WO2021079311A1 - Dispositif d'éclairage doté d'un système de protection contre les surtensions - Google Patents

Dispositif d'éclairage doté d'un système de protection contre les surtensions Download PDF

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Publication number
WO2021079311A1
WO2021079311A1 PCT/IB2020/059933 IB2020059933W WO2021079311A1 WO 2021079311 A1 WO2021079311 A1 WO 2021079311A1 IB 2020059933 W IB2020059933 W IB 2020059933W WO 2021079311 A1 WO2021079311 A1 WO 2021079311A1
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WO
WIPO (PCT)
Prior art keywords
plate
face
lighting device
led lighting
led
Prior art date
Application number
PCT/IB2020/059933
Other languages
English (en)
Inventor
Matteo CASALINO
Enrico PONS
Pietro COLELLA
Riccardo TOMMASINI
Original Assignee
Politecnico Di Torino
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Politecnico Di Torino filed Critical Politecnico Di Torino
Publication of WO2021079311A1 publication Critical patent/WO2021079311A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/10—Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a LED lighting device equipped with an overvoltage protection system according to the preamble of claim 1; in particular, the present invention falls within the field of LED lighting devices for street lighting applications in urban or suburban environments.
  • the LED lighting devices known in the art are typically affected by high overvoltage sensitivity; in particular, in the street lighting field, this characteristic is particularly problematical, since such devices are often subject to strong atmospheric overvoltages. As a consequence, the average life of LED devices is considerably reduced, resulting in increased costs and complexity incurred for maintaining street lighting systems based on such devices. For this reason, it is necessary to resort to protection methods and systems capable of insulating and protecting the LED device also from strong atmospheric overvoltages.
  • the LED lighting device can be protected by directly inserting a voltage discharger between the active parts of the LED lighting device and the protection conductor (i.e. in common mode configuration).
  • this protection is achieved by connecting, in parallel with the LED device, a plurality of dischargers and capacitors; such a solution requires the presence of a grounding terminal, and therefore can only be used in Class I LED devices.
  • the protection system is realized by using, in a suitable configuration, zinc-oxide varistors, overvoltage suppressor diodes and inductors; in this case as well, the use of the grounding terminal limits the use of the protection system to Class I LED devices.
  • overvoltage protection of a Class II LED lighting device can be accomplished by using a capacitive protection impedance disposed between the negative supply of the LED module and the metallic enclosure (also defined as containment enclosure in the present description) of the LED lighting device; in addition, further protection can be attained by reinforcing the insulation between the circuit of the LED device and the accessible internal (i.e. the heatsink) and external (i.e. the external containment enclosure of the lighting device) metallic parts.
  • Such solutions have many drawbacks. For example, the insertion of a capacitive impedance in a Class II LED device often requires the execution of a number of high-precision soldering steps; therefore, installing the LED lighting body into the containment enclosure turns out to be a complex and costly task.
  • the LED lighting device of the present invention comprises a first plate of dielectric material; said first plate may be substantially flat and may comprise a first face and a second face.
  • the dielectric material may be copper-plated vetronite or, more in general, fiberglass; the first plate may comprise an electric circuit comprising, for example, a plurality of conductive tracks etched on the dielectric material.
  • Said electric circuit may comprise an AC/DC converter (also referred to as power supply unit in the present description) and a plurality of protection elements.
  • the first plate may also comprise, on the first face thereof, one or more LEDs; said one or more LEDs may be connected, usually in series, into a single module (also referred to as LED module in the present description) by means of, for example, the conductive tracks of the electric circuit etched on the dielectric material of the first plate.
  • a LED Light Emitting Diode
  • a LED, or a LED module is an electronic component widely used in the lighting technology for making lighting devices; a LED, or a LED module, is usually powered by direct electric current or voltage through a positive current or voltage input (also referred to as positive pole in the present description) and a negative current or voltage input (also referred to as negative pole in the present description).
  • the LED lighting device of the present invention further comprises a second plate of electrically conductive material (e.g. aluminium), used as a heat sink for dissipating the heat produced by the electric circuit and the LEDs comprised in the first plate of dielectric material.
  • Said second plate may be substantially flat and may comprise a first face and a second face; in order to promote the dissipation of the heat produced by the first plate, the second plate of electrically conductive material faces towards the first plate of dielectric material so as not to affect the light emission of the LEDs.
  • the first face of the second plate of electrically conductive material may face towards the second face of the first plate of dielectric material; in particular, the first face of the second plate of conductive material may overlap, being preferably in direct contact therewith, the second face of the first plate of dielectric material.
  • the second plate of electrically conductive material comprises an electric connection to the negative pole of one LED or of the LED module.
  • the LED lighting device of the present invention further comprises a third plate of dielectric material; said third plate may be substantially flat and may comprise a first face and a second face.
  • the first face of the third plate of dielectric material may face towards the second face of the second plate of electrically conductive material.
  • the first face of the third plate of dielectric material may overlap, being preferably in direct contact therewith, the second face of the second plate of electrically conductive material.
  • the first, second and third plates are mutually overlapping (i.e. the second plate of electrically conductive material is interposed between the first and third plates).
  • the first plate and the third plate may be made of the same type of dielectric material; alternatively, the first plate may be made of a first dielectric material, and the third plate may be made of a second dielectric material.
  • the above-described LED lighting device may be comprised in a lighting apparatus for outdoor use (e.g. a street lighting apparatus).
  • Said lighting apparatus for outdoor use may comprise a containment enclosure made of metallic material, a support made of metallic material and adapted to support the containment enclosure at a predetermined height, and a LED lighting device as previously described herein.
  • the LED lighting device may be arranged within the containment enclosure so that the second face of the third plate of dielectric material faces towards a substantially flat portion of the containment enclosure; preferably, the second face of the third plate may be directly in contact with the surface of the containment enclosure.
  • the support and the containment enclosure may be configured to ensure electric continuity between themselves.
  • the present invention provides a LED lighting device incorporating the features set out in the appended claims, which are an integral part of the present description. Further objects, features and advantages of the present invention will become apparent in the light of the following detailed description and of the annexed drawings, provided merely by way of non-limiting example, wherein:
  • FIG. 1 schematically shows a LED lighting device with a system capacitance (Cs);
  • FIG. 2 schematically shows a LED lighting device according to the present invention
  • FIG. 3 schematically shows the electric circuit of a LED lighting device according to the present invention
  • FIG. 4 schematically shows an exploded view of a LED lighting device according to the present invention.
