CN203337731U - Three-phase electric energy meter - Google Patents
Three-phase electric energy meter Download PDFInfo
- Publication number
- CN203337731U CN203337731U CN2013204498036U CN201320449803U CN203337731U CN 203337731 U CN203337731 U CN 203337731U CN 2013204498036 U CN2013204498036 U CN 2013204498036U CN 201320449803 U CN201320449803 U CN 201320449803U CN 203337731 U CN203337731 U CN 203337731U
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- electric energy
- energy meter
- computation chip
- sampling circuit
- phase electric
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Abstract
The utility model discloses a three-phase electric energy meter which comprises a power supply, a management MCU, a voltage sampling circuit, a current sampling circuit and a metering chip. An output end of the voltage sampling circuit is connected to an AD sampling end of the metering chip through a differential circuit. An output end of the current sampling circuit is connected to the AD sampling end of the metering chip through a differential circuit. The metering chip is connected to the management MCU through a SPI bus. The three-phase electric energy meter provided by the utility model has a very wide measuring range, and the maximum can reach 80 times of measuring range, far more than the measuring range of a traditional three-phase electric energy meter. Thus, specifications of an electric meter are greatly reduced, and production and maintenance costs are decreased.
Description
Technical field
The utility model relates to a kind of electric energy meter, particularly a kind of three-phase electric energy meter.
Background technology
Traditional three-phase electric energy meter is subject to the performance limitations of computation chip, and it is too large that the range of ammeter can not be done, in the requirement that meets the accuracy of measuring, generally can only accomplish 4 ~ 12 times, this causes the ammeter specification to be divided too much, is unfavorable for ammeter manufacturers produce and management, also is not easy to the user and uses.
The utility model content
The purpose of this utility model is to provide a kind of reliable and stable three-phase electric energy meter.
This three-phase electric energy meter that the utility model provides, comprise power module, management MCU, voltage sampling circuit, current sampling circuit and computation chip, the output terminal of voltage sampling circuit is connected with the AD sampling end of this computation chip by difference channel, the output terminal of current sampling circuit is connected with the AD sampling end of this computation chip by difference channel, and described computation chip is connected with management MCU by spi bus; The power supply of this computation chip is provided by power module.
Described computation chip adopts the computation chip that the model of IDT company is IDT90E36.
The utlity model has the range of non-constant width, maximum can reach the range of 80 times, considerably beyond the range of traditional three-phase electric energy meter, thereby has significantly reduced the ammeter specification, has reduced production and maintenance cost.
The accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises power module, management MCU, voltage sampling circuit, current sampling circuit and computation chip.The output terminal of voltage sampling circuit is connected with the AD sampling end of this computation chip by difference channel, and the output terminal of current sampling circuit is connected with the AD sampling end of this computation chip by difference channel, and computation chip is connected with management MCU by the high speed SPI bus.
Computation chip adopts the computation chip that the model of IDT company is IDT90E36.This chip has wide-range, high-precision characteristics, and the utility model is measured in a wide range and measures current signal and voltage signal by this computation chip.
Voltage sampling circuit and current sampling circuit respectively to A phase, B phase, the C phase three-phase voltage of input, current signal is sampled and nurse one's health, be converted into the voltage signal that meets the computation chip input requirements, then transfer to computation chip by difference channel.Computation chip carries out a series of processing such as PGA amplification, ADC sampling, compensation, filtering, DSP computing to the voltage signal of input; The data that again processing obtained are regularly read by spi bus by management MCU, and do further processing by management MCU.
The component parameters that voltage sampling circuit and current sampling circuit are used must meet the signal obtained of sampling and be no more than the requirement of the input range of computation chip, and should leave certain surplus.
As shown in Figure 1, management MCU of the present utility model is responsible for managing and controlling with display screen, key circuit, communication module, CF pulse module, clock module and storer etc.Display screen and key circuit are for realizing can showing and inquire about various electric parameters, logout, status information, user profile by human-computer interaction function; Communication module comprises one or several in RS485, far infrared, near infrared, GPRS, GSM, CDMA, small wireless, Ethernet, mainly completes information interaction, the setting parameter of electric energy meter and other peripherals; Clock module provides clock accurately and reliably for electric energy meter, for the time-shared charge of electric energy meter, logout etc. provide markers; Storer is used for storing the data messages such as electricity consumption data, monitor event record, load record and parameter configuration; The CF pulse module is for providing the port of calibrating electric energy meter measuring accuracy.
Power module is divided into three parts according to the difference of power supply object, is respectively the power circuit of management MCU, computation chip and relevant portion; The RS485 communication power supply circuit; Clock and low-power consumption battery.Front two parts power supply is that each power circuit obtains by three-phase voltage being carried out to the processing such as transformation, rectification, filtering, and clock and low-power consumption battery are to be equipped with and to provide separately.
Claims (2)
1. a three-phase electric energy meter, comprise power module, management MCU, voltage sampling circuit, current sampling circuit, it is characterized in that, this electric energy meter also comprises computation chip, the output terminal of voltage sampling circuit is connected with the AD sampling end of this computation chip by difference channel, the output terminal of current sampling circuit is connected with the AD sampling end of this computation chip by difference channel, and described computation chip is connected with management MCU by spi bus; The power supply of this computation chip is provided by power module.
2. three-phase electric energy meter according to claim 1, is characterized in that, described computation chip adopts the computation chip that the model of IDT company is IDT90E36.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204498036U CN203337731U (en) | 2013-07-26 | 2013-07-26 | Three-phase electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204498036U CN203337731U (en) | 2013-07-26 | 2013-07-26 | Three-phase electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203337731U true CN203337731U (en) | 2013-12-11 |
Family
ID=49706398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204498036U Expired - Lifetime CN203337731U (en) | 2013-07-26 | 2013-07-26 | Three-phase electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203337731U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901269A (en) * | 2014-04-01 | 2014-07-02 | 江南大学 | Electric quantity measuring device facilitating switching of wiring mode |
| CN107202919A (en) * | 2016-10-28 | 2017-09-26 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN108761160A (en) * | 2018-08-20 | 2018-11-06 | 贵州电网有限责任公司 | A kind of electric energy meter legality measurement and non-legal system functional hardware separated structure |
-
2013
- 2013-07-26 CN CN2013204498036U patent/CN203337731U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901269A (en) * | 2014-04-01 | 2014-07-02 | 江南大学 | Electric quantity measuring device facilitating switching of wiring mode |
| CN107202919A (en) * | 2016-10-28 | 2017-09-26 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN107202919B (en) * | 2016-10-28 | 2019-12-13 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN108761160A (en) * | 2018-08-20 | 2018-11-06 | 贵州电网有限责任公司 | A kind of electric energy meter legality measurement and non-legal system functional hardware separated structure |
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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: 20131211 |