CN201504194U - Solar generating set using double bounce technique to realize multiple condensation - Google Patents

Abstract

The utility model discloses a solar generating set using a double bounce technique to realize multiple condensation. The periphery wall of a secondary reflective body positioned in a primary reflective bowl-shaped shell is provided with a secondary reflector curved surface matched with a primary reflector curved surface. Positions among the primary reflector curved surface, the secondary reflector curved surface and a photovoltaic cell illuminated face are matched with each other and form a corresponding bowl-shaped cavity. A curvilinear function of a section of the secondary reflector curved surface is a curve that corresponding coordinate values of the section are in one-one correspondence to coordinate values of a curvilinear path of a function of a section of the paraboloid of revolution. The utility model has relatively uniform radiation intensity on each point on the surface of the photovoltaic cell so as to improve the photoelectric conversion efficiency per unit area of the common photovoltaic cell, even realize the concentrating ratio with higher multiple and achieve the aim of using less photovoltaic cells under the condition that the power is set. Therefore, the utility model can reduce the total cost of the photovoltaic system.

Description

A kind of device of solar generating that uses double bounce technique to realize several times optically focused

Technical field

The utility model relates to a kind of structure of concentration photovoltaic system photoelectric conversion module, belongs to technical field of solar utilization technique, particularly a kind of device of solar generating that uses double bounce technique to realize several times optically focused.

Background technology

Tap a new source of energy and renewable and clean energy resource be the common issue that the whole world faces, new energy development with utilize in the mode, photovoltaic generation attracts tremendous attention.At present, photovoltaic generation mainly adopts the ordinary flat photovoltaic generating system.The ordinary flat photovoltaic generating system is directly placed (angled with ground) with dull and stereotyped solar module towards low latitudes, reaches the purpose of using solar power generation thereby form the solar energy photovoltaic array in series-parallel mode.In the ordinary flat photovoltaic generating system, the cost of solar cell accounts for significant proportion in the system synthesis basis, because the price comparison of solar cell is high, thereby has directly caused the cost of system too high.At present, the conversion efficiency of the photovoltaic cell of use is low, cost is high, is the not one of the main reasons of wide popularization and application on market of photovoltaic generation.

Photovoltaic cell can be worked under quite high light intensity condition, uses photovoltaic cell to carry out opto-electronic conversion under the optically focused condition, is one of effective way that reduces cost for solar power generation.Adopt concentration photovoltaic system, can reduce the required cell area of given power, partly replace expensive solar cell with comparatively cheap concentrator.In this system, the total cost of solar cell can significantly reduce, and the total cost of electricity generation system also descends thereupon.

If concentrator cell is worked under the sun light intensity condition of 300 times or higher multiple, and can reach quite high photoelectric conversion efficiency (25%-36%).But, the photovoltaic cell of this high power concentrator needs expensive semi-conducting material (indium gallium or purification high purity silicon etc.), and processing technology is also very complicated, when using under the optically focused condition, it is very high that the temperature of photovoltaic cell can become, and needs cooling technology harsher and that efficient is very high.Especially under the silicon materials photovoltaic cell, constant situation that photovoltaic battery temperature raises in, can cause open circuit voltage to reduce at intensity of sunshine, reduced rate is-0.4%/K～-0.5%/K, thus the power output of silicon materials photovoltaic cell is also reduced.Cooling device can increase the cost of photovoltaic generating system, is not suitable for general occasion and promotes the use of.

If concentrator cell is worked under with interior sun light intensity condition at 3～10 times, can save 66～90% solar cell.In the temperature that solar cell produces, can carry out efficiently radiates heat by the mode of using conventional fin.Therefore, this concentrator cell has certain advantage aspect the reduction cost of electricity-generating.

Be called in the patent document of " making the solar-energy photovoltaic cell generating device of realizing several times optically focused with light funnel bounce technique on earth " in disclosed patent No. ZL200510200596.0, name, this device can be realized 3～7 times optically focused ratio in theory, yet under reality, consider factors such as size and reflection loss, can only reach 3.5～4.3 times optically focused ratio.If reach described 7 times of optically focused ratios, the size of its reflecting surface needs endless just can accomplish, this obviously is impracticable in production application.That is to say that this structure can not doubly even between the higher multiple realize size change at 3-10, to adapt to different temperature environments.On the other hand, what this device adopted is plastic casing, making under the various factors actings in conjunction such as processing and temperature, make with plastics is that the plane reflection face that substrate forms very easily deforms, reflecting surface after the distortion is very inhomogeneous at the optically focused light that its solar battery surface distributes, and makes the opto-electronic conversion ability drop of solar cell.