  • reference numeral 100 designates as a whole a LED lighting device comprising a power supply unit 103, one or more light emitting diodes 105a, 105b and 105c electrically connected in series (also referred to as LED module 105a, 105b and 105c in the present description), and a system capacitance (Cs) 104.
  • said system capacitance (Cs) 104 may be realized by means of a capacitive impedance electrically connected to the negative pole of the LED module 105a, 105b, 105c and to the containment enclosure 101 of the lighting device. Said containment enclosure
  • the containment enclosure 101 is usually a hollow body internally comprising a housing, consisting of a substantially flat surface, for the LED device.
  • the containment enclosure 101 may comprise a support 102; the support 102 and the containment enclosure 101 may be configured in such a way as to ensure electric continuity between themselves.
  • the containment enclosure 101 may be installed on the support 102 in a manner such that the metallic parts of the support 102 will be directly in contact with the metallic parts of the containment enclosure; alternatively, the support 102 and the containment enclosure 101 may be inseparable and made as a one metallic body.
  • Said support 102 may also be installed directly in contact with the ground or, alternatively, may comprise a grounding terminal 106; in both cases, the support
  • this capacitive protection impedance will behave like an open circuit; in this case, the presence of the capacitive impedance will not affect by any means the normal operation of the power supply unit 103 and of the LED module 105a, 105b and 105c.
  • the impedance will decrease and will allow the lightning current to flow towards the external containment enclosure 101 of the lighting device 100 and then towards the support 102 that is at the electric potential of the ground; in this manner, the power supply unit 103 and the LED module 105a, 105b, 105c will be protected against the atmospheric overvoltage.
  • reference numeral 200 schematically designates a LED lighting device according to one aspect of the present invention.
  • the LED lighting device 200 comprises a substantially flat first plate 201 of dielectric material, in turn comprising an electric circuit 204 and a LED module 105a, 105b, 105c.
  • the LED module 105a, 105b, 105c is so arranged as to emit light in a predefined direction; to this end, the LED module 105a, 105b, 105c is located on the surface of one of the two faces of the first plate.
  • the LED lighting device 200 further comprises a substantially flat second plate 202 of electrically conductive material (e.g. aluminium).
  • the main function of the second plate 202 is to dissipate the heat produced by the electric circuit 204 and by the LED module 105a, 105b, 105c.
  • the second plate 202 is disposed substantially parallel to that face of the first plate which does not carry the LED module 105a, 105b, 105c; in order to maximize heat dissipation, the second layer 202 of electrically conductive material may overlap the first layer 201, being preferably in direct contact therewith.
  • the LED lighting device 200 may further comprise a containment enclosure 101 and a support 102.
  • said support 102 may be installed in direct contact with the ground or, alternatively, may comprise a grounding terminal 106; in both cases, the support 102 will be at the electric potential of the ground.
  • the containment enclosure 101 and the support 102 are usually made of metallic materials characterized by high electric conductivity, and are configured to ensure electric continuity between themselves.
  • the basic idea of the present invention is to generate a system capacitance (C s ) for the LED lighting device 200 without the use of any additional electronic devices and without the need for high-precision soldering steps during the installation process.
  • the second plate of electrically conductive material is configured in such a way as to behave, in combination with a portion of the containment enclosure 101, like a capacitor with parallel flat faces.
  • the second plate 202 is electrically connected to the negative pole of the LED module 105a, 105b, 105c.
  • the LED lighting device 200 comprises a substantially flat third plate 203 of dielectric material. In this way, when the LED lighting device 200 is positioned in the housing of the containment enclosure 101, said third plate 203 is configured to face towards the second layer 202 of electrically conductive material, thus being interposed between the second layer 202 and the containment enclosure 101.
  • the second plate of electrically conductive material 202, the third plate of dielectric material 203 and the containment enclosure 101 form a capacitor (also referred to as composite capacitor in the present description) with substantially flat and substantially parallel faces, characterized by a system capacitance (C s ), operating in a way similar to above-described protection impedance.
  • C s system capacitance
  • the composite capacitor will allow the lightning current to flow towards the external containment enclosure 101 of the lighting device 100 and then towards the support 102 that is at the electric potential of the ground; in this manner, the power supply unit 103 and the LED module 105a, 105b, 105c will be protected against the atmospheric overvoltage.
  • the system capacitance (C s ) of the composite capacitor must be assessed appropriately. This operation can be carried out in accordance with techniques known in the art, by suitably adjusting at least one of the following parameters:
  • the dielectric material of the third plate 203 may be, for example, any one of the following:
  • thermally conductive insulating silicone e.g. Sil-Pad®
  • polyester film e.g. BoPET (biaxially-oriented polyethylene terephthalate,
  • the circuit 204 which is comprised in the first plate 201 of dielectric material, may comprise an AC/DC converter 103 (also referred to as direct current or voltage power supply unit or, more simply, power supply unit) comprising a phase input 301, a neutral input 302, a positive direct voltage output 303 (i.e. the positive pole of the DC circuit) and a negative direct voltage output 304 (i.e. the negative pole of the DC circuit).
  • said AC/DC converter may be functionally connected to the circuit 204 via electric connections (e.g. electric wires), so that it can be located at any distance from the first plate 201.
  • the outputs 303 and 304 of the power supply unit 103 are electrically connected to the positive pole and the negative pole of a LED 105a or a LED module 105a, 105b, 105c.
  • the electric circuit 204 comprises also three varistors 305, 306, 307; as is known, a varistor is an electronic component for overvoltage protection which is comparable to a variable-resistance resistor.
  • the resistance value of a varistor can be determined so as to decrease rapidly when the voltage across its terminals exceeds a given threshold value.
  • the varistor 305 protects the power supply unit on the input side from overvoltages occurring across the phase input 301 and the neutral input; the varistor 306 protects the power supply unit on the input side from overvoltages occurring across the neutral input 302 and the negative pole of the DC system (for example, the varistor 306 may be connected to the second plate 202).
  • the varistor 307 protects the power supply unit on the output side and the LED module 105a, 105b, 105c from induced overvoltages across the positive direct voltage output 303 of the power supply unit 103 (or the positive pole of the LED module 105a, 105b, 105c) and the negative pole of the DC system; to this end, the varistor 307 may be connected to the positive direct voltage output 303 of the power supply unit 103 and, even indirectly, to the grounding terminal (for example, the varistor 306 may be connected to the second plate 202).
  • Figure 4 shows an exploded view of an embodiment of the present invention.
  • the first plate 201 comprises a first face 201a, in turn comprising an electric circuit 204 and a LED module 105a, 105b, 105c.
  • the second plate 202 of electrically conductive material comprises a first face 202a and a second face 202b; the first face 202a faces the second face 201b of the first plate 201, overlapping it or being directly in contact with it.
  • the second plate of electrically conductive material is so arranged as not to affect the light emission of the LED module 105a, 105b, 105c.
  • the LED lighting device 200 comprises a third plate of dielectric material interposed between the metallic plate 202 and the containment enclosure 101.
  • the first plate 201, the second plate 202, the third plate 203 and the area 101a of the containment enclosure 101 facing towards the third plate 203 may be substantially flat.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

