Surge protection device applied to FF bus network architecture

Abstract

The invention discloses a surge protection device applied to an FF bus network architecture, and the surge protection device comprises a first protection module which is at least provided with a TVS and a TVS early warning circuit, and when an FF bus generates surge, the TVS discharges firstly; the second protection module is at least provided with a piezoresistor, after the TVS discharges, the voltage of the piezoresistor reaches the breakdown voltage of the piezoresistor, and the piezoresistor discharges; and the third protection module is at least provided with a gas discharge tube, after the piezoresistor or the TVS discharges, the voltage of the gas discharge tube reaches the action voltage of the gas discharge tube, and the gas discharge tube discharges, so that each FF device in the FF bus can be prevented from being harassed by lightning stroke through the surge protection device, and the service life of the FF bus is prolonged. And the abnormity can be timely found at the initial failure stage of the TVS.

Description

Technical Field

[0001] The present invention relates to the field of lightning protection for FF bus network architectures, and particularly to a surge protector applied to FF bus network architectures, which can be used for lightning protection of FF bus network architectures. Background Art

[0002] Foundation Fieldbus (FF), as a digital communication protocol widely used in the field of industrial automation, its network architecture undertakes the core tasks of real-time data transmission and control instruction interaction among key devices in the process industry. The FF bus adopts a simplified communication protocol based on the ISO / OSI model, realizes multi-device interconnection through twisted pair or optical fiber media, and has the integrated characteristics of two-way communication, device power supply and data coupling.

[0003] However, when this highly integrated network architecture operates in a complex industrial environment, it faces multiple surge threats from electromagnetic interference, lightning induction, switching overvoltage, etc. The cable networks widely distributed in industrial sites often span different potential regions. When lightning strikes, the ground potential will instantaneously rise, forming a kilovolt-level transient voltage difference between the cable shielding layer and the core wire; the surge current generated by the start-stop of large motors, the opening and closing of circuit breakers, etc. invades the bus through inductive coupling; even electrostatic discharge phenomena will accumulate dangerous electric potentials at the device ports. These transient overvoltages have a microsecond-level rising edge and a peak current of thousands of amperes, far exceeding the tolerance limit of FF bus electronic components.

[0004] Although the physical layer design of the FF bus takes into account the requirements of conventional electromagnetic compatibility, its essence still belongs to a low-power, high-sensitivity digital communication system. The working voltage of bus devices is usually 9 - 32 VDC, the insulation withstand voltage value of communication chips is relatively low, while the surge pulse voltage in the actual industrial environment is relatively high. When the transient overvoltage conducts along the bus cable, it will first break down the interlayer insulation of the isolation transformer of the terminal device, resulting in the burning of the H1 card communication module; the continuous common-mode interference will disrupt the phase relationship of Manchester coding, causing data packet loss or check errors; more serious differential-mode impacts can directly damage the device power supply module, leading to the overall paralysis of the bus.

[0005] In the Chinese Patent Network, a method and device for surge protection of components of a distributed control system are disclosed, and its application number is: 201810856373.7. In this patent, the device involved can be used for lightning protection of the Foundation Fieldbus (at

[0046] of the specification). The device involves multiple modules, including: a current-limiting module, a surge protection logic analyzer, a database, a voltage-limiting module, etc. The device needs to analyze the current signal, judge whether it is struck by lightning according to the current signal, has a slow response and involves many modules, which is not easy to maintain. Summary of the Invention

[0006] The object of the present invention is to protect each FF device on the FF bus and avoid lightning interference to each FF device.

[0007] Another object of the present invention is to solve the problem that the failure of the transient voltage suppressor (TVS) is not easy to detect and is prone to failure, so that when a problem occurs with the TVS, it can be detected and discovered in a timely manner.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows.

[0009] The first protection module has at least a TVS and a TVS warning circuit. When a surge occurs on the FF bus, the TVS discharges first; the second protection module has at least a varistor. After the TVS discharges, the voltage of the varistor reaches the breakdown voltage of the varistor, and the varistor discharges; the third protection module has at least a gas discharge tube. After the varistor or the TVS discharges, the voltage of the gas discharge tube reaches the operating voltage of the gas discharge tube, and the gas discharge tube discharges.

