CN202916335U - Three-phase current meter based on single-phase metering chip - Google Patents
Three-phase current meter based on single-phase metering chip Download PDFInfo
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- CN202916335U CN202916335U CN 201220466740 CN201220466740U CN202916335U CN 202916335 U CN202916335 U CN 202916335U CN 201220466740 CN201220466740 CN 201220466740 CN 201220466740 U CN201220466740 U CN 201220466740U CN 202916335 U CN202916335 U CN 202916335U
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Abstract
The utility model provides a three-phase current meter based on a single-phase metering chip. The three-phase current meter based on the single-phase metering chip comprises a current sampling module which accesses a power grid and samples the phase current of the power grid; a metering unit which carries out metering computation on the sampled phase current to acquire current, frequency, active electric power and reactive electric power data and is connected with the current sampling module; a MCU controller which is used for processing acquired data, is connected with the metering unit, and accesses a display unit, a communication module and a key signal processing module. The three-phase current meter based on the single-phase metering chip is characterized in that the metering module is the single-phase metering chip. According to the utility model, the three-phase current meter based on the single-phase metering chip has the advantages that due to the fact that the single-phase metering chip with 19 AD bits is used to collect the three-phase current, the three-phase current meter has the advantages of high collection precision, simple interface circuit, convenient application and low cost.
Description
Technical field
The invention belongs to the commercial measurement metering field, especially relates to a kind of three phase ammeter of the high precision electro flow measurement for current supply circuit.
Background technology
Development along with China's Electric automation technology, the automaticity of electric power application is also more and more higher, requirement to measuring accuracy is also more and more higher, the digital displaying meter of so original pointer instrument or low precision obviously can not satisfy application requirements, therefore the acquisition precision of metering instrument in urgent need to be improved unit.
Summary of the invention
The invention provides a kind of three phase ammeter based on the single-phase measurement chip for addressing the above problem, and adopts cost computation chip low, that precision is high to carry out AD and gathers.
For solving the problems of the technologies described above, the technical scheme that the invention is adopted is: a kind of three phase ammeter based on the single-phase measurement chip comprises: access electrical network and the current sampling module that the phase current of electrical network is taken a sample; Phase current to sampling carries out calculating correction values, obtains the metering units of electric current, frequency, active energy and reactive energy data, and it connects current sampling module; For the MCU controller that the data that obtain are processed, it connects metering units, and access display unit, communication module and push button signalling processing module.
Press such scheme, described current sampling module is current transformer; Described metering units is the single-phase measurement chip, and this single-phase measurement chip is connected with MCU by the SPI interface; Described single-phase measurement chip is the ATT7053BU of huge spring photoelectricity Science and Technology Co., Ltd.; The PIC18F45K80 single-chip microcomputer that described MCU controller is Microchip company; Described display unit is the LED display of access MCU controller; Described communication module is the RS485 communication interface of access MCU controller, and described communication module is used for the MCU controller and external unit carries out exchanges data; Described push button signalling processing module comprises the triggering button, and described triggering button enters Parameter Programming for the user pattern is set, and carries out checking and arranging of parameter; Described reometer accesses electrical network with three-phase and four-line, among current sampling module access phase line A, phase line B and the phase line C, and zero line access metering units.
Advantage and good effect that the invention has are: owing to adopting single-phase measurement chip ATT7053 as the AD acquisition chip, its AD figure place can reach 19, can realize high-precision current signal measurement; On the other hand, the interface loop of this reometer is simple, and it is convenient to use, and cost of manufacture is low.
Description of drawings
Fig. 1 is the electrical structure schematic diagram of the invention
Embodiment
As shown in Figure 1, the invention provides a kind of three phase ammeter based on the single-phase measurement chip, comprising: access electrical network and the current sampling module that the phase current of electrical network is taken a sample; Phase current to sampling carries out calculating correction values, obtains the metering units of electric current, frequency, active energy and reactive energy data, and it connects current sampling module; For the MCU controller that the data that obtain are processed, it connects metering units, and access display unit, communication module and push button signalling processing module.Described reometer accesses electrical network with three-phase and four-line, among current sampling module 1 access phase line A, phase line B and the phase line C, and zero line access metering units; Described current sampling module is current transformer; Described metering units is the single-phase measurement chip, and this single-phase measurement chip is connected with the MCU controller by the SPI interface; Described display unit is the LED display of access MCU controller; Described communication module is the RS485 communication interface of access MCU controller; Described push button signalling processing module comprises the triggering button.
