CN105738725A - Multipath alternating current split-phase synchronous sampling method and circuit - Google Patents
Multipath alternating current split-phase synchronous sampling method and circuit Download PDFInfo
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- CN105738725A CN105738725A CN201610069378.6A CN201610069378A CN105738725A CN 105738725 A CN105738725 A CN 105738725A CN 201610069378 A CN201610069378 A CN 201610069378A CN 105738725 A CN105738725 A CN 105738725A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
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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 multipath alternating current split-phase synchronous sampling method and circuit. An A-phase alternating current quantity channel is gated by multipath analog switches and AD conversion is controlled to be started; after completion of conversion, a B-phase alternating current quantity channel is gated, and an A-phase conversion result is read to the internal RAM of an MCU processor; after time of T/(N*3), AD conversion is started, a C-phase phase alternating current quantity channel is gated after completion of conversion, and a B-phase conversion result is read to the internal RAM of the MCU processor; after time of T/(N*3), AD conversion is started, the A-phase alternating current quantity channel is gated after completion of conversion, and a C-phase conversion result is read to the internal RAM of the MCU processor so that sampling of one point is completed by three-phase alternating current quantity; and after time of T/(N*3), the steps are repeated to perform N sampling and then cyclic sampling of three-phase alternating current signals is completed. 2/3 of the A/D conversion channel is saved, utilization rate of the A/D conversion channel is enhanced, hardware resources are saved and hardware cost is reduced.
Description
Technical field
The present invention relates to power system Sampling techniques field, particularly relate to the multichannel AC point synchronised method of sampling and circuit.
Background technology
In power system, same measurement apparatus needs to gather a large amount of ac electric, and in order to keep the synchronicity of each sampled point, it is necessary to different sampled points are started sampling simultaneously, and the synchronicity therefore keeping sampling is particularly important.
In order to ensure the synchronicity of sampling, now more common scheme is the AD conversion chip adopting and having high accuracy, high-speed synchronous sampling functions.When needs gather multichannel AC signal, it is necessary to AD number of channels is relatively more, relatively costly.The asynchronous sampling of same of ac will produce phase contrast, causes of ac collection to produce deviation, it is necessary to takes the compensation method of complexity to compensate calibration.
Summary of the invention
The purpose of the present invention is contemplated to solve the problems referred to above, it is provided that a kind of multichannel AC divides the synchronised method of sampling and circuit, when gathering multichannel AC amount, saves the A/D ALT-CH alternate channel of 2/3, reduces hardware cost.Achieve point synchronised sampling of multichannel AC amount, it is ensured that telemetry precision.
To achieve these goals, the present invention adopts the following technical scheme that
Multichannel AC divides the synchronised method of sampling, in a cycle T of AC signal, takes N point equal interval sampling mode, including:
Step one, multiway analog switch gating A intersects traffic channel, controls AD conversion and starts；Waiting EOC, switching multiway analog switch gating B intersects traffic channel, reads A phase transformation result in MCU processor internal RAM；
Step 2, through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating C intersects traffic channel, reads B phase transformation result in MCU processor internal RAM；
Step 3, again through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating A intersects traffic channel, reads C phase transformation result in 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 completes the sampling of three-phase ac signal one cycle after carrying out N number of sampling to step 3.
Sampling number N and sampling period T converts by adopted AC signal is carried out frequency-tracking.
N point equal interval sampling utilizes Fourier transform after completing, and calculates virtual value, power and phase parameter.
Startup by FSMC bus marco AD conversion.
Adopt the circuit of the described multichannel AC point synchronised method of sampling, including multiple multiway analog switches, one multiway analog switch of access that A, B, C three-phase of ac analog is corresponding respectively, each multiway analog switch accesses an input channel of high-speed synchronous oversampling A/D-converter, the output termination MCU processor of described high-speed synchronous oversampling A/D-converter.
Described MCU processor adopts FSMC EBI control AD conversion and read transformation result, and MCU processor controls each multiway analog switch synchronism switching, it is ensured that each crossing flow synchronized sampling.
Beneficial effects of the present invention:
1, save the A/D ALT-CH alternate channel of 2/3, improve AD conversion channel utilization index, while a large amount of of acs of solution are accurately sampled, save hardware resource, reduce hardware cost.
2, A, B, C three-phase alternating current amount phase synchronization is accurately sampled, it is possible to accurately obtain all single-phase voltages, electric current, the signal such as meritorious, idle.Between A, B, C three-phase, the sampling interval is fixed, and there is only small fixed skew, it is simple to compensation calculation between three-phase.
3, after each AD conversion terminates, first switching analoging switch passage, then carry out digital independent and process, it is possible to making AD sampling avoid the spike interference that analog switch passage brings, sampled signal is more stable, improves data precision.
4, AD conversion is controlled by MCU by parallel interface FSMC, it is possible to reach the highest data transmission bauds；
Accompanying drawing explanation
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 chart of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described with embodiment.
