NL2025841B1

NL2025841B1 - Inductive lighting system

Info

Publication number: NL2025841B1
Application number: NL2025841A
Authority: NL
Inventors: De Angelis Jimmy
Original assignee: Schreder Sa
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2022-02-16

Abstract

A lighting system comprising: a power supply generating electrical power provided to a primary wire forming a current loop; inductive modules receiving said electrical power; an envelope receiving the primary wire therein. The inductive modules includes: an electromagnetic coupling means providing current to a functional unit, said functional unit connected to a secondary wire. The electromagnetic coupling means comprises: a magnetic core receiving the current loop; the secondary wire wound around a portion of the magnetic core and coupling inductively to the primary wire. At least one of the inductive modules comprises a functional unit corresponding to a lighting unit with a light source. The inductive modules comprises a housing at least partially enclosing the electromagnetic coupling means, and provided with a through-hole corresponding to a central hole of the magnetic core. The envelope extends through the through-hole of the housing, and supports the inductive modules arranged onto it.

Description

INDUCTIVE LIGHTING SYSTEM

FIELD OF INVENTION The field of the invention relates to lighting systems, preferably for outdoor lighting or industrial lighting. Particular embodiments relate to a lighting system powered inductively.

BACKGROUND Domestic lighting system which are supplied in power via an inductive power supply device are well known but are not well adapted for uses requiring an installation with a stable fixation, such as in outdoor lighting or industrial lighting for example, due to the differences in constraints in terms of characteristics of the lighting provided in a demanding environment, or in terms of the infrastructure providing power. Typically, the inductive domestic lighting systems are developed based on aesthetical considerations and forego more practical considerations. In particular, one of the aspects which is not transposable to a demanding environment from domestic lighting systems is the base support for the luminaire head. Indeed, the environment indoors is generally controlled and risk-free, while the environmental conditions are ever changing in an outdoor situation. Also, the sole purpose of domestic lighting systems is illumination. This situation must be remedied for when considering a lighting system powered inductively where fixation stability, adaptability, and multi-purpose use are parameters to take into account.

SUMMARY The object of embodiment of the invention is to provide a lighting system, preferably for outdoor lighting or industrial lighting, powered inductively allowing for a modular and user-friendly installation, and with a stable support for the illumination. Such lighting system and inductive power supply device are advantageous for a number of applications, e.g. temporary lighting, events lighting, modular lighting, and environments, e.g. outdoor environment, industry halls, warehouses, construction sites. Additionally, it would be advantageous to obtain a multi-purpose inductive lighting system to adapt to different uses.

According to a first aspect of the invention, there is provided a lighting system, preferably for outdoor lighting or industrial lighting. The lighting system comprises a power supply and a plurality of inductive modules. The power supply is configured for generating electrical power provided to a primary wire forming a current loop. The plurality of inductive modules is configured for receiving power from the power supply. Each of the plurality of inductive modules includes an electromagnetic coupling means and a functional unit. The electromagnetic coupling means comprises a magnetic core configured for receiving the current loop of the primary wire, and a secondary wire wound around a portion of the magnetic core and configured for coupling inductively to the primary wire. The functional unit is connected to the secondary wire. The electromagnetic coupling means is configured for providing current to the functional unit. At least one inductive module of the plurality of inductive modules comprises a functional unit corresponding to a lighting unit with at least one light source, preferably at least one light emitting diode. Each of the plurality of inductive modules further comprises a housing configured for at least partially enclosing the electromagnetic coupling means, said housing being provided with a through-hole corresponding to a central hole of the magnetic core. The lighting system further comprises an envelope configured for receiving the primary wire therein, said envelope configured for extending through the through-hole of the housing. After arranging the plurality of inductive modules onto the envelope of the power supply, the envelope supports the plurality of inductive modules. In the lighting system according to the invention, the power supply provides AC power to the primary wire. The plurality of inductive modules receives the AC power from the primary wire via the secondary wire due to the electromagnetic induction phenomenon using the magnetic core of the electromagnetic means.

Since the power is supplied to the plurality of inductive modules using the electromagnetic induction phenomenon, there is no need for a physical coupling between the power supply and the plurality of inductive modules using wires for example. Thus, the plurality of inductive modules may be easily installed and positioned without complex electrical wiring required. It contributes to a high modularity of the system in terms of installation, while installing as well as after installation. For example, depending on the implementation of the system, additional inductive modules may easily be provided to the lighting system and at least one of the inductive modules may be displaced to another area of interest neighboring the lighting system.

Through the functional unit of the inductive module, different functions may be provided to the lighting system which gains in modularity. There may be one function imparted per inductive module, or one inductive module may comprise a plurality of functional units with different functions. For example, the functional unit may be any one of: a lighting unit, a display unit, an antenna unit, a sensing unit, a speaker unit, an air cleaning unit such as a UV light source, etc. The sensing unit may comprise a pollution sensor, a motion sensor, a humidity sensor, a light sensor, a temperature sensor, a visibility sensor, an image capturing sensor, a radar sensor, a sound sensor, a voice recorder, a CO2 sensor, a NOx sensor, a SOx sensor, a smoke sensor, a biological threat sensor, an infrared sensor, a thermal sensor. It is also to be noted that the inductive module with the lighting unit may also comprise additional functional units with different functions in addition to a lighting function.

Further, since the primary wire is received within the envelope extending through the through-hole of the housing, the plurality of inductive modules are supported in a stable manner in an environment with adverse conditions. The envelope may be shaped to accommodate for the intended illumination.

In an embodiment, the envelope is made in a single piece, e.g. as a flexible sheath to the primary wire, and the plarality of inductive modules may be arranged one after the other onto the envelope to be positioned in place. In another embodiment, the envelope is made of a plurality of portions configured for being assembled one to the other and the plurality of inductive modules may be arranged onto a corresponding envelope portion before assembly of the envelope portions together.

The lighting system above may be adapted for outdoor lighting or industrial lighting. By outdoor lighting and industrial lighting, it is meant lighting adapted for roads, tunnels, industrial plants, stadiums, airports, harbors, rail stations, campuses, parks, cycle paths, pedestrian paths, or pedestrian zones for example, and industrial and outdoor lighting systems can be used notably for the lighting of an outdoor area, such as roads and residential areas in the public domain, private parking areas and access roads to private building infrastructures, warehouses, industry halls, etc. According to a preferred embodiment, the envelope is a rigid envelope.

