WO2013182981A1 - Photovoltaic lighting device and lighting system using the same - Google Patents
Photovoltaic lighting device and lighting system using the same Download PDFInfo
- Publication number
- WO2013182981A1 WO2013182981A1 PCT/IB2013/054585 IB2013054585W WO2013182981A1 WO 2013182981 A1 WO2013182981 A1 WO 2013182981A1 IB 2013054585 W IB2013054585 W IB 2013054585W WO 2013182981 A1 WO2013182981 A1 WO 2013182981A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission member
- light transmission
- photovoltaic cell
- photovoltaic
- optical assembly
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
Definitions
- the present invention essentially relates to a photovoltaic lighting device as well as a lighting system using the same.
- the present invention relates to a photovoltaic lighting device which allows both the sunlight transmission for room lighting and the production photovoltaic of electrical energy to be simultaneously obtained.
- the device further allows to recover most of the energy which is wasted in known lighting devices because of the mechanisms for the injection of the light radiation in light transmission members.
- Such devices generally consist of one or more light transmitter members associated with optical members adapted to concentrate the sunlight radiation on one end of the same transmission member, and are installed on supporting structures also provided with sun tracking means.
- Such light transmission members may consist, for example, of optical fibers, solid or hollow light guides, and the like.
- the optical members for light radiation concentration may consist of lenses, mirrors, and the like.
- the wasted radiation i.e. the radiation not conveyed into the fiber, generally ends up heating the zone contiguous thereto, and is lost in the form of heat, thus determining an evident loss in terms of energy and further requiring the use of suitable heat sinks which preserve the integrity and the correct functioning of both the device and the supporting structure.
- optical members, supporting structures and tracking means may be used, which have high machining and operating precisions, but which are thus very expensive.
- the technical task of the present invention is thus to provide a photovoltaic lighting device which simultaneously allows the light radiation to be transmitted where it is required while recovering the energy wasted by the solar radiation injection in a light transmission member of the device.
- Such a device can advantageously be applied in lighting systems as set out in the appended claims 16-20.
- FIG. 1 is a perspective view of a photovoltaic lighting device, according to the present invention, showing a cell and a light transmission member;
- FIG. 2 is a side view of a photovoltaic lighting device, according to the present invention, showing a cell, a light transmission member and an optical assembly.
- reference numeral 1 indicates as a whole a photovoltaic lighting device according to the present invention.
- the photovoltaic lighting device 1 comprises at least one light transmission member 2 and at least one photovoltaic cell 3 provided with at least one through hole 4; at least one end portion of the light transmission member 2 is coupled in the through hole 4 of the photovoltaic cell 3 so as to simultaneously allow room lighting and electrical energy production, due to at least the solar radiation intercepted respectively by the coupled light transmission member 2 and photovoltaic cell 3 coupled together.
- Hole 4 may be made either as a proper through hole of the cell or by flanking at least two portions of the photovoltaic cell; for example if two flanking cells are used, one or both cells may have a side groove; for example if four flanking cells are used, one or two or three or four of the cells may have a side groove or bevel.
- the device further comprises at least one optical assembly 5 adapted to concentrate the solar radiation on the light transmission member 2 and/or photovoltaic cell 3 coupled together; for example, such an optical assembly 5 may consist of at least one lens or even of at least one mirror; as will be explained below, according to some embodiments of the present invention, it may be useful to choose if the light has to be directed essentially to the transmission member (although a part of the light beam will be typically intercepted by the area of the photovoltaic cell immediately adjacent to the through hole) or essentially to the photovoltaic cell or both; according to typical embodiments of the present invention, the optical assembly only consists of a lens which does not have any particular precision requirements in terms of external surfaces and material thereof.
- Said light transmission member 2 preferably consists of at least one optical fiber, a end of which is inserted into the hole 4 of the photovoltaic cell 3, and coupled thereto so as to protrude or, preferably, flush with the external surface of cell 3.
