CN106374834B - A kind of solar cell voltammetric characteristic measuring circuit and method - Google Patents
A kind of solar cell voltammetric characteristic measuring circuit and method Download PDFInfo
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- 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
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- 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
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Abstract
The invention discloses a kind of solar cell voltammetric characteristic measuring circuits, including power supply VCC, tested solar cell Vc, load resistance RL, current diverter resistance RsAnd reference potential end VSS, it is characterised in that：Load resistance RLIt is the conducting resistance between the drain D of field-effect tube and source S, the output voltage terminal of the grid G connection feedback amplifier A1 of the field-effect tube, the drain D pole of field-effect tube is connected to the in-phase end of voltage follower A2, and voltage follower A2 output voltage terminals connect the reference voltage pin V of multiplying-type D/AREF, the output voltage pin V of multiplying-type D/AOUTConnect the in-phase end of feedback amplifier A1, the source S of the reverse side connection field-effect tube of feedback amplifier A1, current diverter resistance RsIt is connected on field-effect tube source S and reference potential end VSSBetween, the digital input end of multiplying-type D/A connects number bus.
Description
Technical field
The present invention relates to solar cell voltammetric characteristic measuring method and circuits.More particularly to it is a kind of based on program-controlled load electricity
The solar cell voltammetric characteristic measuring method and circuit of resistance
Background technology
Solar cell varies continuously to the mistake for the short-circuit condition that resistance value is zero in load resistance from infinitely great open-circuit condition
A pair of of data of Cheng Zhong, both end voltage V and conducting electric current I are known as C-V characteristic, using voltage and current as the flat of reference axis
The V-I curves drawn on face are known as VA characteristic curve.
VA characteristic curve is the important parameter of solar cell, can reflect its all electrical parameter and power output and matter
Flow characteristic.General measure C-V characteristic needs transformable load resistance or load current.For cancellation current current divider and lead
Line resistance influences short circuit condition, generally requires and seals in external power supply.Measurement method as voltage and current is typically all logical
The implementation method of voltage amplifier and voltmeter, the method for current diverter and voltage table pack, voltmeter is generally all adopted
Use modulus converter A/D.
Coltfoal, the paper of Zheng Jianbang, Liu Defeng is appointed " to be based on sound card in college of science of Northwestern Polytechnical University optical information technology laboratory
With the solar cell C-V characteristic Auto-Test System of MATLAB ",《Sensing technology journal》In April, 2006.Give one kind too
Positive electricity pond C-V characteristic test circuit, such as Fig. 1.The electric current of solar cell can pass through feedback resistance RfIt is converted into voltage VI, slip change
Solar cell voltage can gradually be adjusted correcting biasing by resistance device centre tap by negative bias, and the battery on floating ground provides positive negative bias
Required voltage.In the circuit, slide wire resistor is the technical characteristics for changing load current.The disadvantage is that load resistance
Variation cannot achieve program control, and the power supply on floating ground is needed to provide bias voltage.
HeFei University of Technology Peng Kai Master's thesis in 2007《Solar cell array property on-spot test equipment research》It proposes
The measurement method of dynamic capacity charge and discharge electric loading.See Fig. 2.It is load with capacitance in the circuit, utilizes electricity during capacitor charging
The changing rule of stream and voltage realizes the variation of solar cell load voltage and electric current.The disadvantage is that operating point is unable to control
Stable state.
The He Yufeng of Hefei Inst. of Plasma Physics, Chinese Academy of Sciences, Weng Jian, Chen Shuanhong, Dai Songyuan publish thesis " multichannel
DSCs C-V characteristics test the development and analysis of system "《Solar energy journal》2 months 2006.See Fig. 3.The circuit key technology is
Precision constant current source, the electric current for flowing through solar cell is arranged in it, then surveys the voltage at battery both ends, and precision constant current source uses current distributing
Device resistance R*, feedback amplifier form negative feedback control input voltage U* and by control electric current I, meet I=U*/R* conditions,
Realize feedback equalization.The disadvantage is that after solar cell C-V characteristic enters constant current curve regions, constant-current source can not set voltage
Operating point.
