CN202362363U - Wide range single-phase electric energy meter - Google Patents
Wide range single-phase electric energy meter Download PDFInfo
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- CN202362363U CN202362363U CN2011203913155U CN201120391315U CN202362363U CN 202362363 U CN202362363 U CN 202362363U CN 2011203913155 U CN2011203913155 U CN 2011203913155U CN 201120391315 U CN201120391315 U CN 201120391315U CN 202362363 U CN202362363 U CN 202362363U
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Abstract
The utility model provides a wide range single-phase electric energy meter design which includes a microcontroller and is characterized in that the microcontroller is connected with a wide range metering chip. Compared with the prior art, the single-phase electric energy meter has a wider metering range. The metering range of a conventional electric energy meter is about 4 to 8 times, and the metering range of the wide range single-phase electric energy meter is 1(80)A, i.e.80 times. The current measuring range is 0.01A to 80A, so requirements of different periods and from different users can be satisfied. The wide range single-phase electric energy meter can meter the distributed power generating capacities of the residential electricity consumption, the small size fan, the solar energy, and the like, and the active electric energy can satisfy the national standard 1.0 level under the big dynamic shock load condition. The design scheme brings conveniences for production, and various standard meters with the biggest range being under 80A can adopt the same product in future, so the production and the material preparation become easy. The wide range single-phase electric energy meter effectively reduces the power system line loss, and is more suitable for the development of the modern society, and makes contribution to energy conservation and environmental protection.
Description
Technical field
The utility model relates to the electric energy meter field, relates in particular to single-phase electric energy meter, specifically a kind of wide-range single-phase electric energy meter.
Background technology
Current social economy high speed development, the power consumption of family and enterprise is increasing, and therefore the measurement range to the electric energy meter meter requires increasing.Existing electric energy meter majority is 4 times of journey tables, and promptly the fundamental measurement electric current of electric current is I
b, and maximum measurement range is 4I
bThe national standard of existing 1.0 grades of electric energy meter measuring error is as shown in table 1:
Table 1: active electric energy meter percent error
The measuring error of light condition is than big many of electric energy meter grade error in the standard.With 1.0 grades of tables is example, and the grade error criterion of 1.0 grades of tables is 1.0%, and to require at the light condition time error be 1.5%.
During using, life, generally to select I in order to satisfy the demand of electric current wide-measuring range
bBigger electric energy meter; The inaccurate gage work scope of electric energy meter is increased; And because the use of a large amount of energy-saving electric appliances, family and enterprise with electricity condition may the little electric current of long time treatment, light condition, cause electric energy meter to be in for a long time and measure inaccurate state.Along with growth in the living standard, the continuous increase of power consumption need be changed I according to user's demand
bThe electric energy meter of bigger current specification just satisfies user's needs, is prone to cause waste.
The design of wide-range electric energy meter will bring more convenience for production, and each specification range electric energy meter all can adopt with a product, for production get the raw materials ready bring certain convenient.
Summary of the invention
What the utility model will solve is existing electric energy meter big problem of measuring error when underloading, and purpose provides a wide-range single-phase electric energy meter, makes electric energy meter when underloading, also can reach higher measuring accuracy.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts is: a kind of wide-range electric energy meter; Comprise microcontroller, power circuit, metering circuit, infrared communication circuit, 485 communicating circuits, ESAM module and memory circuitry, display circuit, clock circuit, test pulse output circuit and multi-functional output circuit; Described metering circuit comprises current sampling circuit, signal conditioning circuit, voltage signal sampling circuit and metering treatment circuit; It is characterized in that described current sampling circuit adopts the current transformer of high anti-direct current ability, described metering treatment circuit adopts 90E23 individual event computation chip; Described signal conditioning circuit comprises resistance R 15, resistance R 94, resistance R 95, resistance R 25, capacitor C 4 and capacitor C 6; One end of the Secondary Winding of the end summation current transformer of one terminating resistor R94 of resistance R 15; One end of another termination capacitor C 4 of resistance R 15 and 10 pin of single-phase computation chip; One end of the other end of the other end connecting resistance R95 of resistance R 94, the other end of capacitor C 4, capacitor C 6 and ground, the other end of the other end connecting resistance R25 of capacitor C 6 and 11 pin of single-phase computation chip; 24,25,26,27 pin of described single-phase computation chip through filtering circuit respectively with microcontroller circuit in 30,28,27,26 pin of microprocessor be connected.
