CN113357566A - Light intensity digital adjusting device and method for steady-state solar simulator - Google Patents
Light intensity digital adjusting device and method for steady-state solar simulator Download PDFInfo
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- CN113357566A CN113357566A CN202110569026.8A CN202110569026A CN113357566A CN 113357566 A CN113357566 A CN 113357566A CN 202110569026 A CN202110569026 A CN 202110569026A CN 113357566 A CN113357566 A CN 113357566A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/006—Solar simulators, e.g. for testing photovoltaic panels
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Abstract
The invention discloses a light intensity digital adjusting device and method for a steady-state solar simulator, and belongs to the field of development of photovoltaic instruments and devices. The invention can directly adjust the light intensity of the sunlight simulator digitally in a program control mode; the light intensity of the steady-state simulator is completely regulated and controlled in a full digitalization manner; according to the invention, a light intensity feedback signal can be obtained through a silicon photodiode, and after 3 standard light intensity points are calibrated, the relationship between the feedback signal and the light intensity and the magnitude of the output current of the programmable power supply is obtained; the invention realizes the adjustment of the output current of the programmable power supply through the programmable instruction, and automatically feeds back and adjusts the current size through setting the light intensity, thereby digitally adjusting the light intensity of the simulator.
Description
Technical Field
The invention belongs to the field of development of photovoltaic instruments and equipment, and particularly relates to a light intensity digital adjusting device and method of a steady-state solar simulator.
Background
The steady-state solar simulator generally adopts a xenon lamp as a light source, the voltage of a driving power supply is basically unchanged after the xenon lamp is lightened, and the illumination intensity of the simulator is changed mainly by adjusting current. Because the illumination intensity and the output current are not in a linear relationship, the current is generally adjusted manually, the output intensity is detected by a standard battery, and the output illumination intensity is adjusted by a manual observation mode. This method is slow in speed of adjustment and is not suitable for program control.
The invention aims to realize digital automatic light intensity adjustment and convenient light intensity setting of a sunlight simulator.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the light intensity digital adjusting device and the light intensity digital adjusting method for the steady-state solar simulator, which are reasonable in design, overcome the defects of the prior art and have good effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light intensity digital adjusting device of a steady-state solar simulator comprises a solar simulator, a light intensity feedback sensor, a standard solar cell, an amplifier, a singlechip and a programmable power supply;
a solar simulator configured to output steady state simulated solar illumination;
the light intensity feedback sensor is configured to monitor the illumination intensity in real time and adjust the output current of the programmable power supply;
the standard solar cell is configured to be used for calibrating the light intensity feedback sensor at the calibration point to obtain the corresponding relation between the detection light intensity of the light intensity feedback sensor and the driving current of the solar simulator;
an amplifier configured to amplify the optical intensity feedback signal;
the single chip microcomputer is configured for carrying out data sampling on the light intensity feedback signal amplified by the amplifier;
a programmable power supply configured to adjust a drive current of the solar simulator;
the light intensity of the solar simulator is 800W/m2To 1200W/m2Large output current in range and programmable power supplyThe feedback values of the light intensity feedback sensors of the three reference illumination points and the corresponding relation of the output current of the programmable power supply are calibrated through a standard solar cell, a programmable command is sent out through calculating a correction coefficient to control the output current of the programmable power supply, and real-time correction is carried out through the feedback values, so that the digital regulation of the output illumination intensity of the solar simulator is achieved.
Preferably, the light intensity feedback sensor employs a silicon photodiode configured for acquiring the light intensity feedback signal.
Preferably, the sunlight simulator adopts a xenon lamp light source.
In addition, the invention also provides a light intensity digital adjusting method of the steady-state solar simulator, which adopts the light intensity digital adjusting device of the steady-state solar simulator and comprises the following steps:
step 1: setting the light intensity through a sunlight simulator;
step 2: calculating and setting the output current of the programmable power supply through a sunlight simulator control program;
and step 3: reading the optical feedback signal value amplified by the amplifier through a singlechip;
and 4, step 4: calculating a theoretical light feedback value through the light intensity set by the sunlight simulator;
and 5: calculating the deviation between the actual optical feedback signal value and the theoretical optical feedback value through a solar simulator control program;
step 6: judging whether the deviation meets the requirement;
if the judgment result is that the deviation meets the requirement, namely the deviation is less than 0.5%, returning to the step 3 to read the actual optical feedback signal value;
or if the judgment result is that the deviation does not meet the requirement, executing the step 4;
and 7: calculating the program-controlled current regulating quantity according to the deviation;
and 8: and (3) setting the current of the program-controlled power supply through a sunlight simulator control program, and then returning to the step 3 to read the actual optical feedback signal value.
The invention has the following beneficial technical effects:
the invention can directly adjust the light intensity of the sunlight simulator digitally in a program control mode; the light intensity of the steady-state simulator is completely regulated and controlled in a full digitalization manner;
according to the invention, a light intensity feedback signal can be obtained through a silicon photodiode, and after 3 standard light intensity points are calibrated, the relationship between the feedback signal and the light intensity and the magnitude of the output current of the programmable power supply is obtained;
the invention realizes the adjustment of the output current of the programmable power supply through the programmable instruction, and automatically feeds back and adjusts the current size through setting the light intensity, thereby digitally adjusting the light intensity of the simulator.
Drawings
FIG. 1 is a schematic view of an optical intensity sample of the present invention;
fig. 2 is a schematic circuit diagram of the regulating device of the present invention.
