CN206099326U - Lightning protection circuit that broadband undershoot decreased - Google Patents
Lightning protection circuit that broadband undershoot decreased Download PDFInfo
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- CN206099326U CN206099326U CN201621042290.7U CN201621042290U CN206099326U CN 206099326 U CN206099326 U CN 206099326U CN 201621042290 U CN201621042290 U CN 201621042290U CN 206099326 U CN206099326 U CN 206099326U
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Abstract
The utility model discloses a lightning protection circuit that broadband undershoot decreased, including the discharging material silo circuit that is used for restraining radiofrequency signal, an ultralow poor circuit that decreases in broadband for being directed at AISG signal transmission, a rear end protection circuit for releasing lightning current protects follow -up circuit, the discharging material silo circuit is connected with the antenna end mouth, and the AISG signal is directly put through to the low poor circuit that decreases, and the rear end protection circuit directly is connected with the direct current end, and discharging material silo circuit, the low poor radio frequency bypass of decreasing circuit and rear end protection circuit are held with ground respectively and be connected, and circuit connection is protected with discharging material silo circuit and rear end again simultaneously to the low poor circuit that decreases. The utility model discloses utilize the capacitance effect of TVS pipe, build a 2M~12M AISG's low difference and decrease the circuit to realize the function of lightning protection and transmission AISG signal high -efficiently. Save two power diode, saved the PCB area, in the time of reduce cost, especially realized the ultralow poor difunctional promotion of decreasing in broadband of AISG signal.
Description
Technical field
This utility model is related to field of mobile communication, more particularly to a kind of lightning protection circuit of base station.
Background technology
Due to mobile communication base station geographical position, surrounding enviroment it is special, therefore, base station system is easily affected by thunderbolt.And move
Dynamic communication base station system back-end circuit is particularly important, and in order to protect back-end circuit from broken by lightning, lightning-protection module is entirely leading to
It is an indispensable part in letter system.Another function of lightning-protection module is then to the effective of AISG (antennal interface standard) signal
Transmission.
Just current common lightning protection circuit is frequently with gas-discharge tube, decoupling resistor, TVS pipe (Transient Voltage
Suppression transient voltage suppressors) three-level protection structure.Its operation principle is：Lightning strike signals are entered by antenna opening
When entering lightning protection circuit, because the response time of gas-discharge tube is generally hundreds of ns, therefore, when gas-discharge tube does not work it
Before, current signal can pass through gas-discharge tube subsequent conditioning circuit.It is PS ranks, in gas because the response time of TVS pipe is very fast
Before body discharge tube does not work, TVS pipe bears main power consumption, after gas-discharge tube work, the thunder of the overwhelming majority
Hitting electric current can be released by gas-discharge tube, and the purpose of lightning protection is reached with this.
In terms of effective transmission of AISG signals.The interelectrode capacity of gas-discharge tube is generally less than 5pF, and this is believed AISG
Number decay very little.But TVS pipe presents capacity effect in the case of direct current energization.Now capacitor value is presented to AISG signals
For Xc=1/ (the 2 π fC) Ω of ≈ 73.2.It is individually connected in parallel on circuit, and a destructive decay will be produced to AISG signals.
In order to solve the huge decay of the capacity effect to AISG signals of TVS pipe, at present common method is to connect one before TVS pipe
The high-power fast recovery diode of individual capacity effect very little, the capacity effect presented in 2.176M frequencies of this diode is about
For 1pF, then total capacitance C=(C1*C2)/(C1+C2) ≈ 1pF now.This decay to AISG signals can be described as it is micro- its
It is micro-.Simultaneously, it is contemplated that during lightning strike protection, the transmission of negative polarity lightning strike signals, in addition it is also necessary to which parallel connection one is reversely big on circuit
Power fast diode.Its circuit is as shown in Figure 1.
Although above-mentioned common methods are while lightning protection effect is ensured, it is also possible to biography of effective realization to AISG signals
It is defeated.But the frequency band of AISG signals is narrow, generally less than 3Mhz, and employ two high-power fast diodes increased cost and
PCB surface is accumulated, and in principle, a multiplex device, the risk of reliability failures can accordingly increase, and the structure of whole circuit is relatively multiple
Miscellaneous, reliability is relatively low, and cost is also also improved.
