CN1690719A - Electric quantity monitor with communication interfaces - Google Patents
Electric quantity monitor with communication interfaces Download PDFInfo
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- CN1690719A CN1690719A CN 200410017894 CN200410017894A CN1690719A CN 1690719 A CN1690719 A CN 1690719A CN 200410017894 CN200410017894 CN 200410017894 CN 200410017894 A CN200410017894 A CN 200410017894A CN 1690719 A CN1690719 A CN 1690719A
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Abstract
The present invention relates to electric quantity monitor device with communication interface belonged to electric control measurement technique field. The device comprises circuits of signal input, signal process, communication, display and power source, characterized in that the signal input comprises current input and voltage input circuit; signal processing circuit is MCU, processes data and send to up machine; display circuit combines serial-to-parallel converter chip and latch; the signal transmission of aforementioned is: after processing, operate quickly, send to display circuit, and communicate with communication circuit according to need. It also need combination with software comprised three phase switch by turns and measurement for every phase. The effect is: combine hardware design of modularization and software, small volume, simple circuit and low cost. It is fit to replace the older and has well benefit.
Description
Technical field
The present invention relates to a kind of electric weight monitor, belong to automatically controlled field of measuring technique with communication interface.
Background technology
The electric weight monitor is electric weight such as the three-phase voltage that is used for measuring a certain branch road of electronics distribution system, three-phase current, active power, reactive power, power factor, the ruuning situation that directly reflects this branch road, has local Presentation Function, can on instrument face plate, directly show related parameter, and has a communication interface, mainly contain MODBUS and DeviceNet interface, can insert corresponding data network.In distribution system, need only an amount of monitor of configuration and just can grasp the operation conditions of total system.
The situation of prior art is: abroad each electric corporation is at the electric weight monitor of release the late nineteen eighties, in recent years the monitor that the band field-bus interface occurs, ECOMonitor (CC-Link interface) as Japanese mitsubishi electric, the IQ2000 of U.S. Culter-Hammer (PowerNet interface), the DIRIS (MODBUS interface) of France Socomec, domestic enterprise is also just developing similar products and is coming into operation, but communication interface is general more single, uses the MODBUS interface.
Summary of the invention
The object of the present invention is to provide a kind of have communication interface, circuit electric weight monitor simple, easy to use, this measuring instrument is in measuring accuracy, guarantees on the consistance of all product precision progressive to some extent.
In order to achieve the above object, solution of the present invention is: the hardware one-piece construction comprises the signal input, and signal Processing shows, communication and several parts of power supply, it is characterized in that: described signal input circuit comprises current signal input circuit and voltage signal input circuit; Described signal processing circuit comprises the master chip processing section, after data processing, delivers to the display part and shows.Communicating circuit carries out DeviceNet or MODBUS communication as required.The software of this solution, for measuring heterogeneous the setting, its flow process operation is: A phase before this, the mode of B phase C phase is carried out then, and in order to guarantee measuring accuracy, every phase sampler averages for 6 times, shows mean value.
Effect of the present invention: owing to adopt modular hardware design, this measuring instrument is to belong to upgraded product, the power supply advanced design, and the structural design volume is little, and circuit is simple, cost is low, has certain economic benefits.
The accompanying drawing condition is bright
Fig. 1 is for constituting hardware block diagram of the present invention;
Fig. 2 (2A～2F) for constituting the physical circuit figure of hardware block diagram of the present invention;
Fig. 3 is the current signal input circuit theory diagram among Fig. 1;
Fig. 4 is the voltage input circuit theory diagram among Fig. 1;
Fig. 5 is a software flow pattern of the present invention.
Embodiment
The invention will be further described than the embodiment of Cui below in conjunction with accompanying drawing and one.As shown in Figure 1, signal input circuit 1, signal through input arrives signal processing circuit 2, signal processing circuit 2 is core devices of hardware of the present invention, data through after the signal Processing are input to display circuit 4, and communicate with telecommunication circuit 3 as required, telecommunication circuit 3 is delivered to display circuit 3 to the data after handling and is shown, and telecommunication circuit is carried out DeviceNet or MODBUS communication as required.
Described signal input circuit 1 comprises voltage signal input circuit and current signal input circuit.Here said current signal input circuit is meant what following circuit constituted, the normalized current signal input current transformer that 0～5A is arranged, arrive electronic switch through signal amplification circuit filter, three-phase switches, through reverser again to electronic switch through being rectified into 0～5V voltage, middle through the zero passage detection, judge links such as power.
