JP2007234323A - Emergency lighting system and emergency lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency lighting device and an emergency lighting fixture capable of satisfying a specified lighting time and optical output even under a strict ambient temperature, by restraining temperature rise through reduction of supply current to a light-emitting diode with a given optical output secured. <P>SOLUTION: In an emergency, power is fed from a battery 16, and a plurality of light-emitting diodes 18, 19 are lighted one after another controlled by a control device 26. Therefore, one specific piece of light-emitting diode is put off before its temperature rises, for instance, before it reaches a saturation temperature, and that, goes on radiating heat till its next lighting timing. With this. the light-emitting diodes keep on outputting a given level of light, while temeprature rise is controlled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an emergency lighting apparatus that employs a light emitting diode as a light source in an emergency, and an emergency lighting apparatus using the emergency lighting apparatus.

Patent Document 1 proposes an emergency lighting fixture that employs a light emitting diode as a light source.
JP 2004-179048 A

  The emergency lighting fixture described in Patent Document 1 is provided with a light control lens so as to cover the entire light emitting region of the light emitting diode, and by controlling the light distribution using the refractive action of the light control lens, It is intended to save electricity by increasing utilization efficiency.

  Although the thing of patent document 1 does not touch on the problem of the temperature rise of a light emitting diode, when a temperature rises, it is known that a lifetime will deteriorate or a light output and a luminescent color will fluctuate if a temperature rises. . For this purpose, various heat radiating means have been proposed.

  However, it is stipulated that emergency lighting fixtures can operate even in harsh environments with an ambient temperature of 140 ° C. At the same time, at least at the time of a power failure, for example, the minimum illuminance and lighting time are defined such that the floor illuminance is 1 lx or more and 30 minutes or more.

  Therefore, when a light emitting diode is adopted as a light source for an emergency lighting device, it is possible to suppress a temperature rise of the light emitting diode at least in an emergency and obtain a predetermined light output even in an environment of a specified ambient temperature. It is necessary to take measures.

  The present invention reduces the supply current to the light-emitting diode while obtaining a predetermined light output to suppress the temperature rise, and can satisfy the specified lighting time and light output even under severe ambient temperature. An object is to provide an emergency lighting device and an emergency lighting apparatus.

  The emergency lighting device according to claim 1 is a battery; a charging device that charges the battery by an output from a normal power source at all times; a plurality of light-emitting diodes that are lit by the output of the battery in an emergency of the normal power source; And a control device that monitors the state of the power supply and switches on and turns on a plurality of light emitting diodes at least in an emergency.

  In the first aspect of the present invention, the fact that the plurality of light emitting diodes are sequentially switched on at least in an emergency means that the lighting control contents of the light emitting diodes are not particularly limited. That is, the light source for constant use may or may not be provided, and even if it is provided, the lighting control content is not limited, and the case where the light-emitting diode is also used is allowed.

  In addition, the switching interval should be selected so that the next emitting diode is turned on before the temperature rise of one of the plurality of light emitting diodes is not saturated. Thereby, the temperature rise of each light emitting diode can be suppressed. It should be noted that the switching of lighting is preferably performed instantaneously so as not to give the user a feeling of blinking. Light-emitting diodes have excellent optical output followability with respect to the supply current, so it is possible to prevent flashing by instantaneous switching. The light emitting diode may be turned off.

  In addition, when there are three or more light emitting diodes, it may be switched so that one light emitting diode is sequentially turned on, or may be switched so that two or more light emitting diodes are turned on sequentially. Good.

  Further, in the invention described in claim 1 and the following invention, a plurality of light emitting diodes can be attached to a heat conductive substrate and heat can be radiated through the substrate. Further, a structure in which a substrate on which a light emitting diode is mounted is thermally coupled to a heat radiating body to radiate heat can be employed. In either case, since a plurality of light emitting diodes are dispersedly arranged with respect to the heat radiating body, heat dissipation is performed smoothly.

  According to the first aspect of the present invention, power is supplied from the battery in an emergency, and the plurality of light emitting diodes are sequentially turned on under the control of the control device. Therefore, when viewed from one light emitting diode, the light is turned off before the temperature rises, for example, before reaching the saturation temperature, and the heat is radiated before the next lighting timing. For this reason, the temperature rise is suppressed while the light emitting diode outputs predetermined light.

