WO2010121925A1

WO2010121925A1 - Lighting apparatus having a lighting function that can be varied over time

Info

Publication number: WO2010121925A1
Application number: PCT/EP2010/054819
Authority: WO
Inventors: Thomas Schmacht
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2009-04-24
Filing date: 2010-04-13
Publication date: 2010-10-28
Also published as: DE102009018868B4; TW201042193A; DE102009018868A1

Abstract

The invention relates to a lighting apparatus having a lighting function that can be varied over time and to a method for operating a lighting apparatus. Means (5) for detecting a supply voltage UNetz of the lighting device (1) and means (5) for influencing the lighting function in case of a temporary interruption of the supply voltage UNetz are provided. The lighting function is influenced by means of a temporary actuation of an external operating element, in particular a switch for interrupting the power supply.

Description

description

Lighting device with a time-varying lighting function

Technical area

The invention relates to a lighting device with a time-varying lighting function. The invention also relates to a method for operating a lighting device.

State of the art

Lighting devices often have time-varying lighting functions, i. The light emitted by the lighting device is changed in its properties, for example, the color, the brightness or the color temperature of white light, with the passage of time. Depending on the application, this can be done selectively or according to a random or pseudo-random principle.

In particular, in lighting devices that have multicolored light emitting diodes (LEDs) as light source and thereby can emit light in almost any color, the light is often emitted in the form of continuously changing colors.

To control lighting functions, complex control devices are often used which make it possible, for example, to set a desired color or brightness precisely or to display a defined sequence of colors and / or brightnesses. To operate the control devices and thus the lighting device are usually complex controls required borrowed. In addition, the control device must be constantly in standby, which requires a high energy demand.

In so-called retrofit lamps, i. Lamps that are provided to replace conventional incandescent lamps, is also in the lamp no room for a complex control device and / or controls. These lamps are usually used in luminaires which are connected to the general power supply by means of a simple switch which establishes or interrupts the current flow for switching the lighting on or off. Thus, after interrupting the power supply for a control unit no more energy available.

In such lamps, it is known to set a desired color by means of small sliding or rotary control on the retrofit lamp itself. The disadvantage of this, however, is the poor operability, since these controllers are difficult to adjust due to the small dimensions and the lamp is also often difficult to access, for example, due to the installation in a lamp or on a ceiling.

Presentation of the invention

The object of the present invention is to provide a lighting device with a time-varying lighting function, in which the lighting function can be influenced by means of simple means. It is furthermore an object of the invention with regard to the method for operating a lighting device to provide a method with which in a simple manner ne lighting function of the lighting device can be influenced.

This object is achieved with respect to the lighting device by the characterizing features of claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

By means for detecting a supply voltage of the lighting device and means for influencing the lighting function are provided in a short-term interruption of the supply voltage, a simple way is given to change the lighting function, for example by means of a usually already existing switch by this briefly the power supply, ie shorter than 2 s, preferably shorter than 1 s, is interrupted, without providing independent controls for it. To avoid responding to random voltage fluctuations or interruptions, the duration of the interruption must be longer than 25 ms, preferably longer than 50 ms, to trigger a change in the lighting function.

By the temporally variable illumination function comprises a temporally successive emission of light having at least two different wavelengths, it is possible to realize illumination in temporally successive different colors.

By providing the temporally variable illumination function a temporal successive emission of white light having at least two different color temperatures comprises, it is possible to realize a lighting in temporally successive different color temperatures.

Since the time-varying illumination function comprises a temporally successive emission of light with at least two different intensities, it is possible to realize a dimmable illumination.

It is expedient if the lighting function can be switched over by means of the brief interruption of the power supply from a time-varying lighting function to a lighting function that is constant over time, in particular into the lighting function present at the time of the interruption. As a result, this position can be maintained when a desired illumination state, for example a specific color, color temperature and / or brightness, is reached. However, embodiments are also conceivable in which switching from an arbitrary state at the time of triggering to a defined state which did not exist when triggered, for example from a color to white light or from a dimmed state to full brightness.

Furthermore, it is expedient if the lighting device is switchable in a fixed illumination function by means of a second short-term interruption of the power supply of the temporally constant lighting function in a time-varying lighting function. Thus, at any time, a return to the original or another, temporally verander borrowed, operating mode take place. It is advantageous if the lighting device comprises at least one short-term energy store, in particular a capacitor. As a result, the energy can be made available to a device for detecting the supply voltage and for the means for influencing the illumination function during a brief interruption of the supply voltage.

Conveniently, the lighting device comprises at least one microprocessor. As a result, both the detection of the supply voltage as well as the control of the lighting function. In addition, LED retrofit lamps often already have a microprocessor, so that a function according to the invention can be integrated without much effort.

