JP5123094B2 - Emergency lighting device and emergency lighting equipment - Google Patents

Description

  The present invention relates to an emergency lighting device and an emergency lighting device that turn on a light source with an emergency power source when a power failure occurs in a normal power source.

  Emergency lighting fixtures to be installed in buildings, etc., are configured so that the light source is turned on only during a power failure (hereinafter referred to as an emergency) of a commercial power supply, etc. In some cases, the light source is configured to be turned on both when energized (hereinafter referred to as normal time) and in an emergency. In general, the former uses an incandescent bulb as a light source, and the latter uses a discharge lamp as a light source.

  As shown in FIG. 12, an emergency lighting device 1 used for the latter emergency lighting apparatus includes a normal lighting circuit 4a that receives power from a commercial power source AC as a normal power source and lights a light source L during normal operation. An emergency lighting circuit 4b that sometimes supplies power from the emergency power source 3 to turn on the light source L is monitored, the energization state from the commercial power source AC is monitored, and the light source L is turned on by the regular lighting circuit 4a according to the monitoring result The switching means 19 is configured to switch between the normal lighting to be performed and the emergency lighting in which the light source L is turned on by the emergency lighting circuit 4b. Moreover, in this kind of emergency lighting device 1, as shown in FIG. 13, one lighting circuit 4 is commonly used for both normal and emergency.

  On the other hand, as a general lighting fixture that uses a discharge lamp as a light source, a lighting circuit that can turn on the light source and control the power supplied to the light source, and a timing that counts the power supply time to this lighting circuit as the cumulative lighting time of the light source Unit (cumulative lighting time timer) and illuminance correction means for instructing the lighting circuit to supply power to the light source according to the cumulative lighting time measured by the time measuring unit, and the light of the light source accompanying the increase in the cumulative lighting time There has been proposed one that corrects power supplied to a light source (hereinafter referred to as initial illuminance correction) so as to suppress a decrease in output (see, for example, Patent Document 1). This type of lighting fixture suppresses the power supplied to the light source at the beginning of lighting of the light source, and increases the power supplied to the light source as the cumulative lighting time increases. Suppress changes in light output.

Incidentally, an emergency lighting device 1 that employs the above-described technique for correcting the initial illuminance has also been proposed (see, for example, Patent Document 2). The emergency lighting device 1 described in Patent Literature 2 is configured to measure the accumulated lighting time of the light source L without distinguishing between normal time and emergency time, and to perform initial illuminance correction, and at the initial lighting time of the light source L. Since the power supplied to the light source L is suppressed, low power consumption can be achieved through the normal time and the emergency time when the light source L is turned on. Furthermore, there is an advantage that the output of the emergency power supply (battery) 3 in an emergency can be suppressed at the initial lighting of the light source L, and the deterioration of the emergency power supply 3 can be suppressed.
Japanese Patent No. 3809747 JP 2007-172921 A

  However, when the emergency lighting device 1 is actually used, the emergency time in which the commercial power source AC is out of power with respect to the cumulative lighting time of the light source L is a short time. In the invention described in Patent Document 2, the light source Although there is a temporary effect in preventing deterioration of the emergency power source 3 at the time of discharge (that is, in an emergency) at the beginning of lighting of L, the emergency power source at the time of charging (that is, normal time) that greatly affects the life of the emergency power source 3 Almost no effect can be expected to prevent deterioration of the power source 3.

  The present invention has been made in view of the above-described reasons, and aims to reduce the power consumption during normal and emergency, and to extend the life of the emergency power supply by suppressing the deterioration of the emergency power supply during charging. It is an object of the present invention to provide an emergency lighting device and an emergency lighting apparatus capable of performing the above.

  According to the first aspect of the present invention, the lighting circuit that lights the light source using the normal power supply as a power source when the external normal power supply is energized, and the emergency power supply that is chargeable / dischargeable and that supplies the power to the lighting circuit when the normal power supply fails A charging circuit that charges the emergency power supply by supplying a charging current to the emergency power supply using the normal power supply, a timer unit that measures the cumulative lighting time of the light source, and the light output of the light source as the cumulative lighting time increases The dimming control unit performs initial illuminance correction to increase the power supplied from the lighting circuit to the light source as the cumulative lighting time increases, and the emergency power supply is charged for a predetermined time from the start of charging. And a charge control unit that performs charge output correction that changes the output of the charging circuit in accordance with the cumulative lighting time so that the amount of electricity to be increased increases with an increase in the cumulative lighting time.

