JP2011009358A - Solar cell evaluation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell evaluating device capable of determining the presence or the absence of faults in a solar cell.SOLUTION: The solar cell evaluating device 20 evaluates the output characteristics of a multi-junction solar cell 22, by applying dummy sunlight from an LED light source 23 for testing including a plurality of LEDs, having different light-emitting wavelengths to the multi-junction solar cell 22. The solar cell evaluation device includes a voltage application means 24 for successively applying pulse voltages to respective LEDs of the LED light source 23 for testing with a prescribed time difference, and an evaluation means 25 for determining the presence or the absence of a fault and fault location in the multi-junction solar cell 22, based on an output situation of the multi-junction solar cell 22 for generating an electromotive voltage by receiving the light emitted from the respective LEDs.

Description

  The present invention relates to a solar cell evaluation device for irradiating a solar cell with a plurality of LEDs having different emission wavelengths to evaluate the output characteristics of the solar cell.

  Solar cells are known as a means of effectively using solar energy, but in practice, solar cell panels composed of solar cell modules formed by connecting a plurality of solar cells are used on the roofs of buildings and general houses. Solar energy is converted into electric energy by laying.

  By the way, it is important to evaluate the output characteristics of the solar cell in the inspection after the manufacture of the solar cell and the research and development of the solar cell, but the evaluation is performed by irradiating the solar cell with sunlight. It is difficult to always expect a correct result because the intensity of sunlight fluctuates due to, for example.

  Therefore, Patent Document 1 proposes a solar cell evaluation method using an LED as a light source. This method irradiates a solar cell with light from a multi-wavelength LED light-emitting unit, and irradiates light intensity (W) for each wavelength from the multi-wavelength light-emitting unit and output short-circuit current (A) of the solar cell for each wavelength. To measure the absolute spectral sensitivity (A / W) of the solar cell.

  Patent Document 2 proposes an output measurement method for evaluating the output in a reference state of a photoelectric conversion element such as a solar battery formed by stacking a plurality of element cells.

JP 2004-281706 A JP 2006-135196 A

  By the way, a multijunction solar cell is known in which conversion efficiency is improved by stacking a plurality of element cells having different spectral sensitivities. According to this multijunction solar cell, photoelectric conversion is performed over a wide wavelength region of incident light. Conversion is possible, and overall conversion efficiency is increased.

  The output characteristics of such a multi-junction solar cell are evaluated by the methods proposed in Patent Documents 1 and 2, etc., but it is determined whether or not the multi-junction solar cell has failed, It was not possible to identify the element cell.

  Therefore, an object of this invention is to provide the solar cell evaluation apparatus which can determine the location of the failure of a solar cell and the presence or absence of failure of a multijunction solar cell with a simple configuration.

  Further, Patent Documents 1 and 2 do not disclose any countermeasures when the LED temperature becomes room temperature or higher due to the lighting of the LED and the test environment, for example, provision of cooling means. In general, the luminous efficiency of an LED decreases as the temperature rises. Therefore, when the LED temperature rises, the output from the LED fluctuates, causing a problem that the output characteristics of the solar cell cannot be evaluated with high accuracy. In particular, when LED elements with different emission colors are used, different color LEDs have different temperature-emission efficiency characteristics. Therefore, when the LED temperature rises, color unevenness of irradiated light occurs, and the output characteristics of the solar cell are improved. The accuracy cannot be evaluated.

  Accordingly, an object of the present invention is to provide a solar cell evaluation apparatus that can highly accurately evaluate the output characteristics of a solar cell while suppressing the occurrence of illuminance unevenness and color unevenness of pseudo-sunlight.

  In order to achieve the above object, the invention described in claim 1 evaluates the output characteristics of the solar cell by irradiating the solar cell with simulated sunlight from a test LED light source including a plurality of LEDs having different emission wavelengths. In the solar cell evaluation apparatus, voltage applying means for sequentially applying a pulse voltage to each LED of the test LED light source with a predetermined time difference, and the solar cell that generates an electromotive force upon irradiation with light emitted from each LED According to the present invention, there is provided a determination means for determining the presence / absence and failure position of the solar cell based on the output status.