  The disaster prevention lighting device according to claim 2 includes: a battery; a charging device that charges the battery with an output from a normal power source at all times; a normal light-emitting diode that is always lit by an output from the normal power source; A plurality of emergency light emitting diodes to be lit; lighting control of the common light emitting diodes and the emergency light emitting diodes are performed according to the state of the normal power supply, and in an emergency, each of the plurality of emergency light emitting diodes is controlled. And a control device that reduces the amount of supplied power to less than the amount of supplied power per normal light emitting diode and increases the total amount of supplied power to the amount of supplied power to one common light emitting diode. .

  Also in the invention described in claim 2, the common light emitting diode may be used as the emergency light emitting diode, and the number thereof is not limited. In the case of a plurality, the supply power amount per unit and the total supply power amount are determined using the supply power amount per unit as a comparison target. That is, it is possible to reduce the individual power amount to suppress the heat generation amount and increase the total power amount to obtain a predetermined light output.

  The degree to which the amount of power supplied per emergency light emitting diode is less than the amount of power supplied per normal light emitting diode can be set to 70 to 80% or less or 50% or less, for example. In addition, the total amount of power supply can be set in consideration of the required predetermined light output.

  According to the second aspect of the present invention, each of the plurality of emergency light emitting diodes is turned on with relatively little power in an emergency. For this reason, there is little calorific value per emergency light emitting diode, and even if it is a usual heat dissipation means, sufficient heat dissipation is possible. Further, since the total amount of supplied power is larger than one regular light emitting diode, it is possible to obtain a higher illuminance than usual.

  The emergency lighting fixture according to claim 3 comprises a lighting fixture body; and the emergency lighting device according to claim 1 or 2 provided on the lighting fixture body.

  According to the first aspect of the present invention, the plurality of light emitting diodes are sequentially switched and turned on in an emergency, thereby reducing the heat generation of the light emitting diodes while suppressing the temperature rise while obtaining a predetermined light output in an emergency. A lighting device can be provided.

  According to the second aspect of the present invention, the amount of power supplied per emergency light emitting diode is relatively small, and the total amount of power supplied is increased, thereby emitting light while obtaining a predetermined light output in an emergency. It is possible to provide an emergency lighting device that suppresses the temperature rise by reducing the heat generation of the diode.

  According to invention of Claim 3, the emergency lighting fixture which has an effect similar to the invention of Claim 1 or 21 can be provided.

  Hereinafter, an embodiment of an emergency lighting device according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a circuit diagram showing an embodiment of an emergency lighting device according to the present invention, and FIG. 2 is a view showing a waveform of a current supplied to a light emitting diode.

  The output of the commercial power supply as the regular power supply 1 is input to the rectifying flat 3 via the high frequency cut filter 2. The output of the rectifier 3 is smoothed by the smoothing capacitor 4, and the smoothed DC voltage is input to the high-frequency converter 5. Although details and illustration of the high-frequency converter 5 are omitted, a flyback having an output transformer 6 and an oscillating unit 7 as main components and generating a high-frequency AC voltage in the output transformer 6 based on the high-frequency oscillation of the oscillating unit 7 Form an inverter. As the oscillator 7, for example, a power IC “TNY264” manufactured by POWER INTEGRATIONS can be used. The first output winding 6-2 of the output transformer 6 is converted into a smoothed DC voltage by the rectifying and smoothing circuit 8, and as a regular light source through the diode 9, the transistor 10 as a switching element, and the current limiting resistor 11. The light emitting diode 12 can be supplied. Although one light emitting diode 12 is illustrated, a plurality of light emitting diodes 12 may be provided.

  The output of the other output winding 6-3 is converted into a smoothed DC voltage by the rectifying and smoothing circuit 13, and can be supplied to the battery 16 via the diode 14 and the current limiting resistor 15. That is, the output winding 6-3, the rectifying / smoothing circuit 13, the diode 14 and the current limiting resistor 15 form a charging device 17.

  The battery 16 serves as an illumination power supply in place of the regular power supply 1 in an emergency, and enables the light emitting diodes 18 and 19 as emergency light sources to be lit. The light emitting diode 18 is provided with a transistor 20 for lighting control in series, and the light emitting diode 19 is provided with a transistor 21 for lighting control in series. The resistors 22 and 23 are current limiting resistors. The series circuit of the light emitting diode 18, the transistor 20 and the current limiting resistor 22 and the series circuit of the light emitting diode 19, the transistor 21 and the current limiting resistor 23 are parallel to each other, and the transistor 10, the current limiting resistor 11 and It is also connected in parallel to a series circuit of light emitting diodes 12 as a regular light source.