The course of work of this example: the user touches button and enters Parameter Programming pattern is set, and carries out checking and arranging of parameter, and the program that the user arranges is passed to the MCU controller; Current sampling module accesses electrical network by the mode of three-phase and four-line, and by current transformer the electrical network phase current is taken a sample, current signal after the sampling enters metering units and calculates, the data obtained imports the MCU controller into by the SPI interface after calculating, the MCU controller is processed the data that the single-phase measurement chip imports into according to user's setting program, signal after the processing is shown to the user by LED display, and can carry out remote data transmission by the RS843 interface.
An above embodiment to the invention has been described in detail, but described content only is the preferred embodiment of the invention, can not be considered to for the practical range that limits the invention.All equalizations of doing according to the invention application range change and improve etc., all should still belong within the patent covering scope of the invention.
Claims (9)
1. three phase ammeter based on the single-phase measurement chip comprises:
Access electrical network and the current sampling module that the phase current of electrical network is taken a sample;
Phase current to sampling carries out calculating correction values, obtains the metering units of electric current, frequency, active energy and reactive energy data, and it connects current sampling module;
For the MCU controller that the data that obtain are processed, it connects metering units, and access display unit, communication module and push button signalling processing module.
2. the three phase ammeter based on the single-phase measurement chip according to claim 1, it is characterized in that: described current sampling module is current transformer.
3. the three phase ammeter based on the single-phase measurement chip according to claim 1, it is characterized in that: described metering units is the single-phase measurement chip, this single-phase measurement chip is connected with MCU by the SPI interface.
4. the three phase ammeter based on the single-phase measurement chip according to claim 3 is characterized in that: described single-phase measurement chip is the ATT7053BU of huge spring photoelectricity Science and Technology Co., Ltd..
5. the three phase ammeter based on the single-phase measurement chip according to claim 1 is characterized in that: the PIC18F45K80 single-chip microcomputer that described MCU controller is Microchip company.
6. the three phase ammeter based on the single-phase measurement chip according to claim 1 is characterized in that: described display unit is the LED display of access MCU controller.
7. the three phase ammeter based on the single-phase measurement chip according to claim 1 is characterized in that: described communication module is the RS485 communication interface of access MCU controller, and described communication module is used for the MCU controller and external unit carries out exchanges data.
8. the three phase ammeter based on the single-phase measurement chip according to claim 1, it is characterized in that: described push button signalling processing module comprises the triggering button, described triggering button is used for the user and enters Parameter Programming pattern is set, and carries out checking and arranging of parameter.
9. according to claim 1 to 8 any one described three phase ammeter based on the single-phase measurement chip, it is characterized in that: described reometer accesses electrical network with three-phase and four-line, among current sampling module access phase line A, phase line B and the phase line C, and zero line access metering units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220466740 CN202916335U (en) | 2012-09-13 | 2012-09-13 | Three-phase current meter based on single-phase metering chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220466740 CN202916335U (en) | 2012-09-13 | 2012-09-13 | Three-phase current meter based on single-phase metering chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916335U true CN202916335U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220466740 Expired - Fee Related CN202916335U (en) | 2012-09-13 | 2012-09-13 | Three-phase current meter based on single-phase metering chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678159A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Industrial three-phase isolation ampere meter |
| CN105954575A (en) * | 2015-12-27 | 2016-09-21 | 天津市品通电力科技有限公司 | Electric power microcomputer protection circuit |
-
2012
- 2012-09-13 CN CN 201220466740 patent/CN202916335U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678159A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Industrial three-phase isolation ampere meter |
| CN105954575A (en) * | 2015-12-27 | 2016-09-21 | 天津市品通电力科技有限公司 | Electric power microcomputer protection circuit |
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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 |
Granted publication date: 20130501 Termination date: 20150913 |
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| EXPY | Termination of patent right or utility model |