WO2017090782A1

WO2017090782A1 - Concentrated solar cell module using single optical system

Info

Publication number: WO2017090782A1
Application number: PCT/KR2015/012579
Authority: WO
Inventors: 박기성; 박준희; 이길동; 김석태; 신선명; 박호산
Original assignee: 주식회사 지피
Priority date: 2015-11-23
Filing date: 2015-12-01
Publication date: 2017-06-01
Also published as: KR20170059674A; KR101851138B1

Abstract

A concentrated solar cell module using a single optical system is disclosed. The concentrated solar cell module according to one embodiment of the present invention comprises: a single optical system having regions divided into a plurality of concentrically circular shapes, and including a concentrating unit, which has a cross-sectional surface formed into a convex lens on the upper surface of each region and concentrates solar light, a reflection unit formed on the lower surface of each region so as to face the concentrating unit, thereby reflecting, in the direction of a center unit, the solar light concentrated by the concentrating unit, a groove unit formed at the upper part of the center unit and having an inverse conical-shaped lower part, and a prism unit formed at the lower part of the center unit so as to have an inverse trapezoidal shape by extending from the reflection unit; a central convex lens coupled to the groove unit of the single optical system, and including an upper part having a cross-sectional surface formed into a convex lens shape; and a solar cell disposed on the lower surface of the prism unit of the single optical system.

Description

Condensing solar cell module using single optical system

The present invention relates to a solar cell module, and more particularly, to a solar cell module for collecting and internally reflecting sunlight through a single optical system to deliver to the solar cell.

Among the renewable energy sources to replace existing fossil fuels, the most active research and development is the research of alternative energy sources using solar light. In particular, after fabricating a p-n junction diode using a silicon semiconductor (silicon-based solar cell), research on a planar solar cell module made by arranging it in a planar manner has been actively conducted. On the other hand, in addition to such a flat panel solar cell module in recent years by using an optical system such as a lens or a reflector to focus the sunlight at a high magnification, high efficiency group III-V compound having a smaller area than the flat silicon solar cell module Condensing solar cell modules that generate power by entering a semiconductor solar cell are attracting attention as the next generation photovoltaic module. This is because the light concentrating solar cell module has advantages of realizing high power generation efficiency and low manufacturing cost compared to the conventional flat panel solar cell module.

The condensing solar cell module may be classified into a refractive photovoltaic module and a reflective photovoltaic module according to a photovoltaic condensing method. The former collects sunlight using a Fresnel lens, while the latter collects sunlight using a parabolic reflector.

However, these concentrating solar cell modules, despite the advantages such as high power generation efficiency and low manufacturing cost, there were some limitations. First, since the condensing solar cell module uses a condensing optical system, only solar light incident perpendicularly to the condensing optical system is absorbed at the focal point of the solar cell. Therefore, there is a limit that the condensing solar cell module should always be installed on top of the tracking device moving along the sun. Second, when the sunlight is scattered by foreign matters such as clouds, fog, moisture in the air, dust, etc., there is a limit in which the solar cell cannot be focused. Third, in the light collecting optical system, the reflection loss of light occurs in the lens surface, and in order to reduce the light loss, the focal length needs to be increased, so that the thickness of the entire module has a limitation. A thicker module increases the overall size and weight of the module, increasing transportation, installation and maintenance costs.

Therefore, there have been attempts to overcome these limitations of the light concentrating solar cell module, and in particular, studies are being made to reduce the thickness of the module.

Embodiments of the present invention have a thickness thinner than the thickness of a conventional condensing type solar cell module, and to provide a condensing type solar cell module with a simplified structure compared to a condensing type solar cell module using two or more optical systems by using a single optical system. do.

According to an aspect of the present invention, a plurality of concentric circles are partitioned, the cross section is formed on the upper surface of each of the convex lens-shaped condensing unit for condensing sunlight and the condensing unit to face A reflecting portion formed on a lower surface of each region and reflecting the sunlight collected by the light collecting portion in a central portion direction; a groove portion formed on an upper portion of the central portion and having an inverted conical lower portion; A single optical system including a prism portion extending from the reflecting portion to have an inverted leg shape; A central convex lens coupled to a groove portion of the single optical system and having an upper portion formed in a convex lens shape in cross section; And a solar cell disposed on a lower surface of the prism unit of the single optical system.

According to another aspect of the present invention, having a plurality of concentric circularly divided regions, the upper surface of each region is formed in a convex lens-shaped cross-section and condensing sunlight, and to face the condensing portion A single optical system formed on a lower surface of each region and including a reflector configured to reflect the sunlight collected by the light collector in a direction of a central portion, and a groove formed in a polygon on the upper portion of the central portion; And a solar cell disposed on at least one surface of the groove portion such that the light receiving region is located outside the light collecting type solar cell module.

