EP2260675A2

EP2260675A2 - Light, in particular for obtaining a light spectrum similar to daylight

Info

Publication number: EP2260675A2
Application number: EP09717149A
Authority: EP
Inventors: Martin Häge; Helmut Grantz; Gunnar Helms
Original assignee: MBB International Group AG
Current assignee: MBB International Group AG
Priority date: 2008-03-06
Filing date: 2009-03-05
Publication date: 2010-12-15
Also published as: WO2009109381A2; WO2009109381A3; DE102008013048A1

Abstract

The invention relates to a light, in particular for obtaining a light that is similar to daylight, comprising a board (12) that houses LED-illuminating means wherein at least white LEDs (26, 27) and coloured LEDs (22, 23, 24) are provided as LED illuminating means. Said board (12) comprises at least one light module (14), comprising at least two stands (21) with LEDs (22, 23, 24, 26, 27) and the at least one light module (14) can be controlled by a current supply (16) and a control device (18). A control valve (36) is provided in the control device (18) for each strand (21).

Description

Luminaire, in particular for achieving a daylight-like luminous spectrum

The invention relates to a luminaire, in particular for achieving a daylight-like luminous spectrum, with a board receiving a plurality of LED illuminants, wherein at least one white LED and one colored LED are provided as the LED illuminant.

The operation of a luminaire with LEDs is already known in principle. The LED bulbs are mostly used as individual lights that emit a specific color spectrum. However, to achieve a daylight-like spectrum, it is necessary for multiple LEDs to interact. It is also necessary that complex lighting systems are set up, which allow a larger room, into which no or only partial daylight falls, through such a daylight. light-like spectrum to illuminate. The previous LEDs require due to the respective individual installation increased effort for installation and control.

The invention is therefore an object of the invention to provide a lamp with LED bulbs, which is constructed in a modular manner and allows easy adaptation to different installation conditions.

This object is achieved by the features of claim 1. Further advantageous embodiments and further developments are specified in the further claims.

By the design of a luminaire with a circuit board, which has at least one light module, which consists of at least two strands with LEDs and by a power supply and control device, which drive the at least one light module, each strand of the light module is driven by a controller of the control device, is adapted to the installation situation interpretation of the lamp in a simple manner. For example, the power supply and control device may be provided in the luminaire or may be arranged adjacent or even remote from the luminaire. Due to the modular design of a basic unit for a luminaire, a high degree of flexibility is given.

According to a preferred embodiment of the invention it is provided that the power supply and control device are provided on the board, which receives at least one light module and forms a master module. As a result, a completely integrated system is formed, which includes all the components needed to form a lamp.

Furthermore, it is preferably provided that the power supply and control device are provided as a separate unit to the board, which receives the at least one lighting module. Such an arrangement is a so-called daughter module. This has the advantage that it can be docked or plugged directly to the master module can and the LEDs of the at least one lighting module are supplied by the power supply and control device of the master module. Thus, one or more daughter modules can preferably be inserted in series with one another and docked on the master module, so that large-area luminaires can be created in a simple manner.

According to a further alternative embodiment of the invention, it is provided that the power supply and the control device each form a separate structural unit and are provided separately from the circuit board, which receive at least one light module. Such an arrangement can facilitate subsequent retrofitting to the luminaire according to the invention, as this allows a flexible installation of the components. Furthermore, a large-area distribution of LEDs for a luminaire can also be made possible. This large-area distribution can be particularly promoted by the fact that the individual strands of a light module are also arranged separately from each other.

According to a further advantageous embodiment of the invention, it is provided that the master and / or daughter module have at least one temperature sensor. As a result, a separate temperature detection can be made possible in the region of the respective module in order to effect, via a suitable control intervention, that there is no overheating of the luminaire.

Each strand in the light module preferably has an individual number of LEDs. As a result, a lamp adapted to the requirements can be produced. For example, this makes it possible for the number of colored and white LEDs to be matched to one another, as well as the combination in the arrangement of the colored and white LEDs relative to one another. In addition, a specific power control can be made possible for each strand. This has the advantage that a uniform, comparable to the sunlight in the visible range spectral profile can be achieved. By such a vote in the number of LEDs, their combination and their performance a homogeneous illumination can be achieved without causing color spots.

