WO2010043741A1

WO2010043741A1 - Led lamp

Info

Publication number: WO2010043741A1
Application number: PCT/ES2009/070427
Authority: WO
Inventors: Jordi Lopez Querol; Jaime Riba Picola
Original assignee: Lloansi Anglada, Pere; Palou Brau, Jordi
Priority date: 2008-10-16
Filing date: 2009-10-09
Publication date: 2010-04-22
Also published as: ES1068951U; ES1068951Y

Abstract

LED lamp, particularly suited to placement on surfaces, that comprises a plurality of high-power LEDs, a support plate for the LEDs, fitted with at least one electronic controller to control and power the LEDs, and a heat-dissipation plate, in which the controller is designed to automatically modify the power-supply current of the LEDs limiting or reducing their illumination intensity, as a function of at least one signal generated by a component inside or outside the lamp.

Description

D E S C R I P C I Ó N

"LED lamp"

Technical sector of the invention.-

The invention relates to a LED lamp for interior lighting such as homes or offices.

Background of the invention.- For the interior lighting of homes, offices and the like it is known to use lamps, of the recessed type or surface to be placed mostly on ceilings, which use incandescent light bulbs, known as low consumption or fluorescent tubes.

The use of this type of bulbs results in a low efficiency of energy use, since most of the energy is dissipated in the form of heat.

Similarly, the lifetime of the aforementioned bulb types is limited, so that when they melt at the end of their useful life they must be replaced with the consequent cost. In addition, this type of lamps is normally installed on ceilings and access to the bulbs is usually protected by a glass, so that the operation of changing the bulb is difficult.

The use of high power electro-luminescent diodes (LEDs) for lighting is also known, since it has advantages in terms of energy efficiency and consumption significantly lower than incandescent bulbs, in addition to having a life much higher than of incandescent bulbs, to the point where replacement is not necessary. However, high power LEDs are highly sensitive to overheating and require work at relatively low temperatures. In case of working at a temperature that is too high, its useful life decreases drastically, being able to melt immediately in high temperature situations. This causes that its use in recessed lamps is not possible because, in order to achieve a light power equivalent to a recessed lamp of the commonly known ones, a plurality of high power LEDs is necessary, a fact that aggravates the problem of overheating. In addition, high power LEDs are usually welded to the lamp, so it is practically impossible to change the LED elements cast by the user and the entire lamp would have to be replaced or call the technical service.

Explanation of the invention.-

The LED lamp according to the invention is particularly applicable to be placed on surfaces, such as ceilings or walls and comprises a plurality of high power LEDs; a support plate for the LEDs, equipped with at least one electronic controller for power and control of the LEDs and a heat dissipation plate.

The lamp is essentially characterized in that the electronic controller is adapted to automatically modify the power supply current of the LEDs by limiting or decreasing their lighting intensity, depending on at least one signal generated by an internal or external component of The lamp

A variant of interest of the lamp is characterized in that a first signal is generated by an interior component of the lamp, which is adapted to generate said signal when the temperature inside the lamp exceeds a certain threshold value.

According to another preferred variant, the lamp is characterized in that a second signal is generated by an external component of the lamp, which is adapted to generate said signal when a transducer element is actuated.

In a variant of the invention, the transducer elements are manually operated.

In another variant of the invention, the transducer elements are automatically operated. More specifically, in a specific variant of the invention, the transducer element is a light intensity sensor. In another variant of the invention, the transducer element is a presence sensor. The lamp according to the invention is also characterized in that each of the LEDs has a power greater than 3 watts.

According to another feature of the invention, the support plate of the LEDs and the heat dissipation plate are joined together by a heat conductive adhesive material. In another variant of interest, the LED support plate and the heat dissipation plate are fixed to each other by at least one rivet.

According to a preferred embodiment of the invention, the generated signal is transmitted through a communication channel, by means of the intervention of at least one emitting element and a corresponding receiving element.