- the diameter of the optical fiber may be for example 0.4 mm or 0.6 mm or 0.8 mm (or intermediate values)
- the side (if square) or diameter (if circular) of the photovoltaic cell may be for example 4 mm or 6 mm or 8 mm (or intermediate values).
- the ratio of the cell diameter and the fiber diameter may be for example 8 or 10 or 12 (or intermediate values). Therefore, the most typical embodiments of the present invention include small-sized photovoltaic cells.
- Hole 4 is made in cell 2, which is preferably square in shape, as it is shown in the figures; this does not mean that it may not be circular, rectangular or of yet other shapes.
- the light transmission member 2 may consist of a plurality of optical fibers associated with the hole 4 of the photovoltaic cell 3.
- the light transmission member 2 may consist of at least a solid or hollow light guide, or even by a plurality of light guides, made of synthetic materials having suitable optical/mechanical features.
- cell 3 may comprise a plurality of holes 4 for coupling respective light transmission members 2.
- the coupling of the light transmission member 2 to cell 3 may occur in multiple ways, and for example may be achieved by gluing, or by mechanical interference, by screw-type means, and so on.
- the light transmission member 2 may further comprise a gripping portion 6 for the user in order to facilitate its coupling to cell 3 and to facilitate the mounting operation.
- Device 1 may be installed on a supporting structure also provided with sun tracking means (the supporting structure and the tracking means are of known type and not shown in the figures); in particular, the photovoltaic cell 3 and/or the optical assembly 5 are mounted to the tracking means; according to typical embodiments of the present invention, the precision of the tracking means is not critical also because of and due to the association and coupling of member 2 and cell 3.
- photovoltaic lighting device 1 The operation of photovoltaic lighting device 1 according to the invention is entirely user friendly according to the above description.
- the solar radiation is collected by an optical assembly 5 and concentrated by the same on the photovoltaic cell 3 and in particular on the light transmission member 2, which as mentioned preferably consists of an optical fiber, and which allows the light radiation to be transmitted in the desired rooms.
- the geometry of the optical assembly 5, and in general of device 1 is as mentioned adapted to concentrate the visible light radiation on the end of the optical fiber, while the photovoltaic cell 3 intercepts the part of the light radiation not collected by the optical fiber, i.e., it recovers the energy which is inevitably partly dispersed by the injection into the optical fiber of the light radiation, turning it into electrical energy. It should be noted that in the embodiment in Figure 2, the distance between lens 5 and cell 3 is constant.
- the photovoltaic lighting device 1 due to the light transmission member 2, allows to suitably illuminate rooms, and how, due to cell 3, it allows to intercept the part of the solar radiation (concentrated by the optical assembly 5) not collected by the fiber and to immediately convert it into electrical energy, without it being lost in the form of heat as it occurs in conventional devices.
- the invention thus conceived allows to achieve important technical advantages, in that the presence of the photovoltaic cell 3 allows to use optical members, tracking members and supporting structures (and respective geometries) which no longer have to necessarily concentrate 100% of the solar radiation within the limited diameter of the fiber, thus achieving multiple advantages (even in economic terms): the energy lost is recovered by converting it into direct current, and not too high (and therefore less expensive) machining precisions of the concentration optical members 5, tracking means and supporting structure are required.
- Such a photovoltaic lighting device may typically be used in lighting systems.
- Such systems may comprise only one device or a plurality of devices, for example a number in the range from 25 to 100 disposed as a square or as a rectangle or according to an invented shape.
- a lens which may have a diameter of 40-60 mm, for example.
- the lighting system according to the present invention may comprise an electrical accumulator connected to the photovoltaic cell, an optical light source connected to the output of said light transmission member, and an electrical light source connected to said electrical accumulator.
- Te optical light source and the electrical light source are typically oriented to illuminate the same area; thereby, the two light sources are associated.
- the lighting system according to the present invention also preferably comprises an electronic control unit adapted to adjust the brightness of the electrical light source; thereby, ensuring the same brightness regardless of the solar radiation conditions is possible; this may be very advantageous in the case of abrupt variations of the solar radiation (passing of clouds).
