FI82583C - ANORDNING FOER STYRNING AV BELYSNINGSARMATUR. - Google Patents

Description

82583

The present invention comprises a device for controlling luminaires, in particular indoor lighting systems, of the type described in the preamble of claim 1.

With such a control unit, an individual luminaire or group of luminaires can be dimmed or switched off completely when daylight / sunlight is able to maintain the necessary lighting in the part of the room in question. Such action has a favorable effect on the indoor climate, especially when the outdoor temperature is high. Turning off light sources can mean direct savings in energy costs and can, in many cases, reduce maintenance costs.

To achieve this, it was previously necessary to use a local or centralized control unit that turned the lights on or off or dimmed the luminaire or luminaire group at the reference point based on the illumination measurement on the photocell. The same thing could also be done with the Wed 1 log switch. (This is described for LUXSTAT in the following publications: Elektro-E lektro-teknis k Tidsskrift 91, no.7, April 1 1, 1 978, p.

12-15; Lampetten, No. 3, 1977; Notika A / S Bulletins, 25 DK-9400 Norresundby.) In addition, there are manual remote control devices in which the switching off or on or dimming of luminaires or light groups is based on the transmission of control signals by infrared rays. (One such device is disclosed in Siemens Elektrodienst 30 26, Heft 3, 1984, p. 23.) Such devices are also used in connection with the above-mentioned automatic control units, for example Philips Technical Information "Light": "Integrated Function Systems".

2 82583

Known automatic control systems use a single detector (photocell) which registers at a suitable reference point either the sum of daylight / sunlight and artificial light in a room or measures lighting outside 5 buildings.

In all rooms that have access to daylight, daylight lighting varies considerably in different parts of the room. Variation also occurs in time according to the position of the sun and in relation to the architecture of the room. 10 The need for additional room lighting varies depending on the location and time of day. It is therefore difficult to find a reference point that is sufficiently representative of the lighting of the whole room.

Another problem is that the need for lighting 15 in different workstations in the room may be different.

A disadvantage of the existing technical solutions for automatic lighting control is also the need to install separate control signal lines or to create separate power supplies for the luminaires. This means either significant costs for new equipment or significant equipment costs for old systems.

: The main object of the present invention is to provide a device which makes it possible to control a single luminaire in such a way that the control of this luminaire does not affect the corresponding control of other luminaires in the room, and thus prevents lighting instability.

The control unit of an individual device must be able to be individually calibrated according to the lighting needs in this part of the room.

This is possible by developing the device according to the characterizing part of claim 1.

The invention makes it possible to locally adjust the light sources in new or existing lighting systems by tying the cost symbols to the air to pull the control signal lines or to implement separate power sources for the lighting devices.

Other advantages of the invention are described in the dependent claims.

The invention is described in more detail in the following representation referring to the drawings 1 * 0: li 3 82583

Figure 1 shows by way of example the geometry of a ceiling-mounted luminaire and its straightnesses.

Figure 2 shows schematic characteristics of the various components of the light flux measurable in the working plane of Figure 1.

Figure 3 shows an outline of an electrical circuit diagram for a fluorescent lamp, the power supply of which takes place with a device according to the invention.

Figure 4 schematically shows the optical and electronic components of the device 10 according to the invention.

A fluorescent lamp 11 mounted on the ceiling to illuminate the desk 13 is shown in Fig. 1.

Power is supplied to the luminaire 11 by a device 14 developed in accordance with the invention to control the on / off switches. Details of the device are shown below. Only the optical system 15 with its detector 16, which captures light from the work area, will be described in this connection. The detector 16 is mounted inside a tubular shade 17 and an optical filter 18 is placed in front of the shade. The shade 20 limits the incident angle CX of the light entering the detector 16.

Figure 2 shows a time-dependent curve of the illumination of the area to be measured. The constant daylight / sunlight component Eq arrives from the window above the work area of Figure 1 (not shown in the figure). Additional illumination is obtained from the electric light, E ^ · This varies according to the electrical signal, i. at twice the frequency of 100 Hz with respect to the power supply, between E Amax and ^ Amin * The luminaire emits some light even when the electrical signal is zero. This is due to the slowness of the fluorescence method of the fluorescent lamp.

How the device according to the invention reacts to the total amount of light arriving at the detector 16 is described below.

Figure 3 shows the electrical components of the fluorescent lamp 11. The most important elements are the fluorescent tube 20 and 35, the igniter 21, the inductor 22 and the phase condenser aa11ori 23. These components are connected together and to the terminals 24 of the night line in a manner well known in the art.

The device according to the invention, hereinafter referred to by its reference number 14, comprises an electrical part 25, which U0 is connected in series between the electrical network and the fluorescent lamp 4 82583, and an optical part 15 with its detector 16.