Any of the above method, there is shortcoming：1, slide-wire rheostat cannot achieve program-controlled；2, load capacitance can not be stablized
In setting operating point；3, Method of constant flow source is only effective in the areas of permanent pressure of VA characteristic curve, and voltage can not be set in constant current area.For reality
The accurate setting of the operating point of constant pressure source region and constant current source region on existing solar cell VA characteristic curve, need to load resistance into
The precise and stable control of row.
Invention content
The present invention is in view of the above-mentioned problems, propose a kind of new scheme, and specifically the present invention provides a kind of sun electricity
Pond voltammetric characteristic measuring circuit and method, including power supply VCC, tested solar cell Vc, load resistance RL, current diverter resistance
RsAnd reference potential end VSS, it is characterised in that：Load resistance RLIt is the electric conduction between the drain D of field-effect tube and source S
Resistance, the output voltage terminal of the grid G connection feedback amplifier A1 of the field-effect tube, the drain D pole of field-effect tube is connected to electricity
The in-phase end of follower A2, the reference voltage of voltage follower A2 output voltage terminals connection multiplying-type digital analog converter D/A is pressed to draw
Foot VREF, the output voltage pin V of multiplying-type digital analog converter D/AOUTConnect the in-phase end of feedback amplifier A1, feedback amplifier
The source S of the reverse side connection field-effect tube of A1, current diverter resistance RsIt is connected on field-effect tube source S and reference potential end
VSSBetween, the digital input end of multiplying-type digital analog converter D/A connects number bus.
Further, it is characterised in that：Further include being arranged in power supply VCC andTested solar cell VcBetween protective resistance RA
And first switch and lead resistance Rp1, second switch and lead resistance Rp2It is at least one.
Further, it is characterised in that：Tested solar cell VcThere are 4 conducting wires, one pair of which positive and negative polarity wire is for leading
Galvanization, another pair positive and negative polarity wire connects the voltmeter or differential voltage amplifier of high input impedance, for measuring voltage；
Current diverter resistance has 4 conducting wires, one pair of which positive and negative polarity wire to be used for conducting electric current, the connection of another pair positive and negative polarity wire
The voltmeter or differential voltage amplifier of high input impedance, for measuring electric current.
Further, it is characterised in that：It is provided between the drain D and the in-phase end of voltage follower A2 of field-effect tube low
Bandpass filter, it is preferable that the low-pass filter includes resistance RfWith capacitance Cf。
Further, it is characterised in that：Further include two sampling holders, solar cell voltage and current can be sampled simultaneously
Then the voltage of current divider resistance can be distinguished or timesharing measures two kinds of voltage values.
Further, it is characterised in that：A pair of of positive and negative polarity wire connection voltage differential of the tested solar cell Vc is put
A pair of of input terminal of big device A3, the input terminal of one sampling holder SH1 of output connection of voltage differential discharger A3, using guarantor
The output end of holder SH1 connects modulus converter A/D, and a pair of of positive and negative polarity wire of current diverter resistance Rs connects voltage differential
The output end of a pair of of input terminal of amplifier A4, voltage differential discharger A4 connects the input terminal of another sampling holder SH2,
The output end of another sampling holder SH2 connects above-mentioned modulus converter A/D, and two sampling holders SH1's and SH2 adopts
Sample/holding enables pin and connects together a shared trigger signal, by Digital Circuit Control.
Further, it is characterised in that：The digital quantity DD controllable load resistance values R of multiplying-type digital analog converter D/AL=
Rs(1/DD-1) digital quantity DD.
Further, it is characterised in that：The value range of the digital quantity DD of multiplying-type D/A is 0≤DD<1, using binary system
Fractional representation digital quantity DD, then it is as follows for the expression formula of N D/A：
DD=(aN-12N-1+aN-22N-2+···+a121+a020)/2N
Wherein：aN-1, aN-2, a1, a0Value is 0 or 1.
Further, it is characterised in that：The load resistance R of constant current source regionLMeet following formula：
RL<(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)
The load resistance R of constant pressure source regionLFollowing formula should be met：
RL>(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)。
Wherein：Voc, IscThe estimated value of the open-circuit voltage and circuital current of respectively tested solar cell.