- the lighting system comprises orientation means of the optical assembly and a corresponding electronic control unit which is adapted to control the orientation means so as to selectively orientate said optical assembly towards the inlet of the light transmission member.
- the orientation means and the tracking means may be obtained from the same assembly of electro-mechanical devices. It is worth noting that a single electronic control unit may control more than one function of the lighting system.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
The photovoltaic lighting device (1) comprises at least one light transmission member (2) and at least one photovoltaic cell (3) provided with at least one through hole (4); at least one end portion of the light transmission member (2) is coupled in the through hole (4) of the photovoltaic cell (3) so as to simultaneously allow room lighting and electrical energy production, thanks to at least the solar radiation intercepted respectively by the light transmission member (2) and the photovoltaic cell (3) coupled together.
Description
PHOTOVOLTAIC LIGHTING DEVICE AND LIGHTING SYSTEM USING THE SAME
Field of the invention
The present invention essentially relates to a photovoltaic lighting device as well as a lighting system using the same.
In particular, the present invention relates to a photovoltaic lighting device which allows both the sunlight transmission for room lighting and the production photovoltaic of electrical energy to be simultaneously obtained. The device further allows to recover most of the energy which is wasted in known lighting devices because of the mechanisms for the injection of the light radiation in light transmission members.
Background art
In the field of lighting, devices are known which allow the light radiation to be transmitted in rooms which are not or poorly reached by ambient light.
Such devices generally consist of one or more light transmitter members associated with optical members adapted to concentrate the sunlight radiation on one end of the same transmission member, and are installed on supporting structures also provided with sun tracking means. Such light transmission members may consist, for example, of optical fibers, solid or hollow light guides, and the like.
The optical members for light radiation concentration may consist of lenses, mirrors, and the like.
Known devices well serve the task of transmitting light radiation in rooms where required, however they have some drawbacks particularly due to the fact that not all the radiation from the sun is conveyed from the optical assembly to the end of the light transmission member, which in particular in the case of an optical fiber has particularly small diameter.
Therefore, the wasted radiation, i.e. the radiation not conveyed into the fiber, generally ends up heating the zone contiguous thereto, and is lost in the form of heat, thus determining an evident loss in terms of energy and further requiring the use of suitable heat sinks which preserve the integrity and the correct functioning
of both the device and the supporting structure.
In order to attempt to reduce the light radiation waste outside the end of the light transmission member, and thus limit the energy loss, optical members, supporting structures and tracking means may be used, which have high machining and operating precisions, but which are thus very expensive.
However, even in this way, it is not possible to concentrate 100% of the light radiation within the end of the light transmission member, also because it is necessary to take into account the focusing/pointing errors of the optical assembly not only due to the machining precision of the same, but also caused by vibrations, abnormal refractions of the atmosphere, errors due to the tracking means, and the like.
Objects of the invention
The technical task of the present invention is thus to provide a photovoltaic lighting device which simultaneously allows the light radiation to be transmitted where it is required while recovering the energy wasted by the solar radiation injection in a light transmission member of the device.
Within the scope of such a technical task, it is a particular object of the present invention to provide a photovoltaic lighting device which does not require expensive heat sinks.
It is a further object of the present invention to provide a photovoltaic lighting device which is easy to be manufactured and employed, and quick to be used. This task and these objects are achieved by the photovoltaic lighting device according to the appended claim 1.
Further advantageous features of the device are set out in the appended dependent claims.
Such a device can advantageously be applied in lighting systems as set out in the appended claims 16-20.
Brief description of the drawings
The features of the invention will be better understood by a man skilled in the art considering the following description and the accompanying drawings, provided by way of non-limiting example of embodiment of the present invention, in which: - Figure 1 is a perspective view of a photovoltaic lighting device, according to the
present invention, showing a cell and a light transmission member;
- Figure 2 is a side view of a photovoltaic lighting device, according to the present invention, showing a cell, a light transmission member and an optical assembly. Embodiments of the invention
With reference to the accompanying figure 1 , reference numeral 1 indicates as a whole a photovoltaic lighting device according to the present invention.
