CN204679622U - With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module - Google Patents
With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module Download PDFInfo
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- CN204679622U CN204679622U CN201520236915.2U CN201520236915U CN204679622U CN 204679622 U CN204679622 U CN 204679622U CN 201520236915 U CN201520236915 U CN 201520236915U CN 204679622 U CN204679622 U CN 204679622U
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Abstract
With a three-phase intelligent electric-energy meter communication interface load capacity proving installation for communication module, comprise MOSFET circuit, resistance R1 and resistance R2, three-phase supply, voltage detection module, current detection module, high speed sampling circuit, A/D converting unit, MCU circuit, serial communication, keyboard, DC voltage measurement display circuit, D/A converting unit and pwm control circuit.The utility model adopts device to adopt the electronic load formed for main circuit using MOSFET circuit as test load, and electronic load can simulate the loading condition determined electric current, determine voltage, determine resistance, can initialization; On the basis of the drain current and drain-source voltage that detect MOSFET circuit, regulate MOSFET circuit by MCU circuit and pwm control circuit, to obtain resistance and all satisfied load of measuring requirement of precision; The accuracy of high speed sampling circuit to tested DC voltage is utilized effectively to measure.The utility model is applicable to the three-phase intelligent electric-energy meter communication interface load capacity test of being with communication module.
Description
Technical field
The utility model relates to a kind of three-phase intelligent electric-energy meter communication interface load capacity proving installation with communication module, belongs to electric detecting technology field.
Background technology
Communication module is power user power consumption information acquisition system main website and acquisition terminal, collector and terminal, and the unit of local communication mutual data transmission between acquisition terminal and intelligent electric energy meter.Intelligent electric energy meter is configured with communication module interface, can carry out data interaction with communication module, and employing power line carrier communication or micro power radio communication mode realize the communication between collector/acquisition terminal.
Find in on-the-spot operation, intelligent electric energy meter and communication module occur more and more mating compatibility issue, as ammeter communication interface load capacity exceeds allowed band, make module communication dynamic power consumption comparatively large, are drawn by electric energy meter electric source and collapse, cause electric energy meter not work; Electric energy meter communication interface load capacity is not enough, communication module cannot be driven normally to work, affect the problem of power information acquisition system data reading system.For this reason, state's net company standard " Q/GDW 1827-2013 three-phase intelligent table technical manual " proposes corresponding requirement to three-phase intelligent electric-energy meter communication interface load capacity, regulation: V
cCvoltage+12V ± 1V, load current 0mA ~ 400mA.
Traditional communication interface load capacity method of testing is the communication module of taking off three-phase intelligent ammeter, according to ammeter communication interface pin definitions, purely resistive load is accessed between pin and ground at electric energy meter communication module analog power interface (Vcc), load resistance is 30 Ω (± 5% precision), measures Vcc voltage and ground stitch magnitude of voltage whether within the scope of 12V ± 1V with multimeter.This method of testing needs manually to search power interface wiring, loaded down with trivial details time-consuming, easily make mistakes, and adopt purely resistive load by such environmental effects, cause load capacity test accuracy low, poor reliability.
Summary of the invention
The purpose of this utility model is, in order to the method solving existing manual testing's communication interface load capacity is loaded down with trivial details, easily make mistakes, problem that accuracy is low, meet on-the-spot test needs; Overcome the deficiencies in the prior art, provide a kind of three-phase intelligent electric-energy meter communication interface load capacity proving installation with communication module.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: the three-phase intelligent electric-energy meter communication interface load capacity proving installation of the utility model band communication module comprises: MOSFET circuit, resistance R1 and resistance R2, three-phase supply, voltage detection module, current detection module, high speed sampling circuit, A/D converting unit, MCU circuit, serial communication, keyboard, DC voltage measurement display circuit, D/A converting unit and pwm control circuit.
Three-phase intelligent electric-energy meter communication interface load capacity proving installation adopts the electronic load formed for main circuit using MOSFET circuit as test load.