The circuit and measurement method of the present invention can be used for the quick measurement of multichannel solar cell C-V characteristic, with program
Control does not need more convenient in the measurement that personnel operate.Improve supply voltage VCCThe limit to switch and conductor resistance can be relaxed
The larger analog switch of conducting resistance or solid-state relay can be selected in system.It calculates, can incite somebody to action by work range selection and load resistance
The operating point of solar cell is accurate and steadily controls in required voltage and Current Position.The design of program-controlled load resistance
It can also be used in the load resistance control circuit that other need more high current with calculating, as high-power resistance and diode volt-ampere are special
Property measure and battery or DC power supply voltammetric characteristic measuring etc..
Description of the drawings
Fig. 1 is the circuit diagram of the prior art 1.
Fig. 2 is the circuit diagram of the prior art 2.
Fig. 3 is the circuit diagram of the prior art 3.
Fig. 4 is measuring circuit figure of the present invention.
Fig. 5 is solar cell voltammetric characteristic measuring simplified electrical circuit diagram of the present invention.
Fig. 6 is the volt-ampere characteristics of figure of all-in resistance in measuring circuit of the present invention.
Fig. 7 is solar cell V-I characteristic curves of the present invention and all-in resistance relationship.
Fig. 8 is that low-pass filter of the present invention eliminates feedback self-oscilation oscillating circuit.
Fig. 9 is that voltage and current sampling keeps synchronous trigger circuit in the present invention.
Specific implementation mode
Below by way of specific implementation case come the realization method for introducing the present invention and specific effect.
Referring to Fig. 4, the measuring circuit of C-V characteristic of the invention includes power supply VCC, protective resistance RA, first switch and draw
Line resistance Rp1, tested solar cell Vc, second switch and lead resistance Rp2, load resistance RL, current diverter resistance RsAnd
Reference potential end VSS。
Wherein load resistance RLIt is the conducting resistance controlled by the grid G of field-effect tube, i.e., between drain D and source S
Resistance RL.The grid G of field-effect tube passes through protective resistance RGConnect the output voltage terminal of feedback amplifier A1.The leakage of field-effect tube
Pole D is connected to the in-phase end of voltage follower A2.A2 output voltage terminals connect the reference voltage pin V of multiplying-type D/AREF.Multiplication
The output voltage pin V of type D/AOUTConnect the in-phase end of feedback amplifier A1.The source S of the reverse side connection field-effect tube of A1.
Current diverter resistance RsIt is connected on field-effect tube source S and reference potential end VSSBetween.VSSCan also be one end of power supply,
It can be ground potential.The digital input end of multiplying-type D/A connects number bus, can be that serial digital input or Parallel Digital are defeated
Enter.Digital quantity DD is by program setting.
Tested solar cell has 4 conducting wires, one pair of which positive and negative polarity wire to be used for conducting electric current, and another pair positive and negative anodes are led
Line connects the voltmeter or differential voltage amplifier of high input impedance, for measuring voltage.Current diverter resistance RsThere are 4 to lead
Line, one pair of which positive and negative polarity wire be used for conducting electric current, another pair positive and negative polarity wire connect high input impedance voltmeter or
Differential voltage amplifier, for measuring electric current.Illustrate load resistance R of the present invention belowLThe principle and mode accurately controlled, tool
For body, as shown in figure 4, the load resistance R of field-effect tubeLFor：
RL=(VR-V1)/Ic=(VR-V1)/(V1/Rs)=Rs(VR-V1)/V1
When negative-feedback reaches equilibrium state in circuit, the in-phase end and reverse phase terminal voltage of feedback amplifier A1 is equal, makes field
The current potential V of effect pipe source S1, with multiplying-type D/A output current potentials VoutIt is equal, i.e. V1=Vout；Voltage follower A2 makes field-effect
The current potential V of pipe drain DR, with multiplying-type D/A reference voltage terminal potentials VrefIt is equal, i.e. VR=Vref, it is assumed that reference potential end VSS=
0, then the load resistance R of field-effect tubeLFor：
I.e.：RL=Rs(Vref-Vout)/Vout
By the output voltage V of multiplying-type D/AoutAnd reference voltage VrefRelationship：Vout=DD*Vref, substitute into above formula：
RL=Rs(Vref-Vout)/Vout=Rs(Vref/Vout- 1)=Rs(1/DD-1)
DD=1/ (RL/Rs+1)
The value range of wherein digital quantity DD is 0≤DD<1, digital quantity DD is binary fraction, the expression for N D/A
Formula is as follows：
DD=(aN-12N-1+aN-22N-2+···+a121+a020)/2N
Wherein：aN-1, aN-2, a1, a0Value is 0 or 1.