The photovoltaic lighting device 1 comprises at least one light transmission member 2 and at least one photovoltaic cell 3 provided with at least one through hole 4; at least one end portion of the light transmission member 2 is coupled in the through hole 4 of the photovoltaic cell 3 so as to simultaneously allow room lighting and electrical energy production, due to at least the solar radiation intercepted respectively by the coupled light transmission member 2 and photovoltaic cell 3 coupled together.
Hole 4 may be made either as a proper through hole of the cell or by flanking at least two portions of the photovoltaic cell; for example if two flanking cells are used, one or both cells may have a side groove; for example if four flanking cells are used, one or two or three or four of the cells may have a side groove or bevel. The device further comprises at least one optical assembly 5 adapted to concentrate the solar radiation on the light transmission member 2 and/or photovoltaic cell 3 coupled together; for example, such an optical assembly 5 may consist of at least one lens or even of at least one mirror; as will be explained below, according to some embodiments of the present invention, it may be useful to choose if the light has to be directed essentially to the transmission member (although a part of the light beam will be typically intercepted by the area of the photovoltaic cell immediately adjacent to the through hole) or essentially to the photovoltaic cell or both; according to typical embodiments of the present invention, the optical assembly only consists of a lens which does not have any particular precision requirements in terms of external surfaces and material thereof.
Said light transmission member 2 preferably consists of at least one optical fiber, a end of which is inserted into the hole 4 of the photovoltaic cell 3, and coupled thereto so as to protrude or, preferably, flush with the external surface of cell 3.
By way of illustration, the diameter of the optical fiber may be for example 0.4 mm or 0.6 mm or 0.8 mm (or intermediate values), while the side (if square) or diameter (if circular) of the photovoltaic cell may be for example 4 mm or 6 mm or 8 mm (or intermediate values). In other words, by way of illustration, the ratio of the cell diameter and the fiber diameter may be for example 8 or 10 or 12 (or intermediate values). Therefore, the most typical embodiments of the present invention include small-sized photovoltaic cells.
Hole 4 is made in cell 2, which is preferably square in shape, as it is shown in the figures; this does not mean that it may not be circular, rectangular or of yet other shapes.
In another embodiment of device 1 (not shown in the figures), the light transmission member 2 may consist of a plurality of optical fibers associated with the hole 4 of the photovoltaic cell 3.
In further embodiments of the device (not shown in the figures), the light transmission member 2 may consist of at least a solid or hollow light guide, or even by a plurality of light guides, made of synthetic materials having suitable optical/mechanical features.
In a different embodiment of device 1 (not shown in the figures), cell 3 may comprise a plurality of holes 4 for coupling respective light transmission members 2.
The coupling of the light transmission member 2 to cell 3 may occur in multiple ways, and for example may be achieved by gluing, or by mechanical interference, by screw-type means, and so on.
The light transmission member 2 may further comprise a gripping portion 6 for the user in order to facilitate its coupling to cell 3 and to facilitate the mounting operation.
Device 1 , or an arrangement of devices 1 , may be installed on a supporting structure also provided with sun tracking means (the supporting structure and the tracking means are of known type and not shown in the figures); in particular, the photovoltaic cell 3 and/or the optical assembly 5 are mounted to the tracking means; according to typical embodiments of the present invention, the precision of the tracking means is not critical also because of and due to the association and
coupling of member 2 and cell 3.
The operation of photovoltaic lighting device 1 according to the invention is entirely user friendly according to the above description.
The solar radiation is collected by an optical assembly 5 and concentrated by the same on the photovoltaic cell 3 and in particular on the light transmission member 2, which as mentioned preferably consists of an optical fiber, and which allows the light radiation to be transmitted in the desired rooms.