  According to this configuration, the dimming control unit increases the power supplied from the lighting circuit to the light source as the cumulative lighting time increases so as to suppress a decrease in the light output of the light source accompanying an increase in the cumulative lighting time. Since the initial illuminance correction is performed, by suppressing the power supplied to the light source in the early stage of lighting of the light source, low power consumption can be achieved through the normal time and emergency in the early stage of lighting of the light source. In addition, the charging control unit changes the output of the charging circuit in accordance with the cumulative lighting time so that the amount of electricity charged to the emergency power source in a predetermined time from the start of charging increases with the increase in the cumulative lighting time. Since output correction is performed, the amount of electricity charged to the emergency power supply in a predetermined time can be suppressed to a low level at the beginning of lighting of the light source, and the life of the emergency power supply can be extended by suppressing the deterioration of the emergency power supply. it can.

  According to a second aspect of the present invention, in the first aspect of the invention, the charging circuit trickle-charges the emergency power source, and the charging control unit supplies power supplied by the initial illuminance correction with respect to an increase in the cumulative lighting time. It is characterized in that the magnitude of the charging current is changed so as to have the same rate of change as the change.

  According to this configuration, since the charging circuit trickle-charges the emergency power supply, it is possible to prevent a reduction in the amount of electricity due to self-discharge of the emergency power supply. In addition, since the charge control unit changes the magnitude of the charging current so as to have the same rate of change as the change in the supplied power due to the initial illumination correction with respect to the increase in the cumulative lighting time, the charging current accompanying the increase in the cumulative lighting time There is no need to calculate the rate of change separately from the initial illuminance correction, and there is an advantage that processing for charge output correction is simplified.

  According to a third aspect of the present invention, in the first aspect of the invention, the charging circuit performs trickle charging after the emergency power supply is rapidly charged over a predetermined rapid charging time, and the charging control unit is configured to The charge output correction is performed by controlling at least one of the magnitude of the charging current, the length of the quick charging time, and the magnitude of the charging current during trickle charging.

  According to this configuration, since the charging circuit performs trickle charging after rapidly charging the emergency power supply, the emergency power supply can be charged with a desired amount of electricity in a shorter time than when performing only trickle charging. The decrease in the amount of electricity due to the self-discharge of the power supply can be suppressed by trickle charging. Even in this charging method, the charge control unit controls at least one of the magnitude of the charging current at the time of quick charging, the length of the quick charging time, and the magnitude of the charging current at the time of trickle charging. Charging output correction can be performed.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, after the charging circuit rapidly charges the emergency power source over a predetermined rapid charging time, a charging period in which a charging current flows and a pause in which no charging current flows The charging control unit performs intermittent charging by periodically repeating the period, and the charging control unit determines the magnitude of the charging current during the quick charging, the length of the quick charging time, the magnitude of the charging current during the intermittent charging, and the period of the intermittent charging. The charge output correction is performed by controlling at least one of the following.

  According to this configuration, the charging circuit intermittently charges after the emergency power supply is rapidly charged, so that it is possible to charge the emergency power supply with a desired amount of electricity in a relatively short time, while the electric power generated by the self-discharge of the emergency power supply. A decrease in the amount can be suppressed by intermittent charging. Further, even in this charging method, the charge control unit is at least one of the magnitude of the charging current at the time of quick charging, the length of the quick charging time, the magnitude of the charging current at the time of intermittent charging, and the cycle of the intermittent charging. The charge output can be corrected by controlling one.

  The invention according to claim 5 is characterized in that the emergency lighting device according to any one of claims 1 to 4 and the light source are incorporated in an instrument body.