[0010] Preferably, in the TVS warning circuit, there are at least a light-emitting diode, a rectifier bridge and a resistor; in the TVS warning circuit, the connection method includes: the lower end of the rectifier bridge is connected to the right end of the resistor, the left end of the resistor is connected to the input end of the light-emitting diode, and the output end of the light-emitting diode is connected to the input end of the TVS.

[0011] Preferably, in the TVS warning circuit, there is at least a relay; the output end of the TVS is connected to the left end of the relay.

[0012] Preferably, a diode group D2 is connected between the input end of the TVS and the rectifier bridge. The output end of the diode group D2 is connected to the input end of the TVS, and the input end of the diode group D2 is connected to the left end of the rectifier bridge.

[0013] Preferably, an inductance coil L3 is connected between the lower end of the gas discharge tube and the lower end of the varistor. The left end of the inductance coil is connected to the lower end of the gas discharge tube, and the right end of the inductance coil is connected to the lower end of the varistor.

[0014] Preferably, an inductance coil L1 is connected between the upper end of the gas discharge tube and the upper end of the varistor. The left end of the inductance coil is connected to the upper end of the gas discharge tube, and the right end of the inductance coil is connected to the upper end of the varistor.

[0015] Preferably, a diode group D1 is connected to the input end of the TVS. The input end of the diode group D1 is connected to the right end of an inductance coil L2, and the left end of the inductance coil L2 is connected to the upper end of the varistor.

[0016] Preferably, an inductance coil L4 is connected between the input end of the diode group D2 and the lower end of the varistor. The right end of the inductance coil L4 is connected to the input end of the diode group D2, and the left end of the inductance coil L4 is connected to the lower end of the varistor.

[0017] Preferably, the right end of the relay is connected to the input end of a diode group D3.

[0018] Preferably, in the third protection module, the gas discharge tube is grounded.

[0019] The beneficial effects of the present invention are as follows: when a surge occurs in the FF bus, the surge protector involved in the present invention can protect each FF device on the FF bus, and the FF devices can work normally; when the TVS in the surge protector is in the initial stage of failure, the problems occurring in the TVS can be detected in a timely manner; the surge protector involved in the present invention BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic framework diagram of the surge protector involved in the present invention.

[0021] Figure 2 is an application scenario diagram of the surge protector involved in the present invention.

[0022] Figure 3 is a circuit connection diagram of the surge protector involved in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To facilitate the description of the technical solutions of this embodiment, some terms involved in this embodiment are explained below.

[0024] TVS, whose Chinese name is bidirectional transient voltage suppressor diode. When the potential difference across the TVS reaches the breakdown voltage, the TVS will discharge, and its response time is faster than that of the varistor and the gas discharge tube.

[0025] Foundation Fieldbus FF (Fieldbus Foundation): It is designed for process automation and connects field devices through digital, serial, and two-way communication methods.

[0026] Embodiment 1. This embodiment discloses the specific working process of the surge protector involved in the present invention. Refer to Figure 1 .

[0027] In this embodiment, the surge protector includes: a first protection module, a second protection module, and a third protection module.

[0028] In the first protection module, there are at least a TVS, a TVS warning circuit, and several diode groups. The TVS warning circuit can detect the potential abnormal risk of the TVS in the initial stage of the TVS failure. Compared with the gas discharge tube and the varistor, the TVS has the fastest response speed and lower withstand voltage, so the TVS is more likely to fail compared with the gas discharge tube and the varistor.

[0029] In the second protection module, there is at least a varistor.

[0030] In the third protection module, there is at least a gas discharge tube, and the gas discharge tube is grounded.

[0031] An inductor coil L1 and an inductor coil L3 are connected between the varistor of the second protection module and the gas discharge tube of the third protection module, and the connection mode of the inductor coils is as described below.

[0032] The left end of the inductor coil L1 is connected to the upper end of the gas discharge tube of the third protection module, and the right end of the inductor coil L1 is connected to the upper end of the TVS of the second protection module.

[0033] The left end of the inductor coil L3 is connected to the lower end of the gas discharge tube of the third protection module, and the right end of the inductor coil L3 is connected to the upper end of the varistor of the second protection module.

[0034] An inductor coil L2 and an inductor coil L4 are connected between the varistor of the first protection module and the varistor of the second protection module, and the connection mode of the inductor coils is as described below.

