CN202870215U - AC collection apparatus - Google Patents
AC collection apparatus Download PDFInfo
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- CN202870215U CN202870215U CN 201220562270 CN201220562270U CN202870215U CN 202870215 U CN202870215 U CN 202870215U CN 201220562270 CN201220562270 CN 201220562270 CN 201220562270 U CN201220562270 U CN 201220562270U CN 202870215 U CN202870215 U CN 202870215U
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- voltage
- dsp processor
- chip microcomputer
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- interchange
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Abstract
The utility model discloses an AC collection apparatus, comprising a DSP processor and a single-chip microcomputer connected with the DSP processor, wherein the AC voltages of A, B and C phases are divided by precise resistors, then boosted from a 1.65V reference voltage to a DC voltage signal with an effective value from 0.7V to 1V, then processed to be a voltage value from 0V to 3.3V through an operation amplifier, and output to the A/D conversion input port of the DSP processor; the AC currents of A, B and C phases pass through current transformers, then boosted from the 1.65V reference voltage to a small DC voltage signal with an effective value from 0.7V to 1V, then processed to be a voltage from 0V to 3.3V, and output to the A/D conversion input port of the DSP processor; and simultaneously the small DC voltage signal with the effective value from 0.7V to 1V, converted from the A or C phase AC voltage is input into a hysteresis comparator and output to the CAP port of the DSP processor. The AC collection apparatus can satisfy the precision demands of the system.
Description
Technical field
The utility model relates to the electric power data acquisition field, relates in particular to a kind of interchange harvester.
Background technology
In some industrial and mining enterprises, often need the monitoring parameters of electric power, in order to guarantee the quality of power supply, thereby guarantee product quality.At present, exchanging harvester mainly adopts 8 single-chip microcomputers or 16 s' DSP to design.Yet the single-chip data processing power is not enough, is difficult to obtain comprehensive parameters of electric power data; And in the existing system based on DSP, if signal-DSP system is selected expensive TMS320F28 family chip, then cost is higher; If select general TMS320F24 family chip, because speed is lower, function limitation; And adopt in TMS320F24 family chip and the system that 8 single-chip microcomputers are combined, all with single-chip microcomputer collection momentary current and voltage signal, only adopt dsp chip to finish the calculation of parameter task.And the acquisition precision of 8 single-chip microcomputers is not enough, just is difficult to guarantee the computational accuracy of alternating-current parameter.
The utility model content
The technical problems to be solved in the utility model is: a kind of interchange harvester is provided, in order to finish the Real-time Collection of alternating-current parameter, calculate in real time and show in real time, and satisfies the accuracy requirement of system.
To achieve these goals, the technical solution adopted in the utility model is: a kind of interchange harvester comprises voltage sample module, current sample module, frequency sampling module, dsp processor, single-chip microcomputer and display module; The voltage sample module is carried out voltage division processing by precision resistance to A phase, B phase and C alternating voltage mutually, is promoted to the voltage direct current signal by reference voltage again, and by after the amplifier processing, exports respectively the A/D conversion input port of dsp processor to; The current sample module, A phase, B phase and C alternating current mutually are converted to the voltage direct current signal by current transformer and reference voltage respectively, and by after the amplifier processing, export the A/D conversion input port of dsp processor to; The frequency sampling module with A phase or the C cross streams voltage voltage direct current signal by precision resistance and reference voltage conversion, is sent into hysteresis loop comparator, exports the CAP input port of dsp processor to again; Dsp processor is connected with single-chip microcomputer, and the single-chip microcomputer output terminal connects display module.
As preferably, described single-chip microcomputer adopts AT89S51.
As preferably, described dsp processor is TMS320F2407, and dsp processor and single-chip microcomputer pass through serial-port communication.
As preferably, described display module comprises charactron and button, and charactron is connected with single-chip microcomputer through the MAX7219 chip, and button is connected with the single-chip processor i/o mouth.
As preferably, described charactron is 8, and button is 2.
As preferably, described single-chip microcomputer is by 3 I/O mouths control MAX485 chips, thereby is mounted on 485 buses; Host computer turns 485 modules by 232 and is connected on 485 buses.
The beneficial effect that the utility model brings is: the utility model adopts the method for designing based on TMS320LF2407 and 8 single chip computer AT 89S51, take TMS32LF2407 as core, finishes collection and the calculating of AC signal; And only finish the demonstration of alternating-current parameter with single-chip microcomputer, thereby in the situation that guarantees the parameter acquisition precision, finish the Real-time Collection of alternating-current parameter, calculate in real time and show in real time.
