CN204316084U - A kind of novel lightning protecting circuit for intelligent electric energy meter - Google Patents
A kind of novel lightning protecting circuit for intelligent electric energy meter Download PDFInfo
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- CN204316084U CN204316084U CN201420850197.3U CN201420850197U CN204316084U CN 204316084 U CN204316084 U CN 204316084U CN 201420850197 U CN201420850197 U CN 201420850197U CN 204316084 U CN204316084 U CN 204316084U
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Abstract
The utility model provides a kind of novel lightning protecting circuit for intelligent electric energy meter, it adopts the compound lightning protection structure of two-stage, namely adopt gas discharge tube as first order lightning protection by input port, output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas discharge tubes, and carry out common mode protection respectively and protect with differential mode, through-current capability reaches 10kV/500A, voltage can be impaired to about 500V; Second level lightning protection is made up of thermistor PTC and TVS pipe, and thermistor plays metering function, and after the pressure limiting of TVS pipe secondary, voltage is clamped at about 6.8V, thus protects 485 modular circuits.It adopts the compound lightning protection structure of two-stage, in use really plays lightning protection effect, avoid deadlock that the factors such as thunderbolt cause, can not the problem such as remote meter reading.
Description
Technical field
The utility model belongs to technical field of electromagnetic measurement, is specifically related to a kind of lightning-proof protection circuit for intelligent electric energy meter.
Background technology
In order to realize intelligent power, electric energy meter being provided with RS485 communication interface, remote meter reading and control can be realized.In No. 201110208655th, Chinese patent application, such as disclose a kind of single-phase remote cost control intelligent electric energy meter that there is RS485 control signal and export, it comprises metering circuit, treatment circuit and interface circuit, the signal of metering circuit exports or input inputs or outputs to hold with a signal for the treatment of circuit and is connected, and No. two signals for the treatment of circuit input or output to hold and to export with the signal of interface circuit or input is connected; Metering circuit comprises voltage sampling circuit, a current sampling circuit, No. two current sampling circuits, metering units and pulse output unit, described voltage sampling circuit is for gathering the voltage of live wire, a current sampling circuit is for gathering the electric current by live wire, and No. two current sampling circuits are for gathering the electric current by zero line; The voltage sampling signal output of voltage sampling circuit and the voltage sampling signal input of metering units connect, a current sampling circuit current sampling signal output is connected with a current sampling signal input of metering units, and the current sampling signal output of No. two current sampling circuits is connected with No. two current sampling signal inputs of metering units; Interface circuit comprises RS485 communication unit, jumping/switching-in control unit and built-in relay, and RS485 communication unit communicates for the RS485 realized between treatment circuit with user; Built-in relay is connected on live wire, and the control signal output of jumping/switching-in control unit is connected with the control signal input of built-in relay.
But in actual use, often have static discharge, transient pulse interference.The situations such as thunderbolt interference occur, and not only can cause the damage of RS485 interface device, electric energy meter also can be disturbed normally to work.So a lot of producer all devises lightning prevention circuit in RS485 communication port, but existing design is poor to adverse circumstances adaptive capacity, anti-interference anti-lightning strike DeGrain, one to thunderstorm season, just often there is the phenomenon crashing, can not check meter, bring harmful effect to user, producer too increases a large amount of maintenance costs simultaneously.
Utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of lightning prevention circuit for intelligent electric energy meter.It adopts the compound lightning protection structure of two-stage, in use really plays lightning protection effect, avoid deadlock that the factors such as thunderbolt cause, can not the problem such as remote meter reading.
According to the technical solution of the utility model, a kind of lightning prevention circuit for intelligent electric energy meter is provided, its its by input port adopt gas discharge tube as first order lightning protection, output port adopt thermistor add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas discharge tubes; Second level lightning protection is made up of thermistor PTC and TVS pipe.
