CN107422156A - A kind of dynamic distortion power source based on high speed DMA fitting - Google Patents
A kind of dynamic distortion power source based on high speed DMA fitting Download PDFInfo
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- CN107422156A CN107422156A CN201710474716.9A CN201710474716A CN107422156A CN 107422156 A CN107422156 A CN 107422156A CN 201710474716 A CN201710474716 A CN 201710474716A CN 107422156 A CN107422156 A CN 107422156A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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Abstract
The embodiment of the invention discloses a kind of dynamic distortion power source based on high speed DMA fitting, for solving, the tester for electric energy meter or system can not produce the nonlinear waveforms such as the multiple zero passage waveform of peaked wave, voltage, and the technical problem that measurement standard causes measuring accuracy of the tester under fluctuating load to examine using standard electric energy meter mode in the prior art.The embodiment of the present invention includes：RAM, dma controller, Dual-channel digital analog converter, power amplifier, the waveform of default each cycle is stored in RAM；RAM, dma controller, Dual-channel digital analog converter, power amplifier are sequentially connected, and dma controller is used to transmitting the waveform of each cycle in RAM into Dual-channel digital analog converter the fitting for carrying out waveform by the typing order automatic cycle of waveform；Power amplifier is used to amplifying and exporting the waveform after fitting.
Description
Technical field
The present invention relates to Electrical Measuring Instrument field of instrumentation technology, more particularly to a kind of dynamic distortion based on high speed DMA fitting
Power source.
Background technology
With application of the development and Power Electronic Technique of Power Electronic Technique in all trades and professions, modern industrial production is set
The capacity of standby middle current converter is also increasing, and quantity is more and more, and load of the power network under actual operating state is usually not
It is stable state, and increasing, the fluctuation pattern disunity that distorts, and the test condition of traditional electric energy meter typically requires stable state work(
Rate source, the measuring accuracy under fluctuating load cannot often be examined, and the load under actual operating state is often not stable state,
This is possible to cause such situation：Electric energy meter is qualified in the first inspection in laboratory, examines and determine unqualified after hanging net operation, removes and send
It is qualified again to laboratory verification.The whether accurate of electric energy measurement data directly influences interests between power grid enterprises and user
And the reasonability of transaction.Therefore, industry relevant criterion suggests that the test of electric energy meter needs to increase non-linear test waveform, especially
It is the test waveforms such as the multiple zero passage waveform of voltage, peaked wave, and these waveforms have no the tester of specialty, mesh both at home and abroad at present
Preceding electric energy industry can not solve nonlinear load test problem.
The test of electric energy meter is typically tested using list, three phase power source or list, three-phase standard electric energy meter at present, technology into
It is ripe to be widely used, it is general to use single, three-phase standard electric energy meter as standard, to demarcate the degree of accuracy of tested electric energy meter, the program
The advantages of be that design difficulty is not high, cost is cheap, technology maturation, and shortcoming is that electric energy under the load that can not test dynamic distortion misses
Difference.The electric energy meter that a vector measurement calibration system FLUKE 6105 of Fiuke Co., Ltd's manufacture can be tested under integer harmonics misses
Difference, but the nonlinear waveforms such as the multiple zero passage waveform of peaked wave, voltage (Fourier's incomplete decomposing waveform) can not be produced.
The content of the invention
The embodiment of the invention discloses a kind of dynamic distortion power source based on high speed DMA fitting, solves prior art
In can not produce the nonlinear waveforms such as the multiple zero passage waveform of peaked wave, voltage for the tester or system of electric energy meter,
And measurement standard causes what measuring accuracy of the tester under fluctuating load cannot be examined using standard electric energy meter mode
Technical problem.
The embodiments of the invention provide a kind of dynamic distortion power source based on high speed DMA fitting, including：
RAM, dma controller, Dual-channel digital analog converter, power amplifier, default each cycle is stored in RAM
Waveform；
RAM, dma controller, Dual-channel digital analog converter, power amplifier are sequentially connected, and dma controller is used for RAM
In each cycle waveform by the typing order automatic cycle of waveform transmit to Dual-channel digital analog converter carry out waveform plan
Close；
Power amplifier is used to amplifying and exporting the waveform after fitting.
Alternatively, dma controller is connected by dma bus with RAM.
Alternatively, RAM is also connected with DSP Core by bus.
Alternatively, DSP Core are also associated with processing terminal, and processing terminal is used to pass through advance caused cycle waveform
DSP Core are downloaded to RAM.
Alternatively, processing terminal is connected by ethernet physical layer with DSP Core；
Connected between ethernet physical layer and DSP Core by bus.
Alternatively, dma controller is connected by synchronous serial interface with Dual-channel digital analog converter.
