CN102062938A - Light converging device, design method thereof and light-converging photovoltaic power generation device - Google Patents
Light converging device, design method thereof and light-converging photovoltaic power generation device Download PDFInfo
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- CN102062938A CN102062938A CN2010105749297A CN201010574929A CN102062938A CN 102062938 A CN102062938 A CN 102062938A CN 2010105749297 A CN2010105749297 A CN 2010105749297A CN 201010574929 A CN201010574929 A CN 201010574929A CN 102062938 A CN102062938 A CN 102062938A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
Abstract
The invention relates to a light converging device, a design method thereof and a light-converging photovoltaic power generation device. The light-converging photovoltaic power generation device comprises a light converging device and a photovoltaic cell, wherein the light converging device comprises a focusing lens used for converging external light lays, and the photovoltaic cell is used for receiving the light rays and converting optical energy into electrical energy, the light converging device further comprises a secondary lens, and the focusing lens and the secondary lens are arranged in sequence from top to bottom. The secondary lens comprises a first optical surface located on the top of the secondary lens and a second optical surface located in the middle position of the bottom of the secondary lens, the first optical surface is arranged on the focal plane of the focusing lens and converges light rays emitted by the focusing lens to the second optical surface, and the light rays are transmitted to the photovoltaic cell through the second optical surface. By applying the invention, the energy loss of light rays reaching the surface of the photovoltaic cell is reduced, the illumination intensity of light rays irradiated on the surface of the photovoltaic cell is uniform, and the application range is wide.
Description
[technical field]
The present invention relates to a kind of beam condensing unit and method for designing thereof, and the concentrating photovoltaic power generation device that uses this beam condensing unit.
[background technology]
Luminous energy is subjected to the attention of each country in the world day by day as regenerative resource the abundantest on the earth.Yet up to the present, the luminous energy photovoltaic technology is not used as people's anticipation widely.Tracing it to its cause, mainly is because the photovoltaic system cost is too high.
Reducing one of effective way of photovoltaic system cost at present, is to increase the relatively low light collecting device of cost to form concentrating photovoltaic power generation device in photovoltaic power generation apparatus.The prior art concentrating photovoltaic power generation device comprises a collector lens, an even light prism and a photovoltaic cell, and this collector lens, this even light prism and this photovoltaic cell set gradually from top to bottom.This collector lens receives the outside sunray of injecting, and sunray converged in this even light prism, after should even light prism will entering its inner sunray and repeatedly reflecting, shine the surface of photovoltaic cell, this photovoltaic cell is an electric energy with transform light energy.
Yet, there are many defectives in the prior art concentrating photovoltaic power generation device, at first, because light just shines on the surface of photovoltaic cell after need repeatedly reflecting in even light prism, cause the optical energy loss that arrives photovoltaic cell bigger, and make that the light uneven illumination that shines the photovoltaic cell surface is even, thereby reduced the photoelectric transformation efficiency of photovoltaic cell; Secondly, be injected into the light generation total reflection of sparing in the light prism in order to make, the irradiating angle that then shines even light prism is limited to a small range, thereby causes its range of application comparatively limited.In addition, need be provided with even light prism the position and and the Fresnel condenser between angulation, make light be injected in the even light prism total reflection takes place, cause the assembly and adjustment of total system comparatively complicated thus, also increased the system mechanics instability simultaneously with specific angle.
[summary of the invention]
For the technical matters that photoelectric transformation efficiency is low and range of application is comparatively limited that solves the prior art concentrating photovoltaic power generation device, the invention provides a kind of photoelectric transformation efficiency height and range of application concentrating photovoltaic power generation device comparatively widely.
The invention provides a kind of beam condensing unit, it comprises that one is used for condenser lens that extraneous light is assembled, wherein, this beam condensing unit further comprises a secondary lens, this condenser lens and this secondary lens are provided with from top to bottom in regular turn, this secondary lens comprises that first optical surface and that is positioned at its top is positioned at second optical surface in its centre position, bottom, this first optical surface is arranged on the focal plane of this condenser lens, this first optical surface will be penetrated next convergence of rays to this second optical surface by condenser lens, and this second optical surface is transmitted to the outside with the light that receives.
Described secondary lens further comprises a bottom surface and a lateral surface, and this lateral surface and this first optical surface join, and this bottom surface and this lateral surface join, and this second optical surface is positioned at the centre position of this bottom surface.
