Lightning protection device and system

Abstract

The application provides a lightning protection device and system, and relates to the technical field of electrical equipment. The lightning protection device is mainly composed of two-stage lightning protection circuits, a decoupling circuit, a mechanical break point, an electronic solid-state switching device and a control circuit. The number of internal protection devices of the product is reduced, the product size is reduced, the lightning protection design problem of small-size products is effectively solved, most of the lightning strike energy can be bypassed to the bus through the first lightning protection circuit, part of the lightning strike energy can be absorbed through the second lightning protection circuit, and the on-off of the electronic solid-state switching device is controlled by the control circuit, so that permanent damage or damage of the electronic solid-state switching device caused by lightning strike energy is avoided, and the lightning protection requirement of small-size products is met. That is, the lightning protection device provided by the application has the advantages of simple circuit, fewer devices, good lightning protection effect and the like, and solves the problem that the existing lightning protection device is provided with multiple lightning protection circuits, so that the lightning protection requirement of small-size products cannot be met.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more specifically, to a lightning protection device and system. Background Technology

[0002] Lightning protection devices are surge protection components used in common busbar systems.

[0003] Currently, existing lightning protection devices involve installing multi-stage lightning protection circuits at both ends of the output side of electrical equipment using a common busbar system. These multi-stage lightning protection circuits absorb lightning strike energy, reducing the impact of surge voltage on the circuit.

[0004] However, if existing lightning protection devices are still used to absorb lightning energy in the lightning protection design of small-volume products, the product will inevitably be too large and costly, thus failing to meet the lightning protection requirements of small-volume products. Summary of the Invention

[0005] The purpose of this application is to provide a lightning protection device and system to address the shortcomings of the prior art, thereby solving the problem that existing lightning protection devices cannot meet the lightning protection requirements of small-volume products.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a lightning protection device, which consists of a first lightning protection circuit, a second lightning protection circuit, a decoupling circuit, a mechanical breakpoint, an electronic solid-state switching device, and a control circuit.

[0008] One end of the first lightning protection circuit is used to connect to the negative terminal of the busbar, and the other end of the first lightning protection circuit is connected to the other end of the decoupling circuit and one end of the mechanical break point, respectively.

[0009] One end of the second surge protection circuit is used to connect to the negative terminal of the busbar, and the other end of the second surge protection circuit is connected to the second terminal of the electronic solid-state switch and one end of the decoupling circuit, respectively.

[0010] The first terminal of the electronic solid-state switch is used to connect to the negative terminal of the bus, and the third terminal of the electronic solid-state switch is connected to the control circuit.

[0011] The other end of the mechanical break is used to connect a load;

[0012] The control circuit is used to control the on / off state of the electronic solid-state switching device.

[0013] Optionally, the device further includes: a voltage sampling circuit and / or a current sampling circuit;

[0014] The first input terminal of the voltage sampling circuit is used to connect to the positive terminal of the bus, the second input terminal of the voltage sampling circuit is used to connect to the negative terminal of the bus, the output terminal of the voltage sampling circuit is connected to the first input terminal of the control circuit, the voltage sampling circuit is used to sample the voltage of the bus, and output the sampled voltage signal to the control circuit through the output terminal of the voltage sampling circuit;

[0015] The input terminal of the current sampling circuit is used to connect to the negative terminal of the bus, and the output terminal of the current sampling circuit is connected to the second input terminal of the control circuit; the current sampling circuit is used to sample the current of the negative terminal of the bus, and output the sampled current signal to the control circuit through the output terminal of the current sampling circuit.

[0016] The control circuit is used to control the on / off state of the electronic solid-state switching device based on the voltage signal and / or the current signal.

[0017] Optionally, the control circuit includes: a controller, a protection circuit, and a drive circuit;

[0018] The output terminal of the voltage sampling circuit is connected to the first input terminal of the controller and the first input terminal of the protection circuit, respectively.

[0019] The output terminal of the current sampling circuit is connected to the second input terminal of the controller and the second input terminal of the protection circuit, respectively.

[0020] The third input terminal of the controller is connected to the signal terminal of the protection circuit, and the output terminal of the controller is connected to the first input terminal of the drive circuit.

