CN104852685A - Solar power generation system voltage limiting protection sampling circuit - Google Patents
Solar power generation system voltage limiting protection sampling circuit Download PDFInfo
- Publication number
- CN104852685A CN104852685A CN201510216489.0A CN201510216489A CN104852685A CN 104852685 A CN104852685 A CN 104852685A CN 201510216489 A CN201510216489 A CN 201510216489A CN 104852685 A CN104852685 A CN 104852685A
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- resistance
- input
- limiting protection
- photovoltaic cell
- ground connection
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- 238000005070 sampling Methods 0.000 title abstract description 5
- 238000010248 power generation Methods 0.000 title abstract 3
- 230000001681 protective effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 7
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 description 10
- 101150102866 adc1 gene Proteins 0.000 description 10
- 238000005259 measurement Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
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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
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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
- 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
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- Photovoltaic Devices (AREA)
Abstract
A solar power generation system voltage limiting protection sampling circuit comprises an operational amplifier, a slide rheostat, a resistor R5, a resistor R7, a resistor R8, and two ADC converters. The negative electrode of a photovoltaic cell is grounded through a resistor R6, and the positive electrode of the photovoltaic cell is connected with an input power supply Vo. After the slide rheostat and the resistor R5 are connected in series, the slide rheostat is connected with the positive electrode of the photovoltaic cell, and the resistor R5 is grounded. The in-phase input end of the operational amplifier is connected with the negative electrode of the photovoltaic cell, the reversed-phase input end of the operational amplifier is grounded through the resistor R7, and the output end of the operational amplifier is connected with the input end of one ADC converter. The resistor R8 is connected between the output end and the reversed-phase input end of the operational amplifier. The input end of the other ADC converter is connected between the resistor R5 and the slide rheostat. A clamping protection circuit used for offering voltage limiting protection to input signals is arranged at the input end of each ADC converter. The solar power generation system voltage limiting protection sampling circuit of the invention is simple in structure, can cooperate with a single chip microcomputer, can realize cell current and voltage sampling simply and conveniently, and is low in cost.
Description
Technical field
The present invention relates to sample circuit field, particularly, relate to a kind of solar power system voltage-limiting protection type sample circuit.
Background technology
Photovoltaic cell (being also PV battery) is the abbreviation of solar-energy photo-voltaic cell, and it is the device directly light energy conversion being become electric energy by photoelectric effect or Photochemical effects.
Direct current-the voltage (I-V) of PV battery is measured and DC I-V curve chart can be utilized to evaluate and test PV battery, the functional relation of the electric current that I-V curve chart ordinary representation solar cell produces and voltage.The maximum power (PMAX) that battery can produce appears at maximum current (IMAX) and voltage (VMAX) point, the peak power output that under the different voltage of the cartographic represenation of area below curve, battery can produce.Generate this I-V curve chart to need to sample to photovoltaic cell, with Measurement accuracy electric current and voltage.
In solar power system, the survey tool (such as ampere meter and voltage source) that general is special, or the instrument (such as digital sourcemeter or source measuring unit) being integrated with power supply and measurement function, generate this I-V curve chart.In order to adapt to the demand of this kind of application, testing equipment must PV battery measurement can range ability in provide voltage source and Absorption Current, meanwhile, provide analytic function with Measurement accuracy electric current and voltage, use equipment more, cost is higher.
Summary of the invention
Object of the present invention is just the shortcoming and defect overcoming above-mentioned prior art; the solar power system voltage-limiting protection type sample circuit that a kind of structure is simple, easy to use, cost is low is provided; this sample circuit is also provided with clamping protective circuit, can also provide voltage-limiting protection to sample circuit.
The present invention's adopted technical scheme that solves the problem is:
Solar power system voltage-limiting protection type sample circuit, comprises photovoltaic cell, operational amplifier F, slide rheostat R4, resistance R5, resistance R6, resistance R7, resistance R8, two ADC transducers; The negative pole of photovoltaic cell connects input power Vo by resistance R6 ground connection, positive pole; After slide rheostat R4 and resistance R5 connect, slide rheostat R4 is connected the positive pole of photovoltaic cell, resistance R5 ground connection; The in-phase input end of described operational amplifier F connects the negative pole of photovoltaic cell, and inverting input is by resistance R7 ground connection, and output is connected with the input of an ADC transducer; Between the output that described resistance R8 is connected to operational amplifier F and inverting input; The input of another ADC transducer is connected between resistance R5 and slide rheostat R4; The input of described ADC transducer is also provided with the clamping protective circuit of input signal being carried out to voltage-limiting protection.
As a further improvement on the present invention, described clamping protective circuit is made up of 2 diodes, and a diode cathode connects input, the negative pole connection power vd D of ADC transducer, and another diode cathode ground connection, negative pole connect the input of ADC transducer.
As another improvement of the present invention, above-mentioned solar power system voltage-limiting protection type sample circuit also comprises filter capacitor C2, and filter capacitor C2 one end connects input power Vo, other end ground connection.
Preferably, the resistance of described resistance R6 is 0.1 Ω.
One improve again as of the present invention, above-mentioned solar power system voltage-limiting protection type sample circuit also comprises two low-pass filter circuits, first low-pass filter circuit is made up of resistance R1 and electric capacity C1, the output of one end concatenation operation amplifier F of resistance R1, one end ground connection of electric capacity C1, the other end of resistance R1 is all connected the input of an ADC transducer with the other end of electric capacity C1; Second low-pass filter circuit is made up of resistance R2 and electric capacity C3, one end of resistance R2 is connected between resistance R5 and slide rheostat R4, one end ground connection of electric capacity C3, the other end of resistance R2 is all connected the input of another ADC transducer with the other end of electric capacity C3.
To sum up, the invention has the beneficial effects as follows:
The circuit structure of sample circuit of the present invention is simple, can coordinate, realize electric current and the voltage sample of photovoltaic cell simply, easily with single-chip microcomputer, and without the need to using other transducer and complicated equipment, cost is low; Sample circuit of the present invention is also provided with clamping protective circuit, can also provide voltage-limiting protection to the ADC transducer of sample circuit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, solar power system voltage-limiting protection type sample circuit, comprises photovoltaic cell, operational amplifier F, slide rheostat R4, resistance R5, resistance R6, resistance R7, resistance R8, an ADC transducer ADC0, the 2nd ADC transducer ADC1, filter capacitor C2; The negative pole of photovoltaic cell connects input power Vo by resistance R6 ground connection, positive pole; After slide rheostat R4 and resistance R5 connect, slide rheostat R4 is connected the positive pole of photovoltaic cell, resistance R5 ground connection; The in-phase input end of described operational amplifier F connects the negative pole of photovoltaic cell, and inverting input is by resistance R7 ground connection, and output is connected with the input of an ADC transducer ADC0, and power end connects+5V DC power supply, earth terminal ground connection; Between the output that described resistance R8 is connected to operational amplifier F and inverting input; The input of the 2nd ADC transducer ADC1 is connected between resistance R5 and slide rheostat R4; Filter capacitor C2 one end connects input power Vo, other end ground connection.Two ADC transducers (an ADC transducer ADC0, the 2nd ADC transducer ADC1) are the analog-to-digital analog to digital converter for data, one ADC transducer ADC0, the 2nd ADC transducer ADC1 all have power end and earth terminal, and its power end connects power vd D, earth terminal ground connection.Input power Vo, from external circuit, can be used for charging to photovoltaic cell.
Wafer damage is caused in order to the voltage preventing from entering two ADC transducers is excessive; also utilize clamper to protect diode to carry out voltage-limiting protection in the present embodiment, respectively the clamping protective circuit of input signal being carried out to voltage-limiting protection is set at the input of an ADC transducer ADC0, the 2nd ADC transducer ADC1.
The clamping protective circuit of the one ADC transducer ADC0 is made up of diode D1 and diode D2; diode D2 positive pole connects input, the negative pole connection power vd D of an ADC transducer ADC0, and diode D1 plus earth, negative pole connect the input of an ADC transducer ADC0.
The clamping protective circuit of the 2nd ADC transducer ADC1 is made up of diode D3 and diode D4; diode D4 positive pole connects input, the negative pole connection power vd D of the 2nd ADC transducer ADC1, and diode D3 plus earth, negative pole connect the input of the 2nd ADC transducer ADC1.
To the current sample of photovoltaic cell not additional sensor in the present invention, after the current conversion flowing through photovoltaic cell being become voltage by 1 sensing resistor R6, then carry out ADC conversion sampling.Voltage sample directly by changing the size of slide rheostat R4, makes output voltage at rated range, then be sent to ADC transducer carry out data transaction.Sample circuit of the present invention can coordinate with single-chip microcomputer, realizes electric current and the voltage sample of photovoltaic cell simply, easily, and circuit structure is simple, cost is low.
Because the electric current flowing through photovoltaic cell very greatly (more than 1A), if resistance R6 obtains comparatively large, so may will produce larger voltage drop, the power of consumption is too large, will produce more heat.Make R6=0.1 Ω in the present invention, be sent to again in ADC transducer after voltage amplification with LM358 operational amplifier.
In the present embodiment, the capacitance of described filter capacitor C2 is 200 μ F.
Embodiment 2:
On the basis of embodiment 1, in order to suppress to seal in the interference on ADC converter input signal, also carry out RC low-pass filtering, at the input money of two ADC transducers, two low-pass filter circuits are set, first low-pass filter circuit is made up of resistance R1 and electric capacity C1, the output of one end concatenation operation amplifier F of resistance R1, the other end connect the input of an ADC transducer ADC0, one end ground connection of electric capacity C1, and the other end connects the input of an ADC transducer ADC0; Second low-pass filter circuit is made up of resistance R2 and electric capacity C3, the input that one end of resistance R2 is connected between resistance R5 and slide rheostat R4, the other end connects the 2nd ADC transducer ADC1, electric capacity C3 one end ground connection, the other end connect the input of the 2nd ADC transducer ADC1.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (5)
1. solar power system voltage-limiting protection type sample circuit, is characterized in that, comprises photovoltaic cell, operational amplifier F, slide rheostat R4, resistance R5, resistance R6, resistance R7, resistance R8, two ADC transducers; The negative pole of photovoltaic cell connects input power Vo by resistance R6 ground connection, positive pole; After slide rheostat R4 and resistance R5 connect, slide rheostat R4 is connected the positive pole of photovoltaic cell, resistance R5 ground connection; The in-phase input end of described operational amplifier F connects the negative pole of photovoltaic cell, and inverting input is by resistance R7 ground connection, and output is connected with the input of an ADC transducer; Between the output that described resistance R8 is connected to operational amplifier F and inverting input; The input of another ADC transducer is connected between resistance R5 and slide rheostat R4; The input of described ADC transducer is also provided with the clamping protective circuit of input signal being carried out to voltage-limiting protection.
2. solar power system voltage-limiting protection type sample circuit according to claim 1; it is characterized in that; described clamping protective circuit is made up of 2 diodes; a diode cathode connects input, the negative pole connection power vd D of ADC transducer, and another diode cathode ground connection, negative pole connect the input of ADC transducer.
3. solar power system voltage-limiting protection type sample circuit according to claim 1, is characterized in that, also comprise filter capacitor C2, and filter capacitor C2 one end connects input power Vo, other end ground connection.
4., according to the arbitrary described solar power system voltage-limiting protection type sample circuit of claims 1 to 3, it is characterized in that, the resistance of described resistance R6 is 0.1 Ω.
5. according to the arbitrary described solar power system voltage-limiting protection type sample circuit of claims 1 to 3, it is characterized in that, also comprise two low-pass filter circuits, first low-pass filter circuit is made up of resistance R1 and electric capacity C1, the output of one end concatenation operation amplifier F of resistance R1, one end ground connection of electric capacity C1, the other end of resistance R1 is all connected the input of an ADC transducer with the other end of electric capacity C1; Second low-pass filter circuit is made up of resistance R2 and electric capacity C3, one end of resistance R2 is connected between resistance R5 and slide rheostat R4, one end ground connection of electric capacity C3, the other end of resistance R2 is all connected the input of another ADC transducer with the other end of electric capacity C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510216489.0A CN104852685A (en) | 2015-04-30 | 2015-04-30 | Solar power generation system voltage limiting protection sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510216489.0A CN104852685A (en) | 2015-04-30 | 2015-04-30 | Solar power generation system voltage limiting protection sampling circuit |
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| CN104852685A true CN104852685A (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510216489.0A Pending CN104852685A (en) | 2015-04-30 | 2015-04-30 | Solar power generation system voltage limiting protection sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374834A (en) * | 2016-08-22 | 2017-02-01 | 北京东方计量测试研究所 | Voltage-ampere characteristic measurement circuit and method of solar cell |
-
2015
- 2015-04-30 CN CN201510216489.0A patent/CN104852685A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374834A (en) * | 2016-08-22 | 2017-02-01 | 北京东方计量测试研究所 | Voltage-ampere characteristic measurement circuit and method of solar cell |
| CN106374834B (en) * | 2016-08-22 | 2018-10-09 | 北京东方计量测试研究所 | A kind of solar cell voltammetric characteristic measuring circuit and method |
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Application publication date: 20150819 |