  According to a second aspect of the present invention, in the first aspect of the invention, the test LED light source includes a plurality of water-cooled LED units including a plurality of LEDs having different emission wavelengths and a water-cooling unit that cools the LEDs. It is characterized by comprising.

  The invention described in claim 3 is the invention described in claim 1, characterized in that the solar cell is a multi-junction solar cell in which a plurality of element cells having different spectral sensitivities are stacked.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the test LED light source and the multi-junction solar cell are each divided into a plurality of corresponding blocks, and a pulse voltage applied to each LED by the voltage applying means. And determining whether or not there is a failure of the multi-junction solar cell by the determination means is sequentially performed for each block.

  According to the present invention, when the solar cell is, for example, a multi-junction solar cell, a failure occurs in the multi-junction solar cell if a voltage application means sequentially applies a pulse voltage to each LED of the test LED light source with a predetermined time difference. If not, among the plurality of element cells of the multi-junction solar cell, the element cell showing high spectral sensitivity with respect to the emission wavelength of each LED generates an electromotive force with a predetermined time difference. When a failure has occurred in the cell, no electromotive force is output from the failed element cell, so that the determination means can determine whether or not the multijunction solar cell has failed and the location of the failure.

  In addition, according to the present invention, a plurality of LEDs that are heat generation sources are forcibly cooled by the water cooling units provided in each of the water-cooled LED units constituting the test LED light source, so that the temperature rise of the LEDs is suppressed, The LED temperature is kept constant, and fluctuations in the output of the LED and the occurrence of illuminance unevenness and color unevenness of the pseudo-sunlight emitted from the test LED light source are suppressed, and the output characteristics of the solar cell are evaluated with high accuracy. Can do.

  Furthermore, according to the present invention, the test LED light source and the multi-junction solar cell are divided into a plurality of corresponding blocks, and the application of the pulse voltage to each LED by the voltage application unit and the multi-junction solar cell by the determination unit Since the determination of the presence / absence of the failure is sequentially performed for each block, the block (location) where the failure of the multi-junction solar cell has occurred and the failed element cell can be specified.

It is a block diagram which shows the basic composition of the solar cell evaluation apparatus which concerns on this invention. It is a perspective view of the water cooling type | mold LED unit which comprises the LED light source for a test. It is a front view (figure of the arrow A direction of FIG. 2) of the water cooling type | mold LED unit which comprises the LED light source for a test. It is a side view (figure of the arrow B direction of FIG. 2) of the water cooling type | mold LED unit which comprises the LED light source for a test. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a figure which shows typically LED arrangement | positioning in a water-cooling type LED unit, and the application of the pulse voltage to this LED. It is a figure which shows the relationship between the temperature of LED, and a drive current. It is a block diagram which shows the basic composition of the solar cell evaluation apparatus which concerns on this invention. It is a figure which shows generation | occurrence | production of the electromotive force in a multijunction solar cell.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, “LEDs having different emission wavelengths” are not only those having different emission wavelengths from LED (light emitting diode) elements, but also wavelength-converting all or part of the light emitted from the LED elements. In this way, LEDs having different emission wavelengths are included.

  FIG. 1 is a perspective view showing the configuration of a multijunction solar cell evaluation apparatus according to the present invention. The illustrated multijunction solar cell evaluation apparatus 20 is a panel-shaped multijunction housed in a rectangular box-shaped test chamber 21. An apparatus for evaluating the output characteristics of the multi-junction solar cell 22 by irradiating the solar cell 22 with pseudo-sunlight, and a test LED light source 23 is used as a light source for irradiating the multi-junction solar cell 22 with pseudo-sunlight. The

  The test LED light source 23 is configured by arranging a plurality of water-cooled LED units 1 in the vertical and horizontal directions (in the present embodiment, 6 horizontal x 5 vertical = 30 in total) in a matrix. Although not shown, between the multi-junction solar cell 22 accommodated in the test chamber 21 and the test LED light source 23, the pseudo-sunlight from the test LED light source 23 is transmitted and moisture is blocked. A transparent member such as quartz glass is disposed.

