CN104375435A - Signal sampling system and method - Google Patents

Signal sampling system and method Download PDF

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Publication number
CN104375435A
CN104375435A CN201410396399.XA CN201410396399A CN104375435A CN 104375435 A CN104375435 A CN 104375435A CN 201410396399 A CN201410396399 A CN 201410396399A CN 104375435 A CN104375435 A CN 104375435A
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sensor
range
signal
sampling
sample circuit
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劳长石
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INSTITUTE OF NEW ENERGY SHENZHEN
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INSTITUTE OF NEW ENERGY SHENZHEN
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention belongs to the field of signal sampling and provides a signal sampling method and system. The signal sampling system comprises multiple sensors, multiple sampling circuits and a controller, wherein the measuring ranges of the multiple sensors are different, the multiple sensors are used for converting acquired signals into corresponding analog electric signals, the sampling frequencies of the sampling circuits correspond to the measuring ranges of the sensors, the controller is used for selecting one sensor with the corresponding measuring range according to the value of a certain acquired signal to be used for sampling output, the acquired signals are detected by the input ends of the multiple sensors, the output ends of the sensors are connected with the input ends of the sampling circuits, the sampling frequencies of the sampling circuits correspond to the measuring ranges of the sensors, and the output ends of the sampling circuits are connected with the controller. The signal sampling method and system can be adapted to acquired signals with different degrees of intensity, the corresponding sensors and the corresponding sampling frequencies are adopted according to the acquired signals with different degrees of intensity, and thus a measurement value with higher precision can be obtained.

Description

A kind of signal sampling system and method
Technical field
The invention belongs to signal sampling field, particularly relate to a kind of signal sampling system and method.
Background technology
When photovoltaic combining inverter ac output current controlled or other control to output current, the current value to exporting is needed to gather, using the feedback signal of gathered current value as Current Control, current controller or matrix current adjustment circuit, according to gathered current feedback signal, adjust the size of output current accordingly.
Collection at present to current value, is usually adopted current sensor to gather induced signal corresponding to current value size, is sampled by AD sample circuit to described induced signal, obtain the current value after sampling.By the current value after described sampling by processor relatively after, send corresponding steering order, realize the adjustment to output current signal.
Owing to being subject to the impact of environment or other disturbing factor, the current value of output and the size of other collected signal can change, and the restriction of the range of sensor itself, make the collected signal value measured may occur larger error.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of signal sampling system and method, with solve prior art because of the size of collected signal change time, the restriction of the range of sensor itself, makes collected signal occur the problem of error.
The embodiment of the present invention realizes like this, a kind of signal sampling system, described system comprise multiple different range, for collected signal being converted into sensor, the multiple sample circuit corresponding with the range of described sensor of corresponding analog electrical signal and being used for selecting the sensor of defeated corresponding range as the controller exported of sampling according to the size of described collection signal value, wherein:
The input end of described multiple sensor detects collected signal;
The output terminal of described sensor is connected with the input end of described sample circuit, and the sample frequency of described sample circuit is corresponding with the range of described sensor;
The output terminal of described sample circuit is connected with described controller.
Another object of the embodiment of the present invention is to provide a kind of signal sampling method, and described signal sampling method is based on above-mentioned signal sampling system, and described method comprises:
Obtain the range ability of the sensor belonging to signal value of collected signal;
The range ability of the sensor belonging to the signal value of collected signal, searches the sensor corresponding to this range ability;
The sample frequency corresponding according to searched sensor, sampling obtains value corresponding to collected signal.