In this manner, support of the plurality of inductive modules may be improved.

According to an exemplary embodiment, the trough-hole is configured for cooperating with the envelope to position the inductive module in a plurality of predetermined positions with respect to the envelope.

By this approach, an orientation of the inductive module may be adjusted to be better suited to the needs and/or environment of the lighting system. Depending on embodiments, the adjustment in orientation may be performed before or after arranging the inductive module onto the envelope.

According to a preferred embodiment, the housing comprises an inner peripheral wall and an outer peripheral wall substantially surrounding the inner peripheral wall Preferably, the magnetic core may be located between the inner peripheral wall and the outer peripheral wall. To favor inductive coupling, the inner peripheral wall of the through-hole may be made of a non-magnetic material, e.g. plastic, aluminum, and a corresponding portion of the envelope may also be made of a non-magnetic material, ¢.g. plastic, aluminum. In this way, the protection given by the enclosure of the housing is improved.

According to an exemplary embodiment, the inner peripheral wall of the housing is delimiting the through-hole, said inner peripheral wall being configured to be rotatable around the envelope.

In this manner, rotation motions of the plurality of inductive modules are not impinged by the inner peripheral wall of the housing in contact with the envelope. The inner peripheral wall may preferably comprise a continuous surface and may correspond in dimensions with dimensions of the envelope. The inner peripheral wall may promote motions of the plurality of inductive modules around the envelope, thereby preventing damage due to an undue resistance of the plurality of inductive modules when faced with strong winds for example.

According to an exemplary embodiment, the housing has an inner peripheral wall with an external surface delimiting the through-hole. The external surface defines a profile including a first edge. The envelope has an external surface defining a profile including a second edge configured for cooperating with the first edge. When arranging the housing onto the envelope, the housing is arranged in a predetermined position with respect to the envelope, as seen in a plane perpendicular to an axis of the through-hole.

In this manner, by aligning the first edge and the second edge, rotation of the plurality of inductive modules around the envelope is prevented and the orientation related to the functionality of the plurality of inductive modules may be kept despite adverse environment conditions.

Note that although the presence of a single edge may be sufficient to prevent rotation, the external surface of the through-hole may comprise multiple edges and define a regular or an irregular polygonal shape, e.g. a triangle, a square, a pentagon, a hexagon, etc.

In an embodiment, the external surface of the through-hole has a regular octagon profile, and the external surface of the envelope defines a corresponding regular octagon profile. When arranging an inductive module of the plurality of inductive modules onto the envelope, the overall orientation of said inductive module may be adjusted in steps of 45° thanks to the octagon profile with respect to the envelope. The adjustment in steps may be achieved by a discrete rotation of the inductive module with respect to a main axis of the envelope prior to the arrangement of the inductive module onto the envelope.

5 According to a preferred embodiment, the inner peripheral wall has an external surface which is substantially complementary to an external surface of the envelope. In this way, the arrangement of the plurality of inductive modules onto the envelope has minimized freedom of movements in a plane perpendicular to the axis of the through-hole, therefore improving the stability and position of the lighting system installation. By complementary, it is meant a substantial match in shape and dimensions between the external surface of the inner peripheral wall and the external surface of the envelope to minimize an empty space volume between both external surfaces.

According to an exemplary embodiment, the inner peripheral wall is substantially cylindrical.

In this manner, the shape of said inner peripheral wall may be kept simple from a design point of view while enabling rotation.

According to a preferred embodiment, the outer peripheral wall is provided with a support configured for supporting at least partially the functional unit, preferably for supporting the at least one light source.

In this way, an orientation of the at least one light source may be well defined in function of the underlying support. Alternatively, a different functional unit may be provided to the support and the support may be configured to be suited for the arrangement of said functional unit or a part of said functional unit.

According to an exemplary embodiment, the support is shaped as a wing, preferably integrated with the outer peripheral wall. In this manner, a profile of the outer peripheral wall may be less prone to air movements. Also, the wing shape may comprise a substantially flat surface onto which an element of the functional unit, e.g. the at least one light source, may be provided.

According to a preferred embodiment, the wing extends in a plane substantially parallel to an axis of the through-hole. In this way, the overall shape of the outer peripheral wall may be simplified.

According to an exemplary embodiment, the wing extends at least partially below the through- hole. In this manner, the center of gravity of the inductive module may be located below the envelope which improves the positioning stability of the inductive module.

According to a preferred embodiment, the wing extends from an area in a horizontal plane extending through the through-hole to an area vertically below the through-hole.

In this way, a relevant part of the functional unit, e.g. the at least one light source, may be oriented towards the ground due to a favorable weight balance.

According to an exemplary embodiment, the housing is slidable over the envelope.

In this manner, the inductive module may be easily installed and positioned within the lighting system, which improves the overall modularity of the system especially to adapt to changes in use and environments. Additionally, the slidable surfaces in contact may be provided with a given roughness to improve or prevent a motion along the envelope of the inductive module. In an embodiment, the envelope may be provided with surfaces having different roughness to define slidable portions.

According to another embodiment, the lighting system further comprises a fixation means, preferably a clamping means, configured for fixing a position of at least one of the inductive modules with respect to the envelope.

It may advantageously provide to the lighting system a means of preventing the inductive module from moving transversally along the envelope and/or for rotating around the envelope. The fixation means may be configured for getting fixed relative to the envelope mechanically and/or chemically. The fixation means may be fixed independently from the inductive module and serves as stop to the inductive module or may fix directly the inductive module to the envelope. According to different embodiments, the fixation means may be an element separate from the inductive module and the envelope, may be comprised in the housing, or may be comprised in the envelope. In an embodiment, the inductive module may be slid along the envelope and/or rotated around the envelope to a desired position before being fixed in said desired position using the fixation means.