In a variant of interest, the lamp according to the invention comprises an auxiliary dissipation plate disposed on the outer surface of the dissipation plate, improving the dissipation of the heat generated by the LEDs.

In another variant of the invention, the dissipation plate has a configuration essentially in the form of a spherical zone, closed by its smaller radius end, and the support plate mounted on its inner surface. In this way, the dissipation plate forms the directing focus of the light generated by the LEDs and to improve its reflectivity it can also be covered by its inner face by a layer of reflective material. The auxiliary dissipation plate can also have different reliefs to increase its surface exposed to the air and thus improve the dissipation, such as projections, flanges or battlements.

According to another characteristic, the auxiliary dissipation plate is annular and crown the dissipation plate. According to another feature of the invention, the central hollow of the auxiliary dissipation plate houses the receiving means, whereby a more compact lamp is achieved.

Brief description of the drawings.- The attached drawings illustrate, by way of non-limiting example, a variant embodiment of the invention. In these drawings:

Fig. 1 represents a bottom plan view of a lamp according to the invention;

Fig. 2 represents an elevation view section of a lamp according to the invention;

Fig. 3, represents an elevation view section of another variant of the lamp according to the invention;

Fig. 4, represents a top plan view of the variant of the lamp of Fig. 3; Y - TO -

Fig. 5 represents a scheme of the electronic light power control system in an installation.

Detailed description of the drawings.- In view of the figures it can be seen that the lamp object of the invention is a lamp 9 that contains a plurality of high power LEDs 1, in addition to electronic controls 7 for ignition and protection against possible Overheating situations that could damage the LEDs 1.

Fig. 1 shows a plan view of a lamp 9 composed of high power LEDs 1, mounted on an electronic support plate 2 that is solidly fixed to a dissipation plate 3 preferably by a layer of heat conductive adhesive material 4 and a rivet 5. The rivet 5 can be replaced in other embodiments of the invention by joining elements whose purpose is the same, such as a screw. The dissipation plate 3 is constituted by a material of high thermal conductivity, which helps to dissipate the heat generated by the LEDs 1 during its operation. The dissipation plate 3 can also comprise dissipating elements also constituted by a material of high thermal conductivity to increase the heat dissipation effect of the dissipation plate 3, these dissipating elements can be of the type of heat dissipators known in the state of The technique The dissipation plate 3 is covered on its inner face with a reflective layer 6 to improve the projection of the light emitted by the LEDs 1 to the outside of the lamp 9. In addition, electronic controllers 7 of the LEDs 1 are incorporated, which allow regulate the light output emitted by the LEDs 1 through a square pulse train with variable duty cycle, at a sufficiently high frequency so that the efficient light output emitted by the LEDs 1 can be varied, without said pulses being perceptible to the human eye, so that when the controller 7 increases the duty cycle of the pulse train, an increase in the light output generated by the LEDs 1 is perceived and, when the controller 7 decreases the duty cycle of the square pulse train , a decrease in the light power generated by LEDs 1 is perceived. The electronic controllers 7 further comprise a temperature sensor through which they can detect if the safety temperature has been exceeded for the proper functioning of the LEDs 1. This can happen when the dissipation plate 3 does not dissipate enough heat to keep the working temperature of the support plate 2 of the LEDs 1 below the safety limits for the proper functioning of the LEDs 1. The controllers 7 are mounted on the same support plate 2 of the LEDs 1. Naturally, the invention also contemplates the possibility that the controllers 7 are located outside the housing 1 1 of the lamp, also being connected to the LEDs 1.

