EP2930416A1

EP2930416A1 - LED fixture housing

Info

Publication number: EP2930416A1
Application number: EP14000815.2A
Authority: EP
Inventors: Andrii Bodnar
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-07
Filing date: 2014-03-07
Publication date: 2015-10-14

Abstract

Fixture (1) with LEDS (2) contains an elongated housing (3), and can be equipped with channel (4), which consists of a power supply unit (5), electrical connections with placed LEDs (2). The housing (3) of the fixture 1 is equipped with reflectors (6) that are, at the same time, radiators directed diagonally downwards from central part of the housing (3) of the fixture (1). The reflectors (6) form a reflector system for light from LEDs (2) and are symmetrical or asymmetrical relative to longitudinal symmetry axis of the fixture (1).

Description

Subject of the invention is a LED fixture housing.
There are known lamps intended for general illumination of premises with large area, such as production halls, shopping centers or warehouses.
Lately, from the economic viewpoint as well as for environmental protection, there are used fixtures with LEDs as a light source.
Moreover, LEDs have greater endurance compared to conventional fluorescent lamps and can be operated from 3 to 5 times longer than fluorescent lamps.
A fixture for a linear fluorescent lamp consists of a housing containing elements inside, which are used to adjust position of the fixture itself and reflector, as well as a power supply, which is located over fluorescent lamp. Since fluorescent lamp emits light in all directions, radiating it around longitudinal axis of the tube, one must equip the fixture with reflectors that would direct the light to a surface to be lighted. Typically, the reflectors are made of thin metal plate, and may be of various shapes. Their exclusive task is a corresponding redirection of light rays from fluorescent lamp. Fixtures of this type do not overheat. To cool fluorescent lamp a glass tube surface of a fluorescent lamp itself is enough.
LED light sources, as semiconductor elements, require cooling for their proper operation. We know LED fixtures that consist of housing with a power supply inside, as well as elements that are used to adjust position of fixture, secondary lenses for LEDs that direct light stream by its concentration.
From the patent document No. US 6880952 we know compact, energy-efficient linear light sources that combine advantages of diode lamps with brightness of conventional lighting. Such source contains:

elongated mounting framework with opposite surfaces (first and second one) and heat diffuser along this framework;
at least one right plate with PCB;
at least one left plate with PCB separated from the aforementioned right plate;
LEDs fixed in openings along the heat diffuser, while, each diode has a cathode connected to at least one right plate with PCB and at least one left plate with PCB, and each of the diodes has its anode connected to at least one right plate with PCB and at least one left plate with PCB;
bracket framework connected to the second surface of the mounting base, which has a first length and made of a heat conductive material and contains internal channels along the first length;
at least two console elements connected to the first surface of the mounting base so that the diodes are placed between them, each of at least two bracket elements contains a mirror surface adjacent to the diodes in order to direct the light stream;
window attached to at least two bracket elements, while at least two brackets have a first segment for placing mounting base, at least two bracket elements and, at least part of the window, and
at least two end caps for connecting the first and second end of at least two brackets.