According to another aspect of the invention, having a region partitioned in the horizontal direction, the upper surface of each of the area is formed in a convex lens-shaped cross-section and condensing sunlight, and each facing so as to face the condenser A reflector formed on the lower surface of the region and reflecting the sunlight collected by the condenser in the direction of the center portion, a groove portion formed in a rod shape on the upper portion of the center portion and having a lower portion of an inverted triangular rod; A single optical system including a prism portion formed below to extend from the reflecting portion to have an inverted leg shape; A rod-shaped central convex lens coupled to the groove portion of the single optical system and having a top portion formed in a convex lens shape in cross section; And a light collecting solar cell module including a rod-shaped solar cell disposed on a lower surface of the prism unit of the single optical system.

According to another aspect of the invention, having a region partitioned in the horizontal direction, the upper surface of each of the area is formed in a convex lens-shaped cross-section and condensing sunlight, and each facing so as to face the condenser A single optical system formed on a lower surface of an area and including a reflector configured to reflect the sunlight collected by the light collector in one end direction; And a solar cell disposed on one side of the single optical system and receiving a solar light reflected from the reflector.

The light concentrating solar cell module according to the embodiments of the present invention implements an optical system for condensing and an optical system for reflection and guide of sunlight as a single optical system, thereby comparing the structure of the light concentrating solar cell module using two or more optical systems. Can be simplified. Therefore, it is possible to reduce the optical loss caused by the misalignment of the two optical systems that can occur when using two or more optical systems, and to reduce the manufacturing cost due to the process complexity.

In addition, the focus is adjusted according to the internal shape of the single optical system by the diameter difference of each region of the light condensing unit of the single optical system and the multi-stage shape of the reflecting unit corresponding thereto, thereby reducing the thickness of the entire light concentrating solar cell module. have.

1 is a view showing a cross section and an appearance of a light collecting solar cell module according to an embodiment of the present invention.

FIG. 2 is a view illustrating the light collecting solar cell module of FIG. 1 in a downward direction.

3 is a view conceptually showing how the central convex lens is coupled to a single optical system in the light collecting solar cell module of FIG. 1.

4 is an enlarged view illustrating a prism unit in the light collecting solar cell module of FIG. 1.

5 is an enlarged schematic view of portion A of FIG. 1.

6 is a conceptual diagram illustrating a state in which a plurality of light collecting solar cell modules of FIG. 1 are arranged.

7 is a view showing a cross section and an appearance of a light collecting solar cell module according to another embodiment of the present invention.

8 is a view showing a cross section and an appearance of a light collecting solar cell module according to another embodiment of the present invention.

9 is a view showing a cross section and an appearance of a light collecting solar cell module according to another embodiment of the present invention.

100, 200, 300, 400: condensing solar cell module

110, 210, 310, 410: single optical system

111, 211, 311, 411: condenser

112, 212, 312, 412: reflector

113, 313: groove

114, 314: prism section

120, 320: center convex lens

130, 230, 330, 430: solar cell

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. The following description should be understood to describe the present invention with specific examples, and the technical spirit of the present invention is not limited to the following description. And the accompanying drawings are provided to help understanding of the present invention, the technical spirit of the present invention is not limited to the accompanying drawings.

First embodiment

1 is a view showing a cross-sectional view and appearance of a light collecting solar cell module 100 according to an embodiment of the present invention, Figure 2 is a view showing the light collecting solar cell module 100 of Figure 1 in the downward direction. to be.

1 and 2, the light collecting solar cell module 100 is coupled to a single optical system 110 for condensing, reflecting and guiding sunlight and a single optical system 110 to provide sunlight to the solar cell 130. A central convex lens 120 to be incident to the light, and a solar cell 130 that absorbs the sunlight and converts it into electricity.

The single optical system 110 functions to collect, reflect, and guide sunlight. In the conventional condensing solar cell module, an optical system for condensing and an optical system for reflection existed separately, but in the condensing solar cell module 100 according to the present embodiment, condensing, reflection, and guide of sunlight through a single optical system 110 is performed. The difference is that it performs all the functions. Therefore, problems that may occur when two or more optical systems are provided, such as optical loss caused by misalignment of the two optical systems, condensation due to the air layer existing between the two optical systems, and process complexity occurring during the assembly of the two optical systems Problems do not occur.

The single optical system 110 may include a light collecting part 111, a reflecting part 112, a groove part 113, and a prism part 114. The single optical system 110 may be formed of poly (methyl) methacrylate (PMMA) or glass. These materials have a refractive index larger than that of air, and correspond to a material that does not have large light attenuation inside the material.