Figure 4 shows an example of a light unit for switching on / off. It includes an electronic switch 27 connected in series between the electrical element 5 and the fluorescent lamp 11. The signals of the comparator circuit 28 control the electronic switch on and off. The signal to be compared comes from the detector 16 via the circuit 29. Circuit 29 will be described in more detail in connection with the description of the reference signal 1 controlled by potentiometer 30. The electronic circuit 29 includes an electronic filter, a delay circuit, and an amplifier. The operation of these parts is described in more detail below. The circuit is assembled from commonly available components according to known principles.

Figure 4 also shows in detail the implementation of the telescopic 15-shaped, tubular shade 17.

The shade is attached to the housing 31 on the outside at the detector 16. In the example, an optical filter 18 is attached to the inner end of the shade 17.

Through the housing 31, the device can be attached to an existing luminaire 20, connected as a stand-alone unit and / or concealed / recessed.

In order to implement the principle of the invention, it is necessary to measure light and process the signal thus obtained in one or more of the following ways: · The optical filter 18 must be designed to transmit light components from the spectral region where the internal light optical signal and the optical end signal, signal, the ratio is at its smallest. To take some example, this could mean that the filter transmits light near the infrared range.

2. Detector 16 can be made of a substance that is particularly sensitive in the above-mentioned spectral region. This also facilitates, mainly and above all, the measurement of the external light entering the measuring area 35.

3. The electronic circuit 29 includes components that calculate the end signal 1in, i. calculating the external va1 component Ep from the variation of illumination during the AC period, as shown in Fig. 2.

1 + 0 According to the invention, the control unit ti 5 82583 can be used to guarantee correct, individually set lighting in the lighting area of the luminaire. This is the case when no luminaires other than those needed to maintain proper lighting are in operation during this time.

5 The following is a more detailed description of signal processing in control circuit 29.

The signal from the detector's measuring range consists of a nearly constant part, which can be considered to be the day / sunlight component Eq, and a part, which can be considered to be the lighting component E1 caused by the electric light sources. This is shown in Figure 2.

The electronic signal can be amplified. Assuming that the eigenvalue of the ratio E ^ m £ n / E ^ max is known, the part can be filtered off and the remaining part E ^ min reduced to as small as possible, in principle it is completely removed. Thus, the remaining electrical signal contains information only about the component Ej) and the possible remainder of Ej. This signal is processed by the comparator s s a.

The delay of the amplifier circuit prevents the luminaire from being switched on / off due to occasional short-term lighting changes.

The resulting electrical signal is compared in a comparator to a manually determined level for suitable lighting and hysteresis. The level of hysteresis is set with potentiometer 25 32. Hysteresis means that the level of lighting that causes the luminaire to switch off is higher than the level that causes the luminaire to switch on. The hysteresis thus prevents the effect of switching on the control and the mutual instability of the individual lamp or lamps 30. The signal from the comparator circuit 28 turns the electronic switch on or off.

Compared to the example, the device according to the invention can be modified in different ways. The electronic switch 27 can be replaced by a circuit capable of controlling the lights steplessly or in steps of 35, for example with a phase-controlled triac transistor. In this way, even more precise lighting control can be realized.

The invention can be used in connection with individual luminaires. In principle, it can also be used in such a way that 1 + 0 that one control system controls the groups formed by two or more 6 82583 luminaires. In such a case, the device is placed centrally in the overall light field of the luminaires. For example, luminaires on a window wall can be adjusted separately and luminaires further away in a room can be adjusted separately.

The control system according to the invention can also be combined with the switching on / off of the lights with the IRT-1 transmitter. This has been previously discussed in the prior art images tae s s a.

Il

Claims (5)

7,82583 Claims: A device for controlling luminaires, in particular indoor luminaires (11), which is intended to be mounted above the illuminated area (13) and is provided with an electronic circuit (29) for controlling the luminaire, having a light detector (16) connected to the electronic circuit for controlling and a shade (17) placed in front of the detector, characterized in that the shade (17) is designed to limit the incoming light to the detector (16) so that the light comes from a suitable measuring range, and that there is a means allowing a signal proportional to the illumination of the illuminated area to light in the region of the light spectrum in which the ratio of the internal optical signal emitted by the light ai-15 of the lamp to the main optical signal caused by the external light, in particular daylight, is at a minimum. Device according to Claim 1, characterized in that an optical filter (18) is arranged in front of the detector (16), which primarily transmits light only in the region of the light spectrum in which the ratio of the internal optical signal to the main optical signal is at a minimum. 3. Claims! and 2, characterized in that the detector (16) is made of a material with a high sensitivity in the region of the light spectrum in which the ratio of the internal optical signal to the main optical signal is at its lowest. Device according to Claims 1 to 3, characterized in that its electronic circuit (29) is arranged to calculate the main signal corresponding to the main optical signal on the basis of the variation in illumination measured during the alternating current period and to use the signal as a basis for luminaire control. Device according to claims 1 to 4, characterized in that the electronic circuit (29) comprises a hysteresis function for comparing the main signal with the reference ignore, and a potentiometer with which the degree of hysteresis can be varied. 8 82583