[0021] The output terminal of the protection circuit is connected to the second input terminal of the drive circuit.

[0022] The output terminal of the drive circuit is connected to the electronic solid-state switch device.

[0023] Optionally, the protection circuit is used to output a first control signal to the driving circuit through the output terminal of the protection circuit based on the voltage signal output from the output terminal of the voltage sampling circuit and / or the current signal output from the output terminal of the current sampling circuit, so that the driving circuit controls the electronic solid-state switch device to disconnect according to the first control signal.

[0024] Optionally, the controller is configured to output a second control signal to the drive circuit through the output terminal of the controller based on the voltage signal output from the output terminal of the voltage sampling circuit and / or the current signal output from the output terminal of the current sampling circuit, so that the drive circuit controls the electronic solid-state switch to close according to the second control signal. The controller is also configured to detect whether the protection circuit has been activated based on the feedback signal output from the signal terminal of the protection circuit, report the information, and control the closing / opening of the electronic solid-state switch.

[0025] Optionally, the first lightning protection circuit and the second lightning protection circuit are any of the following: voltage-limiting lightning protection device, switch-type lightning protection device, and hybrid lightning protection device, wherein the hybrid lightning protection device is composed of a combination of the voltage-limiting lightning protection device and the switch-type lightning protection device.

[0026] Optionally, the first surge protection circuit is a switch-type surge protection device, and the second surge protection circuit is a voltage-limiting surge protection device.

[0027] Optionally, the switch-type surge protection device is connected between the negative terminal of the busbar and the mechanical break point.

[0028] Secondly, embodiments of this application also provide a lightning protection system, including: an external system and the lightning protection device described in the first aspect, wherein the external system is connected to a load via the lightning protection device.

[0029] Optionally, the external system includes: a switching power supply module and a surge protection system module;

[0030] One end of the switching power supply module is connected to the positive terminal of the bus, and the other end of the switching power supply module is connected to the negative terminal of the bus.

[0031] One end of the lightning protection system module is connected to the positive terminal of the busbar, and the other end of the lightning protection system module is connected to the negative terminal of the busbar.

[0032] The beneficial effects of this application are:

[0033] This application provides a lightning protection device and system. The lightning protection device mainly consists of a two-stage lightning protection circuit, a decoupling circuit, a mechanical breakpoint, electronic solid-state switching devices, and a control circuit. By reducing the number of internal protective devices and shrinking the product size, it effectively solves the lightning protection design problem of small-volume products. At the same time, it can bypass most of the lightning energy to the busbar through the first lightning protection circuit, absorb part of the lightning energy through the second lightning protection circuit, and control the switching of the electronic solid-state switching devices through the control circuit, thus avoiding permanent damage or destruction of the electronic solid-state switching devices by the lightning energy. This meets the lightning protection requirements of small-volume products. In other words, the lightning protection device provided by this application has the advantages of simple circuit, fewer components, and good lightning protection effect, solving the problem that existing lightning protection devices with multiple stages of lightning protection circuits cannot meet the lightning protection requirements of small-volume products. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 Schematic diagram of the lightning protection device provided in the embodiments of this application Figure 1 ;

[0036] Figure 2 Schematic diagram of the lightning protection device provided in the embodiments of this application Figure 2 ;

[0037] Figure 3 Schematic diagram of the lightning protection device provided in the embodiments of this application Figure 3 ;

[0038] Figure 4 This is a schematic diagram of the lightning protection system provided in an embodiment of this application.

[0039] Icons: 100-Surge protection device; 101-First surge protection circuit; 102-Second surge protection circuit; 103-Decoupling circuit; 104-Mechanical breakpoint; 105-Electronic solid-state switching device; 106-Control circuit; 201-Voltage sampling circuit; 202-Current sampling circuit; 301-Controller; 302-Protection circuit; 303-Drive circuit; 400-Surge protection system; 401-Switching power supply module; 402-Surge protection system module. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that, in the absence of conflict, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and therefore should not be construed as limiting this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] The structure of the lightning protection device provided in this application will be explained in detail through the following multiple embodiments.