The condenser 111 is positioned on the single optical system 110 and has a plurality of concentric circularly partitioned regions, and a cross section may be formed in a convex lens shape on the upper surface of each region. That is, as illustrated in FIGS. 1 and 2, the light collecting part 111 may have a shape in which a plurality of donut-shaped members that are larger in size toward the outside are overlapped based on the same center point. In this case, the width of each region may vary, and specifically, the width of the region may increase as the width of the region increases. This is to maintain the same F number since the focal length changes according to the shape of the reflector 112, and a detailed description thereof will be described later. Meanwhile, a polygonal frame (not shown) forming an outer shape of the single optical system 110 may be formed at the outermost portion of the light collecting part 111. The condenser 111 may function to condense sunlight through the upper surface of the convex lens type for each predetermined section as described above. That is, the sunlight may be incident on each partition area of the light collecting part 111 and collected at each focal point. In addition, the upper surface of the light collecting portion 111 may be made of an anti-reflective coating to minimize the loss of sunlight.

The reflector 112 is formed on the lower surface of each region to face the light concentrator 111, and may function to reflect the sunlight collected by the light concentrator 112 toward the center portion. Herein, the central portion direction refers to the central portion of the single optical system 110 and may correspond to the groove portion 113 direction to be described later. At this time, the reflector 112 may be formed in a multi-stage having a predetermined step in the downward direction from the end to the central portion, for example, as shown in Figures 1 and 2 to have a stepped cross-sectional shape. Can be. That is, each surface of the reflector 112 may be sequentially positioned lower as the solar cell 130 gets closer. Therefore, sunlight reflected from each reflector 112 is not disturbed by other reflectors 112.

The stepped portion of the reflector 112 may be positioned to correspond to the focal position of the focused sunlight. Specifically, the stepped portion of the reflector 112 may have a reflective surface (denoted 112a in FIG. 2) inclined at approximately 45 ° near the focal length of the sunlight. In this case, the reflective surface may have a parabolic shape and specifically, may have a convex reflective surface or a concave reflective surface. A detailed description of the reflective surface will be described later with reference to other drawings. Meanwhile, a reflective surface coating may be formed on the rear surface of the reflective surface to more effectively reflect incident sunlight.

The groove 113 is formed on the central portion of the single optical system 110 and corresponds to a space to which the central convex lens 120 to be described later is coupled. The groove portion 113 may be formed in a cylindrical shape (or funnel type), and the lower part may be formed in an inverted cone shape (see FIGS. 1 and 2). 3, the central convex lens 120 is coupled to the single optical system 110. Referring to FIG. 3, the central convex lens 120 may be formed in a convex lens shape at an upper end surface thereof and may be formed in a planar shape at a lower end thereof. At this time, the width of the central convex lens 120 is formed to correspond to the width of the groove 113 of the single optical system 110, the center convex lens 120 can be fixed by fitting to the groove 113. At this time, it may be used with an adhesive such as UV epoxy for the bonding. After fitting the center convex lens 120, the lower portion of the groove 113 may be an empty space as shown in FIGS. 1 and 2 (inverted conical space). Solar light transmitted from the reflecting unit 112 in the empty space may be totally reflected to the prism unit 114.

The prism portion 114 is formed below the central portion of the single optical system 110 and may be formed to have an inverted leg shape extending from the reflecting portion 112. The lower area of the prism portion 114 may be the same as the area of the solar cell 130 to be described later. 4 shows an enlarged view of the prism portion 114 of FIG. 1. Referring to FIG. 4, the top surface of the prism portion 114 is formed in a circular shape, but the bottom surface may be formed in a quadrangular shape for bonding with the solar cell 130 (which means that the solar cell 130 generally has a rectangular shape). Because you are drunk). Therefore, the upper surface of the prism portion 114 to form a shape to gradually change from circular to square toward the lower surface, or as shown in Figure 4 the upper surface of the prism portion 114 from each surface of the solar cell 130 It may be formed in the form of cutting so that the parabolic surface appears (to the incision surface in Figure 4 a).

Referring back to FIGS. 1 and 2, the central convex lens 120 is coupled to the central portion of the single optical system 110, and specifically, may be coupled to the groove portion 113 of the single optical system 110. The central convex lens 120 may function to condense sunlight incident on the central portion of the single optical system 110, and may perform the function of injecting the condensed sunlight into the prism portion 114 positioned below. To this end, the central convex lens 120 may be formed in a convex lens-shaped cross section on its upper surface. When the central convex lens 120 is coupled to the groove portion 113 of the single optical system 110, the lower portion (inverted conical space) of the groove portion 113 may be an empty space.

The solar cell 130 may be disposed on the lower surface of the prism portion 114 of the single optical system 110. As described above, the lower area of the solar cell 130 and the prism portion 114 may be the same. The solar cell 130 may function to generate electrical energy by converting energy of sunlight incident through the single optical system 110 and the central convex lens 120 into electrical energy. The solar cell 130 may be a III-V compound semiconductor solar cell. Although not shown in the drawings, the solar energy incident to the solar cell 130 is converted into electrical energy by the action of an anode and a cathode electrode formed in the solar cell 130, the electrical energy is It may be transferred to the outside by the hybrid IC substrate disposed under the solar cell 130. Since the structure and electrical energy conversion process of the solar cell 130 or the hybrid IC substrate is well known, a detailed description thereof will be omitted. Meanwhile, the hybrid IC substrate may be made of alumina.

