CN101140299A - Three phase AC electric quantity capturing module - Google Patents
Three phase AC electric quantity capturing module Download PDFInfo
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- CN101140299A CN101140299A CNA2007100432823A CN200710043282A CN101140299A CN 101140299 A CN101140299 A CN 101140299A CN A2007100432823 A CNA2007100432823 A CN A2007100432823A CN 200710043282 A CN200710043282 A CN 200710043282A CN 101140299 A CN101140299 A CN 101140299A
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Abstract
A three-phase AC electric quantity collection module comprises a power source, a main CPU, an information processing unit. Wherein, the electric quantity collection module is composed of hardware and software. The power source is composed of a power source 1 and a power source 2. Circuits of two power sources are isolated. In addition, the CPU applies 32-bit ARM chip LPC2132 and is provided with a SPI and an IIC peripheral interface. The information processing unit comprises a voltage, current and frequency signal processing circuit, a digital-to-analog converting circuit and an optical coupling isolating circuit. The circuit signal as above transmits a voltage signal and a current signal and transfers sampled digital quantities into a main chip after the optical coupling isolation through signal processing and AD conversion. The main chip calculates various parameters. The module transmits data out by communicating with the main control module. The software comprises a main program flow and an interrupt program flow. The interrupt program flow comprises sampling timing interrupt, reference timing interrupt, communication interrupt and frequency collection interrupt.
Description
Technical field
The present invention relates to a kind of three-phase AC electric quantity acquisition module, be used for configurable I/O module series, belong to electric network information data acquisition technology field.
Background technology
Because module will connect various field devices in the industrial control system as the switching value of field devices such as sensor, button, pilot lamp, valve, transmitter and input, the output signal of analog quantity, and signal is sent to master controller by internal bus.Therefore just need different IO modules to realize corresponding function for different occasions.
Electric quantity acquisition module is mainly used in acquisition of various electric network parameters, comprising: the degree of unbalancedness of three-phase voltage, three-phase current, frequency, three-phase and total active power, three-phase and total reactive power, three-phase and total applied power, three-phase and total power factor, active energy, reactive energy, voltage and current, three-phase voltage each harmonic and resultant distortion rate, three-phase current each harmonic and resultant distortion rate etc.The user can monitor the electrical network situation by these parameters, so that realize function corresponding.
Electric quantity acquisition module is as a module among the IO, and for very compact on the hardware design requirement volume structure, the function of realization and product reliability be difficulty relatively.
Summary of the invention
The object of the present invention is to provide a kind of three-phase AC electric quantity acquisition module, this module can be with voltage, current signal through signal Processing and AD sampling (frequency collection need not be sampled through AD), digital quantity after the sampling is gone into master chip through light-coupled isolation is laggard, master chip calculates various parameters then, and module is again by just going out various data transmission with the main control module communication.
For achieving the above object, technical solution scheme of the present invention is: this programme is made up of hardware and software two parts, and hardware comprises power unit, master chip, information processing; Software comprises main program flow, subroutine flow process, interrupt routine.
Described power unit comprises that power supply 1 and 2, two power circuits of power supply isolate, and can avoid the forceful electric power in the signal Processing to have influence on circuit such as master chip like this, guarantees the safe and reliable of product.
Described master chip, master chip adopts 32 ARM chip LPC2132, and cost performance is higher, has Peripheral Interface commonly used such as SPI, IIC.Be kept among the eeprom by its IIC mouth for the data that need power down to keep.
Described information processing, it is a part of most critical in the whole hardware, because circuit will will be guaranteed accuracy, real-time, integrality and the reliability of signal when finishing various signals collecting, and the structure of circuit needs to design succinct ingeniously at as far as possible to reduce spatial volume.Here be divided into three parts: the signal Processing of voltage, electric current and frequency; Analog to digital conversion circuit; Optical coupling isolation circuit.
Described software comprises main program flow, subroutine flow process, interrupt routine.