Alternatively, power amplifier includes current power amplifier and voltage power amplifier；
Current power amplifier and the A channel of Dual-channel digital analog converter connect；
The channel B of voltage power amplifier and Dual-channel digital analog converter connects.
Alternatively, Dual-channel digital analog converter is the Dual-channel digital analog converter of 16 bytes.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The embodiments of the invention provide a kind of dynamic distortion power source based on high speed DMA fitting, including：RAM, DMA are controlled
Device processed, Dual-channel digital analog converter, power amplifier, the waveform of default each cycle is stored in RAM；RAM, DMA are controlled
Device, Dual-channel digital analog converter, power amplifier are sequentially connected, and dma controller is used to press the waveform of each cycle in RAM
The typing order automatic cycle of waveform transmits to Dual-channel digital analog converter the fitting for carrying out waveform；Power amplifier is used to amplify
And export the waveform after fitting.By by the waveform of every kind of cycle, including the nonlinear wave such as distorted waveform, recording in the present embodiment
Shape, it is stored in advance in RAM and RAM waveform automatic cycle is sent to Dual-channel digital analog converter using high speed DMA controller
Complete the fitting of random waveform and through power amplifier amplify to export, so as to obtain including dynamic distortion nonlinear waveform
Various waveform outputs, realize the test and calibration of dynamic distortion load, solve in the prior art for electric energy meter
Tester or system can not produce the nonlinear waveforms such as the multiple zero passage waveform of peaked wave, voltage, and measurement standard uses standard
Electric energy meter mode and the technical problem for causing measuring accuracy of the tester under fluctuating load to examine.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is an a kind of reality of the dynamic distortion power source based on high speed DMA fitting provided in the embodiment of the present invention
Apply the structural representation of example；
Fig. 2 be the embodiment of the present invention in provide it is a kind of based on high speed DMA fitting dynamic distortion power source another
The structural representation of embodiment；
Fig. 3 is that a kind of DMA of the dynamic distortion power source based on high speed DMA fitting provided in the embodiment of the present invention is automatic
Transmitting procedure schematic diagram；
Fig. 4 (a) is a kind of DMA of the dynamic distortion power source based on high speed DMA fitting provided in the embodiment of the present invention
Address bit schematic diagram；
Fig. 4 (b) is a kind of DMA of the dynamic distortion power source based on high speed DMA fitting provided in the embodiment of the present invention
Passage control switching explanation schematic diagram.
Embodiment
The embodiments of the invention provide a kind of dynamic distortion power source based on high speed DMA fitting, for solving existing skill
The art of tester or system in to(for) electric energy meter can not produce the nonlinear waves such as the multiple zero passage waveform of peaked wave, voltage
Shape, and measurement standard causes measuring accuracy of the tester under fluctuating load to examine using standard electric energy meter mode
Technical problem.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Fig. 1 and Fig. 2 are referred to, a kind of dynamic distortion power based on high speed DMA fitting provided in the embodiment of the present invention
The one embodiment in source includes：
RAM1, dma controller 2, Dual-channel digital analog converter 3, power amplifier 4, store in RAM1 default each
The waveform of cycle；
RAM1, dma controller 2, Dual-channel digital analog converter 3, power amplifier 4 are sequentially connected, and dma controller 2 is used for
The waveform of each cycle in RAM1 is transmitted to Dual-channel digital analog converter 3 by the typing order automatic cycle of waveform and enters traveling wave
The fitting of shape；
Power amplifier 4 is used to amplifying and exporting the waveform after fitting.
Wherein, dma controller 2, Dual-channel digital analog converter 3, the quantity of power amplifier 4 are not specifically limited, can root
Selected according to being actually needed, meet 1:1:2 corresponding annexation.
Further, dma controller 2 is connected by dma bus with RAM1.
Further, RAM1 is also connected with DSP Core5 by bus.
Further, DSP Core5 are also associated with processing terminal 6, and processing terminal 6 is used for will advance caused cycle waveform
RAM1 is downloaded to by DSP Core5.
Further, processing terminal 6 is connected by ethernet physical layer 7 with DSP Core5；
Connected between ethernet physical layer 7 and DSP Core5 by bus.
Further, dma controller 2 is connected by synchronous serial interface with Dual-channel digital analog converter.
Further, power amplifier 4 includes current power amplifier and voltage power amplifier；
Current power amplifier is connected with the A channel of Dual-channel digital analog converter 3；
Voltage power amplifier is connected with the channel B of Dual-channel digital analog converter 3.
Further, Dual-channel digital analog converter 3 is the Dual-channel digital analog converter of 16 bytes.