Described signal input circuit 1 also comprises the voltage signal input circuit.Voltage signal input circuit described here is meant what following circuit constituted, resistor voltage divider circuit 6, electronic switching circuit 7, operational amplifier 8, positive and negative reverser 9, electronic switch 10, zero crossing detects 11, judge power circuit 12, its signal transmission is: resistor voltage divider circuit 6 is to electronic switch 10, switch to positive and negative reverser through three-phase and arrive another electronic switch 10 again, zero crossing detects 11, judge power circuit 12, its signal transmission is: resistor voltage divider circuit 6 switches to positive and negative reverser through three-phase and arrives another electronic switch 10 again to electronic switch 10, is exported by 0～5V again, resistor voltage divider circuit 6 detects power through zero crossing and judges and electronic switch 10 to electronic switch.
Described current input circuit, constitute by following circuit, current transformer 13, signal amplifier 14, electronic switch 15, positive and negative reverser 16, electronic switch 17, zero crossing detects 19, and power judges that 20 form, its signal transmission is: from current transformer 13 to signal amplifier 14, switch to positive and negative reverser 16 to electronic switch 17 rectifications 0～5V outputs through electronic switch 15.Signal amplifier 14 detects 18 through electronic switch 15 to zero crossing, arrives power judgement 19 and switches electronic switch 17.
Shown in Fig. 2 (Fig. 2 A～Fig. 2 F), described signal processing circuit 2 is core devices of the present invention, is undertaking parameters such as electric current that gather to measure electrical network, voltage, power, transmits measurement data by data bus to host computer, also has fault diagnosis functions.For this reason, adopt 16 single-chip microprocessor MCU of band A/D converter, the chip that the present invention selects for use is HD64F3664.
Here to illustrate to be that voltage, the magnitude of current in the distribution system are AC sine wave, can obtain sinusoidal effective value by measurement the measurement of sort signal.Certainly electrical network also can bring the sine wave of distortion.In order to adapt to this reality, measuring instrument must take effective value to measure.
Described power circuit is a Switching Power Supply 5, uses the TOP223 chip, and according to the measuring instrument needs, its transformer has 4 tunnel outputs, 1 tunnel input.This Switching Power Supply is transformed to 220V ± and 9V and two+5V have 4 groups of power supplys, is used for MCU microprocessor and charactron, and another group+5V is the general-purpose interface power supply.
Described display circuit has string commentaries on classics and chip 74HC595 and 74HC373 to carry out data latching, and the PNP pipe drives charactron and shows composition, and string changes and chip combines with latch.
When showing by charactron, charactron uses the PNP pipe to drive by dynamic refresh.Charactron adopts anode altogether, adjusts output voltage to change brightness by LM317.Because charactron is more, if just by state refresh, brightness is obviously not enough, shown in dynamic refresh only select 4 charactrons, use 3 373 latchs again.In order to save a mouthful line, when carrying out the input of digital data, change and the data input by string.
As shown in Figure 5, this is a software flow pattern of the present invention.Needs according to hardware plan combine with software, could the satisfactory control measurement of finishing electric weight.
Software program comprises that three-phase switches and whenever measure mutually that the step that described three-phase switches is: to be external interrupt (A phase zero crossing) to second go on foot the first step judges whether to carry out A and measure mutually, if enter the 3rd pacing amount timer and begin; When entering every phase process of measurement, the steps include: the first step is that the A/D timer interrupts measuring whether finish (judging according to 100 points of one-shot measurement) mutually to second step one, if just enter the 3rd step switching phase (waited for 1/3 cycle measured another phase again, wait operational amplifier to stablize).In order to guarantee its measuring accuracy, every phase sampler six times is calculated mean value.
In sum, characteristics of the present invention are to use advanced microprocessor MCU, use 16 single-chip microcomputers of band A/D converter, guarantee function and the precision and the later expansion of monitor; Adopting current transformer is important step of the present invention, makes measuring instrument reach higher precision; The present invention inserts the DeviceNet network need develop corresponding stipulations chip and interface circuit.Consider the upgrading requirement simultaneously, electric weight monitor of the present invention adopts modular design, shows the good of this product.Bright important step makes measuring instrument reach higher precision; The present invention inserts the DeviceNet network need develop corresponding stipulations chip and interface circuit.Consider the upgrading requirement simultaneously, electric weight monitor of the present invention adopts modular design, shows the good of this product.