  Next, the configuration of each water-cooled LED unit 1 constituting the test LED light source 23 will be described with reference to FIGS. Since all the water-cooled LED units 1 have the same configuration, only one water-cooled LED unit 1 will be described below.

  2 is a perspective view of the water-cooled LED unit, FIG. 3 is a front view of the water-cooled LED unit (a view in the direction of arrow A in FIG. 2), and FIG. 4 is a side view of the water-cooled LED unit (arrow in FIG. 2). 5 is a cross-sectional view taken along the line CC of FIG. 4, FIG. 6 is a cross-sectional view taken along the line DD of FIG. 4, and FIG. 7 is an LED arrangement and a pulse to the LED in the water-cooled LED unit. It is a figure which shows application of a voltage.

  As shown in FIGS. 5 and 6, the water-cooled LED unit 1 is configured by incorporating a light source unit 3, a control circuit 4, and a water-cooled unit 5 inside a rectangular box-shaped housing 2. The light irradiation direction of the water-cooled LED unit 1 is the lower side of FIG. 2, and the water-cooled LED unit 1 is installed so that the light irradiation direction is horizontal as shown in FIG. The top and bottom of the water-cooled LED unit 1 in FIG.

  The housing 2 is made of a resin such as PC or a metal such as aluminum, and as shown in FIG. 2, an air inlet 6 composed of a plurality of slits elongated in the vertical direction is formed on the peripheral surface, and the upper surface is formed on the upper surface. Is formed with an exhaust port 7 formed of a plurality of fan-shaped slits. The lower surface of the housing 2 is open, and the light source unit 3 is fitted and fixed in the opening.

  As shown in FIGS. 5 and 6, the light source unit 3 has four types of LEDs 8a, 8b, 8c, and 8d having different emission wavelengths (between emission wavelengths of 0.3 μm and 1.5 μm) as light sources (see FIG. 7). ), A rectangular plate-like base 10 to which the substrate 9 is attached, and a rectangular plate-like transparent resin lens 11 fitted into the lower surface opening of the housing 2.

  Here, among the LEDs 8a to 8d having different emission wavelengths, the LED 8a is a GaAlAs-based infrared LED (wavelength 850 nm), the LED 8b is a GaN-based ultraviolet (wavelength 365 nm) LED, the LED 8c is a GaAlAs-based red (wavelength 630 nm) LED, The LED 8 d is a GaN-based blue (wavelength 455 nm) LED, and these are arranged on the substrate 9. FIG. 8 shows the relationship between the temperature (° C.) of these LEDs 8a to 8d and the drive current (A). As is clear from the figure, when the temperature exceeds 50 ° C., the drive current to each LED 8a to 8d is shown. The maximum operating temperature of each LED 8a to 8d is 80 ° C. Here, the temperature of the LEDs 8a to 8d refers to a junction temperature that is the temperature of the chip joint. FIG. 7 shows the arrangement of the LEDs 8a to 8d in the two water-cooled LED units 1 and the application of the pulse voltage to the LEDs 8a to 8d.

  In addition, as shown in FIG. 5, the control circuit 4 incorporates a circuit board (not shown) on which various electronic components are mounted in a rectangular box-shaped circuit case 12 whose bottom surface is open, and opens the bottom surface of the circuit case 12. It is configured by covering the portion with a rectangular plate-shaped cover 13. Here, the circuit case 12 is formed by aluminum die casting or the like having high thermal conductivity, and a large number of heat radiation pins 14 constituting a heat radiation portion are integrally projected on the upper surface thereof.