Transmission optically focused also is an approach that realizes higher multiple, and it also is very noticeable reducing the cost that gets off owing to a large amount of productions of Fresnel Lenses.Yet from the angle of technology, the uniformity of the optically focused light intensity of Fresnel Lenses on certain surface is less better relatively.From industrialized viewpoint of measures, than bounce technique, the cost of special lens still is higher than the cost with high reflectivity mirror face.

The utility model content

The purpose of this utility model is to provide a kind of device of solar generating that uses double bounce technique to realize several times optically focused, and each point has more uniform radiation intensity on the photovoltaic cell surface, helps improving the whole photoelectric conversion efficiency of photovoltaic cell.

The purpose of this utility model is achieved in that a kind of device of solar generating that uses double bounce technique to realize several times optically focused, glued membrane will be sealed in the photovoltaic cell that conductive plate is connected on the circuit board, the electric current follower that conductive plate and photovoltaic cell constituted together is equipped with in the base at mirror surface body bottom opening place, annular waterproof sealing trim ring fitted seal mirror surface body lower ending opening, the setting that matches with photovoltaic cell sensitive surface up of mirror surface body, radiator base plate cooperate and are packed on the base that is positioned at mirror surface body bottom;

The mirror surface body is matched by secondary reflecting body and once reflective bowl-shaped shell and constitutes, and the primary event mirror curved surface of once reflective its internal perisporium setting of bowl-shaped shell is the paraboloid of revolution; Be positioned at once the secondary reflecting body of reflective bowl-shaped shell, the secondary reflection mirror curved surface that matches with primary event mirror curved surface is being set on its periphery wall, the central axial line of the central axial line of this secondary reflection mirror curved surface and primary event mirror curved surface coincides; Once reflective bowl-shaped shell upper end great circle opening is installed sealing by the corresponding transparent protective cover plate that is the disk shape of shape; Corresponding upper end of secondary reflecting body and transparent protective cover plate inner surface Joint, the upper end of secondary reflection mirror curved surface is concordant with the upper end of primary event mirror curved surface, secondary reflection mirror curved surface and the corresponding cooperation of primary event mirror curved surface, primary event mirror curved surface, the mutual corresponding matching in position between secondary reflection mirror curved surface and the photovoltaic cell sensitive surface also forms corresponding bowl-shape cavity, corresponding incident ray forms the primary event light of reflection first through primary event mirror camber reflection to secondary reflection mirror curved surface, form again the secondary reflection light of secondary reflection through secondary reflection mirror curved surface to photovoltaic cell sensitive surface, all intersect at the optical focus of primary event mirror curved surface top along the line stretcher of primary event light ray propagation direction, the central axial line of primary event mirror curved surface and secondary reflection mirror curved surface coincides in the Y-axis line, and the joining that any incident ray and the primary event light that is reflected form on primary event mirror curved surface to the vertical range of Y-axis line is x ₂, be positioned at primary event light and secondary reflection light and on secondary reflection mirror curved surface, form the secondary joining, being positioned at the corresponding vertical range that is subjected to luminous point and Y-axis line that forms on the photovoltaic cell sensitive surface of secondary reflection light is x ₁, wherein, photovoltaic cell sensitive surface and X-axis line coincide, and its center of circle overlaps with the origin of coordinates, and disk shape photovoltaic cell sensitive surface is corresponding vertical with the Y-axis line;

Its cross section curve function of the paraboloid of revolution of described primary event mirror curved surface is: $y=x_2^2/2R,$ Wherein, x ₂For be positioned at a joining that incident ray and primary event light forms known vertical range, 0＜x on primary event mirror curved surface to the Y-axis line ₂≤ R, R are internal perisporium primary event mirror curved surface upper end radius;

The functional relation that satisfies between primary event mirror curved surface upper end radius R and the secondary reflection mirror curved surface tip radius r is:

$R=r\sqrt{(n+1)},$ Wherein, n is the optically focused radiation intensity that received of the photovoltaic cell sensitive surface of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell;

The known x of primary event mirror curved surface paraboloid of revolution cross section function curve then ₂Value and each are subjected to the luminous point position to locate corresponding known x ₁The functional relation that satisfies between the value is:

$n\&CenterDot;x_1^2=x_2^2-{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^2,$ Wherein, n is the optically focused radiation intensity that received of the photovoltaic cell sensitive surface of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell, according to each known x ₂The value correspondence can be learnt respective x ₁Value;

On secondary reflection mirror curved surface, follow the known coordinate value of function curve line segment on it in the law of light reflection and secondary reflection mirror curved surface cross section according to incident ray and second incident light line,

The curvilinear function in its cross section of secondary reflection mirror curved surface is the corresponding one by one curve of coordinate figure of its respective coordinate value and paraboloid of revolution cross section function curve track.

