CN105738725B - Multichannel AC split-phase synchronous sampling method and circuit - Google Patents
Multichannel AC split-phase synchronous sampling method and circuit Download PDFInfo
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- CN105738725B CN105738725B CN201610069378.6A CN201610069378A CN105738725B CN 105738725 B CN105738725 B CN 105738725B CN 201610069378 A CN201610069378 A CN 201610069378A CN 105738725 B CN105738725 B CN 105738725B
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- 238000005070 sampling Methods 0.000 title claims abstract description 56
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 230000009466 transformation Effects 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a kind of multichannel AC split-phase synchronous sampling method and circuit, multiway analog switch gates A and intersects traffic channel, and control AD conversion starts；Conversion end, gating B is waited for intersect traffic channel, read in A phases transformation result to MCU processor internal RAM；By T/ (N*3) after the time, AD conversion starts, and conversion end, gating C is waited for intersect traffic channel, read in B phases transformation result to MCU processor internal RAM；By T/ (N*3) after the time, AD conversion starts, and waits for conversion end, gating A to intersect traffic channel, read in C phases transformation result to MCU processor internal RAM, three-phase alternating current amount completes 1 point sampling；By T/ (N*3) after the time, repeat to complete the sampling of one cycle of three-phase ac signal after step carries out N number of sampling.2/3 A/D ALT-CH alternate channels are saved, AD conversion channel utilization index is improved, saves hardware resource, reduce hardware cost.
Description
Technical field
The present invention relates to electric system sampling technique field more particularly to multichannel AC split-phase synchronous sampling methods and electricity
Road.
Background technology
Same measuring device needs to acquire a large amount of ac electrics in electric system, and in order to keep the synchronization of each sampled point
Property, it needs to different sampled points while starting sampling, therefore keep the synchronism of sampling particularly important.
In order to ensure that the synchronism of sampling, now more common scheme are using with high-precision, high-speed synchronous sampling
The AD conversion chip of function.When needing to acquire multichannel AC signal, need AD numbers of channels relatively more, cost is higher.It is same
The asynchronous sampling of of ac will will produce phase difference, and of ac acquisition is caused to generate deviation, need to take complicated compensation side
Method compensates calibration.
Invention content
The purpose of the present invention is exactly to solve the above-mentioned problems, to provide a kind of multichannel AC split-phase synchronous sampling method and electricity
Road saves 2/3 A/D ALT-CH alternate channels, reduces hardware cost when acquiring multichannel AC amount.Realize multichannel AC amount
Split-phase synchronized sampling ensure that telemetry precision.
To achieve the goals above, the present invention adopts the following technical scheme that：
Multichannel AC split-phase synchronous sampling method takes N points equal interval sampling side in a cycle T of AC signal
Formula, including：
Step 1, multiway analog switch gate A and intersect traffic channel, and control AD conversion starts；Wait for conversion end, switching
Multiway analog switch gates B and intersects traffic channel, reads in A phases transformation result to MCU processor internal RAM；
Step 2, by T/ (N*3) after the time, AD conversion starts, and waits for conversion end, switching multiway analog switch gating
C intersects traffic channel, reads in B phases transformation result to MCU processor internal RAM；
Step 3, but by T/ (N*3) after the time, AD conversion starts, and waits for conversion end, switching multiway analog switch choosing
Logical A intersects traffic channel, reads in C phases transformation result to MCU processor internal RAM, and three-phase alternating current amount completes 1 point sampling；
Step 4 again passes by T/ (N*3) after the time, and repeating said steps one to step 3 are completed after carrying out N number of sampling
One cycle of three-phase ac signal samples.
Sampling number N and sampling period T is converted by carrying out frequency-tracking to adopted AC signal.
Fourier transform is utilized after the completion of N points equal interval sampling, calculates virtual value, power and phase parameter.
Pass through the startup of FSMC bus marco AD conversion.
Using the circuit of the multichannel AC split-phase synchronous sampling method, including multiple multiway analog switches, of ac
A, one multiway analog switch of the corresponding access of B, C three-phase, each multiway analog switch access high-speed synchronous sampling AD turn
The output of one input channel of parallel operation, the high-speed synchronous oversampling A/D-converter terminates MCU processor.
The MCU processor is using FSMC bus interface control AD conversion and reads transformation result, and MCU processor control is each
Multiway analog switch synchronism switching ensures each phase of ac synchronized sampling.