The wide-range single-phase electric energy meter of the utility model, signal conditioning circuit makes it to satisfy sample circuit to just going into the requirement of signal to just going into signal through the row conditioning.The current transformer of high anti-direct current ability guarantees when the little current sample of underloading, still to have good degree of accuracy; Single-phase computation chip in the metering circuit is sampled voltage signal and the current signal of input and is handled; Handle active energy, voltage effective value, live wire current effective value, the neutral line current effective value of back gained; Active power, electric voltage frequency, power factor are read by microcontroller circuit, and are presented at display interface.Microprocessor is the core devices of control section, and its main effect is the operation of accomplishing the electric energy meter Control Software, and carries out communication and exchanges data in external unit and other devices.Storer is the place of supplemental characteristic and logout storage, and display circuit is the interface that is used to show Various types of data.Clock circuit is the time source of electric energy meter, is the clock reference in time-sharing measurement.Power circuit is for whole watch circuit power supply to be provided.Infrared communication and 485 communications are in order to realize electric energy meter and outside data communication and exchange.The test pulse output circuit produces the calibration pulse, is used for the verification of electric energy meter.Multi-functional output circuit is an output clock pps pulse per second signal, is used to check the accuracy of clock frequency second, and also exportable period switching changes signal.The ESAM module is to be used for data check, and after the external world gave the electric energy meter order, microcontroller met at ESAM with command frame and does data authentication, and implemented command instruction according to authentication result, guarantees the security that data and order are implemented.
That above-mentioned single-phase computation chip adopts is IDT 90E23, and IDT 90E23 has in 5000: 1 dynamic ranges wattful power messurement error less than 0.1% special-purpose computation chip.That microprocessor adopts is μ PD78F0526A, and it carries out exchanges data with metering IDT 90E23 through SPI mouth wire protocol and 4 data lines.
The electric energy meter of the utility model has mainly been accomplished single-phase user's electricity consumption metering; And have functions such as time-sharing measurement, demonstration, communication, storage, clock; Can accurately measure residential electricity consumption, small-sized fan, sun power distributed power supply generated energy, in the circuit measuring scope of 0.01A-80A, reach active energy and satisfy GB 1.0 classification standards.Effectively reduce grid line loss, more can adapt to development of modern society, for energy-saving and environmental protection contribute.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the structured flowchart of the utility model.
Fig. 2 is the circuit diagram of the utility model, wherein:
Fig. 2 (1) is the circuit diagram of the display circuit of the utility model;
Fig. 2 (2) is the computation chip and the peripheral circuit diagram thereof of the utility model;
Fig. 2 (3) is the live wire sample rate current modulate circuit figure of the utility model;
Fig. 2 (4) is the zero line sample rate current modulate circuit figure of the utility model;
Fig. 2 (5) is the voltage sampling circuit figure of the utility model;
Fig. 2 (6) is the filtering circuit figure of the utility model;
Fig. 2 (7) is the test pulse output circuit figure of the utility model;
Fig. 2 (8) is the power-fail detection circuit figure of the utility model;
Fig. 2 (9) is the power circuit diagram of the utility model;
Fig. 2 (10) is the key circuit figure of the utility model;
Fig. 2 (11) is the microcontroller circuit figure of the utility model;
Fig. 2 (12) is the 485 telecommunication circuit figure of the utility model;
Fig. 2 (13) is the multi-functional output circuit figure of the utility model;
Fig. 2 (14) is the optical circuit figure fully of the utility model;
Fig. 2 (15) is the circuit diagram of operating a switch in the control relay circuit of the utility model;
Fig. 2 (16) is the memory circuitry figure of the utility model;
Fig. 2 (17) is the ESAM circuit diagram of the utility model;
Fig. 2 (18) is the infrared emission circuit diagram of the utility model;
Fig. 2 (19) is the infrared receiving circuit figure of the utility model;
Fig. 2 (20) is the program debug circuit diagram of the utility model;
Fig. 2 (21) fires circuit diagram for the program of the utility model;
Fig. 2 (22) is the clocking scheme of the utility model.
Fig. 2 (23) is the temperature sensing circuit figure of the utility model;
Embodiment
With reference to Fig. 1; The wide-range electric energy meter of the utility model; Comprise microcontroller, power circuit, metering circuit, infrared communication circuit, 485 communicating circuits, ESAM module and memory circuitry, display circuit, clock circuit, test pulse output circuit, multi-functional output circuit and control relay circuit; Described control relay circuit comprises operate a switch circuit and combined floodgate circuit, and described metering circuit comprises current sampling circuit, signal conditioning circuit, voltage signal sampling circuit and metering treatment circuit.