According to a preferred embodiment, the envelope comprises one or more tube portions. In this way, the length and shape of the envelope may be easily modulated according to the needs, e.g. the lighting needs, of the installation site. For example, the one or more tube portions may be categorized into curved portions and straight portions serving as building blocks for the envelope. The one or more tube portions may be assembled together mechanically, e.g. bayonet mount, screwing mount, fitting mount, and/or chemically, e.g. glue. Additionally, the tube portion may comprise sections delimited by shoulders, said sections configured for restraining motions of the inductive module along the tube portion of the envelope when the one or more tube portions are assembled together. According to an exemplary embodiment, at least one of the plurality of inductive modules further comprises a balancing means, said balancing means being provided to the housing of the inductive module; and, when orienting the envelope substantially horizontally, the balancing means is configured for self-orienting the housing to a preset orientation with respect to the envelope by gravity. In this manner, the balancing means, coupled with a freedom of motion of the plurality of inductive modules around the envelope, may cause a positioning of the at least one of the plurality of inductive modules to be restored by equilibrium. In an embodiment, the balancing means may be fixed relative to said at least one of the plurality of inductive modules. In another embodiment, the balancing may be adjustable, in weight or in position, relative to said at least one of the plurality of inductive modules. In a particular embodiment, each of the plurality of inductive modules further comprises a balancing means. Additionally the plurality of inductive modules may comprise a common balancing means linking them together so that the orientation of the plurality of inductive modules is controlled in a joint manner. In yet another embodiment, the balancing means may be individually adjusted for each of the plurality of inductive modules and different orientations may be obtained, thereby increasing the modularity of the system.

It is to be noted that placing the balancing means such that the overall center of gravity of the inductive module is substantially close to a rotation axis of the inductive module may allow for an increased stability of the preset orientation in regards of environmental changes; placing the balancing means such that the overall center of gravity of the inductive module is substantially away from the rotation axis of the inductive module may allow for an increased precision in the preset orientation, According to a preferred embodiment, the functional unit is at least partially provided to an external surface of the housing, preferably the at least one light source is provided to the external surface of the housing.

In this way, illumination by the at least one light source is direct and the loss of emitted light is diminished. Preferably the at least one light source of the lighting unit is an LED light source. It is to be noted that a part of the functional unit different from the lighting unit may also be advantageously provided to the external surface of the housing to improve its functioning. According to an exemplary embodiment, the at least one light source comprises an OLED light source or a QLED light source, preferably an OLED panel light source. In this manner, one can obtain light emitted from the at least one light source with a high intensity, suitable for providing a desired visibility level in an outdoor or industrial environment, while having a substantially low power consumption, which is better suited to inductively powered systems. In an embodiment, there may be more than one light source per lighting unit of the corresponding inductive module. According to a preferred embodiment, the electrical power provided to the primary wire has a frequency above 20kHz.

In this way, the electrical power is provided through a signal above a frequency audible by a human being. According an exemplary embodiment, the secondary wire of the electromagnetic coupling means has less than 40 windings, preferably less than 30 windings, more preferably less than 20 windings, most preferably less than 10 windings. In this manner, the inductive module may operate at a substantially high frequency, preferably above a frequency audible by a human being. In an embodiment, the AC current circulating in the primary wire may have a frequency above 20kHz and the number of windings of the secondary wire around the magnetic core may be reduced in order to operate at a higher frequency corresponding to the frequency of the power in the primary wire. According to a preferred embodiment, the power supply is configured to provide an apparent power of the electrical power to the primary wire below 9W.

In this way, a lighting system with low power consumption may be realized. In an embodiment, the at least one light source comprises an OLED or a QLED light source which is adapted for being supplied with an amount of power below OW.

According to an exemplary embodiment, an inductive module of the plurality of inductive modules further includes a heat dissipation element. In this manner, heat dissipation by said inductive module may be better managed. In an embodiment, the heat dissipation element may serve as the balancing means due to its substantially large weight relative to a weight of the inductive module. According to a preferred embodiment, the envelope is suitable for arranging at least three inductive modules onto it, preferably for arranging at least four inductive modules onto it.

In this way, a functional modularity of the lighting system is increased. According to an exemplary embodiment, the magnetic core has a length longer than half its inner diameter, preferably longer than its inner diameter.

In this manner, the magnetic core may be designed to have an improved ratio of effective length with respect to effective area for inductive coupling purposes. According to a preferred embodiment, the housing comprises a plurality of protuberances protruding in the through-hole, said plurality of protuberances being configured for centering the magnetic core relative to the primary wire, In this way, efficiency for the inductive coupling may be improved.

According to an exemplary embodiment, the housing is a closed housing enclosing the electromagnetic coupling means.

In this manner, electrical components of the inductive module may be better protected against adverse environmental conditions. Preferably, the housing may satisfy an IP66 rating.

According to a preferred embodiment, a portion of the housing is orientable such that an orientation of at least part of the functional unit, preferably a main direction of illumination of the at least one light source can be altered.

In this way, the modularity of illumination of the lighting unit of the inductive module may be further improved. In an embodiment, the portion of the housing is made of a flexible material which can be deformed. In another embodiment, the portion of the housing may be orientable due to one or more articulations of the housing. Additionally, the at least one light source may be a flexible OLED panel which allows for a curved illumination light source. It is to be noted that a part of the functional unit different from the lighting unit may also be advantageously provided to the orientable portion of the housing to improve its functioning.

BRIEF DESCRIPTION OF THE FIGURES This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing a currently preferred embodiment. Like numbers refer to like features throughout the drawings. Figure 1 illustrates schematically an exemplary embodiment of a lighting system according to the invention; Figures 2A-2E illustrate schematically side views of external surface profiles of exemplary embodiments of a lighting system according to the invention; Figure 3A-3C show an inductive module with a lighting unit of exemplary embodiments of a lighting system according to the invention; Figures 4A-4C picture an overview, a close-up view, and an exploded view, respectively, of another exemplary embodiment of a lighting system according to the invention.

DESCRIPTION OF EMBODIMENTS

Figure 1 shows schematically an exemplary embodiment of a lighting system according to the present invention. The lighting system 100 comprises a power supply 110, and a plurality of inductive modules 120.

The lighting system 100 may be adapted for outdoor or industrial lighting. By outdoor lighting and industrial lighting, it is meant lighting adapted for roads, tunnels, industrial plants, stadiums, airports, harbors, rail stations, campuses, parks, cycle paths, pedestrian paths, or pedestrian zones for example, and outdoor and industrial lighting systems can be used notably for the lighting of an outdoor area, such as roads and residential areas in the public domain, private parking areas and access roads to private building infrastructures, warehouses, industry halls, construction sites, etc.