Claims (9)
1, a kind of electric weight monitor with communication interface, comprise signal input circuit 1, signal processing circuit 2, telecommunication circuit 3, display circuit 4 and power circuit 5, it is characterized in that: described signal input circuit 1 also comprises voltage signal input and two kinds of circuit of current signal input;
Described signal processing circuit, its core are a kind of microprocessor MCU, electric network data is detected, and detect by data bus, and transmit to host computer by data bus;
Described display circuit is that a kind of the string changeed and circuit that chip combines with latch;
Signal transmission of aforementioned is: signal input circuit is to signal processing circuit, and after quick computing, data are sent to display circuit, and communicate with telecommunication circuit as required;
The operation of foregoing circuit also needs to combine with software, and the flow process of its software comprises that the switching of three phase sequences measures operation mutually with each.
2, electric weight monitor as claimed in claim 1 is characterized in that:
Voltage input circuit in the described signal input circuit, comprise resistor voltage divider circuit 6, electronic switching circuit 7, operational amplifier 8, positive and negative reverser 9, electronic switch 10, zero crossing detects 11, judge power circuit 12, its signal transmission is: resistor voltage divider circuit switches to positive and negative reverser to electronic switch through three-phase and arrive electronic switch again and export to 0～5V, and zero passage detection is to the power judgement or switch to electronic switch if desired.
3, electric weight monitor as claimed in claim 1 is characterized in that:
Current input circuit in the described signal input circuit comprises current transformer 13, signal amplifier 14, electronic switch 15, positive and negative reverser 16, electronic switch 17, zero crossing detection 18, power decision circuitry 19; Its signal transmission is, switches to positive and negative reverser mutually to electronic switch rectification 0～5V output through electronic switch from the current transformer to the signal amplifier, and if desired, zero crossing detects the power decision circuitry or switches to electronic switch.
4, electric weight monitor as claimed in claim 1 is characterized in that:
Described signal processing circuit is a core circuit of the present invention, adopts 16 single-chip microcomputers of band A/D converter, the HD64F3664 that selects for use.
5, electric weight monitor as claimed in claim 1 is characterized in that:
Described display circuit comprises three groups of charactrons, and every group of charactron is 4 decimal numbers, monitors the balance of three-phase.
6, electric weight monitor as claimed in claim 1 is characterized in that:
Described power circuit is a Switching Power Supply, uses the TOP223 chip, and according to the measuring instrument needs, its transformer has 4 tunnel outputs.
7, as claim 1 or 5 described electric weight monitors, it is characterized in that:
Described display circuit changes parallel port chip 74HC595 by serial ports and transmits data, and 74HC373 latch data, PNP pipe drive charactron and show that string changes and chip combines with latch.
8, as claim 1 or 2 or 3 described electric weight monitors, it is characterized in that:
Rectification circuit in described voltage, the current input circuit comprises electronic switch and commutation circuit;
Foregoing circuit was used for zero balancing, switched electronic switch and rated output symbol.
9, electric weight monitor as claimed in claim 1 is characterized in that:
Described software program comprises that three-phase switches and every flow process of measuring mutually;
The step that described three-phase switches: the first step is that external interrupt (A phase zero crossing) judges whether to carry out A to second step and measures mutually, if enter the 3rd pacing amount timer and begin; When entering every phase process of measurement, the steps include: the first step is that the A/D timer interrupts measuring whether finish (judging according to 100 points of one-shot measurement) mutually to second step one, if, just entering the 3rd step switching phase (waited for 1/3 cycle measured an other phase again, stable Deng operational amplifier), in order to guarantee its precision, every phase sampler six times is calculated mean value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017894 CN1690719A (en) | 2004-04-23 | 2004-04-23 | Electric quantity monitor with communication interfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017894 CN1690719A (en) | 2004-04-23 | 2004-04-23 | Electric quantity monitor with communication interfaces |
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| Publication Number | Publication Date |
|---|---|
| CN1690719A true CN1690719A (en) | 2005-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410017894 Pending CN1690719A (en) | 2004-04-23 | 2004-04-23 | Electric quantity monitor with communication interfaces |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412714A (en) * | 2010-09-20 | 2012-04-11 | 上海华建电力设备股份有限公司 | Motor protector power supply module |
| CN102759656A (en) * | 2012-07-18 | 2012-10-31 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN109782040A (en) * | 2018-12-06 | 2019-05-21 | 安徽凯川电力保护设备有限公司 | A kind of Current Voltage electric energy mixing instrument |
-
2004
- 2004-04-23 CN CN 200410017894 patent/CN1690719A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412714A (en) * | 2010-09-20 | 2012-04-11 | 上海华建电力设备股份有限公司 | Motor protector power supply module |
| CN102759656A (en) * | 2012-07-18 | 2012-10-31 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN102759656B (en) * | 2012-07-18 | 2014-11-05 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN109782040A (en) * | 2018-12-06 | 2019-05-21 | 安徽凯川电力保护设备有限公司 | A kind of Current Voltage electric energy mixing instrument |
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