[0035] The left end of the inductor coil L2 is connected to the upper end of the varistor of the second protection module, and the right end of the inductor coil L2 is connected to the upper end of the first protection module.

[0036] The left end of the inductor coil L4 is connected to the lower end of the varistor of the second protection module, and the right end of the inductor coil L4 is connected to the lower end of the first protection module.

[0037] The setting of the inductor coils is as described below.

[0038] The first case: When the current flowing through the inductor coil L1 increases, the direction of the induced electromotive force generated by the inductor coil L1 is: from left to right; when the current flowing through the inductor coil L2 increases, the direction of the induced electromotive force generated by the inductor coil L2 is: from right to left; when the current flowing through the inductor coil L3 increases, the direction of the induced electromotive force generated by the inductor coil L3 is: from right to left; when the current flowing through the inductor coil L4 increases, the direction of the induced electromotive force generated by the inductor coil L4 is: from left to right.

[0039] The second case: When the current flowing through the inductance coil L1 increases, the direction of the induced electromotive force generated by the inductance coil L1 is: from right to left; when the current flowing through the inductance coil L2 increases, the direction of the induced electromotive force generated by the inductance coil L2 is: from left to right; when the current flowing through the inductance coil L3 increases, the direction of the induced electromotive force generated by the inductance coil L3 is: from left to right; when the current flowing through the inductance coil L4 increases, the direction of the induced electromotive force generated by the inductance coil L4 is: from right to left.

[0040] These two cases respectively correspond to different flowing directions of the current in the surge protector.

[0041] In the same circuit, when the current increases, the relationship between the directions of the inductance coils is as described below.

[0042] When a surge occurs in the FF bus or the current in the FF bus increases, the direction of the induced electromotive force generated by the inductance coil L1 is different from the direction of the induced electromotive force generated by the inductance coil L3 and the direction of the induced electromotive force generated by the inductance coil L2.

[0043] When a surge occurs in the FF bus or the current in the FF bus increases, the direction of the induced electromotive force generated by the inductance coil L2 is different from the direction of the induced electromotive force generated by the inductance coil L4 and the direction of the induced electromotive force generated by the inductance coil L1 respectively.

[0044] When a surge occurs in the FF bus or the current in the FF bus increases, the direction of the induced electromotive force generated by the inductance coil L3 is different from the direction of the induced electromotive force generated by the inductance coil L1 and the direction of the induced electromotive force generated by the inductance coil L2 respectively.

[0045] When a surge occurs in the FF bus or the current in the FF bus increases, the direction of the induced electromotive force generated by the inductance coil L4 is different from the direction of the induced electromotive force generated by the inductance coil L2 and the direction of the induced electromotive force generated by the inductance coil L3 respectively.

[0046] When a surge occurs in the FF bus (taking the first case as an example), since the TVS has a higher sensitivity and faster response compared to the varistor of the second protection module and the gas discharge tube of the third module, when a surge is generated in the FF bus due to lightning strike, the TVS in the first protection module acts first, and the TVS is first broken down and conducted in this surge protector.

[0047] After the TVS in the first protection module is conducted, the current flowing through the TVS in the first protection module increases, and the current flowing through the inductance coil L4 connected to the lower end of the first protection module increases, generating an induced electromotive force in the direction from left to right.

[0048] Due to the inductance coil L2, when a surge occurs on the FF bus, the inductance coil L2 generates an induced electromotive force in the direction from right to left. Therefore, after the TVS of the first protection module conducts, the voltage drop generated on the inductance coil L2 and the inductance coil L3 plus the voltage drop of the TVS of the first protection module reaches the breakdown voltage of the varistor in the second protection module. At this time, the varistor in the second protection module starts to discharge.

[0049] After the varistor in the second protection module starts to discharge, the current flowing through the varistor in the second protection module increases, and the current flowing through the inductance coil L3 connected to the lower end of the varistor in the second protection module increases. The inductance coil L3 generates an induced electromotive force in the direction from right to left.

[0050] Due to the inductance coil L1, when a surge occurs on the FF bus, the current flowing through the inductance coil L1 increases, and the inductance coil generates an induced electromotive force in the direction from left to right. Therefore, after the varistor in the second protection module conducts, the voltage drop of the inductance coil L1 and the inductance coil L3 plus the breakdown voltage of the varistor in the second protection module reaches the operating voltage of the gas discharge tube in the third protection module, causing the gas discharge tube in the third protection module to discharge.