[0044] Figure 1 Schematic diagram of the lightning protection device provided in the embodiments of this application Figure 1 ;like Figure 1 As shown, the lightning protection device 100 consists of a first lightning protection circuit 101, a second lightning protection circuit 102, a decoupling circuit 103, a mechanical breakpoint 104, an electronic solid-state switching device 105, and a control circuit 106.

[0045] Continue to refer to Figure 1 As shown, one end of the first surge protection circuit 101 is used to connect to the negative terminal of the busbar, and the other end of the first surge protection circuit 101 is connected to the other end of the decoupling circuit 103 and one end of the mechanical breakpoint 104. The negative input terminal IN- of the surge protection device is connected to the negative terminal of the busbar, and the positive input terminal IN+ of the surge protection device is connected to the positive terminal of the busbar.

[0046] One end of the second surge protection circuit 102 is used to connect to the negative terminal of the busbar, and the other end of the second surge protection circuit 102 is connected to the second terminal of the electronic solid-state switching device 105 and one end of the decoupling circuit 103, respectively.

[0047] The first terminal of the electronic solid-state switch device 105 is used to connect to the negative terminal of the bus, and the third terminal of the electronic solid-state switch device 105 is connected to the control circuit 106.

[0048] The other end of the mechanical breakpoint 104 is used to connect a load. The load can be electrical equipment or electronic equipment, depending on the scenario, and is not limited here.

[0049] The control circuit 106 is used to control the on / off state of the electronic solid-state switching device 105.

[0050] For example, the first surge protection circuit 101 and the second surge protection circuit 102 can be any of the following: a switching surge protection device (such as a ceramic gas discharge tube, a semiconductor discharge tube, etc.), a voltage-limiting surge protection device (such as a varistor, a transient suppression diode, etc.), or a hybrid surge protection device. The hybrid surge protection device is composed of a combination of switching elements and voltage-limiting elements.

[0051] The decoupling circuit 103 can be composed of a decoupling inductor or the like. In this embodiment, the decoupling circuit 103 is placed between the first lightning protection circuit 101 and the second lightning protection circuit 102. The decoupling circuit 103 has high impedance when lightning surge current flows through it, and bypasses the lightning current through the action of the first lightning protection circuit 101 to avoid the impact of the lightning current on the electronic solid-state switching device 105.

[0052] The electronic solid-state switching device 105 may include a power electronic device (PED), also known as a power semiconductor device.

[0053] In this embodiment, when the control circuit 106 is connected, if the load has high lightning protection requirements and space is limited, the first lightning protection circuit 101 can be a gas discharge tube with stronger discharge capability, and the second lightning protection circuit 102 can be a device with faster protection action, such as a transient suppression diode.

[0054] When a lightning strike occurs, the electronic solid-state switch 105 can be controlled to be in the off state by the control circuit 106. The first lightning protection circuit 101 absorbs most of the lightning strike energy using the bypass principle, and a portion of the lightning strike energy is absorbed by the second lightning protection circuit 102. In this way, the impact of the lightning strike on the electronic solid-state switch 105 can be effectively avoided. In addition, a small amount of lightning strike energy can be absorbed by the second lightning protection circuit 102 before the first lightning protection circuit 101 is activated.

[0055] For example, the first surge protection circuit 101 can be a switch-type surge protection device, and the second surge protection circuit 102 can be a voltage-limiting surge protection device, but it is not limited to this and other combinations can also be used.

[0056] Among them, the switch-type surge protection device is connected between the negative terminal of the busbar and the mechanical break point, which can bypass most of the lightning strike energy to protect the electronic solid-state switch device 105.

[0057] Optionally, during a lightning strike, for low-current lightning strikes, the voltage generated by the decoupling circuit 103 is insufficient to ignite or activate the bypass device due to its slow rate of change. Therefore, the electronic solid-state switching device 105 can be protected by the second lightning protection circuit 102.

[0058] In this embodiment, a novel lightning protection scheme for solid-state circuit breakers is formed by the cooperation of a first lightning protection circuit, a second lightning protection circuit, a decoupling circuit, and a control circuit. This reduces the number of internal protective devices and shrinks the product size, effectively solving the lightning protection design problem of small-volume products while meeting the lightning protection requirements of small-volume products.