As shown in Figure 1, multichannel AC divides synchronised sample circuit, including multiple multiway analog switches, one multiway analog switch of access that A, B, C three-phase of ac analog is corresponding respectively, each multiway analog switch accesses an input channel of high-speed synchronous oversampling A/D-converter, the output termination MCU processor of described high-speed synchronous oversampling A/D-converter.MCU processor adopts FSMC EBI control AD conversion and read transformation result, and MCU processor controls each multiway analog switch synchronism switching, it is ensured that each crossing flow synchronized sampling.
Fig. 2 is a kind of circuit implementing method of this programme, adopts multiway analog switch ADG659 that A, B, C three-phase is switched over, is sequentially sent to AD7606 and changes.That AD conversion chip adopts is the AD7606 with 16 bipolarity 8 Channel Synchronous sampling functions, is especially suitable for and a large amount of ployphase voltages current synchronization are sampled.Adopt FSMC parallel bus AD7606 is carried out digital independent and, the start and stop of conversion.
Adopt the method for sampling of described multichannel AC point synchronised sample circuit, in a cycle T of AC signal, take N point equal interval sampling mode, including:
Step one, multiway analog switch gating A intersects traffic channel, is started by FSMC bus marco AD conversion；Waiting EOC, switching multiway analog switch gating B intersects traffic channel, reads A phase transformation result in MCU processor internal RAM；
Step 2, through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating C intersects traffic channel, reads B phase transformation result in MCU processor internal RAM；
Step 3, again through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating A intersects traffic channel, reads C phase transformation result in 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 completes the sampling of three-phase ac signal one cycle after carrying out N number of sampling to step 3.
Sampling number N is integer, and value is more big, and sample waveform is more desirable, but amount of calculation is also more big, poor real.Power system considers Harmonics Calculation, and N generally takes 32 or 64.
System adopts multiway analog switch synchronism switching A, B, C three-phase alternating current analog quantity successively, it is ensured that point synchronised sampling of multichannel AC amount, and saves the A/D ALT-CH alternate channel of 2/3, reduces hardware cost.The accuracy of the calculating of single-phase voltage, electric current, power will not be affected because of phase error.
Within a cycle of AC signal, take N point equal interval sampling mode, then utilize Fourier transform, calculate the parameters such as virtual value, power, phase place.Owing to taking three-phase synchronous switch sampling, N point sampling point-to-point transmission every between three-phase alternating current channel signal is switched at equal intervals.
Fig. 3 show the method gathering monophasic pulses, in order to ensure passage switching after stabilization of level, after converting every time, multiway analog switch is switched to next passage to be sampled, then the reading process of data is carried out, to ensure to have enough level to set up the time, it is to avoid due to switch disturbance that prime signal conditioning circuit causes after switching.For N point equal interval sampling in the cycle T time, switching interval is T/ (N*3), and wherein sampling period T can pass through adopted AC signal is carried out frequency-tracking to convert.
The specific embodiment of the present invention is described in conjunction with accompanying drawing although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (6)
1. multichannel AC divides the synchronised method of sampling, it is characterized in that, in a cycle T of AC signal, takes N point equal interval sampling mode, including:
Step one, multiway analog switch gating A intersects traffic channel, controls AD conversion and starts；Waiting EOC, switching multiway analog switch gating B intersects traffic channel, reads A phase transformation result in MCU processor internal RAM；
Step 2, through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating C intersects traffic channel, reads B phase transformation result in MCU processor internal RAM；
Step 3, again through T/ (N*3) after the time, AD conversion starts, and waits EOC, and switching multiway analog switch gating A intersects traffic channel, reads C phase transformation result in 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 completes the sampling of three-phase ac signal one cycle after carrying out N number of sampling to step 3.
2. multichannel AC divides the synchronised method of sampling as claimed in claim 1, it is characterized in that, sampling number N and sampling period T converts by adopted AC signal is carried out frequency-tracking.
3. multichannel AC divides the synchronised method of sampling as claimed in claim 1, it is characterized in that, N point equal interval sampling utilizes Fourier transform after completing, and calculates virtual value, power and phase parameter.
4. multichannel AC divides the synchronised method of sampling as claimed in claim 1, it is characterized in that, by the startup of FSMC bus marco AD conversion.
5. adopt multichannel AC described in claim 1 to divide the circuit of the synchronised method of sampling, it is characterized in that, including multiple multiway analog switches, one multiway analog switch of access that A, B, C three-phase of ac analog is corresponding respectively, each multiway analog switch accesses an input channel of high-speed synchronous oversampling A/D-converter, the output termination MCU processor of described high-speed synchronous oversampling A/D-converter.
6. multichannel AC divides synchronised sample circuit as claimed in claim 5, it is characterized in that, described MCU processor adopts FSMC EBI control AD conversion and read transformation result, and MCU processor controls each multiway analog switch synchronism switching, it is ensured that each crossing flow 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 |
| 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 |
| CN108008178A (en) * | 2017-11-28 | 2018-05-08 | 指明集团有限公司 | Wireless multifunctional power network signal Transmission system |
| CN111123774A (en) * | 2019-12-19 | 2020-05-08 | 上海宇航***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 |