  According to this configuration, since the dimming control unit performs the initial illuminance correction, a constant light output is taken out from the instrument body even when a light source that tends to cause a decrease in light output due to an increase in cumulative lighting time is used. It becomes possible. In addition, the charging controller corrects the charging output, so that the deterioration of the emergency power supply can be suppressed and the life of the emergency power supply can be extended. Can do.

  In the present invention, the dimming control unit performs initial illuminance correction, so that power consumption can be reduced through normal and emergency in the initial lighting of the light source, and the charge control unit performs charge output correction. Thus, at the initial lighting of the light source, by suppressing the amount of electricity charged to the emergency power supply in a predetermined time, it is possible to suppress the deterioration of the emergency power supply and extend the life of the emergency power supply. is there.

(Embodiment 1)
As shown in FIG. 1, the emergency lighting device 1 of the present embodiment includes a power supply circuit 2 that rectifies, smoothes, and steps down the commercial power supply AC when power is supplied from the commercial power supply AC as a normal power supply (hereinafter referred to as normal time). Power supply from either the emergency power source 3 that can be charged / discharged and functions as a power source in the event of a power failure of the commercial power source AC (hereinafter referred to as an emergency), and the power circuit 2 or the emergency power source 3 And a lighting circuit 4 for lighting the light source L. Further, the emergency lighting device 1 includes a charging circuit 5 for charging the emergency power supply 3, a control means 6 for controlling the lighting circuit 4 and the output of the charging circuit 5, a power failure detection means 7 and a switching means described later. Is equipped. Here, a cold cathode fluorescent lamp is employed as the light source L.

  The lighting circuit 4 is composed of an inverter circuit that turns on the light source L by converting a DC voltage into an AC voltage and applying it to the light source L. Normally, the light source L is supplied with the DC voltage from the power supply circuit 2 as a power source. In an emergency, the light source L is turned on using a DC voltage from the emergency power supply 3 as a power source.

  Here, the energization state from the commercial power supply AC is monitored by the power failure detection means 7 that monitors the output of the power supply circuit 2. Then, switching between normal lighting using the commercial power supply AC and emergency lighting using the emergency power supply 3 is performed by switching the switch element S1 inserted between the power supply circuit 2 and the lighting circuit 4 and the emergency power supply 3-lighting. This is performed by switching means comprising a switch element S2 inserted between the circuits 4. That is, normally, the switch element S1 is turned on and the switch element S2 is turned off, and power is supplied from the commercial power supply (power supply circuit 2) AC to the lighting circuit 4 so that the light source L is normally lit. On the other hand, when a power failure of the commercial power supply AC is detected by the power failure detection means 7 (emergency), the switch element S1 is turned off and the switch element S2 is turned on to supply power from the emergency power supply 3 to the lighting circuit 4. The light source L is turned on in an emergency.

  The charging circuit 5 is configured to charge the emergency power supply 3 by receiving a power supply from the power supply circuit 2 and flowing a charging current to the emergency power supply 3 in a normal state. Here, a secondary battery (battery) such as a nickel cadmium battery or a nickel metal hydride battery is used as the emergency power source 3, but it is not particularly limited to a secondary battery as long as charging and discharging are possible. It may be like an electric double layer capacitor.

  The control means 6 measures the cumulative value of the power supply time to the lighting circuit 4 as the cumulative lighting time of the light source L, and the dimming that controls the light output of the light source L by controlling the output of the lighting circuit 4. A control unit 9 and a charge control unit 10 that controls the output of the charging circuit 5 are provided. Here, the time measuring unit 8 measures the accumulated lighting time without distinguishing between the normal time and the emergency time.

  The dimming control unit 9 corrects the power supplied to the light source L according to the accumulated lighting time measured by the time measuring unit 8 so as to suppress the decrease in the light output of the light source L accompanying the increase in the accumulated lighting time ( Hereinafter, initial illuminance correction is performed. The charging control unit 10 corrects the output of the charging circuit 5 (hereinafter referred to as charging output correction) so as to be interlocked with the initial illuminance correction according to the cumulative lighting time measured by the time measuring unit 8. Details of the initial illuminance correction and the charge output correction will be described later.

