CN202268694U - Lightning surge protection circuit applied to digital microwave transceiver - Google Patents
Lightning surge protection circuit applied to digital microwave transceiver Download PDFInfo
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- CN202268694U CN202268694U CN2011204076995U CN201120407699U CN202268694U CN 202268694 U CN202268694 U CN 202268694U CN 2011204076995 U CN2011204076995 U CN 2011204076995U CN 201120407699 U CN201120407699 U CN 201120407699U CN 202268694 U CN202268694 U CN 202268694U
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- lightning surge
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- digital microwave
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Abstract
The utility model discloses a lightning surge protection circuit applied to a digital microwave transceiver. The lightning surge protection circuit comprises a primary protection circuit and a secondary protection circuit, wherein the primary and secondary protection circuits are connected through an inductor. The lightning surge protection circuit further comprises a self-recovery voltage dependent resistor which is connected in series with a gas discharge tube. The lightning surge protection circuit adopts the self-recovery voltage dependent resistor instead of a voltage dependent resistor in the prior art, so that residual voltage in the circuit is eliminated by utilizing the characteristics of the self-recovery voltage dependent resistor, the pressure of a post stage of the circuit is effectively decreased, and the circuit is protected. By the lightning surge protection circuit, the residual voltage in the circuit is eliminated, surge impact on the post stage of the circuit is effectively reduced, and the circuit is protected from damage.
Description
Technical field
The utility model relates to the technical field of digital microwave, particularly a kind of lightning surge protective circuit that is applied to the digital microwave transceiver.
Background technology
At present, the anti-surge protection circuit that is applied on the outdoor communication equipment generally is connected on the input supply terminal mouth of equipment, and in the voltage range that can bear the equipment that is limited in by the thunderbolt or the instantaneous surge voltage of indirect lightning strike, protection equipment is not hit and damages.
Anti-surge protection circuit generally is made up of dual-electrode protecting circuit, and the power supply of outdoor communication equipment is direct current (a 48V communication power supply), is generally provided by indoor equipment.Fig. 1 is an anti-surge protection circuit of the prior art; The power input mouth is when voltage is in normal condition; The principle of first class of protection circuit is: gas discharge tube GDT (Gas Discharge Tube) and piezo-resistance MOV (Metal Oxide Varistor) are in high-impedance state, and the D.C. resistance of inductance L is very little when direct current.The principle of second class protection circuit is: transient voltage restraining diode TVS (Transient Voltage Suppression) does not puncture power supply (VBR) so protective circuit can not influence the operate as normal of digital microwave transceiver ODU because the circuit input voltage reaches it; When the surge voltage because of thunderbolt or the instantaneous generation of voltage appears in the power input mouth; Because the response time of TVS pipe is extremely short; Be merely 1.0ps (psec); When surge voltage reaches the puncture voltage of TVS, during starting resistor V1, this TVS voltage with clamper at V1; Meanwhile; Inductance L is along with the variation of the surge current that passes through produces inverse electromotive force and is loaded into gas discharge tube GDT and piezo-resistance MOV two ends; When the voltage V2 at GDT and MOV two ends is enough to the gas breakdown discharge tube (annotating GDT and MOV response time is the ns level); This two device will transfer low resistance state to from high-impedance state, and surge is released.
But; The first order by gas discharge tube GDT and piezo-resistance are formed protects the residual voltage of potential circuit very high; General above 300V, and the clamp voltage of second level protection circuit generally is no more than 100V, thus cause that first order residual voltage continues the surge impact to second level protection circuit and late-class circuit; Finish up to surge, all can impact the reliability and stability of entire circuit.
The utility model content
The shortcoming that the purpose of the utility model is to overcome prior art provides a kind of lightning surge protective circuit that is applied to the digital microwave transceiver with not enough, reduces the infringement that surge voltage causes to circuit.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of lightning surge protective circuit that is applied to the digital microwave transceiver; Comprise first class of protection circuit and second class protection circuit; Connect with inductance between said first class of protection circuit and the second class protection circuit; Also comprise from recovering thermistor, said from recovering thermistor and gas discharge tube is connected in series.