In the utility model device, the drain electrode of MOSFET circuit connects tested electric energy meter communication module analog power interface Vcc pin, and its source electrode connects the ground of ammeter communication interface by current detection module; Tested three-phase intelligent electric-energy meter provides power supply by three-phase supply; Resistance R1 and resistance R2 connects, and is attempted by between electric energy meter communication module analog power interface Vcc pin and ground; The input end of voltage detection module is connected on the two ends of resistance R2, and the output terminal of voltage detection module, through high speed sampling circuit, after the conversion carrying out test data and computing, is transferred to MCU circuit; Current detection module is responsible for the drain current detecting MOSFET circuit, and its output terminal, through A/D converting unit, converts the drain current simulating signal of the MOSFET circuit detected to digital signal, and is transferred to MCU circuit; Another output terminal of MCU circuit connects pwm control circuit by D/A converting unit, and pwm control circuit connects the grid of MOSFET circuit; The output terminal of MCU circuit connects DC voltage measurement display circuit; Keyboard exports and connects MCU circuit; Serial port circuit and MCU circuit interconnection.
MCU circuit is responsible for drain current signal to the MOSFET circuit collected, drain-source voltage signal is analyzed, the voltage control signal exporting a certain size is compared with preset value, output to D/A converting unit, D/A converting unit output terminal is connected with the input end of pwm control circuit, and the output terminal of pwm control circuit connects the grid of MOSFET circuit; Realize man-machine interaction by keyboard and DC voltage measurement display circuit, serial communication realizes the both-way communication with MCU circuit, for selecting different mode of operations and setting correlation parameter.
Compared with prior art, the beneficial effects of the utility model are: the utility model adopts the electronic load formed for main circuit using MOSFET circuit as test load, electronic load can simulate the loading condition determined electric current, determine voltage, determine resistance, can initialization; On the basis of the drain current and drain-source voltage that detect MOSFET circuit, regulate MOSFET circuit by MCU circuit and pwm control circuit, to obtain resistance and all satisfied load of measuring requirement of precision; The accuracy of high speed sampling circuit to tested DC voltage is utilized effectively to measure.
The utility model is applicable to the three-phase intelligent electric-energy meter communication interface load capacity test of being with communication module.
Accompanying drawing explanation
Fig. 1 is the utility model main circuit structure schematic diagram;
Fig. 2 is the test flow chart of three-phase intelligent electric-energy meter communication interface load capacity of the present utility model.
Embodiment
Contrast accompanying drawing below in conjunction with embodiment the present invention is described in detail.
Fig. 1 is main circuit structure schematic diagram of the present invention.
The present embodiment device comprises: MOSFET circuit, resistance R1 and resistance R2, three-phase supply, voltage detection module, current detection module, high speed sampling circuit, A/D converting unit, MCU circuit, serial communication, keyboard, DC voltage measurement display circuit, D/A converting unit and pwm control circuit.
The present embodiment MCU circuit adopts TMS320LF2812 chip.
In device, tested three-phase intelligent electric-energy meter is powered by three-phase supply; Resistance R1 and resistance R2 is attempted by tested ammeter communication simulation power interface (Vcc) between pin and ground after connecting; Device adopts the electronic load formed for main circuit using MOSFET circuit as test load; Current detection module detects the drain current of MOSFET circuit, converts corresponding current digital signal to be transferred to TMS320LF2812 by A/D converting unit; Voltage detection module detects the voltage at resistance R2 two ends, and utilize high speed sampling circuit to carry out high-speed sampling to tested voltage, utilize built-in data processor to carry out test data conversion and computing, tested DC ripple voltage is effectively measured, then is transferred to TMS320LF2812.TMS320LF2812, according to the voltage obtained, current signal, in conjunction with the resistance of resistance R1 and resistance R2, obtains V now
cCand the equivalent resistance of circuit between ground end, with preset value comparative analysis, as the foundation of TMS320LF2812 regulable control voltage swing, control the turn-on and turn-off of power circuit metal-oxide-semiconductor, obtain the operating voltage needed for reality, electric current, make the equivalent resistance of ammeter communication simulation power interface (Vcc) between pin and ground be 30 Ω (precision meets ± 5%).In such cases, to the V of ammeter inner module interface
cCbetween end and ground, output voltage, output current, output ripple etc. are measured, and realize three-phase intelligent electric-energy meter communication interface load capacity and automatically test.
According to state's net company standard " the Q/GDW 1827-2013 three-phase intelligent table technical manual " requirement to three-phase intelligent electric-energy meter communication interface load capacity: VCC voltage+12V ± 1V, load current 0mA ~ 400mA.Realize man-machine interaction by keyboard and DC voltage measurement display circuit, be convenient to the record detecting data; Serial communication realizes the both-way communication with TMS320LF2812 MCU circuit, for selecting different mode of operations and the relevant initial parameter of setting.
Figure 2 shows that the test flow chart of the utility model three-phase intelligent electric-energy meter communication interface load capacity.