[0059] Optionally, the lightning protection devices proposed in this application are all placed after the mechanical breakpoint, which makes it easier to conduct breakpoint withstand voltage tests and improves production efficiency compared to existing lightning protection devices.

[0060] The lightning protection device proposed in this application not only has advantages such as good protection effect, strong current carrying capacity, high cost performance and small size, but also has a simplified assembly process, which is more conducive to industrial production and manufacturing.

[0061] In summary, this application provides a lightning protection device, which mainly consists of a two-stage lightning protection circuit, a decoupling circuit, a mechanical break, electronic solid-state switching devices, and a control circuit. This reduces the number of internal protective devices, shrinks the product size, and effectively solves the lightning protection design problem for small-sized products. Furthermore, the first lightning protection circuit bypasses most of the lightning energy to the busbar, while the second lightning protection circuit absorbs some of the lightning energy. The control circuit controls the switching on and off of the electronic solid-state switching devices, preventing permanent damage or destruction to these devices. This meets the lightning protection requirements for small-sized products. In other words, the lightning protection device provided by this application has advantages such as simple circuitry, fewer components, and good lightning protection effect, solving the problem that existing lightning protection devices with multiple stages of lightning protection circuits cannot meet the lightning protection requirements of small-sized products.

[0062] Optionally, refer to Figure 2 As shown, the lightning protection device also includes a voltage sampling circuit 201 and / or a current sampling circuit 202.

[0063] The voltage sampling circuit 201 can be composed of a Hall voltage sensor or a sampling resistor, and the current sampling circuit 202 can be composed of a sampling resistor or a Hall current sensor. In this embodiment, there are no restrictions, as long as the voltage sampling and current sampling functions can be realized.

[0064] Continue to refer to Figure 2 As shown, the first input terminal of the voltage sampling circuit 201 is used to connect to the positive terminal of the bus, the second input terminal of the voltage sampling circuit 201 is used to connect to the negative terminal of the bus, and the output terminal of the voltage sampling circuit 201 is connected to the first input terminal of the control circuit 106. The voltage sampling circuit 201 is used to sample the voltage of the bus and output the sampled voltage signal U to the control circuit through the output terminal of the voltage sampling circuit 201.

[0065] The input terminal of the current sampling circuit 202 is used to connect to the negative terminal of the bus, and the output terminal of the current sampling circuit 202 is connected to the second input terminal of the control circuit 106. The current sampling circuit 202 is used to sample the current of the negative terminal of the bus and output the sampled current signal I to the control circuit 106 through the output terminal of the current sampling circuit 202.

[0066] The control circuit 106 is used to control the on / off state of the electronic solid-state switching device 105 based on the voltage signal U and / or the current signal I.

[0067] Optionally, in this embodiment, the control circuit 106 can determine whether a lightning strike has occurred based on the magnitude of the voltage signal U and / or the current signal I. If so, the control circuit 106 controls the electronic solid-state switch device 105 to be in the off state to avoid the impact of the lightning current on the electronic solid-state switch device, thereby achieving the effect of protecting the electronic solid-state switch device.

[0068] Meanwhile, in standby mode, the electronic solid-state switch 105 is in the off state. If a lightning strike occurs in this state, the control circuit 106 controls the electronic solid-state switch 105 to close briefly to conduct, effectively solving the problem that the lightning protection device cannot cut off the subsequent current when conducting in a DC system.

[0069] Optionally, refer to Figure 3 As shown, the control circuit 106 includes: a controller 301, a protection circuit 302, and a drive circuit 303.

[0070] The controller 301 may be composed of a microprocessor (MCU), and the protection circuit 302 may include a voltage protection circuit and a current protection circuit.

[0071] Continue to refer to Figure 3As shown, the output terminal of the voltage sampling circuit 201 is connected to the first input terminal of the controller 301 and the first input terminal of the protection circuit 302, respectively.

[0072] The output terminal of the current sampling circuit 202 is connected to the second input terminal of the controller 301 and the second input terminal of the protection circuit 302, respectively.