  As shown in FIGS. 5 and 6, the water cooling unit 5 includes a water cooling jacket 15 that is a heat exchanger and heat of the cooling water that has received heat in the water cooling jacket 15 and increased in temperature to the outside air (cooling air). A radiator 16 for cooling by replacement, a fan 17 for supplying cooling air to the radiator 16, a circulation pump 18 for circulating the cooling water in a closed loop circulation path, and a reserve tank 19 for storing the cooling water. 17 is disposed above and facing the radiator 16.

  In the present embodiment, as shown in FIGS. 5 and 6, a water cooling jacket 15 is horizontally disposed at the bottom of the lower portion in the housing 2, and the control circuit 4 and the light source are disposed above and below the water cooling jacket 15. Unit 3 is arranged. Here, the control circuit 4 is disposed on the upper surface side of the water cooling jacket 15 in a state where the cover 13 is in close contact with the upper surface of the water cooling jacket 15. In this embodiment, an antifreeze liquid obtained by mixing water with propylene glycol is used as the cooling water.

  On the other hand, as shown in FIGS. 5 and 6, the radiator 16 and the fan 17 are disposed in the upper portion of the housing 2 apart from the water cooling jacket 15, and the space between the water cooling jacket 15 and the radiator 16 is disposed. The control circuit 4, the circulation pump 18 and the reserve tank 19 are arranged.

  Thus, when the water-cooled LED unit 1 configured as described above is activated and power is supplied to the light source unit 3, the control circuit 4, and the water-cooled unit 5, the light source unit 3 emits four types of light having different emission wavelengths. The LEDs 8a to 8d emit light, the lights of the respective colors are combined, and pseudo sunlight passes through the lens 11 and is irradiated downward in FIG. At this time, the lighting control of the light source unit 3 is performed by the control circuit 4, and the LEDs 8a to 8d of the light source unit 3 and various electronic components (not shown) of the control circuit 4 generate heat during driving, and the light source unit 3 and the control circuit remain as they are. 4 is overheated and these temperatures rise. As described above, the luminous efficiency decreases as the temperatures of the various LEDs 8a to 8d of the light source unit 3 increase, and the supply current also decreases as shown in FIG.

  However, in the present embodiment, the water cooling unit 5 is driven at the same time, and the light source unit 3 and the control circuit 4 are forcibly cooled by the cooling water circulating in the circulation path forming the closed loop, and the temperature rise is suppressed. That is, the cooling water circulated through the circulation path by the circulation pump 18 receives heat generated in the light source unit 3 and the control circuit 4 in the water cooling jacket 15 to cool the light source unit 3 and the control circuit 4, and receives the heat to change the temperature. The raised cooling water is introduced into the radiator 16.

  On the other hand, when the fan 17 is rotationally driven by a motor (not shown), outside air is sucked into the housing 2 from the side as the cooling air from the intake port 6 formed in the peripheral surface of the housing 2, and this cooling air is supplied to the water cooling jacket. 15 flows upward through a space formed between the radiator 15 and the radiator 16, passes through the radiator 16 in the process, and is discharged to the outside through the exhaust port 7 opened on the upper surface of the housing 2. In the radiator 16, the heat of the cooling water is radiated to the outside by the cooling air passing therethrough to cool the cooling water, and the cooling liquid water whose temperature has decreased is sucked into the circulation pump 18.