From the Patent description No. WO 2005024291 we know a fixture with light source of several LEDs. It has a housing adapted to illuminate premises; this housing has opened side part that allows obtaining a concentrated light beam. The fixture has elements for controlling a light source and its mounting, and its characteristic feature is a housing that serves to dissipate heat generated by LEDs, while the light source and the said elements can be integrated.
From the patent description No. US 2010216536 we know lighting devices that contain LED microsystems and heat dissipation system, which consists of a fan for air ventilation, thereby the LED microsystems are cooled by dissipating of heat generated by LEDs to air through the fan.
From the patent specification No. WO 2010052538 we know LED devices for use particularly in tunnels. The devices consist of a main housing with cooling plates. The diodes are attached to main housing and powered by an external power source through power lines. They contain, in addition, if necessary, reflectors placed on light emitting diodes and a cover - this provides a tight inner space that is connected with at least one slot for extension.
From the patent description No. US 7244058 we know a mounting lamp for a vehicle that has a heat diffuser of at least one flange, plate with circuit board functionally connected to inner surface of the heat diffuser, this plate also has a power supply system, and, at least one unit which emits electric light, bonded to the heat diffuser. The connection for compound filling has a PCB plate inserted with appropriate electrical connections. The lamp has lenses connected to a heat diffuser.
Known designs of diode lamps consist of housing, LEDs and power supply. During operation the diodes generate energy not only in a form of light, but also, in a form of heat that in case of their application in lamps is a disadvantage. Therefore, there is a need to design lamps to dissipate heat as well as possible. There are solutions that provide heat dissipation through housing mainly by convection. That is, the larger is surface area of the housing, the more heat can be dissipated. Since, in most cases, power supply is installed in housing, it imposes significant restrictions. First of all, a maximum temperature that does not cause any malfunctions or problems in a power supply unit is 50-70 °C. This significantly limits power of diodes that can be used in fixtures. To improve the ability of convection there is used an increased surface area housing, as shown in figure pos. 1 or use of side ribs on the housing as shown in pos. 2. In the figure pos. 1 and pos. 2 there are schematically indicated directions of the main heat dissipation during operation of LEDs.
An essential feature of the fixtures is also a corresponding light redirection that is solved in case of using LEDs as a light source, mainly through use of optical systems that are placed under diodes and perform function of light beam concentrating.
The aim of the invention is to provide such a solution of a LED fixture housing that provides redirection of a light beam and heat dissipation to external environment through convection and radiation at the same time.
The LED fixture according to the invention contains an elongated body, and can be provided with a channel with a power supply unit, electrical connections with LEDs placed in series. The fixture housing is equipped with reflectors with radiator functions and which are directed diagonally downward from central part of the fixture.
It is useful when reflectors form a reflector system for LED light and are symmetric or asymmetric with respect to longitudinal symmetry axis of a fixture.
It is useful, too, when a fixture housing with reflectors and channel, where power supply is located, form a single element.
It is also useful when a fixture housing with reflectors and housing element together with a channel that has a power supply are connected to each other.
Is also useful, when a channel that is used for an elongated housing that has a power supply, can be closed by a cover.
It is also useful when housing with reflectors and cover are made of a metal alloy.
Subject of the invention is presented in execution examples in the figures, fig. 1 illustrates a LED fixture in a schematic cross-sectional view wherein the reflectors comprise a single element with the housing, fig. 2 schematically illustrates a fixture in cross-section, wherein the reflectors comprise a separate element joined to the housing, fig. 3 shows a cross-sectional profile of the fixture together with design in an example, where reflectors take a shape that looks like a cylinder sectors, and the housing has two side, right vertical walls, fig. 4 shows a cross-sectional profile of the fixture in the exemplary execution from the fig. 3, fig. 5 shows a cross-sectional profile of the fixture in the exemplary execution, where reflectors take a shape that looks like a cylinder sectors without vertical walls of the housing, and fig. 6 shows a cross-sectional profile of the fixture in the exemplary execution, where reflectors are quite strongly bent downward.
Fixture 1 with LEDs 2, as shown schematically in fig. 1, has a housing 3 in a form of a rectangular parallelepiped, its channel 4 contains power supply 5. The side vertical walls of the housing 3 are elongated downwards beyond the channel 4, and further are bent outward angularly, reflectors 6 are placed symmetrically with respect to vertical axis of the cross section. Outside of the housing 3, under the channel 4 there are arranged LEDs 2. Heat from the working LEDs 2 is transferred to the housing 3 and reflectors 6, and then is transferred into environment by convection and radiation. Example of this fixture version is shown in fig. 3, where reflectors 6 comprise single element with housing 3. The reflectors 6 take a form that is similar to a cylinder sector and the housing 3 has two side, right vertical walls with cover 7 on top. The cover 7 contains sockets, and in vertical walls of the housing 3 there are projections that correspond to the sockets of the cover 7 that serve to connect the cover 7 to the housing 3 by means of clips. Vertical walls of the housing 3 together with the cover 7 create channel 4, which houses power supply 5. Fig. 3 schematically represents main directions of heat dissipation from working LEDs 2. Fig. 4 shows a cross-sectional profile of the housing 3 of the fixture 1 from the described above execution example without the cover 7 and equipment elements. Of course, another execution example can use a housing profile 3, which cross section is shown in fig. 6.
Fig. 5 represents a sectional view of the housing 3 containing only reflectors 6 and middle part of the housing 3, on which LEDs 2 are mounted at the bottom, and the top surface has a power unit 5 installed.
Fig. 2 schematically illustrates fixture 1 with LEDs 2 wherein reflectors 6 comprise a single element, mechanically connected to housing 3 of the fixture 1. In this execution example the housing 3 is open at top. Heat dissipation to environment from operating LEDs 2 occurs mainly through the reflectors 6.
The housing 3 with the reflectors 6 and the cover 7 in all the examples described above is made of a metal alloy: by casting or extrusion, or sheet bending
Nature of the invention is certainly not limited to the execution examples with possibility of its various modifications within patent restraints without deviation from essence of the invention.

Claims

LED fixture comprising an elongated housing may be equipped with a channel which has a power supply unit electrically connected to LEDs placed in series, and is characterized by a structure, where housing (3), of fixture (1) is provided with reflectors (6), which are also radiators directed diagonally downward from central part of the housing (3) of the fixture (1).
Fixture, according to the restraint 1, is characterized by structure, where reflectors (6) compose a reflector system for light from LEDs (2) and can be symmetrical ones relative to longitudinal symmetry axis of fixture (1).
Fixture, according to the restraint 1, is characterized by a structure, where reflectors (6) make a reflector system for light from LEDs (2) and may be asymmetrical relative to longitudinal symmetry axis of fixture (1).
Fixture according to the restraint 1 is characterized by a structure, where housing (3) of fixture (1) with reflectors (6) together with channel (4), which includes a power supply (5), form a single element.
Fixture, according to the restraint 1, is characterized by a structure, where housing (3) of fixture (1) with reflectors (6) and housing element (3) with channel (4), which has power unit (5) are interconnected.
Fixture, according to the restraint 1, is characterized by a structure, where channel (4), which is part of elongated housing (3), which has power supply unit (5) is closed with cover (7).
Fixture, according to the restraint 1, is characterized by a structure, where channel (4), which is part of elongated housing (3), which has a power supply unit (5), is open.
Fixture, according to the restraint 1 or 4 or 5, is characterized by a structure, where housing (3) with reflectors (6) is made of a metal alloy as well as other materials.
Fixture, according to the restraint 1 or 4 or 5, is characterized by a structure, where housing (3) and reflectors (6) are made of non-steel materials.