CN202693670U - Digital readout network instrument - Google Patents
Digital readout network instrument Download PDFInfo
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- CN202693670U CN202693670U CN 201220279785 CN201220279785U CN202693670U CN 202693670 U CN202693670 U CN 202693670U CN 201220279785 CN201220279785 CN 201220279785 CN 201220279785 U CN201220279785 U CN 201220279785U CN 202693670 U CN202693670 U CN 202693670U
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Abstract
The utility model relates to the field of an electric instrument and discloses a digital readout network instrument. The digital readout network instrument provided by the utility model comprises an insulating shell and a control circuit board located inside the shell, wherein the control circuit board comprises a power supply sampling board, a main board and an input-output board; the power supply sampling board and the input-output board are respectively electrically connected with the main board through a contact pin; the power supply sampling board is used for collecting analogue signals of voltage and current, converting the analogue signals into digital signals, and conveying the digital signals to the main board; the main board is used for carrying out main control on the digital readout network instrument, and calculating current, voltage, power, electricity and harmonic wave values through the received digital signals, and displaying the values; and the input-output board is used for providing an input-output channel of the information. The digital readout network instrument provided by the utility model can be used for measuring the electric energy data such as current, voltage, power, electricity and harmonic wave, and has the characteristics of high precision, good stability, strong anti-jamming capability, clear reading, small volume, easiness of installation and operation, vibration resistance, high durability and the like.
Description
Technical field
The utility model relates to the electric instrument field, relates in particular to a kind of digital display network instrument.
Background technology
Multifunctional electric energy meter refers to also have the two or more functions such as timesharing, measuring electric quantity, and can show except meritorious (idle) power of metering, the electric energy meter of storage and output data.At present, when being used for measuring electric energy for traditional multifunctional electric energy meter, two kinds of methods are arranged generally: (1) uses special-purpose electric energy metrical IC and digital signal processing DSP or micro-control unit MCU that data are processed; (2) front end uses analog to digital conversion AD chip to carry out sampled data, and the rear end uses field programmable gate array FPGA that the data that gather are processed.If adopt the method for (1), just can not satisfy the demand that multifunctional electric energy meter is measured the electric energy datas such as harmonic wave; If use the method for (2) pure hardware, just also need extra micro-control unit MCU to come the control functions such as processes and displays, communication, thereby just increased hardware cost.
The utility model content
The purpose of the utility model embodiment is: a kind of digital display network instrument is provided, can measure the energy datas such as electric current, voltage, power, electric weight, harmonic wave, have that precision is high, good stability, antijamming capability are strong, clear reading, volume are little, be easy to installation and operation, antidetonation, the characteristics such as durable.
A kind of digital display network instrument that the utility model embodiment provides comprises insulation crust and the control circuit board that is positioned at described enclosure; Described control circuit board comprises power acquisition model, mainboard and input/output board; Described power acquisition model links to each other by the contact pin electricity with described mainboard respectively with described input/output board; Described power acquisition model is used for gathering the simulating signal of voltage, electric current and is converted into digital data transmission to described mainboard; Described mainboard is used for described digital display network instrument overall control, calculates electric current, voltage, power, electric weight, harmonic value by the digital signal that receives simultaneously and shows; Described input/output board is used to provide the IO channel of information.
Optionally, described power acquisition model adopts the AD73360 chip of U.S. ADI company as acp chip.
Optionally, described mainboard adopts the LPC2136 chip as main control chip.
Optionally, also be provided with voltage transformer (VT), current transformer, signal conditioning circuit and analog to digital converter on the described power acquisition model.
Optionally, also be provided with display module on the described mainboard; Described display module comprises that two LED drive chip ZLG7290, three buttons and three LED pipes.
Optionally, be provided with 485 communication interfaces, two output ports and three input ports in the described input and output version.
Therefore, use the technical scheme of the utility model embodiment, to measure electric current in order to solve multifunctional electric energy meter, voltage, power, the requirement of the electric fluxs such as harmonic wave, reduce simultaneously by a micro-control unit MCU, reduce simultaneously the requirement of hardware complexity and cost, adopt simple three blocks of plates, it is the power acquisition model, mainboard and input/output board, wherein, the acp chip AD73360 of described power acquisition model is used for gathering voltage, the simulating signal of electric current and be converted to 16 digital signal, then transfer to the main control chip LPC2136 of described mainboard, described main control chip LPC2136 processes the digital signal that receives, to whole digital display network instrument overall control, not only can satisfy the requirement of measuring the electric fluxs such as harmonic wave simultaneously, also reduce the cost of product simultaneously.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, does not consist of to improper restriction of the present utility model, in the accompanying drawings:
The structured flowchart of a kind of digital display network instrument that Fig. 1 provides for the utility model embodiment;
The circuit theory diagrams of the power acquisition model in a kind of digital display network instrument that Fig. 2 provides for the utility model embodiment.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the utility model in this illustrative examples of the present utility model and explanation, but not as to restriction of the present utility model.