The power supply 110 is configured for generating electrical power provided to a primary wire 111 forming a current loop. In an embodiment, a frequency of a signal carrying the electrical power generated may be above 20kHz. The power generated through the primary wire 111 may be received by the plurality of inductive modules 120. In an embodiment, there may be two, preferably at least three, more preferably at least four inductive modules 120.

Each inductive module 120 of the plurality of inductive modules 120 may be configured in a similar manner or may be different from each other. The inductive module 120 comprises an electromagnetic coupling means including a magnetic core 121 and a secondary wire 122, and a functional unit. At least one inductive module 120 of the plurality of inductive modules comprises a functional unit corresponding to a lighting unit with at least one light source 123, preferably at least one light emitting diode.

Through the functional unit of the inductive module 120, different functions may be provided to the lighting system 100 which gains in modularity. There may be one function imparted per inductive module 120, or one inductive module 120 may comprise a plurality of functional units with different functions. For example, the functional unit may be any one of: a lighting unit, a display unit, an antenna unit, a sensing unit, a speaker unit, an air cleaning unit such as a UV light source, etc. The sensing unit may comprise a pollution sensor, a motion sensor, a humidity sensor, a light sensor, a temperature sensor, a visibility sensor, an image capturing sensor, a radar sensor, a sound sensor, a voice recorder, a CO2 sensor, a NOx sensor, a SOX sensor, a smoke sensor, a biological threat sensor, an infrared sensor, a thermal sensor. lt is also to be noted that the inductive module 120 with the lighting unit may also comprise additional functional units with different functions in addition to a lighting fanction.

For convenience reasons, the inductive modules 120 illustrated in Figure 1, Figures 3A-3C, and Figures 4A-4C may comprise a lighting unit with at least one light source 123; the skilled person will understand that embodiments of the application are not limited to inductive modules with the functional unit corresponding uniquely to the lighting unit but are equally applicable to other functional units embodiments.

The magnetic core 121 is configured for receiving the current loop of the primary wire

111. The secondary wire 122 is wound around a portion of the magnetic core 121 in a certain number of windings 122°, and is configured for coupling inductively to the primary wire 111. The secondary wire 122 of the electromagnetic coupling means may have less than 40 windings 122°, preferably less than 30 windings 122°, more preferably less than 20 windings 122°, most preferably less than 10 windings 122°.

The magnetic core 121 may be made of iron. Typically, the magnetic core 121 is cylindrically-shaped with a trough-hole as seen in the direction of the magnetic core main axis, via which the primary wire 111 is passing through. The magnetic core 121 may have a length longer than half its inner diameter, preferably longer than its inner diameter, for an improved coupling efficiency. The electromagnetic coupling means may allow supplying power to the functional unit. In an embodiment, there may be more than one functional unit being supplied in power by the electromagnetic coupling means.

In a preferred embodiment, the inductive module 120 comprises at least one low power light source 123 such as a LED light source, an OLED light source, or a QLED light source. In the embodiment of Figure 1, the at least one light source 123 is a COB LED filament. Correspondingly, the apparent power provided through the primary wire 111 may be below 9W.

To enhance the coupling efficiency between the primary wire 111 and the electromagnetic coupling means of the inductive module 120, the secondary wire 122 may be wound around the magnetic core 121 such that there is a match in the frequency with current frequency of the primary wire 111. In an embodiment, the frequency to be matched is about 22kHz and the secondary wire 122 is wound 10 times around the magnetic core 121. The inductive module 120 may also be provided with a heat dissipation element (not shown) in order to prevent the inductive module 120 from overheating.

Each of the plurality of inductive modules 120 further comprises a housing 125 configured for at least partially enclosing the electromagnetic coupling means. The housing 125 comprises an inner peripheral wall with an external surface delimiting the through-hole 125°. The through-hole 125° corresponds to a central hole of the magnetic core 121. To favor inductive coupling, the inner peripheral wall of the through-hole 125° may be made of a non-magnetic material, e.g. plastic, aluminum. In the embodiment of Figure 1, the housing 125 covers only a surface of the central hole of the magnetic core 121. In another embodiment, the housing 125 may be a closed housing enclosing the magnetic core 121. In yet another embodiment, the housing 125 may be a closed housing enclosing the inductive module 120.

In the embodiment of Figure 1, the inner peripheral wall of the through-hole 125” has a continuous external surface and defines a profile which is substantially circular. More detailed embodiments of external surface profiles will be seen with respect to Figures 2A-2E. More detailed embodiments of the housing 125 of the inductive module will be seen with respect to Figures 3A- 3C.

The power supply 110 further comprises an envelope 112 configured for receiving the primary wire 111 therein. To favor inductive coupling, a portion of the envelope 112 may be made of a non-magnetic material, ¢.g. plastic, aluminum. According to embodiments, the envelope 112 may be a flexible envelope, e.g. a sheath of the primary wire, or a rigid envelope, e.g. a tubing of the primary wire, or may comprise flexible portions and rigid portions. For convenience reasons, in the descriptions of Figure 1, Figures 2A-2E, Figures 3A-3C, and Figures 4A-4C, embodiments describe a rigid envelope 112; the skilled person will understand that these embodiments can also be implemented with other kinds of envelopes.

The rigid envelope 112 of Figure 1 is configured for extending through the through-hole 125° of the housing. After arranging the plurality of inductive modules 120 onto the rigid envelope 112 of the power supply, the rigid envelope 112 supports the plurality of inductive modules 120. The rigid envelope 112 may be shaped in one piece or may be assembled in a plurality of portions, assembled in four tube portions in the embodiment of Figure 1. In an embodiment, the rigid envelope 112 may comprise one or more tube portions categorized into curved portions and straight portions serving as building blocks for the rigid envelope 112. The one or more tube portions may be assembled together mechanically, e.g. bayonet mount, screwing mount, fitting mount, and/or chemically, e.g. glue. Additionally, the tube portion may comprise sections delimited by shoulders, said sections configured for restraining motions of the inductive module 120 along the tube portion of the rigid envelope 112 when the one or more tube portions are assembled together.