Described secondary lens further comprises a bottom surface, a lateral surface, a fully reflecting surface and a medial surface, this lateral surface and this first optical surface join, this bottom surface and this lateral surface join, this bottom surface is the face that goes in ring, this medial surface all joins with this fully reflecting surface, this bottom surface, this second optical surface becomes the inverted cone structure with this fully reflecting surface, and this fully reflecting surface is the side of inverted cone.
Described secondary lens further comprises a lateral surface, one first ring surface, one second ring surface, a fully reflecting surface and a medial surface, this lateral surface and this first optical surface join, the bottom of this first ring surface and this lateral surface and the bottom of this medial surface all join, the top of this second ring surface and this medial surface and the top of this fully reflecting surface all join, this second optical surface becomes the inverted cone structure with this fully reflecting surface, and this fully reflecting surface is the side of inverted cone.
Described condenser lens is a Fresnel Lenses.
Along in the two-dimensional coordinate system of the longitudinal section direction of this Fresnel Lenses and this secondary lens, the lower surface of this Fresnel Lenses comprises a plurality of sawtooth and a plurality of end points, each sawtooth all is to be made of a vertical curve and a curve, each curve all is that the focus with this Fresnel Lenses is a focus, and crosses the hyperbolic curve of an end points.
Each sawtooth of described Fresnel Lenses is the identical tooth depth or the identical facewidth.
Along in the two-dimensional coordinate system of the longitudinal section direction of this Fresnel Lenses and this secondary lens, the face type curve of this first optical surface is that the right endpoint with the edge left end point of this Fresnel lens and this second optical surface is a focus, and crosses the cartesian ovals of the focus of this Fresnel Lenses.
The present invention also provides a kind of concentrating photovoltaic power generation device, it comprises a beam condensing unit and a photovoltaic cell, this beam condensing unit comprises that one is used for condenser lens that extraneous light is assembled, this photovoltaic cell is used for receiving light and is electric energy with transform light energy, wherein, this beam condensing unit comprises that further one is used for sparing the secondary lens of light, this condenser lens and this secondary lens are provided with from top to bottom in regular turn, this secondary lens comprises that first optical surface and that is positioned at its top is positioned at second optical surface in its centre position, bottom, this first optical surface is arranged on the focal plane of this condenser lens, this photovoltaic cell is arranged on the focal plane of this first optical surface, this first optical surface is penetrated condenser lens at the convergence of rays that comes and is arrived this second optical surface, and is transmitted on this photovoltaic cell by this second optical surface.
Described concentrating photovoltaic power generation device also comprises a packaging system and a tracking means, this packaging system is used for this beam condensing unit and this photovoltaic cell are packaged together, this packaging system is fixedly mounted on this tracking means, and this tracking means is adjusted the position and the angle of this packaging system according to the position of the difference moment sun.
The present invention also provides a kind of method for designing of beam condensing unit, comprises following design procedure:
Step I: first optical surface of determining secondary lens is along the face type curvilinear equation in the two-dimensional coordinate system of the longitudinal section direction of Fresnel lens and secondary lens;
Step I i: the face type curve of secondary lens is rotated around the longitudinal axis of this two-dimensional coordinate system, obtain the three-dimensional structure of secondary lens.
Described method for designing also comprised following design procedure before this step I:
Step I ii: determine incident angle, depth-width ratio, the bore of Fresnel lens, and the bore of second optical surface of secondary lens.
Described method for designing also comprises following design procedure after this step I:
Step I v:, determine the bore of first optical surface of secondary lens and the height of lateral surface according to the ray tracing principle.
Described method for designing also comprises a step v after this step I v, this step v is specially: according to the result of step I v, make the intersection point of first optical surface of light and secondary lens in the negative semiaxis interval of the transverse axis of this two-dimensional coordinate system,, then carry out step I i if satisfy this condition; If do not satisfy this condition, then change the depth-width ratio of Fresnel lens, and return step I ii, step I, step I v.
Described method for designing also comprises a step vi after this step I v or step v, step vi is: determine the bore of fully reflecting surface, first ring surface, second ring surface and the medial surface of secondary lens,
Described method for designing also comprises a step vii, and step vii is: each sawtooth of lower surface of determining Fresnel lens is along the face type curvilinear equation in the two-dimensional coordinate system of the longitudinal section direction of Fresnel lens and secondary lens;
Described method for designing also comprises a step viii after this step vii, step viii is: the length of determining the vertical curve of the thickness on top of Fresnel Lenses and each sawtooth, and, obtain the three-dimensional structure of Fresnel lens with the longitudinal axis rotation of the face type curve of Fresnel lens around this two-dimensional coordinate system.
