CN105424994A - Smart electric energy meter with lightening-proof protection circuit - Google Patents
Smart electric energy meter with lightening-proof protection circuit Download PDFInfo
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- CN105424994A CN105424994A CN201510266513.1A CN201510266513A CN105424994A CN 105424994 A CN105424994 A CN 105424994A CN 201510266513 A CN201510266513 A CN 201510266513A CN 105424994 A CN105424994 A CN 105424994A
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Abstract
The invention provides a smart electric energy meter with a lightening-proof protection circuit. The smart electric energy meter adopts two-stage composite lightening-proof structure, that is to say, an input port adopts gas discharge tubes as first-stage lightening-proof protection, and an output port adopts a thermistor and a transient voltage suppression diode which are taken as second-stage lightening-proof protection; the first-stage lightening-proof protection is composed of the two gas discharge tubes respectively performing common mode protection and differential mode protection, the through-current capability reaches 10KV/500A, and a voltage can be weakened to be about 500V; and the second-stage lightening-proof protection is composed of the thermistor PTC and a TVS tube, the thermistor plays a role in current limiting, and the voltage is clamped about 6.8V after secondary voltage limiting via the TVS tube, so a 485 module circuit is protected. The smart electric energy meter adopts the two-stage composite lightening-proof structure, a role in lightning protection is really played in the usage process, and the problems, such as a dead halt caused by a lightning stroke and other factors and a meter cannot be read remotely are prevented.
Description
Technical field
The invention belongs to technical field of electromagnetic measurement, be specifically related to a kind of intelligent electric energy meter with lightning-proof protection circuit.
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 end 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 end 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 terminal of voltage sampling circuit and the voltage sampling signal input end of metering units connect, a current sampling circuit current sampling signal output terminal is connected with a current sampling signal input end of metering units, and the current sampling signal output terminal of No. two current sampling circuits is connected with No. two current sampling signal input ends 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 terminal of jumping/switching-in control unit is connected with the control signal input end 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-proof protection circuit in RS485 communication port; but existing design is poor to rugged surroundings adaptive faculty; 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.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of intelligent electric energy meter with lightning-proof protection circuit.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 technical scheme of the present invention, a kind of intelligent electric energy meter with lightning-proof protection circuit is provided, 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.
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 present invention 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 the circuit diagram of the lightning-proof protection circuit for intelligent electric energy meter.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
Design proposal of the present invention 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 in the present invention and adopt ceramic enclosed package, the inner metal electrode by two or several band gap, fills and is formed with inert gas (argon gas or neon).The principle of work of gas-discharge tube is gas discharge, when impressed 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 voltage breakdown.Gas-discharge tube is usually used in the first order in multi-level protection circuit or front two-stage, works release Lightning Transient excess current and over-voltage effect.Advantage: insulation resistance is very large, and stray 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; it is a kind of new product grown up on stabilivolt Process ba-sis; when the high energy impact events of moment is stood at TVS pipe two ends; it can with the speed of 10-12 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 component 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, voltage breakdown 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, induced 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 superpotential 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 action 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 present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (6)
1. the intelligent electric energy meter with lightning-proof protection circuit, it is characterized in that, lightning-proof protection circuit is provided with in this intelligent electric energy meter, described lightning-proof protection circuit 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.
2. according to the intelligent electric energy meter with lightning-proof protection circuit 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, fills and formed with inert gas (argon gas or neon).
3. according to the intelligent electric energy meter with lightning-proof protection circuit 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 intelligent electric energy meter with lightning-proof protection circuit 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 intelligent electric energy meter with lightning-proof protection circuit 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 intelligent electric energy meter with lightning-proof protection circuit 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 |
|---|---|---|---|
| CN201510266513.1A CN105424994A (en) | 2015-05-23 | 2015-05-23 | Smart electric energy meter with lightening-proof protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510266513.1A CN105424994A (en) | 2015-05-23 | 2015-05-23 | Smart electric energy meter with lightening-proof protection circuit |
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| CN105424994A true CN105424994A (en) | 2016-03-23 |
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| CN201510266513.1A Pending CN105424994A (en) | 2015-05-23 | 2015-05-23 | Smart electric energy meter with lightening-proof protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849048A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
| CN108110744A (en) * | 2017-12-25 | 2018-06-01 | 国网山东省电力公司滨州供电公司 | A kind of parallel connection Wiring type electric energy meter connection lightning protection device |
| CN108761157A (en) * | 2018-04-24 | 2018-11-06 | 河南机电职业学院 | A kind of electronic message terminal |
| WO2020259547A1 (en) * | 2019-06-27 | 2020-12-30 | 宁波三星医疗电气股份有限公司 | Anti-impact structure, anti-impact assembly and electric energy meter |
| CN113552414A (en) * | 2021-08-20 | 2021-10-26 | 万安裕高电子科技有限公司 | Breakdown-preventing intelligent electric meter |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
-
2015
- 2015-05-23 CN CN201510266513.1A patent/CN105424994A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849048A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
| CN108110744A (en) * | 2017-12-25 | 2018-06-01 | 国网山东省电力公司滨州供电公司 | A kind of parallel connection Wiring type electric energy meter connection lightning protection device |
| CN108761157A (en) * | 2018-04-24 | 2018-11-06 | 河南机电职业学院 | A kind of electronic message terminal |
| CN108761157B (en) * | 2018-04-24 | 2023-03-21 | 河南机电职业学院 | Electronic information terminal |
| WO2020259547A1 (en) * | 2019-06-27 | 2020-12-30 | 宁波三星医疗电气股份有限公司 | Anti-impact structure, anti-impact assembly and electric energy meter |
| CN113552414A (en) * | 2021-08-20 | 2021-10-26 | 万安裕高电子科技有限公司 | Breakdown-preventing intelligent electric meter |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
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Application publication date: 20160323 |