CN102809705A - Method for realizing high-speed high-accuracy sampling by multi-analog-to-digital (A/D) cooperation - Google Patents
Method for realizing high-speed high-accuracy sampling by multi-analog-to-digital (A/D) cooperation Download PDFInfo
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- CN102809705A CN102809705A CN2012103077152A CN201210307715A CN102809705A CN 102809705 A CN102809705 A CN 102809705A CN 2012103077152 A CN2012103077152 A CN 2012103077152A CN 201210307715 A CN201210307715 A CN 201210307715A CN 102809705 A CN102809705 A CN 102809705A
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Abstract
The invention discloses a method for realizing high-speed high-accuracy sampling by multi-analog-to-digital (A/D) cooperation, which is mainly used in an A/D sampling system of an on-line monitoring device for the quality of electric energy. Because the transient characteristic of the analog quantity needs to be accurately measured, very high requirements on the A/D collecting accuracy and speed are presented. One important factor determining the sampling accuracy is the bit number of A/D chips, but for the A/D chips, the conversion speed is slower when the sampling accuracy is higher, which is a pair of contradiction. In order to ensure the A/D sampling accuracy and enhance the sampling rate simultaneously, the method proposes that a plurality of A/D chips are used for carrying out cooperative sampling on a same analog channel, and data after being converted are placed into a data buffer for carrying out united processing, so that the problems that the conversion time of the high-accuracy A/D chips is too long and the sampling interval is longer than the conversion time are avoided, and the aim of high-speed high-accuracy A/D conversion is realized.
Description
Technical field
The present invention relates to realize in a kind of A/D sampling system of electric energy quality on-line monitoring device the method for high-speed, high precision A/D sampling.
Background technology
Quality of power supply on-line monitoring technique device to measuring accuracy require increasingly high; The transient changing process is wanted and can accurately be caught; Therefore need carry out the A/D sampling of high-speed, high precision to analog channel in the electric energy quality on-line monitoring device, but A/D sampling A switching time of present stage SAR (approaching one by one) type 16BIT between 3 μ s-4 μ s, and the system frequency of device is designed to 409600HZ; Requirement will be accomplished an A/D conversion in less than 2.5 μ s; Accomplish reading and depositing of A/D data simultaneously, obviously monolithic A/D chip can not be accomplished this work, must adopt new method.
Summary of the invention
In order to solve the contradiction that A/D sampling high speed and high precision can not get both simultaneously; The invention provides a kind of high-speed, high precision method of sampling that realizes electric energy quality on-line monitoring device, can be controlled in and carry out A/D conversion in the 2.5 μ s and accomplish the conversion of data simultaneously and read.
The technical scheme that the present invention taked is:
The collaborative method that realizes the high-speed, high precision sampling of a kind of many A/D; It is characterized in that; A/D chip with the parallel connection of FPGA control multi-disc is worked in coordination with sampling to same analog channel in the electric energy quality on-line monitoring device; Multi-disc A/D chip is sampled with same SI T successively, reads in sampled result simultaneously.
Said A/D chip is the A/D chip of SAR (approaching one by one) type 16BIT.
The system frequency of electric energy quality on-line monitoring device is f, and the time that the collaborative N sheet A/D chip of FPGA is accomplished an A/D conversion to this analog channel is 1/f, is 1/f * N for every its SI of A/D chip then.
Said A/D chip input end is provided with voltage follower.
The beneficial effect that the present invention reached:
Owing to want the transient state characteristic of accurate measure analog amount, like this A/D acquisition precision and speed proposed high requirement.The figure place that important factor of decision sampling precision is the A/D chip, but the high more slewing rate of sampling precision is slow more for the A/D chip, and this is a pair of contradiction.When guaranteeing the A/D sampling precision; Improve sampling rate; This method has proposed with multi-disc A/D chip same analog channel to be worked in coordination with sampling, and the data after the conversion are put into the data buffer and carried out Unified Treatment, thereby has avoided high-precision A/D chip long switching time; The problem that SI is also longer than switching time has realized the A/D conversion of high-speed, high precision.
Embodiment
Further describe in the face of the present invention down.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Method of the present invention can adopt two or multi-disc high-precision A/D that same analog channel work in coordination with sampling, and sampled data is carried out unified management, thereby the realization high-speed sampling is avoided the not high problem of monolithic A/D sampling rate.In quality of power supply on-line monitoring technique device; In the present embodiment; In order to guarantee time margin, adopted 16 of 3 ANALOG DEVICES companies of FPGA (field programmable gate array) control, the A/D chip AD7606 of 200KSPS that same analog channel work in coordination with sampling, install SF and be designed to 409600HZ; Collaborative 3 A/D of FPGA are that 2.44140625 μ s sample successively with the SI, read in sampled result simultaneously.For monolithic A/D chip, be spaced apart 2.44140625 μ s * 3, the conversion required time much larger than AD7606 has guaranteed sampling precision and sample rate, satisfies the A/D sampling needs that analog channel carried out high-speed, high precision.
Because the analog input impedance of AD7606 is about 1M Europe, after 3 AD7606 parallel connections, make the analog input impedance diminish, must to improve the analog input impedance, make that the precision of sampling is higher at AD7606 input end making alive follower for this reason.
Electric energy quality on-line monitoring device adopts above-mentioned sampling system, and sampling precision is high, reaches re-set target.
More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain by appending claims and equivalent circle thereof.
Claims (4)
1. A/D more than a kind works in coordination with the method that realizes the high-speed, high precision sampling; It is characterized in that; A/D chip with the parallel connection of FPGA control multi-disc is worked in coordination with sampling to same analog channel in the electric energy quality on-line monitoring device; Multi-disc A/D chip is sampled with same SI T successively, reads in sampled result simultaneously.
2. the collaborative method that realizes the high-speed, high precision sampling of many A/D according to claim 1 is characterized in that said A/D chip is the A/D chip of SAR type 16BIT.
3. the collaborative method that realizes the high-speed, high precision sampling of many A/D according to claim 1; It is characterized in that; The system frequency of electric energy quality on-line monitoring device is f; The time that the collaborative N sheet A/D chip of FPGA is accomplished an A/D conversion to this analog channel is 1/f, is 1/f * N for every its SI of A/D chip then.
4. the collaborative method that realizes the high-speed, high precision sampling of many A/D according to claim 1 is characterized in that said A/D chip input end is provided with voltage follower.
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| CN2012103077152A CN102809705A (en) | 2012-08-28 | 2012-08-28 | Method for realizing high-speed high-accuracy sampling by multi-analog-to-digital (A/D) cooperation |
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| CN2012103077152A CN102809705A (en) | 2012-08-28 | 2012-08-28 | Method for realizing high-speed high-accuracy sampling by multi-analog-to-digital (A/D) cooperation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467853A (en) * | 2014-12-05 | 2015-03-25 | 安徽鑫龙电器股份有限公司 | AD switching circuit |
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Application publication date: 20121205 Assignee: NANJING GUODIAN NANZI RURAL POWER GRID AUTOMATION ENGINEERING CO., LTD. Assignor: Nanjing Automation Co., Ltd., China Electronics Corp. Contract record no.: 2013320000276 Denomination of invention: Method for realizing high-speed and high-precision sampling by multiple A/D cooperation License type: Exclusive License Record date: 20130401 |
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