Compared to prior art, the main beneficial effect of beam condensing unit of the present invention and method for designing thereof, concentrating photovoltaic power generation device is:
(1). the secondary lens of described beam condensing unit has first optical surface and second optical surface that is provided with in regular turn from top to bottom, after the light that described condenser lens is penetrated passes through first optical surface and the second optical surface transmission, promptly converge to each position on photovoltaic cell surface uniformly, it has reduced the optical energy loss that arrives the photovoltaic cell surface, and make that the light illumination that shines the photovoltaic cell surface is even, improved the photoelectric transformation efficiency of photovoltaic cell.
(2). first optical surface of the secondary lens of described beam condensing unit and second optical surface can be set at arbitrary dimension according to the needs that use, and institute can use a plurality of different field so that it has wide range of applications.
(3). first optical surface and second optical surface of realizing uniform condensing are the integrative-structure that is arranged on the secondary lens, and do not need to adjust the angular relationship of secondary lens and condenser lens, make that the assembling and the debugging of total system are all comparatively convenient, also improved the mechanical stability of system simultaneously.
[description of drawings]
Fig. 1 is the condenser lens of concentrating photovoltaic power generation device embodiment 1 of the present invention and the secondary lens diagrammatic cross-section along the longitudinal section direction.
Fig. 2 is the section enlarged diagram of the secondary lens of concentrating photovoltaic power generation device embodiment 1 of the present invention along the longitudinal section direction.
Fig. 3 is the step synoptic diagram of the beam condensing unit method for designing of concentrating photovoltaic power generation device embodiment 4 of the present invention.
Fig. 4 is the condenser lens of concentrating photovoltaic power generation device embodiment 4 of the present invention and the secondary lens diagrammatic cross-section along the longitudinal section direction.
[embodiment]
Embodiment 1
A kind of concentrating photovoltaic power generation device, it comprises a beam condensing unit, a photovoltaic cell, a heat abstractor, a packaging system and a tracking means.This beam condensing unit, this photovoltaic cell and this heat abstractor set gradually from top to bottom.This beam condensing unit is used for sunray is converged on this photovoltaic cell.This photovoltaic cell is used for receiving the light that beam condensing unit sends, and is electric energy with transform light energy.This packaging system is used for this beam condensing unit, this photovoltaic cell and this heat abstractor are packaged together.This packaging system is fixedly mounted on this tracking means, and this tracking means is adjusted the position and the angle of this packaging system according to the position of the difference moment sun.
As shown in Figure 1, this beam condensing unit comprises a condenser lens 10 and a secondary lens 20.This secondary lens 20 is arranged on the position of the focal plane of this condenser lens 10, and this photovoltaic cell contacts with the bottom of this secondary lens 20.This Fresnel lens 10 is used for extraneous light is converged on the secondary lens, and the light uniform convergence that this secondary lens is used for Fresnel lens is penetrated is to photovoltaic cell.The lower surface of this condenser lens comprises a plurality of annular concentric grooves.
In longitudinal section direction along this condenser lens 10 and this secondary lens 20, setting is coordinate transverse axis y with the plane of the bottom surface that is parallel to this secondary lens 20, with the center perpendicular to the bottom surface of this secondary lens 20 is that coordinate longitudinal axis z sets up two-dimensional coordinate system, and the lower surface of this condenser lens 10 comprises a plurality of sawtooth 12 and a plurality of end points 14.Each sawtooth 12 all is to be made of a vertical curve and a curve, and each curve all is that the focus with this Fresnel Lenses is a focus, and crosses the hyperbolic curve of an end points 14, crosses first terminal A as the curve of first sawtooth
1, the curve of second sawtooth is crossed second terminal A
2..., the curve of n sawtooth is crossed the n terminal A
n, wherein n is a natural number.According to the needs of practical operation, can design each sawtooth and have the identical tooth depth or the identical facewidth, and then can determine the terminal A of each sawtooth
n(A
Ny, A
Nz) two coordinate figures in one.Determine first terminal A
1Coordinate figure after, the face type curvilinear equation of each tooth has just been determined.