  The cooling water sucked into the circulation pump 18 is increased in pressure and then sent out from the circulation pump 18 to the reserve tank 19, a part of which is stored in the reserve tank 19, and the remaining cooling water is supplied from the reserve tank 19 to the water cooling jacket 15. The light source unit 3 and the control circuit 4 are cooled. Then, the above operation (cooling cycle) is continuously repeated, and the light source unit 3 and the control circuit 4 are forcibly cooled by the cooling water flowing through the water cooling jacket 15, and the temperature rise thereof is suppressed to a certain value or less. In the present embodiment, the lower surface of the control circuit 4 is brought into close contact with the water cooling jacket 15, and a large number of heat radiation pins 14 constituting the heat radiation portion are projected on the upper surface, so that the control circuit 4 is forcibly cooled by the cooling water. At the same time, natural heat is radiated from the radiating pins 14, the control circuit 4 is efficiently cooled, and the temperature rise is more effectively suppressed.

  As described above, the temperature rise of each of the LEDs 8a to 8d is prevented and the temperature is kept constant. As a result, the output fluctuation of each of the LEDs 8a to 8d and the generation of illuminance unevenness and color unevenness of the pseudo-sunlight which is irradiation light. It can be suppressed.

  Thus, the multi-junction solar cell evaluation apparatus 20 shown in FIG. 1 equipped with the test LED light source 23 has the test LED light source 23 in a predetermined test environment (humidity 10% to 100%, temperature 20 ° C. to 90 ° C.). The output characteristics of the multi-junction solar cell 22 are evaluated by performing an accelerated test in which the pseudo-sunlight emitted from the multi-junction solar cell 22 is irradiated through a transparent member (not shown). Since the multi-junction solar cell 22 is irradiated with the pseudo-sunlight by the test LED light source 23 configured by installing a plurality of the water-cooled LED units 1 shown in FIGS. 2 to 6, each water-cooled type as described above. The temperatures of the various LEDs 8a to 8d (see FIG. 7) of the LED unit 1 are kept constant. For this reason, generation | occurrence | production of the illumination intensity nonuniformity and color nonuniformity of the pseudo-sunlight radiate | emitted from the test LED light source 23 is suppressed, and the output characteristic of the multijunction solar cell 22 is evaluated with high precision.

  In this embodiment, since a transparent member (not shown) such as quartz glass is disposed between the multi-junction solar cell 22 accommodated in the test chamber 21 and the test LED light source 23, the moisture in the test chamber 21 Intrusion into the test LED light source 23 is blocked by the transparent member, the test LED light source 23 is not adversely affected by moisture, and the test LED light source 23 can be stably operated. In this case, the pseudo-sunlight from the test LED light source 23 passes through the transparent member and is stably irradiated to the multi-junction solar cell 22.

  By the way, the multi-junction solar cell 22 is configured by laminating element cells that exhibit different spectral sensitivities with respect to the emission wavelengths of the LEDs 8 a to 8 d of the test LED light source 23. When the element cells are connected in series, the output characteristics of the multijunction solar cell are limited by the current value output by each element cell. For example, a solar cell having a two-junction tandem structure that has been put into practical use as a thin-film Si type solar cell includes a solar cell that uses amorphous silicon as a top layer and microcrystalline silicon as a bottom layer. In the case of three junctions (triple structure), there are various combinations of materials. For example, there are series junctions of element cells such as amorphous Si, amorphous SiGe, and microcrystalline Si in order from the top layer. In addition, the multi-junction solar cell 22 is a module composed of a plurality of cells having one cell as a section corresponding to one water-cooled LED unit 1 constituting the test LED light source 23 (in this embodiment, 30 cells). Cell). The module has a known structure in which a large number of solar cells are connected and then sealed with glass and a back film.

  Thus, the multi-junction solar cell evaluation device 20 according to the present invention can determine whether or not the multi-junction solar cell 22 has failed, and can further identify the cell in which the failure has occurred. Furthermore, the failure location in the module and the failed element cell can be specified in correspondence with the irradiation wavelength of the LED light source. Hereinafter, this will be described with reference to FIG. 7, FIG. 9 and FIG.

  FIG. 7 is a diagram schematically showing LED arrangement and application of pulse voltage to the LED in the water-cooled LED unit, FIG. 9 is a block diagram showing the basic configuration of the multi-junction solar cell evaluation apparatus according to the present invention, and FIG. FIG. 4 is a diagram showing generation of electromotive force in a multijunction solar cell.