Utility model content
For weak point present in above-mentioned technology, this utility model provides a kind of simple structure, small volume, reliability
High broadband, filter with low insertion loss, the lightning protection circuit of high request.
For achieving the above object, this utility model provides a kind of lightning protection circuit of wide frequency band low insertion loss, including：
For the Signal Matching circuit for leading to direct current and AISG signals, suppressing radiofrequency signal；
For by AISG signals, expanding the low difference that circuit causes in passband to be low differential loss to the transmission band of AISG signals
Damage circuit；
For thunder-strike current of releasing, the rear terminal protecting circuit that thunderbolt residual voltage protects subsequent conditioning circuit is limited；
The Signal Matching circuit is connected with antenna port, and the low differential loss circuit directly connects AISG signals, it is described after
Terminal protecting circuit is directly connected with DC terminal, the Signal Matching circuit, low differential loss circuit and rear terminal protecting circuit respectively with ground
End connection, and the low differential loss circuit with Signal Matching circuit and rear terminal protecting circuit again while be connected.
Wherein, the Signal Matching circuit includes choking-winding inductance, gas-discharge tube and the first electric capacity, and described first is electric
Hold and connect with choking-winding inductance after gas-discharge tube parallel connection, the choking-winding inductance is connected with antenna, and the gas is put
Fulgurite and the first electric capacity are also grounded simultaneously.
Wherein, the low differential loss circuit includes wire-wound inductor, the second electric capacity and the 3rd electric capacity, second capacitance connection
AISG signals, second electric capacity is connected respectively with the 3rd electric capacity and wire-wound inductor, and the wire-wound inductor is also electric with Signal Matching
Road and rear terminal protecting circuit connect, and the 3rd electric capacity is also grounded.
Wherein, the rear terminal protecting circuit includes high-power inductance, power resistor and TVS pipe；The high-power inductance is
UH levels, described high-power inductance one end is connected with low differential loss circuit and Signal Matching circuit, and the other end is connected with power resistor, institute
Power resistor is stated also while being connected with TVS pipe and DC terminal, described TVS pipe one end is connected with DC terminal and power resistor, another
End is connected with ground terminal.
Wherein, first electric capacity adopts higfh-tension ceramics electric capacity, second electric capacity and the 3rd electric capacity to adopt ceramic paster
Electric capacity.
Wherein, the TVS pipe is the high-power unidirectional TVS pipes of 5000W.
Wherein, the gas-discharge tube adopts the paster gas-discharge tube of 20kA ranks.
The beneficial effects of the utility model are：This utility model is for the big thunderbolt letter of 10/350us time length, energy
Number, the current peak of this lightning strike signals is ± 5kA.Using the high-power inductance of uH ranks in this practicality, when thunder-strike current is entered
It is the rapidly variable-current of a moment during lightning protection part, inductance will produce inverse electromotive force, and inverse electromotive force resists thunderbolt
Electric current passes through, and has reached the effect of protection circuit, meanwhile, high-power inductance itself has certain resistance, can bear a part
Power.In addition, power resistor plays a part of protection and current limliting to base station system back-end circuit.Lightning protection effect of the present utility model
More general lightning-protection system is compared, big electric current can be resisted, circuit structure is relatively easy.
Ordinary circumstance, under the thousand pf electric capacity presented under TVS pipe unidirectional current, the AISG signals of carrier signal 2.176M are produced
Raw big decay, using power diode the capacitive phenomena that TVS pipe is produced is offset.This approach increases making for power diode
With, but the AISG signal bandwidths that can pass through only 2.176M ± 1.5M, Insertion Loss are 0.6dB.The AISG signals for passing through lead to
With the pcb board area that narrow, Insertion Loss is big and high cost, occupancy are more.But this utility model, do not increasing power diode
Under the premise of, both saved cost, reduced pcb board face product by currently existing scheme, also cause AISG signal bandwidths to expand as 2M
～12M, differential loss can be controlled within 0.3dB.Comprehensive Correlation, the design is either respectively provided with cost or practical application
Very big advantage, especially realizes the difunctional lifting of the ultralow differential loss in broadband of AISG signals.