Preferably, said from recovering thermistor employing PTC material.
Preferably, flow through when the electric current that recovers thermistor reaches the device nominal threshold value, the polymer material heating is expanded, and resistance value becomes high-impedance state by low resistance state.
Preferably, saidly after recovering the overcurrent of thermistor in circuit and eliminating, revert to low resistance state by high-impedance state, resistance value reverts to low resistance state by high-impedance state.
Preferably, said first class of protection circuit comprises gas discharge tube.
Preferably, the said second class protection circuit transient voltage restraining diode parallelly connected with the first class of protection circuit.
The utility model has following advantage and effect with respect to prior art:
The utility model anti-surge protection circuit adopts from recovering thermistor and replaces piezo-resistance of the prior art, utilizes from the characteristic of recovering thermistor, has reduced the pressure of level behind the circuit effectively, has protected circuit.
Description of drawings
Fig. 1 is a surge protection circuit schematic diagram in the prior art;
Fig. 2 is the utility model surge protection circuit schematic diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the execution mode of the utility model is not limited thereto.
Embodiment
As shown in Figure 2; Present embodiment is applied to the lightning surge protective circuit of digital microwave transceiver, comprises first class of protection circuit and second class protection circuit, and said first class of protection circuit comprises gas discharge tube; Said second class protection circuit comprises the transient voltage restraining diode parallelly connected with the first class of protection circuit; Connect with inductance between said first class of protection circuit and the second class protection circuit, also comprise from recovering thermistor, said from recovering thermistor and gas discharge tube is connected in series.
Said recovering thermistor PTC is called resettable fuse again certainly, and this device adopts based on unleaded polymeric positive temperature coefficient PTC (Positive Temperature Coefficient) material, and the protection electric circuit is avoided the overcurrent infringement.In normal operation, the charcoal passage in the condensate can conduct electricity device.When the electric current of the PTC that flows through reached the device nominal threshold value, the polymer material heating was expanded, and the result of expansion makes the fracture of charcoal chain, makes the electric current of the circuit of flowing through be reduced to very little Leakage Current.Resettable fuse resistance increases, and limits deleterious current, thereby reaches the purpose of protective circuit.After (fault) overcurrent in the circuit is eliminated, PTC will automatically reset, and revert to low resistance state by high-impedance state.
The utility model utilization is from the characteristic of recovering thermistor PTC; When the power input mouth when voltage is in normal condition; Gas discharge tube GDT in the first class of protection circuit and recover thermistor PTC series connection certainly and be in high-impedance state; The D.C. resistance of inductance L is very little when direct current, at this moment the transient voltage restraining diode TVS digital microwave transceiver ODU operate as normal of second class protection circuit.
And when the surge voltage because of thunderbolt or the instantaneous generation of voltage appears in the power input mouth, when surge voltage reaches the puncture voltage of TVS, this TVS voltage with clamper about 121V.Meanwhile, inductance L is along with the variation of voltage produces inverse electromotive force, when the surge voltage of input continues to increase; When reaching gas discharge tube GDT threshold voltage, this two series connection device will transfer low resistance state to from high-impedance state, and surge voltage is released; When surge voltage flow through after recover thermistor PTC (surge voltage flow through time of PTC be the ms Millisecond); PTC becomes high resistant by low-resistance, makes this series via be in off-state, and no longer exist residual voltage on this two end node this moment; Thereby reduced the pressure of level behind the circuit effectively, protected circuit.
The foregoing description is the utility model preferred implementation; But the execution mode of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection range of the utility model.
Claims (6)
1. lightning surge protective circuit that is applied to the digital microwave transceiver; Comprise first class of protection circuit and second class protection circuit; Connect with inductance between said first class of protection circuit and the second class protection circuit; It is characterized in that, also comprise from recovering thermistor, said from recovering thermistor and gas discharge tube is connected in series.
2. the lightning surge protective circuit that is applied to the digital microwave transceiver according to claim 1 is characterized in that, and is said from recovering thermistor employing PTC material.