  The arrangement of the LEDs in the water-cooled LED unit 1 is such that four types of LEDs are repeatedly arranged in a row, and each row is divided into an upper row and a lower row, each forming a block composed of a plurality of LEDs of the same type. . FIG. 7 schematically shows a part of the LEDs arranged in a row of LED units, and shows eight LED blocks (8a × 2, 8b × 2, 8c × 2, 8d × 2). Yes.

  In the multi-junction solar cell evaluation device 20 according to the present invention, as shown in FIG. 9, pulse voltages as shown in FIG. 7 are applied to the LEDs 8 a to 8 d of the water-cooled LED units 1 constituting the test LED light source 23. Electrical output measurement for monitoring the output status (electromotive force) of the voltage application means 24 that sequentially applies with a predetermined time difference and the multijunction solar cell 22 that generates an electromotive force upon irradiation with light emitted from the LEDs 8a to 8d. An evaluation means 25 including a determination device for determining whether or not the device and the multi-junction solar cell 22 have failed is provided.

  Thus, in the present embodiment, a plurality of blocks corresponding to the test LED light source 23 and the multi-junction solar cell 22 (in this embodiment, the water-cooled LED unit 1 constituting the test LED light source 23 is 1 A module comprising 30 cells as a single cell), the application of a pulse voltage to each of the LEDs 8a to 8d by the voltage application means 24 and the failure of the multi-junction solar cell 22 by the determination device (evaluation means 25). The presence / absence determination is sequentially performed for each cell.

  As described above, V1 to V4 in which a pulse voltage is superimposed on a DC voltage as shown in FIG. 7 are applied to the LEDs 8a to 8d arranged in each of the water-cooled LED units 1 constituting the test LED light source 23 by the voltage application means 24. Sequentially applied with a predetermined time difference. In FIG. 10, the driving is sequentially performed by repeating the time T1.

  When no failure has occurred in the multi-junction solar cell 22, as shown by P in FIG. 10B, for example, V1, V2, V3, and V4 are applied corresponding to the light emission of the LED. The electromotive force P predicted from the applied pulse voltage is generated in the multi-junction solar cell 22 corresponding to the time (light emission time). The LED 8b is an ultraviolet ray, and is used mainly for evaluating the deterioration of the resin material used in the solar cell. Here, for simplification, it is assumed that no electromotive force is generated.

  At this time, when standardizing the electromotive force P obtained previously as a reference, for example, when a signal P2 having a reduced electromotive force in the time corresponding to the LED 8d is obtained, the sun having light emission sensitivity at the wavelength. It is determined that a failure exists in the battery.

  When the multi-junction solar cell 22 has two junctions, the spectral sensitivity characteristics of the element cells of the first layer and the second layer among the element cells are different. Therefore, the amount of current generated in any of the element cells is reduced due to the difference in spectral sensitivity corresponding to the LED 8d (wavelength 455 nm), and as a result, the electromotive force of the entire multijunction solar cell 22 is reduced. By examining the spectral sensitivities of the first layer and the second layer at a wavelength of 455 nm in advance, it is possible to determine which element cell has failed.

  Similarly, for example, when the electromotive force of the entire multi-junction solar cell 22 is reduced corresponding to the LED 8d (wavelength 455 nm), P1 in which the electromotive force of the time corresponding to V4 is reduced is obtained. In this case, it is possible to determine which element cell has failed.

  The location of the failed element cell by identifying the time during which the electromotive force is lowered by sequentially performing a series of procedures performed on these individual cells over all the cells constituting the module. And multi-junction element cells can be identified. Specifically, the region corresponding to which LED block in one module of the multijunction solar cell 22 by sequentially scanning the application of the pulse voltages V1 to V4 for each LED block shown in FIG. It is possible to specify whether or not a fault exists. Specifically, by comparing the electromotive forces P with each other or determining the above-described element cell failure, it is possible to specify the failure section within a range corresponding to the LED block.