The step detecting single-phase carrier intelligent electric meter communication interface load capacity is as follows:
Step 1: three-phase supply is opened, starts test;
Step 2: resistance initial value 30 Ω is set by keyboard and serial communication;
Step 3: current detection module detects the drain current of MOSFET circuit;
Step 4: voltage detection module 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: the resistance calculating the equivalent resistance between Vcc and ground;
Step 7:DSP exports negative feedback voltage signal, the grid-source voltage of control MOSFET circuit;
Step 8: repeat step 3 to step 7, until the resistance of equivalent resistance between the Vcc that calculates of DSP and ground meets measure requirement, resistance is 30 Ω, and precision meets ± 5%;
Step 9:DSP record MOSFET circuit drain-source voltage now, and be transferred to DC voltage measurement display circuit;
Step 10: test terminates.
By a kind of three-phase intelligent electric-energy meter communication interface load capacity proving installation with communication module of the utility model, realize three-phase intelligent electric-energy meter communication interface load capacity and automatically test.
The undeclared part related in the utility model is same as the prior art or adopt prior art to be realized.
Claims (3)
1. the three-phase intelligent electric-energy meter communication interface load capacity proving installation with communication module, comprises A/D converting unit, D/A converting unit, three-phase supply, keyboard, resistance R1 and resistance R2, it is characterized in that,
Described device also comprises MOSFET circuit, voltage detection module, current detection module, high speed sampling circuit, MCU circuit, serial communication, DC voltage measurement display circuit and pwm control circuit;
The drain electrode of described MOSFET circuit connects tested electric energy meter communication module analog power interface Vcc pin, and its source electrode connects the ground of ammeter communication interface by current detection module; Tested three-phase intelligent electric-energy meter provides power supply by three-phase supply; Resistance R1 and resistance R2 connects, and is attempted by between electric energy meter communication module analog power interface Vcc pin and ground; The input end of voltage detection module is connected on the two ends of resistance R2, and the output terminal of voltage detection module, through high speed sampling circuit, after the conversion carrying out test data and computing, is transferred to MCU circuit; Current detection module is responsible for the drain current detecting MOSFET circuit, and its output terminal, through A/D converting unit, converts the drain current simulating signal of the MOSFET circuit detected to digital signal, and is transferred to MCU circuit; Another output terminal of MCU circuit connects pwm control circuit by D/A converting unit, and pwm control circuit connects the grid of MOSFET circuit; The output terminal of MCU circuit connects DC voltage measurement display circuit; Keyboard exports and connects MCU circuit; Serial port circuit and MCU circuit interconnection.
2. the three-phase intelligent electric-energy meter communication interface load capacity proving installation of band communication module according to claim 1, is characterized in that, described device adopts the electronic load formed for main circuit using MOSFET circuit as test load.
3. the three-phase intelligent electric-energy meter communication interface load capacity proving installation of band communication module according to claim 1, is characterized in that, described MCU circuit adopts TMS320LF2812 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236915.2U CN204679622U (en) | 2015-04-20 | 2015-04-20 | With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236915.2U CN204679622U (en) | 2015-04-20 | 2015-04-20 | With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module |
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| CN204679622U true CN204679622U (en) | 2015-09-30 |
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| CN201520236915.2U Expired - Fee Related CN204679622U (en) | 2015-04-20 | 2015-04-20 | With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699756A (en) * | 2016-04-25 | 2016-06-22 | 国网冀北电力有限公司电力科学研究院 | Electronic load ripple detection device |
| CN107132502A (en) * | 2017-05-09 | 2017-09-05 | 无锡市恒通电器有限公司 | A kind of RS485 communication test devices of electric energy meter |
| 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 |
| 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 |
| WO2024082075A1 (en) * | 2022-10-17 | 2024-04-25 | 福建网能科技开发有限责任公司 | Smart terminal hardware interface test system, and test method thereof |
-
2015
- 2015-04-20 CN CN201520236915.2U patent/CN204679622U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699756A (en) * | 2016-04-25 | 2016-06-22 | 国网冀北电力有限公司电力科学研究院 | Electronic load ripple detection device |
| CN107132502A (en) * | 2017-05-09 | 2017-09-05 | 无锡市恒通电器有限公司 | A kind of RS485 communication test devices of electric energy meter |
| 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 |
| 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 |
| WO2024082075A1 (en) * | 2022-10-17 | 2024-04-25 | 福建网能科技开发有限责任公司 | Smart terminal hardware interface test system, and test method thereof |
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| 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: 20150930 |