In an embodiment, the housing 125 may be slidable over the rigid envelope 112. Surfaces of the inner peripheral wall of the through-hole 125” and of the rigid envelope 112 in contact with each other may be provided with a given texture, or roughness, to improve or prevent a motion of the inductive module 120 along the rigid envelope 112. In an embodiment, the rigid envelope 112 may be provided with surfaces having different roughness to define smooth slidable sections and rough sections. Alternatively or additionally, the trough-hole 125’ may be configured for cooperating with the envelope 112 to position the inductive module 120 in a plurality of predetermined positions with respect to the envelope 112.

Additionally or alternatively, the lighting system 100 may further comprise a fixation means, preferably a clamping means, configured for fixing a position of at least one of the inductive modules 120 with respect to the envelope 112. It may advantageously provide to the lighting system 100 a means of preventing the inductive module 120 from moving along the envelope 112 and/or rotating around the envelope 112. The fixation means may be configured for getting fixed relative to the envelope 112 mechanically and/or chemically.

The fixation means may be fixed independently from the inductive module 120 and serves as a stop to the inductive module 120 or may fix directly the inductive module 120 to the envelope 112. According to different embodiments, the fixation means may be an element separate from the inductive module 120 and the envelope 112, may be comprised in the housing 125, or may be comprised in the envelope 112. An external surface of the rigid envelope 112 may define a profile similar or different to the profile of the inner peripheral wall of the through-hole 125°. In the embodiment of Figure 1, the IO external surface of the rigid envelope 112 is a continuous surface and defines a substantially circular profile, The external surface of the rigid envelope 112 and the external surface of the through-hole 125° may be complementary.

Due to the continuous profiles of the through-hole 125° and the rigid envelope 112, the inductive module 120 may rotate about the central hole of the magnetic core 121 around the rigid envelope 112. By gravity, the inductive module 120 may settle itself in position.

Additionally, each of the plurality of inductive modules 120 may further comprise a balancing means (not shown). The balancing means may be provided to the housing 125 of the inductive module, and, when orienting the power supply rigid envelope 112 substantially horizontally, the balancing means may be configured for self-orienting the inductive module 125 to a preset orientation with respect to the power supply rigid envelope 112 by gravity.

In an embodiment, the balancing means may be fixed relative to each of the plurality of inductive modules 120. In another embodiment, the balancing means may be adjustable, in weight or in position, relative to each of the plurality of inductive modules 120. Also, the plurality of inductive modules 120 may comprise a common balancing means linking them together so that the orientation of the plurality of inductive modules 120 is controlled in a joint manner.

Figures 2A-2E illustrate schematically side views of external surface profiles of through-holes and corresponding rigid envelopes according to the present invention.

The lighting system comprises a power supply (not shown), and a plurality of inductive modules (not shown). Each of the plurality of inductive modules comprises a housing 125 configured for at least partially enclosing an electromagnetic coupling means including a magnetic core (not shown). The housing 125 comprises an inner peripheral wall with an external surface delimiting the through-hole 125°. The through-hole 125" corresponds to a central hole of the magnetic core.

The power supply comprises a rigid envelope 112 configured for receiving a primary wire 111 therein.

The rigid envelope 112 is configured for extending through the through-hole 125° of the housing.

In an embodiment, the trough-hole 125’ may be configured for cooperating with the envelope 112 to position the inductive module 120 in a plurality of predetermined positions with respect to the envelope 112.

In the embodiment of Figure 2A, the housing 125 has an inner peripheral wall with an external surface delimiting the through-hole 125°. The external surface defines a profile including a firstedge 125”. The rigid envelope 112 has an external surface defining a profile including a second edge 112’ configured for cooperating with the first edge 125”. When arranging the housing 125 onto the rigid envelope 112, the housing 125 is arranged in a predetermined position with respect to the rigid envelope 112, as seen in a plane perpendicular to an axis of the through-hole 125°.

The housing 125 of the inductive module may be arranged at a predetermined position with respect to the rigid envelope 112 such that both first edge 125” and second edge 112’ coincides. By aligning the first edge 125” and the second edge 112’, rotation of the plurality of inductive modules around the rigid envelope 112 may be prevented and the orientation of the illumination of the plurality of inductive modules may be kept despite adverse environment conditions.

In the embodiment of Figure 2B, the external surface profile of the through-hole 125° describes a triangle, and the external surface profile of the rigid envelope 112 describes a corresponding triangle. This triangular profile allows the housing 125 of the inductive module to be oriented along three different orientations during installations in steps of 120°, thereby allowing modularity in the illumination of the outdoor lighting system. The adjustment of the orientation in steps may be achieved by a discrete rotation of the inductive module with respect to a main axis of the rigid envelope 112 prior to the arrangement of the inductive module onto the rigid envelope

112.

In the embodiment of Figure 2C, the external surface profile of the through-hole 125° describes an octagon, and the external surface profile of the rigid envelope 112 describes a corresponding octagon. This octagonal profile allows the housing 125 of the inductive module to be oriented along eight different orientations during installations in steps of 45°. The adjustment of the orientation in steps may be achieved by a discrete rotation of the inductive module with respect to a main axis of the rigid envelope 112 prior to the arrangement of the inductive module onto the rigid envelope 112.

In the embodiment of Figure 2D, the external surface profile of the through-hole 125” has a continuous tear-shaped surface defined by a first maximum lateral dimension d/. The external surface profile of the power rigid envelope 112 has a continuous surface describing a circle, and has a second maximum lateral dimension d2 smaller than the first maximum lateral dimension d/. The shape of the through-hole 125° may favor orientation of the housing 125 along a certain direction. In an alternative embodiment, the external surface profile of the through-hole 125 has a continuous surface describing a circle, and the external surface profile of the power supply rigid envelope 112 has a continuous tear-shaped surface.

In the embodiment of Figure 2E, both the external surface profile of the through-hole 125° and the external surface profile of the rigid envelope 112 describe a circle. The housing 125 comprises a plurality of protuberances 125” protruding in the through-hole 125°. The plurality of protuberances 125° is configured for centering the magnetic core relative to the primary wire 111. In the embodiment of Figure 2E, the plurality of protuberances 125” is dome-shaped and located at four points at regular intervals along the external surface profile of the through-hole 125°. The skilled person will understand that the plurality of protuberances 125” may adopt different shapes IO and numbers to fulfill its functions.