Beneficial effect of the present invention: the three-phase AC electric quantity measurement module is as the input acquisition module of the ac analog in the configurable I/O, for client's selection brings convenience.Secondly, the parameter of measuring comprises degree of unbalancedness, three-phase voltage each harmonic and resultant distortion rate, three-phase current each harmonic and the resultant distortion rate etc. of three-phase voltage, three-phase current, frequency, three-phase and total active power, three-phase and total reactive power, three-phase and total applied power, three-phase and total power factor, active energy, reactive energy, voltage and current.The three-phase electricity scale parameter kind and general is compared abundanter, just can replace common voltameter in many application scenarios like this, and is user-friendly.And this module precision is higher, and basic parameter can reach 0.2%, satisfies the demand of most of occasions.
Below in conjunction with drawings and Examples the present invention is made comparisons and to explain.
Description of drawings
Fig. 1 is the schematic block circuit diagram of three-phase AC electric quantity acquisition module of the present invention;
Fig. 2 is the power principle block diagram of three-phase AC electric quantity acquisition module of the present invention;
Fig. 3 is the master chip schematic diagram of three-phase AC electric quantity acquisition module of the present invention;
Fig. 4 (Fig. 4 A, Fig. 4 B, Fig. 4 C) is the schematic diagram of the information processing part of three-phase AC electric quantity acquisition module of the present invention;
Fig. 5 is the software main program process flow diagram of three-phase AC electric quantity acquisition module of the present invention:
Fig. 6 is the software routines process flow diagram of three-phase AC electric quantity acquisition module of the present invention;
Fig. 7 (Fig. 7 A, Fig. 7 B, Fig. 7 C, Fig. 7 D) is a software-interrupt routine process flow diagram of the present invention.
Embodiment
With reference to Fig. 1, this is the schematic block circuit diagram of three-phase AC electric quantity acquisition module of the present invention.As shown in the figure, three-phase AC electric quantity acquisition module comprises power unit, master chip, information processing.Described information processing comprises voltage, current acquisition signal Processing, frequency collection signal Processing, analog to digital conversion circuit, optical coupling isolation circuit.
With reference to Fig. 2, this is the schematic diagram of the power supply of three-phase AC electric quantity acquisition module of the present invention.
As shown in the figure, power supply comprises power supply 1 and power supply 2;
U2 in the power supply 2 is that the 24V of DC/DC changes the 9V isolation module, because this power supply is powered to signal processing circuit, has forceful electric power, uses the power module of isolating can avoid influencing outside 24V.R73 is used for antisurge for the TVS pipe, and D19 is used to prevent the external power source reversal connection, and R41 is a fuse, and L1 and C37 are respectively applied for filtering and the fluctuation that both are used for reducing the input power supply is done in energy storage.9V changes 5V into by three-terminal voltage-stabilizing chip U10 again, and C31 is used for the fluctuation that energy storage is used for reducing power supply.The amplifier that 9V is mainly in the signal Processing is used, and 5V provides the digital end power supply of AD chip.
Isolate between two power circuits, can avoid the forceful electric power in the signal Processing to have influence on circuit such as master chip like this, guarantee the safe and reliable of product.
With reference to Fig. 3, this is the schematic diagram of the master chip part of three-phase AC electric quantity acquisition module of the present invention.
As shown in the figure, described master chip U7 adopts 32 ARM chip LPC2132, and cost performance is higher, has Peripheral Interface commonly used such as SPI, IIC.Be kept among the U12 by its IIC mouth for the data that need power down to keep, U12 is eeprom.U1 can reset and work more reliably for the chip that resets makes master chip.Can provide 5V power supply to module by J4 port master system device, also can communicate swap data with the master chip U7 in the module.
With reference to Fig. 4 (Fig. 4 A, Fig. 4 B, Fig. 4 C), this is the schematic diagram of the information processing part of three-phase AC electric quantity acquisition module of the present invention.
As shown in the figure, described information processing, it is a part of most critical in the whole hardware, because circuit will be when finishing various signals collecting, guarantee accuracy, real-time, integrality and the reliability of signal, and the structure of circuit needs to design succinct ingeniously at as far as possible to reduce spatial volume.Here be divided into three parts: the signal Processing of voltage, electric current and frequency; Analog to digital conversion circuit; Optical coupling isolation circuit.
Because A, B, the C phase treatment circuit of three phase network are duplicate, so only provided the treatment circuit of A phase voltage electric current here.