Wherein, gas discharge tube adopts ceramic enclosed package, and the inner metal electrode by two or several band gap, fills and formed with inert gas (argon gas or neon).Gas discharge tube Q1 and gas discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas discharge tube Q2 holds ground connection.
Preferably, thermistor PTC1 mono-termination 485 bus A hold and gas discharge tube Q1 and Q2, thermistor PTC1 another termination electric energy meter 485A hold and transient voltage suppressor TVS1 and TVS2.
Preferably, another termination electric energy meter 485B of thermistor PTC2 mono-termination 485 bus B end and gas discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and electric energy meter 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and electric energy meter 485B holds.
Further, transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and electric energy meter 485A hold, another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and electric energy meter 485B end, transient voltage suppressor TVS3 and ground end.
Beneficial effect: the utility model is used for the lightning-proof protection circuit of intelligent electric energy meter; adopt the compound lightning protection structure of two-stage; namely adopt gas discharge tube as first order lightning protection by input port; output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; after secondary pressure limiting; voltage is clamped at about 6.8V, thus protects 485 modular circuits, avoid deadlock that the factors such as thunderbolt cause, can not the problem such as remote meter reading.
Accompanying drawing explanation
Fig. 1 is used for the circuit diagram of the lightning-proof protection circuit of intelligent electric energy meter.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.Additionally, protection range of the present utility model only should be limited to following concrete structure or parts or design parameter.
Design of the present utility model is: adopt the compound lightning protection structure of two-stage, namely adopts gas discharge tube as first order lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection.First order lightning protection is made up of two gas discharge tubes, and carry out common mode protection respectively and protect with differential mode, through-current capability reaches 10kV/500A, voltage can be impaired to about 500V.Second level lightning protection is made up of thermistor PTC and TVS pipe, and thermistor plays metering function, and after the pressure limiting of TVS pipe secondary, voltage is clamped at about 6.8V, thus protects 485 modular circuits.
Through test of many times, employ gas discharge tube and adopt ceramic enclosed package in the utility model, the inner metal electrode by two or several band gap, fills and is formed with inert gas (argon gas or neon).The operation principle of gas discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas, make the gas breakdown in gas discharge tube, the gap of gas discharge tube two interpolar is converted into conduction state by original state of insulation, low-resistance is become by high resistant, voltage after conducting between discharge tube the two poles of the earth maintains the residual voltage level of putting electric arc channel and determining, makes the voltage at electrode two ends be no more than puncture voltage.Gas discharge tube is usually used in the first order in multi-level protection circuit or front two-stage, works release Lightning Transient overcurrent and over-voltage effect.Advantage: insulation resistance is very large, and parasitic capacitance is very little, and carrying out surge protection ability is strong, has symmetry of discharging preferably, is usually used in the protection of communication line.
TVS pipe and transient voltage suppressor are a kind of new products grown up on voltage-stabiliser tube Process ba-sis, and when the high energy impact events of moment is stood at TVS pipe two ends, it can with 10
-12the speed of second-time; its impedance is reduced suddenly; the surge power of simultaneously stability up to thousands of watts; voltage clamp between its two ends is numerically predetermined at one; thus effectively protect circuit element below to damage from the impact of various transient state high energy surge pulse; its static discharge effect can discharge the pulse more than 10000V, more than 60A, and can continue 10ms.TVS pipe has that the response time is fast, transient power is large, electric capacity is low, leakage current is low, puncture voltage deviation is little, clamping voltage compared with easy to control, little without damage limit, volume, be easy to the advantages such as installation, be widely used in the every field such as computer system, communication apparatus, consumer electronics, power supply, household electrical appliance at present.