[0073] The third input terminal of the controller 301 is connected to the signal terminal of the protection circuit 302, and the output terminal of the controller 301 is connected to the first input terminal of the drive circuit 303.

[0074] The output terminal of the protection circuit 302 is connected to the second input terminal of the drive circuit 303, and the output terminal of the drive circuit 303 is connected to the electronic solid-state switch device 105.

[0075] In this embodiment, both the controller 301 and the protection circuit 302 can control the on / off state of the electronic solid-state switch device 105 based on the voltage signal collected by the voltage sampling circuit 201 and / or the current signal collected by the current sampling circuit 202.

[0076] Optionally, the protection circuit 302 is used to output a first control signal to the drive circuit 303 through the output terminal of the protection circuit 302 based on the voltage signal U output from the output terminal of the voltage sampling circuit 201 and / or the current signal I output from the output terminal of the current sampling circuit 202, so that the drive circuit 303 controls the electronic solid-state switch device 105 to disconnect according to the first control signal.

[0077] Optionally, the controller 301 is used to output a second control signal to the drive circuit 303 through the output terminal of the controller based on the voltage signal output from the output terminal of the voltage sampling circuit 201 and / or the current signal output from the output terminal of the current sampling circuit 202, so that the drive circuit controls the electronic solid-state switching device to close according to the second control signal.

[0078] Meanwhile, the controller 301 is also used to detect whether the protection circuit 302 is activated based on the feedback signal output from the signal terminal of the protection circuit 302, report the information, and control the closing / opening of the electronic solid-state switching device 105.

[0079] Furthermore, the controller 301 is also used to control the protection circuit 302 to reset based on the feedback signal output from the signal terminal of the protection circuit 302. However, it is not limited to this; the protection circuit 302 can also be reset by other software, hardware, or other means to achieve the reset purpose.

[0080] In this embodiment, when a lightning strike occurs, the protection circuit 302 can determine whether a lightning strike has occurred based on the acquired voltage signal U and / or current signal I. For example, if the protection circuit 302 determines that the acquired voltage signal U is greater than a preset voltage threshold, it can determine that a lightning strike has occurred. The protection circuit 302 responds quickly, for example, with a response action on the order of hundreds of nanoseconds to microseconds, and quickly controls the drive circuit 303 to drive the electronic solid-state switch device 105 to the open state through the first control signal. This allows a small amount of lightning strike energy to be absorbed by the second lightning protection circuit before the first lightning protection circuit activates.

[0081] After a lightning strike, controller 301 determines whether the lightning strike has ended based on the voltage signal monitored by voltage sampling circuit 201 and / or the current signal monitored by current sampling circuit 202. If so, controller 301 controls the drive circuit to keep the electronic solid-state switch 105 in a closed state via a second control signal. Furthermore, controller 301 also controls the protection circuit 302 to reset based on the feedback signal output from the signal terminal of protection circuit 302. For example, controller 301 can determine whether the lightning strike has ended by monitoring the voltage signal monitored by voltage sampling circuit 201 and / or the current signal monitored by current sampling circuit 202 after the lightning strike; this is not a limitation.

[0082] Optionally, both the first surge protection circuit 101 and the second surge protection circuit 102 can be voltage-limiting surge protection devices.

[0083] Optionally, voltage-limiting surge protection devices include: varistors and transient suppression diodes.

[0084] In this embodiment, the need for control circuit intervention in lightning protection can be considered during the lightning protection design based on protection requirements. In the absence of control circuit intervention (i.e., removing...), Figure 1 The lightning protection device after the control circuit (the first lightning protection circuit and the second lightning protection circuit need to select voltage-limiting lightning protection devices with fast lightning protection action (such as varistors and transient suppression diodes). That is, by combining the first lightning protection circuit and the decoupling circuit, the high impedance characteristic of the decoupling circuit when transient current is generated is utilized to generate voltage across the first lightning protection circuit, triggering the first lightning protection circuit to conduct, bypassing the lightning energy to the bus system, and absorbing the lightning energy through the bus lightning protection module.