Description of drawings
Fig. 1 is the circuit diagram of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Embodiment one
As shown in Figure 1, a kind of interchange harvester mainly comprises following part:
First: DSP microcontroller TMS320LF2407 gathers the C phase voltage frequency of alternating current:
Carry out dividing potential drop sampling by resistance R 29 (330K Ω) and R30 (1K Ω), wherein R30 is that precision is 1% metalfilmresistor, thereby (effective value≤300V) step-down obtains U with the C phase voltage of external communication electricity
Vc=300/331=0.91V (with respect to reference voltage 1.65V);
Be output as through amplifier:
(with respect to reference voltage 1.65V), by the lifting of 1.65V, effective value is that the AC signal of 300V is treated to the direct current signal with respect to the 0.28～3.02V on ground.
Above-mentioned signal is sent into the anti-phase hysteresis loop comparator that N7 and R35～R37 form, and the antijamming capability of hysteresis loop comparator is very strong, can improve measuring accuracy.
Hysteresis loop comparator has two threshold values.In this circuit, output voltage changes to the threshold values of high level by low level, and output voltage is respectively by the threshold values that high level changes to high level:
The process of being calculated by the front voltage sampling circuit, Vc is 0.28～3.02V with respect to digitally magnitude of voltage as can be known, signal is the sinusoidal waveform of mean value 1.65V.And the reference voltage value of this hysteresis loop comparator normal phase input end is GNDA, i.e. 1.65V.By above calculating as can be known, two threshold values of hysteresis loop comparator depart from up and down about 0.15V centered by 1.65V, and the difference of two threshold values is 0.3V.Be disturbed when changing when input signal like this, as long as variable quantity is no more than 0.64V, it is stable that output quantity will keep, and the impact that can not be disturbed.
Above signal is input to the CAP1 end of TMS320LF2407, can calculate the frequency of signal.
Second portion: DSP microcontroller TMS320LF2407 gathers A, B and the C phase voltage of alternating current:
Carry out dividing potential drop sampling by resistance R 29 (330K Ω) and R30 (1K Ω), wherein R30 is that precision is 1% metalfilmresistor, thereby (effective value≤300V) step-down obtains U with the C phase voltage of external communication electricity
Vc=300/331=0.91V (with respect to reference voltage 1.65V);
Be output as through amplifier:
(with respect to reference voltage 1.65V), by the lifting of 1.65V, effective value is that the AC signal of 300V is treated to the direct current signal with respect to the 0.28～3.02V on ground;
Above signal enters the A/D input port ADCIN5 pin of dsp chip TMS320LF2407 behind capacitance-resistance (R34 and C6) filtering and stabilivolt (D6) amplitude limit;
The A/D of TMS320LF2407 inside is 10 one by one pattern number converters relatively, when select+during the accurate reference power supply of 3.3V, its quantization unit q is 3.22mV(3.3/1024=3.22mV), quantization error is q/2=1.61mV.In a wave period, analog-to-digital precision is 1.61 * 10 during DSP sampling minimum value 0.63 V
-3/ 0.28=0.57%, analog-to-digital precision is 1.61 * 10 during sampling maximal value 4.37V
-3/ 3.02=0.053%, in the parameter calculation formulas such as electric current, voltage effective value, every point sampling value is in equal status, but role is different.Be worth greatlyr, role is larger, and the precision of parameter is also mainly decided by large value.Therefore, can think that the precision of parameter is better than the mean value of minimum and maximum precision.Be that precision is better than 0.311%.
In like manner the A phase voltage of external communication electricity and B phase voltage connect respectively A/D input port ADCIN3 and the ADCIN4 pin of dsp chip TMS320LF2407 by similar processing.
Third part: DSP microcontroller TMS320LF2407 gathers A, B and the C phase current of alternating current:
By current transformer, with the C phase current signal (effective value≤5A) through accurate current transformer (precision is 0.1%, 5mA) and R24 (150 Ω) be converted to the small voltage signal, the size of small voltage signal effective value is: 5 * 10
-3* 150=0.75V, scope is ± 5 * 10
-3* 150 *
=± 1.06V (relative voltage benchmark 1.65V) relatively is 0.59～2.71V;
The emitter follower output that above-mentioned signal forms through amplifier;
Above-mentioned signal enters the A/D input port ADCIN2 pin of dsp chip TMS320LF2407 behind capacitance-resistance (R28 and C5) filtering and stabilivolt (D5) amplitude limit;
In a wave period, analog-to-digital precision is 0.161 * 10 during DSP sampling minimum value 0.59V
-3/ 0.59=0.274%;
Analog-to-digital precision is 0.161 * 10 during sampling maximal value 2.71V
-3/ 2.71=0.058%.The precision of the parameter of surveying should be better than 0.166%;
In like manner the A phase current of external communication electricity and B phase current connect respectively A/D input port ADCIN0 and the ADCIN1 pin of dsp chip TMS320LF2407 by similar processing.
The 4th part: the various parameter informations that DSP microcontroller TMS320LF2407 will calculate pass to the AT89S51 single-chip microcomputer.