With reference to accompanying drawing 1, show in particular the circuit diagram of the lightning-proof protection circuit for intelligent electric energy meter, gas discharge tube Q1 and gas discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas discharge tube Q2 holds ground connection; Thermistor PTC1 mono-termination 485 bus A hold and gas discharge tube Q1 and Q2, thermistor PTC1 another termination electric energy meter 485A hold and transient voltage suppressor TVS1 and TVS2; Another termination electric energy meter 485B of thermistor PTC2 mono-termination 485 bus B end and gas discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and electric energy meter 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and electric energy meter 485B holds; Another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and electric energy meter 485A end, transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and electric energy meter 485B end, transient voltage suppressor TVS3 and ground end.
When occurring when being struck by lightning, induction overvoltage is introduced by 485 bus A, B port, and gas discharge tube Q2 carries out common mode protection, and gas discharge tube Q1 carries out differential mode protection, and now overvoltage is weakened severely about 500V.When input voltage is excessive, the electric current in thermistor PTC and TVS pipe series loop will become greatly, and when this electric current exceedes the operating current of thermistor, the resistance of thermistor becomes rapidly large, whole loop current is diminished rapidly, plays metering function.When voltage is excessive, the impedance of TVS pipe reduces suddenly, and simultaneously stability big current, makes the voltage at its two ends reduce rapidly, and the voltage being input to electric energy meter 485 module so is just clamped at about 6.8V, achieves lightning protection effect.
Repeatedly test in the highest testing standard 10/700us of communication line, 4kV environment, lightning protection effect is good, electric energy meter working stability, does not occur crashing, communicate the problem such as unsuccessful.
The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present utility model of claims definition, can make various amendment in form and details.
Claims (6)
1. for a novel lightning protecting circuit for intelligent electric energy meter, it is characterized in that, it adopts gas discharge tube as first order lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas discharge tubes; Second level lightning protection is made up of thermistor PTC and TVS pipe.
2. according to the novel lightning protecting circuit for intelligent electric energy meter according to claim 1, it is characterized in that, gas discharge tube adopts ceramic enclosed package, and the inner metal electrode by two or several band gap, inside is filled with inert gas.
3. according to the novel lightning protecting circuit for intelligent electric energy meter described in claim 1 or 2, it is characterized in that, gas discharge tube Q1 and gas discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas discharge tube Q2 holds ground connection.
4. according to the novel lightning protecting circuit for intelligent electric energy meter described in claim 1 or 2, it is characterized in that, thermistor PTC1 mono-termination 485 bus A hold and gas discharge tube Q1 and Q2, thermistor PTC1 another termination electric energy meter 485A hold and transient voltage suppressor TVS1 and TVS2.
5. according to the novel lightning protecting circuit for intelligent electric energy meter described in claim 1 or 2, it is characterized in that, another termination electric energy meter 485B of thermistor PTC2 mono-termination 485 bus B end and gas discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and electric energy meter 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and electric energy meter 485B holds.
6. according to the novel lightning protecting circuit for intelligent electric energy meter described in claim 1 or 2, it is characterized in that, another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and electric energy meter 485A end, transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and electric energy meter 485B end, transient voltage suppressor TVS3 and ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850197.3U CN204316084U (en) | 2014-12-29 | 2014-12-29 | A kind of novel lightning protecting circuit for intelligent electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850197.3U CN204316084U (en) | 2014-12-29 | 2014-12-29 | A kind of novel lightning protecting circuit for intelligent electric energy meter |
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| CN204316084U true CN204316084U (en) | 2015-05-06 |
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| CN201420850197.3U Expired - Fee Related CN204316084U (en) | 2014-12-29 | 2014-12-29 | A kind of novel lightning protecting circuit for intelligent electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404131A (en) * | 2020-04-09 | 2020-07-10 | 贵州航天天马机电科技有限公司 | Protection circuit for preventing lightning strike |
-
2014
- 2014-12-29 CN CN201420850197.3U patent/CN204316084U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404131A (en) * | 2020-04-09 | 2020-07-10 | 贵州航天天马机电科技有限公司 | Protection circuit for preventing lightning strike |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150506 Termination date: 20171229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |