CN204633326U - There is the photovoltaic cell sample circuit of voltage-limiting protection function - Google Patents
There is the photovoltaic cell sample circuit of voltage-limiting protection function Download PDFInfo
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- CN204633326U CN204633326U CN201520275085.4U CN201520275085U CN204633326U CN 204633326 U CN204633326 U CN 204633326U CN 201520275085 U CN201520275085 U CN 201520275085U CN 204633326 U CN204633326 U CN 204633326U
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Abstract
There is the photovoltaic cell sample circuit of voltage-limiting protection function, comprise operational amplifier, slide rheostat, resistance R5, resistance R7, resistance R8,2 ADC transducers; The negative pole of photovoltaic cell connects input power Vo by resistance R6 ground connection, positive pole; After slide rheostat and resistance R5 connect, slide rheostat is connected the positive pole of photovoltaic cell, resistance R5 ground connection; The in-phase input end of operational amplifier 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; Resistance R8 is connected between the output of operational amplifier and inverting input; The input of another ADC transducer is connected between resistance R5 and slide rheostat; The input of ADC transducer is provided with the clamping protective circuit of input signal being carried out to voltage-limiting protection.The utility model circuit structure is simple, and can coordinate with single-chip microcomputer, realize electric current and the voltage sample of battery simply, easily, cost is low.
Description
Technical field
The utility model relates to sample circuit field, particularly, relates to a kind of photovoltaic cell sample circuit with voltage-limiting protection function.
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 prior art, 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.
Utility model content
The purpose of this utility model is just the shortcoming and defect overcoming above-mentioned prior art; the photovoltaic cell sample circuit with voltage-limiting protection function 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 technical scheme in the invention for solving the above technical problem is:
There is the photovoltaic cell sample circuit of voltage-limiting protection function, comprise 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 further improvement of the utility model; 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.
As another improvement of the present utility model, the above-mentioned photovoltaic cell sample circuit with voltage-limiting protection function 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 utility model, the above-mentioned photovoltaic cell sample circuit with voltage-limiting protection function 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 beneficial effects of the utility model are:
The circuit structure of sample circuit of the present utility model 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 utility model 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 utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but execution mode of the present utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1, there is the photovoltaic cell sample circuit of voltage-limiting protection function, comprise 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 utility model, 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 utility model 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 utility model, 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 preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, not departing from the some improvements and modifications under the utility model principle prerequisite, protection range of the present utility model should be considered as.
Claims (5)
1. there is the photovoltaic cell sample circuit of voltage-limiting protection function, it is characterized in that, comprise 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. the photovoltaic cell sample circuit with voltage-limiting protection function 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. the photovoltaic cell sample circuit with voltage-limiting protection function 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 photovoltaic cell sample circuit with voltage-limiting protection function 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 photovoltaic cell sample circuit with voltage-limiting protection function 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520275085.4U CN204633326U (en) | 2015-04-30 | 2015-04-30 | There is the photovoltaic cell sample circuit of voltage-limiting protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520275085.4U CN204633326U (en) | 2015-04-30 | 2015-04-30 | There is the photovoltaic cell sample circuit of voltage-limiting protection function |
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| CN204633326U true CN204633326U (en) | 2015-09-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116306432A (en) * | 2023-03-23 | 2023-06-23 | 北京士模微电子有限责任公司 | Sampling circuit |
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2015
- 2015-04-30 CN CN201520275085.4U patent/CN204633326U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116306432A (en) * | 2023-03-23 | 2023-06-23 | 北京士模微电子有限责任公司 | Sampling circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20160430 |