Such as：12bit multiplying-type D/A：
Assuming that DD=1000 0000 0000B, DD=2048/4096=0.5, then R is arranged in D/AL=Rs(1/0.5-1)=
Rs；
Assuming that D/A setting DD=0100 0000 0000B, DD=1024/4096=1/4, RL=Rs(4-1)=3Rs；
Assuming that D/A setting DD=0000 0000 0001B, DD=1/4096, RL=Rs(4096-1)=4095Rs；
Assuming that D/A setting DD=1111 1111 1111B, DD=4095/4096, RL=Rs(4096/4095-1)=(1/
4095)Rs；
As it can be seen that can realize load resistance R by the setting to DDLAccurately control.
Illustrate load resistance R of the present invention belowLNumerical value determine method：
Electric current I in measuring circuitcFrom power supply VCCOutflow, by protective resistance RA, tested solar cell Vc, switch and draw
Line resistance Rp1、Rp2, field-effect tube RLWith current divider resistance Rs, finally from reference potential end VSSFlow back to power supply.Due to solar cell
VcWith current divider resistance RsVoltage measurement branch into high input impedance, and between fet gate G and source S, drain D
All it is high value resistor, is nearly free from branch current, and influence of leakage current is ignored, electric current IcThe phase everywhere on measuring branch road
Deng.Simplify circuit diagram and see Fig. 5, that is, meets Kirchhoff's second law：
Ic(RA+Rp1+Rp2+RL+Rs)=VCC-VSS+Vc=U
Using voltage as the longitudinal axis, electric current is horizontal axis, then voltage U=V in Fig. 5CC-VSS+VcWith electric current IcC-V characteristic be electricity
The linear characteristic of resistance, the OA straight lines as crossed origin in Fig. 6.
When field-effect tube is fully on, fully on resistance RonIt is close to zero, load resistance RL=RonWhen, it is total in circuit
Resistance value is minimum, and straight line OA slopes are minimum：
RA+Rp1+Rp2+Ron+Rs=(VCC-VSS)/Imax
Then：
Imax=(VCC-VSS)/(RA+Rp1+Rp2+Ron+Rs)
ImaxIt is the short circuit current maximum range of the measuring circuit, can be obtained by above formula known resistance and voltage parameter calculating
.
When field-effect tube is not exclusively connected, the C-V characteristic of all-in resistance is OA ' in circuit, is arrived in the longitudinal axis by origin
Straight line between OA.Load resistance RLBigger, OA ' straight slopes are bigger, when for ∞, overlapped with the longitudinal axis.
The VA characteristic curve such as the bending thick line portion in Fig. 7, dotted portion of tested solar cell are limited by all-in resistance
It cannot set, working point of solar array parameter (Vc,Ic) and RLFunctional relation be：
RL=(Vc+VCC-VSS)/Ic-(RA+RP1+RP2+Rs)
Operating point parameter (V on the right of above formula equal signc,Ic) it is setting value, other parameters are circuit known parameters.
Assuming that the open-circuit voltage of tested solar cell is Voc, short circuit current Isc, then the load of constant current source region is electric in Fig. 7
Hinder RLFollowing formula should be met：
RL<(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)
The load resistance R of constant pressure source region in Fig. 7LFollowing formula should be met：
RL>(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)
In this way, according to the parameters of circuit, load resistance R can be learntLValue range selectes digital quantity according to the value
The value of DD, is then set, so that it may to accurately control load resistance RLValue.
As shown in figure 4, field-effect tube, current diverter resistance R in circuit of the present inventions, feedback amplifier A1, voltage follow
Device A2, multiplying-type D/A etc. constitute a feedback control loop.If loop circuit impedance makes 180 ° of reverse-phase on some frequency point, very
It is easy to form the self-oscillation of positive feedback.It is therefore preferable that in scheme, as shown in figure 8, sealing in low-pass filtering in the feedback loop
Device limits the feedback of high-frequency signal.Specially resistance R is devised between scene effect pipe drain D and voltage follower A2fAnd electricity
Hold CfThe low-pass filter of composition, time constant are τ=1/RfCf.Measurement interval between preferably two operating points should be greater than 5
τ, such operating point are more stable.