Embodiment:
As shown in Figure 1, digital display network instrument described in the utility model, comprise the first shell of volume and the control circuit board that is positioned at described enclosure, described control circuit board comprises power acquisition model 1, mainboard 2 and input/output board 3, and described power acquisition model 1 links to each other by the contact pin electricity with described mainboard 2 respectively with described input/output board 3.Wherein, the AD73360 chip that described power acquisition model 1 adopts U.S. ADI company is used for gathering the simulating signal of voltage, electric current as acp chip, and is converted into digital data transmission to described mainboard 2.Described power acquisition model 1 also is provided with voltage transformer (VT), current transformer, signal conditioning circuit and analog to digital converter, wherein, described voltage transformer (VT), ac high voltage is changed into can be for the voltage of measuring; Described current transformer, alternating current is converted to can be for measuring electric current; Described signal conditioning circuit is transformed to simulating signal the digital signal of data acquisition; Described analog to digital converter becomes digital signal with analog signal conversion.Described mainboard 2 adopts the LPC2136 chip of ARM7 as main control chip, be used for described digital display network instrument overall control, calculate electric current, voltage, power, electric weight, harmonic value by the digital signal that receives simultaneously and show, also be provided with display module, described display module comprises that two LED drive chip ZLG7290, three buttons and three LED pipes; Described input/output board 3 is provided with 485 communication interfaces, two output ports and three input ports, is used for providing the IO channel of information.
Three-phase voltage, three-phase current AC signal are connected to the AD73360 chip through described voltage transformer (VT), current transformer and signal conditioning circuit, described analog to digital converter is with the three-phase voltage voltage and the three-phase current that collect, and namely the series analog memory amount data of 6 passages are according to 16 De ﹠amp of U.S. ADI company; Sum-
The sequential of A/D chip AD73360 converts the serial data of 6 passages of input to parallel data, and is stored among the corresponding ferroelectric memory FIFO.The ferroelectric memory access FIFO of described 6 passages keeps the AD data by 1 cycle of 6 passages of described analog to digital converter conveying, links to each other with described mainboard 2 by MOSI1, ADSE, MCLK, MIS01, SCK1, SDFS, ADRES interface.Then the main control chip LPC2136 of described mainboard 2 calculates electric current, voltage, power, electric weight, harmonic value by being equal to computing method by high-precision each cycle digital voltage of 16, the digital current data obtained of SSP interface.Simultaneously, two LED adopting of described display module drive chip ZLG7290 finish demonstration, inquiry and the parameter of total data by described three buttons and three LED pipes setting; Three input ports in the described input/output board 3, two output ports link to each other with described mainboard 2 respectively with 485 interfaces, realize data acquisition and remote transmission.
As shown in Figure 2, circuit theory diagrams for power acquisition model in the digital display network instrument described in the utility model, wherein, 11 ~ 17 pin of described AD73360 chip is by 1 ~ 7 corresponding connection of contact pin with described LPC2136 chip, in conjunction with these circuit theory diagrams, can understand better the circuit of digital display network instrument described in the utility model and realize simultaneously.
At first described sampling plate 1 connects aanalogvoltage and analog current to be measured by measurement interface.Voltage parallel wherein, current-series, namely so that voltage sample and current sample are divided into two classes:
(1) voltage sample: analog voltage signal UA, UB, a UC Asia bright resistance R V2 in parallel with the UN among, RV3, RV4, described voltage dependent resistor (VDR) plays overvoltage protection, the unrestrained voltage that gushes.UA, UB, UC enter voltage transformer pt 103, PT102, PT101 input end crossing respectively one-level RC filtering circuit, each sampled point road R106 in parallel, R105, R104 in output terminal pass through respectively AD signal input part (UAP, UAN), (UBP, UBN), (UCP, the UCN) that one-level RC filtering circuit enters the AD73360 chip again.
(2) current sample: current signal IA, IB, IC are connected to the input end of Current Transmit 103, CT102, CT101, each sampling resistor R103, a R102 in parallel, R101 in output terminal are at the AD signal input part (IAP, IAN), (IBP, IBN), (ICP, the ICN) that enter respectively the AD73360 chip through one-level RC filtering circuit.