In the embodiments of Figures 2D and 2E, the inner peripheral wall is configured to be rotatable around the rigid envelope 112. In the embodiments of Figures 2A, 2B, 2C, and 2E, the external surface of the inner peripheral wall may be substantially complementary to the external surface of the rigid envelope 112. By complementary, it is meant a substantial match in shape and dimensions between the external surface of the inner peripheral wall and the external surface of the envelope 112 to minimize an empty space volume between both external surfaces.

Figures 3A-3C shows inductive modules with a lighting unit of exemplary embodiments of an outdoor lighting system according to the present invention. The inductive module 120 comprises an electromagnetic coupling means including a magnetic core (not shown) and a secondary wire {not shown), and a functional unit. In the embodiments of Figures 3A-3C, the functional unit corresponds to a lighting unit including at least one light source 123.

The inductive module 120 further comprises a housing 125 configured for at least partially enclosing the electromagnetic coupling means. The housing 125 comprises an inner peripheral wall 125b with an external surface delimiting the through-hole 125°. The through-hole 125° corresponds to a central hole of the magnetic core. The inner peripheral wall 125b may be configured to be rotatable around a rigid envelope (not shown). More particularly, in the embodiment of Figures 3A-3C, the inner peripheral wall 125b is substantially cylindrical and extends along the axis A of the through-hole 125°.

The housing 125 may be slidable over the rigid envelope. Surfaces of the inner peripheral wall 125b of the through-hole 125 and of the rigid envelope in contact with each other may be provided with a given texture, or roughness, to improve or prevent a motion of the inductive module 120 along the rigid envelope. In an embodiment, the rigid envelope may be provided with surfaces having different roughness to define smooth slidable sections and rough sections.

In the embodiment of Figures 3A-3C, the housing 125 is a closed housing enclosing the inductive module 120, preferably such that the housing 125 may satisfy an [P66 rating. The housing 125 may further have an outer peripheral wall 125a substantially surrounding the inner peripheral wall 125b. Preferably, the magnetic core may be located between the inner peripheral wall 125b and the outer peripheral wall 1254. The at least one light source 123 may comprise an OLED panel, said OLED panel being flexible. The outer peripheral wall 1254 may be provided with a support for the at least one light source 123. In the embodiment of Figures 3A-3C, the support is integrated with the outer peripheral wall 1254 and shaped as a wing with a base portion 125c and a wing portion 125d. The wing extends in a plane substantially parallel to the axis A of the through-hole 125°. The wing extends at least partially below the through-hole 125°. More particularly, the base portion 125c of the wind extends from an area in a horizontal plane extending through the through-hole 125’; and the wing portion 125d of the wing extends to an area vertically below the through-hole 125°. The base portion 125c of the wing comprises the through-hole 125°. The wing portion 125d of the wing is provided, on its convex surface serving as the support, with the at least one light source 123. In an embodiment, a portion of the housing 125, the wing portion 125d of the housing for example, is orientable such that a main direction of illumination of the at least one light source 123 can be altered. The portion of the housing 125 may be made of a flexible material which can be deformed. Alternatively or additionally, the portion of the housing 125 may be orientable due to one or more articulations of the housing 125. Further, a balancing means (not shown) may be provided to the housing 125 of the inductive module. In the embodiment of Figures 3A-3C, the balancing means may be provided within the base portion 125c of the wing, substantially close to a rotation axis A of the inductive module 120. In an embodiment, a heat dissipation element (not shown) may serve as the balancing means. In the embodiment of Figure 3A, the wing portion 125d is shaped as a virgule allowing an illumination in on main direction at an angle with respect to an horizontal level. In the embodiment of Figure 3B, the wing portion 125d has a substantially round profile allowing an even illumination over an angular arc of at least 180°. In the embodiment of Figure 3C, the wing portion 125d has a flattened egg profile allowing illumination over an angular arc of at least 180° but with a preferential illumination directly below the inductive module.

Figures 4A-4C pictures an overview, a close-up view, and an exploded view, respectively, of another exemplary embodiment of a lighting system according to the present invention. The lighting system 100 comprises a power supply (not shown), and a plurality of inductive modules

120. The lighting system 100 may be adapted for outdoor or industrial lighting. By outdoor lighting and industrial lighting, it is meant lighting adapted for roads, tunnels, industrial plants,

stadiums, airports, harbors, rail stations, campuses, parks, cycle paths, pedestrian paths, or pedestrian zones for example, and outdoor and industrial lighting systems can be used notably for the lighting of an outdoor area, such as roads and residential areas in the public domain, private parking areas and access roads to private building infrastructures, warehouses, industry halls, construction sites, etc.

The power supply is configured for generating electrical power provided to a primary wire 111 forming a current loop. In an embodiment, a frequency of a signal carrying the electrical power generated may be above 20kHz. The power generated through the primary wire 111 may be received by the plurality of inductive modules 120. In the embodiment of Fig.4A, there are two inductive modules 120 comprising a functional unit corresponding to a lighting unit with at least one light source 123.

Each inductive module 120 of the plurality of inductive modules may be configured in a similar manner or may be different from each other. The inductive module 120 comprises an electromagnetic coupling means including a magnetic core 121 and a secondary wire 122, and the functional unit. The magnetic core 121 is configured for receiving the current loop of the primary wire 111. The secondary wire 122 is wound around a portion of the magnetic core 121 in a certain number of windings, and is configured for coupling inductively to the primary wire 111. The secondary wire 122 of the electromagnetic coupling means may have less than forty windings, preferably less than thirty windings, more preferably less than twenty windings, most preferably less than ten windings.

The magnetic core 121 may be made of iron. Typically, the magnetic core 121 is cylindrically-shaped with a trough-hole as seen in the direction of the magnetic core main axis, via which the primary wire 111 is passing through. The magnetic core 121 may have a length longer than half its inner diameter, preferably longer than its inner diameter, for an improved coupling efficiency. The electromagnetic coupling means may allow to supply power to the functional unit, e.g. to the at least one light source 123 of the lighting unit. In an embodiment, there may be more than one functional unit, for example a plurality of light sources 123, being supplied in power by the electromagnetic coupling means for a given inductive module 120.