  A boosting and lighting control circuit 24 and a diode 25 are provided between the battery 16 and the light emitting diodes 18 and 19. The boosting and lighting control circuit 24 boosts, for example, the output voltage of the battery 16 to an appropriate value or makes it a constant current. The diode 25 is for backflow prevention. The winding 6-1 is an input winding of the output transformer 7.

  A control device 26 for controlling the lighting of the light emitting diodes 12, 18 and 19 is provided in association with the rectifier 3 and the light emitting diodes 12, 18 and 19. That is, a power supply monitoring device 27 is provided between the output terminals of the rectifying device 3 to monitor the state of the regular power supply 1. And when the voltage more than a predetermined value is output from the regular power source 1, it determines with it being always, and when the voltage falls out of a predetermined value, it determines with an emergency.

  A lighting switching device 28 that switches the lighting state of the light emitting diodes 12, 18, and 19 in response to a determination signal from the power supply monitoring device 27 can control the transistors 10, 20, 21 and the boosting / lighting control circuit 24. Is provided. That is, the transistor 10 is provided with a transistor 29 for controlling on / off of the transistor 10, and the lighting switching device 28 can control on / off of the transistor 29. The transistors 20 and 21 are provided with transistors 30 and 31 for controlling on / off of the transistors 20 and 21, and the lighting switching device 28 can control on / off of the transistors 30 and 31. In this embodiment, a continuous on signal is supplied to the transistor 29 only at all times, and an on / off signal is alternately supplied to the transistors 30 and 31 only in an emergency. In addition, the lighting switching device 28 controls the boosting and lighting control circuit 24 so that it always does not operate and operates in an emergency.

  The resistor connected in series to the base of each transistor is for current limiting, and the diode 32 connected to the positive side of the battery 16 is for supplying power to the lighting switching device 28.

  Next, the operation of this embodiment will be described. Since the power supply monitoring device 27 outputs a determination signal indicating that the normal power supply 1 is always active, the lighting switching device 28 supplies an ON signal to the transistor 29 and an OFF signal to the transistors 30 and 31, respectively. . As a result, only the transistor 10 is turned on, so that a predetermined current set in advance is supplied to the light emitting diode 12 (a in FIG. 2A). On the other hand, the lighting switching device 28 is controlled to be inactive, and the battery 16 is charged by the charging device 17.

  In the event of an emergency such as a power failure of the utility power supply 1, the power supply monitoring device 27 outputs a determination signal indicating an emergency. Therefore, the lighting switching device 28 supplies an off signal to the transistor 29 to turn off the transistor 10. The light emitting diode 12 is turned off.

  The lighting switching device 28 operates the boosting and lighting control circuit 24 and supplies an on / off signal to the transistors 30 and 31 alternately. Therefore, the transistors 20 and 21 are also turned on alternately, and the light-emitting diodes 18 and 19 are supplied with currents B and B in FIG. 2B, respectively. As a result, the light emitting diodes 18 and 19 that are turned on in an emergency are turned on alternately, and the temperature rise is significantly reduced as compared with the case of continuous lighting. It should be noted that the peak values of the currents (b in FIG. 2A, b in FIG. 2B, c in c) are the same, or b and h> Easy to get output.

  Another embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a circuit diagram showing another embodiment of the emergency lighting device according to the present invention, FIG. 4 is a diagram showing a waveform of a current supplied to the light emitting diode, and FIG. 5 is a front view showing an example of mounting the light emitting diode on the substrate. is there. In FIG. 3, the same or corresponding parts as in FIG.

  In the present embodiment, the common light emitting diode is also used as an emergency light emitting diode, and a total of four emergency light emitting diodes are provided. That is, a series circuit of the light emitting diode 32, the transistor 33 and the current limiting resistor 34 is further connected in parallel to the series circuit of the light emitting diode 18, the transistor 20 and the current limiting resistor 22. The transistor 33 is also provided with a control transistor 35 like the other transistors 30 and 31, and the transistor 35 is controlled by the lighting switching device 28.

  1 is greatly different from that of FIG. 1 in the event of an emergency, the four emergency light-emitting diodes 12, 18, 19 and 32 are not sequentially switched and lit, but are continuously lit at a predetermined current value. That is. The predetermined current value is smaller than the lighting current of the light emitting diode 12 at all times, and the total power of the four emergency light emitting diodes 12, 18, 19, and 32 is larger than the lighting power of the light emitting diode 12 at all times. It is a value that increases.