  In this embodiment, since a plurality of water-cooled LED units 1 including the water-cooling unit 5 that cools the LEDs 8a to 8d are arranged as the test LED light source 23, variation in output characteristics of the LEDs 8a to 8d is suppressed. Therefore, the change in the output characteristics of the multi-junction solar cell 22 can be evaluated with high accuracy, and the failure location can be specified with a simple configuration.

  As described above, in the present embodiment, the test LED light source 23 and the multi-junction solar cell 22 are respectively divided into a plurality of corresponding blocks, and the voltage application means 24 applies the pulse voltage to each of the LEDs 8a to 8d. Since the evaluation unit 25 sequentially determines whether or not the multi-junction solar cell 22 has failed, for each block, the block (location) where the multi-junction solar cell 22 has failed and the element cell that has failed are displayed. Can be identified.

  In addition, arrangement | positioning on the board | substrate 9 of various LED8a-8d of each water-cooled LED unit 1 is not limited to what was shown in FIG. 7, It can set arbitrarily. Further, the emission wavelength and type of the LED are not limited to those described above, and can be arbitrarily set. For example, although LEDs of GaAlAs and GaN are used as the LEDs 8a to 8d, other crystal materials such as GaAlInP may be used, and wavelengths of GaN crystal and YAG phosphors may be used. You may use LED which consists of a combination with conversion material. LEDs 8a to 8d having different emission wavelengths can be obtained by making the LEDs 8a to 8d the same crystal material system, for example, GaN-based (GaInN, GaInAlN) and using different wavelength conversion materials. In the case of an LED having a different emission wavelength depending on the light emitting conversion material to be used, the junction temperature is almost the same because the LED elements themselves are of the same material system. Therefore, since the temperature characteristics of the LEDs 8a to 8d are the same, the variation in the luminous efficiency variation due to the temperature can be further reduced.

DESCRIPTION OF SYMBOLS 1 Water-cooled LED unit 2 Housing 3 Light source unit 4 Control circuit 5 Water-cooled unit 6 Intake port 7 Exhaust port 8a-8d LED
DESCRIPTION OF SYMBOLS 9 Board | substrate 10 Base 11 Lens 12 Circuit case 13 Cover 14 Radiation pin 15 Water cooling jacket 16 Radiator 17 Fan 18 Circulation pump 19 Reserve tank 20 Multijunction solar cell evaluation apparatus 21 Test room 22 Multijunction solar cell 23 LED light source for test 24 Voltage application Means 25 Evaluation means

Claims (4)

In a solar cell evaluation apparatus that evaluates the output characteristics of the solar cell by irradiating the solar cell with simulated sunlight from a test LED light source including a plurality of LEDs having different emission wavelengths,
Based on the voltage application means for sequentially applying a pulse voltage to each LED of the test LED light source with a predetermined time difference, and the output status of the solar cell that generates an electromotive force upon irradiation with light emitted from each LED A solar cell evaluation apparatus, comprising: a determination unit that determines the presence / absence and failure position of the solar cell.   2. The solar cell evaluation apparatus according to claim 1, wherein the test LED light source is configured by arranging a plurality of water-cooled LED units each having a plurality of LEDs having different emission wavelengths and a water-cooling unit for cooling the LEDs. .   The solar cell evaluation apparatus according to claim 1, wherein the solar cell is a multi-junction solar cell in which a plurality of element cells having different spectral sensitivities are stacked.   The test LED light source and the multi-junction solar cell are each divided into a plurality of corresponding blocks, and the application of a pulse voltage to each LED by the voltage application unit and the presence or absence of failure of the multi-junction solar cell by the determination unit 4. The solar cell evaluation apparatus according to claim 3, wherein the determination is sequentially performed for each block.

Images