In a preferred embodiment, the functional unit of inductive module 120 corresponds to a lighting unit comprising at least one low power light source 123 such as a LED light source, an OLED light source, or a QLED light source. In the embodiment of Figs.4A-4C, the at least one light source 123 is an OLED panel. Correspondingly, the apparent power provided through the primary wire 111 may be below 9W.

To enhance the coupling efficiency between the primary wire 111 and the electromagnetic coupling means of the inductive module 120, the secondary wire 122 may be wound around the magnetic core 121 such that there is a match in the frequency with current frequency of the primary wire 111. In an embodiment, the frequency to be matched is about 22kHz and the secondary wire 122 is wound ten times around the magnetic core 121. The inductive module 120 may also be provided with a heat dissipation element 124 in order to prevent the inductive module 120 from overheating. In the embodiment of Fig.4A, the heat dissipation element 124 is configured for dissipating heat from a rectifier circuit (not shown) connected to the secondary wire 122. The heat dissipation element 124 is located on a portion of the housing 125 opposite to the at least one light source 123.

Each of the plurality of inductive modules 120 further comprises a housing 125 configured for at least partially enclosing the electromagnetic coupling means. The housing 125 comprises an inner peripheral wall with an external surface delimiting the through-hole 125°. The through-hole 125° corresponds to a central hole of the magnetic core 121. In an embodiment, the housing 125 may cover only a surface of the central hole of the magnetic core 121. In another embodiment, the housing 125 may be a closed housing enclosing the magnetic core 121. In the embodiment of Figs.4A-4B, the housing 125 is a closed housing enclosing the inductive module 120. In the embodiment of Fig. 4A, the inner peripheral wall of the through-hole 125’ has a continuous external surface and defines a profile which is substantially circular.

The power supply 110 further comprises an envelope 412 configured for receiving the primary wire 111 therein. In the embodiment of Fig.4A, the envelope 412 is a flexible envelope, e.g. a sheath of the primary wire. According to other embodiments, the envelope may be a rigid envelope, e.g. a tubing of the primary wire, or may comprise flexible portions and rigid portions.

In an embodiment, the housing 125 may be slidable over the flexible envelope 412. Surfaces of the inner peripheral wall of the through-hole 125° and of the flexible envelope 412 in contact with each other may be provided with a given texture, or roughness, to improve or prevent a motion of the inductive module 120 along the flexible envelope 412. In an embodiment, the flexible envelope 412 may be provided with surfaces having different roughness to define smooth slidable sections and rough sections.

Additionally or alternatively, the lighting system 100 may further comprise a fixation means, preferably a clamping means, configured for fixing a position of at least one of the inductive modules 120 with respect to the flexible envelope 412. It may advantageously provide to the lighting system 100 a means of preventing the inductive module 120 from moving along the flexible envelope 412 and/or rotating around the flexible envelope 412. The fixation means may be configured for getting fixed relative to the flexible envelope 412 mechanically and/or chemically. The fixation means may be fixed independently from the inductive module 120 and serves as a stop to the inductive module 120 or may fix directly the inductive module 120 to the flexible envelope 412. According to different embodiments, the fixation means may be an element separate from the inductive module 120 and the envelope 412, may be comprised in the housing 125, or may be comprised in the envelope 412.

Due to the continuous profile of the through-hole 125” and the relatively small diameter of the flexible envelope 112, the inductive module 120 may rotate about the central hole of the magnetic core 121 around the flexible envelope 112. By gravity, the inductive module 120 may settle itself in position. Additionally, each of the plurality of inductive modules 120 may further comprise a balancing means. The balancing means may be provided to the housing 125 of the inductive module, and, when orienting the power supply flexible envelope 412 substantially horizontally, the balancing means may be configured for self-orienting the inductive module 120 to a preset orientation with respect to the power supply flexible envelope 112 by gravity. In the embodiment of Fig.4A, the heat dissipation element 124 may serve as the balancing means. The balancing means may be located, when the inductive module 120 is settled in position, in the upper half of the inductive module 120, preferably below the through-hole 125°.

The inductive module 120 comprises the housing 125 configured for at least partially enclosing the electromagnetic coupling means. The housing 125 comprises an inner peripheral wall 125b with an external surface delimiting the through-hole 125’. The through-hole 125° corresponds to a central hole of the magnetic core 121.

In the embodiment of Figs.4A-4B, the housing 125 further has an outer peripheral wall 125a substantially surrounding the inner peripheral wall 125b, preferably such that the housing 125 may satisfy an IP66 rating. Preferably, the magnetic core 121 may be located between the inner peripheral wall 125b and the outer peripheral wall 125a. To favor inductive coupling, both the inner peripheral wall 125b and a corresponding portion of the envelope 412 are made of a non- magnetic material, e.g. plastic, aluminum.

In the embodiment of Figs. 4A-4C, the at least one light source 123 comprises an OLED panel, said OLED panel being flexible. The outer peripheral wall 125a may be provided with a support for the at least one light source 123. In the embodiment of Figs.4A-4C, the support is integrated with the outer peripheral wall 1254 and shaped as a wing with a base portion 125c and a wing portion 125d. The wing extends in a plane substantially parallel to the axis of the through- hole 125°. The wing extends at least partially below the through-hole 125°. More particularly, the wing portion 125d of the wing extends to an area vertically below the through-hole 125°.

The base portion 125c of the wing comprises the through-hole 125’. The wing portion 125d of the housing is provided, on its convex surface serving as the support, with the at least one light source 123. The at least one light source 123 may be provided to an external surface of the outer peripheral wall 125a. In the embodiment of Fig.4A-4C, the at least one light source 123 may be fixed to the outer peripheral wall 125a via a frame 123’ with a central transparent window, said frame 123’ being configured for cooperating with railings 123” of the outer peripheral wall 125a.

The railings 123” may be provided on one or more sides of the frame 123°, on all sides of the frame 123’ in the embodiment of Figures 4A-4C.In other embodiments, the at least one light source 1254 may be fixed via other fixation means, e.g. screws, glue, rivets, etc.