With reference to Fig. 2, the analytic accounting amount sampling channel of described current sampling circuit adopts the current transformer of high anti-direct current ability, and described metering treatment circuit adopts IDT90E23 individual event computation chip U1; Described signal conditioning circuit comprises resistance R 15, resistance R 94, resistance R 95, resistance R 25, capacitor C 4 and capacitor C 6; One end of the Secondary Winding of the end summation current transformer of one terminating resistor R94 of resistance R 15; One end of another termination capacitor C 4 of resistance R 15 and 10 pin of single-phase computation chip; One end of the other end of the other end connecting resistance R95 of resistance R 94, the other end of capacitor C 4, capacitor C 6 and ground, the other end of the other end connecting resistance R25 of capacitor C 6 and 11 pin of single-phase computation chip; 24,25,26,27 pin of described single-phase computation chip through filtering circuit respectively with microcontroller circuit in 30,28,27,26 pin of microprocessor U11 be connected.
In addition, the utility model also has filtering circuit, power-fail detection circuit, key circuit, optical circuit, program debug circuit, program are fired circuit and temperature sensing circuit fully.
Each item performance index of the utility model are following:
Class of accuracy: meritorious 1 grade
Transformation frequency: 50Hz
Reference voltage: 220V
Current specification: 1 (80) A
Meter constant: 1600imp/kWh
Operating voltage range: 0.7Un～1.2Un
Operating temperature range :-25～65 ℃
Voltage circuit power consumption: non-communications status≤0.8W and 5VA, communications status≤2W and 12VA
Current circuit power consumption :≤2.5VA
Fundamental error:
Claims (3)
1. wide-range single-phase electric energy meter; A kind of wide-range electric energy meter; Comprise microcontroller, power circuit, metering circuit, infrared communication circuit, 485 communicating circuits, ESAM module and memory circuitry, display circuit, clock circuit, test pulse output circuit and multi-functional output circuit; Described metering circuit comprises current sampling circuit, signal conditioning circuit, voltage signal sampling circuit and metering treatment circuit; It is characterized in that described current sampling circuit adopts the current transformer of high anti-direct current ability, described metering treatment circuit adopts 90E23 individual event computation chip; Described signal conditioning circuit comprises resistance R 15, resistance R 94, resistance R 95, resistance R 25, capacitor C 4 and capacitor C 6; One end of the Secondary Winding of the end summation current transformer of one terminating resistor R94 of resistance R 15; One end of another termination capacitor C 4 of resistance R 15 and 10 pin of single-phase computation chip; One end of the other end of the other end connecting resistance R95 of resistance R 94, the other end of capacitor C 4, capacitor C 6 and ground, the other end of the other end connecting resistance R25 of capacitor C 6 and 11 pin of single-phase computation chip; 24,25,26,27 pin of described single-phase computation chip through filtering circuit respectively with microcontroller circuit in 30,28,27,26 pin of microprocessor be connected.
2. wide-range single-phase electric energy meter as claimed in claim 1 is characterized in that described microprocessor is μ PD78F0526A.
3. wide-range single-phase electric energy meter as claimed in claim 1 is characterized in that also comprising filtering circuit, power-fail detection circuit, key circuit, circuit and temperature sensing circuit are fired in charge road, the circuit of operating a switch, program debug circuit, program fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203913155U CN202362363U (en) | 2011-10-14 | 2011-10-14 | Wide range single-phase electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203913155U CN202362363U (en) | 2011-10-14 | 2011-10-14 | Wide range single-phase electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202362363U true CN202362363U (en) | 2012-08-01 |
Family
ID=46573541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203913155U Expired - Lifetime CN202362363U (en) | 2011-10-14 | 2011-10-14 | Wide range single-phase electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202362363U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990382A (en) * | 2017-02-10 | 2017-07-28 | 国网浙江台州市黄岩区供电公司 | Impact load is to electric energy metering error remote monitoring method |
| CN107064587A (en) * | 2016-12-13 | 2017-08-18 | 浙江恒业电子有限公司 | A kind of electric energy meter circuit |
-
2011
- 2011-10-14 CN CN2011203913155U patent/CN202362363U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064587A (en) * | 2016-12-13 | 2017-08-18 | 浙江恒业电子有限公司 | A kind of electric energy meter circuit |
| CN106990382A (en) * | 2017-02-10 | 2017-07-28 | 国网浙江台州市黄岩区供电公司 | Impact load is to electric energy metering error remote monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |