CN108562795A - A kind of solar cell impedance measurement system - Google Patents
A kind of solar cell impedance measurement system Download PDFInfo
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- CN108562795A CN108562795A CN201810345251.1A CN201810345251A CN108562795A CN 108562795 A CN108562795 A CN 108562795A CN 201810345251 A CN201810345251 A CN 201810345251A CN 108562795 A CN108562795 A CN 108562795A
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- 238000002847 impedance measurement Methods 0.000 title claims abstract description 91
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000012546 transfer Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 230000006870 function Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The present invention provides a kind of solar cell impedance measurement systems, including：Control module, impedance measurement module, range handover module, wherein control module completes corresponding function for coordinating steady operation between modules, control modules, realizes system control and data transmission；Impedance measurement module is used to carry out impedance measurement to solar cell, and by data transfer to control module, measurement data is uploaded to host computer by control module；Range handover module includes a digital regulation resistance, changes the feedback resistance value of digital regulation resistance according to the measurement result of impedance measurement module, adjusts impedance measurement range in real time, measurement result is made to remain within range or close to full scale, to improve measurement accuracy.The present invention has mended the blank of solar cell impedance measurement technique, and the measuring system is easy to operate, simple for structure, at low cost, small, low in energy consumption.
Description
Technical field
The present invention relates to solar cell field of measuring technique, more particularly to a kind of solar cell impedance measurement system.
Background technology
Solar energy power generating industry is most fast one of the new industry of global evolution, solar cell detection method and equipment
Also it is evolving and updates.With efficiency of solar cell significantly improve and the novel thin films such as dye sensitization, perovskite too
The fast development in positive electricity pond, the capacitance characteristic and impedance operator for characterizing solar cell are particularly important.Current research is found, is led to
Crossing measurement analysis solar cell impedance, can to obtain its series resistance, parallel resistance, battery capacitor and minority carrier life time, impurity dense
Degree etc. parameters, more fully show solar cell characteristic, while can also be applied to thin film solar cell new material screening,
Preparation process selects and the research of optimization of process conditions, and tradition solar cell I-V measuring techniques can not meet this demand.
Currently, there are many impedance measuring Instruments that domestic and international company develops, such as Japan's Hioki IM7587 impedance analyzers, U.S. on the market
The steady section 6500B impedance analyzers in Shenzhen etc. of state's Agilent E4990 series impedances analyzers and domestic autonomous production.But not
There is a impedometer designed specifically for solar cell.
Invention content
(1) technical problems to be solved
In view of above-mentioned technical problem, the present invention provides a kind of solar cell impedance measurement systems.
(2) technical solution
According to an aspect of the invention, there is provided a kind of solar cell impedance measurement system, including：Control module, resistance
Anti- measurement module, range handover module, wherein
Control module completes corresponding function for coordinating steady operation between modules, control modules,
Realization system controls and data transmission；
Impedance measurement module is used to carry out impedance measurement to solar cell, and by data transfer to control module, by
Measurement data is uploaded to host computer by control module；
Range handover module includes a digital regulation resistance, changes digital regulation resistance according to the measurement result of impedance measurement module
Feedback resistance value, adjust impedance measurement range in real time, measurement result made to remain within range or close to full scale, with
Improve measurement accuracy.
Preferably, the control module uses STM32 chips.
Preferably, the impedance measurement module includes impedance measurement chip, operational amplifier, divider resistance, wherein
Control module is transmitted to impedance measurement chip and is instructed, and pumping signal is exported by impedance measurement chip, the pumping signal
After divider resistance and operational amplifier, solar cell to be measured, pumping signal is encouraged to become response letter after solar cell
Number, which is sampled by impedance measurement chip, is obtained by signal processing after the digital regulation resistance of range handover module
To the impedance measurements of solar cell.
Preferably, the signal processing includes low-pass filtering, programme-controlled gain amplification and discrete Fourier transform.
Preferably, impedance measurement chip uses AD5933 chips.
Preferably, the model AD5111 of the digital regulation resistance has the ends vernier W, is examined after measuring every time
Its measurement result is surveyed whether in range ability or close to full scale, the position at the ends vernier W is adjusted according to testing result, to change
Become feedback resistance value, to adjust impedance measurement range in real time.
Preferably, the range handover module further includes two capacitances in parallel, and in parallel with digital regulation resistance.
Preferably, the solar cell impedance measurement system further includes communication module, is connect with control module, for that will survey
Amount data are transmitted to host computer by control module.
Preferably, the solar cell impedance measurement system further includes power supply module comprising two independent switch electricity
Source, the respectively numerical portion of solar cell impedance measurement system and analog portion power, to reduce numerical portion and simulation part
Divide and interferes with each other.
Preferably, the solar cell impedance measurement system further includes a liquid crystal display, shows measurement result.
(3) advantageous effect
It can be seen from the above technical proposal that solar cell impedance measurement system of the present invention at least has the advantages that
One of them：
(1) measuring system provided by the invention is specific to solar cell design, compensates for solar cell impedance survey
The blank of amount technology, the measuring system are easy to operate, simple for structure, at low cost, small, low in energy consumption；
(2) present invention uses high-precision impedance measurement chip AD5933 and STM32F103, therefore only needs selection suitable
Feedback resistance just can realize high-acruracy survey result with gain factor；
(3) present invention replaces feedback resistance using digital regulation resistance, ensures ± 8% low resistance tolerance error and 4MHz high
Bandwidth realizes automatic range switching function, makes each measurement result all within range or close to full scale.
Description of the drawings
Fig. 1 is solar cell impedance measurement system structure diagram of the embodiment of the present invention.
Fig. 2 is control module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.
Fig. 3 is solar cell impedance measurement system middle impedance measurement module local detail circuit diagram of the embodiment of the present invention.
Fig. 4 is range handover module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.
Fig. 5 is communication module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.
Fig. 6 is power supply module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.
【Main element】
1, control module
2, impedance measurement module
3, range handover module
4, communication module
5, power supply module
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
Certain embodiments of the invention will be done with reference to appended attached drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be shown.In fact, various embodiments of the present invention can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, these embodiments are provided so that the present invention meets applicable legal requirement.
In an exemplary embodiment of the present invention, a kind of solar cell impedance measurement system, solar cell resistance are provided
Anti- measuring system is specific to solar cell design, compensates for the blank of solar cell impedance measurement technique.Fig. 1 is this hair
Bright embodiment solar cell impedance measurement system structure diagram.As shown in Figure 1, solar cell impedance measurement system packet of the present invention
It includes：Control module 1, impedance measurement module 2, range handover module 3, wherein control module 1 is steady between modules for coordinating
Fixed work, control modules complete corresponding function, realize system control and data transmission；Impedance measurement module 2 is used
In carrying out impedance measurement to solar cell, and by data transfer to control module, measurement data is uploaded by control module
To host computer；Range handover module 3 includes a digital regulation resistance, changes digital current potential according to the measurement result of impedance measurement module
The feedback resistance value of device adjusts impedance measurement range in real time, and measurement result is made to remain within range or close to full scale,
To improve measurement accuracy.
Fig. 2 is control module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.Such as Fig. 2 institutes
Show, in one embodiment, control module 1 uses the STM32F103 models of STM32 chip series as the system core, and each
Module is connected, and coordinates steady operation between each module, sends instruction to each peripheral hardware by controlling I2C buses and GPIO mouthfuls, leads to
It crosses USB interface to connect with host computer, realizes the functions such as system control and data transmission.In addition, control module 1 can also connect one
Liquid crystal display shows measurement result.
Fig. 3 is solar cell impedance measurement system middle impedance measurement module local detail circuit diagram of the embodiment of the present invention.Such as
Shown in Fig. 3, impedance measurement module 2 includes impedance measurement chip, external crystal-controlled oscillation one, operational amplifier, divider resistance, is passed through
The I2C buses of STM32F103 transmit instruction and configuration related register to start solar cell impedance survey to impedance measurement chip
Amount.As a kind of specific embodiment, the selection of impedance measurement chip uses AD5933 chips, and those skilled in the art should
Understand, impedance measurement chip is not limited thereto, as long as impedance measurement can be realized.The embodiment of the present invention is using high-precision
Impedance measurement chip AD5933 and STM32F103, therefore only need to select suitable feedback resistance just can be real with gain factor
Existing high-acruracy survey result.
As shown in figure 3, amplitude and the adjustable sinusoidal excitation signal of frequency are exported by the ends VOUT of AD5933, which passes through
Divider resistance encourages solar cell to be measured, signal to become response signal after solar cell, the response with after operational amplifier
Signal is sampled at the ends VIN and the ends RFB by ADC inside AD5933, and pass through after the digital regulation resistance of range handover module 3
Discrete Fourier transform is carried out after low-pass filtering, programme-controlled gain amplification, final calculation result is the impedance real part of solar cell
With imaginary part, measurement data is transmitted to STM32F103 by I2C, is finally uploaded to host computer.
Fig. 4 is range handover module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.Such as
Shown in Fig. 4, the digital regulation resistance of range handover module 3 preferably uses AD5111, and the ends A of AD5111 are connected on respectively with the ends W
The end RFB and VIN of AD5933, to replace the function of feedback resistance, when system starts to measure, STM32F103 is multiple by GPIO mouthfuls
With function control CS, CLK and U/D pin, the ends moving cursor W make the resistance value of digital regulation resistance be minimum value, and each AD5933 is surveyed
Its measurement result is detected after amount whether in range ability or close to full scale, adjusts the ends vernier W according to testing result
Position, to change feedback resistance value, to adjust impedance measurement range in real time.The embodiment of the present invention is replaced using digital regulation resistance
Feedback resistance ensures ± 8% low resistance tolerance error and 4MHz high bandwidths, realizes automatic range switching function, makes every time
Measurement result is all within range or close to full scale.
As shown in figure 4, range handover module 3 further includes two capacitances in parallel, and it is in parallel with digital regulation resistance.
Fig. 5 is communication module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.Such as Fig. 5 institutes
Show, solar cell impedance measurement system further includes communication module 4, is connect with control module 1, communication module 4 include switching chip,
CH340G may be used in external crystal-controlled oscillation two, USB, switching chip, at the same time the function that realization USB turns serial ports passes through
CH340G realizes that a key of STM32F103 downloads the function of program, and realizes that the data between STM32F103 and host computer pass
It is defeated.
Fig. 6 is power supply module local detail circuit diagram in solar cell impedance measurement system of the embodiment of the present invention.Such as Fig. 6 institutes
Show, solar cell impedance measurement system further includes power supply module 5, is powered to solar cell impedance measurement system.Power supply module 5 wraps
Two independent Switching Power Supplies are included, specification is respectively 3.3V 1A and 5.0V 1A, under operating conditions, the switch of 3.3V 1A
Power supply is the power supply of the numerical portions such as STM32F103, AD5933 and AD5111, and the Switching Power Supply of 5V 1A is then other simulation parts
Divide power supply, interfered with each other with analog portion with reducing numerical portion, two power supplys pass through 0 Ohmic resistance and connect ground.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
There should be clear understanding to solar cell impedance measurement system of the present invention.The impedance data measured through the invention can
To draw nyquist diagram and Bode diagram, with for further analysis.The present invention is specific to solar cell design, measures
Precision is high, easy to operate, at low cost, small, low in energy consumption.
It should be noted that in attached drawing or specification text, the realization method for not being painted or describing is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, the above-mentioned definition to each element and method is simultaneously
It is not limited only to various concrete structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can carry out letter to it
It singly changes or replaces.
It should be noted that running through attached drawing, identical element is indicated by same or similar reference numeral.In the following description,
Some specific embodiments are used for description purposes only, and should not be construed to the present invention has any restrictions, and only the present invention is real
Apply the example of example.When that the understanding of the present invention may be caused to cause to obscure, conventional structure or construction will be omitted.It should be noted that figure
In the shape and size of each component do not reflect actual size and ratio, and only illustrate the content of the embodiment of the present invention.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (10)
1. a kind of solar cell impedance measurement system, which is characterized in that including：Control module (1), impedance measurement module (2) and
Range handover module (3), wherein
Control module (1), for coordinating steady operation between modules, control modules complete corresponding function,
Realization system controls and data transmission；
Impedance measurement module (2), for carrying out impedance measurement to solar cell, and by data transfer to control module (1),
Measurement data is uploaded to host computer by control module (1)；
Range handover module (3), including a digital regulation resistance change number electricity according to the measurement result of impedance measurement module (2)
The feedback resistance value of position device, adjusts impedance measurement range in real time, and measurement result is made to remain within range or close to full amount
Journey improves measurement accuracy.