Advantageously, after a prolonged interruption of the power supply, the existing before the interruption of the power lighting function can be restored. In this way, when the lighting device is turned off in a targeted manner, it is ensured that no renewed setting of the desired lighting function, that is, for example, a preferred color or brightness level, has to be performed after switching on. Any interruption that exceeds a predetermined limit, in particular 2 s, preferably 1 s, is regarded as longer. Also, any interruption is considered to be a prolonged interruption in which the microprocessor no longer has enough power available for its operation, particularly to detect a reconnection of the supply voltage. With regard to the method for operating a lighting device, the object is achieved by influencing the lighting function by means of a brief actuation of an external operating element, in particular a switch for interrupting the power supply. This provides an easy way to change the lighting function by means of a usually already existing switch in the supply to the lighting device by the power supply for a short time, ie shorter than 2 s, preferably shorter than 1 s, is interrupted, without providing independent controls for it ,

It is advantageous if the time-varying illumination function comprises a temporally successive emission of light with at least two different wavelengths. This makes it possible with simple means to realize a lighting in different colors.

Furthermore, it is advantageous for the temporally variable illumination function to include a temporally successive emission of light with at least two different intensities. This makes it possible to realize a dimmable lighting.

In an advantageous development of the invention, the time-varying illumination function comprises a time-sequential emission of white light with at least two different color temperatures. As a result, the color temperature of the lighting can be adjusted by simple means. It is expedient if the lighting function is switched by means of the temporary interruption of the power supply from a time-varying lighting function into a temporally constant lighting function, in particular in the present at the time of interruption lighting function. As a result, upon reaching a desired illumination state, for example a specific color and / or brightness, this position can be maintained. However, embodiments are also conceivable in which an arbitrary state at the time of triggering switches to a defined state which did not exist when triggered, for example from a color to white light or from a dimmed state to full brightness.

Brief description of the drawings

In the following, the invention will be explained in more detail with reference to an embodiment. The figures show:

1 shows a LED retrofit lamp as an example of a lighting device according to the invention,

2 is a graph of voltage waveforms in a momentary interruption of the supply voltage of the lighting device,

Fig. 3 is a graph of voltage waveforms in a long-lasting interruption of the supply voltage of the lighting device. Preferred embodiment of the invention

1 shows an LED retrofit lamp 1 as an example of a lighting device 1 according to the invention. In such lighting devices 1, which are preferably used as a replacement for conventional incandescent lamps and therefore with a standard socket 2, here a so-called E27 screw base 2, and often a bulb 3 are provided, LEDs 4 serve as a light source. In the present embodiment is a so-called RGB diode 4, i. it is possible to generate light in the red (R), green (G) and blue (B) range and also any mixtures thereof, in particular white light.

Such retrofit lamps 1 are like the so-called

Effect lighting used, i. They radiate in a specific color or permanently changing color, so as to create a pleasant for the operator mood.

For driving the LED 4, a microprocessor 5 is provided, which is supplied by means of an AC / DC converter 6 with voltage. Furthermore, an input 7 of the microprocessor 5 is connected to the supply voltage U _Net z. The AC / DC converter 6 comprises a capacitor 8, which essentially serves for smoothing the output voltage UD _C during normal operation.

FIG. 2 plots a time profile of a supply voltage U _Net z of the lighting device 1, the output voltage U _D c of the AC / DC converter 6, and the state of the lighting function over time t. In this case, the color change operation of the LED 4 is referred to as a function Fl, ie, an operating mode in which the color emitted by the lighting device 1 is determined according to FIG a predetermined sequence by varying the intensity of the individual colors of the RGB LED 4 is varied.

If the supply voltage U _Net Z, as shown schematically in Figure 2 above, briefly interrupted, the capacitor 8 of the AC / DC converter 6 serves as an energy storage 6 and thus ensures that the microprocessor 5 continues to supply the voltage U _D c can be and continue to operate. The LED 4 is disabled immediately to save energy. As a result, either the capacitor 8 can be designed with a smaller capacity or, for a given capacity, the microprocessor 5 can be operated longer. After a time t _x where t _min <t _x <t _max, the supply voltage U _Net z is at input 7 again detected, so that the micro- processor 5 recognizes that only a brief voltage interruption is present and a function change to a function F2 it is asked for. The function F2 means that the lighting device 1 continues to illuminate with the color with which it was operated at the time when the supply voltage U _Net Z was switched off.

