CN205353342U - Single -phase carrier wave smart electric meter communication module interface load bearing capability tester - Google Patents
Single -phase carrier wave smart electric meter communication module interface load bearing capability tester Download PDFInfo
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- CN205353342U CN205353342U CN201520203565.XU CN201520203565U CN205353342U CN 205353342 U CN205353342 U CN 205353342U CN 201520203565 U CN201520203565 U CN 201520203565U CN 205353342 U CN205353342 U CN 205353342U
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Abstract
The utility model provides a single -phase carrier wave smart electric meter communication module interface load bearing capability tester, the tester includes voltage control circuit, DA converter, DSP, MOSFET circuit, current detection unit, voltage detection unit, single phase power, AD converter, PC, resistance R1 and resistance R2. The utility model discloses on the basis of the drain current that detects the MOSFET circuit and hourglass - source electrode voltage, through bars - the source electrode voltage of DSP and voltage control circuit control MOSFET circuit to it all satisfies the load of measuring the requirement to obtain resistance and precision. Obtain the magnitude of voltage of ammeter module interface between for communication module power supply vcc end and ground through DSP at last, realize the single -phase carrier wave smart electric meter of automated inspection communication module interface load bearing capability. The utility model is suitable for a test of single -phase carrier wave smart electric meter communication module interface load bearing capability.
Description
Technical field
This utility model relates to a kind of single-phase carrier intelligent electric meter communication module interface load capacity tester, belongs to intelligent electric meter technical field of measurement and test.
Background technology
Carrier intelligent ammeter, built with communication module interface, installs communication module on communication module interface, thus can pass through electric lines of force and realize the communication between concentrator with carrier system.But find in running at the scene, owing to the load capacity of ammeter communication module interface does not mate with carrier module power consumption, the Communications failure problem between ammeter and concentrator can be caused.When ammeter communication module interface load capacity deficiency, the normal operation of communication module can cannot be driven；When ammeter communication module interface load capacity is beyond allowed band, the power consumption of ammeter own can be caused excessive.For this, single-phase carrier intelligent electric meter communication interface load capacity is proposed corresponding requirement by State Grid Corporation of China, regulation: V in state's net company standard " Q/GDW1364-2013 single-phase smart meter technical specification "CCVoltage is within the scope of+12V ± 1V, and load current should within the scope of 0mA～125mA.
The detection of current single-phase carrier intelligent electric meter communication module interface load capacity mainly adopts following methods, namely the communication module installed in electric energy meter is first taken off, again in the ammeter communication module interface purely resistive load that indirect resistance is 96 Ω (± 5% precision) to the power supply of module for power supply He ground, finally detect the magnitude of voltage of this place two end with circuit tester, observe voltage whether within the scope of 12V ± 1V.This kind of mode needs manual operation, time-consuming and error-prone.When test specimen quantity is more, more seem loaded down with trivial details.And under this kind of method, the resistance of the resistance between power supply and ground is subject to the factor impacts such as temperature and changes, and in turn results in the inaccurate of testing result.
Summary of the invention
The purpose of this utility model, in order to overcome the deficiencies in the prior art, it is provided that a kind of single-phase carrier intelligent electric meter communication module interface load capacity tester, for automatically detecting the load capacity of single-phase carrier intelligent electric meter communication module interface.
In order to solve above-mentioned technical problem, this utility model is achieved through the following technical solutions: a kind of single-phase carrier intelligent electric meter communication module interface load capacity tester, including: voltage control circuit, D/A converter, DSP, MOSFET circuit, current detecting unit, voltage detection unit, single phase poaer supply, A/D converter, PC, resistance R1 and resistance R2.
Described single phase poaer supply connects tested ammeter, provides power supply to tested ammeter；Resistance R1 and resistance R2 series connection, is attempted by the power supply V that ammeter module interface is powered to communication moduleCCAnd between ground；The input of voltage detection unit is connected on the two ends of resistance R2；The outfan of voltage detection unit, through A/D converter, converts the analogue signal of detection voltage to digital signal, and is transferred to DSP；The drain electrode of MOSFET circuit meets the V of ammeter inner module interfaceCCEnd, its source electrode connects the ground of ammeter module interface by current detecting unit；The drain current of current detecting unit detection MOSFET circuit, its outfan, through A/D converter, converts the grid current analogue signal of the MOSFET circuit detected to digital signal, and is transferred to DSP；The drain electrode of MOSFET circuit connects D/A converter by voltage conversion circuit, D/A converter be transferred to DSP；DSP and PC interconnection.