The three-phase alternating voltage collection is by R30, R31, R32 electric resistance partial pressure and pass through bias voltage 2.5V directly with the ac phase voltage Signal Move of importing, negative polarity with this succinct method cancellation AC signal, save the trouble of waveform upset like this, save cost, the signal Processing effect is also better, makes things convenient for analog to digital conversion.R68 is used for antisurge for the TVS pipe, and C46 is used for stablizing bias voltage 2.5V, guarantees the reliable and accurate of signal Processing.Use electric resistance partial pressure not only to save cost, the circuit volume is little, and signal can distortion, helps signals collecting.The amplifier X2D of dividing potential drop back is a high-speed high-power output amplifier, is used to constitute a voltage follower circuit, guarantees the stable of signal.Why select the high-speed high-power amplifier, the one, because need the signal that frequency analysis high speed amplifier can complete reserved high-frequency here, the 2nd, bigger to the power demand of input simulating signal during because of the conversion of AD chip, the meeting distortion if power is sampled inadequately is so amplifier needs powerful here.The output signal of voltage follow just can directly enter the AD chip like this.
The frequency collection circuit is used for survey frequency, adjusts sampling time interval at any time.The frequency collection signal Processing is by a sluggish schmidt trigger circuit process of typical band being improved, could being handled the signal that moves past in the biasing like this.Use the sluggish schmidt trigger circuit of band also can remove in the signal burr for the influence of frequency measurement.The AC signal of moving in the biasing that will import among the figure (being exactly the signal after the voltage acquisition signal Processing) changes the one-period square wave the same with AC signal into, has just known the frequency of electrical network by the frequency of monitoring square wave.
Current sampling signal is handled and is used the precision current mutual inductor to cooperate amplifier to obtain.The result of signal Processing is the same with the result of voltage signal, also is AC signal to be converted to the signal that moves in the biasing come the cancellation negative polarity, equally saves the trouble of waveform upset with voltage, saves cost, and the signal Processing effect is also better.Change current signal the signal of voltage form into so that the collection of AD chip by resistance R 48.Capacitor C 39 is used for stablizing bias voltage 2.5V, guarantees the reliable and accurate of signal Processing.Signal through amplifier output just can directly enter the AD chip.The signal Processing of amplifier X1D and top voltage is the same all to be high-speed high-power output amplifier, the one, because need the signal that frequency analysis high speed amplifier can complete reserved high-frequency here, the 2nd, bigger during because of the conversion of AD chip to the power demand of input simulating signal, the meeting distortion if power is sampled inadequately is so amplifier is again powerful here.
Whole signal Processing just becomes the receptible signal of AD chip with the multichannel forceful electric power interchange analog signal conversion of input by very succinct design, and meets initial functional requirement and performance, so circuit is efficient and volume compact.
Analog to digital conversion circuit selects for use high-precision reference source chip U6 guaranteeing the analog-to-digital accuracy of signal here, and the one, as the 5V reference source of AD chip, simultaneously also as the analog end power supply of AD chip.
Bias voltage 2.5V realizes by the voltage follower circuit that band output drives.This is to be 2.5V with reference source 5V by two equal precision resister dividing potential drops at first, obtains a stable bias voltage 2.5V by voltage follow then.In order to make bias voltage more stable, increase the driving force of exporting by the Q8 triode, increased the driving energy of input by the Q9 triode, could satisfy the power demand of other circuit like this for bias voltage.The such design of bias voltage mainly is to move processing for signal processing provides in the high performance signal biasing.
Analog to digital conversion is mainly realized by one 12 ultra high speed A chip.Each road analog signals all enters the analog port of chip, and the output of digital signal is existing by the SPI cause for gossip of chip.Accurate for bias voltage 2.5V being carried out real time calibration with what guarantee to sample, also 2.5V has been carried out analog to digital conversion here.
Optical coupling isolation circuit, owing to relate to forceful electric power in the signal Processing, so avoid influencing and destroying the circuit of master chip and back for it, the result with the AD conversion isolates by optocoupler and master chip here.The power supply that use on the optocoupler both sides is isolated.