As shown in Figure 2, this secondary lens 20 comprises one first optical surface 21, one second optical surface 22, a fully reflecting surface 23, one first ring surface 24, one second ring surface 25, a lateral surface 26 and a medial surface 27.This first optical surface 21 is a curved surface, and it is positioned at the top of this secondary lens 20, and this second optical surface 22 and this first ring surface 24 all are positioned at the bottom of this secondary lens 20.The size of this second optical surface 22 and this photovoltaic cell measure-alike.This first ring surface 24 is positioned at the bottom of this secondary lens 20, and all joins with the bottom of this lateral surface 26 and the bottom of this medial surface 27.23 one-tenth inverted cone structures of this second optical surface 22 and this fully reflecting surface, wherein, this second optical surface 22 is the bottom surface of inverted cone, this fully reflecting surface 23 is the side of inverted cone.This second ring surface 25 the top of this medial surface 27 and this fully reflecting surface 23 between the top, and join with the top of this medial surface 27.
Along in the two-dimensional coordinate system of the longitudinal section direction of this condenser lens 10 and this secondary lens 20, the face type curve of this first optical surface 21 is that edge left end point (not indicating) and this photovoltaic cell right endpoint (not indicating) with this Fresnel lens 10 is focus, and crosses the cartesian ovals of the focus (not indicating) of this condenser lens 10.
This first ring surface 24, this second ring surface 25, this lateral surface 26 and this medial surface 27 are non-optical.Wherein, set this second optical surface 22 and this fully reflecting surface 23 between angle be α, the bore of second optical surface 21 is d, the height of this fully reflecting surface 23 is f, the outer bore of this second ring surface 25, interior bore and width are respectively c, g and e, and then the interior bore of this second ring surface 25 satisfies relational expression:
The width of this second ring surface 25 is e=c-g.This first ring surface 24, this second ring surface 25, this lateral surface 26 and this medial surface 27 all are non-optical.This angle α span is decided because of specific design, and in order to make the light that can not arrive photovoltaic cell on this fully reflecting surface 23 total reflection take place as far as possible, this angle α is set at 40 degree to 70 degree.
This photovoltaic cell comprises photovoltaic battery panel (figure does not show) and external circuits (figure does not show).This photovoltaic battery panel is arranged on the focal plane of first optical surface 21 of this secondary lens 20 and with its second optical surface 22 and contacts, and is used for receiving the light that second optical surface 21 of this secondary lens 20 penetrates, and is electric energy with transform light energy.This external circuits is used for electric energy is outputed to outside electric energy storage device.This heat abstractor is arranged on the lower surface of this photovoltaic battery panel, causes photoelectric efficient of system to reduce to avoid photovoltaic cell because of long-time irradiation produces too much heat.
Embodiment 2
The concentrating photovoltaic power generation device of concentrating photovoltaic power generation device of the present invention and embodiment 1 is roughly the same, its key distinction is: this secondary lens comprises one first optical surface, one second optical surface, a bottom surface and a lateral surface, this first optical surface is positioned at the top of this secondary lens, this lateral surface and this first optical surface join, this bottom surface and this lateral surface join, and this second optical surface is positioned at the centre position of this bottom surface.
Embodiment 3
The concentrating photovoltaic power generation device of concentrating photovoltaic power generation device of the present invention and embodiment 1 is roughly the same, its key distinction is: this secondary lens further comprises one first optical surface, one second optical surface, one bottom surface, one lateral surface, one fully reflecting surface and a medial surface, this first optical surface is positioned at the top of this secondary lens, this second optical surface is positioned at the centre position, bottom of this secondary lens, this lateral surface and this first optical surface join, this bottom surface and this lateral surface join, this bottom surface is the face that goes in ring, this medial surface and this fully reflecting surface and this bottom surface all join, this second optical surface becomes the inverted cone structure with this fully reflecting surface, and this fully reflecting surface is the side of inverted cone.
