CN217642717U - Induction lightning protection device applied to radio frequency interface - Google Patents
Induction lightning protection device applied to radio frequency interface Download PDFInfo
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- CN217642717U CN217642717U CN202221537106.1U CN202221537106U CN217642717U CN 217642717 U CN217642717 U CN 217642717U CN 202221537106 U CN202221537106 U CN 202221537106U CN 217642717 U CN217642717 U CN 217642717U
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Abstract
The utility model provides a be applied to radio frequency interface's response lightning protection device belongs to lightning protection technical field. Wherein, should be applied to the induction lightning protection device of radio frequency interface and include: the overvoltage protection circuit comprises a first-stage time domain overvoltage protection circuit, a frequency domain filter circuit and a second-stage time domain overvoltage protection circuit which are sequentially connected; the first-stage time domain overvoltage protection circuit is arranged at the input end of the inductive lightning protection device; the second-stage time domain overvoltage protection circuit is arranged at the output end of the inductive lightning protection device. Through setting up the first order time domain overvoltage crowbar, frequency domain filter circuit and the second level time domain overvoltage crowbar that the order is connected, first order time domain overvoltage crowbar sets up in the input, and the second level time domain overvoltage crowbar sets up in the output, based on time domain and frequency domain dichotomy, can carry out quick, effectual discharge and filtering to the response thunder and lightning energy that gets into the radio frequency link through radio frequency interface, can improve the effect of inducing thunder and lightning protection to the electronic equipment who contains radio frequency interface.
Description
Technical Field
The utility model relates to a lightning protection technical field especially relates to a be applied to radio frequency interface's response lightning protection device.
Background
Induced lightning, also known as induced lightning, lightning induced or induced overvoltage, refers to an induced overvoltage produced by a powerful pulsed electromagnetic field generated by lightning current when lightning strikes discharge on nearby overhead lines, grounded lines, rails or similar conductors during the formation of a thundercloud. Induced lightning invades the protected area in the form of lightning waves, and damages electric and electronic equipment and systems.
With the wider application of radio frequency communication electronic equipment, a lightning pulse electromagnetic field generated by induced lightning can enter a radio frequency link after being coupled by a front door and a rear door of radio frequency communication electronic equipment, such as an antenna, a feeder line and the like, so that the equipment is influenced or even damaged.
At present, a receiving channel of a radio frequency link of a medium-low frequency radio frequency communication electronic device generally includes a primary overvoltage protection circuit (generally, a gas discharge tube, a transient voltage suppression diode or a switching diode BAV99, etc.) and a modular low-pass filter with a cutoff frequency of about 1 MHz. The transient interference with nanosecond rising edge time and small energy, such as electrostatic discharge and electric fast transient pulse groups, has a good protection effect generally, but has a poor protection effect on transient interference with microsecond rising edge time and large energy, such as induced lightning and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be applied to radio frequency interface's response lightning protection device for solve among the prior art and respond to the relatively poor defect of effect of lightning protection to the radio frequency link, realize responding to the lightning protection to the radio frequency communication electronic equipment who contains radio frequency interface more effectively.
The utility model provides a be applied to radio frequency interface's response lightning protection device, include: the first-stage time domain overvoltage protection circuit, the frequency domain filter circuit and the second-stage time domain overvoltage protection circuit are connected in sequence; the first-stage time domain overvoltage protection circuit is arranged at the input end of the inductive lightning protection device; the second-stage time domain overvoltage protection circuit is arranged at the output end of the induction lightning protection device.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, first order time domain overvoltage crowbar includes gas discharge tube.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, second level time domain overvoltage crowbar includes transient voltage suppression diode.
According to the utility model provides an induction lightning protection device applied to radio frequency interface, the frequency domain filter circuit comprises a high pass filter and a low pass filter which are connected with each other; the high-pass filter is connected with the first-stage time domain overvoltage protection circuit; and the low-pass filter is connected with the second-stage time domain overvoltage protection circuit.