2. solar cell impedance measurement system according to claim 1, which is characterized in that the control module (1) uses
STM32 chips.
3. solar cell impedance measurement system according to claim 1, which is characterized in that the impedance measurement module (2)
Including impedance measurement chip, operational amplifier and divider resistance, wherein
Control module (1) is transmitted to impedance measurement chip and is instructed, and pumping signal is exported by impedance measurement chip, pumping signal warp
Divider resistance is crossed with after operational amplifier, solar cell to be measured, pumping signal is encouraged to become response signal after solar cell,
The response signal is sampled by impedance measurement chip, is obtained by signal processing after the digital regulation resistance of range handover module (3)
To the impedance measurements of solar cell.
4. solar cell impedance measurement system according to claim 3, which is characterized in that the signal processing includes low pass
Filtering, programme-controlled gain amplification and discrete Fourier transform.
5. solar cell impedance measurement system according to claim 3, which is characterized in that impedance measurement chip uses
AD5933 chips.
6. solar cell impedance measurement system according to claim 5, which is characterized in that the model of the digital regulation resistance
For AD5111, there is the ends vernier W, its measurement result is detected after measuring every time whether in range ability or close to completely
Range adjusts the position at the ends vernier W, to change feedback resistance value, to adjust impedance measurement range in real time according to testing result.
7. solar cell impedance measurement system according to claim 6, which is characterized in that the range handover module (3)
Further include two capacitances in parallel, the two capacitances in parallel are in parallel with digital regulation resistance.
8. solar cell impedance measurement system according to claim 1, which is characterized in that the solar cell impedance measurement
System further includes communication module (4), is connect with control module (1), upper for measurement data to be transmitted to by control module (1)
Machine.
9. solar cell impedance measurement system according to claim 8, which is characterized in that the solar cell impedance measurement
System further includes power supply module (5) comprising two independent Switching Power Supplies, the respectively number of solar cell impedance measurement system
Character segment and analog portion power supply, are interfered with each other with reducing numerical portion with analog portion.
10. solar cell impedance measurement system according to claim 1, which is characterized in that the solar cell impedance is surveyed
Amount system further includes a liquid crystal display, for showing measurement result.
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| CN201810345251.1A CN108562795A (en) | 2018-04-17 | 2018-04-17 | A kind of solar cell impedance measurement system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810345251.1A CN108562795A (en) | 2018-04-17 | 2018-04-17 | A kind of solar cell impedance measurement system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856457A (en) * | 2019-02-27 | 2019-06-07 | 福建江夏学院 | A kind of self-adapting load impedance detection system and method |
| CN112327055A (en) * | 2020-11-09 | 2021-02-05 | 爱士惟新能源技术(扬中)有限公司 | Insulation impedance detection circuit and method for photovoltaic inverter |
| CN114859129A (en) * | 2022-07-07 | 2022-08-05 | 武汉地震工程研究院有限公司 | Wireless multi-channel micro impedance measuring method and device |
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| CN107450646A (en) * | 2017-09-30 | 2017-12-08 | 北京东方计量测试研究所 | Solar cell C-V characteristic control circuit |
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| CN102611426A (en) * | 2012-03-23 | 2012-07-25 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
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| CN109856457B (en) * | 2019-02-27 | 2021-06-08 | 福建江夏学院 | Self-adaptive load impedance detection system and method |
| CN112327055A (en) * | 2020-11-09 | 2021-02-05 | 爱士惟新能源技术(扬中)有限公司 | Insulation impedance detection circuit and method for photovoltaic inverter |
| CN114859129A (en) * | 2022-07-07 | 2022-08-05 | 武汉地震工程研究院有限公司 | Wireless multi-channel micro impedance measuring method and device |
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