It is to a kind of structure of the dynamic distortion power source based on high speed DMA fitting provided in an embodiment of the present invention above
It is described in detail, below by a kind of the specific of dynamic distortion power source based on high speed DMA fitting provided in an embodiment of the present invention
Operation principle is described in detail.
Referring to Fig. 2, by processing terminal 6, such as computer, notebook, Intelligent treatment terminal in the present invention, by each cycle
Waveform (including Ua, Ia, Ub, Ib, Uc, Ic passage) downloaded to by ethernet physical layer 7 and DSP Core5 in RAM1, need
It should be noted that the waveform of each cycle on processing terminal 6 generation can be calculated by MATLAB instruments or artificial fitting produces,
Waveform can also be produced by the actual recording of oscillograph or oscillograph scene.Wherein, processing terminal 6 downloads to waveform RAM1 speed
Rate is determined by the speed of Ethernet and DSP Core5 speed, after processing terminal 6 all downloads to waveform in RAM1,
DSP Core5 start the first dma controller 2a, the second dma controller 2b, the 3rd dma controller 2c, automatically RAM1 waveform
By the first dma controller 2a, the second dma controller 2b, the 3rd dma controller 2c and the first synchronous serial interface 8a, second same
Step serial ports 8b, the 3rd synchronous serial interface 8c are sent to the first Dual-channel digital analog converter 3a, the second Dual-channel digital analog converter 3b, the 3rd
The waveform fitting output of distorting loads is realized on Dual-channel digital analog converter 3c, passes through first voltage power after waveform fitting output
Amplifier 4Ua, the first current power amplifier 4Ia and second voltage power amplifier 4Ub, the second current power amplifier 4Ib
And tertiary voltage power amplifier 4Uc, the 3rd current power amplifier 4Ic realize signal amplification and bearing power it is defeated
Go out.Wherein, DSP Processor 9 uses ADSP-BF609Blackfin processors, the built-in He of ethernet physical layer 7 of the processor
First synchronous serial interface 8a, the second synchronous serial interface 8b, the 3rd synchronous serial interface 8c and DSP Core5 and the first dma controller 2a,
Second dma controller 2b, the 3rd dma controller 2c.DSP Processor 9 can realize the data RAM1 by every 80000 points of cycle
Waveform do not realized and automatically deliver by DSP Core5 intervention.
Random waveform (containing distorted waveform or recording) is sent by the network interface of low speed by processing terminal 6 in the present invention
To RAM1, RAM1 waveform automatic cycle is then sent to Dual-channel digital analog converter 3 using the dma controller 2 of high speed and completed
The fitting of random waveform, due to being automatically controlled using dma controller 2, while not consuming DSP Core5 it is achieved thereby that
80000 points of waveform fittings per cycle export, and can accurately be exported by the high-resolution of Dual-channel digital analog converter 3.Binary channels
Digital analog converter 3 realized using 16BIT AD5545 chips, the address bit that the switchings of two passages is inputted by AD5545 chips
To realize, first voltage power amplifier 4Ua, second voltage power amplifier 4Ub, tertiary voltage power amplifier 4Uc pass through
Power supply operational amplifier is realized using series negative feedback, and alternating current-direct current output can be achieved and band is wider than 1MHz, working power is +/-
200V can realize exchange 100V output, the first current power amplifier 4Ia, the second current power amplifier 4Ib, the 3rd electric current
Power amplifier 4Ic maximum output current is 15A, and alternating current-direct current stream 10A output can be achieved.
In the present invention dma controller 2 to the self-propagating process of waveform as shown in figure 3, the first DAM controllers 2a is controlled
RAM1 address automatic circle transmission in order, each sampled point from address 1 to address 80000*2 (two passages of Ua and Ia)
The number of significant digit of RAM waveforms is 18BIT, and front two is address bit, for selecting the first Dual-channel digital analog converter 3a A channel
Or channel B, rear 16Bit are the wave numerics of each sampled point, the Ua and Ia waveform storage order that staggers is：Ua1、Ia1、Ua2、
Ia...Ua80000, Ia80000, the 2nd DAM controllers 2b address ram is from address 1 to address 80000*2 (Ub and Ib two
Passage) automatic circle transmission in order, the number of significant digit per sampled point RAM waveforms is 18BIT, and front two is address bit, is used for
The second Dual-channel digital analog converter 3b A channel or channel B is selected, rear 16Bit is the wave numerics of each sampled point, Ub and Ib
The waveform storage order that staggers be Ub1, Ib1, Ub2, Ib...Ub80000, Ib80000, the 3rd DAM controllers 2c address ram
The automatic circle transmission in order from address 1 to address 80000*2 (two passages of Uc and Ic), per the effective of sampled point RAM waveforms
Digit is 18BIT, and front two is address bit, for selecting the 3rd Dual-channel digital analog converter 3c A channel or channel B, after
16Bit is the wave numerics of each sampled point, Uc and Ic waveform stagger storage order be Uc1, Ic1, Uc2,
Ic...Uc80000、Ic80000。
The DMA of the present invention automatically controls passage switching output as shown in Fig. 4 (a) to Fig. 4 (b), and RAM1 deposits Ua sampling
The high address position of value is：A1 is 1, A0 0；The high address position of storage Ia sampled points is：A1 is 0, A0 1；Deposit Ua's
The 16Bit numerical value of sampled value is D15~D0, and the 16Bit numerical value for depositing Ia sampled value is D15~D0, passage B and channel C and
Passage A principle is identical.Specifically, as shown in figure 4, dma controller 2a when sampled point 1 (Ua) is exported, is understood highest
Position and secondary high-order A0 outputs are #01B, and it is #10B that highest order and time high-order A0 can be exported when exporting sampled point 1 (Ia), this
As long as sample is in advance (1 address location in RAM areas<<And (2 16)<<16), waveform below will automatically select D/A (3a) and be
A channel or channel B.UB and IC with UC with the IC course of work are identical with UAIA.