Embodiment 4
As shown in Figure 3 and Figure 4, the present invention also provides a kind of method for designing to above-mentioned beam condensing unit, promptly to the method for designing of Fresnel lens 50 and secondary lens 60.This method for designing is according to the Kohler illumination principle.This method for designing mainly is based on the two-dimensional design of the longitudinal section of Fresnel lens 50 and secondary lens 60, obtains three-dimensional structure by two-dimensional curve central shaft rotation longitudinally again.Its specific design step is as follows:
Step I: the concrete numerical value of at first determining a plurality of parameters of Fresnel lens 50 and secondary lens 60, determine that geometric concentrating ratio is C, the bore of second optical surface 62 of secondary lens 60 is d, the depth-width ratio of Fresnel lens 50 is a, set the bore of Fresnel lens 50 and represent that with D the light entrance half-angle is θ
t, it receives half-angle is θ '
t, according to the geometric concentrating ratio formula
Try to achieve the bore of Fresnel lens 50
By above-mentioned geometric concentrating ratio formula as can be known, receive half-angle θ '
tGet 90 when spending, the maximal value of geometric concentrating ratio C, but generally can't reach, generally get acceptance one-half angle θ ' during design
tBe about 70 degree, therefore, entrance half-angle
In the present invention, get geometric concentrating ratio C=1000, then entrance half-angle θ
t=1 degree;
Step I i: first optical surface 61 of determining secondary lens 60 is along the face type curvilinear equation in the two-dimensional coordinate system of the longitudinal section direction of this Fresnel lens 50 and this secondary lens 60, setting this two-dimensional coordinate system is coordinate transverse axis y with the plane that is parallel to second optical surface, 62 places, with the center perpendicular to the plane, place of second optical surface 62 is coordinate longitudinal axis z, determine the coordinate of the edge right endpoint (indicating) of second optical surface 62 of the focus of this Fresnel lens 50 and edge left end point 54 and this secondary lens, the horizontal ordinate of the edge left end point 54 of this Fresnel lens 50 is half a bore value of Fresnel lens 50, promptly-D/2, ordinate is D*a, the horizontal ordinate of the edge right endpoint of this second optical surface 62 is half bore of second optical surface, i.e. d/2; The face type curve of setting this first optical surface 61 is that the edge right endpoint with the edge left end point 54 of this Fresnel lens 50 and this second optical surface 62 is a focus, and crosses the cartesian ovals of the focus of this Fresnel Lenses 50;
Step I ii: determine the sawtooth curve equation of Fresnel lens 50 lower surfaces in this two-dimensional coordinate system, each sawtooth 52 all is to be made of a vertical curve and a curve, each curve all is that the focus with this Fresnel Lenses 50 is a focus, and crosses the hyperbolic curve of an end points;
Step I v: according to the ray tracing principle, determine the bore of first optical surface 61 of secondary lens 60 and the height of this lateral surface 66, the bore of setting this first optical surface 61 is with D
sExpression is with negative entrance half-angle-θ
tThe light of incident is the first light r1, with normal incidence half-angle θ
tThe light of incident is that (regulation then is the normal incidence angle when the included angle cosine value of incident ray and two-dimensional coordinate transverse axis y axle is timing to the second light r2; Otherwise, then be negative incidence), according to the ray tracing principle, the trace first light r1 and the second light r2, obtain this first light through the edge end points that first optical surfaces 61 of Fresnel lens 50 backs and secondary lens 60 intersect, the coordinate of setting the edge end points on first optical surface 61 of this secondary lens 60 is B (B
y, B
z), then the bore of first optical surface 61 of secondary lens 60 is D
s=2*|B
y|, the height of this lateral surface 66 is the ordinate of edge terminal B, is | B
z|;
Step v: according to the result of step I v, the intersection point of first optical surface 61 that makes the light of winning, second light and secondary lens 60 is all in the negative semiaxis interval of the transverse axis of this two-dimensional coordinate system, if do not satisfy this condition, then change the depth-width ratio a of Fresnel lens, promptly change the ordinate value of its edge left end point, and return step I to step I v; If satisfy this condition, then carry out step vi to step vii;
Step vi: the bore of determining fully reflecting surface 63, first ring surface 64, second ring surface 65 and the medial surface 67 of secondary lens 60, wherein, set this second optical surface 62 and this fully reflecting surface 63 between angle be α, the bore of second optical surface 62 is d, the height of fully reflecting surface 63 is f, the outer bore of second ring surface 65, interior bore and width are respectively c, g and e, and then the interior bore of second ring surface 65 satisfies relational expression:
The width of second ring surface 65 is e=c-g.This first ring surface 64, second ring surface 65, lateral surface 66 and this medial surface 67 all are non-optical.This angle α span is decided because of specific design, and in order to make the light that can not arrive this second optical surface 62 on this fully reflecting surface 63 total reflection take place as far as possible, this angle α is set at 40 degree to 70 degree;
Step vii: the length of determining the vertical curve of the thickness on top of Fresnel Lenses 50 and each sawtooth 52, and, obtain the three-dimensional structure of this Fresnel lens 50 and this secondary lens 60 with the longitudinal axis rotation of the face type curve of this Fresnel lens 50 and this secondary lens 60 around this two-dimensional coordinate system.