Hereinafter, a light collecting and reflecting process of the light collecting solar cell module 100 according to the present embodiment will be described in more detail.

5 is an enlarged schematic view of a portion A of FIG. 1. FIG. 5A shows a case where the stepped portion of the reflecting portion 112 has a convex reflecting surface 112a, and FIG. 5B shows a case where the stepped portion of the reflecting portion 112 has a concave reflecting surface 112b. have.

1 to 5, the sunlight L may be collected through the light collecting unit 111 of the single optical system 110. As described above, the light collecting part 111 has a predetermined partition area, and the sunlight L is incident on each of the partition areas and focused at each focal point (focus is indicated by P1 and P2 in FIG. 5). The sunlight L passing through the condenser 111 may be reflected by the stepped portion of the reflector 112 and converted into parallel light. Herein, the term “converted to parallel light form” means that the light L incident in the vertical direction with respect to the light concentrating solar cell module 100 is reflected by the reflector 112 and converted into the horizontal direction. The sunlight L may be reflected by the reflector 112 and travel toward the center of the single optical system 110 in the form of parallel light. At this time, as described above, the reflector 112 is formed in a multi-stage shape having a predetermined step in a downward direction from the end portion to the center portion, and the reflector 112 having different sunlight from each reflector 112 is different. Not disturbed by

At this time, as each surface of the reflector 112 is located closer to the solar cell 130 in order, the positions of the focal points (indicated by P1 and P2 in FIG. 5) for each preset partition area are Will be different. Specifically, the closer to the solar cell 130, the lower the position of the focal point. In relation to this, the position of the focal point can be adjusted through the F number. The F number is defined as the inverse of the aperture ratio of the lens or reflector. That is, in the present embodiment, the F number corresponds to a value obtained by dividing the focal length by the diameter of the upper convex lens-shaped shape (denoted as f2 in FIG. 1) of the condenser 111. Therefore, in order to maintain the F number for each predetermined region in the single optical system 110, as the focal length becomes longer, the diameter of the upper convex lens-shaped shape of the condenser 111 must also be increased by the same ratio. Therefore, the light collecting part 111 may be formed such that its width (referred to f2 in FIG. 1) becomes larger as it approaches the central part. As such, the diameter difference of each region of the light condensing unit 111 and the corresponding reflecting unit 112 are formed in a multi-stage shape having a predetermined step in the downward direction toward the center portion, and according to the internal shape of the single optical system 110. As the focus is adjusted, the thickness of the entire condensing solar cell module may be reduced, as compared with a different focal length depending on the incident position of the sunlight L. FIG.

As described above, the sunlight L may be reflected by the reflector 112, and specifically, may be reflected by the stepped portion of the reflector 112. In this case, the stepped portion may have a reflective surface (denoted 112a in FIG. 2) inclined at approximately 45 ° near the focal length of the sunlight, or may have a convex reflective surface 112a as in FIG. 5A. As shown in FIG. 5B, it may have a concave reflective surface 112b. At this time, when the reflective surface has a convex reflective surface 112a, the position of the reflective surface may be located higher than the focal position P1 of the collected sunlight L (see FIG. 5A), and When the slope has the concave reflecting surface 112b, the position of the reflecting surface may be located lower than the focus position P2 of the collected sunlight L (see FIG. 5B). Further, as the position of each reflecting surface moves away from the focus, the area of the reflecting surface becomes wider, and the closer to the focus, the narrower the reflecting surface area becomes.

Next, the sunlight L reflected by the reflector 112 may travel to the groove 113 in the horizontal direction. In this case, the sunlight L may cause total internal reflection at the interface with the space formed in the inverted cone shape below the groove portion 113, and may be transmitted to the prism portion 114. Subsequently, the sunlight L may pass through the prism portion 114 to the solar cell 130 disposed under the prism portion 114. Meanwhile, the sunlight L incident through the central convex lens 120 is collected at the convex lens surface, and then the reverse conical shape of the lower end of the central convex lens 120 and the groove 113 of the single optical system 110 is lowered. The light may be refracted while passing through the boundary, and finally transferred to the solar cell 130 via the prism portion 114.

In summary, the sunlight L is collected for each partition area of the light collecting part 111 and reflected by the reflecting part 112 to change the traveling direction, and then reflected in a space formed in an inverted cone shape below the groove part 113 to prism. The unit 114 and the solar cell 130 may be transferred. And the solar cell 130 functions to convert the energy of the received sunlight (L) to electrical energy.

