CN203553313U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
- Publication number
- CN203553313U CN203553313U CN201320653273.7U CN201320653273U CN203553313U CN 203553313 U CN203553313 U CN 203553313U CN 201320653273 U CN201320653273 U CN 201320653273U CN 203553313 U CN203553313 U CN 203553313U
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- Prior art keywords
- quarter
- wave
- short
- protection circuit
- transmission line
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- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 238000004891 communication Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 11
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The utility model discloses a surge protection circuit applied to any multi-frequency band wireless communication equipment and antennas. The surge protection circuit comprises a quarter-wave short-circuiter and at least one short-wavelength quarter-wave branch line, each short-wavelength quarter-wave branch line is connected with the quarter-wave short-circuiter, and the quarter-wave short-circuiter is connected between a main transmission line and the ground; and the main transmission line is in an open circuit state, and DC and low-frequency surge currents are ensured to be kept away from electronic equipment and return back to the ground. Signals get in and out without losses at every designed frequency range. By utilization of the technical scheme, the protection circuit can operate at multi-frequency band when high current impact can be borne, and the surge protection circuit is prepared by printed boards without additional cost.
Description
Technical field
The utility model relates to wireless communication field, relates in particular to a kind of surge protection circuit.
Background technology
On the coaxial cable access interface of various Wireless Telecom Equipments, all need to arrange a protective circuit, for example, when large electric current, high-voltage pulse signal (thunderbolt) input, can prevent from burning out the components and parts in high-frequency circuit.
In one-segment circuit, protective circuit is configured to a quarter-wave short-circuiting device, corresponding a certain frequency range.But in multiband circuit, above-mentioned quarter-wave short-circuiting device is inapplicable, can cause wideband circuit insertion loss too high.In prior art, generally use heavy-current inductor device as protective circuit, but so do except with high costs, insertion loss is equally also higher.
So, should need a kind of protective circuit, when can bear heavy current impact, can be operated in multiband, cost is cheap.
Utility model content
The purpose of this utility model is to provide a kind of protective circuit, can be operated in the wideband circuit of multiband, and its circuit part that is pcb board, without fringe cost.
The utility model discloses a kind of surge protection circuit; comprise: main transmission line and the peak low band being connected with described main transmission line or long wavelength's quarter-wave short-circuiting device; described surge protection circuit also comprises at least one short wavelength's quarter-wave branch line; described in each, short wavelength's quarter-wave branch line is connected with described quarter-wave short-circuiting device; and be not connected with described main transmission line; described quarter-wave short-circuiting device is equivalent to open circuit in the impedance of described main transmission line, for described main transmission line provides direct current and the low frequency signal loop with ground.
Preferably, described quarter-wave short-circuiting device and the corresponding different frequency range of short wavelength's quarter-wave branch line described in each.
Preferably, the frequency range that described in each, quarter-wave short circuit branch line is corresponding is all higher than frequency range corresponding to described quarter-wave short-circuiting device.
Preferably, described main transmission line is configured to connect the transmission line of Wireless Telecom Equipment input and output port.
Preferably, described main transmission line is configured to connect the transmission line of multiband aerial input and output port.
Preferably, described in each, the length of short wavelength short wavelength's quarter-wave branch line is passed through microwave circuit simulation calculation.
Adopt after technique scheme; than the protective circuit being formed by former four minutes wavelength short-circuiting devices, can only be operated in one-segment circuit; the protective circuit that in the utility model, quarter-wave short-circuiting device forms can be operated in multiband circuit; can bear large electric current; simultaneously; due to the novel quarter-wave short-circuiting device of the utility model part that is printed circuit board (PCB), without extra cost.
Accompanying drawing explanation
Fig. 1 is one-segment surge protection circuit schematic diagram in prior art;
Fig. 2 is one-segment quarter-wave short-circuiting device frequency and insertion loss graph of a relation in prior art;
Fig. 3 is the utility model multiband surge protection circuit circuit diagram;
Fig. 4 is quarter-wave short-circuiting device frequency and insertion loss graph of a relation in the utility model multiband surge protection circuit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, further set forth advantage of the present utility model.
Consulting Fig. 1, is the circuit diagram of quarter-wave short-circuiting device in prior art.In prior art surge protection circuit, comprise main transmission line and a quarter-wave short-circuiting device, quarter-wave short-circuiting device is connected with main transmission line.The corresponding a certain frequency range of this quarter-wave short-circuiting device, when this frequency range, quarter-wave short-circuiting device, in resonance condition, is consulted Fig. 2, at resonance frequency place, the insertion loss of transmission line is reduced to minimum (close to 0dB).From the frequency of Fig. 2 and insertion loss graph of a relation, find out, the insertion loss between main transmission line is only minimum at the resonance frequency place of this quarter-wave short-circuiting device.