Beneficial effects of the present invention：
1,2/3 A/D ALT-CH alternate channels are saved, AD conversion channel utilization index is improved, are accurately adopted solving a large amount of of acs
While sample, hardware resource is saved, reduces hardware cost.
2, A, B, C three-phase alternating current amount phase synchronization accurately sample, can accurately obtain all single-phase voltages, electric current, it is active,
Idle equal signals.A, the sampling interval is fixed between B, C three-phase, and there are the fixed skews of very little between three-phase, convenient for compensation meter
It calculates.
3, after each AD conversion, first switching analoging switch channel, then digital independent and processing are carried out, AD can be made to adopt
Sample avoids the spike brought in analog switch channel interference, and sampled signal is more stablized, and data precision is improved.
4, MCU controls AD conversion by parallel interface FSMC, can reach highest data transmission bauds；
Description of the drawings
Fig. 1 is the System control structures figure of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention；
Fig. 3 is the AD sampling flow charts of the embodiment of the present invention.
Specific implementation mode
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, multichannel AC split-phase synchronized sampling circuit, including multiple multiway analog switches, A, B, C of of ac
Three-phase one multiway analog switch of corresponding access, each multiway analog switch access high-speed synchronous oversampling A/D-converter
The output of one input channel, the high-speed synchronous oversampling A/D-converter terminates MCU processor.MCU processor is total using FSMC
Line interface controls AD conversion and reads transformation result, and MCU processor controls each multiway analog switch synchronism switching, ensures each intersection
Flow synchronized sampling.
Fig. 2 is a kind of circuit implementing method of this programme, is cut to A, B, C three-phase using multiway analog switch ADG659
It changes, is sequentially sent to AD7606 and is converted.AD conversion chip is using with 16 8 Channel Synchronous sampling functions of bipolarity
AD7606 is very suitable for sampling a large amount of ployphase voltages current synchronizations.Data reading is carried out to AD7606 using FSMC parallel bus
It takes and the start and stop of conversion.
It is adopted in a cycle T of AC signal using the method for sampling of the multichannel AC split-phase synchronized sampling circuit
N point equal interval sampling modes are taken, including：
Step 1, multiway analog switch gate A and intersect traffic channel, started by FSMC bus marco AD conversion；It waits for
Conversion end, switching multiway analog switch gating B intersect traffic channel, read A phases transformation result to MCU processor internal RAM
In；
Step 2, by T/ (N*3) after the time, AD conversion starts, and waits for conversion end, switching multiway analog switch gating
C intersects traffic channel, reads in B phases transformation result to MCU processor internal RAM；
Step 3, but by T/ (N*3) after the time, AD conversion starts, and waits for conversion end, switching multiway analog switch choosing
Logical A intersects traffic channel, reads in C phases transformation result to MCU processor internal RAM, and three-phase alternating current amount completes 1 point sampling；
Step 4 again passes by T/ (N*3) after the time, and repeating said steps one to step 3 are completed after carrying out N number of sampling
One cycle of three-phase ac signal samples.
Sampling number N is integer, and value is bigger, and sample waveform is more ideal, but calculation amount is also bigger, and real-time is poor.Electricity
Force system considers that Harmonics Calculation, N usually take 32 or 64.
System ensure that multichannel AC amount using multiway analog switch successively synchronism switching A, B, C three-phase alternating currents analog quantity
Split-phase synchronized sampling, and save 2/3 A/D ALT-CH alternate channels, reduce hardware cost.Will not because of phase error shadow
Ring the accuracy of the calculating of single-phase voltage, electric current, power.
In a cycle of AC signal, N point equal interval sampling modes are taken, then utilize Fourier transform, are calculated
Go out the parameters such as virtual value, power, phase.Due to taking three-phase synchronous switch sampling, N point samplings point-to-point transmission between to three
Phase communication channel signal is switched at equal intervals.