According to the utility model provides an induction lightning protection device applied to a radio frequency interface, the frequency domain filter circuit comprises a band-pass filter; the band-pass filter is respectively connected with the first-stage time domain overvoltage protection circuit and the second-stage time domain overvoltage protection circuit.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, high pass filter is five grades of LC high pass filter.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, high pass filter includes: the first inductor, the second inductor, the third inductor, the first capacitor and the second capacitor;
the first end of the first inductor is connected with the first end of the first capacitor; the second end of the first inductor is connected with the second end of the second inductor and the second end of the third inductor; the second end of the first capacitor is connected with the first end of the second inductor and the first end of the second capacitor; the second end of the second capacitor is connected with the first end of the third inductor.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, low pass filter is five ranks LC low pass filter.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, low pass filter includes: a fourth inductor, a fifth inductor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the third capacitor is connected with the first end of the fourth inductor; a second end of the third capacitor is connected with a second end of the fourth capacitor and a second end of the fifth capacitor; a second end of the fourth inductor is connected with a first end of the fourth capacitor and a first end of the fifth inductor; the second end of the fifth inductor is connected with the first end of the fifth capacitor.
According to the utility model provides a pair of be applied to radio frequency interface's response lightning protection device, first order time domain overvoltage crowbar with second level time domain overvoltage crowbar all ground connection.
The utility model provides a be applied to radio frequency interface's response lightning protection device, first order time domain overvoltage protection circuit through setting up the order and connecting, frequency domain filter circuit and second level time domain overvoltage protection circuit, first order time domain overvoltage protection circuit sets up in response lightning protection device's input, second level time domain overvoltage protection circuit sets up in response lightning protection device's output, based on time domain and frequency domain dichotomy, can go on fast to the response thunder electric energy that gets into the radio frequency link through radio frequency interface, effectual discharge and filtering, can improve the protective effect who responds to the lightning protection to the radio frequency communication electronic equipment who contains radio frequency interface.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is one of the schematic structural diagrams of the inductive lightning protection device applied to the radio frequency interface provided by the present invention;
fig. 2 is a second schematic structural diagram of an inductive lightning protection device applied to a radio frequency interface according to the present invention;
fig. 3 is a third schematic structural diagram of an inductive lightning protection device applied to a radio frequency interface according to the present invention;
fig. 4 is a schematic circuit diagram of the inductive lightning protection device applied to the radio frequency interface.
Reference numerals are as follows:
100: an inductive lightning protection device; 101: a first-stage time domain overvoltage protection circuit; 102: a frequency domain filter circuit; 103: a second-stage time domain overvoltage protection circuit; 201: a high-pass filter; 202: a low-pass filter; 301: a band pass filter.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "length", "width", "height", "upper", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of the description of the embodiments of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and not order.
In the description of the embodiments of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
The present invention provides an inductive lightning protection device for a radio frequency interface, which is described below with reference to fig. 1 to 4.
Fig. 1 is one of the schematic structural diagrams of the inductive lightning protection device applied to the radio frequency interface provided by the present invention. As shown in fig. 1, the inductive lightning protection device 100 applied to the rf interface includes: the overvoltage protection circuit comprises a first-stage time domain overvoltage protection circuit 101, a frequency domain filter circuit 102 and a second-stage time domain overvoltage protection circuit 103 which are connected in sequence; the first-stage time domain overvoltage protection circuit 101 is arranged at the input end of the inductive lightning protection device 100; the second stage time domain overvoltage protection circuit 103 is disposed at an output end of the inductive lightning protection device 100.
Specifically, the inductive lightning protection device (hereinafter referred to as "inductive lightning protection device") applied to the radio frequency interface may be disposed between the radio frequency interface included in the electronic device and the radio frequency circuit included in the radio frequency communication electronic device, so as to perform inductive lightning protection on a radio frequency link including the radio frequency interface and the radio frequency circuit. The radio frequency circuit may be a lightning sensitive radio frequency circuit, and thus the radio frequency circuit may be referred to as a lightning sensitive radio frequency circuit.
The input end of the inductive lightning protection device 100 is used for connecting a radio frequency interface of an electronic device; the output of the inductive lightning protection device 100 is used for connecting to the radio frequency circuit comprised by the electronic equipment.
Under the condition that the input end and the output end of the inductive lightning protection device 100 are respectively connected with the radio frequency interface of the electronic equipment and the radio frequency circuit included in the electronic equipment, inductive lightning energy sequentially passes through the radio frequency interface and the input end to enter the inductive lightning protection device 100.
The electronic device may be an electronic device comprising a radio frequency interface and an inductive lightning sensitive radio frequency circuit. Illustratively, the electronic device may be a radio frequency communication electronic device.