Consult Fig. 3, for the utility model surge protection circuit circuit diagram, in this surge protection circuit, except quarter-wave short-circuiting device, also comprise at least one short wavelength's quarter-wave branch line, be connected with quarter-wave short-circuiting device, and be not connected with main transmission line, increase the impedance that the quarter-wave short-circuiting device after quarter-wave short circuit branch line presents at main transmission line end and be equivalent to open circuit, corresponding surge direct current and the short circuit of surge low frequency letter, thereby on main main transmission line, all high-frequency signals are straight-through, surge direct current and the short circuit of surge low frequency signal, enter the earth, finally play the effect of protective circuit.
In this preferred embodiment, totally 5, short wavelength's quarter-wave branch line, the quantity of actual quarter-wave short circuit branch line is not limited to this quantity, can determine concrete quantity according to bandwidth and bin width, bin width is larger, and needed short wavelength's quarter-wave branch line is more.In this protective circuit, the resonance frequency of quarter-wave short-circuiting device is f1, and the resonance frequency of other four short wavelength's quarter-wave branch lines is respectively f2, f3, f4 and f5.For making the can resonance frequency more of quarter-wave short-circuiting device in this embodiment, the resonance frequency f1 of this quarter-wave short-circuiting device and another four short wavelength's quarter-wave branch lines, f2, f3, f4 and f5 be not identical and f1<f2<f3<f4LEssT. LTssT.LTf5 all, the resonance frequency that is quarter-wave short-circuiting device is minimum, the resonance frequency that is greater than quarter-wave short-circuiting device all can arrange a quarter-wave short circuit branch line correspondence, make surge protection circuit all surge direct current and the short circuit of surge low frequency signal can be entered to the earth in different frequencies.Thus, the length of every short wavelength's quarter-wave branch line arranges equal difference.The concrete configuration of above length is determined by resonance frequency f2, f3, f4 and f5, can by microwave circuit emulation, calculate the exact value of length, guarantees the accuracy of the resonance frequency of each short wavelength's quarter-wave branch line.
Main transmission line can be configured to the transmission line that connects Wireless Telecom Equipment input and output port, also or connect the transmission line of multiband aerial input and output port.
Adopt after technique scheme; than the protective circuit being formed by former four minutes wavelength short-circuiting devices, can only be operated in one-segment circuit; the protective circuit that in the utility model, quarter-wave short-circuiting device forms can be operated in multiband circuit; can bear large electric current; simultaneously; due to the part that the novel quarter-wave short-circuiting device of the utility model is printed circuit board (PCB), without extra cost, cheap.
Should be noted that, embodiment of the present utility model has preferably implementation, and not the utility model is done to any type of restriction, any person skilled in art of being familiar with may utilize the technology contents change of above-mentioned announcement or be modified to the effective embodiment being equal to, in every case do not depart from the content of technical solutions of the utility model, any modification or equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (5)
1. a surge protection circuit; comprise: main transmission line and be connected to the quarter-wave short-circuiting device between described main transmission line and the earth; described quarter-wave short-circuiting device, for described main transmission line provides the loop of direct current and low frequency signal and the earth, is characterized in that:
Described surge protection circuit also comprises at least one short wavelength's quarter-wave branch line, and described in each, short wavelength's quarter-wave branch line is connected with described quarter-wave short-circuiting device, and is not connected with described main transmission line.
2. surge protection circuit as claimed in claim 1, is characterized in that: described quarter-wave short-circuiting device and the corresponding different frequency range of short wavelength's quarter-wave branch line described in each.
3. surge protection circuit as claimed in claim 2, is characterized in that: the frequency of the frequency range that described in each, quarter-wave short circuit branch line is corresponding is all higher than the frequency of frequency range corresponding to described quarter-wave short-circuiting device.
4. surge protection circuit as claimed in claim 1, is characterized in that: described main transmission line is configured to connect the transmission line of Wireless Telecom Equipment input and output port.
5. surge protection circuit as claimed in claim 1, is characterized in that: described main transmission line is configured to connect the transmission line of multiband aerial input and output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653273.7U CN203553313U (en) | 2013-10-22 | 2013-10-22 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653273.7U CN203553313U (en) | 2013-10-22 | 2013-10-22 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203553313U true CN203553313U (en) | 2014-04-16 |
Family
ID=50471388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320653273.7U Expired - Lifetime CN203553313U (en) | 2013-10-22 | 2013-10-22 | Surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203553313U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577271A (en) * | 2013-10-22 | 2015-04-29 | 芯迪半导体科技（上海）有限公司 | Surge protection circuit |
-
2013
- 2013-10-22 CN CN201320653273.7U patent/CN203553313U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577271A (en) * | 2013-10-22 | 2015-04-29 | 芯迪半导体科技（上海）有限公司 | Surge protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140416 |
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| CX01 | Expiry of patent term |