The utility model is by protective glass 1, once reflective bowl-shaped shell 3, secondary reflecting body 2, annular waterproof sealing trim ring 4, glued membrane 5, photovoltaic cell 6, conducting strip 7, radiator, set bolt 9 etc. are formed, there is the axial symmetry paraboloid of revolution once reflective bowl-shaped shell 3 inside, secondary reflection mirror curved surface 10 is arranged on secondary reflecting body 2 periphery walls, by the primary event mirror curved surface 11 of the axial symmetry rotation of reflective bowl-shaped shell 3 inside once, the sunray that will be parallel to rotating shaft converges to focus.Secondary reflection mirror curved surface 10 also is axisymmetric surface of revolution, be positioned at once the focus place of the primary event mirror curved surface 11 that is provided with on reflective bowl-shaped shell 3 periphery walls, the light of no show focus is still reflexed to once the bottom of reflective bowl-shaped shell 3 once more, photovoltaic cell 6 is installed in the bottom.

Key point of the present utility model is that the secondary reflection mirror curved surface 10 that is had on secondary reflecting body 2 periphery walls is to be made through calculating the back precision, make when converging in the photovoltaic cell surface through the light behind these secondary reflection mirror curved surface 10 secondary reflections, every bit on photovoltaic cell 6 surfaces, all have identical, be several times as much as the radiation intensity of incident sunlight, thereby improved the photoelectric conversion efficiency of the common photovoltaic cell of unit are, can be than being easier to realize 3～10 times, even the optically focused of higher multiple ratio, reach under given power condition, use the purpose of less photovoltaic cell, thereby can reduce the total cost of photovoltaic generating system.

Description of drawings

Fig. 1 is the structural representation that the utility model assembly decomposes;

Fig. 2 is the function curve geometrical relationship schematic diagram that once reflective bowl-shaped shell of the utility model and secondary reflecting body are positioned at conplane reflecting curved surface cross section;

Fig. 3 is the light path principle schematic diagram of the light reflecting curved surface that matches with the secondary reflecting body of the once reflective bowl-shaped shell of the utility model;

Fig. 4 is cross-sectional view figure of the present utility model;

Fig. 5 is the plan structure schematic diagram of the utility model side top;

Fig. 6 is the plan structure schematic diagram of the utility model side-lower.

Number in the figure is described as follows:

The transparent protective cover plate of 1-; 2-secondary reflecting body; The once reflective bowl-shaped shell of 3-;

4-annular waterproof sealing trim ring; The 5-glued membrane; The 6-photovoltaic cell;

The 7-conducting strip; The 8-fin; The 9-set bolt;

10-secondary reflection mirror curved surface; 11-primary event mirror curved surface; The 12-base;

The 13-radiator base plate.

Embodiment

A kind of device of solar generating that uses double bounce technique to realize several times optically focused, extremely shown in Figure 6 as Fig. 1, glued membrane 5 will be sealed on the circuit board with the photovoltaic cell 6 that conductive plate 7 is connected, the electric current follower that conductive plate 7 and photovoltaic cell 6 are constituted together is equipped with in the base 12 at mirror surface body bottom opening place, annular waterproof sealing trim ring 4 fitted seal mirror surface body lower ending openings, the setting that matches with photovoltaic cell 6 sensitive surface up of mirror surface body, radiator base plate 13 cooperate and are packed on the base 12 that is positioned at mirror surface body bottom;

The mirror surface body is matched by secondary reflecting body 2 and once reflective bowl-shaped shell 3 and constitutes, and the primary event mirror curved surface 11 that once reflective bowl-shaped shell 3 its periphery walls are provided with is the paraboloid of revolution; Be positioned at once the secondary reflecting body 2 of reflective bowl-shaped shell 3, the secondary reflection mirror curved surface 10 that matches with primary event mirror curved surface 11 is being set on its periphery wall, and the central axial line of the central axial line of this secondary reflection mirror curved surface 10 and primary event mirror curved surface 11 coincides; Once reflective bowl-shaped shell 3 upper end great circle openings are installed sealing by the corresponding transparent protective cover plate 1 that is the disk shape of shape; Secondary reflecting body 2 corresponding upper ends and transparent protective cover plate 1 inner surface Joint, the upper end of secondary reflection mirror curved surface 10 is concordant with the upper end of primary event mirror curved surface 11, secondary reflection mirror curved surface 10 and the 11 corresponding cooperations of primary event mirror curved surface, primary event mirror curved surface 11, the mutual corresponding matching in position between secondary reflection mirror curved surface 10 and the photovoltaic cell sensitive surface also forms corresponding bowl-shape cavity, corresponding incident ray reflexes to secondary reflection mirror curved surface 10 through primary event mirror curved surface 11 and forms the primary event light of reflection first, form again the secondary reflection light of secondary reflection to photovoltaic cell 6 sensitive surfaces through secondary reflection mirror curved surface 10, all intersect at the optical focus of primary event mirror curved surface 11 tops along the line stretcher of primary event light ray propagation direction, primary event mirror curved surface 11 coincides in the Y-axis line with the central axial line of secondary reflection mirror curved surface 10, and the joining that any incident ray and the primary event light that is reflected form on primary event mirror curved surface 11 to the vertical range of Y-axis line is x ₂, be positioned at primary event light and secondary reflection light and on secondary reflection mirror curved surface 10, form the secondary joining, being positioned at the corresponding vertical range that is subjected to luminous point and Y-axis line that forms on photovoltaic cell 6 sensitive surfaces of secondary reflection light is x ₁, wherein, photovoltaic cell 6 sensitive surfaces and X-axis line coincide, and its center of circle overlaps with the origin of coordinates, and disk shape photovoltaic cell 6 sensitive surfaces are corresponding vertical with the Y-axis line;

Its cross section curve function of the paraboloid of revolution of described primary event mirror curved surface 11 is: $y=x_2^2/2R,$ Wherein, x ₂For be positioned at a joining that incident ray and primary event light forms known vertical range, 0＜x on primary event mirror curved surface 11 to the Y-axis line ₂≤ R, R are internal perisporium primary event mirror curved surface 11 upper end radiuses;

The functional relation that satisfies between primary event mirror curved surface 11 upper end radius Rs and the secondary reflection mirror curved surface 10 tip radius r is:

$R=r\sqrt{(n+1)},$ Wherein, n is the optically focused radiation intensity that received of photovoltaic cell 6 sensitive surfaces of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell 6;

The known x of primary event mirror curved surface 11 paraboloid of revolution cross section function curves then ₂Value and each are subjected to the luminous point position to locate corresponding known x ₁The functional relation that satisfies between the value is:

$n\&CenterDot;x_1^2=x_2^2-{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^2,$ Wherein, n is the optically focused radiation intensity that received of photovoltaic cell 6 sensitive surfaces of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell 6, according to each known x ₂The value correspondence can be learnt respective x ₁Value;

On secondary reflection mirror curved surface 10, follow the known coordinate value of function curve line segment on it in the law of light reflection and secondary reflection mirror curved surface 10 cross sections according to incident ray and second incident light line,

The curvilinear function in secondary reflection mirror curved surface 10 its cross sections is the corresponding one by one curve of coordinate figure of its respective coordinate value and paraboloid of revolution cross section function curve track.

As shown in Figure 2, according to the primary event light line segment BF and the secondary reflection light line segment FO that set ₁Constitute the trigonometric function relation and the optical reflection law of angle and angle bisector thereof; learn or the optimal design algorithm by the calculus principle in the higher mathematics, discrete mathematics and computer engineering algorithm, also just can determine secondary reflection mirror curved surface 10 its cross section function curve track or its equations of determining.When its upper end of the function curve line segment in secondary reflection mirror curved surface 10 cross sections really the position fixing value be (r, R/2), r≤x ₂During≤R, be the technical application scheme of the best.

6 of photovoltaic cells are made of common dull and stereotyped silicon photocell.Transparent protective cover plate 1 is made of optical plastic or optical glass.

Radiator is the fin 8 perpendicular to base 12 base plate faces of uniform setting on radiator base plate 13 lower faces.