DSP determines the sample frequency of electric current, voltage channel according to the frequency that records.For example suppose that frequency is 50Hz, then the cycle is 20ms.Per cycle of monitor gathers 64 points, and A/D channel sample frequency is 3200Hz, and the sampling period is 312.5us;
After TMS320LF2407 has gathered the one-period data, calculate all relevant parameters of electric power;
TMS320LF2407 is sent to the AT89S51 single-chip microcomputer with the mean value of institute's calculating parameter in the 1s Interruption;
After the AT89S51 single-chip microcomputer receives parameter, be stored in the storer, and by 3 I/O mouths, the SPI-bus analogue sequential drives the MAX7219 chip, thereby lights 8 charactrons, shows A phase voltage and current effective value;
The AT89S51 single-chip microcomputer has been expanded 2 buttons by 5 I/O mouths, is respectively upturning key and downturning key, and the user can select all the other parameters to show by upturning key and downturning key;
The AT89S51 single-chip microcomputer utilizes 3 I/O mouths, by the light lotus root, drives the MAX485 chip, has expanded a RS-485 interface, is mounted on 485 buses; Host computer turns 485 modules by 232, is mounted to 485 buses, can control nearly 255 interchange harvesters; Each exchanges harvester the unique address of oneself, and host computer can exchange collector to each and send the collection signal order, and this interchange harvester can be sent to host computer with parameters of electric power.
In order to guarantee the calculation of parameter precision, each cycle need to gather 64 points, and system just can calculate the cycle that dsp processor gathers three road voltage signals and three road current signals according to the frequency of the alternating current that calculates; 64 voltage signals that dsp processor TMS320F2407 collected according to each cycle and the instantaneous value of current signal, calculate the parameter such as three-phase voltage, three-phase current, frequency, active power, reactive power, applied power, power factor, active electrical degree, apparent electric degree, harmonic wave of three-phase alternating current, and be stored in the storer.
Embodiment two
That in the first, DSP microcontroller TMS320LF2407 gathers the A phase voltage frequency of alternating current, gathers identical with embodiment one with computation process with embodiment one difference; Second and third, four parts are with embodiment one.
Claims (6)
1. an interchange harvester is characterized in that: comprise voltage sample module, current sample module, frequency sampling module, dsp processor, single-chip microcomputer and display module;
The voltage sample module is carried out voltage division processing by precision resistance to A phase, B phase and C alternating voltage mutually, is promoted to the voltage direct current signal by reference voltage again, and by after the amplifier processing, exports respectively the A/D conversion input port of dsp processor to;
The current sample module, A phase, B phase and C alternating current mutually are converted to the voltage direct current signal by current transformer and reference voltage respectively, and by after the amplifier processing, export the A/D conversion input port of dsp processor to;
The frequency sampling module with A phase or the C cross streams voltage voltage direct current signal by precision resistance and reference voltage conversion, is sent into hysteresis loop comparator, exports the CAP input port of dsp processor to again;
Dsp processor is connected with single-chip microcomputer, and the single-chip microcomputer output terminal connects display module.
2. a kind of interchange harvester according to claim 1 is characterized in that: described single-chip microcomputer employing AT89S51.
3. a kind of interchange harvester according to claim 2, it is characterized in that: described dsp processor is TMS320F2407, and dsp processor and single-chip microcomputer pass through serial-port communication.
4. a kind of interchange harvester according to claim 3, it is characterized in that: described display module comprises charactron and button, and charactron is connected with single-chip microcomputer through the MAX7219 chip, and button is connected with the single-chip processor i/o mouth.
5. a kind of interchange harvester according to claim 4, it is characterized in that: described charactron is 8, button is 2.
6. a kind of interchange harvester according to claim 5 is characterized in that: described single-chip microcomputer is by 3 I/O mouths control MAX485 chips, thereby is mounted on 485 buses; Host computer turns 485 modules by 232 and is connected on 485 buses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220562270 CN202870215U (en) | 2012-10-30 | 2012-10-30 | AC collection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220562270 CN202870215U (en) | 2012-10-30 | 2012-10-30 | AC collection apparatus |
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| CN202870215U true CN202870215U (en) | 2013-04-10 |
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| CN 201220562270 Expired - Fee Related CN202870215U (en) | 2012-10-30 | 2012-10-30 | AC collection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928706A (en) * | 2012-10-30 | 2013-02-13 | 河南科技大学 | Alternating current acquisition device and data acquisition method thereof |
| CN108802485A (en) * | 2018-09-04 | 2018-11-13 | 攀枝花学院 | A kind of Digital AC ammeter module |
-
2012
- 2012-10-30 CN CN 201220562270 patent/CN202870215U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928706A (en) * | 2012-10-30 | 2013-02-13 | 河南科技大学 | Alternating current acquisition device and data acquisition method thereof |
| CN102928706B (en) * | 2012-10-30 | 2016-02-24 | 河南科技大学 | A kind of interchange harvester and collecting method thereof |
| CN108802485A (en) * | 2018-09-04 | 2018-11-13 | 攀枝花学院 | A kind of Digital AC ammeter module |
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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: 20130410 Termination date: 20141030 |
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| EXPY | Termination of patent right or utility model |