Signal processing and master chip one have 5 road signal demands isolates.U13, U14, U15, U16 four tunnel be four signal wires of corresponding SPI mouth respectively, the SPI of four optocoupler two ends difference corresponding A D chips and the SPI of master chip.Signal after U17 handles frequency collection is isolated, and the signal interruption after the optocoupler output is carried out the collection of frequency.
With reference to Fig. 5, this is the software main program process flow diagram of electric quantity acquisition module of the present invention.
As shown in the figure, flow process is as follows: from [] 101, turn back to [data processing] 103 again to [initialization] 102, [data processing] 103, [communication process] 104, [Eeprom processing] 105.
Above main flow at first carries out the initialization of data after powering on, comprise the denotation of variable used in the various programs and reading of data from EEprom.Be exactly each programs such as data processing, communication process, EEprom processing afterwards, then return data is handled constantly circulation.Certainly the interspersed sampling timing interruption of meeting, regularly interruption of benchmark, communication disruption, frequency collection interrupt in the middle of.
With reference to Fig. 6, this is the software routines process flow diagram of electric quantity acquisition module of the present invention.
As shown in the figure, flow process is as follows: from [] 201, and to [whether having sampled an electrical network cycle] 202, if not, just [end] 205; If, to [calculating of various parameter electrical networks] 203, [software filtering] 204, [end] 205.
Data processor is according to the sampling routine one-period of whether having sampled, if sampled one-period then carry out various electrical network parameters and calculate, carries out the software filtering of data simultaneously.If also do not finish the sampling of one-period, then skip data processing and carry out following procedure.
With reference to Fig. 7, this is the software-interrupt routine process flow diagram of electric quantity acquisition module of the present invention.
Described interrupt routine flow process comprises that sampling timing interruption, regularly interruption of benchmark, communication disruption, frequency collection interrupt.
1), sampling timing interrupts, flow process is as follows: from [] 301, to [an AD sample rate current and voltage] 302, [one-period of having sampled] 303 judged if not? if not, just [end] 306; If, to [indicating the one-period of having sampled] 304, [sample-offset voltage] 305, [end] 306.
Enter and have no progeny in adopting regularly, move AD chip sample rate current and voltage successively, carry out quadratic sum then and add up and wait some data processing.Electrical network cycle if sampled then indicates the one-period of having sampled, to inform that data processor can begin to handle.Sample-offset voltage at regular intervals also simultaneously is with the precision of guaranteeing to measure.
2), benchmark regularly interrupts, flow process is as follows: from [] 401, to [each time tag adds 1] 402, [end] 403.
Benchmark regularly interrupts, and is used for adding certainly of each time tag.For example a lot of time tags of call duration time sign or the like are from adding, and are used for the time of determining to carry out corresponding function.
3), communication disruption, flow process is as follows: from [] 501, [receive interrupt still send interrupt] 502 judged? if receive, to [also will receive the data number adds 1 to the data that preservation receives] 503, [end] 504; If send, to [, sending interruption] 505, [end] 504 if send then close if do not send then send next byte.
In communication disruption, at first judge it is to receive or send to interrupt.If receive, then preserve the data that receive, the data number of Jie Shouing adds 1 simultaneously.If send whether last byte of then judging current transmission earlier, finish if then send, close to send and interrupt, if not then sending next byte, and the number that will send data adds 1.
4), frequency collection interrupts, flow process is as follows: from [] 601, judge to [whether first or last interruption] 602? if not, to [interrupt number and add 1] 603, [end] 604; If divide two kinds, if one of the mat woven of fine bamboo strips then enters [preserving the current time] 605, [end] 604; If last then enters [computing time, difference obtained cycle and frequency] 606, [calculating the time interval of upgrading fixed sampling] 607, [end] 604.
In frequency collection interrupts, several interruptions of every collection, these interrupt elapsed times according to record simultaneously, are exactly the time that deducts time of last interruption first interruption.Can obtain the cycle and the frequency of electrical network with this.Upgrade the time interval of timing sampling simultaneously according to the cycle of being tried to achieve, with the precision of guaranteeing to sample.