3. the lightning surge protective circuit that is applied to the digital microwave transceiver according to claim 1; It is characterized in that; Flow through when the electric current that recovers thermistor reaches the device nominal threshold value, the polymer material heating is expanded, and resistance value becomes high-impedance state by low resistance state.
4. the lightning surge protective circuit that is applied to the digital microwave transceiver according to claim 1 is characterized in that, said after recovering the overcurrent elimination of thermistor in circuit, resistance value reverts to low resistance state by high-impedance state.
5. the lightning surge protective circuit that is applied to the digital microwave transceiver according to claim 1 is characterized in that said first class of protection circuit comprises gas discharge tube.
6. the lightning surge protective circuit that is applied to the digital microwave transceiver according to claim 1 is characterized in that, the transient voltage restraining diode that said second class protection circuit is parallelly connected with the first class of protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204076995U CN202268694U (en) | 2011-10-24 | 2011-10-24 | Lightning surge protection circuit applied to digital microwave transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204076995U CN202268694U (en) | 2011-10-24 | 2011-10-24 | Lightning surge protection circuit applied to digital microwave transceiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202268694U true CN202268694U (en) | 2012-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204076995U Expired - Fee Related CN202268694U (en) | 2011-10-24 | 2011-10-24 | Lightning surge protection circuit applied to digital microwave transceiver |
Country Status (1)
| Country | Link |
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| CN (1) | CN202268694U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739027A (en) * | 2012-06-26 | 2012-10-17 | 深圳英飞拓科技股份有限公司 | Protective circuit for DC (direct current) power supply interface of 24V |
| WO2013178168A1 (en) * | 2012-08-23 | 2013-12-05 | 中兴通讯股份有限公司 | Protective apparatus of gas discharge tube and communication device |
| CN105763270A (en) * | 2016-05-18 | 2016-07-13 | 成都福兰特电子技术股份有限公司 | Data acquisition system for monitoring and positioning aerial wireless interference signals |
| CN106159926A (en) * | 2016-06-29 | 2016-11-23 | 四川中光防雷科技股份有限公司 | A kind of surge protection circuit and Surge Protector |
| CN110729771A (en) * | 2019-10-28 | 2020-01-24 | 许继电气股份有限公司 | Self-powered device |
| CN110783906A (en) * | 2018-07-26 | 2020-02-11 | Ripd知识产权发展有限公司 | Surge protection device, circuit, module and system comprising surge protection device, circuit and module |
-
2011
- 2011-10-24 CN CN2011204076995U patent/CN202268694U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739027A (en) * | 2012-06-26 | 2012-10-17 | 深圳英飞拓科技股份有限公司 | Protective circuit for DC (direct current) power supply interface of 24V |
| WO2013178168A1 (en) * | 2012-08-23 | 2013-12-05 | 中兴通讯股份有限公司 | Protective apparatus of gas discharge tube and communication device |
| CN105763270A (en) * | 2016-05-18 | 2016-07-13 | 成都福兰特电子技术股份有限公司 | Data acquisition system for monitoring and positioning aerial wireless interference signals |
| CN106159926A (en) * | 2016-06-29 | 2016-11-23 | 四川中光防雷科技股份有限公司 | A kind of surge protection circuit and Surge Protector |
| WO2018000791A1 (en) * | 2016-06-29 | 2018-01-04 | 四川中光防雷科技股份有限公司 | Surge protection circuit and surge protective device |
| CN106159926B (en) * | 2016-06-29 | 2019-01-15 | 四川中光防雷科技股份有限公司 | A kind of surge protection circuit and Surge Protector |
| CN110783906A (en) * | 2018-07-26 | 2020-02-11 | Ripd知识产权发展有限公司 | Surge protection device, circuit, module and system comprising surge protection device, circuit and module |
| CN110729771A (en) * | 2019-10-28 | 2020-01-24 | 许继电气股份有限公司 | Self-powered device |
| CN110729771B (en) * | 2019-10-28 | 2020-12-15 | 许继电气股份有限公司 | Self-powered device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120606 Termination date: 20131024 |