Description of the drawings
Fig. 1 is common counteracting TVS capacity effect circuit diagrams；
Fig. 2 is intended to for the lightning protection circuit schematic diagram of this utility model embodiment；
Fig. 3 is the Bias-T lightning protection circuit schematic diagrams of this utility model embodiment；
Fig. 4 is this utility model embodiment OOK signal equivalent simulation schematic diagram；
Fig. 5 is this utility model embodiment based on the curve chart under S (2,1) state of Fig. 4；
Fig. 6 is this utility model embodiment based on the curve chart under S (1,1) state of Fig. 4；
Fig. 7 is this utility model embodiment Network Analyzer measured result.
Specific embodiment
In order to more clearly state this utility model, this utility model is further described below in conjunction with the accompanying drawings.
Fig. 2 is referred to, this utility model provides a kind of lightning protection circuit of wide frequency band low insertion loss, including：
For the Signal Matching circuit for leading to direct current and AISG signals, suppressing radiofrequency signal；
For by AISG signals, expanding the low difference that circuit causes in passband to be low differential loss to the transmission band of AISG signals
Damage circuit；
For thunder-strike current of releasing, the rear terminal protecting circuit that thunderbolt residual voltage protects subsequent conditioning circuit is limited；
Signal Matching circuit is connected with antenna port, and low differential loss circuit directly connects AISG signals, and rear terminal protecting circuit is straight
Connect and be connected with DC terminal, Signal Matching circuit, low differential loss circuit and rear terminal protecting circuit are connected respectively with ground terminal, and low differential loss electricity
Road is connected with Signal Matching circuit and rear terminal protecting circuit simultaneously again.
Fig. 3 is referred to, in the present embodiment, AISG signals adopt 2.176M sinusoidal carriers, on-off keying (OOK) to modulate,
Specific connected mode is that Signal Matching circuit includes choking-winding inductance L1, gas-discharge tube G1 and the first electric capacity C1, its
In, choking-winding inductance L1 has five circles, and Main Function is logical direct current and OOK signals, and improves circuit to wave filter radiofrequency signal
Suppression, Irms>5A, it is desirable to primarily serve the purpose of to thunder-strike current signal by effectively being delayed, bear part thunderbolt
Power；First electric capacity C1 is 3.9～100pF higfh-tension ceramics electric capacity, concrete capacitance and filter passband frequency dependence, mainly
Effect is to coordinate choking-winding inductance L1, using 2～6 circle coiled wire-wound coil rejects trap radiofrequency signals, concrete inductance value and filter
Ripple device band connection frequency is related, reduces the impact that Bias-T circuits are caused to wave filter；Gas-discharge tube G1 is paster gas discharge
Pipe, model 2RP090M-8S, 20kA ranks；In the present embodiment, after the first electric capacity C1 is in parallel with gas-discharge tube G1 with grip
Stream coil inductance L1 series connection, choking-winding inductance L1 is connected with ANT mobile jibs, and gas-discharge tube G1 and the first electric capacity C1 also connects simultaneously
Ground.
Low differential loss circuit includes wire-wound inductor L2, the second electric capacity C2 and the 3rd electric capacity C3, and wire-wound inductor L2 is one kind
0.39uH chip inductors, Main Function is, by OOK signals, to expand transmission band of the circuit to OOK signals so that be in passband
Low differential loss, the second electric capacity C2 and the 3rd electric capacity C3 is ceramic paster electric capacity, and the second electric capacity C2 capacitances are 4.7NF, the 3rd electric capacity C3
Capacitance 100pF, Main Function is, by AISG signals, to expand transmission band of the circuit to AISG signals；Second electric capacity C2 connects
AISG signals, the second electric capacity C2 is connected respectively with the 3rd electric capacity C3 and wire-wound inductor L2, wire-wound inductor L2 also with power inductance L3
Connect with choking-winding inductance L1, the 3rd electric capacity C3 is also grounded.
Afterwards terminal protecting circuit includes high-power inductance L3, power resistor RES and TVS pipe U1；High-power inductance L3 uses patch
Piece inductance, inductance value is 2.2uH, Irms>5A, it is desirable to primarily serve the purpose of to thunder-strike current signal by effectively being delayed,
Part thunderbolt power is born, power resistor RES is 0.5 Ω, the thunderbolt letter longer for the 10/350us this times, energy is larger
Number, increase suitably decoupling resistor, can be used in current limliting and protection late-class circuit, TVS pipe U1 adopts 5000W models
The transition diode of 5.0SMDJ33A, Main Function is that residual voltage of being struck by lightning is limited, and protects the normal work of subsequent conditioning circuit.
