CN204425272U - A kind of solar cell properties testing equipment - Google Patents

Abstract

The utility model discloses a solar cell performance testing device, which comprises: a processing module, a DA converter, an electronic load, a current sampling circuit, a current AD converter, a voltage sampling circuit, a voltage AD converter, and a first gear dial switch , wherein: the processing module inputs digital electrical signals and step length control signals to the DA converter; the DA converter performs digital-to-analog conversion on the received digital electrical signals, and increases the step size according to the voltage indicated by the step size control signal, and outputs each voltage in sequence The voltage signal of the value is applied to the electronic load; the electronic load is connected in series with the solar cell under test; the processing module generates the performance curve of the solar cell under test based on the received converted current sampling result and the converted voltage sampling result, realizing It is a multi-level test for the performance of solar cells, and reduces the complexity of the circuit compared with the prior art.

Description

A kind of solar cell performance testing equipment

technical field

The utility model relates to the technical field of solar cells, in particular to a solar cell performance testing device.

Background technique

Today, with the rapid development of industrial modernization, the massive consumption of traditional energy has led to serious energy shortages. And solar energy has increasingly occupied an important position by virtue of its inexhaustible, inexhaustible, clean and environmentally friendly advantages. As a direct conversion medium of solar energy and electric energy, the output of solar cells is increasing day by day, and how to test solar cells with high precision plays an important role in improving the conversion efficiency of solar cells.

At present, the commonly used performance test scheme is to adjust the electronic load through the DA converter to change the current flowing through the solar cell, and use a high-precision AD converter to collect a certain number of current and voltage values to obtain the performance curve of the solar cell.

In order to apply to the test requirements of more types of solar cells, it is often necessary to change the test gear. The traditional multi-level test scheme realizes multi-level testing by switching different resistances connected to change the multiple of voltage and current amplification or reduction. Although this method has the advantage of flexible switching, the gear selection range is small and rough. At the same time, too many types of resistors in series will increase the complexity of the circuit, which is not conducive to the stability of the test.

Utility model content

The embodiment of the utility model provides a solar cell performance testing device, which is used to solve the problem in the prior art that the circuit of the device for realizing the multi-level performance test of the solar cell is relatively complicated.

The embodiment of the utility model provides a solar cell performance testing device, including:

Processing module, DA converter, electronic load, current sampling circuit, current AD converter, voltage sampling circuit, voltage AD converter, first gear dial switch, wherein:

The processing module inputs a digital electrical signal and a step size control signal to the DA converter, and the step size control signal is used to indicate the voltage increase step size corresponding to the current gear position of the first gear position dial switch;

The DA converter performs digital-to-analog conversion on the received digital electrical signal, and increases the step size according to the voltage indicated by the step size control signal, and sequentially outputs voltage signals of various voltage values, and applies them to the electronic load superior;

The electronic load is connected in series with the tested solar cell;

The current sampling circuit samples the current flowing through the solar cell under test to obtain a current sampling result, and outputs the current sampling result to the processing module after performing analog-to-digital conversion on the current sampling result by the current AD converter;

The voltage sampling circuit samples the voltage of the solar cell under test to obtain a voltage sampling result, and outputs the voltage sampling result to the processing module after analog-to-digital conversion is performed on the voltage sampling result by the voltage AD converter;

The processing module generates a performance curve of the solar cell under test based on the received converted current sampling results and converted voltage sampling results.

Further, it also includes: a magnification adjustment module, configured to adjust the magnification of the current sampling circuit, and adjust the magnification of the voltage sampling circuit.

Further, the magnification adjustment module includes: a second gear dial switch, a relay and a plurality of precision resistors with different resistance values;

Wherein, the second gear dial switch is used to control the relay to connect the precision resistors with different resistances to adjust the amplification factor of the current sampling circuit and to adjust the amplification factor of the voltage sampling circuit.

Further, the processing module is a single-chip microcomputer.

The beneficial effects of the utility model include:

When using the performance test equipment provided by the embodiment of the present invention to perform performance tests on solar cells, the first gear dial switch can be used to select the gear position, and the step length control signal is input to the DA converter through the processing module for Control the DA converter to increase the step size according to the voltage indicated by the step size control signal, output voltage signals of each voltage value in sequence, apply them to the electronic load, and sample the current and voltage of the solar cell under test through the current sampling circuit and the voltage sampling circuit respectively. The voltage and the results are respectively converted from analog to digital by the current AD converter and the voltage AD converter, and then output to the processing module, which generates the performance curve of the solar cell under test. Since the first gear position dial switch and the processing module can be used to control the voltage increase step size of each voltage value output by the DA converter through the gear position selection, the multi-level test is realized, and compared with the prior art, it achieves the same In the case of reducing the number of gears, the complexity of the circuit of the device is reduced.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is the structural representation of the solar cell performance testing equipment provided by the utility model embodiment 1;

Fig. 2 is one of the structural diagrams of the solar cell performance testing equipment provided by the utility model embodiment 2;

FIG. 3 is the second structural schematic diagram of the solar cell performance testing equipment provided by Embodiment 2 of the present invention.

Detailed ways

In order to provide an implementation plan for reducing the complexity of the circuit of the equipment for multi-level performance testing of solar cells, the embodiment of the utility model provides a solar battery performance testing equipment. The following is a preferred implementation of the utility model in conjunction with the accompanying drawings It should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Example 1:

Embodiment 1 of the present utility model provides a solar cell performance testing device, as shown in Figure 1, comprising:

Processing module 11, DA converter 12, electronic load 13, current sampling circuit 14, current AD converter 15, voltage sampling circuit 16, voltage AD converter 17, first gear dial switch 18, wherein:

The processing module 11 inputs a digital electrical signal and a step length control signal to the DA converter 12, and the step length control signal is used to indicate the voltage increase step size corresponding to the current gear position of the first gear position dial switch 18;

The DA converter 12 performs digital-to-analog conversion on the received digital electrical signal, and increases the step size according to the voltage indicated by the step size control signal, and sequentially outputs voltage signals of various voltage values, and applies them to the electronic load 13;

The electronic load 13 is connected in series with the tested solar cell 19;

The current sampling circuit 14 samples the current flowing through the measured solar cell 19 to obtain the current sampling result, and after the current AD converter 15 performs analog-to-digital conversion on the current sampling result, the result is output to the processing module 11;

The voltage sampling circuit 16 samples the voltage of the solar cell 19 under test to obtain a voltage sampling result, and after the analog-to-digital conversion is performed on the voltage sampling result by the voltage AD converter 17, the result is output to the processing module 11;

The processing module 11 generates a performance curve of the tested solar cell 19 based on the received converted current sampling result and converted voltage sampling result.

In the solar cell performance testing equipment provided in Embodiment 1 of the present utility model, the processing module 11 may be a single-chip microcomputer.

In Embodiment 1 of the present utility model, the first gear dial switch 18 of the solar battery performance test equipment has multiple gear positions, and each gear position corresponds to a voltage increase step size. During the test, a gear position can be selected through the first gear dial switch 18, and after the test is started, the processing module 11 will input the digital electrical signal to the DA converter 12, and will also input the step length control signal to control the DA converter 12. The converter 12 performs digital-to-analog conversion on the received digital electrical signal, and increases the step size according to the voltage indicated by the step size control signal, sequentially outputs voltage signals of various voltage values, and applies them to the electronic load 13 .

For example, the range of the output voltage value is 0-5v. If the step size of the voltage increase is 50mv, it will increase 50mv each time from small to large, and output voltage signals of 100 sets of voltage values. If the step size of the voltage increase is 100mv, then It will increase 100mv each time from small to large, and output voltage signals of 50 sets of voltage values, so that the measurement of different gears can be realized.

In practical applications, the number of gears of the first gear dial switch 18 and the voltage increment step size corresponding to each gear can be flexibly set according to actual needs, and will not be described in detail here with examples.

The solar battery performance test equipment provided by Embodiment 1 of the present utility model uses the first gear dial switch 18 to control the voltage increase step of the DA converter 12 through the processing module 11, thereby realizing the multi-gear of the solar battery. According to the test, compared with the prior art, the complexity of the circuit of the device is reduced under the condition of realizing the same number of gears.

Example 2:

Embodiment 2 of the present invention provides a solar cell performance testing device, as shown in Figure 2, comprising:

Processing module 21, DA converter 22, electronic load 23, current sampling circuit 24, current AD converter 25, voltage sampling circuit 26, voltage AD converter 27, first gear dial switch 28, magnification adjustment module 29, in:

The processing module 21 inputs a digital electrical signal and a step length control signal to the DA converter 22, and the step length control signal is used to indicate the voltage increase step size corresponding to the current gear position of the first gear position dial switch 28;

The DA converter 22 performs digital-to-analog conversion on the received digital electrical signal, and increases the step size according to the voltage represented by the step size control signal, and sequentially outputs voltage signals of various voltage values, and applies them to the electronic load 23;

The electronic load 23 is connected in series with the tested solar cell 30;

The current sampling circuit 24 samples the current flowing through the measured solar cell 30 to obtain a current sampling result, and after the current AD converter 25 performs analog-to-digital conversion on the current sampling result, the result is output to the processing module 21;

The voltage sampling circuit 26 samples the voltage of the solar cell 30 under test to obtain a voltage sampling result, and after the analog-to-digital conversion is performed on the voltage sampling result by the voltage AD converter 27, the result is output to the processing module 21;

The processing module 21 generates a performance curve of the solar cell 30 under test based on the received converted current sampling result and converted voltage sampling result;

The amplification factor adjustment module 29 is used for adjusting the amplification factor of the current sampling circuit 24 and adjusting the amplification factor of the voltage sampling circuit 26 .

In the solar battery performance testing equipment provided by Embodiment 2 of the present utility model, the processing module 21 may be a single-chip microcomputer.