Generally, after the inductive lightning energy enters the radio frequency link in a coupling mode, the energy of the inductive lightning which is coupled to the transmitting channel or the receiving channel is small due to the high isolation degree of the duplexer in the radio frequency link. In a transmitting channel of a radio frequency link, a power amplifier (called a 'power amplifier' for short) can bear a high upper limit of power capacity, while a low noise amplifier (called a 'low noise amplifier' for short) in a receiving channel belongs to a very sensitive device, so that the small energy coupled into the radio frequency link after passing through a duplexer has relatively little threat to the power amplifier, but the low noise amplifier can be a fatal threat. In practical applications, the probability that the receiving channel of the radio frequency communication electronic device with longer antenna such as middle and low frequency, high frequency, very high frequency, etc. is damaged by the inductive lightning energy is far beyond the transmitting channel, especially the middle and low frequency radio frequency communication electronic device with the longest antenna. Therefore, it is very important for the inductive lightning protection of the electronic equipment of medium and low frequency radio frequency communication.
Optionally, the radio frequency interface of the electronic device and the radio frequency circuit included in the electronic device may be a medium-low frequency radio frequency interface and a medium-low frequency radio frequency circuit, respectively. The induced lightning sensitive rf circuit may be an induced lightning sensitive rf circuit for medium and low frequency communication, but is not limited thereto.
The lightning protection means 100 mainly comprises two parts: a time domain overvoltage protection circuit and a frequency domain filter circuit 102.
The time domain overvoltage protection circuit is used for carrying out amplitude limiting processing on the induced lightning energy received by the input end, and the frequency domain filter circuit 102 is used for carrying out filtering processing on the induced lightning energy received by the input end, so that the time domain overvoltage protection circuit and the frequency domain filter circuit 102 can be used for providing induced lightning protection for the induced lightning sensitive radio frequency circuit.
The time domain overvoltage protection circuit can comprise a first-stage time domain overvoltage protection circuit 101 and a second-stage time domain overvoltage protection circuit 103, which form a second-stage time domain overvoltage protection circuit.
The first stage time domain overvoltage protection circuit 101 may be disposed at an input of the inductive lightning protection device 100. And the first-stage time domain overvoltage protection circuit 101 is used for discharging main inductive lightning energy.
The second stage time domain overvoltage protection circuit 103 may be disposed at an output of the inductive lightning protection device 100. And the second-stage time domain overvoltage protection circuit 103 is used for providing fine protection of inductive lightning protection for the inductive lightning sensitive radio frequency circuit connected with the output end.
The first-stage time domain overvoltage protection circuit 101 can be connected to the foremost part of the whole circuit part in the inductive lightning protection device 100, and bypasses most of inductive lightning energy introduced into the radio frequency interface through an antenna and a feeder line thereof; the second stage time domain overvoltage protection circuit 103 may be connected to the rear-most part of the whole circuit in the inductive lightning protection device 100, and connected in parallel with the inductive lightning sensitive rf circuit to be protected, so as to provide fine protection for the inductive lightning sensitive rf circuit.
The frequency domain filter circuit 102 must be placed in the middle frequency domain filter circuit 102 of the secondary time domain overvoltage protection circuit, and can be used to provide inductive lightning protection for the inductive lightning sensitive radio frequency circuit and also provide decoupling for the secondary time domain overvoltage protection circuit.
The embodiment of the utility model provides an induction lightning protection device, based on time domain and frequency domain dichotomy, can realize can be applied to the induction lightning protection based on time domain and frequency domain dichotomy radio frequency interface of well low frequency communication, provide more reliable protection from two dimensions of time domain and frequency domain middle low frequency communication etc. induction lightning sensitive radio frequency circuit. The inductive lightning protection device is mainly characterized in that frequency domain filtering and time domain overvoltage protection are combined, and the inductive lightning protection device is a brand new idea.
The embodiment of the utility model provides an in, set up second grade time domain overvoltage crowbar and frequency domain filter circuit through electronic equipment's such as centering low frequency communication radio frequency interface, protect from two dimensions of time domain and frequency domain. Through the two-stage time domain overvoltage protection circuit, signals input to the inductive lightning sensitive radio frequency circuit to be protected can be guaranteed, low residual voltage which can be borne by the inductive lightning sensitive radio frequency circuit is achieved, and according to the characteristic that most energy of lightning is concentrated below 34kHz, other frequency band signals which possibly cause danger outside the working frequency band of the inductive lightning sensitive radio frequency circuit can be filtered through the frequency domain filter circuit, so that the problem that the inductive lightning sensitive radio frequency circuit used for medium and low frequency communication and the like is reliably protected in a time domain and frequency domain protection mode is solved.