According to a further preferred embodiment of the invention, it is provided that a plurality of LEDs combined in one strand are connected in series. This allows easy control and power supply. Preferably, the power supply module is designed such that a plurality of LEDs provided in a string can be operated simultaneously, so that a flexible stringing together of daughter modules is possible. For example, with input voltages of 90V to 230V, up to 100 LEDs can be connected in series when operated at approximately 3V.

According to a further preferred embodiment of the invention, it is provided that a plurality of LEEDs combined in one strand have the same wavelength. This allows a simple, but also specific control enable, which can be achieved that the gaps within, for example, a white light can be substantially filled by colored LEDs to achieve a homogeneous to the eye illumination without color spots.

Furthermore, it is preferably provided that one or more daughter modules can be connected to a master module and preferably one or more daughter modules can be connected in series to one another at this master module. Such a master module may comprise at least one light module with a plurality of strands on a board, at the same time the required power supply, control and regulation is provided on the board. This enables the master module, regardless of the housing form, to achieve an optimum lighting system and to replicate the daylight sequence. In addition, a previously existing luminaire, or a conventional lighting system, can be replaced and retrofitted by at least one such master module. The daughter modules comprise one or more strands that form a light module and are provided on a circuit board. These daughter modules can be connected to the master module and are preferably connected in series. The control and regulation as well as the The daughter modules are powered by the master module. This provides a modular design that allows flexible adaptation to different geometries of the luminaires.

The power supply for the luminaire according to the invention comprises at least one fuse, a mains filter, a rectifier, an active error correction module, a programmable microprocessor and a signal demodulator. Such a power supply generates, for example, a DC voltage of 400 V, which are provided for driving the strands of the at least one light module.

According to a further preferred embodiment of the invention it is provided that the power supply and the control device is connected upstream of an adapter device. Such an adapter device makes it possible to modulate control signals for driving the luminaire onto the mains current. Thus, not only the electrical power with mains voltage, but also at least one digital control signal can be transmitted via a connecting line.

According to a preferred embodiment of the adapter device, an evaluation unit for signals is provided in the adapter device, which are transmitted by the master and / or daughter module. This allows, for example, the monitoring of each strand and in particular whether one or more LEDs have failed.

According to a further preferred embodiment of the adapter device is provided that signals from sensors can be controlled. Such sensors may be temperature sensors or brightness sensors. In particular, the brightness sensors can be used to detect the actually prevailing daylight in the room and accordingly output a power control for the light module.

According to another preferred embodiment of the invention, it is provided that the adapter module comprises a real-time clock. Thus, after switching on the light system by the real-time clock first a preprogrammed brightness according to the time of day by driving the LEDs can be achieved. This brightness can be adjusted accordingly depending on the acquired data of the brightness sensor.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

FIG. 1 shows a schematic view of a luminaire as a block diagram,

Figure 2 is a schematic view of a modular structure of the control of the lamp,

Figure 3 is a schematic view of another alternative

Structure of a lamp to Figure 2 and

Figure 4 is a schematic representation of a block diagram of a

Adapter device.

1 shows a schematic representation of a lamp 11 is shown as a block diagram. This luminaire 11 comprises a circuit board 12, on which a light module 14 is provided. In this embodiment, only one light module 14 is provided. However, it is also possible for a plurality of light modules 14 to be arranged on the circuit board 12. This light module 14 is supplied by a power supply 16 and a control device 18. By this arrangement, a completely integrated system is created in which all modules are summarized. Such a populated board 12 is referred to as a master module.

The light module 14 preferably consists of at least two strings 21 with LEDs as the light source. Preferably, five strands 21 are combined to form a light module 14, wherein three strands 21 a first Group with colored LEDs and the two other strands 21 form a second group with white LEDs. The first group of colored LEDs comprises an LED 22 with a wavelength of, for example, 490 nm to 510 nm with the color cyan, an LED 23 with a wavelength of 625 nm to 635 nm, which outputs the color red and an LED 24, with a wavelength of 590 nm to 605 nm, which outputs the color yellow-orange. Alternative color combinations are also possible. The second group of white LEDs comprises, for example, a cool white LED with a color temperature of about 6000 ⁰ K and the warm white LED a color temperature of, for example 3500 ⁰ K. The combination of warm white and cold white LEDs makes it possible, by changing the ratios of the light output in principle, a warmer or to create a cooler lighting mood. Since the white LEDs 26, 27 mainly depict the area of the sensitivity curve of the eye, usually sufficient pronounced spectra are missing in the yellow, red and also cyan spectral range. Therefore, the white ones are combined with colored LEDs that have their maximum spectrum just in the missing spectrum range of the white LEDs. This allows the realization of a uniform spectral profile.