The method that Fig. 3 show acquisition monophasic pulses is turning every time in order to ensure stabilization of level after the switching of channel
After the completion of changing, multiway analog switch is switched into next channel to be sampled, then carries out the reading process of data, to ensure having foot
Enough level settling times avoid after switching due to switch disturbance caused by prime signal conditioning circuit.For the cycle T time
Interior N points equal interval sampling, switching interval be T/ (N*3), wherein sampling period T can by adopted AC signal into line frequency with
Track is converted.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (6)
1. multichannel AC split-phase synchronous sampling method, characterized in that in a cycle T of AC signal, take N points at equal intervals
Sample mode, including：
Step 1, multiway analog switch gate A and intersect traffic channel, and control AD conversion starts；Conversion end is waited for, multichannel is switched
Analog switch gates B and intersects traffic channel, reads in A phases transformation result to MCU processor internal RAM；
Step 2, by T/ (N*3) after the time, AD conversion starts, and conversion end, switching multiway analog switch is waited for gate C phases
Of ac channel is read in B phases transformation result to MCU processor internal RAM；
Step 3, but by T/ (N*3) after the time, AD conversion starts, and conversion end, switching multiway analog switch is waited for gate A
Intersect traffic channel, read in C phases transformation result to MCU processor internal RAM, three-phase alternating current amount completes 1 point sampling；
Step 4 again passes by T/ (N*3) after the time, and repeating said steps one to step 3 complete three-phase after carrying out N number of sampling
One cycle of AC signal samples.
2. multichannel AC split-phase synchronous sampling method as described in claim 1, characterized in that sampling number N and sampling period T is logical
It crosses and adopted AC signal progress frequency-tracking is converted.
3. multichannel AC split-phase synchronous sampling method as described in claim 1, characterized in that profit after the completion of N points equal interval sampling
With Fourier transform, virtual value, power and phase parameter are calculated.
4. multichannel AC split-phase synchronous sampling method as described in claim 1, characterized in that pass through FSMC bus marco AD conversion
Startup.
5. using the circuit of multichannel AC split-phase synchronous sampling method described in claim 1, characterized in that including multiple multichannel moulds
Quasi- switch, A, B, C three-phase one multiway analog switch of corresponding access of of ac, each multiway analog switch access are high
The output of one input channel of fast synchronized sampling AD converter, the high-speed synchronous oversampling A/D-converter terminates MCU processor.
6. multichannel AC split-phase synchronized sampling circuit as claimed in claim 5, characterized in that the MCU processor uses FSMC
Bus interface controls AD conversion and reads transformation result, and MCU processor controls each multiway analog switch synchronism switching, ensures each phase
Of ac synchronized sampling.
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| CN106443162A (en) * | 2016-12-14 | 2017-02-22 | 佛山市科瑞德电气科技有限公司 | Device and method for reducing power calculation errors |
| CN108008178A (en) * | 2017-11-28 | 2018-05-08 | 指明集团有限公司 | Wireless multifunctional power network signal Transmission system |
| CN108010295A (en) * | 2017-11-28 | 2018-05-08 | 指明集团有限公司 | Power network signal wireless transmitting system based on collection type current transformer |
| CN111123774B (en) * | 2019-12-19 | 2021-09-07 | 上海宇航系统工程研究所 | Motor current acquisition method and system applied to deep space detection antenna servo controller |
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Address after: 250101 block B, Yinhe building, 2008 Xinjie street, hi tech Zone, Ji'nan, Shandong. Applicant after: Shandong Luneng Intelligent Technology Co., Ltd. Address before: 250101 B block 626, Yinhe building, 2008 Xinjie street, Ji'nan high tech Zone, Shandong. Applicant before: Shandong Luneng Intelligent Technology Co., Ltd. |
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Address after: 250101 Electric Power Intelligent Robot Production Project 101 in Jinan City, Shandong Province, South of Feiyue Avenue and East of No. 26 Road (ICT Industrial Park) Patentee after: National Network Intelligent Technology Co., Ltd. Address before: 250101 block B, Yinhe building, 2008 Xinjie street, hi tech Zone, Ji'nan, Shandong. Patentee before: Shandong Luneng Intelligent Technology Co., Ltd. |
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Effective date of registration: 20201214 Address after: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province Patentee after: Shandong Luneng Software Technology Co.,Ltd. intelligent electrical branch Address before: 250101 power intelligent robot production project 101 south of Feiyue Avenue and east of No.26 Road (in ICT Industrial Park) in Suncun District of Gaoxin, Jinan City, Shandong Province Patentee before: National Network Intelligent Technology Co.,Ltd. |
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Address after: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province Patentee after: Shandong luruan Digital Technology Co.,Ltd. smart energy branch Address before: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province Patentee before: Shandong Luneng Software Technology Co.,Ltd. intelligent electrical branch |