The embodiment of the utility model provides an induction lightning protection device, can implant electronic equipment's such as low and medium frequency communication equipment radio frequency interface, except the induction thunder, to the electric fast transient pulse crowd in GB/T17626.4, electromagnetic pulse's among the GJB8848-2016 irradiation test and pulse current injection test, and the electrostatic discharge sensitivity among the GJB151B-2013, RS105, CS114, CS115, the transient interference's of other forms such as CS116 protection, possess positive promotion meaning equally, can play better protecting effect.
The embodiment of the utility model provides a through the first order time domain overvoltage crowbar that sets up the order and connect, frequency domain filter circuit and second level time domain overvoltage crowbar, first order time domain overvoltage crowbar sets up in response lightning protection device's input, second level time domain overvoltage crowbar sets up in response lightning protection device's output, based on time domain and frequency domain dichotomy, can carry out fast, effectual discharge and filtering to the response thunder energy that gets into the radio frequency link through radio frequency interface, can improve the protective effect that carries out response lightning protection to the radio frequency communication electronic equipment who contains radio frequency interface.
Based on the content of any of the above embodiments, the first stage time domain overvoltage protection circuit 101 comprises a gas discharge tube.
Specifically, the first-stage time-domain overvoltage protection circuit 101 may be mainly composed of a gas discharge tube. The gas discharge tube may be connected between the radio frequency signal line and ground.
Alternatively, the first-stage time-domain overvoltage protection circuit 101 may employ a gas discharge tube, and the gas discharge tube is connected between the radio-frequency signal line and the ground. The gas discharge tube mainly functions to bypass most of the inductive lightning energy.
Gas Discharge Tubes (GDTs) are a type of Discharge tubes that can be used for surge arresters or antenna switching tubes for overvoltage protection. Two or more electrodes are provided in the gas discharge tube and filled with a certain amount of inert gas. The gas discharge tube is a gap type lightning protection element and can be used for lightning protection of a communication system.
The gas discharge tube is a gap type lightning protection component, is commonly used in the first stage or the first two stages of a multi-stage protection circuit, and plays the roles of discharging lightning instantaneous overcurrent and limiting overvoltage.
The gas discharge tube has large flow and small parasitic capacitance, and can realize the discharge of large inductive lightning energy of the radio frequency link, thereby playing a role in roughly protecting inductive lightning sensitive radio frequency circuits used for medium and low frequency communication and the like.
The embodiment of the utility model provides a through adopting the first order time domain overvoltage crowbar including gas discharge tube, can discharge main response thunder electric energy more fast, effectively.
Based on the content of any of the above embodiments, the second stage time domain overvoltage protection circuit 103 includes a transient voltage suppression diode.
Specifically, the second stage time-domain overvoltage protection circuit 103 may be mainly composed of transient voltage suppression diodes. The transient voltage suppression diode can be connected between a radio frequency signal line and the ground, and provides fine protection for the lightning induction sensitive radio frequency circuit.
Optionally, the second stage time-domain overvoltage protection circuit 103 may employ a transient voltage suppression diode, and the transient voltage suppression diode may be connected between the rf signal line and ground, as with the GDT in the first stage time-domain overvoltage protection circuit 101.
A Transient Voltage Suppressor (TVS) diode, also called TVS diode, TVS transistor or TVS, can perform fast overvoltage protection on a circuit.
The TVS tube has high response speed and low clamping voltage, and can play a role in finely protecting an inductive lightning sensitive radio frequency circuit for medium and low frequency communication and the like.
It should be noted that, under the condition that the first-stage time domain overvoltage protection circuit 101 adopts a gas discharge tube and the second-stage time domain overvoltage protection circuit adopts a TVS tube, the frequency domain filter circuit arranged in the middle of the second-stage time domain overvoltage protection circuit can be specifically used for providing inductive lightning protection for the inductive lightning sensitive radio frequency circuit, and simultaneously providing decoupling for the gas discharge tube and the TVS tube with different response speeds in the second-stage time domain overvoltage protection circuit.