[0051] Since in the third protection module, the gas discharge tube is grounded, when a surge is generated on the FF bus due to lightning strike, most of the surge will flow into the ground through the gas discharge tube, protecting each FF device on the FF bus and preventing the FF devices on the FF bus from being disturbed by lightning, thereby avoiding the normal operation of the FF devices on the FF bus being affected by lightning.

[0052] When the FF bus is not struck by lightning and no current is generated, the first protection module, the second protection module, and the third protection module behave as completely open circuits. When a normal signal passes through the FF bus and is output to each device, the first protection module, the second protection module, and the third protection module will not generate any action. Therefore, it will not affect the normal signal.

[0053] Refer to Figure 2 , in the FF bus network architecture, the surge protector involved in this embodiment is installed between the controller and the fieldbus, and the factory-level backbone network controls the devices on the fieldbus through the controller.

[0054] When the FF bus is not disturbed by lightning strikes, the factory-level backbone network passes through the controller, and transmits the control signal through the fieldbus to each FF device connected to the fieldbus. The FF surge protector involved in the present invention will not have any impact on the control signal.

[0055] When the FF bus is struck by lightning, most of the current generated by the lightning strike flows into the ground through the surge protector involved in this embodiment. This not only ensures that each FF device in the fieldbus is protected from lightning strikes, but also avoids damage to the controller caused by lightning and damage to each device in the factory-level backbone network caused by lightning.

[0056] In this way, it can ensure the safety of each device in the FF bus network architecture when lightning strikes the FF bus, improving the risk resistance ability of the FF bus network architecture.

[0057] Embodiment 2, based on Embodiment 1, this embodiment further discloses the circuit connection mode of the surge protector involved in the present invention and the specific working process of the surge protector involved in the present invention. Refer to Figure 3 。

[0058] In this embodiment, the surge arrester has two input ports and two output ports. The input ports are respectively denoted as IN1 and IN2, and the output ports are respectively denoted as OUT1 and OUT2.

[0059] The circuit connection mode of the surge protector involved in this embodiment is as follows.

[0060] The surge protector involved in this embodiment includes: a first protection module, a second protection module, and a third protection module.

[0061] The first protection module includes: a TVS, a TVS warning circuit, a relay, and four groups of diode arrays.

[0062] The second protection module includes: a varistor.

[0063] The third protection module includes: a gas discharge tube, and the gas discharge tube of the third protection module is grounded.

[0064] The upper end of the gas discharge tube of the third protection module is connected to the input port IN1, and the lower end of the gas discharge tube of the third protection module is connected to the input port IN2.

[0065] The upper end of the gas discharge tube of the third protection module is connected to the left end of the inductor coil L1, and the lower end of the gas discharge tube of the third protection module is connected to the left end of the inductor coil L3.

[0066] The upper end of the varistor of the second protection module is connected to the right end of the inductor coil L1, and the lower end of the varistor of the second protection module is connected to the right end of the inductor coil L3.

[0067] The upper end of the varistor of the second protection module is connected to the left end of the inductor coil L2, and the lower end of the varistor of the second protection module is connected to the left end of the inductor coil L4.

[0068] The input end of the diode group D1 of the first protection module is connected to the right end of the inductance coil L2, and the input end of the diode group D2 of the first protection module is connected to the right end of the inductance coil L4.

[0069] The output end of the diode group D1 of the first protection module and the output end of the diode group D2 of the first protection module are connected to the TVS input end of the first protection module. The TVS output end of the first protection module is connected to the left end of the relay of the first protection module. The right end of the relay of the first protection module is connected to the input end of the diode group D3 of the first protection module and the output end of the diode group D4 of the first protection module.

[0070] In the warning circuit of the first protection module, it includes: a rectifier bridge, a light-emitting diode, and a resistor.

[0071] The connection method of the warning circuit of the first protection module is as follows.

[0072] The upper end of the rectifier bridge of the first protection module is connected to the right end of the relay of the first protection module. The right end of the rectifier bridge of the first protection module is connected to the output port OUT1. The right end of the rectifier bridge of the first protection module is connected to the input end of the diode group D2 of the first protection module. The lower end of the rectifier bridge of the first protection module is connected to the right end of the resistor of the first protection module. The left end of the resistor of the first protection module is connected to the input end of the light-emitting diode of the first protection module. The output end of the light-emitting diode of the first protection module is connected to the input end of the TVS of the first protection module.