Power supply VCCRipple and other interference, be easy by cause voltage, electric current it is unstable.Load resistance is in feedback equalization
In the process, because time constant is larger, also voltage, electric current can be made slowly varying.Since the voltage and current of solar cell is complete
Relevant a pair of parameter, as long as they are sampled simultaneously, will not influence the accurate of the expression of C-V characteristic even if they change
Property, only there is deviation in operating point.Therefore, in preferred scheme, see Fig. 9, the measurement in order to ensure voltage and current is same
Shi Xing has used two sampling holders sampled voltage and electric current simultaneously, and when measuring some operating point, trigger signal makes two
A sampling holder is kept simultaneously, then distinguishes or timesharing measures two kinds of voltage values, you can solve the shadow of the above destabilizing factor
It rings.In Fig. 9, it is tested solar cell VcA pair of of positive and negative polarity wire connection voltage difference amplifier A3 a pair of of input terminal, A3's
The input terminal of one sampling holder SH1 of output connection, the output end of SH1 connect modulus converter A/D, current diverter resistance
RsA pair of of positive and negative polarity wire connection voltage difference amplifier A4 a pair of of input terminal, the output end of A4 connects another sampling and protects
The output end of the input terminal of holder SH2, SH2 connects modulus converter A/D.Sampling/guarantor of two sampling holders SH1 and SH2
It holds enabled pin to connect together a shared trigger signal, by Digital Circuit Control.
In the circuit of Fig. 4, some elements are arranged to realize better effect, such as protective resistance RA, RG,
Switch and conductor resistance Rp1, Rp2Deng.It should be known that when realizing general object of the present invention, above-mentioned component is all optional, side
There is Vcc, Vss, solar cell Vc, field-effect tube R in caseL, current diverter Rs, voltage follower A2, feedback amplifier A1,
Multiplying-type D/A these.
With reference to specific embodiment, to illustrate the course of work of circuit of the present invention.
Circuit parameter design is exemplified below：
Measure the electric current I of branch roadcFrom power supply VCCOutflow, by protective resistance RA, tested solar cell Vc, switch and draw
Line resistance Rp1、Rp2, field-effect tube RLWith current divider resistance Rs, finally from reference potential end VSSFlow back to power supply.
1) current measuring range I is setmax=150mA, reference potential end VSS=0V, power supply VCC=5V overall line resistances are answered small
In：
RA+Rp1+Rp2+Ron+Rs=(VCC-VSS)/Imax=33.33 Ω
Citing design is allocated as follows：Protective resistance RA=5 Ω, switch and lead resistance Rp1=11.5 Ω, Rp2=11.5 Ω,
Current diverter resistance Rs=5 Ω, the fully on resistance R of field-effect tubeon=0.33 Ω.It is constant in short circuit current measurement range
Under constraints, if switch and lead resistance are smaller, it is possible to increase protective resistance.If switch and lead resistance is larger or field-effect
It is larger to manage fully on resistance, protective resistance can be reduced or increases Vcc voltage.
2) estimate that it is V to be tested solar batteriesoc=0.7V, short circuit current Isc=0.12A,
In constant current source region, load resistance setting：
RL<(5V+0.7V)/0.12A-(RA+Rp1+Rp2+Ron+RsThe Ω of Ω -33.33 Ω=14.17 of)=47.5
Corresponding multiplying-type D/A digital quantities are DD=1/ (RL/Rs+1)>1/ (14.17/5+1)=0.2608；
Digital quantity DD=1~(1068/4096) if using 12bitD/A, hexadecimal are (082CH~0FFFH)
In constant pressure source region, load resistance setting：
RL>(5V+0.7V)/0.12A-(RA+Rp1+Rp2+Ron+RsThe Ω of Ω -33.33 Ω=14.17 of)=47.5
Corresponding multiplying-type D/A digital quantities are DD=1/ (RL/Rs+1)<1/ (14.17/5+1)=0.2608；
(1068/4096)~1 digital quantity DD=if using 12bitD/A, binary system are (0000H~082CH)
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (11)
1. a kind of solar cell voltammetric characteristic measuring circuit, including power supply VCC, tested solar cell Vc, load resistance RL, electric current point
Flow device resistance RsAnd reference potential end VSS, wherein power supply VCCConnection is tested solar cell VcOne end is tested solar cell Vc
The other end connection field-effect tube drain electrode, it is characterised in that：Load resistance RLIt is between the drain D of field-effect tube and source S
Conducting resistance, the output voltage terminal of the grid G connection feedback amplifier A1 of the field-effect tube, the drain D pole of field-effect tube
It is connected to the in-phase end of voltage follower A2, voltage follower A2 output voltage terminals connect the base of multiplying-type digital analog converter D/A
Quasi- voltage pin VREF, the output voltage pin V of multiplying-type digital analog converter D/AOUTThe in-phase end of feedback amplifier A1 is connected, instead
Present the source S of the reverse side connection field-effect tube of amplifier A1, current diverter resistance RsIt is connected on field-effect tube source S and ginseng
Examine potential end VSSBetween, the digital input end of multiplying-type digital analog converter D/A connects number bus.