The condensing solar cell module 100 as described above implements an optical system for condensing and an optical system for reflection and guide of sunlight into a single optical system (single optical system), thereby condensing solar cell modules using two or more optical systems. The structure can be simplified. Therefore, it is possible to reduce the optical loss caused by the misalignment of the two optical systems that can occur when using two or more optical systems, and to reduce the manufacturing cost due to the process complexity. In addition, the focus is adjusted according to the internal shape of the single optical system by the difference in diameter of each region of the condenser 111 of the single optical system 110 and the multi-stage shape of the reflecting unit 112 corresponding thereto. The thickness of the solar cell module can be reduced.

Meanwhile, the light collecting solar cell module 100 may be formed at the outermost part of the light collecting part 111 to form a polygonal frame (not shown) forming an external shape of the single optical system 110. In this case, when the polygonal frame is configured as a hexagon, the photovoltaic module array may be configured by connecting the plurality of concentrating solar cell modules 100 in a honeycomb structure. 6 is a conceptual diagram illustrating a state in which a plurality of light collecting solar cell modules 100 of FIG. 1 are arranged. In this case, there is an advantage that can be arranged more concentrating solar cell module 100 in the same space.

Second embodiment

Hereinafter, a second embodiment of the present invention will be described. 7 is a view illustrating a cross section and an appearance of a light collecting solar cell module 200 according to another embodiment (second embodiment) of the present invention.

Referring to FIG. 7, the light collecting solar cell module 200 may include a single optical system 210 for collecting, reflecting, and guiding sunlight, and a solar cell 230 for absorbing and converting sunlight into electricity. .

The single optical system 210 functions to collect, reflect, and guide sunlight. In the conventional condensing solar cell module, an optical system for condensing and an optical system for reflection existed separately, but in the condensing solar cell module 200 according to the present embodiment, the condensing, reflection, and guide of sunlight through a single optical system 210 is provided. The difference is that it performs all the functions. Therefore, problems that may occur when two or more optical systems are provided, such as optical loss caused by misalignment of the two optical systems, condensation due to the air layer existing between the two optical systems, and process complexity occurring during the assembly of the two optical systems Problems do not occur.

The single optical system 210 may include a light collecting unit 211, a reflecting unit 212, and a groove 213. The single optical system 110 may be formed of poly (methyl) methacrylate (PMMA) or glass. These materials have a refractive index larger than that of air, and correspond to a material that does not have large light attenuation inside the material.

The condenser 211 is positioned above the single optical system 210 and has a plurality of concentric circled regions, and a cross section may be formed in a convex lens shape on the upper surface of each region. That is, as shown in FIG. 7, the light collecting part 211 may have a shape in which a plurality of donut-shaped members that are larger in size toward the outside are overlapped with respect to the same center point. Meanwhile, a polygonal frame (not shown) may be formed at the outermost portion of the light collecting unit 211 to form an external shape of the single optical system 210.

The condenser 211 may function to condense the sunlight through the upper surface of the convex lens type for each predetermined section as described above. That is, the sunlight may be incident on each compartment of the light collecting unit 211 and collected at each focal point. In addition, the top surface of the light collecting part 211 may be coated with an anti-reflective coating so as to minimize the loss of sunlight.

The reflecting unit 212 is formed on the lower surface of each region to face the light collecting unit 211, and may function to reflect the sun light collected by the light collecting unit 212 toward the center portion. Herein, the central direction refers to the central portion of the single optical system 210 and may correspond to the direction of the groove 213 which will be described later. At this time, the reflecting unit 212 may be formed in a multi-stage having a predetermined step in the downward direction from the end to the center portion, for example, may be formed so that the cross section has a stepped shape as shown in FIG. In addition, each surface of the reflector 212 may be formed to be inclined at a predetermined angle toward the groove 213.

The stepped portion of the reflector 212 may be positioned to correspond to the focal position of the focused sunlight. Specifically, the stepped portion of the reflector 212 may have a reflective surface (denoted 212a in FIG. 7) inclined at approximately 45 ° near the focal length of the sunlight. In this case, the reflective surface may have a parabolic shape and specifically, may have a convex reflective surface or a concave reflective surface. Reflecting surface coating may be formed on the rear surface of the reflecting surface to more effectively reflect incident sunlight.

The groove 213 is formed in the center of the single optical system 210 and may be formed in a polygonal shape (eg, a square pillar). At this time, the solar cell 230 may be disposed on at least one surface of the groove portion 213 so that the light receiving region is located outside. In other words, unlike the above-described embodiment, the solar cell 230 is disposed in the vertical direction. In relation to FIG. 7, two solar cells 230 are disposed on each side of the groove 213 one by one. Since the solar cell 230 is the same as or similar to the above-described embodiment, a redundant description thereof will be omitted.