As pictured in Figure 4C, the housing 125 may be completed by a closing element 126.

The closing element 126 may be configured for completing the enclosure of the housing 125. In the embodiment of Figure 4C, the closing element 126 may be configured for completing a lateral side of the housing 125. The closing element 126 may comprise a through-hole portion 126b configured for cooperating with the inner peripheral wall 125b of the housing, and a plugging portion 126a configured for cooperating with the outer peripheral wall 125a of the housing. The closing element 126 and the housing 125 may be retained together via a housing fixation means 126’, preferably a snap-fit fixation.

In an embodiment, a portion of the housing 125, the wing portion 125d for example, may be orientable such that a main direction of illumination of the at least one light source 123 can be altered. The portion of the housing 125 may be made of a flexible material which can be deformed.

Alternatively or additionally, the portion of the housing 125 may be orientable due to one or more articulations of the housing 125. Whilst the principles of the invention have been set out above in connection with specific embodiments, it is to be understood that this description is merely made by way of example and not as a limitation of the scope of protection which is determined by the appended claims.

Claims

Conclusions

A light system, preferably for outdoor lighting, comprising: - a power source (110) adapted to generate electrical power supplied to a primary wire (111) forming a current loop; - a plurality of inductive modules (120) adapted to receive power from the power source (110), each of the plurality of inductive modules (120) comprising: - an electromagnetic coupling means comprising: - a magnetic core (121) adapted to receive the current loop of the primary wire (111), - a secondary wire (122) wrapped around a portion of the magnetic core (121) and adapted for inductive coupling to the primary wire (111 ); - a functional unit connected to the secondary wire (122); - wherein the electromagnetic coupling means is adapted to supply power to the functional unit; - wherein at least one inductive module of the plurality of inductive modules comprises a functional unit, which corresponds to an Hcht unit (123) with at least one light source, preferably at least one Hcht-emitting diode; characterized in that - each of the plurality of inductive modules (120) further comprises a housing (125) adapted to at least partially enclose the electromagnetic coupling means, the housing (125) having a through hole (1257) which corresponds to a central hole of the magnetic core (121); and - the light system further comprises a sheath (112) adapted to receive the primary wire (111) therein, the sheath (112) being adapted to extend through the through hole (1257) of the housing, and is configured to support the plurality of inductive modules (120) when the plurality of inductive modules (120) are mounted on the enclosure (112).

2. The light system according to claim 1, wherein the envelope is a rigid envelope.

The light system of claim 1 or 2, wherein the through hole is adapted to cooperate with the cover to position the inductive module in a plurality of predetermined positions relative to the cover.

The light system of any preceding claim, wherein the housing comprises an inner circumferential wall and an outer circumferential wall substantially surrounding the inner circumferential wall.

The outdoor light system of the preceding claim, wherein the inner peripheral wall of the housing defines the through hole, the inner peripheral wall being adapted to be rotatable about the housing.

The light system of any one of claims 1-4, wherein the housing has an inner peripheral wall with an outer surface defining the through hole, the outer surface defining a profile including a first edge: wherein the housing has a second outer surface defining a profile including a second edge adapted to cooperate with the first edge; wherein, during the mounting of the housing on the housing, the housing is arranged at a predetermined position relative to the housing as viewed from a plane perpendicular to an axis of the through hole.

The light system of any one of claims 4-6, wherein the inner peripheral wall has an outer surface that is substantially complementary to an outer surface of the enclosure.

The light system of any one of claims 4-7, wherein the inner peripheral wall is substantially cylindrical.

The light system according to any one of claims 4-8, wherein the outer circumferential wall is provided with a support, which is arranged for supporting at least partly the functional unit, preferably for supporting the at least one light source.

The light system of the preceding claim, wherein the support is wing-shaped, preferably integrated with the outer circumferential wall.

The light system of the preceding claim, wherein the wing extends in a plane substantially parallel to an axis of the through hole.

The light system of claim 10 or 11, wherein the wing extends at least partially below the through hole.

The light system of any one of claims 10-12, wherein the wing extends from a zone in a horizontal plane passing through the through hole to a zone vertically below the through hole.

The light system of any preceding claim, wherein the housing is slideable over the cover.

The light system according to any one of the preceding claims, further comprising a fixation means, preferably a clamping means, which is adapted to fix a position of at least one of the inductive modules relative to the casing.

The light system of any preceding claim, wherein the enclosure comprises one or more tube members.

The light system of any preceding claim, wherein at least one of the plurality of inductive modules further comprises a balancing means, the balancing means being provided on the housing of the inductive module; wherein, while orienting the casing substantially horizontally, the balancing means is adapted to self-orient the casing to a preset orientation relative to the casing by gravity.

The light system according to any one of the preceding claims, wherein the functional unit is provided at least partially on an outer surface of the housing, preferably the at least one light source is provided on the outer surface of the housing.

The light system according to any one of the preceding claims, wherein the at least one light source comprises an OLED light source or a QLED light source, preferably an OLED panel light source.

The light system of any preceding claim, wherein the electrical power provided to the primary wire has a frequency above 20 kHz.

The light system of any preceding claim, wherein the secondary wire of the electromagnetic coupling means has less than 40 turns, preferably less than 30 turns, even more preferably less than 20 turns, most preferably less than 10 turns.

The light system of any preceding claim, wherein the power source is configured to provide an apparent power of the electrical power to the primary wire below the OW.

23. The lighting system of any preceding claim, wherein at least one inductive module of the plurality of inductive modules further comprises a heat dissipation element,

The light system according to any one of the preceding claims, wherein the casing is suitable for mounting at least three inductive modules thereon, preferably for mounting at least four inductive modules thereon.

The light system according to any one of the preceding claims, wherein the magnetic core has a length longer than half its inner diameter, preferably longer than its inner diameter.

The light system of any preceding claim, wherein the housing includes a plurality of protrusions projecting into the through hole, the plurality of protrusions being adapted to center the magnetic core relative to the primary wire relatively.

The light system of any preceding claim, wherein the housing is a closed housing enclosing the electromagnetic coupling means.

The light system according to any preceding claim, wherein a portion of the housing is orientable so that an orientation of at least a portion of the functional unit, preferably a principal direction of illumination of the at least one light source, can be adjusted.