The embodiment of the utility model provides a through adopting the second level time domain overvoltage crowbar including transient voltage suppression diode, can carry out more meticulous protection to response thunder and lightning sensitive radio frequency circuit.
Fig. 2 is a second schematic structural diagram of the inductive lightning protection device applied to the radio frequency interface according to the present invention. Based on the content of any of the above embodiments, as shown in fig. 2, the frequency domain filtering circuit 102 includes a high pass filter 201 and a low pass filter 202 connected to each other; the high-pass filter 201 is connected with the first-stage time domain overvoltage protection circuit 101; the low pass filter 202 is connected with the second stage time domain overvoltage protection circuit 103.
Specifically, the frequency domain filter circuit 102 may be composed of a high-pass filter 201 and a low-pass filter 202 connected in series.
The high-pass filter 201 and the low-pass filter 202 are connected between the first stage time domain overvoltage protection circuit 101 and the second stage time domain overvoltage protection circuit 103. Namely, the first stage time domain overvoltage protection circuit 101, the high pass filter 201, the low pass filter 202 and the second stage time domain overvoltage protection circuit 103 are connected in sequence. The first end of the high-pass filter 201 is connected with the first-stage time-domain overvoltage protection circuit 101, the second end of the high-pass filter 201 is connected with the first end of the low-pass filter 202, and the second end of the low-pass filter 202 is connected with the second-stage time-domain overvoltage protection circuit 103.
The high-pass filter 201 may be any filter having a high-pass characteristic.
The low-pass filter 202 may be any filter having a low-pass characteristic.
The cut-off frequency of the high-pass filter 201 is less than or equal to the lowest frequency in the working bandwidth of the inductive lightning-sensitive radio frequency circuit to be protected. That is, the cut-off frequency of the high-pass filter 201 is less than or equal to the lowest frequency in the operating frequency band of the radio frequency link of the radio frequency communication electronic equipment (e.g., the middle and low frequency radio frequency communication electronic equipment, etc.) connected to the inductive lightning protection device 100.
The cut-off frequency of the low-pass filter 202 is greater than or equal to the highest frequency in the operating bandwidth of the inductive lightning sensitive radio frequency circuit to be protected. That is, the cut-off frequency of the low-pass filter 202 is greater than or equal to the highest frequency in the operating frequency band of the rf link of the rf communication electronic equipment (e.g., the middle and low frequency rf communication electronic equipment, etc.) connected to the inductive lightning protection device 100.
Through the high-pass filter 201 and the low-pass filter 202, signals in the operating frequency band of the radio frequency link of the radio frequency communication electronic equipment (such as medium and low frequency radio frequency communication electronic equipment) can be separated, and signals in other frequency bands which may cause danger can be shielded.
It can be understood that the radio frequency link of the electronic equipment for medium and low frequency radio frequency communication is a medium and low frequency radio frequency link.
Optionally, in the application environment of the induced lightning sensitive rf circuit, only considering the protection of the single transient disturbance induced lightning, the embodiment of the present invention provides that the low pass filter 202 can be omitted, that is, the frequency domain filter circuit 102 can only include the high pass filter 201, the first end of the high pass filter 201 is connected to the first stage time domain overvoltage protection circuit 101, and the second end of the high pass filter 201 is connected to the second stage time domain overvoltage protection circuit 103.
The embodiment of the utility model provides a through cut-off frequency be less than or equal to the low pass filter of the lowest frequency in the sensitive radio frequency circuit's of response thunder and lightning work bandwidth that needs the protection, be connected with the low pass filter of the highest frequency in the sensitive radio frequency circuit's of response thunder and lightning work bandwidth that needs the protection with cut-off frequency be greater than or equal to this, constitute frequency domain filter circuit, can be quicker, carry out filtering to response thunder and lightning energy effectively and handle, with the sensitive radio frequency circuit of response thunder and lightning protection is protected more effectively, can improve the protective effect who responds to the thunder and lightning protection to the radio frequency communication electronic equipment who contains radio frequency interface.
Fig. 3 is a third schematic structural diagram of the inductive lightning protection device applied to the radio frequency interface of the present invention. Based on the content of any of the above embodiments, as shown in fig. 3, the frequency domain filtering circuit 102 includes a band pass filter 301; the band-pass filter 301 is respectively connected with the first-stage time domain overvoltage protection circuit 101 and the second-stage time domain overvoltage protection circuit 103.