The MOSFET circuit drain-source voltage value that described DSP records is within the scope of+12V ± 1V, then this ammeter communication module interface load capacity meets requirement.
The MOSFET circuit drain-source voltage value that described DSP records is not within the scope of+12V ± 1V, then this ammeter communication module interface load capacity is unsatisfactory for requirement.
Operation principle of the present utility model is, this utility model a kind of single-phase carrier intelligent electric meter communication module interface load capacity tester is on the drain current of detection MOSFET circuit and the basis of drain-source voltage, voltage, current signal that transmission is come in by DSP are analyzed processing, according to the drain current of MOSFET circuit obtained, drain-source voltage, calculate resistance value, by comparing with initial set value, export a negative feedback voltage, meet the resistance value of measurement requirement obtaining precision.The negative feedback voltage signal of DSP output connects again through the input of D/A converter and voltage control circuit；The outfan of voltage control circuit is connected with the grid of MOSFET circuit；DSP realizes communication by communication interface and PC, is transferred in PC by the result recorded and preserves.
Compared with prior art, the beneficial effects of the utility model are, this utility model is on the drain current of detection MOSFET circuit and the basis of drain-source voltage, the gate-source voltage of MOSFET circuit is controlled, to obtain resistance and precision is satisfied by the load of measurement requirement by DSP and voltage control circuit.Ammeter module interface is obtained to the magnitude of voltage between communication module power supply Vcc end and ground, it is achieved detection single-phase carrier intelligent electric meter communication module interface load capacity automatically finally by DSP.
This utility model is applicable to the test of single-phase carrier intelligent electric meter communication module interface load capacity.
Accompanying drawing explanation
Fig. 1 is main circuit structure schematic diagram of the present utility model；
Fig. 2 show the flow chart of the detection single-phase carrier intelligent electric meter communication interface load capacity of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and compare accompanying drawing this utility model is described in detail.
Fig. 1 is main circuit structure schematic diagram of the present utility model.
The present embodiment one single-phase carrier intelligent electric meter communication module interface load capacity tester includes: voltage control circuit, D/A converter, DSP, MOSFET circuit, current detecting unit, voltage detection unit, single phase poaer supply, A/D converter, PC, resistance R1 and resistance R2.
In instrument, single phase poaer supply provides power supply for tested ammeter, is connected with the voltage terminal of tested ammeter during detection.Resistance R1 and resistance R2 series connection is followed by module interface to the power supply V of module for power supplyCCBetween end and ground, the voltage at voltage detection unit detection resistance R2 two ends, MOSFET circuit drain-source voltage is obtained to DSP, DSP by the resistance of this magnitude of voltage, resistance R1 and resistance R2 converting the voltage waveform of detection to digital data transmission by A/D converter.The source electrode of MOSFET circuit is connected with the ground of ammeter module interface by current detecting unit, and the drain current of current detecting circuit unit MOSFET circuit also converts digital data transmission to in DSP by A/D converter.The DSP resistance according to the drain-source voltage obtained, drain current, resistance R1 and resistance R2, obtains V nowCCAnd the equivalent resistance of circuit between ground end, this resistance value setting resistance value initial with in DSP compares, form the negative feedback voltage of a digital signal form, by D/A converter and voltage control circuit, the gate-source voltage of MOSFET is controlled, until the calculated resistance value of DSP equal with initial setting value 96 Ω (precision meets ± 5%), the MOSFET circuit drain-source voltage recorded under such condition is the V of ammeter inner module interfaceCCVoltage between end and ground.
Require according to relevant criterion: VCCVoltage is within the scope of+12V ± 1V, and load current should within the scope of 0mA～125mA.Therefore, when the DSP MOSFET circuit drain-source voltage value recorded is within the scope of+12V ± 1V, then this ammeter communication module interface load capacity meets requirement；When the DSP MOSFET circuit drain-source voltage value recorded is not within the scope of+12V ± 1V, then this ammeter communication module interface load capacity is unsatisfactory for requirement.DSP is connected with PC by communication interface, is transferred on PC by data measured and preserves, it is simple to the record of detection data.Initial setting value can be transferred to DSP by PC.
Fig. 2 show the flow chart of detection single-phase carrier intelligent electric meter communication interface load capacity of the present utility model.