[0085] Optionally, a second surge protection circuit, composed of voltage-limiting protection devices such as voltage-dependent resistors (VDRs) or transient voltage suppressors (TVS), is connected across the negative terminal of the busbar and the decoupling circuit, and directly in parallel across the electronic solid-state switching device. This utilizes the voltage clamping characteristics of the varistor or transient diode to protect the electronic solid-state switching device.

[0086] If the product has high lightning protection requirements, multiple lightning protection devices can be used in parallel to improve the lightning protection capability of the lightning protection device.

[0087] Optionally, the first surge protection circuit 101 may include a gas discharge tube, such as a ceramic gas discharge tube (GDT) or a semiconductor discharge tube (TSS).

[0088] Among them, the gas discharge tube is a switching type of surge protection device. It utilizes the change from high impedance to low impedance between its two poles during operation to provide surge protection due to its large current carrying capacity. Because of the decoupling circuit, during a high-energy lightning strike, the discharge tube is ignited and conducts, changing from high impedance to low impedance to bypass the energy to the busbar, where it is absorbed by the capacitors in the busbar surge protection module or the switching power supply module.

[0089] After ignition, the gas discharge tube changes from high impedance to low impedance, which can cause a follow current failure in a DC system. By monitoring the electrical signals through voltage sampling circuit 201 and current sampling circuit 202, a lightning strike is detected. After the lightning strike, the electronic solid-state switch is turned on, allowing current to flow through it and bypass the gas discharge tube. Since the gas discharge tube no longer sustains current, it naturally breaks the follow current, thus solving the problem of follow current interruption when using gas discharge tubes in DC systems.

[0090] Optionally, refer to Figure 4 As shown, this application also provides a lightning protection system 400, which includes an external system and a lightning protection device 100 provided in the above embodiments, wherein the external system is connected to the load via the lightning protection device.

[0091] In this embodiment, if the external system is directly connected to the load without a surge protection device, the lightning current will cause damage to the external system and the load during a lightning strike. Therefore, the surge protection device provided in this application can absorb the lightning surge current to protect the external system and the load.

[0092] Optionally, continue to refer to Figure 4 As shown, the external system includes: a switching power supply module 401 and a surge protection system module 402.

[0093] One end of the switching power supply module 401 is connected to the positive terminal of the bus, and the other end of the switching power supply module 401 is connected to the negative terminal of the bus; one end of the surge protection system module 402 is connected to the positive terminal of the bus, and the other end of the surge protection system module 402 is connected to the negative terminal of the bus.

[0094] The switching power supply module 401 provides power to the bus, and one or more solid-state circuit breakers provide power distribution to each branch circuit via a common bus. The switching power supply module contains an output filter capacitor, the power output is connected to the bus, and the filter capacitor from the power supply is connected in parallel on the bus.

[0095] It should be noted that existing surge protection devices place multilayer discharge tubes (MLDs) at the lightning strike inlet (i.e., both ends of the product output side) to absorb lightning energy. During a lightning strike, the capacitors on the busbar exhibit low impedance characteristics, and the surge voltage is absorbed and clamped by the capacitors, resulting in an excessively low surge voltage. This causes the MLDs to operate slowly, and most of the lightning current flows through the electronic solid-state switching devices (SSDs). Therefore, the SSDs must withstand the impact of the lightning current, requiring a higher level of protection against transient lightning currents; otherwise, the lightning current will damage or destroy the SSDs.

[0096] In this embodiment, the external system is connected to the load via a surge protection device. This allows the surge energy to be quickly bypassed to the busbar during a lightning strike by the control circuit, two-stage surge protection circuit, and decoupling circuit in the surge protection device. The energy is then absorbed by the capacitors in the switching power supply module 401 or surge protection system module 402 on the busbar, thereby protecting the electronic solid-state switching devices.

[0097] Optionally, the surge protection device provided in this application is superior to existing surge protection devices and has a wider range of applications. It is more adaptable to power modules where the switching power supply module supplies power to the bus and the output of the switching power supply module has a large filter capacitor.