Claims (8)
1. three-phase AC electric quantity acquisition module, be used for configurable series of modules, to acquisition of various electric network parameters and processing, comprise power supply, host CPU, it is characterized in that: described three-phase AC electric quantity acquisition module also has the information processing part, and described information processing comprises signal processing circuit, analog to digital conversion circuit, the optical coupling isolation circuit of voltage, electric current and frequency;
The foregoing circuit signal transmits: voltage signal, current signal are by signal Processing and AD analog to digital conversion, the digital quantity of sampling is gone into master chip through light-coupled isolation is laggard, calculate various parameters by master chip, module is again by just going out data transmission with the main control module communication.
2. three-phase AC electric quantity acquisition module as claimed in claim 1 is characterized in that: described power supply comprises power supply 1 and power supply 2; Power supply 1 adopts three-terminal voltage-stabilizing chip U9, the 5V that master controller provided is become 3.3V be used for chip power supply, and two electric capacity of C35 and C36 are used for the fluctuation that energy storage is used for reducing power supply; U2 in the power supply 2 is that the 24V of DC/DC changes the 9V isolation module, R73 is used for antisurge for the TVS pipe, D19 is used to prevent the external power source reversal connection, R41 is a fuse, L1 and C37 are respectively applied for filtering and the fluctuation that both are used for reducing the input power supply is done in energy storage, 9V changes 5V into by three-terminal voltage-stabilizing chip U10 again, and C31 is used for the fluctuation that energy storage is used for reducing power supply, isolates between two power circuits.
3. a kind of electric quantity acquisition module as claimed in claim 1, it is characterized in that: described information processing, the A of three phase network, B, C phase treatment circuit, the treatment circuit of A phase voltage electric current wherein, voltage acquisition is by R30, R31, R32 electric resistance partial pressure and pass through bias voltage 2.5V directly with the ac phase voltage Signal Move of importing, R68 is used for antisurge for the TVS pipe, C46 is used for stablizing bias voltage 2.5V, the amplifier X2D of dividing potential drop back is a high-speed high-power output amplifier, is used to constitute a voltage follower circuit.
4. a kind of electric quantity acquisition module as claimed in claim 1, it is characterized in that: described information processing frequency collection circuit, be used for survey frequency, the AC signal of moving in the biasing with input changes the one-period square wave the same with AC signal into, has just known the frequency of electrical network by the frequency of monitoring square wave.
5. a kind of electric quantity acquisition module as claimed in claim 1, it is characterized in that: described information processing, here select for use high-precision reference source chip U6 guaranteeing the analog-to-digital accuracy of signal, the one, as the 5V reference source of AD chip, simultaneously also as the analog end power supply of AD chip; Bias voltage 2.5V realizes that by the voltage follower circuit that band output drives this is to be 2.5V with reference source 5V by two equal precision resister dividing potential drops at first, obtains a stable bias voltage 2.5V by voltage follow then;
Analog to digital conversion is mainly realized by one 12 ultra high speed A chip.Each road analog signals all enters the analog port of chip, and the output of digital signal is existing by the SPI cause for gossip of chip.Accurate for bias voltage 2.5V being carried out real time calibration with what guarantee to sample, also 2.5V has been carried out analog to digital conversion here; Enter master chip foreign frequency Acquisition Circuit, be used for survey frequency, the AC signal of moving in the biasing with input changes the one-period square wave the same with AC signal into, has just known the frequency of electrical network by the frequency of monitoring square wave.
6. the software main program flow process of a kind of electric quantity acquisition module as claimed in claim 1, it is characterized in that: described master routine, its flow process is as follows: from [] 101, turn back to [data processing] 103 again to [initialization] 102, [data processing] 103, [communication process] 104, [Eeprom processing] 105.
7. the software routines flow process of a kind of electric quantity acquisition module as claimed in claim 1 is characterized in that: described subroutine, and its flow process is as follows: from [] 201, to [whether having sampled an electrical network cycle] 202, if not, just [end] 205; If, to [calculating of various parameter electrical networks] 203, [software filtering] 204, [end] 205.
8. the software-interrupt routine flow process of a kind of electric quantity acquisition module as claimed in claim 1 is characterized in that: described interrupt routine flow process comprises that sampling timing interruption, regularly interruption of benchmark, communication disruption, frequency collection interrupt;
Is described sampling timing interrupted, and its flow process is as follows: from [] 301, to [an AD sample rate current and voltage] 302, [one-period of having sampled] 303 judged if not? if not, just [end] 306; If, to [indicating the one-period of having sampled] 304, [sample-offset voltage] 305, [end] 306.