Above-mentioned embodiment technical scheme of the present invention below is the concrete implementation process of the present invention and the explaination of design principle:

As Fig. 1, shown in Figure 4, the present invention is by transparent protective cover plate 1, secondary reflecting body 2, once reflective bowl-shaped shell 3, annular waterproof sealing trim ring 4, compositions such as glued membrane 5, photovoltaic cell 6, conducting strip 7, radiator 8, set bolt 9, wherein be processed with secondary reflection mirror curved surface 10 on the secondary reflecting body 2, as a convex mirror, be processed with primary event mirror curved surface 11 on the once reflective bowl-shaped shell 3, be equivalent to a concave mirror, successively glued membrane 5, photovoltaic cell 6, conducting strip 7, radiator 8 encapsulation be fixed together with laminating machine.By the thermolysis of radiator 8, the temperature on photovoltaic cell 6 and the conducting strip 7 is reduced, make the photoelectric conversion efficiency of photovoltaic cell 6 obvious reduction can not take place.Conducting strip 7 allows the big electric current by producing behind the optically focused.When radiator 8 being fixed on once the bottom of reflective bowl-shaped shell 3 by set bolt 9, can stop steam, the dust etc. of annular waterproof sealing trim ring 4 are gone into by transparent protective cover plate 1, the bowl-shape cavity that forms of reflective bowl-shaped shell 3, photovoltaic cell 6 once, can prevent the reflectivity decline of secondary reflection mirror curved surface 10 and primary event mirror curved surface 11.

As shown in Figure 2, the secondary reflection mirror curved surface 10 of processing on the secondary reflecting body 2, once have specific geometry and position relation between the sensitive surface of the primary event mirror curved surface 11 of processing and photovoltaic cell 6 on the reflective bowl-shaped shell 3.Y-axis is parallel with sunray, and sunray is along the parallel incident of NC direction, and Y-axis is passed from the center of circle of circular photovoltaic cell 6, and perpendicular to the sensitive surface of photovoltaic cell 6.The surface of line segment OG and photovoltaic cell 6 is positioned at same plane, and the radius r of expression photovoltaic cell 6.

Line segment AL represents the radius R of primary event mirror curved surface 11 cross section curve outers, the B point be in the primary event mirror curved surface 11 along last a bit.Curve B CA is that function curve is $[y=(x_2^2/2R)]$ Parabola in one section, be central shaft with the Y-axis, curve B CA forms primary event mirror curved surface 11 around rotation Y-axis after one week.The L point is the optical focus of each speculum curved surface 11.

Secondary reflecting body 2 is a rotating shaft with the Y-axis, wherein the M point be on secondary reflecting body 2 outers a bit, the X-axis coordinate that M, B, G are 3 is identical, is the radius r of photovoltaic cell 6.Curve M DF is that rotating shaft rotates a circle and forms secondary reflection mirror curved surface 10 with the Y-axis.

The outer of primary event mirror curved surface 11 and the outer of reflective mirror curved surface 10 are in same plane, line segment AML is positioned on the focal plane of primary event mirror curved surface 11, so, shine the light of ordering in A after reflection, press the aspect of AM and propagate, after the M point reflects once more, pressing the direction of MBG propagates, to being incident upon the G point, A, M, 3 of L have identical Y coordinate, i.e. R/2 at last.

Sunlight shines along the NC direction, the primary event mirror curved surface 11 that forms by curve B CA with sunray to focus L point focusing, focused ray is by after the reflection of secondary reflection mirror curved surface 10, reflexes to once more once on the sensitive surface of the photovoltaic cell 6 that reflective bowl-shaped shell 3 bottoms are provided with.

If the optically focused radiation intensity that the photovoltaic cell of primary event mirror curved surface 11 bottoms 6 its sensitive surfaces receive is n times of normal intensity of solar radiation, be that n is the optically focused radiation intensity that received of photovoltaic cell 6 sensitive surfaces of bottom and the ratio of normal daylight radiation intensity, then have:

∵(n+1)π·r ²＝π·R ²

∴ $R=r\sqrt{(n+1)}$ ①

Under the situation that the photovoltaic cell radius r is determined, when n got different values, can calculate primary event mirror curved surface 11 corresponding cross section curve equations was a parabolic function equation, that is:

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2=\frac{x_2^2}{2R}$ ②

Correspondingly, still as shown in Figure 2, the cross section function curve MDF of reflective mirror curved surface 10 should meet the following conditions:

1, when any light through the incident of N point, reflect by the some C on primary event mirror curved surface 11 cross section curves, assemble to the L point of feeling terribly worried, after some D reflects once more on secondary reflection mirror curved surface 10 cross section curves, shine the some E on photovoltaic cell 6 sensitive surfaces;

2, the reflection loss of primary event mirror curved surface 11 and secondary reflection mirror curved surface 10 is very little and can ignore the time, the radiation intensity of photovoltaic cell 6 sensitive surface any points is identical.