In each strand 21, two or more LEDs are provided with the same wavelength. The strands 21 are connected in parallel by the control device 18.

The power supply 16 includes at least one fuse, a rectifier, a line filter and an optional active error correction module to prevent disturbing feedbacks on the network. In addition, other suitable components are present, such as a control module 32 for the correct DC voltage, a driver for the network communication 33, a serial interface 34, provided for each strand 21 controller 36 and a temperature sensor 37. At the terminals 38, the network with Input voltages from about 65 V to about 265 V are connected. For certain applications, however, it may be useful to limit the input voltage range downwards, for example, to recommend an input voltage from 200 V. As an output voltage, the power supply 18 generates a DC voltage of 400 V regardless of the mains voltage, which is passed via lines to each of the parallel connected controller 36.

In front of the control module 32, a serial interface 34 is arranged, via which the control module 32 can be programmed by means of an external programming device. The control module 32 contains in a memory module all programs and data required for internal and external communication and for the regulation and control of the LEDs 22 to 27 in order to simulate the daylight in the individual program steps. The controller 36 are constructed in the manner of a switching power supply and provide the required for the LEDs 21 to 27 regulated output current via the lines leading to the lines 21 available. The information about the respectively required control state is received from the control module 32 via the lines 41.

The temperature sensor 37 detects the temperature of the circuit board 12 in the region of the light module 14, which is heated by the LEDs 21 to 27. The acquired data is transmitted to the control module 32 and evaluated there by the stored program. For example, in a simple program version, at temperatures that are higher than the stored limit temperature, the LED currents of the strands 21 are lowered in percentage so that the limit temperature is no longer exceeded. In a further version, the temperature characteristics of the LEDs can be stored in a table, and depending on the temperature, the currents of the individual strands 21 are readjusted so that the color temperature of the emitted light is maintained according to the current switching state.

The proposed power supply 16 has the advantage that it can be variably connected to different mains voltages and mains frequencies and can supply a variable number of LEDs 22 to 27 of the respective string 21. In addition, the power supply 16 has the advantage that different numbers and power classes of LEDs 22 to 27 can be operated, whereby the Einsatz- spectrum is significantly expanded. Furthermore, the power supply 16 has the advantage that no transformer is used for voltage conversion for the power supply 16 of the LEDs 22 to 27, whereby this power supply 16 can build very flat. Only a suitable rectifier system is used for this purpose. In addition, current limiters are provided which provide the required low-power DC currents to power the LEDs.

The lamp 11 can be programmed in various ways.

A first variant is given by the fact that the lamp 11 lights up with a permanently set light spectrum as soon as it is switched on via a light switch. As a result, the lamp 11 can be replaced with existing conventional lights without further changes. For example, a circuit board 12 may be formed according to Figure 1 as such.

FIG. 2 shows a further variant of a construction for a luminaire 11. In this lamp 11, an adapter device 45 is interposed between a switch 44 and a lamp 11. Such adapter modules are arranged close to the operating system or programming system and have the task to digitally aufzumodulieren the control signals for controlling the lamp 11 to the power supply, for example, 220 V AC to control the light module. In the control device 18, in turn, corresponding components are provided to filter out these control signals, so that the individual strings 21 of the light module 14 are driven accordingly. A formed by the power line 46 between the adapter device 45 and the lamp 11 data bus works bidirectionally, so that not only signals are transmitted to the lamp 11, but also signals from the lamp 11 can reach adapter devices 45. Thus, there is the possibility of diagnosis. As a result, temperature controls via the temperature sensor 37 can be made possible, for example. An optionally detected temperature profile can be output on a monitor which can be connected via the serial interface 34 of the adapter module 45. This feature also applies to the power line 47 between the switch 44 and the adapter device 45.

The adapter device 45 is shown in more detail in FIG. This includes a voltage converter 51 with low power, which supplies the other components described below in the adapter device 45 with appropriate voltage. A processor 52 evaluates signals of an operating system, wherein the operating system may be provided instead of the switch 44 or coupled signals at this point. Furthermore, the processor 52 can evaluate signals of a real-time clock 53 and generates therefrom an information data record. This is forwarded to a converter module 54, which converts the received signals into a digital signal, which can be evaluated by the controller 18 of the lamp 11. Conversely, this converter module 54 modulates signals which pass from the luminaire 11 via the power line 46 to the adapter device 45. The adapter device 45 shown in Figure 3 is in principle de-energized when the lamp 11 is turned off. The real time clock 53 has an energy accumulator, not shown, in the form of a rechargeable battery or capacitor, which can be buffered during the switch-on, so that the phases are bridged, in which the lamp 11 is turned off. Alternatively, a battery can be used.