Described benchmark regularly interrupts, and its flow process is as follows: from [] 401, to [each time tag adds 1] 402, [end] 403.
Described communication disruption, its flow process is as follows: from [] 501, do [receive and interrupt still sending interrupting] 502 judged? if receive, to [also will receive the data number adds 1 to the data that preservation receives] 503, [end] 504; If send, to [, sending interruption] 505, [end] 504 if send then close if do not send then send next byte.
Does described frequency collection interrupt, and flow process is as follows: from [] 601, judge to [whether first or last interruption] 602? if not, to [interrupt number and add 1] 603, [end] 604; If divide two kinds, if first then enters [preserving the current time] 605, [end] 604; If last then enters [computing time, difference obtained cycle and frequency] 606, [calculating the time interval of upgrading fixed sampling] 607, [end] 604.
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| CNA2007100432823A CN101140299A (en) | 2007-11-16 | 2007-11-16 | Three phase AC electric quantity capturing module |
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| CNA2007100432823A CN101140299A (en) | 2007-11-16 | 2007-11-16 | Three phase AC electric quantity capturing module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799671A (en) * | 2010-03-17 | 2010-08-11 | 德阳瑞能电力科技有限公司 | Regulation and control device of industrial turbine |
| CN101968506A (en) * | 2010-09-13 | 2011-02-09 | 深圳市华力特电气股份有限公司 | Alternating current sampling processing method and device |
| CN106099890A (en) * | 2016-06-22 | 2016-11-09 | 成都市晶林科技有限公司 | The supply module corrected for blind element |
| CN106707012A (en) * | 2017-01-19 | 2017-05-24 | 深圳市泛海三江电子股份有限公司 | AC signal acquisition circuit |
| CN108920478A (en) * | 2018-04-16 | 2018-11-30 | 宁波三星医疗电气股份有限公司 | Batch data segmented acquisition approach based on mini system |
| CN109921828A (en) * | 2019-01-11 | 2019-06-21 | 西安电子科技大学 | One kind being based on narrowband low-voltage powerline carrier communication cruising inspection system and method |
| CN113258532A (en) * | 2021-06-22 | 2021-08-13 | 艾德克斯电子（南京）有限公司 | Overvoltage protection method and device |
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2007
- 2007-11-16 CN CNA2007100432823A patent/CN101140299A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799671A (en) * | 2010-03-17 | 2010-08-11 | 德阳瑞能电力科技有限公司 | Regulation and control device of industrial turbine |
| CN101968506A (en) * | 2010-09-13 | 2011-02-09 | 深圳市华力特电气股份有限公司 | Alternating current sampling processing method and device |
| CN101968506B (en) * | 2010-09-13 | 2012-11-21 | 深圳市华力特电气股份有限公司 | Alternating current sampling processing method and device |
| CN106099890A (en) * | 2016-06-22 | 2016-11-09 | 成都市晶林科技有限公司 | The supply module corrected for blind element |
| CN106707012A (en) * | 2017-01-19 | 2017-05-24 | 深圳市泛海三江电子股份有限公司 | AC signal acquisition circuit |
| CN108920478A (en) * | 2018-04-16 | 2018-11-30 | 宁波三星医疗电气股份有限公司 | Batch data segmented acquisition approach based on mini system |
| CN108920478B (en) * | 2018-04-16 | 2022-01-28 | 宁波三星医疗电气股份有限公司 | Batch data segmented acquisition method based on small system |
| CN109921828A (en) * | 2019-01-11 | 2019-06-21 | 西安电子科技大学 | One kind being based on narrowband low-voltage powerline carrier communication cruising inspection system and method |
| CN113258532A (en) * | 2021-06-22 | 2021-08-13 | 艾德克斯电子（南京）有限公司 | Overvoltage protection method and device |
| CN113258532B (en) * | 2021-06-22 | 2021-09-28 | 艾德克斯电子（南京）有限公司 | Overvoltage protection method and device |
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