KR20100048276A - Apparatus for solar power generation and device for concentrating light - Google Patents

Abstract

PURPOSE: An apparatus for generating solar power and an apparatus for concentrating light are provided to adjust the light concentration ratio by controlling the area of the incident and exit surfaces of a light concentration unit. CONSTITUTION: A light concentration unit(200) in a wedge shape includes an incident surface(211) and an exit surface. The area of the exit surface is smaller than the incident surface. Solar cells(301, 302) are arranged on the exit surface. The light concentration unit includes a guide unit(210) and a light radiation unit(220). Concentrated light is transferred to the guide unit. The guide unit guides the light to the light radiation unit. The light concentration ratio is controlled by adjusting the area of the incident surface and the exit surface.

Description

Photovoltaic Power Generation Device and Condenser {APPARATUS FOR SOLAR POWER GENERATION AND DEVICE FOR CONCENTRATING LIGHT}

Embodiments relate to a photovoltaic device and a light collecting device.

Recently, as the demand for energy increases, development of solar cells converting solar energy into electrical energy and photovoltaic devices using the same are in progress.

In order to inject sunlight into the solar cells, the solar cells may be exposed to the outside. At this time, the solar cells exposed to the outside may be damaged.

In addition, these photovoltaic devices should be able to have improved power generation efficiency.

Embodiments provide a solar cell apparatus capable of disposing a solar cell at a desired location and having improved power generation efficiency.

In one embodiment, a photovoltaic device includes a light collecting member including an incident surface and an emission surface having a smaller area than the incident surface; And a solar cell disposed on the emission surface.

Photovoltaic device according to an embodiment includes a first light collecting member that primarily collects sunlight; A second condensing member which receives and guides the primary condensed light and condenses and emits the secondary condensed light; And a solar cell that receives the second focused light and converts the light into electrical energy.

In one embodiment, a light collecting device includes: an incident surface; And an emission surface having an area smaller than the entrance surface, and guides the light incident through the entrance surface by total reflection, and emits the light through the emission surface.

The solar cell apparatus according to the embodiment includes a light collecting member having an incident surface and an exit surface. By the light collecting member, incident sunlight can be guided. Therefore, the light collecting member may be designed such that the solar cell is disposed at a desired position, and the solar cell may be disposed at a desired position.

In addition, the solar cell apparatus according to the embodiment can adjust the light collecting efficiency by adjusting the area of the incident surface and the exit surface of the light collecting member. Accordingly, the photovoltaic device according to the embodiment can adjust the concentration ratio of the solar light so that the solar cell has the maximum power generation efficiency.

In addition, the photovoltaic device according to the embodiment is generated by condensing sunlight to generate power using a small area solar cell.

In the description of the embodiment, each lens, member, battery, film, surface, or pattern is formed on or under the lens, battery, film, surface, member, or pattern of the "on" or "under". When described as being "in" and "under" includes both those that are formed "directly" or "indirectly" through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view showing a photovoltaic device according to an embodiment. 2 is a side view of the solar cell apparatus according to the embodiment. 3 is an enlarged cross-sectional view of a cross section of the exit unit.

1 to 3, the photovoltaic device according to the embodiment includes a light collecting lens 100, a light guide light collecting member 200, solar cells 301 and 302, and a power storage device 400.

The condenser lens 100 is a cylindrical lens extending in the first direction. The condenser lens 100 condenses sunlight primarily.

The condenser lens 100 includes, for example, a convex upper surface and a flat lower surface. The condenser lens 100 may condense sunlight by about 30 to 1200 times.

Examples of the material used for the condensing lens 100 may include glass or plastic.

In addition, the condenser lens 100 may be a Fresnel lens or a convex lens. In addition, instead of the condenser lens 100, a mirror for condensing light may be used. That is, the condenser lens 100 is not limited to the lens, and various members may be used in place of the condenser lens 100 to condense the primary light.

The light guide light collecting member 200 is disposed below the light collecting lens 100. The light guide light collecting member 200 and the light collecting lens 100 are spaced apart from each other.

The light guide condensing member 200 condenses the light emitted by the first condensing by the condensing lens 100 to the second condensing. In more detail, the light guide light collecting member 200 guides and condenses the primary focused light and emits the light.

The light guide light collecting member 200 has a wedge shape. For example, the light guide light collecting member 200 has a shape extending in the first direction. Examples of the material used as the light guide light collecting member 200 include glass, quartz or plastic. In more detail, examples of the material used as the light guide light collecting member 200 include polycarbonate (PC) or polymethylmethacrylate (PMMA).