  Next, the operation of this embodiment will be described. Since the power supply monitoring device 27 outputs a determination signal indicating that the normal power source 1 is always active, the lighting switching device 28 turns on only the transistor 29. Accordingly, the transistor 10 is turned on, and the light emitting diode 12 is supplied with the current d shown in FIG. During this time, the battery 16 is charged by the charging device 17.

  In the event of an emergency, the power monitoring device 27 outputs an emergency determination signal, so that the lighting switching device 28 operates the boosting and lighting control circuit 24 and sends on signals to the transistors 29, 30, 31 and 35. Supply. As a result, the transistors 10, 20, 21 and 33 are also turned on, and the light-emitting diodes 12, 18, 19 and 32 are supplied with the currents shown in FIGS. In the present embodiment, the current limiting resistors 11, 22, 23 and 34 are set to the same value, and the current hoch values are set to the same value. However, it may be varied as required.

  The light emitting diodes 12, 18, 19 and 32 as described above can be mounted as shown in FIG. 5, for example. In FIG. 5, reference numeral 50 denotes a substrate in which an electric circuit is printed on a metal substrate such as aluminum via an insulating layer, and four light emitting diodes 51 to 54 are mounted on the substrate 50. The four light emitting diodes 51 to 54 are configured such that light emitting elements 51a to 54a are arranged at the center bottom portions, and these light emitting elements 51a to 54a are covered with a lens or the like (not shown).

  In the above embodiment, since the current value in an emergency is small, the heat generation of each light emitting diode light emitting element 51 to 54 is small. Furthermore, since each of the light emitting diodes 51 to 54 is distributed on the substrate 50, the heat generated from each of the light emitting elements 51a to 54a is dissipated from the substrate 50 where it is mounted and the substrate 50 in the vicinity thereof, thereby suppressing the temperature rise. To do.

  Next, an embodiment of an emergency lighting apparatus according to the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing an embodiment of an emergency lighting apparatus according to the present invention. In the case of FIG. 6, the ceiling-mounted emergency lighting fixture is shown. Reference numeral 60 denotes a luminaire main body, 61 denotes an irradiation opening formed in the luminaire main body 60, and 62 denotes a drawstring for operating a switch for inspection. The luminaire main body 60 incorporates an emergency lighting device, and a light emitting diode (not shown) is provided so as to be able to emit light from the irradiation opening 61.

  The emergency lighting fixture having such a configuration can operate in an environment where the ambient temperature is high by suppressing the temperature rise of the light emitting diode, and illuminates the irradiated surface with a required illuminance in an emergency. It becomes possible.

The circuit diagram which shows one Embodiment of the emergency lighting apparatus by this invention The figure which similarly shows the supply current waveform to the light emitting diode The circuit diagram which shows other embodiment of the emergency lighting apparatus by this invention The figure which similarly shows the supply current waveform to the light emitting diode Front view showing an example of mounting a light emitting diode on a substrate The perspective view which shows one Embodiment of the emergency lighting fixture by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Common power source, 12, 18, 19, 32, 51-54 ... Light emitting diode, 16 ... Battery, 17 ... Charging apparatus, 26 ... Control apparatus, 60 ... Lighting fixture main body.

Claims (3)

With a battery;
A charging device that charges the battery at all times with the output from the utility power source;
A plurality of light emitting diodes that are lit by the output of the battery in the event of an emergency power supply;
A control device that monitors the state of the utility power supply and switches on and turns on a plurality of light emitting diodes at least in an emergency;
An emergency lighting device comprising: With a battery;
A charging device that charges the battery at all times with the output from the utility power source;
A regular light emitting diode that is always lit by the output of the regular power supply;
A plurality of emergency light emitting diodes that are lit by the output of the battery in an emergency;
The lighting control of the normal light emitting diode and the emergency light emitting diode is performed according to the state of the normal power supply, and the supply power amount per one of the plurality of emergency light emitting diodes is supplied per one normal light emitting diode in an emergency. A control device that is less than the amount of power and that makes the total amount of power supplied greater than the total amount of power supplied to the regular light emitting diode;
An emergency lighting device comprising: A lighting fixture body;
The emergency lighting device according to claim 1 or 2 provided on a lighting fixture body;
An emergency lighting fixture characterized by comprising:

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