The method for designing of this beam condensing unit might not be carried out to the order of step vii in strict accordance with above-mentioned steps i, also can change the wherein order of part steps, as changing the sequencing of step I ii and step I v, step I v and step v.In addition, the method for designing of this beam condensing unit might not comprise above-mentioned steps i whole to step vii, also can only comprise the part steps of step I to the step vii.In addition, in step I, the face type curve of this first optical surface 61 can be a focus with the edge right endpoint of this Fresnel lens 50 and the left end point of this second optical surface 62 also.
It is described that concentrating photovoltaic power generation device of the present invention is not limited to the foregoing description, and it also can comprise other change designs, as: can design other shape spatial structures according to the needs of use between first optical surface of this secondary lens and second optical surface; This secondary lens also can be provided with a plurality of fully reflecting surfaces in a plurality of positions between first optical surface and second optical surface; This secondary lens only comprises one first optical surface, one second optical surface and one and the side that all joins of this first optical surface, second optical surface.
The invention provides a kind of optically focused device and method for designing thereof, concentrating photovoltaic power generation device, compared to prior art, the beneficial effect that mainly contains of the present invention really is:
(1). the secondary lens of described optically focused device has first optical surface and second optical surface that arranges in regular turn from top to bottom, after the light that described focusing lens are penetrated passes through first optical surface and the second optical surface transmission, namely converge to uniformly each position on photovoltaic cell surface, it has reduced the optical energy loss that arrives the photovoltaic cell surface, and so that it is even to shine the light illumination on photovoltaic cell surface, improved the photoelectric transformation efficiency of photovoltaic cell.
(2). first optical surface of the secondary lens of described optically focused device and second optical surface can be set at any size according to the needs that use, and institute can use a plurality of different field so that it has wide range of applications.
(3). first optical surface and second optical surface of realizing uniform condensing are the integrative-structure that is arranged on the secondary lens, and do not need to adjust secondary lens and the angular relationship that focuses on lens, so that the assembling of whole system and debugging are all comparatively convenient, also improved the mechanical stability of system simultaneously.
Claims (17)
1. beam condensing unit, it comprises that one is used for condenser lens that extraneous light is assembled, it is characterized in that, this beam condensing unit further comprises a secondary lens, this condenser lens and this secondary lens are provided with from top to bottom in regular turn, this secondary lens comprises that first optical surface and that is positioned at its top is positioned at second optical surface in its centre position, bottom, this first optical surface is arranged on the focal plane of this condenser lens, this first optical surface will be penetrated next convergence of rays to this second optical surface by condenser lens, and this second optical surface is transmitted to the outside with the light that receives.
2. beam condensing unit according to claim 1, it is characterized in that this secondary lens further comprises a bottom surface and a lateral surface, this lateral surface and this first optical surface join, this bottom surface and this lateral surface join, and this second optical surface is positioned at the centre position of this bottom surface.
3. beam condensing unit according to claim 1, it is characterized in that, this secondary lens further comprises a bottom surface, a lateral surface, a fully reflecting surface and a medial surface, this lateral surface and this first optical surface join, this bottom surface and this lateral surface join, and this bottom surface is the face that goes in ring, and this medial surface and this fully reflecting surface, this bottom surface all join, this second optical surface becomes the inverted cone structure with this fully reflecting surface, and this fully reflecting surface is the side of inverted cone.
4. beam condensing unit according to claim 1, it is characterized in that, this secondary lens further comprises a lateral surface, one first ring surface, one second ring surface, a fully reflecting surface and a medial surface, this lateral surface and this first optical surface join, the bottom of this first ring surface and this lateral surface and the bottom of this medial surface all join, the top of this second ring surface and this medial surface and the top of this fully reflecting surface all join, this second optical surface becomes the inverted cone structure with this fully reflecting surface, and this fully reflecting surface is the side of inverted cone.
5. according to claim 1,2,3 or 4 described beam condensing units, it is characterized in that this condenser lens is a Fresnel Lenses.