If the C point coordinates is (x ₂, y ₂), the E point coordinates is (x ₁, 0), then the corresponding relation of incident ray and light landing point coordinates is:

$n{\&CenterDot;x}_1^2=x_2^2-{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^2$ ?③

According to 1., 2., 3. formula and light reflection physical law, can be by calculating only secondary reflection mirror curved surface 10 cross section curves of determining that corresponding primary event mirror curved surface 11 light reflection produces, be that secondary reflection mirror curved surface 10 is the function equation curve of light exit point scanning curve MDF, its corresponding Y value also can be calculated definite, according to this curvilinear equation, just can process desired secondary reflection mirror curved surface 10.

As shown in Figure 3, sunray is along the parallel incident of center rotation Y-axis, two secondary reflections through primary event mirror curved surface 11 and secondary reflection mirror curved surface 10, light is radiated on the sensitive surface of photovoltaic cell 6 at last, that is to say that the utility model can only be when Y-axis be pointed to sunlight, under promptly parallel with the sunray situation, just have the concentrating to generate power function, therefore be applicable to and follow the tracks of the generating situation.

As Fig. 4, shown in Figure 5, transparent protective cover plate 1 requires light transmittance very high, can perhaps use the optical plastic manufacturing with sclerosis or toughened glass manufacturing, requires to have waterproof and dustproof and suitable impact resistance function, to adapt to various outdoor harsh weather.Transparent protective cover plate 1 is rounded, and its external diameter is identical with the external diameter of reflective bowl-shaped shell 3 once, and is adhesively fixed with the faying face of reflective bowl-shaped shell 3 outers once.Secondary reflecting body 2 profiles are that the upper end is the solid on plane, and profile also can be a pot shape housing, with its upper end by being adhesively fixed in the center of transparent protective cover plate 1 below.Once reflective bowl-shaped shell 3 lower opening are circular, the sensitive surface of corresponding photovoltaic cell 6.

As shown in Figure 6, set bolt 9 is fixed on once the bottom of reflective bowl-shaped shell 3 to the radiator 8 that is fixed with photovoltaic cell 6 and conducting strip 7, and simultaneously, the below extension screw mandrel of set bolt 9 is used for fixing on the base of reflective bowl-shaped shell 3 bottoms once.By lead a plurality of the utility model are carried out series and parallel and connect, form bigger photovoltaic generating system.

In addition, the utility model is because its reflecting surface is arcuate structure, and under temperature and external force effect, the distortion that difficult generation is bigger helps converging light and keeps evenly; It converges the light hot spot for circular, is applicable to circular silicon materials photovoltaic cell, that is to say, when silicon rod after section, with the circle is that basic configuration is implemented a series of photocell processing technology, need not to be cut into square or squarish, has reduced the generation of offcut; Converge hot spot and be positioned at the bottom of parabolic reflector, lay photovoltaic cell 6 herein, more help fin, the radiating efficiency of raising to photovoltaic cell 6 can be arranged at the bigger area of dissipation of back fixation of photovoltaic cell.

Adopt use double bounce technique provided by the utility model to realize the solar cell power generation device of several times optically focused, have the following advantages: the one, this structure can be easy to realize 3～10 times, even the optically focused of higher multiple ratio; The 2nd, this structure has uniform radiation intensity at photovoltaic cell 6 surperficial each points, helps improving the whole photoelectric conversion efficiency of photovoltaic cell; The 3rd, because two reflectings surface are arcuate structure, under temperature and external force effect, the distortion that difficult generation is bigger helps converging light and keeps evenly; The 4th, converge the light hot spot for circular, be applicable to circular silicon materials photovoltaic cell, that is to say, when silicon rod after section, with the circle is that basic configuration is implemented a series of photovoltaic cell processing technology, need not to be cut into square or squarish, has reduced the generation of offcut; The 5th, converge the bottom that hot spot is positioned at parabolic reflector, lay photovoltaic cell 6 herein, more help fin at the bigger area of dissipation of back fixation of photovoltaic cell, the radiating efficiency of raising to photovoltaic cell 6 can be arranged.

As shown in Figure 2, sunlight shines equably from top, perpendicular to upper surface, after (primary event mirror curved surface 11) paraboloidal reflection, on the secondary reflection face (secondary reflection mirror curved surface 10) in the middle of reflexing to, reflex to again on the photovoltaic cell sensitive surface of bottom.Index path is as shown in Figures 2 and 3:

The radius of bottom receiving plane is OG=r, equates with the radius LM of top secondary reflection face (secondary reflection mirror curved surface 10); The light intensity that the bottom receiving plane receives is n a times of normal light intensity, so the LA=of light receiving surface place radius R,

∵(n+1)π·r ²＝π·R ²

∴ $R=r\sqrt{(n+1)}$

The coordinate of focus L also determines, and promptly (0, R/2), the coordinate of the terminal A of the scan line of a parabolic reflector (primary event mirror curved surface 11) (R, R/2).