In the present invention, gather measured signal by arranging multiple sensor, can gather measured signal by different sensors, controller is according to the size of collected signal simultaneously, select the sensor of corresponding range, and obtain value corresponding to collected signal by corresponding sample frequency sampling.Compared to the prior art, the present invention according to the collected signal varied in size, can adopt corresponding sensor and sample frequency, thus while can adapting to the collected signal varied in size, also can improve the measuring accuracy of collected signal.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the signal sampling system that first embodiment of the invention provides;
Fig. 2 is the schematic diagram being controlled sensor switching by return difference impulsive that second embodiment of the invention provides;
Fig. 3 is the realization flow figure of the signal sampling method that third embodiment of the invention provides;
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention can be applicable to carry out collection occasion by sensor to the signal of various change, as handed over the collection of the ac output current in net inverter for photovoltaic, or other signal value exported can produce the voltage, temperature, pressure, humidity etc. of fluctuation.When the present invention can to overcome in prior art by sensor measurement signal, due to the restriction of the range of sensor own, the problem obtaining the accurate measurements corresponding to signal changed can not be measured.Further illustrate below by embodiment.
Embodiment one:
Fig. 1 shows the structured flowchart of the signal sampling system that first embodiment of the invention provides, and details are as follows:
Signal sampling system described in embodiments of the present invention, comprise multiple different range, for collected signal being converted into the sensor 101 of corresponding analog electrical signal, the multiple sample circuits 102 corresponding with the range of described sensor and being used for the controller 103 of selecting the sensor of defeated corresponding range to export as sampling according to the size of described collection signal value, wherein:
The input end of described multiple sensor 101 detects collected signal;
The output terminal of described sensor 101 is connected with the input end of described sample circuit 102, and the sample frequency of described sample circuit 102 is corresponding with the range of described sensor 101;
The output terminal of described sample circuit 102 is connected with described controller 103.
Concrete, for being different from the structure difference of various different sensor, in the embodiment of the present invention and follow-up embodiment, described sensor 101 is converting member measured signal being converted into analog electrical signal, in current sensor, voltage sensor, light sensor, voltage sensitive sensor, displacement transducer, speed pickup or temperature sensor one or more.
Wherein, current sensor is different according to measuring principle, mainly can be divided into: shunt, electromagnetic current transducer, electronic current mutual inductor etc.Electronic current mutual inductor comprises Hall current sensor, Rogowski current sensor and is exclusively used in the variable-frequency power sensor etc. of frequency conversion electrical measurement.
The range of sensor described in the embodiment of the present invention, is also the measurement range of sensor, refers to the acquisition range of sensor for collected signal, generally, the range corresponding to different sensors can not be identical, as being [a for the range of sensors A, b], range corresponding to sensor B is [b, c], and the range corresponding to sensor C is [c, d], therefore, sensors A, B and C can be used to measure the collected signal that input interval is [a, d].Certainly, the range of the sensor A, B and C also can comprise more common factors, can get the boundary value of a value in common factor as two transducer ranges.When selecting sensor, directly corresponding sensor can be found by the range interval belonging to the value of collected signal.
In addition, the range of described sensor also can be zero-based scope.So, now select sensor according to being that the maximal value of the range of sensor is greater than collected signal, and from the nearest sensor of described collected signal value.
Sample circuit described in the embodiment of the present invention, for the simulating signal of sensor collection is converted into digital signal, it generally receives a simulating signal input, by a control signal input, obtains an analog signal output.The effect of this circuit is the reception input voltage in certain regulation, and keeps this voltage till next time, sampling started at output terminal.Sample circuit has an analog switch usually, a holding capacitor and unity gain be 1 same circuitry phase form.
Sample circuit described in the embodiment of the present invention, can be the sample circuit of simulation, also can be integrated sampling A/D chip.When using integrated sampling A/D chip, the frequency of sampling can be controlled easily by controlling pin, thus be convenient to distinguish under different collected signals, controlling the sample frequency of sample circuit, to make it corresponding with transducer range.
The sample frequency of the sample circuit described in the embodiment of the present invention is corresponding with the range of described sensor, the sample frequency that can be understood as described sample circuit increases along with the increase of the range of described sensor, reduces along with the reduction of the range of described sensor.