Referring to the solar light collecting and reflecting process in the light collecting solar cell module 200 according to the present embodiment as described above, first, the light L is through the light collecting part 211 of the single optical system 210. Can be condensed. The sunlight L passing through the light collecting unit 211 may be reflected by the stepped portion of the reflecting unit 212 so that the traveling direction may be changed, and specifically, the traveling direction may be converted so as to face the groove 213. Can be. The reflected sunlight L may be transmitted to the solar cell 230 disposed on each side of the groove. The solar cell 230 converts the energy of the received sunlight L into electrical energy. In other words, unlike the above-described embodiment, the present embodiment may be configured such that the central convex lens or the prism part is omitted and the solar cell 230 is directly disposed in the groove part 213.

Third embodiment

Hereinafter, a third embodiment of the present invention will be described. 8 is a view showing a cross section and an appearance of a light collecting solar cell module 300 according to another embodiment (third embodiment) of the present invention.

Referring to FIG. 8, the light concentrating solar cell module 300 is coupled to a single optical system 310 for condensing, reflecting and guiding sunlight, and is incident on the solar cell 330 by being coupled to a single optical system 310. The central convex lens 320 and a solar cell 330 that absorbs sunlight and converts it into electricity.

The single optical system 310 functions to collect, reflect, and guide sunlight. In the conventional condensing solar cell module, an optical system for condensing and an optical system for reflection existed separately, but in the condensing solar cell module 300 according to the present embodiment, the condensing, reflection, and guide of sunlight through a single optical system 310 is provided. The difference is that it performs all the functions. Therefore, problems that may occur when two or more optical systems are provided, such as optical loss caused by misalignment of the two optical systems, condensation due to the air layer existing between the two optical systems, and process complexity occurring during the assembly of the two optical systems Problems do not occur.

The single optical system 310 may include a light collecting part 311, a reflecting part 312, a groove part 313, and a prism part 314. The single optical system 110 may be formed of poly (methyl) methacrylate (PMMA) or glass. These materials have a refractive index larger than that of air, and correspond to a material that does not have large light attenuation inside the material.

The condenser 311 is positioned above the single optical system 110 and has a region partitioned in the horizontal direction, and a cross section may be formed in a convex lens shape on the upper surface of each region. That is, as shown in FIG. 8, the light collecting part 311 may have a shape in which a plurality of rod-shaped members having a convex shape on the top thereof are arranged in one direction. In this case, the width of each region may vary, and specifically, the width of the region may be increased from the outside to the center portion. Meanwhile, a polygonal frame (not shown) may be formed at the outermost portion of the light collecting part 311 to form an external shape of the single optical system 310. The condenser 311 may function to condense the sunlight through the upper surface of the convex lens type for each predetermined section as described above. That is, the sunlight may be incident on each compartment of the light collecting unit 311 and collected at each focal point. In addition, the top surface of the light collecting part 311 may be made of an anti-reflection coating so as to minimize the loss of sunlight.

The reflector 312 is formed on the lower surface of each region to face the light concentrator 311, and may function to reflect the sunlight collected by the light concentrator 312 toward the center portion. Herein, the central direction refers to the central portion of the single optical system 310, and specifically, may correspond to the direction of the groove 313 to be described later. In this case, the reflector 312 may be formed in a multi-stage shape having a predetermined step in a downward direction from the end portion to the center portion, for example, may be formed so that the cross section has a stepped shape as shown in FIG. 8. That is, each surface of the reflector 312 may be sequentially positioned lower as the solar cell 330 gets closer. Therefore, sunlight reflected from each reflector 312 is not disturbed by the other reflector 312.

The stepped portion of the reflector 312 may be positioned to correspond to the focal position of the focused sunlight. Specifically, the stepped portion of the reflector 312 may have a reflective surface (denoted 312a in FIG. 8) inclined at approximately 45 ° near the focal length of the sunlight. In this case, the reflective surface may have a parabolic shape and specifically, may have a convex reflective surface or a concave reflective surface. This is the same as in the above-described embodiment (first embodiment) bar overlapping description will be omitted. Meanwhile, a reflective surface coating may be formed on the rear surface of the reflective surface to more effectively reflect incident sunlight.

The groove 313 is formed above the central portion of the single optical system 310 and corresponds to a space where the central convex lens 320 is coupled. Unlike the above-described embodiment (first embodiment), the groove portion 113 in the present embodiment may be formed in a long rod shape, the lower portion may be formed in an inverted triangle bar shape.

The prism portion 314 is formed below the central portion of the single optical system 310 and extends from the reflecting portion 312 and may be formed in a rod shape having an inverted leg cross section. The lower area of the prism portion 314 may be equal to the area of the solar cell 330.

The central convex lens 320 is coupled to the central portion of the single optical system 310, and specifically, may be coupled to the groove 313 of the single optical system 310. The central convex lens 320 may function to condense the sunlight incident on the central portion of the single optical system 310, and may allow the condensed sunlight to enter the prism portion 314 located below. To this end, the central convex lens 320 may be formed in a convex lens-shaped cross section on its upper surface and may be formed in a bar shape as a whole. When the central convex lens 320 is coupled to the groove portion 313 of the single optical system 310 (by using an adhesive such as fitting bonding or UV epoxy), the lower portion of the groove portion 313 (cross-section is an inverted triangle space) is empty. Can be.