In the present embodiment, high-power inductance L3 one end is connected with wire-wound inductor L2 and choking-winding inductance L1, the other end and power resistor
RES connects, and power resistor RES also be connected with TVS pipe U1 and DC terminal DC simultaneously, TVS pipe U1 one end and DC terminal DC and power
Resistance RES connects, and the other end is connected with ground terminal.
AISG protocol requirement direct current supplys voltage range is 12～30V, in the present embodiment, Bias-T lightning protection circuit passages
Differential loss<0.4dB, return loss<- 12dB, lightning protection is required：10/350us, 5kA, residual voltage requirement+60V/-6V, the Bias-T of the present embodiment
Lightning protection circuit schematic diagram is as shown in Fig. 3：
The sensing overcurrent analog waveform produced on cable when 10/350us dash currents are thunderbolt, lightning strike signals pass through day
When line mouth enters Bias-T lightning protection circuits, because the response time of gas-discharge tube G1 is generally hundreds of ns, impact flashover voltage
Generally higher than 600V.Therefore, before gas-discharge tube G1 does not work, current signal can be subsequently electric by gas-discharge tube G1
Road, we are substituted using the high-power inductance L3 of 22uH and 0.5 Ω power resistors RES.On the one hand, thunder-strike current enters lightning protection part
When, it is the rapidly variable-current of a moment, inductance will produce inverse electromotive force, and inverse electromotive force is resisted thunder-strike current and led to
Cross, reached the effect of protection circuit, at the same time, high-power inductance L3 itself has certain resistance together with decoupling resistor
Play a part of to bear part current power.Final stage lightning protection, the design adopts high-power unidirectional TVS pipes 5.0SMDJ33A of 5000W,
It is PS ranks because the response time of TVS pipe U1 is very fast, before gas-discharge tube does not work, TVS pipe U1 is born mainly
Power consumption, and in the moment of us levels, TVS pipe U1 can bear the transient power more than more than 10KW.
In order to verify the ruuning situation of this circuit, spy is emulated by software, and Fig. 4 is OOK signal equivalent simulation principles
Figure, Fig. 5 and Fig. 6 is respectively DB, and ((curve synoptic diagram under S (1,1)) state, in DB, (in S (2,1)), m1 is S (2,1)) with DB
In simulation curve, OKK signal of the frequency under 20.MHZ, m2 is the OKK signals of frequency 11.5MHZ in simulation curve, and m3 is imitative
True curve medium frequency is the OKK signals of 9.922MHZ, and in Fig. 6, in DB, (under S (1,1)) state, m11 is frequency 2.0MHZ's
OKK signals, m22 is OKK signal of the frequency in 12.0MHZ.And Fig. 7 is the Network Analyzer experimental result of side circuit, at this
In embodiment, 2～12M differential losses<0.3dB, port return loss>20dB, while index request is met, also stays to produce in enormous quantities
Sufficient surplus much of that.For present situation, the schemes of prevention against lightning of the design is electric using gas-discharge tube+power in principle
The scheme of 4 grades of circuits of sense+decoupling resistor+TVS pipe realizes lightning protection measures.This design cost is low, device is few, with better function, device
The space distribution of part is flexible.
This scheme goes in different thunder-strike prevention standards, for example 8/20us, 10/350us, 10/1000us, can be with
Reach a kind of schemes of prevention against lightning to be applied in various different lightning-protection systems.
Advantage of the present utility model is：
1) avoid by power diode to offset the capacity effect of TVS pipe in this utility model, to realize to AISG
The thinking set of effective transmission of signal, does not remove the capacity effect for focusing on how offsetting TVS, but using the electric capacity effect
Should, the low differential loss circuit of 2M～12M AISG is built, so as to not only simple but also efficiently realize lightning protection and transmission AISG signals
Function, compared with conventional method, save two power diodes, save PCB surface product, while reduces cost, function
Also it is further enhanced；Especially realize the difunctional lifting of the ultralow differential loss in broadband of AISG signals.
2) it is a moment when thunder-strike current enters lightning protection part using the high-power inductance of uH ranks in this practicality
Rapidly variable-current, inductance will produce inverse electromotive force, and inverse electromotive force is resisted thunder-strike current and passed through, after having reached protection
The effect of level circuit；
3) power resistor plays a part of protection and current limliting, lightning protection effect of the present utility model to base station system back-end circuit
More general lightning-protection system is compared, big electric current can be resisted, circuit structure is relatively easy.