The LEDs 1 are designed to never have to be replaced throughout the life of the lamp 9, given the longevity of said components, and for this reason they are welded in the support plate 2. However, the LEDs 1 they are very sensitive to temperature increases and if they work above the safety temperature, their useful life would be drastically reduced, reaching the point of melting instantly, so that the entire lamp should be replaced 9. To avoid In this overheating situation, the controllers 7 monitor the temperature sensors and, if it exceeds the operating safety temperature of the LEDs 1, the duty cycle of the supply pulses of the LEDs 1 is temporarily reduced, so that Stop the increase in temperature and favor the cooling of the support plate 2 and therefore of the LEDs 1. By getting the desired temperature levels of the Ia to be restored support plate 2, the duty cycle of the power pulses of the LEDs 1 is restored again. In another embodiment of the invention, the electronic controllers 7 generate an eminently continuous signal to power the LEDs 1, so that the intensity of the light emitted by the LEDs 1 can be set by the user by means of the value of said continuous signal. Likewise, in another variant of the invention not shown, it is possible to set a maximum value of the intensity that can be delivered to the LEDs 1, so that the safety temperature for the operation of the LEDs 1 is not exceeded. Fig. 2 shows an elevation section of the lamp 9, in which one can observe the way in which the support plate 2 is solidly attached to the dissipation plate 3 by means of the layer of heat conductive adhesive material 4 and the rivet 5. This favors that all the heat generated by the LEDs 1 can be efficiently transmitted to the dissipation plate 3 to maintain a safe working temperature for the proper functioning of the LEDs 1. The dissipation plate 3 also forms the directing focus of the light emitted by the LEDs 1, in the same way as in the known recessed lamps, being covered by its inner face by a reflective material 6. In this way a directing focus is not necessary of light in addition to the dissipation plate 3, since it acts as such. The dissipation plate 3 is covered by the housing 1 1, which in addition to acting as a beautifying element for the lower part of the lamp 9, provides the lamp 9 with fastening means for installation in ceilings. In the same way as in the recessed lamps known in the state of the art, the support plate 2 and, therefore, the LEDs 1, are protected from the outside through a removable glass 10, attached to the ends of the housing 1 1 by means of tweezers 12, which can act as a diffuser of the light emitted by the different LEDs 1 and which can be used to access the support plate 2 by the technical service in case of failure. The crystal 10 can also be used to direct the light beam by means of optical elements, as is known in the state of the art, such as, for example, fresnel lenses.

Figs. 3 and 4 present a variant of the invention in which the lamp 9 is provided with an auxiliary dissipation plate 29, annular plan, which crowns the dissipation plate 3. Naturally, in other variants of the lamp 9, the dissipation plate Auxiliary 29 may have other ways to adapt better to the dissipation plate 3 and thus allow a better heat dissipation. In the variant of Figs. 3 and 4, the auxiliary dissipation plate 29 is attached to the dissipation plate 3 to allow transmitting part of the heat generated by the LEDs 1, which is transmitted from the dissipation plate 3 to the auxiliary dissipation plate 29. Said plate Auxiliary dissipation 29 is metallic, with which it is possible to conduct and dissipate the heat received. Being an annular plant, the auxiliary dissipation plate 29 is arranged in contact with the area of the dissipation plate 3 that is most heated by being closer to the LEDs 1, so that it helps the temperature to be maintained for longer time below the operating safety temperature of the LEDs 1, even overheating situations are avoided and, consequently, it is not necessary to limit the intensity delivered to them to reduce the temperature. The auxiliary dissipation plate 29 can also have different ways to increase the exposure surface, being able to present tabs, festoons or the like, in the manner known in the state of the art, with which a better thermal exchange with the air is achieved by having more exposed surface. By means of the auxiliary dissipation plate 29, it is thus possible to improve the heat dissipation to maintain a safe working temperature for the proper functioning of the LEDs 1 In order for the user to modify the brightness levels of the room, a system of control as shown in Fig. 5 by way of example, since the components of the control system will vary depending on the number of lamps 9 installed and the options that the customer decides to communicate with them. The desired level of luminosity is configured through the information collected by the transducer elements 22, which can be manual such as switches, potentiometers or remote controls, or automatic such as ambient or presence light sensors and is transmitted by the elements transmitters 23 to the receiving elements 24 through a communication channel 25. Said receiving elements 24 can be separated from the lamp 9 or incorporated in the lamp 9, as shown in the variant of Figs. 3 and 4, with which it is possible to integrate the receiving elements 24 in the central hollow 29a of the auxiliary dissipation plate 29. In order not to damage the receiving elements 24, insulating means 24a must be provided between the receiving means 24 and the dissipation plate 3 to prevent overheating and damage.