La présente invention porte sur un dispositif d'éclairage à DEL (200) comprenant : une première plaque de matériau diélectrique (201) comprenant une première face (201a) et une seconde face (201b), ladite première plaque (201) comprenant au moins un circuit électrique (300) et au moins un module de DEL (105a, 105b, 105c) situé sur la première face (201a) de la première plaque (201), ledit au moins un module de LED (105a, 105b, 105c) comprenant un pôle positif et un pôle négatif ; une seconde plaque de matériau électro-conducteur (202) comprenant une première face (202a) et une seconde face (202b), ladite seconde plaque (202) étant électriquement connectée au pôle négatif dudit au moins un module de DEL (105a, 105b, 105c), ladite première face (202a) de la seconde plaque (202) étant orientée, au moins partiellement, vers la seconde face (201b) de la première plaque (201). La particularité dudit dispositif d'éclairage à LED (200) réside dans le fait qu'il comprend une troisième plaque (203) en matériau diélectrique orientée, au moins en partie, vers la seconde face (202b) de la deuxième plaque (202). La présente invention concerne en outre un appareil d'éclairage à usage extérieur, comprenant une enveloppe de protection (101) en matériau métallique, un support (102) en matériau métallique et conçu pour supporter l'enveloppe de protection (101) à une hauteur prédéterminée, et un dispositif d'éclairage à DEL (200).
PCT/IB2020/059933 2019-10-24 2020-10-22 Dispositif d'éclairage doté d'un système de protection contre les surtensions WO2021079311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000019755A IT201900019755A1 (it) 2019-10-24 2019-10-24 Dispositivo di illuminazione a led con sistema di protezione dalle sovratensioni
IT102019000019755 2019-10-24