[0073] The right end of the inductance coil L4, the input end of the diode group D2 of the first protection module, and the output end of the diode group D4 of the first protection module are all connected to the output port OUT2.

[0074] The right end of the inductance coil L2, the input end of the diode group D1 of the first protection module, and the output end of the diode group D3 of the first protection module are all connected to the output port OUT2.

[0075] In this embodiment, if the input port IN1 is positive and the output port IN2 is negative, then when a surge occurs on the FF bus or the current of the FF bus increases, the directions of the induced electromotive forces generated by each inductance coil are as described below.

[0076] The direction of the induced electromotive force generated by the inductance coil L1 is: from left to right; the direction of the induced electromotive force generated by the inductance coil L2 is: from right to left; the direction of the induced electromotive force generated by the inductance coil L3 is: from right to left; the direction of the induced electromotive force generated by the inductance coil L4 is: from left to right.

[0077] In this embodiment, if the input port IN1 is the negative electrode and the output port IN2 is the positive electrode, then when a surge occurs on the FF bus or the current of the FF bus increases, the directions of the induced electromotive forces generated by each inductive coil are as described below.

[0078] The direction of the induced electromotive force generated by the inductive coil L1 is: from right to left; the direction of the induced electromotive force generated by the inductive coil L2 is: from left to right; the direction of the induced electromotive force generated by the inductive coil L3 is: from left to right; the direction of the induced electromotive force generated by the inductive coil L4 is: from right to left.

[0079] When a surge occurs on the FF bus, the TVS of the first protection module does not show any abnormality, and the input port IN1 and the input port IN2 are the positive electrode and the negative electrode respectively, the specific working process of the surge protector involved in this embodiment is as described below.

[0080] Since the response speed of the TVS of the first protection module is faster than that of the varistor of the second protection module and the gas discharge tube of the third module, at this time, the varistor of the second protection module and the gas discharge tube of the third protection module act as completely open circuits, and the TVS of the first protection module is broken down and acts as a closed circuit.

[0081] At this time, the direction of the current flow is: flowing through the input port IN1, the inductor L1, the inductor L2, the diode group D1 of the first protection module, the TVS of the first protection module, the diode group D4 of the first protection module, the inductive coil L4, the inductive coil L3, and the input port IN2 in sequence. At this time, the current flowing through the inductive coil L4 increases, and the direction of the induced electromotive force generated is: from left to right; the current of the inductive coil L3 increases, and the direction of the induced electromotive force generated is: from right to left.

[0082] Since the FF bus is struck by lightning and a surge occurs, the current flowing through the inductive coil L2 increases, and the direction of the induced electromotive force generated by the inductive coil L2 is: from right to left.

[0083] At this time, the voltage drop generated by the inductive coil L2 and the inductive coil L3 plus the voltage drop generated by the TVS of the first protection module reaches the breakdown voltage of the varistor of the second protection module, and at this time, the varistor of the second protection module starts to discharge.

[0084] At this time, the direction of the current flow is: flowing through the input port IN1, the inductive coil L1, the varistor of the second protection module, the inductive coil L3, and the input port IN2 in sequence. The current of the inductive coil further increases, and the induced electromotive force with the direction from right to left is strengthened.

[0085] Since the FF bus is struck by lightning and a surge occurs, the current flowing through the inductive coil L1 increases, and the direction of the induced electromotive force generated by the inductive coil L1 is: from left to right.

[0086] Similarly, the voltage drops generated by the inductance coils L1 and L3 plus the breakdown voltage of the varistor of the second protection module reach the operating voltage of the gas discharge tube of the third protection module. At this time, the gas discharge tube of the third protection module discharges. Since the gas discharge tube of the third protection module is grounded, most of the current generated by lightning strikes flows into the ground, thereby protecting the safety of each FF device on the FF bus.

[0087] When the FF bus is not affected by lightning strikes and there is a normal signal flowing in, at this time, the gas discharge tube of the first protection module, the varistor of the second protection module, and the TVS of the third protection module all show a completely open circuit and will not affect the normal signal.