The step of detection single-phase carrier intelligent electric meter communication interface load capacity is as follows:
Step 1: single phase poaer supply is opened, starts test；
Step 2: resistance initial value 96 Ω is set by PC；
Step 3: current detecting unit detects the drain current of MOSFET circuit；
Step 4: voltage detection unit detects the magnitude of voltage at R2 two ends；
Step 5:DSP obtains drain current and the drain-source voltage of MOSFET circuit；
Step 6: calculate the resistance R of the equivalent resistance obtained between Vcc and ground；
Step 7:DSP exports negative feedback voltage, controls the gate-source voltage of MOSFET circuit；
Step 8: repeating step 3 to step 7, until the resistance of the equivalent resistance between the calculated Vcc of DSP and ground meets measurement requirement, resistance is 96 Ω, and precision meets ± 5%；
Step 9:DSP record MOSFET circuit drain-source voltage now, and it is transferred to PC；
Step 10: test terminates.
By this utility model one single-phase carrier intelligent electric meter communication module interface load capacity tester, it is possible to achieve the automatic detection of single-phase carrier intelligent electric meter communication module interface load capacity.
The undeclared part related in this utility model is same as the prior art or adopts prior art to be realized.
Claims (1)
1. a single-phase carrier intelligent electric meter communication module interface load capacity tester, it is characterized in that, described tester includes voltage control circuit, D/A converter, DSP, MOSFET circuit, current detecting unit, voltage detection unit, single phase poaer supply, A/D converter, PC, resistance R1 and resistance R2；
Described single phase poaer supply connects tested ammeter, provides power supply to tested ammeter；Described resistance R1 and resistance R2 series connection, is attempted by the power supply V that ammeter module interface is powered to communication moduleCCAnd between ground；The input of described voltage detection unit is connected on the two ends of resistance R2；The outfan of described voltage detection unit, through A/D converter, converts the analogue signal of detection voltage to digital signal, and is transferred to DSP；The drain electrode of described MOSFET circuit meets the V of ammeter inner module interfaceCCEnd, its source electrode connects the ground of ammeter module interface by current detecting unit；The drain current of described current detecting unit detection MOSFET circuit, its outfan, through A/D converter, converts the grid current analogue signal of the MOSFET circuit detected to digital signal, and is transferred to DSP；The drain electrode of described MOSFET circuit connects D/A converter by voltage conversion circuit, D/A converter be transferred to DSP；Described DSP and PC interconnection..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520203565.XU CN205353342U (en) | 2015-04-07 | 2015-04-07 | Single -phase carrier wave smart electric meter communication module interface load bearing capability tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520203565.XU CN205353342U (en) | 2015-04-07 | 2015-04-07 | Single -phase carrier wave smart electric meter communication module interface load bearing capability tester |
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| Publication Number | Publication Date |
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| CN205353342U true CN205353342U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520203565.XU Expired - Fee Related CN205353342U (en) | 2015-04-07 | 2015-04-07 | Single -phase carrier wave smart electric meter communication module interface load bearing capability tester |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357303A (en) * | 2016-09-22 | 2017-01-25 | 国网甘肃省电力公司电力科学研究院 | Power line carrier communication detection system |
| CN107450043A (en) * | 2017-07-21 | 2017-12-08 | 国网江西省电力公司电力科学研究院 | Communication module of intelligent electric energy meter interface load capacity test device and method |
| CN107800464A (en) * | 2017-10-19 | 2018-03-13 | 国网天津市电力公司电力科学研究院 | A kind of noise jamming automated detection system for concentrator bandwidth carrier module |
| CN107872247A (en) * | 2017-10-19 | 2018-04-03 | 国网天津市电力公司电力科学研究院 | A kind of noise jamming automated detection method and system for three-phase electric energy meter narrowband carrier module |
| CN111337871A (en) * | 2020-02-29 | 2020-06-26 | 贵州电网有限责任公司 | Electric energy meter and terminal communication module IO port level adjustable circuit |
-
2015
- 2015-04-07 CN CN201520203565.XU patent/CN205353342U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357303A (en) * | 2016-09-22 | 2017-01-25 | 国网甘肃省电力公司电力科学研究院 | Power line carrier communication detection system |
| CN107450043A (en) * | 2017-07-21 | 2017-12-08 | 国网江西省电力公司电力科学研究院 | Communication module of intelligent electric energy meter interface load capacity test device and method |
| CN107800464A (en) * | 2017-10-19 | 2018-03-13 | 国网天津市电力公司电力科学研究院 | A kind of noise jamming automated detection system for concentrator bandwidth carrier module |
| CN107872247A (en) * | 2017-10-19 | 2018-04-03 | 国网天津市电力公司电力科学研究院 | A kind of noise jamming automated detection method and system for three-phase electric energy meter narrowband carrier module |
| CN111337871A (en) * | 2020-02-29 | 2020-06-26 | 贵州电网有限责任公司 | Electric energy meter and terminal communication module IO port level adjustable circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 |