DE2747173B2 - Emergency light with luminous flux control - Google Patents

Description

The invention relates to a luminous flux control that automatically switches on if the mains voltage fails Illuminant powered by an Aki jmulator lights up.

Practice has shown that the time domain is direct after a mains voltage failure is often decisive for the outbreak of panic and the one that comes with it associated risk to persons. In particular, the relative fall in light also plays an important role Role. Due to the high change in luminance in the event of a power failure, visual performance is reduced by the slow Adaptation of the eye (dark adaptation) is significantly reduced because the Steep drop in the adaptation and the pin adaptation takes place.

Solutions have already become known in which, in order to reduce the risk of panic, the The lighting level for emergency lighting is projected to be higher. While after the z. Currently applicable Regulation VDE 0108 for the installation of emergency lighting Requires a minimum illuminance of 1 lux, then values of 5 or 10 lux projected. This fact also reflects the fact that according to the same rule z. B. a minimum illuminance level for stages in theaters of 5 lux is required. For the installation of emergency lighting in industrial companies, according to the Workplace ordinance according to DIN 5035 even emergency lighting for various areas of application required, which 10% of the lighting level of general lighting must reach. l: s hai yourself however, it has been shown that the minimum burning time of 1 or 3 hours, which is also specified, increases of the emergency lighting level beyond the minimum requirement almost proportionally to the system costs, in particular due to the accumulator and the charger, increased, which is very often not justifiable.

There are also already versions of an emergency lighting system after the central battery system according to the German patent DE-PS 7 22 616 known in which in the event of a power failure in addition to the emergency lighting circuit, which is switched to the battery Panic lighting is switched on. The disadvantage of this version is as with the one mentioned above Possible solutions are that the investment costs for the increased lighting level that can be achieved increase proportionally, with such emergency lighting systems usually being planned in this way in the practice are that the lighting level of emergency lighting and panic lighting together the according to the applicable regulations of VDE 0108 result in required illuminance values.

The invention has therefore set itself the task of creating a lighting system which the previously does not have listed disadvantages and shortcomings of the previously known embodiments. It should be at As little effort as possible, the safety requirement for as high a level as possible and in terms of time meet optimal lighting level.

This object is achieved in that, according to the invention, emergency lights according to the individual battery system directly after the power failure by a time control the luminaire for a predetermined time, which is essential is less than the nominal burning time, operated with increased power / -, and then becomes automatic on the nominal power according to the

jo design of the accumulator based on the nominal Burn time downshifts.

This light upshift causes ζ. Tie 3 or 4 times the lighting level is made available for the first 5 minutes after the power failure.

without the battery and the internal charger having to be enlarged or significantly enlarged, because with a tripling of the power during the first 5 minutes with a nominal burning time of Lamp of 3 hours only an increase of the battery by approx. 5% is necessary. Here appears a light switch-up time of /. B. 5 minutes as sufficient as is known. that in an emergency, small and medium-sized buildings are usually within this time can be evacuated. The significantly higher lighting level offers here thanks to the better visibility of escape routes and possible obstacles such as steps, stair headings, etc. considerable advantages.

On the basis of FIG. I and 2, which show block diagrams of the lamp according to the invention, the Invention will be described in more detail.

F i g. I shows an emergency light (9), which consists of the charger (1), the battery (2), the emergency / network switchover (3) and the lamp (4) consists, according to the invention an additional lamp (6) is switched on by the time control (5) for a predetermined time. When using incandescent lamps as illuminants, the illuminants (4) and (6) can also become one Two-filament incandescent lamp can be summarized.

F i g. 2 shows a further development of the subject matter of the invention, with emergency lighting versions with a fluorescent lamp (8) the time-limited increase in luminous flux by the intervention of the time control (5) in the inverter (7) ζ. Β. by changing the current limit he follows. This solution is very interesting for practical use, since it is common to have such To operate fluorescent lamp emergency luminaires with 30 or 40% of the nominal power with mains operation. Here the lamp is then within the first

Operated for 5 minutes with 100% luminous flux.

In another further development of the subject matter of the invention, the luminous flux in the case of emergency lamp designs with fluorescent lamp not abruptly discontinued after the upshift time has elapsed, but steplessly. In this case, the reduction takes place, for example, within a further 5 minutes, which results in an even better one Adaptation of the eye to the lighting level results.

The lights with the features according to the invention thus combine the following advantages. Without that Increasing the size of the battery at all or significantly can be possible in the first 5 or 10 minutes after the power failure, which are usually decisive for a possible outbreak of panic, e.g. B. 3 times the luminous flux available be asked. Due to the resulting lower change in luminance in the event of a power failure! will also a higher visual performance through faster adaptation of the eyes (dark adaptation - within the first 5 minutes, the steep decline of the adaptation and the spigot adaptation take place). Especially in the workplace (Makeshift lighting), where, according to DIN 5035, 10% of the normal illuminance is often waived A long burning time is required in order to be able to carry out important work to the end, this represents temporary increase in luminous flux is an extremely economical solution.

1 sheet of drawings

Claims (4)

Patent claims: 1. Emergency luminaire based on the self-contained system with luminous flux control, in the event of failure of the Mains voltage automatically lights up a lamp powered by an accumulator, thereby characterized that immediately after the power failure, the emergency light (9) by a time control (5) for a specified time, which is significantly less than the nominal burning time increased power is operated and then automatically to the nominal power accordingly the design of the accumulator (2) downshifts based on the nominal burning time. 2. Emergency light according to claim 1, characterized in that that the temporary increase in luminous flux by switching on an additional Lamp (6) takes place. 3. Emergency light according to claim 1, characterized in that the temporary increase in luminous flux be> Emergency lights with fluorescent lamp (8) by intervening in the inverter circuit (7) takes place. 4. Emergency light according to claims 1 to 3, characterized in that the lowering of the temporary increase in luminous flux does not take place in steps but steplessly.