The solar cell 330 may be disposed on the lower surface of the prism portion 314 of the single optical system 310, and may be formed in a rod shape. Since the solar cell 330 is the same as or similar to the above-described embodiment, redundant description thereof will be omitted.

Referring to the solar light collecting and reflecting process in the light collecting solar cell module 300 according to the present embodiment as described above, first, the sunlight L is collected through the light collecting part 311 of the single optical system 310. Can be condensed. As described above, the light collecting unit 311 has predetermined partition regions, and the sunlight L is incident on the partition regions and focused at each focal point. The sunlight L passing through the light collecting unit 311 may be reflected by the stepped portion of the reflecting unit 312 to be converted into a parallel light form and proceed to the center portion of the single optical system 310. Next, the sunlight L reflected by the reflector 312 may proceed to the groove 313 in the horizontal direction. In this case, the sunlight L may cause total internal reflection at an interface with a space formed in an inverted triangular bar shape below the groove part 313, and thus may be transmitted to the prism part 314. Subsequently, the sunlight L may be transmitted to the solar cell 330 disposed under the prism portion 314 after passing through the prism portion 314. Meanwhile, after the sunlight L incident through the central convex lens 320 is collected at the convex lens surface, the reverse triangular type of the lower end of the central convex lens 320 and the groove 313 of the single optical system 310 is lowered. The light may be refracted while passing through the boundary, and finally transferred to the solar cell 330 via the prism portion 314.

In summary, the sunlight L is collected for each partition area of the light collecting part 311, is reflected by the reflecting part 312, and the traveling direction is changed, and is reflected in a space formed in an inverted triangular shape below the groove part 313. It may be transferred to the prism portion 314 and the solar cell 330. In addition, the solar cell 330 converts the energy of the received sunlight L into electrical energy.

Fourth embodiment

Hereinafter, a fourth embodiment of the present invention will be described. 9 is a view illustrating a cross section and an appearance of a light collecting solar cell module 400 according to another embodiment (fourth embodiment) of the present invention.

Referring to FIG. 9, the light collecting solar cell module 400 is disposed on one side of a single optical system 410 for collecting, reflecting, and guiding sunlight, and absorbs sunlight and converts it into electricity. It may include a solar cell 430.

The single optical system 410 functions to collect, reflect, and guide sunlight. In the conventional condensing solar cell module, an optical system for condensing and an optical system for reflection existed separately, but in the condensing solar cell module 400 according to the present embodiment, condensing, reflection, and guide of sunlight through a single optical system 410 is performed. The difference is that it performs all the functions. Therefore, problems that may occur when two or more optical systems are provided, such as optical loss caused by misalignment of the two optical systems, condensation due to the air layer existing between the two optical systems, and process complexity occurring during the assembly of the two optical systems Problems do not occur.

The single optical system 410 may include a light collecting part 411 and a reflecting part 412. The single optical system 410 may be formed of poly (methyl) methacrylate (PMMA) or glass. These materials have a refractive index larger than that of air, and correspond to a material that does not have large light attenuation inside the material.

The condenser 411 is positioned above the single optical system 410 and has a region partitioned in the horizontal direction, and a cross section may be formed in a convex lens shape on the upper surface of each region. That is, as shown in FIG. 9, the light collecting part 411 may have a shape in which a plurality of rod-shaped members having a convex shape on the top thereof are arranged in one direction. In this case, the width of each region may vary, and specifically, the width of the region may be increased so as to come closer to the portion farther from the solar cell 410. Meanwhile, a polygonal frame (not shown) may be formed at the outermost portion of the light collecting part 411 to form an external shape of the single optical system 410. The condenser 411 may function to condense sunlight through the upper surface of the convex lens type for each predetermined section as described above. That is, the sunlight may be incident on each partition area of the light collecting part 411 and collected at each focal point. In addition, the upper surface of the light collecting portion 411 may be made of an anti-reflective coating to minimize the loss of sunlight.

The reflector 412 is formed on the lower surface of each region to face the light concentrator 411 and may function to reflect the sunlight collected by the light concentrator 412 toward the solar cell 430. . At this time, the reflector 412 may be formed in a multi-stage having a predetermined step in the downward direction as coming closer to the portion farther from the solar cell 410, for example, as shown in Figure 9 cross-section It may be formed to have. That is, each surface of the reflector 412 may be located further down sequentially as the solar cell 430 gets closer. Therefore, the sunlight reflected from each reflector 412 is not disturbed by the other reflector 412.