[0088] When a surge occurs on the FF bus, the TVS of the first protection module does not show any abnormalities, and the input port IN1 and the input port IN2 are the negative pole and the positive pole respectively. The specific working process of the surge protector involved in this embodiment is described as follows.

[0089] Since the response speed of the TVS of the first protection module is faster than that of the varistor of the second protection module and the gas discharge tube of the third module, at this time, the varistor of the second protection module and the gas discharge tube of the third protection module show a completely open circuit, and the TVS of the first protection module is broken down and shows a closed circuit.

[0090] At this time, the direction of current flow is: flowing through the input port IN2, the inductance coil L3, the inductance coil L4, the diode group D2 of the first protection module, the TVS of the first protection module, the diode group D3 of the first protection module, the inductance coil L2, the inductance coil L1, and the input port IN2 in sequence. The current flowing through the inductance coil L2 increases, and the direction of the induced electromotive force generated is: from left to right; the current flowing through the inductance coil L1 increases, and the direction of the induced electromotive force generated is: from right to left.

[0091] Due to the lightning strike interference on the FF bus, the current flowing through the inductance coil L4 increases, and the direction of the induced electromotive force generated by the inductance coil is: from right to left.

[0092] At this time, the voltage drop generated by the inductance coils L2 and L3 plus the voltage drop generated by the TVS of the first protection module reach the breakdown voltage of the varistor of the second protection module. At this time, the varistor of the second protection module starts to discharge.

[0093] At this time, the direction of current flow is: flowing through the input port IN2, the inductance coil L3, the varistor of the second protection module, the inductance coil L1, and the input port IN1 in sequence. The current flowing through the inductance coil L1 further increases, and the induced electromotive force in the direction from right to left is enhanced.

[0094] Similarly, the voltage drops generated by the inductance coils L1 and L3 plus the breakdown voltage of the varistor of the second protection module reach the operating voltage of the gas discharge tube of the third protection module. At this time, the gas discharge tube of the third protection module discharges. Since the gas discharge tube of the third protection module is grounded, most of the current generated by lightning flows into the ground, thereby protecting the safety of each FF device on the FF bus.

[0095] When the FF bus is not affected by lightning strikes and there is a normal signal flowing in, at this time, the gas discharge tube of the first protection module, the varistor of the second protection module, and the TVS of the third protection module all appear as completely open circuits and will not affect the normal signal.

[0096] In this embodiment, when the TVS of the first protection module is abnormal, if the input port IN2 is positive and the input port IN1 is negative. In the case of a normal signal flowing through the FF bus, the specific working process of the TVS warning circuit of the surge protector involved in this embodiment is as follows.

[0097] The direction of current flow is: flowing through the inductance coil L1, the inductance coil L2, the lower right bridge arm of the rectifier bridge of the first protection module, the resistor of the first protection module, the light-emitting diode of the first protection module, the TVS of the first protection module, the relay of the first protection module, the upper left bridge arm of the rectifier bridge of the first protection module, the inductance coil L4, the inductance coil L3, and the input port IN2 in sequence.

[0098] At this time, the light-emitting diode of the first protection module emits light, and relevant maintenance personnel can know that the TVS of the first protection module is abnormal through the information that the light-emitting diode emits light. If the TVS of the first protection module is damaged to a certain extent and the leakage current generated can drive the contact of the relay of the first protection module to close, ALM1 and ALM2 output an alarm signal to the subsequent system to remind relevant maintenance personnel to replace the TVS of the first protection module.

[0099] In this embodiment, when the TVS of the first protection module is abnormal, if the input port IN2 is positive and the input port IN1 is negative. In the case of a normal signal flowing through the FF bus, the specific working process of the TVS warning circuit of the surge protector involved in this embodiment is as follows.

[0100] The direction of current flow is: flowing through the input port IN2, the inductance coil L3, the inductance coil L4, the lower left bridge arm of the rectifier bridge of the first protection module, the resistor of the first protection module, the light-emitting diode of the first protection module, the TVS of the first protection module, the relay of the first protection module, the inductance coil L2, the inductance coil L1, and the input port IN1 in sequence.