Specifically, the frequency domain filter circuit 102 may be directly composed of the band pass filter 301.
The band-pass filter 301 may be connected between the first-stage time domain overvoltage protection circuit 101 and the second-stage time domain overvoltage protection circuit 103, a first end of the band-pass filter 301 is connected to the first-stage time domain overvoltage protection circuit 101, and a second end of the band-pass filter 301 is connected to the second-stage time domain overvoltage protection circuit 103.
The band pass filter 301 may be any filter having a band pass characteristic.
The lower bound of the frequency range allowed by the band-pass filter 301 is less than or equal to the lowest frequency in the working bandwidth of the inductive lightning-sensitive radio-frequency circuit to be protected; the upper bound of the frequency interval allowed by the band-pass filter 301 is greater than or equal to the highest frequency in the operating bandwidth of the inductive lightning sensitive radio frequency circuit to be protected.
Optionally, the bandwidth (i.e. the range of allowed frequency intervals) of the band-pass filter 301 may be greater than or equal to the bandwidth of the operating frequency band of the radio frequency link of the radio frequency communication electronic device (e.g. medium and low frequency radio frequency communication electronic device, etc.) connected to the inductive lightning protection device 100. Preferably, the bandwidth of the band-pass filter 301 is equal to the bandwidth of the operating frequency band of the radio frequency link of the radio frequency communication electronic device (e.g., middle and low frequency radio frequency communication electronic device, etc.) connected to the inductive lightning protection device 100, that is, the frequency interval allowed by the band-pass filter 301 is the same as the operating frequency band of the radio frequency link of the radio frequency communication electronic device (e.g., middle and low frequency radio frequency communication electronic device, etc.) connected to the inductive lightning protection device 100.
The embodiment of the utility model provides a constitute frequency domain filter circuit through band-pass filter, can carry out filtering process to response thunder electric energy more fast, effectively to protect the sensitive radio frequency circuit of response thunder and lightning more effectively, can improve and respond to lightning protection's protecting effect to the radio frequency communication electronic equipment who contains radio frequency interface.
Based on the content of any of the above embodiments, the high-pass filter 201 is a fifth-order LC high-pass filter.
Specifically, the high-pass filter 201 may be an LC filter having a high-pass characteristic.
Alternatively, the high pass filter 201 may be a fifth order LC high pass filter with a high pass characteristic.
An LC filter, also called a passive filter, is a filter circuit designed by using a combination of an inductor, a capacitor, and a resistor. The LC filter may filter out certain harmonics or multiples.
The LC filter has the advantages of simple structure, low cost, high operation reliability, low operation cost and the like.
The embodiment of the utility model provides a through adopting five rank LC high pass filter, the structure is simpler, the cost is cheaper, operational reliability is higher and the working costs is lower, and high pass filtering's effect is more excellent.
Fig. 4 is a schematic circuit diagram of the inductive lightning protection device applied to the radio frequency interface. Based on the content of any of the above embodiments, as shown in fig. 4, the high-pass filter 201 includes: the inductor comprises a first inductor L1, a second inductor L2, a third inductor L3, a first capacitor C1 and a second capacitor C2.
Specifically, in the case where the high pass filter 201 is a fifth-order LC high pass filter, the fifth-order LC high pass filter may be composed of 3 inductors (the first inductor L1, the second inductor L2, and the third inductor L3) and 2 capacitors (the first capacitor C1 and the second capacitor C2).
The first end of the first inductor L1 is connected with the first end of the first capacitor C1; the second end of the first inductor L1 is connected to the second end of the second inductor L2 and the second end of the third inductor L3; the second end of the first capacitor C1 is connected with the first end of the second inductor L2 and the first end of the second capacitor C2; the second terminal of the second capacitor C2 is connected to the first terminal of the third inductor L3.
Specifically, the first end of the first inductor L1 may be connected to the first end of the first capacitor C1. The first terminal of the first inductor L1 and the first terminal of the first capacitor C1 may be connected to the input terminal J1 of the inductive lightning protection device 100.
The first capacitor C1 and the second capacitor C2 may be connected in series. A first end of the second inductor L2 may be connected to a junction of the first capacitor C1 and the second capacitor C2.
A second terminal of the second capacitor C2 may be connected to a first terminal of the third inductor L3.