  By the way, as a typical emergency lighting apparatus using the emergency lighting device 1 of the present embodiment, there is a guide light that is required to be installed in a building or the like by the Fire Service Act. The guide lamp includes a display board 12 (see FIG. 11) on which a predetermined pattern is drawn, and transmits light from the light source L to the display board 12 to shine the surface of the display board 12 (hereinafter referred to as a display surface). Configured as follows. Here, a standard value of the average luminance of the display surface is determined by the industry association for each guide light grade and pattern, and the light output of the light source L is set so as to satisfy the standard value. FIG. 2 shows the standard value of the emergency lighting fixture A (see FIG. 11) constituting the escape exit guide light as an example. In this example, the standard value of the average luminance on the display surface is different between the normal time and the emergency time. ing. In both normal and emergency situations, both the upper limit and lower limit are specified, and even if they are below the lower limit (that is, too dark) or above the upper limit, Since the standard is not satisfied (that is, it is too bright), it is necessary to set the light output of the light source L to an appropriate value.

  The adjustment of the light output (luminance) is performed by controlling the output of the lighting circuit 4 by the dimming control unit 9 of the control means 6 shown in FIG. When the light output of the light source L is changed between the normal time and the emergency time (for example, in the case of Class A or Class B BH in FIG. 2), a predetermined light output is obtained in each of the normal time and the emergency time. The dimming control unit 9 performs dimming control so that

  Hereinafter, the initial illuminance correction will be described with reference to FIGS. In these drawings, the above-described class C evacuation exit guide light is taken as an example, but the numerical values shown in the drawings are merely examples, and are not intended to limit the application of the present invention.

First, as a reference example, FIG. 3 shows the normal display surface average luminance when the initial illuminance correction is not performed. In FIG. 3, the horizontal axis represents the cumulative lighting time of the light source L, and the vertical axis represents the display surface average luminance. That is, since the light output of the light source L gradually decreases as the cumulative lighting time thereof increases, the display surface average luminance gradually decreases as shown in FIG. 3 as the cumulative lighting time of the light source L increases. . Note that FIG. 3 shows an example in which the display surface average brightness decreases to 80% of the initial value when the cumulative lighting time reaches the rated life of the light source L (60,000 in this case). lighting start immediately after, by the ordinary upper side of the 250 cd / ^{m 2} output design of the lighting circuit 4 as obtained for 150~300cd / ^{m 2} which is a standard value at the rated lifetime of the light source L Even when the average luminance is reduced to 80% of the initial value at the time of arrival, 200 cd / m ² within the above standard value is obtained.

Moreover, the standard value of the emergency of the display surface average luminance in class C emergency exit light because a 100~300cd / ^{m 2,} by setting the initial value of the same 250 cd / ^{m 2} and normal even in an emergency Thus, even when the average luminance is reduced to 80% of the initial value when the rated life of the light source L is reached, it can be kept within the standard value (200 cd / m ² ). Note that the emergency light output ratio with respect to the normal time is not limited to this example, and the light output of the light source L for each of the normal time and the emergency time so as to satisfy the display surface average luminance shown in FIG. What is necessary is just to set suitably.

  Here, in the present embodiment, the dimming control unit 9 performs the above-described initial illuminance correction so that the light source L is not fully lit (rated lighting) at the beginning of lighting of the light source L as shown in FIG. Dimming is performed, and then the power supplied to the light source L is increased so that the dimming ratio gradually increases as the cumulative lighting time increases. Thereby, the light output of the light source L can be kept substantially constant from the beginning of lighting to the end of the rated life of the light source L. In FIG. 4, the horizontal axis represents the cumulative lighting time of the light source L, and the vertical axis represents the output ratio (dimming ratio). That is, at the beginning of lighting, the lighting circuit 4 is controlled to an output of 80% corresponding to the luminance attenuation when the rated life is reached, and the initial illuminance correction is performed so as to be 100% when the rated life is reached. Since the initial illuminance correction is the same as that described in Patent Document 1 described above, detailed description thereof is omitted here.