Disclosed above is only several specific embodiments of the present utility model, but this utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into protection domain of the present utility model.
Claims (7)
1. a kind of lightning protection circuit of wide frequency band low insertion loss, it is characterised in that include：
For the Signal Matching circuit for leading to direct current and AISG signals, suppressing radiofrequency signal；
For the low differential loss electricity for causing in passband to be low differential loss to the transmission band of AISG signals by AISG signals, expansion circuit
Road；
For thunder-strike current of releasing, the rear terminal protecting circuit that thunderbolt residual voltage protects subsequent conditioning circuit is limited；
The Signal Matching circuit is connected with antenna port, and the low differential loss circuit directly connects AISG signals, and the rear end is protected
Protection circuit is directly connected with DC terminal, and the Signal Matching circuit, low differential loss circuit and rear terminal protecting circuit connect respectively with ground terminal
Connect, and the low differential loss circuit is connected with Signal Matching circuit and rear terminal protecting circuit simultaneously again.
2. a kind of lightning protection circuit of wide frequency band low insertion loss according to claim 1, it is characterised in that the Signal Matching electricity
Road includes choking-winding inductance, gas-discharge tube and the first electric capacity, with chokes after first electric capacity is in parallel with gas-discharge tube
Coil inductance is connected, and the choking-winding inductance is connected with antenna port, and the gas-discharge tube and the first electric capacity also connect simultaneously
Ground.
3. a kind of lightning protection circuit of wide frequency band low insertion loss according to claim 2, it is characterised in that the low differential loss circuit
Including wire-wound inductor, the second electric capacity and the 3rd electric capacity, the second capacitance connection AISG signal, second electric capacity is respectively with
Three electric capacity and wire-wound inductor connect, and the wire-wound inductor is also connected with Signal Matching circuit and rear terminal protecting circuit, and the described 3rd
Electric capacity is also grounded.
4. a kind of lightning protection circuit of wide frequency band low insertion loss according to claim 3, it is characterised in that the rear end protection electricity
Road includes high-power inductance, power resistor and TVS pipe；The high-power inductance be uH levels, described high-power inductance one end with it is low
Differential loss circuit and Signal Matching circuit connect, and the other end be connected with power resistor, the power resistor also and meanwhile with TVS pipe and directly
Stream end connection, described TVS pipe one end is connected with DC terminal and power resistor, and the other end is connected with ground terminal.
5. the lightning protection circuit of a kind of wide frequency band low insertion loss according to claim 4, it is characterised in that first electric capacity is adopted
Higfh-tension ceramics electric capacity, second electric capacity and the 3rd electric capacity is used to adopt ceramic paster electric capacity.
6. the lightning protection circuit of a kind of wide frequency band low insertion loss according to claim 4, it is characterised in that the TVS pipe is
The high-power unidirectional TVS pipes of 5000W.
7. a kind of lightning protection circuit of wide frequency band low insertion loss according to claim 2, it is characterised in that the gas-discharge tube
Using the paster gas-discharge tube of 20kA ranks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621042290.7U CN206099326U (en) | 2016-09-07 | 2016-09-07 | Lightning protection circuit that broadband undershoot decreased |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621042290.7U CN206099326U (en) | 2016-09-07 | 2016-09-07 | Lightning protection circuit that broadband undershoot decreased |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099326U true CN206099326U (en) | 2017-04-12 |
Family
ID=58476223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621042290.7U Active CN206099326U (en) | 2016-09-07 | 2016-09-07 | Lightning protection circuit that broadband undershoot decreased |
Country Status (1)
| Country | Link |
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| CN (1) | CN206099326U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473958A (en) * | 2017-09-08 | 2019-03-15 | 深圳创维数字技术有限公司 | A kind of lightning protection circuit and electrical equipment |
| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
-
2016
- 2016-09-07 CN CN201621042290.7U patent/CN206099326U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473958A (en) * | 2017-09-08 | 2019-03-15 | 深圳创维数字技术有限公司 | A kind of lightning protection circuit and electrical equipment |
| CN109473958B (en) * | 2017-09-08 | 2023-11-21 | 深圳创维数字技术有限公司 | Lightning protection circuit and electrical equipment |
| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
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