The second terminal of the first inductor L1 may be connected to the second terminal of the second inductor L2 and the second terminal of the third inductor L3.
Alternatively, the second terminal of the first inductor L1, the second terminal of the second inductor L2, and the second terminal of the third inductor L3 may all be grounded.
The GDT forming the first stage time-domain overvoltage protection circuit 101 may be connected in parallel with the first inductor L1, that is, a first terminal of the GDT may be connected to the input terminal J1 of the inductive lightning protection device 100, and a second terminal of the GDT may be connected to ground.
The embodiment of the utility model provides a through adopting five grades of LC high pass filter, the structure is simpler, the cost is cheaper, the operational reliability is higher and the working costs is lower, and the effect of high pass filtering is more excellent.
Based on the content of any of the above embodiments, the low-pass filter is a fifth-order LC low-pass filter.
Specifically, the low-pass filter 202 may be an LC filter having a low-pass characteristic.
Alternatively, the low pass filter 202 may be a fifth order LC low pass filter with a low pass characteristic.
An LC filter, also called a passive filter, is a filter circuit designed by using a combination of an inductor, a capacitor, and a resistor. The LC filter may filter out certain harmonics or multiples.
The LC filter has the advantages of simple structure, low cost, high operation reliability, low operation cost and the like.
The embodiment of the utility model provides a through adopting five grades of LC low pass filter, the structure is simpler, the cost is cheaper, the operational reliability is higher and the working costs is lower, low pass filter's effect is more excellent.
Based on the content of any of the above embodiments, as shown in fig. 4, the low-pass filter 202 includes: a fourth inductor L4, a fifth inductor L5, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5.
Specifically, in the case where the low-pass filter 202 is a fifth-order LC low-pass filter, the fifth-order LC low-pass filter may be composed of 2 inductors (fourth inductor L4 and fifth inductor L5) and 3 capacitors (third capacitor C3, fourth capacitor C4 and fifth capacitor C5).
A first end of the third capacitor C3 is connected with a first end of the fourth inductor L4; a second end of the third capacitor C3 is connected to a second end of the fourth capacitor C4 and a second end of the fifth capacitor C5; a second end of the fourth inductor L4 is connected to a first end of the fourth capacitor C4 and a first end of the fifth inductor L5; the second terminal of the fifth inductor L5 is connected to the first terminal of the fifth capacitor C5.
In particular, the second terminal of the fifth inductor L5 may be connected with the first terminal of the fifth capacitor C5. The second terminal of the fifth inductor L5 and the first terminal of the fifth capacitor C5 may both be connected to the output terminal J2 of the inductive lightning protection device 100.
The fourth inductor L4 and the fifth inductor L5 may be connected in series. A first end of the fourth capacitor C4 may be connected to a connection of the fourth inductor L4 and the fifth inductor L5.
A first terminal of the third capacitor C3 may be connected to a first terminal of the fourth inductor L4.
A second terminal of the third capacitor C3 may be connected to a second terminal of the fourth capacitor C4 and a second terminal of the fifth capacitor C5.
Alternatively, the second terminal of the third capacitor C3, the second terminal of the fourth capacitor C4, and the second terminal of the fifth capacitor C5 may all be grounded.
Optionally, the second end of the second capacitor C2 and the first end of the third inductor L3 may be connected to the first end of the third capacitor C3 and the first end of the fourth inductor L4; the second end of the first inductor L1, the second end of the second inductor L2, and the second end of the third inductor L3 may be connected to the second end of the third capacitor C3, the second end of the fourth capacitor C4, and the second end of the fifth capacitor C5. The second end of the first inductor L1, the second end of the second inductor L2, the second end of the third inductor L3, the second end of the third capacitor C3, the second end of the fourth capacitor C4, and the second end of the fifth capacitor C5 may all be grounded.
The TVS forming the second stage time-domain overvoltage protection circuit 103 may be connected in parallel with the fifth capacitor C5, that is, a first terminal of the TVS may be connected to the output terminal J2 of the inductive lightning protection device 100, and a second terminal of the TVS may be grounded.
The embodiment of the utility model provides a through adopting five grades of LC low pass filter, the structure is simpler, the cost is cheaper, the operational reliability is higher and the working costs is lower, low pass filter's effect is more excellent.
Based on the content of any of the above embodiments, the first stage time domain overvoltage protection circuit 101 and the second stage time domain overvoltage protection circuit 103 are both grounded.