Wherein, the magnification adjustment module 29, as shown in FIG. 3 , may include: a second gear dial switch 291, a relay 292 and a plurality of precision resistors 293 with different resistance values;

Wherein, the second gear dial switch 291 is used to control the relay 292 to connect with precision resistors 293 of different resistances, so as to adjust the amplification factor of the current sampling circuit 24 and the voltage sampling circuit 26 .

Specifically, the second gear dial switch 291 may be a multi-channel electronic switch.

In Embodiment 2 of the present utility model, the first gear dial switch 28 of the solar battery performance testing equipment has multiple gear positions, and each gear position corresponds to a voltage increase step length, and the second gear position dial switch 291 also has multiple gear positions. Each gear corresponds to a current magnification and a voltage magnification. When using the performance test equipment to perform a performance test on a solar battery, you can first select a gear through the second gear dial switch 291. After the second gear switch 291 selects a gear, the control relay is connected to the precision resistor corresponding to the gear, so that the magnification of the current sampling circuit 24 is adjusted to the current magnification corresponding to the gear, and the voltage adjustment is realized. The magnification of the sampling circuit 26 is the voltage magnification corresponding to the gear, so as to realize the measurement of different gears.

Then select a gear through the first gear dial switch 28 to realize the selection of the voltage increase step of the DA converter 22 .

For example, the range of the output voltage value is 0-5v, if the step size of the voltage increase is 50mv, it will increase 50mv each time from small to large, and output voltage signals of 200 sets of voltage values, if the step size of the voltage increase is 200mv, then It will increase 200mv each time from small to large, and output voltage signals of 50 sets of voltage values, so that the measurement of different gears can be realized.

After starting the test, while the processing module 21 inputs the digital electrical signal to the DA converter 22, it will also input the step length control signal to control the DA converter 22 to perform digital-to-analog conversion on the received digital electrical signal, and according to the step length control signal The indicated voltage is increased by a step length, and voltage signals of various voltage values are sequentially output and applied to the electronic load 23 .

The current sampling circuit 24 and the voltage sampling circuit 26 respectively sample the current and voltage of the solar cell 30 to be tested, and the results are respectively subjected to analog-to-digital conversion by the current AD converter 25 and the voltage AD converter 27, and then output to the processing module 21. The processing module 21 generates a performance curve of the tested solar cell to complete the performance test of the tested solar cell 30 .

In practical applications, the number of gears of the first gear dial switch 28 and the voltage increment step size corresponding to each gear can be flexibly set according to actual needs, and will not be described in detail here with examples.

The number of gears of the second gear dial switch 291 , and the current amplification factor and voltage amplification factor corresponding to each gear position can be flexibly set according to actual needs, and will not be described in detail here.

The solar battery performance test equipment provided by Embodiment 2 of the utility model uses the second gear dial switch 291 to realize the adjustment of the amplification factor of the current sampling circuit 24 and the voltage sampling circuit 26, and uses the first gear dial switch 28. The processing module 21 controls the adjustment of the voltage increase step size of the DA converter 22, thereby realizing the multi-level test of the solar cell. Compared with the prior art, when the same number of gear levels is achieved, the reduction in The complexity of the circuit of the device.

Wherein, the second gear dial switch 291 can be equivalent to the coarse gear dial switch, the first gear dial switch 28 can be equivalent to the fine gear dial switch, and the coarse gear dial switch and the fine gear dial switch have been used successively. The test gear is selected by the dial switch, which further increases the number of optional test gears.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (4)

1. A solar cell performance testing device, characterized in that, comprising: Processing module, DA converter, electronic load, current sampling circuit, current AD converter, voltage sampling circuit, voltage AD converter, first gear dial switch, wherein: The processing module inputs a digital electrical signal and a step size control signal to the DA converter, and the step size control signal is used to indicate the voltage increase step size corresponding to the current gear position of the first gear position dial switch; The DA converter performs digital-to-analog conversion on the received digital electrical signal, and increases the step size according to the voltage indicated by the step size control signal, and sequentially outputs voltage signals of various voltage values, and applies them to the electronic load superior; The electronic load is connected in series with the tested solar cell; The current sampling circuit samples the current flowing through the solar cell under test to obtain a current sampling result, and outputs the current sampling result to the processing module after performing analog-to-digital conversion on the current sampling result by the current AD converter; The voltage sampling circuit samples the voltage of the solar cell under test to obtain a voltage sampling result, and outputs the voltage sampling result to the processing module after analog-to-digital conversion is performed on the voltage sampling result by the voltage AD converter; The processing module generates a performance curve of the solar cell under test based on the received converted current sampling results and converted voltage sampling results. 2. The performance testing device according to claim 1, further comprising: a magnification adjustment module, configured to adjust the magnification of the current sampling circuit, and adjust the magnification of the voltage sampling circuit. 3. The performance testing device according to claim 2, wherein the magnification adjustment module includes: a second gear dial switch, a relay and a plurality of precision resistors with different resistance values; Wherein, the second gear dial switch is used to control the relay to connect the precision resistors with different resistances to adjust the amplification factor of the current sampling circuit and to adjust the amplification factor of the voltage sampling circuit. 4. The performance testing device according to any one of claims 1-3, wherein the processing module is a single-chip microcomputer.