The converter module 54 receives its information via a connecting line from the processor 52. Data bus lines 48 transmit signals from the operating system or switch 44 to the processor 52 via which the at least one light module 14 can be controlled and adjusted as needed. The data bus 48 may be formed, for example, as a serial data line.

In another embodiment, the operating system is connected via the data bus 48 to the processor 52 and the line 59 to a serial interface 34. An external control and diagnostic device 56 can be connected to the serial interface 34. Furthermore, this serial interface 34 can be used for programming or servicing. FIG. 4 shows a block diagram of a lighting system consisting of several modules. A switch 44 or an operating system, which may likewise comprise a switch, is connected to an adapter device 45, wherein additionally a data bus can connect the two components to one another. From the A- daptereinrichtung 45 from a power line 46, which also simultaneously forms the data bus between adapter module 45 and lights, which supplies a plurality of lights arranged in parallel, which may also have a different structure. The luminaire 11 comprises a structure according to FIG. 1, that is to say that a light module 14, the power supply 16 and the associated control device 18 are provided on a common circuit board 12. Furthermore, the power line 46 supplies a module consisting of a control device 18 and a light module 14 and thus represents the lamp 11 '. In addition, the power line 46 leads from the adapter device 45 to a further variant of the lamp 11 ", in which a module consisting is provided from a power supply 16 and a control device 18, wherein the respective strands 21 are provided separately in space.

Furthermore, it can be provided that further daughter modules can be docked to the existing light modules, for example, in the luminaires 11 and 11 '. The same applies to the strands 21, to which further strands can be docked.

The embodiment variants shown in FIG. 4 show the modular construction according to the invention for producing a luminaire 11 and for forming a luminous system.

Claims

claims

1. Lamp, in particular for achieving a daylight-like light, with a LED illuminant receiving board (12), wherein at least white LEDs (26, 27) and colored LEDs (22, 23, 24) are provided as LED illuminants, characterized in that the circuit board (12) has at least one light module (14) which consists of at least two strands (21). with LEDs (22, 23, 24, 26, 27) and that the at least one light module (14) by a power supply (16) and a control device (18) is controllable, wherein for each strand (21) a controller (36) in the control device (18) is provided.

2. Lamp according to claim 1, characterized in that the power supply (16) and control device (18) on which the at least one light module (14) receiving the board (12) are provided and form a master module.

3. Lamp according to claim 1, characterized in that the master module comprises a temperature sensor (37).

4. Lamp according to claim 1, characterized in that the power supply (16) and the control device (18) are provided as a separate unit.

5. Lamp according to claim 1, characterized in that the power supply (16) and the control device (18) each form separate units.

6. Lamp according to claim 1, characterized in that a board with at least one light module without power supply (16) and without control device (18) forms a daughter module and preferably comprises a temperature sensor (37).

7. Lamp according to claim 1, characterized in that each strand has an individual number of LEDs (22, 23, 24, 26, 27).

8. Luminaire according to claim 1, characterized in that several in a strand (21) combined LEDs (22, 23, 24, 26, 27) are electrically connected in series.

9. Lamp according to claim 1, characterized in that a plurality of strand (21) arranged LEDs (22, 23, 24, 26, 27) have the same wavelength.

10. Lamp according to claim 2, characterized in that one or more daughter modules can be connected to a master module and preferably a plurality of daughter modules can be connected in series to one another at this master module.

11. Luminaire according to claim 1, characterized in that the power supply (16) is constructed at least from a fuse, a line filter, a rectifier, an active error correction module, a programmable microprocessor and a signal demodulator.

12. Light according to one of the preceding claims, characterized in that the power supply (16) and the control device (18) is preceded by an adapter device (45) which modulates signals onto a power line (46), which is also provided as a data bus.

13. Luminaire according to claim 12, characterized in that the adapter device (45) evaluates signals of the master or daughter module or signals via a data bus (48) from an operating system or light module (14).

14. Luminaire according to claim 12 or 13, characterized in that by the adapter device (45) sensors, in particular Hellig keits- or temperature sensors (37), or a real-time clock (53) are controllable.