  In the present embodiment, such initial illuminance correction is performed both in the normal time and in an emergency, and the display surface average brightness is set to the initial value regardless of the increase in the cumulative lighting time of the light source L as shown in FIG. Keep the value almost equal to the value. In FIG. 5, the horizontal axis represents the cumulative lighting time of the light source L, the vertical axis represents the display surface average brightness, the value before the initial illuminance correction is represented by a broken line, and the value after the initial illuminance correction is represented by a solid line. Therefore, at the beginning of lighting, power consumption is reduced during normal and emergency, and the output of the emergency power supply 3 is suppressed in an emergency to prevent the emergency power supply 3 from deteriorating, and the light source L can be used for a long time. Can be lit.

  By the way, for emergency lighting fixtures such as guide lights, the charge / discharge performance of the emergency power source 3 is defined by technical standards of the industrial association. For example, in the case of the guide light described above, it is necessary to turn on (emergency lighting) the light source L for 25 minutes or more by charging for 24 hours. In short, since the amount of electricity required for emergency lighting needs to be charged within a predetermined time from the start of charging, the magnitude of the charging current is set according to the magnitude of the discharging current.

  Here, by correcting the light output of the light source L in an emergency as shown in FIG. 4 by the above-described initial illuminance correction, the discharge current characteristics from the emergency power source 3 gradually from the initial lighting state as shown in FIG. Will increase. In FIG. 6, the horizontal axis represents the cumulative lighting time of the light source L, and the vertical axis represents the discharge current. That is, in the initial lighting of the light source L, the discharge current from the emergency power source 3 in an emergency can be kept low, and the amount of electricity required for emergency lighting is reduced. As a result, the amount of electricity charged in the emergency power source 3 in a predetermined time from the start of charging can be suppressed to an extent that the emergency power source 3 does not reach full charge at the beginning of lighting of the light source L. The charging current supplied to the power supply 3 can also be kept low at the beginning of lighting. Therefore, the charging control unit 10 performs the above-described charging output correction so that the charging current is kept low at the beginning of lighting as shown in FIG. 7, and then the charging current is increased as the cumulative lighting time increases.

  If the charging current of the emergency power supply 3 is kept low, self-heating of the emergency power supply 3 during charging can be suppressed. The temperature of the power supply 3 can be kept low. Here, it is known that secondary batteries such as nickel cadmium batteries and nickel metal hydride batteries used as the emergency power source 3 generally follow the Arrhenius law, and the temperature of the emergency power source 3 is 10 ° C. By lowering, the lifetime can be extended by about twice. That is, suppressing the charging current at the beginning of lighting by charging output correction leads to extending the life of the emergency power supply 3.

  In the present embodiment, trickle charging, which is common as a charging method for a backup power source such as the emergency power source 3, is used for charging the emergency power source 3. Trickle charging is a charging method in which a load (in this case, the lighting circuit 4) is disconnected from the emergency power supply 3 in a normal state and a small current is continuously supplied to the emergency power supply 3 as shown in FIG. is there. In FIG. 8, the horizontal axis represents the charging time of the emergency power supply 3, and the vertical axis represents the charging current. Here, the charging control unit 10 suppresses the charging current to be small (20 mA in the example of FIG. 8) at the beginning of lighting of the light source L, and sets the charging current to a predetermined value (24 mA in the example of FIG. 8) as the cumulative lighting time increases. Charge output correction to increase up to. That is, the charging current is from the initial lighting state of the light source L indicated by the solid line in FIG. 8 (with charging output correction) to a predetermined value indicated by the broken line according to the cumulative lighting time (without charging output correction). Correction control is performed so as to increase.

  Thus, in the example of FIG. 8, the amount of electricity stored in the emergency power supply 3 (corresponding to the area of the shaded portion in the figure) in a predetermined time (24 hours) from the start of charging, that is, the amount of electricity required for emergency lighting is The initial value of the light source L is 480 mAh (20 mA × 24 hours), which is a value that does not reach full charge, and increases to 576 mAh (24 mA × 24 hours) as the cumulative lighting time increases. To do. Here, the rate of change of the charging current with respect to the increase of the cumulative lighting time is the same rate of change as the rate of change of the output of the lighting circuit 4 due to the initial illuminance correction.