Such as, be the current sensor of 1A for range, gather current signal and output voltage signal time, its voltage signal scope exported is 0 to 2.5 volt, suppose that the sampling input range of sample circuit is 5 volts, and the sample frequency of its correspondence is 10 bit AD samples, so, be 0-1024 by the AD numerical range obtained of sampling, and the size of the measured current value of each numerical value representative, also namely resolution is 5/2.5/1204 peace, also i.e. 2/1024 peace.Suppose that this resolution meets sampling request, so, be the current sensor of 10A for range, suppose at collection current signal and output voltage signal still for 2.5V, so, corresponding input sample voltage range is still 5 volts, so corresponding sampling resolution can be set to 14, so the AD numerical range obtained of sampling is 0-4096, each numerical value represents measured current value size, is also namely distinguished as 5/ (2.5/10)/16384=1.25/1024 peace, therefore, its resolution also should meet the requirement of sampling.
Therefore the present invention, by selecting the size of sample frequency accordingly to the size of the range of sensor, can realize the requirement ensureing measuring accuracy.
In addition, as the embodiment that the present invention one optimizes, can be directly proportional to the range of described sensor by the sample frequency arranging described sample circuit.Be specially, when the range change of described sensor, according to the ratio of the maximum sampled value that described range and described sampling resolution obtain, range as current in sensor is 1 ampere, the maximum sampled value that corresponding sampling resolution obtains is 1024, and so its ratio is 1/1024, so when electric current is 2 ampere-hours, the maximum sampled value of corresponding sampling resolution is 2048, also i.e. 11 samplings.Certainly, when the figure place that described maximum sampled value is corresponding is not integer, can be got this for the figure place of integer is nearest, and be greater than the figure place of integer as correspondence of described figure place.
In addition, for improving the precision of collection further, the scope of the output signal of described sensor is identical with the input voltage of described sampled signal.Thus better ensure that the voltage exported can be sampled completely.
Controller described in the embodiment of the present invention, it can be several data processing controls chip, include but not limited to that (English full name is digital signal processor to DSP, Chinese full name is digital signal processor), (English full name is Field-Programmable Gate Array to FPGA, Chinese full name is field programmable gate array) and single-chip microcomputer etc.
In addition, as the embodiment that the present invention is possible, described sample circuit can be integrated in described controller, completes the sampling to analog electrical signal by controller.
Controller described in the embodiment of the present invention, for according to collected signal as selection gist, select signal value that the sensor of corresponding range gathers as sampled signal values.Wherein, the collected signal as selection gist that described controller obtains, the sensor that can collect collection value by any one in multiple sensor obtains, the sensor that also can arrange range in addition larger obtains, because this is as the collected signal value of selection gist, can be not high to its accuracy requirement, therefore, the sensor of wide range can meet its requirement selected.
In the embodiment of the present invention, the input end of described multiple sensor detects collected signal, refer to that sensor setting is in the environment at collected signal place, as the current sensor for Hall-type, then by sensor setting around collected current signal, for the sensor such as temperature, humidity, then sensor is put in collected environment, and multiple sensor parallel, the signal making sensor change is identical.
The output terminal of described sensor is connected with the input end of described sample circuit, refer to that multiple sensor connects multiple sample circuit respectively, and the sample frequency of described sample circuit is corresponding with the range of described sensor.Describe above about corresponding relation, do not repeat at this.
The output terminal of described sample circuit is connected with described controller, namely the sampled output signal of sample circuit is connected with controller, described controller can choice accuracy is the highest from the output signal of multiple sample circuit sampled output signal, certainly, be not limited to this, controller of the present invention can also control pin with the sample frequency of described sample circuit and be connected, to arrange the frequency of described sample circuit; Described controller can also be connected with the switch of sensor, by controlling the switch of sensor, by obviously not meeting the sensor closedown gathering and require, to save system energy consumption.
In addition, as the embodiment of the another optimization of the embodiment of the present invention, the range boundary of different current sensors is provided with return difference impulsive, and described controller obtains being sampled sampled value when signal switches in different range according to described return difference impulsive.Be described as follows with two sensor signals, as shown in Figure 2, the range ability of sensor 1 is 0-1 ampere, and the range of sensor 2 is 0-5 ampere, supposes that the return difference impulsive arranged is positive and negative 0.05 ampere of current sensor boundary value, so when actual current changes from small to big, be greater than 1.05 ampere-hours at electric current, be switched to sensor 2 from sensor 1, when electric current from large to small, be less than 0.95 ampere-hour at electric current, be switched to sensor 1 from sensor 2.Thus can effectively prevent because sampling error causes current oscillation.