Fig. 3 is a flow chart of a light intensity adjustment process.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the simulator has high light output original intensity, in order to sample light intensity at an output position, as shown in fig. 1, a silicon photodiode with a light reduction function is needed to perform original sampling, in order to reduce the heating problem caused by overhigh sampling illumination intensity, the general light attenuation ratio is high, and the position of the probe is placed at the edge position of the emergent light, so that correction needs to be added into software for judging the light intensity of a central area. The attenuated optical signal is converted into a current signal through photoelectric conversion and transmitted to the sunlight simulator illumination detection circuit for detection.
As shown in fig. 2, the output current value of the silicon photodiode is about 5-15uA, a high-gain operational amplifier circuit is used to measure the weak current, the weak current is amplified into a maximum voltage signal of 2.25V, and a single-chip ADC is used to sample the voltage signal to obtain an optical feedback signal value.
In order to obtain a more accurate light intensity adjustment, the light feedback value needs to be calibrated. Definition 800W/m2、1000W/m2、1200W/m2Three calibration points for regulating output current of programmable power supplyAnd adjusting the light intensity to each calibration point by measuring the short-circuit current of the standard battery, and further obtaining the light feedback signal value and the output current value of the programmable power supply of each calibration point.
As shown in fig. 3, which is a flow chart of the light intensity adjusting process, the light intensity adjusting process includes setting light intensity and adjusting light intensity stability, and a theoretical light feedback value and a programmable power supply output current under the light intensity are calculated according to a calibration point standard value, and the theoretical light feedback value is used as a standard reference value for setting illumination. The light intensity is preliminarily adjusted by controlling the output current of the programmable power supply through a program; and then, accurately adjusting the output current of the programmable power supply according to the deviation of the actual optical feedback signal value and the theoretical optical feedback value until the deviation of the actual optical feedback value and the theoretical optical feedback value meets the requirement.
The specific process is as follows:
step 1: setting the light intensity through a sunlight simulator;
step 2: calculating and setting the output current of the programmable power supply through a sunlight simulator control program;
and step 3: reading the optical feedback signal value amplified by the amplifier through a singlechip;
and 4, step 4: calculating a theoretical light feedback value through the light intensity set by the sunlight simulator;
and 5: calculating the deviation between the actual optical feedback signal value and the theoretical optical feedback value through a solar simulator control program;
step 6: judging whether the deviation meets the requirement;
if the judgment result is that the deviation meets the requirement, namely the deviation is less than 0.5%, returning to the step 3 to read the actual optical feedback signal value;
or if the judgment result is that the deviation does not meet the requirement, executing the step 4;
and 7: calculating the program-controlled current regulating quantity according to the deviation;
and 8: and (3) setting the current of the program-controlled power supply through a sunlight simulator control program, and then returning to the step 3 to read the actual optical feedback signal value.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (4)
1. A light intensity digital adjusting device of a steady-state solar simulator is characterized in that: the device comprises a sunlight simulator, a light intensity feedback sensor, a standard solar cell, an amplifier, a singlechip and a programmable power supply;
a solar simulator configured to output steady state simulated solar illumination;
the light intensity feedback sensor is configured to monitor the illumination intensity in real time and adjust the output current of the programmable power supply;
the standard solar cell is configured to be used for calibrating the light intensity feedback sensor at the calibration point to obtain the corresponding relation between the detection light intensity of the light intensity feedback sensor and the driving current of the solar simulator;
an amplifier configured to amplify the optical intensity feedback signal;
the single chip microcomputer is configured for carrying out data sampling on the light intensity feedback signal amplified by the amplifier;
a programmable power supply configured to adjust a drive current of the solar simulator.
2. The method of digitally adjusting the light intensity of a steady-state solar simulator of claim 1, wherein: the light intensity feedback sensor adopts a silicon photodiode and is configured for acquiring a light intensity feedback signal.
3. The method of digitally adjusting the light intensity of a steady-state solar simulator of claim 1, wherein: the sunlight simulator adopts a xenon lamp light source.
4. A light intensity digital regulation method of a steady-state solar simulator is characterized in that: the light intensity digital adjusting device of the steady-state solar simulator of claim 1 is adopted, comprising the following steps:
step 1: setting the light intensity through a sunlight simulator;
step 2: calculating and setting the output current of the programmable power supply through a sunlight simulator control program;
and step 3: reading the optical feedback signal value amplified by the amplifier through a singlechip;
and 4, step 4: calculating a theoretical light feedback value through the light intensity set by the sunlight simulator;
and 5: calculating the deviation between the actual optical feedback signal value and the theoretical optical feedback value through a solar simulator control program;
step 6: judging whether the deviation meets the requirement;
if the judgment result is that the deviation meets the requirement, namely the deviation is less than 0.5%, returning to the step 3 to read the actual optical feedback signal value;
or if the judgment result is that the deviation does not meet the requirement, executing the step 4;
and 7: calculating the program-controlled current regulating quantity according to the deviation;
and 8: and (3) setting the current of the program-controlled power supply through a sunlight simulator control program, and then returning to the step 3 to read the actual optical feedback signal value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244276A (en) * | 2021-12-21 | 2022-03-25 | 成都中建材光电材料有限公司 | Cadmium telluride standard solar cell calibration, storage and use method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244276A (en) * | 2021-12-21 | 2022-03-25 | 成都中建材光电材料有限公司 | Cadmium telluride standard solar cell calibration, storage and use method |
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