Publications (1)

Publication Number Publication Date
WO2021079311A1 true WO2021079311A1 (fr) 2021-04-29

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PCT/IB2020/059933 WO2021079311A1 (fr) 2019-10-24 2020-10-22 Dispositif d'éclairage doté d'un système de protection contre les surtensions

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IT (1) IT201900019755A1 (fr)
WO (1) WO2021079311A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012143871A1 (fr) * 2011-04-20 2012-10-26 Koninklijke Philips Electronics N.V. Dispositif de protection contre les surtensions
WO2014029772A1 (fr) * 2012-08-20 2014-02-27 Schreder Procédé de, et système pour isolation de luminaires à del contre des surtensions électriques

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201636674U (zh) 2009-06-10 2010-11-17 黄爱国 防雷led路灯
CN204464990U (zh) 2015-03-19 2015-07-08 苏州松田微电子有限公司 防雷击led驱动电源电路

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012143871A1 (fr) * 2011-04-20 2012-10-26 Koninklijke Philips Electronics N.V. Dispositif de protection contre les surtensions
WO2014029772A1 (fr) * 2012-08-20 2014-02-27 Schreder Procédé de, et système pour isolation de luminaires à del contre des surtensions électriques

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Publication number Publication date
IT201900019755A1 (it) 2021-04-24

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