The embodiment of the present invention is by arranging the sample circuit of multiple sensor and multiple sample frequency of mating with transducer range, the sensor using specific range is determined by the size of collected signal, and by the sample frequency of mating with this range, obtain the sampled signal that degree of accuracy is higher.In addition, return difference impulsive is set by the boundary value place at sensor, effectively can prevents the current oscillation because sampling error causes.
Embodiment two:
Fig. 3 shows the realization flow of the signal sampling method that second embodiment of the invention provides, and details are as follows:
Signal sampling method described in the embodiment of the present invention, it is in signal sampling system described in embodiment one, and described method comprises:
In step S301, obtain the range ability of the sensor belonging to signal value of collected signal.
Concrete, the range ability of the sensor belonging to signal value of described acquisition collected signal, range ability wherein can for separately range is interval, as for range being two sensors of [A, B] and [B, C], its range interval can be directly used in searching of range ability belonging to collected signal, when the range of two sensors be respectively [0, A] and [0, B] and A>B time, then can be divided into [0, A], [A, B] two intervals.
Equally, in the embodiment of the present invention to described sensor can be in current sensor, voltage sensor, light sensor, voltage sensitive sensor, displacement transducer, speed pickup or temperature sensor one or more.
In step s 302, the range ability of the sensor belonging to the signal value of collected signal, searches the sensor corresponding to this range ability.
After the range of step S301 to sensor divides, by comparing the method for searching, can directly find the range ability belonging to collected signal.Thus find sensor corresponding to this range ability.
In step S303, the sample frequency corresponding according to searched sensor, sampling obtains value corresponding to collected signal.
Wherein, the frequency acquisition that described sensor is corresponding, can increase along with the increase of the range of described sensor for the sample frequency of described sample circuit, reduce along with the reduction of the range of described sensor.Can certainly the sample frequency of described sample circuit be directly proportional to the range of described sensor.
As the embodiment that the embodiment of the present invention is optimized further, the range boundary of different current sensors is provided with return difference impulsive, described controller obtains being sampled sampled value when signal switches in different range according to described return difference impulsive.
The corresponding functional part of signal sampling method and sampling apparatus described in embodiment 1 in the embodiment of the present invention, its specific implementation is identical, does not repeat at this.
In addition, as a kind of optimal enforcement scene of the present invention, in hand over the output current of net inverter to control to photovoltaic, signal sampling method of the present invention and sampling apparatus are adopted to described output current, sampling resolution can be made to improve, thus effectively can ensure the power factor that civil power exports, and it is very little in the flip-flop of alternating current output, when milliampere level, the reduction of sampling error, controller can be made, as DSP increases the control accuracy of DC component, the DC component exported is diminished, by improving the precision of closed-loop control, effectively can control the harmonic wave of output current.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a signal sampling system, it is characterized in that, described system comprise multiple different range, for collected signal being converted into sensor, the multiple sample circuit corresponding with the range of described sensor of corresponding analog electrical signal and being used for selecting the sensor of defeated corresponding range as the controller exported of sampling according to the size of described collection signal value, wherein:
The input end of described multiple sensor detects collected signal;
The output terminal of described sensor is connected with the input end of described sample circuit, and the sample frequency of described sample circuit is corresponding with the range of described sensor;
The output terminal of described sample circuit is connected with described controller.
2. system according to claim 1, it is characterized in that, the sample frequency of described sample circuit is corresponding with the range of described sensor to be specially:
The sample frequency of described sample circuit increases along with the increase of the range of described sensor, reduces along with the reduction of the range of described sensor.
3. system according to claim 1 or 2, is characterized in that, the sample frequency of described sample circuit is directly proportional to the range of described sensor.