Specifically, a first terminal of the first stage time domain overvoltage protection circuit 101 may be connected to an input terminal of the inductive lightning protection device 100, and a second terminal of the first stage time domain overvoltage protection circuit 101 may be grounded.
A first terminal of the second stage time domain overvoltage protection circuit 103 may be connected to an output terminal of the inductive lightning protection device 100, and a second terminal of the second stage time domain overvoltage protection circuit 103 may be grounded.
The embodiment of the utility model provides a through with first order time domain overvoltage crowbar and the equal ground connection of second level time domain overvoltage crowbar, can carry out quick, effectual discharge to the response thunder electric energy that gets into the radio frequency link through radio frequency interface, can improve and respond to lightning protection's protective effect to the radio frequency communication electronic equipment who contains radio frequency interface.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An inductive lightning protection device for use in a radio frequency interface, comprising: the overvoltage protection circuit comprises a first-stage time domain overvoltage protection circuit, a frequency domain filter circuit and a second-stage time domain overvoltage protection circuit which are sequentially connected; the first-stage time domain overvoltage protection circuit is arranged at the input end of the induction lightning protection device; the second-stage time domain overvoltage protection circuit is arranged at the output end of the induction lightning protection device.
2. The inductive lightning protection device applied to a radio frequency interface of claim 1, wherein the first stage time domain overvoltage protection circuit comprises a gas discharge tube.
3. The inductive lightning protection device applied to a radio frequency interface of claim 1, wherein the second stage time domain overvoltage protection circuit comprises a transient voltage suppression diode.
4. The inductive lightning protection device applied to a radio frequency interface according to claim 1, wherein the frequency domain filter circuit comprises a high pass filter and a low pass filter connected to each other; the high-pass filter is connected with the first-stage time domain overvoltage protection circuit; and the low-pass filter is connected with the second-stage time domain overvoltage protection circuit.
5. The inductive lightning protection device applied to a radio frequency interface of claim 1, wherein the frequency domain filter circuit comprises a band pass filter; the band-pass filter is respectively connected with the first-stage time domain overvoltage protection circuit and the second-stage time domain overvoltage protection circuit.
6. The inductive lightning protection device applied to a radio frequency interface according to claim 4, wherein the high pass filter is a fifth order LC high pass filter.
7. The inductive lightning protection device applied to a radio frequency interface according to claim 6, wherein the high pass filter comprises: the inductor comprises a first inductor, a second inductor, a third inductor, a first capacitor and a second capacitor;
the first end of the first inductor is connected with the first end of the first capacitor; the second end of the first inductor is connected with the second end of the second inductor and the second end of the third inductor; the second end of the first capacitor is connected with the first end of the second inductor and the first end of the second capacitor; the second end of the second capacitor is connected with the first end of the third inductor.
8. The inductive lightning protection device applied to a radio frequency interface according to claim 4, wherein the low pass filter is a fifth order LC low pass filter.
9. The inductive lightning protection device applied to a radio frequency interface according to claim 8, wherein the low pass filter comprises: a fourth inductor, a fifth inductor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the third capacitor is connected with the first end of the fourth inductor; a second end of the third capacitor is connected with a second end of the fourth capacitor and a second end of the fifth capacitor; a second end of the fourth inductor is connected to a first end of the fourth capacitor and a first end of the fifth inductor; the second end of the fifth inductor is connected with the first end of the fifth capacitor.
10. The inductive lightning protection device applied to a radio frequency interface according to any one of claims 1 to 9, wherein the first stage time domain overvoltage protection circuit and the second stage time domain overvoltage protection circuit are both grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221537106.1U CN217642717U (en) | 2022-06-17 | 2022-06-17 | Induction lightning protection device applied to radio frequency interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221537106.1U CN217642717U (en) | 2022-06-17 | 2022-06-17 | Induction lightning protection device applied to radio frequency interface |
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| CN217642717U true CN217642717U (en) | 2022-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116093912A (en) * | 2023-04-03 | 2023-05-09 | 江苏应能微电子股份有限公司 | Voltage clamping combined device |
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2022
- 2022-06-17 CN CN202221537106.1U patent/CN217642717U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116093912A (en) * | 2023-04-03 | 2023-05-09 | 江苏应能微电子股份有限公司 | Voltage clamping combined device |
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