If the supply voltage U _Net z is interrupted again for a time t X, the microprocessor 5 is a downshift to the function Fl made, ie the lamp 1 is operated again in the color change mode. In order to avoid a changeover of the lighting function in the event of brief mains voltage fluctuations or failures, a minimum time t _{min is determined} for the detection of a desired interruption. In this case, a time of more than 25 ms, particularly preferably more than 50 ms, has proved to be advantageous. The time t _max is chosen so that on the one hand an operator easily the double circuit on the other hand, the capacity of the capacitor 8 must not be designed to be too large, as this would lead to space problems and increase the manufacturing cost.

FIG. 3 shows the variables shown in FIG. 2 for the case in which the supply voltage U _Net Z is permanently interrupted, for example by means of a light switch or by a power failure. After the time t _{max has} elapsed, the output voltage U _D c of the converter 6 collapses and the microprocessor 5 stops operating. After the supply voltage U _Net z and thus also the converter voltage U _D c is applied again, the LED 4 are also supplied with power and resume operation with the previously completed lighting function again.

Of course, other embodiments of the invention are conceivable. Thus, in particular instead of a color gradient, a different temporally variable light function may also be present. In this case, for example, a change in intensity can be made. It is also conceivable that, instead of a continuous color progression, individual colors are emitted for a predefined time in order then suddenly to change to a distinctly different color, which allows the operator to select a very specific color very reliably. It is also conceivable to switch from one color to the next by the brief interruption of the current signal or to switch between two different color gradients, which differ, for example, by a different speed of the color change. Furthermore, it is conceivable that after a prolonged interruption of the supply voltage, the existing in the state of delivery light function is activated again.

The construction of the lighting device 1 may differ from that shown. Thus, the lighting device 1 does not necessarily have to be designed as a retrofit lamp 1, even if the advantages of the invention are particularly effective here. Furthermore, of course, other base and / or piston forms can be used. It is also conceivable to use other light sources, wherein LEDs 4 of other or additional colors, such as, for example, amber or white, are conceivable as well as, for example, organic light-emitting diodes. Instead of the LED 4, other light sources, such as discharge lamps are possibly conceivable, but is particularly well suited for use in a lighting device according to the invention in LEDs due to the fast response and low power consumption.

Claims

claims

1. lighting device (1), in particular LED retrofit lamp (1), with a time-varying lighting function, characterized in that means (5) for detecting a supply voltage U _Net z of the lighting device (1) and means (5) for influencing the lighting function are provided for a brief interruption of the supply voltage U _Ne tz.

2. Lighting device (1) according to claim 1, characterized in that the time-varying illumination function comprises a temporally successive emission of light having at least two different wavelengths.

3. Lighting device (1) according to claim 1 or 2, characterized in that the time-varying illumination function comprises a temporally successive emission of white light having at least two different color temperatures.

4. Lighting device (1) according to one of claims 1 to 3, characterized in that the time-varying illumination function comprises a temporally successive emission of light having at least two different intensities.

5. Lighting device (1) according to one of claims 1 to 4, characterized in that the illumination function by means of the short-term interruption the current supply of a time-varying illumination function in a temporally constant illumination function, in particular in the present at the time of interruption illumination function, is switchable.

6. lighting device (1) according to one of claims 1 to 5, characterized in that at a fixed illumination function by means of a second short-term interruption of the power supply of the temporally constant illumination function in a time-varying illumination function is switchable.

7. Lighting device (1) according to one of claims 1 to 6, characterized in that the lighting device device comprises at least one preferably short-term energy storage (8), in particular a capacitor (8).

8. Lighting device according to one of claims 1 to 7, characterized in that the lighting device comprises at least one microprocessor (5).

9. Lighting device according to one of claims 1 to 8, characterized in that after a prolonged interruption of the power supply, the present before the interruption of the power supply lighting function is recoverable.

10. Method for operating a lighting device

(1) with at least one temporally variable lighting function, characterized in that by means of a brief operation of an external operating element, in particular a switch for interrupting the power supply, the lighting function is influenced.

11. Method for operating a lighting device

(1) according to claim 10, characterized in that the time-varying illumination function comprises a temporally successive radiation of light having at least two different wavelengths.

12. A method for operating a lighting device (1) according to claim 10 or 11, characterized in that the time-varying illumination function comprises a temporally successive emission of light having at least two different intensities.

13. A method for operating a lighting device (1) according to any one of claims 10 to 12, characterized in that the time-varying illumination function comprises a temporally successive emission of white light having at least two different color temperatures.

14. Method for operating a lighting device (1) according to one of claims 10 to 13, characterized indicates that the lighting function is switched by means of the temporary interruption of the power supply of a time-varying lighting function in a temporally constant lighting function.