4. system according to claim 1, it is characterized in that, the range boundary of different current sensors is provided with return difference impulsive, described controller obtains being sampled sampled value when signal switches in different range according to described return difference impulsive.
5. system according to claim 1, it is characterized in that, described sensor is current sensor, voltage sensor, light sensor, voltage sensitive sensor, displacement transducer, speed pickup or temperature sensor.
6. a signal sampling method, is characterized in that, described signal sampling method is based on signal sampling system according to claim 1, and described method comprises:
Obtain the range ability of the sensor belonging to signal value of collected signal;
The range ability of the sensor belonging to the signal value of collected signal, searches the sensor corresponding to this range ability;
The sample frequency corresponding according to searched sensor, sampling obtains value corresponding to collected signal.
7. method according to claim 6, it is characterized in that, the sample frequency that described sensor passage is corresponding is specially:
The sample frequency of described sample circuit increases along with the increase of the range of described sensor, reduces along with the reduction of the range of described sensor.
8. method according to claim 7, it is characterized in that, the sample frequency of described sample circuit is directly proportional to the range of described sensor.
9. method according to claim 6, it is characterized in that, the range boundary of different current sensors is provided with return difference impulsive, described controller obtains being sampled sampled value when signal switches in different range according to described return difference impulsive.
10. method according to claim 6, it is characterized in that, described sensor is current sensor, voltage sensor, light sensor, voltage sensitive sensor, displacement transducer, speed pickup or temperature sensor.
CN201410396399.XA 2014-08-13 2014-08-13 Signal sampling system and method Pending CN104375435A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107238410A (en) * 2017-06-19 2017-10-10 上海斐讯数据通信技术有限公司 A kind of wearable device and intelligence sample method
CN107479008A (en) * 2016-06-08 2017-12-15 英飞凌科技股份有限公司 Chip packing-body and its manufacture method and operating method and chip package system
CN109752652A (en) * 2017-11-07 2019-05-14 上海大郡动力控制技术有限公司 The method of sampling of permanent magnet synchronous motor phase current
CN110111549A (en) * 2018-02-01 2019-08-09 欧姆龙株式会社 Input unit
CN112325919A (en) * 2020-10-21 2021-02-05 中国科学院地质与地球物理研究所 Self-adaptive adjustment sensor system and use method thereof
WO2022227113A1 (en) * 2021-04-30 2022-11-03 深圳市谷粒科技有限公司 Dynamic sampling method and device for analog sensor
CN115833705A (en) * 2023-02-15 2023-03-21 中国科学院宁波材料技术与工程研究所 Seamless switching method and device between multiple current sensors of rim motor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107479008A (en) * 2016-06-08 2017-12-15 英飞凌科技股份有限公司 Chip packing-body and its manufacture method and operating method and chip package system
CN107238410A (en) * 2017-06-19 2017-10-10 上海斐讯数据通信技术有限公司 A kind of wearable device and intelligence sample method
CN109752652A (en) * 2017-11-07 2019-05-14 上海大郡动力控制技术有限公司 The method of sampling of permanent magnet synchronous motor phase current
CN109752652B (en) * 2017-11-07 2021-02-02 上海大郡动力控制技术有限公司 Phase current sampling method for permanent magnet synchronous motor
CN110111549A (en) * 2018-02-01 2019-08-09 欧姆龙株式会社 Input unit
CN110111549B (en) * 2018-02-01 2021-12-14 欧姆龙株式会社 Input unit
CN112325919A (en) * 2020-10-21 2021-02-05 中国科学院地质与地球物理研究所 Self-adaptive adjustment sensor system and use method thereof
CN112325919B (en) * 2020-10-21 2021-08-31 中国科学院地质与地球物理研究所 Self-adaptive adjustment sensor system and use method thereof
WO2022227113A1 (en) * 2021-04-30 2022-11-03 深圳市谷粒科技有限公司 Dynamic sampling method and device for analog sensor
CN115833705A (en) * 2023-02-15 2023-03-21 中国科学院宁波材料技术与工程研究所 Seamless switching method and device between multiple current sensors of rim motor

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Application publication date: 20150225