and when the lightning protection device works normally in the circuit, the light-emitting diode is on, so that the normal work of the circuit is not influenced; when the lightning protection device causes the lightning protection device to have problems due to lightning stroke overcurrent, the heat accumulated by the assembly causes the disconnection of the thermal fuse, the light-emitting diode lamp is turned off, and the rear equipment is separated from the power circuit, so that the rear equipment is effectively protected.

Specifically, as shown in fig. 3, an input power line 5 and an output power line 6 are arranged on the circuit board 3, and the lightning protection device is connected to the protected electrical appliance through the input power line 5 and the output power line 6.

Specifically, as shown in fig. 7, the input power line 5 includes a first live wire input end 5-1, a first zero line input end 5-2, and a first ground end 5-3, and the output power line 6 includes a second live wire output end 6-1, a second zero line output end 6-2, and a second ground end 6-3;

specifically, the lightning protection device is connected with a protected electrical appliance through the first live wire input end 5-1, the first zero line input end 5-2, the grounding end 5-3, the second live wire output end 6-1, the second zero line output end 6-2 and the second grounding end 6-3. When the lightning protection device normally works in the circuit, the light emitting diode lamp is on, the normal work of the circuit is not influenced, when the lightning protection assembly causes the performance degradation of the lightning protection assembly due to lightning stroke overcurrent, the heat accumulated by the assembly causes the disconnection of the thermal fuse, the light emitting diode lamp is turned off, the rear equipment is separated from the power circuit, and the rear equipment is effectively protected.

When the power supply lead is connected in series, the first live wire input end 5-1 of the power supply lead is connected to the live wire input end, and the second live wire output end 6-1 of the plug terminal is used as the output end and is connected with the live wire end of the protected electric appliance. In the same way, a first zero line input end 5-2 serving as a power supply lead is connected to the zero line input end, a second zero line output end 6-2 serving as the power supply lead is connected to the zero line end of the protected electric appliance as the output end, a first grounding end 5-3 serving as the power supply lead is connected to the zero line input end, and a second grounding end 6-3 serving as the power supply lead is connected to the grounding line end of the protected electric appliance as the output end. When the lightning protection device is completely damaged by extra-large lightning stroke or overvoltage, the power supply can be automatically cut off and lightning stroke current can be blocked, so that the electrical equipment can not be damaged by lightning stroke. The project realizes the protection of equipment during lightning stroke or overvoltage voltage, and ensures the normal operation of the equipment; strong lightning stroke resistance, high processing speed, high protection level and the like.

On the basis of the above embodiments, as shown in fig. 4, 5 and 6, another embodiment further includes a housing 1 and a base 2, the circuit board 3 is disposed on the base 2, the circuit board 3 is located inside the housing 1, and the housing 1 is connected to the base 2;

wherein, the shell 1 is encapsulated by silicon rubber and completely wraps the circuit board 3. The insulation distance between each device is ensured. In addition, the silicon rubber is encapsulated in the device body and the shell is totally closed, so that the device can isolate the action of air and moisture, and the bearing capacity and the anti-interference capacity of the device are obviously improved through fire prevention, water prevention and dust prevention.

As shown in fig. 5, the product can be fixed in the box of the LED power circuit by screws, and the four corners of the housing of the product are provided with fixing holes, so that the product can be fixed in the protected device by screws.

In addition, the technical parameters of the lightning protection device provided by the utility model are as follows: maximum continuous operating voltage Uc: 320 VDC; rated discharge current In (8/20) 20 kA; protection level Up: below 1500V; of course, according to other application conditions, the technical parameters can be adjusted according to the application scenes.

The lightning protector provided by the utility model is serially arranged in an LED power circuit, and normally, the normal work of the circuit is not influenced. The lightning protector releases huge pulse energy generated by lightning strike or overvoltage in the circuit to the ground through a grounding route, so that the potential difference of the power supply of the equipment is reduced to play a role in protecting the equipment. If the lightning stroke or the overvoltage exceeds the energy range of the lightning protection device, when the performance of the piezoresistor heating device is degraded and fails, the thermal tripping device acts, the rear equipment is separated from the power supply circuit, and the lightning protection device is separated from the power supply circuit and the alarm indicator lamp is turned off, so that the lightning protection problem of the LED power supply can be effectively solved, and the safe and reliable operation of the power supply system is ensured.

In summary, according to the LED lightning protection device with the thermal relief provided by the utility model, the technology that the piezoresistor with the thermal relief is connected in series with the discharge tube is adopted, and due to the isolation effect of the discharge tube, almost no leakage current flows through the piezoresistor, so that the aging phenomenon of the piezoresistor caused by the leakage current flowing through the piezoresistor for a long time is greatly slowed down by the combination, and meanwhile, on the premise of ensuring reliable cut-off of the power frequency follow current of the gas discharge tube, the reference voltage of the piezoresistor can be selected to be lower, so as to reduce the residual voltage of the piezoresistor. The module is mainly characterized in that: large current, current 8/20 can be made to have a waveform of 20 Ka. The low residual voltage can be lower than 1500V, and the device has a hot junction protection circuit and a power supply indication alarm function, so that a rear-stage electronic circuit is prevented from being damaged by overcurrent.

It is obvious that those skilled in the art can obtain various effects not directly mentioned according to the respective embodiments without trouble from various structures according to the embodiments of the present invention.

While embodiments of the utility model have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the utility model not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims

1. The utility model provides a take LED lightning protection device of heat-release mouth which characterized in that, includes the circuit board, the circuit board includes:

a voltage dependent resistor;

a discharge tube connected in series with the varistor.

2. The LED lightning protection device with the thermal release port according to claim 1, wherein the thermal fuse comprises a thermal melting electrode, openings are formed in two ends of the thermal melting electrode, the thermal fuse is connected with the thermal melting electrode through the openings, and the openings are welded by alloy fuses.

3. The LED lightning protection device with thermal trip according to claim 1, further comprising a light emitting diode and a resistor, wherein one end of the light emitting diode is connected to the varistor, the other end of the light emitting diode is connected to one end of the resistor, the other end of the resistor is connected to one end of the diode, and the other end of the diode is connected to the junction of the varistor and the discharge tube.

4. The LED lightning protection device with the thermal trip port according to any one of claims 1 to 3, wherein an input power line and an output power line are arranged on the circuit board, and the lightning protection device is connected with a protected electric appliance through the input power line and the output power line.

5. The LED lightning protection device with the thermal trip according to claim 4, further comprising a housing and a base, wherein the circuit board is disposed on the base, the circuit board is located inside the housing, and the housing is connected to the base;

6. The LED lightning protection device with the thermal trip port according to claim 4, wherein the input power line comprises a first live input, a first neutral input, and a first ground terminal, and the output power line comprises a second live output, a second neutral output, and a second ground terminal;