The stepped portion of the reflector 412 may be positioned to correspond to the focal position of the focused sunlight. Specifically, the stepped portion of the reflector 412 may have a reflective surface (denoted 412a in FIG. 9) inclined at approximately 45 ° near the focal length of the sunlight. In this case, the reflective surface may have a parabolic shape and specifically, may have a convex reflective surface or a concave reflective surface. This is the same as in the above-described embodiment (the first embodiment, the third embodiment) bar overlapping description will be omitted. Meanwhile, a reflective surface coating may be formed on the rear surface of the reflective surface to more effectively reflect incident sunlight.

The solar cell 430 may be disposed on one side of the single optical system 410, and may be formed in a rod shape. Since the solar cell 430 is the same as or similar to that of the above-described embodiment, redundant description thereof will be omitted.

Referring to the solar light collecting and reflecting process in the light collecting solar cell module 400 according to the present embodiment as described above, first, the light L is collected through the light collecting part 411 of the single optical system 410. Can be condensed. As described above, the light collecting part 411 has predetermined partitioned areas and sunlight L is incident on the partitioned areas and is focused at each focal point. The sunlight L passing through the condenser 411 may be reflected by the stepped portion of the reflector 412, converted into parallel light, and transmitted to the solar cell 430. The solar cell 430 converts the energy of the received sunlight L into electrical energy.

In the above, this invention was demonstrated concretely. However, those skilled in the art to which the present invention pertains, within the scope of the technical spirit of the present invention described in the claims, simple design changes, omission of some components, simple use changes, etc. It will be apparent that the present invention may be modified in various ways, and such modifications are also included within the scope of the present invention.

Claims

It has a plurality of concentric circularly divided regions, the upper surface of each of the regions are formed in a convex lens-shaped cross-section condensing sunlight and formed on the lower surface of each region to face the condensing portion A reflecting portion for reflecting the sunlight collected by the condensing portion toward a central portion, a groove portion formed at an upper portion of the central portion and having an inverted conical lower portion, and an inverted leg extending from the reflecting portion at the lower portion of the central portion; Single optical system including a prism portion formed to have a;

A central convex lens coupled to a groove portion of the single optical system and having an upper portion formed in a convex lens shape in cross section; And

Condensing solar cell module comprising a solar cell disposed on the lower surface of the prism portion of the single optical system.
It has a plurality of concentric circularly divided regions, the upper surface of each of the regions are formed in a convex lens-shaped cross-section condensing sunlight and formed on the lower surface of each region to face the condensing portion A single optical system including a reflection part reflecting the sunlight collected by the light collecting part toward a center part, and a groove part formed in a polygon on an upper part of the center part; And

Condensing solar cell module comprising a solar cell disposed on at least one surface of the groove portion so that the light receiving area is located outside.
A region partitioned in a horizontal direction, having a convex lens-shaped cross section at an upper surface of each region, and a light collecting portion for collecting solar light, and a lower surface of each region to face the light collecting portion; A reflecting portion for reflecting the sunlight collected by the mining portion toward the center portion, a groove portion formed in a rod shape on the upper portion of the central portion and having a lower portion of an inverted triangular rod, and extending from the reflecting portion on the lower portion of the central portion. A single optical system including a prism portion formed to have a leg shape;

A rod-shaped central convex lens coupled to the groove portion of the single optical system and having a top portion formed in a convex lens shape in cross section; And

Condensing solar cell module comprising a rod-shaped solar cell disposed on the lower surface of the prism portion of the single optical system.
A region partitioned in a horizontal direction, having a convex lens-shaped cross section at an upper surface of each region, and a light collecting portion for collecting solar light, and a lower surface of each region to face the light collecting portion; A single optical system including a reflector for reflecting the sunlight collected by the light unit in one end direction; And

Condensing solar cell module comprising a solar cell disposed on one side of the single optical system for receiving the sunlight reflected from the reflecting portion.
The method according to any one of claims 1 to 4,

The reflecting unit of the single optical system is formed in a multi-stage type having a predetermined step in the downward direction from the end portion to the center portion,

And the stepped portion is positioned to correspond to a focal position of the focused solar light and is formed to have a convex reflection surface or a concave reflection surface to reflect the sunlight.
The method according to claim 5,

Condensing solar cell module made of a reflective film coating on the lower surface of the stepped portion.
The method according to claim 5,

When the stepped portion is formed to have a convex reflecting surface, the stepped portion is located above the focal position of the sunlight, and when the stepped portion is formed to have a concave reflective surface, the stepped portion is less than the focal position of the sunlight. Condensing solar cell module located at the bottom.
The method according to claim 5,

The reflecting surface of the stepped portion is a condensing solar cell module is formed so that the area is wider the farther away from the focal position of the sunlight, the narrower the area is closer.
The method according to claim 1 or 3,

The prism portion has a condensed solar cell module having a form cut so that the parabolic surface appears from each surface of the solar cell to the upper surface of the prism portion.
The method according to any one of claims 1 to 4,

The single optical system is a condensing solar cell module formed of PMMA (Poly (methyl) methacrylate) or glass.