The scan line equation of a parabolic reflector (primary event mirror curved surface 11) is:

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2=\frac{x_2^2}{2R}$

The bottom surface of the outer most edge of primary event face (primary event mirror curved surface 11) and secondary reflection face (secondary reflection mirror curved surface 10) is in same plane, be that AML is positioned at once on the focal plane of parabolic (primary event mirror curved surface 11), some L is the focus of a parabolic reflector (primary event mirror curved surface 11).So, shining the light of ordering in A after reflection, should propagate by the aspect of AM, after M point reflects once more, press the direction propagation of MBG.

The problem that will solve is now:

Calculate the function of curve M DF section, be used for the revolution cutting of Digit Control Machine Tool, require to meet the following conditions:

1, curve M DF is through M point, i.e. LM=r;

2, reflex to the M point by the light of A point incident after, meet at the G point;

3, by the light of M point outside incident through the B point reflection to the F point, reflex to initial point O again;

4, arbitrary incident ray NC in the MA scope to the D point, reflexes to the E point through the C point reflection again;

5, at any point of bottom light receiving surface, light ray energy density equates.That is to say that the light intensity in arbitrary zone, bottom is n a times of normal light intensity, that is:

$n\&CenterDot;\mathrm{\&pi;}\&CenterDot;x_1^2=\mathrm{\&pi;}\&CenterDot;x_2^2-\mathrm{\&pi;}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^2$

In the formula, x ₁Be bottom transverse coordinate, x ₂For on parabola with x ₁Abscissa one to one, n is a constant, r is a constant, so have:

$n\&CenterDot;x_1^2=x_2^2-{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^2$

This is the joining of incident ray and the corresponding relation that is subjected to the luminous point coordinate of photovoltaic cell sensitive surface.

According to the corresponding relation of above-mentioned coordinate, can carry out following solving:

If one the function of curve is; F (x, y)=0

For the light NC of any vertical incidence, at (primary event mirror curved surface 11) parabola $y_{}$ ${}_2=\frac{x_2^2}{2R}$ On a coordinate C is all arranged

The slope of line segment LC:

${\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_2=\frac{\frac{x_2^2}{2R}-\frac{R}{2}}{x_2-0}=\frac{\frac{x_2^2}{2R}-\frac{R}{2}}{x_2}$

On curve, the slope that D is ordered is k;

DE is a reflection ray, therefore, and according to reflection law and chamfering formula:

$\tan {\mathrm{\&theta;}}_2=\frac{k_2-\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}{1+{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_2\&CenterDot;k}$ With $\tan {\mathrm{\&theta;}}_1=\frac{k-{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}{1+k\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}_1},$ Should have: $\frac{k_1-\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}{1+{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="H2009201644994E00011.png,H2009201644994E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_2\&CenterDot;k}=\frac{k-{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}{1+k\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009201644994E00031.png"\; state="\{\{state\}\}">k</figure-callout>}}_1},$

Wherein, θ ₁=∠ FDE, θ ₂=∠ MDC;

(x, y)=0 through a M, coordinate is curve f

(x is y)=0 through a M, in the derivative of this point: y '=1 for curve f; (because the light AM of ordering through A reflexes to MG, so the M tangent line of ordering and the angle of x axle are 45 °)

(x is y) with some C (x for some D ₂, y ₂) between corresponding relation be: $\frac{x}{x_2}=\frac{\mathrm{DH}}{\mathrm{CN}}$

Calculate function f (x, form y)=0 according to above-mentioned condition.

Claims (4)

1. device of solar generating that uses double bounce technique to realize several times optically focused, glued membrane (5) will be sealed on the circuit board with the photovoltaic cell (6) that conductive plate (7) are connected, the electric current follower that conductive plate (7) and photovoltaic cell (6) are constituted together is equipped with in the base (12) at mirror surface body bottom opening place, annular waterproof sealing trim ring (4) fitted seal mirror surface body lower ending opening, the setting that matches with photovoltaic cell (6) sensitive surface up of mirror surface body, radiator base plate (13) cooperate and are packed on the base (12) that is positioned at mirror surface body bottom;