The three-phase voltage of above-mentioned 6 passages, the analog input of three-phase current signal link to each other with sampling plate 1 by MOSI1, ADSE, MCLK, MISO1, SCK1, ADFS, ADRES pin behind the AD73360 chip.Described sampling plate 1 adopts the LPC2136 chip, obtains 16 high-precision each periodic voltage, current data by the SSP interface, calculates electric current, voltage power, electric weight, harmonic value the synchronous computing method such as passing through.
In Fig. 1, LPC2136 is connected with power acquisition model 1 and input/output board as main control chip by pin, and internal software adopts uC/OS II real-time multi-task operating system, and data transmission adopts Modbus communication protocol.
This multifunctional digital network instrument has adopted advanced AC Data and fuzzy control power back-off technology, take 32 ARM7 microprocessor LPC2136 as core, it is the multifunctional electric meter that integrates sensor, transmitter, data acquisition, demonstration, long-distance transmissions.It has that precision is high, good stability, antijamming capability are strong, clear reading, volume are little, be easy to installation and operation, antidetonation, the characteristics such as durable, can directly substitute traditional pointer instrument.Both can locally use, can form monitor network by RS485 interface teletransmission data again, be widely used in the distribution system or Automatic monitoring systems of the every profession and trades such as electric power, petrochemical complex, metallurgy, machinery, building.
The above technical scheme that the utility model embodiment is provided is described in detail, used specific case herein principle and the embodiment of the utility model embodiment are set forth, the explanation of above embodiment is only applicable to help to understand the principle of the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, all will change on embodiment and range of application, in sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. digital display network instrument is characterized in that:
Comprise insulation crust and the control circuit board that is positioned at described enclosure;
Described control circuit board comprises power acquisition model, mainboard and input/output board;
Described power acquisition model links to each other by the contact pin electricity with described mainboard respectively with described input/output board;
Described power acquisition model is used for gathering the simulating signal of voltage, electric current and is converted into digital data transmission to described mainboard;
Described mainboard is used for described digital display network instrument overall control, calculates electric current, voltage, power, electric weight, harmonic value by the digital signal that receives simultaneously and shows;
Described input/output board is for the IO channel that information is provided.
2. digital display network instrument according to claim 1 is characterized in that:
Described power acquisition model adopts the AD73360 chip of U.S. ADI company as acp chip.
3. digital display network instrument according to claim 1 is characterized in that:
Described mainboard adopts the LPC2136 chip as main control chip.
4. digital display network instrument according to claim 1 is characterized in that:
Also be provided with voltage transformer (VT), current transformer, signal conditioning circuit and analog to digital converter on the described power acquisition model.
5. digital display network instrument according to claim 1 is characterized in that:
Also be provided with display module on the described mainboard;
Described display module comprises that two LED drive chip ZLG7290, three buttons and three LED pipes.
6. digital display network instrument according to claim 1 is characterized in that:
Be provided with 485 communication interfaces, two output ports and three input ports in the described input and output version.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220279785 CN202693670U (en) | 2012-06-14 | 2012-06-14 | Digital readout network instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220279785 CN202693670U (en) | 2012-06-14 | 2012-06-14 | Digital readout network instrument |
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| CN202693670U true CN202693670U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220279785 Expired - Fee Related CN202693670U (en) | 2012-06-14 | 2012-06-14 | Digital readout network instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941084A (en) * | 2014-05-13 | 2014-07-23 | 上海电气集团股份有限公司 | MuCOS (Micro Control Operation System) operating system based intelligent electric meter |
| CN104319194A (en) * | 2014-10-29 | 2015-01-28 | 天正集团有限公司 | Electric meter leakage protector |
| CN113075447A (en) * | 2021-02-04 | 2021-07-06 | 浙江华云信息科技有限公司 | Intelligent detection device and method for 400V low-voltage distribution network |
-
2012
- 2012-06-14 CN CN 201220279785 patent/CN202693670U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941084A (en) * | 2014-05-13 | 2014-07-23 | 上海电气集团股份有限公司 | MuCOS (Micro Control Operation System) operating system based intelligent electric meter |
| CN104319194A (en) * | 2014-10-29 | 2015-01-28 | 天正集团有限公司 | Electric meter leakage protector |
| CN113075447A (en) * | 2021-02-04 | 2021-07-06 | 浙江华云信息科技有限公司 | Intelligent detection device and method for 400V low-voltage distribution network |
| CN113075447B (en) * | 2021-02-04 | 2024-06-18 | 浙江华云信息科技有限公司 | 400V low-voltage distribution network intelligent detection device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130123 Termination date: 20140614 |
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| EXPY | Termination of patent right or utility model |