[0098] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lightning protection device, characterized in that, The first lightning protection circuit, the second lightning protection circuit, the decoupling circuit, the mechanical break point, the electronic solid-state switching device and the control circuit are connected in series. One end of the first lightning protection circuit is connected to the negative pole of the bus, and the other end of the first lightning protection circuit is connected to the other end of the decoupling circuit and one end of the mechanical break point. One end of the second lightning protection circuit is connected to the negative pole of the bus, and the other end of the second lightning protection circuit is connected to the second end of the electronic solid-state switching device and one end of the decoupling circuit. The first end of the electronic solid-state switching device is connected to the negative pole of the bus, and the third end of the electronic solid-state switching device is connected to the control circuit. The other end of the mechanical break point is connected to the load. The control circuit is used for controlling the on-off of the electronic solid-state switching device. The control circuit is also used for controlling the electronic solid-state switching device to be temporarily turned on if a lightning stroke is detected in the standby state.

2. The apparatus of claim 1, wherein, The device further comprises a voltage sampling circuit and / or a current sampling circuit. The first input end of the voltage sampling circuit is connected to the positive pole of the bus, the second input end of the voltage sampling circuit is connected to the negative pole of the bus, the output end of the voltage sampling circuit is connected to the first input end of the control circuit, and the voltage sampling circuit is used for sampling the voltage of the bus and outputting the sampled voltage signal to the control circuit through the output end of the voltage sampling circuit. The input end of the current sampling circuit is connected to the negative pole of the bus, and the output end of the current sampling circuit is connected to the second input end of the control circuit. The current sampling circuit is used for sampling the current of the negative pole of the bus and outputting the sampled current signal to the control circuit through the output end of the current sampling circuit. The control circuit is used for controlling the on-off of the electronic solid-state switching device based on the voltage signal and / or the current signal.

3. The apparatus of claim 2, wherein, The control circuit comprises a controller, a protection circuit and a driving circuit. The output end of the voltage sampling circuit is connected to the first input end of the controller and the first input end of the protection circuit. The output end of the current sampling circuit is connected to the second input end of the controller and the second input end of the protection circuit. The third input end of the controller is connected to the signal end of the protection circuit, and the output end of the controller is connected to the first input end of the driving circuit. The output end of the protection circuit is connected to the second input end of the driving circuit. The output end of the driving circuit is connected to the electronic solid-state switching device.

4. The apparatus of claim 3, wherein, The protection circuit is used for outputting a first control signal to the driving circuit through the output end of the protection circuit according to the voltage signal output by the output end of the voltage sampling circuit and / or the current signal output by the output end of the current sampling circuit, so that the driving circuit controls the electronic solid-state switching device to be disconnected according to the first control signal.

5. The apparatus of claim 3, wherein, The controller is configured to output a second control signal to the drive circuit through an output end of the controller according to a voltage signal output by an output end of the voltage sampling circuit and / or a current signal output by an output end of the current sampling circuit, so that the drive circuit controls the electronic solid-state switching device to be closed according to the second control signal, and the controller is further configured to detect whether the protection circuit is actuated according to a feedback signal output by a signal end of the protection circuit, report information and control the electronic solid-state switching device to be closed / opened.

6. The apparatus of claim 1, wherein, The first lightning protection circuit and the second lightning protection circuit are any one of the following: a voltage limiting lightning protection device, a switch type lightning protection device, and a hybrid lightning protection device, wherein the hybrid lightning protection device is composed of the voltage limiting lightning protection device and the switch type lightning protection device.

7. The apparatus of claim 6, wherein, The first lightning protection circuit is the switch type lightning protection device, and the second lightning protection circuit is the voltage limiting lightning protection device.

8. The apparatus of claim 7, wherein, The switch type lightning protection device is connected in parallel between the negative pole of the bus and the mechanical break point.

9. A lightning protection system, characterized in that, The lightning protection device comprises an external system and the lightning protection device according to any one of claims 1-8, and the external system is connected to a load via the lightning protection device.

10. The system of claim 9, wherein, The external system comprises a switching power supply module and a lightning protection system module. One end of the switching power supply module is connected to the positive pole of the bus, and the other end of the switching power supply module is connected to the negative pole of the bus. One end of the lightning protection system module is connected to the positive pole of the bus, and the other end of the lightning protection system module is connected to the negative pole of the bus.

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