The signals generated by the different transducer elements 22 can be used in combination, so that, for example, the signal generated by a presence detector can be combined with the signal generated by an ambient light intensity detector to establish the level of Nu - Mining necessary by the lamp 9.

The emitting elements 23 and receivers 24 are designed so that they can communicate by means of a pre-established digital protocol through the communication channel 25, such as the EIA-485.

It is also possible to transmit the desired level of brightness remotely by remote elements 26 that integrate transducers 22 and transmitters 23, such as computers or telephones, using as communication network 28, networks such as the switched telephone network or an IP network (LAN, Internet...). The information collected and sent by the remote elements 26 is received and processed by adapter elements 27, which convert the incoming signal into a signal that can be interpreted by the receiving elements 24 and inject said signal into the communication channel 25.

Using the control system described, the brightness level of the lamps 9 can be selected locally or remotely. The receiving elements 24 decode the received signal and act on the controllers 7 establishing, according to the received data, the level of brightness of the LEDs 1.

Claims

1.- Led lamp (9) (1), particularly applicable to be placed on surfaces, comprising a plurality of high power LEDs; a support plate (2) of the LEDs, equipped with at least one electronic control and power controller (7) of the LEDs and a heat dissipation plate (3), characterized in that the controller (7) is adapted to modify , automatically, the supply current of the LEDs (1) limiting or decreasing their intensity of illumination, depending on at least one signal generated by an interior or exterior component of the lamp.

2. Lamp (9) according to claim 1 characterized in that a first signal is generated by an interior component of the lamp, which is adapted to generate said signal when the temperature inside the lamp exceeds a certain threshold value.

3. Lamp (9) according to any one of the preceding claims characterized in that a second signal is generated by an external component of the lamp, which is adapted to generate said signal when a transducer element (22) is actuated.

4. Lamp (9) according to claim 3 characterized in that the transducer elements (22) are manually operated.

5.- LED lamp (9) (1) according to claim 3 characterized in that the transducer elements (22) are automatically operated.

6. Lamp (9) according to claim 5 characterized in that the transducer (22) is a light intensity sensor.

7. Lamp (9) according to claim 5, characterized in that the transducer (22) is a presence sensor.

8. Lamp (9) according to any one of the preceding claims, characterized in that each of the LEDs (1) has a power greater than 3 watts.

9. Lamp (9) according to any one of the preceding claims, characterized in that the support plate (2) of the LEDs (1) and the heat dissipation plate (3) are joined together by a conductive adhesive material of the heat (4).

10. Lamp (9) according to claim 4, characterized in that the support plate (2) of the LEDs (1) and the heat dissipation plate (3) are fixed together by at least one rivet (5).

1 .- Lamp (9) according to any one of the preceding claims characterized in that the generated signal is transmitted through a communication channel (25), by means of the intervention of at least one emitting element (23) and a corresponding receiving element (24).

12. Lamp (9) according to any one of the preceding claims, characterized in that it comprises an auxiliary dissipation plate (29) disposed on the outer surface of the dissipation plate (3).

13.- Lamp (9) according to the preceding claim, characterized in that the dissipation plate (3) has a configuration essentially in the form of a spherical zone, closed by its smaller radius end, and which has its internal surface mounted on the plate support (2).

14.- Lamp (9) according to the preceding claim, characterized in that the auxiliary dissipation plate (29) is annular and crowns the dissipation plate (3).

15. Lamp (9) according to the preceding claim, characterized in that the central hollow (29a) of the auxiliary dissipation plate (29) houses the receiving means (24).