More in detail, the geometry of the optical assembly 5, and in general of device 1 , is as mentioned adapted to concentrate the visible light radiation on the end of the optical fiber, while the photovoltaic cell 3 intercepts the part of the light radiation not collected by the optical fiber, i.e., it recovers the energy which is inevitably partly dispersed by the injection into the optical fiber of the light radiation, turning it into electrical energy. It should be noted that in the embodiment in Figure 2, the distance between lens 5 and cell 3 is constant.
Such a dispersion, caused by the focusing/pointing errors of the optical assembly 5 due to the machining precision thereof, to vibrations, abnormal refractions of the atmosphere, errors due to the tracking means, and the like, is in any case recovered as mentioned by the photovoltaic cell 3. It should be noted that with accurate geometries of the concentration optical assembly 5, it will be possible to favor the injection of the bright part of the solar radiation into the transmission member 3, at the expense of the part which is not visible to the naked eye, which instead may be preferably directed to the photovoltaic cell 3, further increasing the overall efficiency of device 1.
It has therefore been shown how the photovoltaic lighting device 1 , due to the light transmission member 2, allows to suitably illuminate rooms, and how, due to cell 3, it allows to intercept the part of the solar radiation (concentrated by the optical assembly 5) not collected by the fiber and to immediately convert it into electrical energy, without it being lost in the form of heat as it occurs in conventional devices.
Thereby, the use of heat sinks is further avoided, with apparent advantages even in economic terms.
The invention thus conceived allows to achieve important technical advantages, in
that the presence of the photovoltaic cell 3 allows to use optical members, tracking members and supporting structures (and respective geometries) which no longer have to necessarily concentrate 100% of the solar radiation within the limited diameter of the fiber, thus achieving multiple advantages (even in economic terms): the energy lost is recovered by converting it into direct current, and not too high (and therefore less expensive) machining precisions of the concentration optical members 5, tracking means and supporting structure are required.
It has thus been seen that the photovoltaic lighting device according to the invention achieves the intended objects.
Such a photovoltaic lighting device may typically be used in lighting systems.
Such systems may comprise only one device or a plurality of devices, for example a number in the range from 25 to 100 disposed as a square or as a rectangle or according to an invented shape. According to typical embodiments, at each photovoltaic cell there is a lens which may have a diameter of 40-60 mm, for example.
The lighting system according to the present invention may comprise an electrical accumulator connected to the photovoltaic cell, an optical light source connected to the output of said light transmission member, and an electrical light source connected to said electrical accumulator. Te optical light source and the electrical light source are typically oriented to illuminate the same area; thereby, the two light sources are associated.
The lighting system according to the present invention also preferably comprises an electronic control unit adapted to adjust the brightness of the electrical light source; thereby, ensuring the same brightness regardless of the solar radiation conditions is possible; this may be very advantageous in the case of abrupt variations of the solar radiation (passing of clouds).
It may also be envisioned that the lighting system comprises orientation means of the optical assembly and a corresponding electronic control unit which is adapted to control the orientation means so as to selectively orientate said optical assembly towards the inlet of the light transmission member. The orientation means and the tracking means may be obtained from the same assembly of electro-mechanical devices.
It is worth noting that a single electronic control unit may control more than one function of the lighting system.
The present invention has been described according to preferred embodiments, but equivalent variants may be conceived without departing from the scope of protection provided by the following claims.
Claims
1. Photovoltaic lighting device (1 ), characterized in that it comprises at least one light transmission member (2) and at least one photovoltaic cell (3) provided with at least one through hole (4), at least an end portion of said light transmission member (2) being coupled in said through hole (4) to said photovoltaic cell (3) so as to simultaneously allow room lighting and electrical energy production, thanks to at least the solar radiation intercepted respectively by said light transmission member (2) and said photovoltaic cell (3) coupled together.
2. Device according to claim 1 , wherein said through hole (4) is made by flanking at least two photovoltaic cell portions, in particular by flanking two or four photovoltaic cell portions.
3. Device according to claim 1 or 2, comprising at least one optical assembly (5) adapted to concentrate the solar radiation on said light transmission member (2) and/or said photovoltaic cell (3) coupled together.