The refractive index of the light guide light collecting member 200 may be, for example, 1.4 to 1.6.

The light guide light collecting member 200 includes a guide part 210 and a light exit part 220.

The guide part 210 receives the first focused light and guides the light to the light exiting part 220. The guide part 210 includes an incident surface 211 and total reflection surfaces 212 and 213.

The incident surface 211 faces the condenser lens 100. That is, the incident surface 211 faces the condensing lens 100. In addition, the incident surface 211 may be parallel to the image plane of the condensing lens 100.

In addition, the focal point of the condenser lens 100 may be located on the incident surface 211, located on the incident surface 211, or below the incident surface 211.

In addition, the width of the incident surface 211 may correspond to the aberration of the condensing lens 100. That is, by the condenser lens 100, the light primarily collected is not concentrated at one point, and a slight error may occur, and this error corresponds to the aberration. Therefore, the width of the incident surface 211 corresponds to or is greater than the aberration of the condensing lens 100. Accordingly, the light guide light collecting member 200 may receive the primary focused light efficiently.

An antireflection film 211 is disposed on the incident surface 211. In more detail, the anti-reflection film 211 is coated on the incident surface 211. The anti-reflection film 211 improves light incidence efficiency and reduces reflectance.

The anti-reflection film 211 is transparent and has a refractive index smaller than that of the light guide light collecting member 200.

Unlike this, instead of the anti-reflection film 211, an anti-reflection pattern may be formed on the incident surface 211.

The antireflection pattern may be an embossing pattern having a diameter of about 150 to 250 nm.

The total reflection surfaces 212 and 213 extend downward from the incident surface 211. The total reflection surfaces 212 and 213 are inclined with respect to the incident surface 211. The angle between the total reflection surfaces 212 and 213 and the incident surface 211 is an acute angle.

In addition, the total reflection surfaces 212 and 213 are two and face each other. The angle between the total reflection surfaces 212 and 213 may be about 1 to 35 degrees. That is, the total reflection surfaces 212 and 213 extend in directions crossing each other. That is, the guide portion 210 has a tapered shape.

The angle between the total reflection surfaces 212 and 213 is determined by the light passing through both ends of the condenser lens 100. That is, the total reflection surfaces 212 and 213 are inclined such that light passing through both ends of the condenser lens 100 is incident on the light guide condenser member 200 and totally reflected therein. Accordingly, the angle between the total reflection surfaces 212 and 213 is determined.

Light incident through the incident surface 211 is totally reflected by the total reflection surfaces 212 and 213 and is collected. That is, as it goes down, the interval between the total reflection surfaces 212 and 213 becomes narrower, and accordingly, the incident light is secondly focused.

The guide portion 210 may be gently bent. That is, the total reflection surfaces 212 and 213 may also be gently bent. In this case, the total reflection surfaces 212 and 213 may be bent enough to totally reflect incident light.

The light exit part 220 is disposed below the guide part 210. The light exit part 220 is integrally formed with the guide part 210. The light exit portion 220 has a triangular prism shape extending in the first direction.

The light emitter 220 includes emission surfaces 221 and 222. Light incident through the incident surface 211 is emitted through the emission surfaces 221 and 222. Scattering patterns 223 are formed on the exit surfaces 221 and 222.

That is, the light incident on the light guide light collecting member 200 is totally reflected by the total reflection surface, guided by the guide part 210, and collected and incident on the light exiting part 220. Thereafter, the light incident on the light exiting part 220 is scattered by the scattering pattern 223 and is emitted through the emission surfaces 221 and 222.

The exit surfaces 221 and 222 are disposed on the same plane as the total reflection surfaces 212 and 213. The exit surfaces 221 and 222 intersect with each other, and the angle between the exit surfaces 221 and 222 is about 1 to 35 degrees.

The sum of the areas of the exit surfaces 221 and 222 is smaller than the area of the incident surface 211. For example, the area of the incident surface 211 is about 30 to 1200 times the sum of the areas of the exit surfaces 221 and 222. That is, assuming that there is no light loss, the light guide light collecting member 200 may secondly condense the first focused light by about 30 to 1200 times.

That is, the area of the incident surface 211 and the areas of the exit surfaces 221 and 222 may be adjusted to adjust the light condensing ratio of the light guide light collecting member 200.

The solar cells 301 and 302 are disposed on the emission surfaces 221 and 222, respectively. They are two and face each other. The solar cells 301 and 302 have planar areas corresponding to the exit surfaces 221 and 222.

Alternatively, the planar areas of the solar cells 301 and 302 may be wider than the planar areas of the exit surfaces 221 and 222.

The solar cells 301 and 302 receive the second concentrated light emitted through the emission surface and convert the incident light into electrical energy. The solar cells 301 and 302 may include a silicon substrate having a pn junction. Alternatively, the solar cell may include a CIGS-based semiconductor layer. That is, the solar cells 301 and 302 may be, for example, CIGS solar cells, silicon solar cells, fuel-sensitized solar cells, II-VI compound semiconductor solar cells, or III-V compound semiconductor solar cells. Can be.

The electrical storage device 400 stores electrical energy generated from the solar cells 301 and 302. The power storage device 400 may include a circuit for rectifying the electrical energy.

Sunlight is primarily focused by the condenser lens 100. Thereafter, the first focused light is incident through the incident surface 211, guided by the guide part 210, and then incident on the light exiting part 220.

Thereafter, the guided light through the exit surfaces 221 and 222 is secondly focused and emitted.

The condensing magnification of each of the condenser lens 100 and the light guide condensing member 200 is adjusted, so that sunlight can be condensed at about 30 to 1200 times.

In addition, the condensing magnification of the condenser lens 100 and the light guide condensing member 200 may be determined by the ratio of the area of the bottom surface of the condenser lens 100 and the planar area of the solar cells 301 and 302. have.

In the solar cell apparatus according to the embodiment, the condensing lens 100 and the light guide condensing member 200 may condense sunlight at a desired ratio.

The solar cells 301 and 302 have maximum conversion efficiency when light of a certain intensity is incident. For example, the solar cell may have the maximum conversion efficiency when light having an intensity of about 29 to 31 times the general sunlight is incident.

In this case, the photovoltaic device according to the embodiment may collect the sunlight by the condenser lens 100 and the light guide condensing member 200 so that the solar cell has the maximum conversion efficiency.

In addition, the light guide light collecting member 200 guides and condenses the light by total reflection. Accordingly, the light guide light collecting member 200 may reduce light loss than a device for collecting light using the reflective member.

Therefore, the solar cell apparatus according to the embodiment has improved power generation efficiency.

In addition, the photovoltaic device according to the embodiment generates power by condensing sunlight, and thus can be generated using a small area solar cell.

In addition, since the light guide light collecting member 200 guides and collects the primary focused light, the solar cells 301 and 302 may be disposed at a desired position.

That is, the light guide light collecting member 200 may be gently bent. In addition, the emission surfaces 221 and 222 may be formed at different positions depending on the shape of the light guide light collecting member 200. Therefore, the solar cell apparatus according to the embodiment may arrange the solar cells 301 and 302 indoors.

Thus, the solar cells 301 and 302 may not be exposed to the outside. Thus, the solar cells 301 and 302 can be protected from external physical and chemical shocks. therefore. The solar cell apparatus according to the embodiment has improved durability.

4 to 7 are cross-sectional views illustrating light emitters and solar cells according to another exemplary embodiment. In the present embodiment, the light emitting unit and the solar cells will be further described with reference to the above-described embodiment.

Referring to FIG. 4, the light exiting unit 230 has a square pillar shape extending in the first direction. In this case, the cross section of the light exit portion 230 may have a square or rectangular shape.

In addition, the light exit unit 230 includes three exit surfaces 231, 232, and 233. A scattering pattern may be formed on the exit surfaces 231, 232, and 233. For example, the exit surfaces 231, 232, and 233 may be referred to as a first exit surface 231, a second exit surface 232, and a third exit surface 233.

In this case, the first exit surface 231 and the third exit surface 233 face each other, and the second exit surface 232 faces the entrance surface.

In addition, a relatively large amount of light is emitted through the second emission surface 232.

One solar cell 303 is disposed on the emission surfaces 231, 232, and 233, respectively.

Alternatively, one solar cell may cover the emission surfaces 231, 232, and 233 in a shape bent to correspond to the light exiting unit 230.

Since the second emission surface 232 faces the incident surface, light incident through the incident surface is guided to be perpendicular to the second emission surface 232.

Therefore, the amount of light reflected with respect to the second emission surface 232 can be reduced, and accordingly, the amount of light reflected upwardly can be reduced.

Therefore, the light collecting member according to the present embodiment can efficiently collect incident light.

Referring to FIG. 5, the light emitter 240 may have a square pillar shape extending in the first direction. In addition, the cross section of the light exit portion 240 has a trapezoidal shape.