6. beam condensing unit according to claim 5, it is characterized in that, along in the two-dimensional coordinate system of the longitudinal section direction of this Fresnel Lenses and this secondary lens, the lower surface of this Fresnel Lenses comprises a plurality of sawtooth and a plurality of end points, each sawtooth all is to be made of a vertical curve and a curve, each curve all is that the focus with this Fresnel Lenses is a focus, and crosses the hyperbolic curve of an end points.
7. beam condensing unit according to claim 6 is characterized in that, each sawtooth of this Fresnel Lenses is the identical tooth depth or the identical facewidth.
8. according to claim 6 or 7 described beam condensing units, it is characterized in that, along in the two-dimensional coordinate system of the longitudinal section direction of this Fresnel Lenses and this secondary lens, the face type curve of this first optical surface is that the right endpoint with the edge left end point of this Fresnel lens and this second optical surface is a focus, and crosses the cartesian ovals of the focus of this Fresnel Lenses.
9. concentrating photovoltaic power generation device, it comprises a beam condensing unit and a photovoltaic cell, this beam condensing unit comprises that one is used for condenser lens that extraneous light is assembled, this photovoltaic cell is used for receiving light and is electric energy with transform light energy, it is characterized in that, this beam condensing unit comprises that further one is used for sparing the secondary lens of light, this condenser lens and this secondary lens are provided with from top to bottom in regular turn, this secondary lens comprises that first optical surface and that is positioned at its top is positioned at second optical surface in its centre position, bottom, this first optical surface is arranged on the focal plane of this condenser lens, this photovoltaic cell is arranged on the focal plane of this first optical surface, this first optical surface is penetrated condenser lens at the convergence of rays that comes and is arrived this second optical surface, and is transmitted on this photovoltaic cell by this second optical surface.
10. concentrating photovoltaic power generation device according to claim 9, it is characterized in that, this concentrating photovoltaic power generation device also comprises a packaging system and a tracking means, this packaging system is used for this beam condensing unit and this photovoltaic cell are packaged together, this packaging system is fixedly mounted on this tracking means, and this tracking means is adjusted the position and the angle of this packaging system according to the position of the difference moment sun.
11. the method for designing of a beam condensing unit is characterized in that, comprises following design procedure:
Step I: first optical surface of determining secondary lens is along the face type curvilinear equation in the two-dimensional coordinate system of the longitudinal section direction of Fresnel lens and secondary lens;
Step I i: the face type curve of secondary lens is rotated around the longitudinal axis of this two-dimensional coordinate system, obtain the three-dimensional structure of secondary lens.
12. the method for designing of beam condensing unit according to claim 11 is characterized in that, this method for designing also comprised following design procedure before this step I:
Step I ii: determine incident angle, depth-width ratio, the bore of Fresnel lens, and the bore of second optical surface of secondary lens.
13. the method for designing of beam condensing unit according to claim 12 is characterized in that, this method for designing also comprises following design procedure after this step I:
Step I v:, determine the bore of first optical surface of secondary lens and the height of lateral surface according to the ray tracing principle.
14. the method for designing of beam condensing unit according to claim 13, it is characterized in that, this method for designing also comprises a step v after this step I v, this step v is specially: according to the result of step I v, make the intersection point of first optical surface of light and secondary lens in the negative semiaxis interval of the transverse axis of this two-dimensional coordinate system, if satisfy this condition, then carry out step I i; If do not satisfy this condition, then change the depth-width ratio of Fresnel lens, and return step I ii, step I, step I v.
15. method for designing according to claim 13 or 14 described beam condensing units, it is characterized in that, this method for designing also comprises a step vi after this step I v or step v, step vi is: the bore of determining fully reflecting surface, first ring surface, second ring surface and the medial surface of secondary lens.
16. method for designing according to claim 11,12,13 or 14 described beam condensing units, it is characterized in that, this method for designing also comprises a step vii, and step vii is: each sawtooth of lower surface of determining Fresnel lens is along the face type curvilinear equation in the two-dimensional coordinate system of the longitudinal section direction of Fresnel lens and secondary lens.
17. the method for designing of beam condensing unit according to claim 16, it is characterized in that, this method for designing also comprises a step viii after this step vii, step viii is: the length of determining the vertical curve of the thickness on top of Fresnel Lenses and each sawtooth, and, obtain the three-dimensional structure of Fresnel lens with the longitudinal axis rotation of the face type curve of Fresnel lens around this two-dimensional coordinate system.
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