The embodiments of the invention provide a kind of dynamic distortion power source based on high speed DMA fitting, including：RAM, DMA are controlled
Device processed, Dual-channel digital analog converter, power amplifier；RAM, dma controller, Dual-channel digital analog converter, power amplifier according to
Secondary connection, dma controller are used to by the typing order automatic cycle of waveform transmit the waveform of each cycle in RAM to bilateral
Road digital analog converter carries out the fitting of waveform；Power amplifier is used to amplifying and exporting the waveform after fitting.Lead in the present embodiment
Cross the waveform of every kind of cycle, including the nonlinear waveform such as distorted waveform, recording, be stored in advance in RAM and utilize high speed DMA
RAM waveform automatic cycle is sent to Dual-channel digital analog converter and completes the fitting of random waveform and through power amplifier by controller
Amplification output, so as to obtain the various waveforms output including dynamic distortion nonlinear waveform, realize dynamic distortion load
Test and calibration, peaked wave, electricity can not be produced by solving the tester for electric energy meter in the prior art or system
The nonlinear waveforms such as multiple zero passage waveform are pressed, and measurement standard causes tester negative in fluctuation using standard electric energy meter mode
The technical problem that measuring accuracy under carrying cannot be examined.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
- A kind of 1. dynamic distortion power source based on high speed DMA fitting, it is characterised in that including：RAM, dma controller, Dual-channel digital analog converter, power amplifier, default each cycle is stored in the RAM Waveform；The RAM, the dma controller, the Dual-channel digital analog converter, the power amplifier are sequentially connected, the DMA Controller is used to by the typing order automatic cycle of the waveform transmit the waveform of each cycle in the RAM to described double Passage digital analog converter carries out the fitting of the waveform；The power amplifier is used to amplifying and exporting the waveform after fitting.
- 2. the dynamic distortion power source according to claim 1 based on high speed DMA fitting, it is characterised in that the DMA controls Device processed is connected by dma bus with the RAM.
- 3. the dynamic distortion power source according to claim 1 based on high speed DMA fitting, it is characterised in that the RAM is also DSP Core are connected with by bus.
- 4. the dynamic distortion power source according to claim 3 based on high speed DMA fitting, it is characterised in that the DSP Core is also associated with processing terminal, and the processing terminal is used to download by the DSP Core caused cycle waveform in advance To the RAM.
- 5. the dynamic distortion power source according to claim 4 based on high speed DMA fitting, it is characterised in that the processing Terminal is connected by ethernet physical layer with the DSP Core；Connected between the ethernet physical layer and the DSP Core by bus.
- 6. the dynamic distortion power source according to claim 1 based on high speed DMA fitting, it is characterised in that the DMA controls Device processed is connected by synchronous serial interface with the Dual-channel digital analog converter.
- 7. the dynamic distortion power source according to claim 1 based on high speed DMA fitting, it is characterised in that the power Amplifier includes current power amplifier and voltage power amplifier；The current power amplifier is connected with the A channel of the Dual-channel digital analog converter；The voltage power amplifier is connected with the channel B of the Dual-channel digital analog converter.
- 8. the dynamic distortion power source according to claim 1 based on high speed DMA fitting, it is characterised in that the bilateral Road digital analog converter is the Dual-channel digital analog converter of 16 bytes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112181039A (en) * | 2020-10-22 | 2021-01-05 | 国网江苏省电力有限公司营销服务中心 | Direct current standard power source with ripple superposition based on DMA and programmable time base |
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