The mirror surface body is by secondary reflecting body (2) and once reflective bowl-shaped shell (3) formation that matches, and the primary event mirror curved surface (11) that its internal perisporium of once reflective bowl-shaped shell (3) is provided with is the paraboloid of revolution; Be positioned at once the secondary reflecting body (2) of reflective bowl-shaped shell (3), the secondary reflection mirror curved surface (10) that matches with primary event mirror curved surface (11) is being set on its periphery wall, and the central axial line of the central axial line of this secondary reflection mirror curved surface (10) and primary event mirror curved surface (11) coincides; Once reflective bowl-shaped shell (3) upper end great circle opening is installed sealing by the corresponding transparent protective cover plate (1) that is the disk shape of shape; Corresponding upper end of secondary reflecting body (2) and transparent protective cover plate (1) inner surface Joint, the upper end of secondary reflection mirror curved surface (10) is concordant with the upper end of primary event mirror curved surface (11), secondary reflection mirror curved surface (10) and the corresponding cooperation of primary event mirror curved surface (11), the mutual corresponding matching in position between primary event mirror curved surface (11), secondary reflection mirror curved surface (10) and the photovoltaic cell sensitive surface also forms corresponding bowl-shape cavity, it is characterized in that:

Corresponding incident ray reflexes to secondary reflection mirror curved surface (10) through primary event mirror curved surface (11) and forms the primary event light of reflection first, form again the secondary reflection light of secondary reflection to photovoltaic cell (6) sensitive surface through secondary reflection mirror curved surface (10), all intersect at the optical focus of primary event mirror curved surface (11) top along the line stretcher of primary event light ray propagation direction, primary event mirror curved surface (11) coincides in the Y-axis line with the central axial line of secondary reflection mirror curved surface (10), and the joining that any incident ray and the primary event light that is reflected form on primary event mirror curved surface (11) to the vertical range of Y-axis line is x ₂, be positioned at primary event light and secondary reflection light and go up formation secondary joining at secondary reflection mirror curved surface (10), being positioned at the corresponding vertical range that is subjected to luminous point and Y-axis line that forms on photovoltaic cell (6) sensitive surface of secondary reflection light is x ₁, wherein, photovoltaic cell (6) sensitive surface and X-axis line coincide, and its center of circle overlaps with the origin of coordinates, and disk shape photovoltaic cell (6) sensitive surface is corresponding vertical with the Y-axis line;

Its cross section curve function of the paraboloid of revolution of described primary event mirror curved surface (11) is: $y=x_2^2/2R,$ Wherein, x ₂Go up the known vertical range of a joining of formation to the Y-axis line, 0＜x for being positioned at incident ray and primary event light at primary event mirror curved surface (11) ₂≤ R, R are internal perisporium primary event mirror curved surface (11) upper end radius;

The functional relation that satisfies between primary event mirror curved surface (11) upper end radius R and secondary reflection mirror curved surface (10) the tip radius r is:

$R=r\sqrt{(n+1)},$ Wherein, n is photovoltaic cell (6) the optically focused radiation intensity that sensitive surface received of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell (6);

The known x of primary event mirror curved surface (11) paraboloid of revolution cross section function curve then ₂Value and each are subjected to the luminous point position to locate corresponding known x ₁The functional relation that satisfies between the value is:

$n\&CenterDot;x_1^2=x_2^2-r^2,$ Wherein, n is photovoltaic cell (6) the optically focused radiation intensity that sensitive surface received of bottom and the ratio of incident solar radiation intensity, and r also is the radius of disk shape photovoltaic cell (6), according to each known x ₂The value correspondence can be learnt respective x ₁Value;

On secondary reflection mirror curved surface (10), follow the known coordinate value of function curve line segment on it in the law of light reflection and secondary reflection mirror curved surface (10) cross section according to incident ray and second incident light line,

The curvilinear function in its cross section of secondary reflection mirror curved surface (10) is the corresponding one by one curve of coordinate figure of its respective coordinate value and paraboloid of revolution cross section function curve track.

2. use double bounce technique according to claim 1 is realized the device of solar generating of several times optically focused, it is characterized in that: its upper end of the function curve line segment in secondary reflection mirror curved surface (10) cross section really the position fixing value for (r, R/2), r≤x ₂≤ R.

3. use double bounce technique according to claim 1 is realized the device of solar generating of several times optically focused, and it is characterized in that: radiator is the fin (8) perpendicular to base (12) base plate face of uniform setting on radiator base plate (13) lower face.

4. use double bounce technique according to claim 1 is realized the device of solar generating of several times optically focused, and it is characterized in that: transparent protective cover plate (1) is made of optical plastic or optical glass.

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