[0101] At this time, the light-emitting diode of the first protection module emits light, and relevant maintenance personnel can learn that the TVS of the first protection module is abnormal through the information of the light-emitting diode. If the TVS of the first protection module is damaged to a certain extent and the leakage current generated can drive the relay contact of the first protection module to close, ALM1 and ALM2 output an alarm signal to the subsequent system to remind relevant maintenance personnel to replace the TVS of the first protection module.

[0102] Therefore, for the surge protector involved in this embodiment, there is no need to distinguish polarities whether for lightning current signal discharge or normal FF signal transmission, which is convenient for installation and maintenance and can timely detect the abnormality of the TVS of the first protection module.

[0103] The present invention deeply elaborates its purpose, technical solution and beneficial effects through specific embodiments. However, these embodiments are only examples to show the application modes of the invention and do not constitute a limitation on the protection scope of the present invention. We clearly point out that any reasonable modification, equivalent replacement or technical improvement under the guidance of the spirit and principle of the present invention should be included in the protection scope of the present invention. This means that as long as these changes do not deviate from the core idea and basic functions of the invention, they should be protected by the patent right. The protection scope of the present invention should be broad, including all direct and obvious variants as well as non-obvious innovations that technical experts can reasonably deduce based on the disclosed content of the present invention. This broad protection aims to promote further research and development based on the present invention while ensuring that its innovation and practicality are comprehensively protected by law.

Claims

1. A surge protector applied to an FF bus network architecture, characterized in that, Including: A first protection module, having at least a TVS and a TVS warning circuit. When a surge occurs on the FF bus, the TVS discharges first; A second protection module, having at least a varistor. After the TVS discharges, the voltage of the varistor in the second protection module reaches the breakdown voltage of the varistor, and the varistor discharges; A third protection module, having at least a gas discharge tube. After the varistor or the TVS discharges, the voltage of the gas discharge tube in the third protection module reaches the operating voltage of the gas discharge tube, and the gas discharge tube discharges.

2. The surge protector applied to the FF bus network architecture according to claim 1, characterized in that, In the TVS warning circuit, there are at least a light-emitting diode, a rectifier bridge and a resistor; in the TVS warning circuit, the connection method includes: the lower end of the rectifier bridge is connected to the right end of the resistor, the left end of the resistor is connected to the input end of the light-emitting diode, and the output end of the light-emitting diode is connected to the input end of the TVS.

3. A surge protector applied to an FF bus network architecture according to claim 1, characterized in that, In the TVS warning circuit, there is at least a relay; the output end of the TVS is connected to the left end of the relay.

4. The surge protector applied to the FF bus network architecture according to claim 2, characterized in that, A diode group D2 is connected between the input end of the TVS and the rectifier bridge. The output end of the diode group D2 is connected to the input end of the TVS, and the input end of the diode group D2 is connected to the left end of the rectifier bridge.

5. A surge protector applied to an FF bus network architecture according to any one of claims 1 to 4, characterized in that, An inductance coil L3 is connected between the lower end of the gas discharge tube and the lower end of the varistor. The left end of the inductance coil is connected to the lower end of the gas discharge tube, and the right end of the inductance coil is connected to the lower end of the varistor.

6. A surge protector applied to an FF bus network architecture according to any one of claims 1 to 4, characterized in that, An inductance coil L1 is connected between the upper end of the gas discharge tube and the upper end of the varistor. The left end of the inductance coil is connected to the upper end of the gas discharge tube, and the right end of the inductance coil is connected to the upper end of the varistor.

7. A surge protector applied to an FF bus network architecture according to any one of claims 1 to 4, characterized in that, A diode group D1 is connected to the input end of the TVS. The input end of the diode group D1 is connected to the right end of an inductance coil L2, and the left end of the inductance coil L2 is connected to the upper end of the varistor.

8. The surge protector applied to the FF bus network architecture according to claim 4, characterized in that, An inductance coil L4 is connected between the input end of the diode group D2 and the lower end of the varistor. The right end of the inductance coil L4 is connected to the input end of the diode group D2, and the left end of the inductance coil L4 is connected to the lower end of the varistor.

9. The surge protector applied to the FF bus network architecture according to claim 3, characterized in that, The right end of the relay is connected to the input end of a diode group D3.

10. A surge protector applied to an FF bus network architecture according to claim 1 or 2 or 3 or 4 or 8, characterized in that, In the third protection module, the gas discharge tube is grounded.

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