The light emitter 240 includes three exit surfaces 241, 242, and 243. The exit surfaces 241, 242, and 243 may be referred to as a fourth exit surface 241, a fifth exit surface 242, and a sixth exit surface 243.

The fourth exit surface 241 and the sixth exit surface 243 intersect the total reflection surface. In addition, the fourth emission surface 241 and the sixth emission surface 243 face each other and extend in a direction crossing each other.

The fourth exit surface 241 and the sixth exit surface 243 intersect the fifth exit surface 242 and are inclined to the fifth exit surface 242. In more detail, the fourth exit surface 241 and the sixth exit surface 243 form an acute angle with the fifth exit surface 242.

The fifth emission surface 242 is parallel to the incident surface 211.

Similarly, solar cells 303 are disposed on the emission surfaces 241, 242, and 243, respectively.

The light collecting member according to the present exemplary embodiment may efficiently emit light through the fifth emission surface 242.

In addition, since the fourth emission surface 241 and the sixth emission surface 243 form an acute angle with the fifth emission surface 242, the light reflected by the fifth emission surface 242 is reflected in the fourth emission surface 242. It may be emitted through the exit surface 241 and the sixth exit surface (243).

Therefore, the light collecting member according to the present embodiment can reduce the amount of light reflected and leaked upward, and can efficiently collect incident light.

Referring to FIG. 6, the light exit part 250 may have an octagonal pillar shape extending in a first direction.

Accordingly, the light exit part 250 has seven exit surfaces 251.

Likewise, solar cells 303 may be disposed on each of the emission surfaces 251, or one solar cell may surround the emission surfaces 251.

Referring to FIG. 7, the light emitter 260 may have a circular columnar shape extending in a first direction.

At this time, the outer circumferential surface 261 of the light exit part 260 becomes an exit surface.

In this case, the outer circumferential surface 261 of the light exiting part 220 is wrapped by the solar cell 304.

6 and 7, the area of the portion where the light output part 250 or 260 and the guide part 210 are connected may be reduced. Accordingly, the amount of light leaking from the light exit part 250 or 260 to the guide part 210 may be reduced.

Thus, the light collecting member according to the present embodiments can efficiently collect incident light.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is an exploded perspective view showing a photovoltaic device according to an embodiment.

2 is a side view of the solar cell apparatus according to the embodiment.

3 is an enlarged cross-sectional view of a cross section of the exit unit.

4 to 7 are cross-sectional views illustrating light emitters and solar cells according to another exemplary embodiment.

Claims (16)

A light collecting member including an incident surface and an emission surface having an area smaller than the incident surface; And Photovoltaic device comprising a solar cell disposed on the exit surface. The photovoltaic device of claim 1, wherein the light collecting member guides the light incident through the incident surface by total reflection to emit the light through the emission surface. The solar cell apparatus of claim 1, wherein the light collecting member has a tapered shape. The photovoltaic device of claim 1, further comprising an antireflection film or an antireflection pattern formed on the incident surface. The solar cell apparatus of claim 1, wherein the light collecting member comprises a first total reflection surface inclined with respect to the incident surface and a second total reflection surface facing the first total reflection surface. The photovoltaic device of claim 5, wherein an angle between the first total reflection surface and the second total reflection surface is about 1 to 35 °. The solar cell apparatus according to claim 5, wherein the emission surface is inclined with the first total reflection surface or the second electric reflection surface. The solar cell apparatus of claim 1, wherein a scattering pattern is formed on the emission surface. A first condensing member for condensing sunlight primarily; A second condensing member which receives and guides the primary condensed light and condenses and emits the secondary condensed light; And A photovoltaic device comprising a solar cell that receives the second focused light and converts it into electrical energy. The method of claim 9, wherein the second light collecting member An incident surface that receives the first focused light; And And a light emitting surface that emits the second focused light and has an area smaller than that of the incident surface. The solar cell apparatus of claim 9, wherein the second light collecting member has a wedge shape. Incident surface; And An emission surface having an area smaller than the entrance surface, Condensing device for guiding the light incident through the incident surface by the total reflection, and emits through the exit surface. The condensing device according to claim 12, wherein the width becomes smaller as it moves away from the incident surface. 13. The light collecting device of claim 12, wherein the light collecting device has a light collecting magnification of about 30 to 1200 times. The method of claim 12, wherein the light collecting device A guide part including the incident surface; And Condensing device including a light emitting portion including the exit surface. The condenser of claim 15, wherein the light exit portion has a polygonal column shape or a circular column shape.

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