4. Device according to any one of the preceding claims, wherein said light transmission member (2) consists of at least one optical fiber.
5. Device according to any one of the preceding claims, wherein said light transmission member (2) consists of a plurality of optical fibers.
6. Device according to any one of the preceding claims, wherein said light transmission member (2) consists of at least one solid or hollow light guide.
7. Device according to any one of the preceding claims, wherein said cell (3) comprises a plurality of through holes (4) for coupling respective light transmission members (2).
8. Device according to any one of the preceding claims from 1 to 7, wherein said light transmission member (2) is coupled to said photovoltaic cell (3) by gluing.
9. Device according to any one of the preceding claims from 1 to 7, wherein said light transmission member (2) is coupled to said photovoltaic cell (3) by mechanical interference.
10. Device according to any one of the preceding claims from 1 to 7, wherein said light transmission member (2) is coupled to said photovoltaic cell (3) by means of screw-type means.
11. Device according to any one of the preceding claims, wherein said optical assembly (5) comprises a lens.
12. Device according to any one of the preceding claims, wherein said optical assembly (5) comprises a mirror.
13. Device according to any one of the preceding claims from 1 to 10, wherein said optical assembly (5) only consists of a lens.
14. Device according to any one of the preceding claims, comprising sun tracking means, wherein said photovoltaic cell (3) is mounted to said sun tracking means.
15. Device according to any one of the preceding claims, comprising sun tracking means, wherein said optical assembly (5) is mounted to said sun tracking means.
16. Lighting system comprising at least one photovoltaic lighting device according to any one of the preceding claims from 1 to 15.
17. Lighting system according to claim 16, comprising an electrical accumulator connected to said photovoltaic cell (3), an optical light source connected to the output of said light transmission member (2), and an electrical light source connected to said electrical accumulator.
18. Lighting system according to claim 17, wherein said optical light source and said electrical light source are oriented so as to illuminate the same area.
19. Lighting system according to claim 18, comprising an electronic control unit adapted to adjust the brightness of said electrical light source.
20. Lighting system according to claim 17 or 18 or 19, comprising means for orienting said optical assembly (5) and an electronic control unit, wherein said electronic control unit is adapted to control said orientation means so as to selectively orientate said optical assembly (5) towards the inlet of said light transmission member (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000302A ITBO20120302A1 (en) | 2012-06-04 | 2012-06-04 | PHOTOVOLTAIC LIGHTING DEVICE |
| ITBO2012A000302 | 2012-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013182981A1 true WO2013182981A1 (en) | 2013-12-12 |
Family
ID=46548579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2013/054585 WO2013182981A1 (en) | 2012-06-04 | 2013-06-04 | Photovoltaic lighting device and lighting system using the same |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITBO20120302A1 (en) |
| WO (1) | WO2013182981A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7188986B1 (en) * | 2006-01-03 | 2007-03-13 | Ronald Paul Harwood | Illuminated sign |
| CN201827822U (en) * | 2010-09-14 | 2011-05-11 | 黄竞磊 | Dual-lens condensed light and parallel light transmission sunlamp illuminator |
| US20110310596A1 (en) * | 2010-06-21 | 2011-12-22 | William Ahmadi | 360 degree angular LED lighting |
-
2012
- 2012-06-04 IT IT000302A patent/ITBO20120302A1/en unknown
-
2013
- 2013-06-04 WO PCT/IB2013/054585 patent/WO2013182981A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7188986B1 (en) * | 2006-01-03 | 2007-03-13 | Ronald Paul Harwood | Illuminated sign |
| US20110310596A1 (en) * | 2010-06-21 | 2011-12-22 | William Ahmadi | 360 degree angular LED lighting |
| CN201827822U (en) * | 2010-09-14 | 2011-05-11 | 黄竞磊 | Dual-lens condensed light and parallel light transmission sunlamp illuminator |
Also Published As
| Publication number | Publication date |
|---|---|
| ITBO20120302A1 (en) | 2013-12-05 |
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