2. measuring circuit according to claim 1, it is characterised in that：Further include being arranged in power supply VCCWith tested solar cell
VcBetween protective resistance RAAnd first switch and lead resistance Rp1, and be arranged in tested solar cell VcWith field-effect tube
Second switch between drain electrode and lead resistance Rp2。
3. measuring circuit according to claim 1, it is characterised in that：Tested solar cell VcThere are 4 conducting wires, one pair of which
Positive and negative polarity wire is used for conducting electric current, and another pair positive and negative polarity wire connects voltmeter or the differential voltage amplification of high input impedance
Device, for measuring voltage；Current diverter resistance has 4 conducting wires, and one pair of which positive and negative polarity wire is used for conducting electric current, and in addition one
The voltmeter or differential voltage amplifier that high input impedance is connected to positive and negative polarity wire, for measuring electric current.
4. measuring circuit according to claim 1, it is characterised in that：The drain D of field-effect tube is with voltage follower A2's
Low-pass filter is provided between in-phase end.
5. measuring circuit according to claim 4, it is characterised in that：The low-pass filter includes resistance RfWith capacitance Cf。
6. measuring circuit according to claim 1, it is characterised in that：Further include two sampling holders, can sample simultaneously
Then the voltage of solar cell voltage and current current divider resistance can be distinguished or timesharing measures two kinds of voltage values.
7. measuring circuit according to claim 1, it is characterised in that：A pair of of positive and negative anodes of the tested solar cell Vc are led
Line connects a pair of of input terminal of voltage difference amplifier A3, and the output of voltage differential discharger A3 connects a sampling holder
The input terminal of SH1 connects modulus converter A/D using the output end of retainer SH1, and a pair of current diverter resistance Rs is positive and negative
Polar conductor connects a pair of of input terminal of voltage difference amplifier A4, and the output end of voltage differential discharger A4 connects another sampling
The output end of the input terminal of retainer SH2, another sampling holder SH2 connects above-mentioned modulus converter A/D, and two samplings are protected
Sampling/holding of holder SH1 and SH2 enables pin and connects together a shared trigger signal, by Digital Circuit Control.
8. measuring circuit according to claim 1, it is characterised in that：The digital quantity DD of multiplying-type digital analog converter D/A can
Control load resistor value RL=Rs(1/DD‐1)。
9. measuring circuit according to claim 7, it is characterised in that：The digital quantity DD's of multiplying-type digital analog converter D/A
Value range is 0≤DD<1, digital quantity DD is indicated using binary fraction, then it is as follows for the expression formula of N DD：
DD=(aN-12N-1+aN-22N-2+…+a121+a020)/2N
Wherein：aN-1, aN-2... a1, a0Value is 0 or 1.
10. measuring circuit according to claim 2, it is characterised in that：The load resistance R of constant current source regionLMeet following formula：
RL<(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)
The load resistance R of constant pressure source regionLFollowing formula should be met：
RL>(Voc+VCC-VSS)/Isc-(RA+RP1+RP2+Rs)
Wherein：Voc, IscThe estimated value of the open-circuit voltage and short circuit current of respectively tested solar cell.
11. a kind of solar cell voltammetric characteristic measuring method, it is characterised in that：Using claim 1-10 any one of them electricity
Road measures.
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| CN201392382Y (en) * | 2009-04-30 | 2010-01-27 | 于培诺 | Generating energy testing instrument of solar cell component |
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| CN104852685A (en) * | 2015-04-30 | 2015-08-19 | 成都锐奕信息技术有限公司 | Solar power generation system voltage limiting protection sampling circuit |
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