  Further, in the emergency lighting device 1 as a whole, in the initial lighting of the light source L, the power consumption of the lighting circuit 4 and the power supply circuit 2 is suppressed by the initial illumination correction, so that the temperature of each circuit is low. That is, since the ambient temperature of the emergency power supply 3 is kept low, the life of the emergency power supply 3 can be greatly extended by the synergistic effect with the self-heating suppression of the emergency power supply 3 described above.

  The light source L is not particularly limited to a cold cathode fluorescent lamp, as long as the light output is attenuated as the cumulative lighting time increases. For example, a hot cathode fluorescent lamp or an LED (light emitting diode) is used. It may be. In any case, if an illuminance correction curve (corresponding to FIG. 4) is set in accordance with the attenuation characteristic (corresponding to FIG. 3) of the light output accompanying the increase in the cumulative lighting time of the light source L, it is equivalent to the above-described example. An effect can be obtained.

(Embodiment 2)
The emergency lighting device 1 of the present embodiment is different from the emergency lighting device 1 of the first embodiment in the charging method of the emergency power supply 3 and the charging output correction method.

  In this embodiment, as shown in FIG. 9, a charging method that combines rapid charging and trickle charging is employed. In FIG. 9, the horizontal axis represents the charging time of the emergency power supply 3, and the vertical axis represents the charging current. In this charging method, when charging the same amount of electricity, the time from the start of charging to the completion of charging is shorter than when only trickle charging is performed, and the temperature of the emergency power supply 3 is kept low during trickle charging. There is an advantage that can be.

  In the example of FIG. 9, since the charging circuit 5 charges the emergency power supply 3 with the amount of electricity necessary for emergency lighting in a short time, a predetermined quick charging time from the start of charging is larger than that during trickle charging. A charging method (so-called step-wise charging mode) that operates in a rapid charging mode in which a trickle charging is performed after a rapid charging time elapses, and the trickle charging is performed with a minute current that only compensates for the remaining capacity decrease due to self-discharge of the emergency power supply 3. Another charging method). Here, in the example of FIG. 8 shown in the first embodiment, the amount of electricity necessary for emergency lighting (corresponding to the area of the hatched portion in the figure) is 480 mAh (20 mA × 24 hours) in the initial lighting of the light source L. 9, in order to obtain the same amount of electricity in half the charging time (12 hours), the charging current in the rapid charging mode is set to twice that in FIG. 8 (40 mA). Here, although the charging current in trickle charging after rapid charging is described as 5 mA, the appropriate charging current differs depending on the performance of the emergency power supply 3, so the value of the charging current is the specification of the emergency lighting device 1. It may be set as appropriate in accordance with.

  Here, the charge output correction content in the charging method of FIG. 9 may control the magnitude of the charging current during trickle charging as in the example of FIG. The length of the sheath charging time (that is, the length of the quick charging time) may be controlled. In FIG. 9, an initial lighting state of the light source L (state with charge output correction) is represented by a solid line, and any one of the above-described charging current and charging time is represented by a broken line according to the cumulative lighting time of the light source L. Correction control is performed so as to increase to a value (state without charge output correction). Here, according to the specification of the emergency lighting device 1, by selecting the best correction method that can keep the temperature of the emergency power supply 3 low, the life of the emergency power supply 3 is extended and the low power consumption ( Energy saving) can be achieved.

  Further, as another example of the present embodiment, as shown in FIG. 10, it is conceivable to adopt a charging method that combines rapid charging and intermittent charging. In FIG. 10, the horizontal axis represents the charging time of the emergency power supply 3, and the vertical axis represents the charging current. In this charging method, charging (complementary charging) to compensate for the remaining capacity drop due to self-discharge of the emergency power supply is not intermittent trickling charging, but intermittent charging scheme in which charging current is passed intermittently. Compared with the staged charging method combined with charging, the power consumption during the auxiliary charging can be kept low, and the temperature of the emergency power supply 3 can be kept low.

  In the example of FIG. 10, the charging circuit 5 operates in a rapid charging mode in which charging current is continuously supplied for a predetermined rapid charging time from the start of charging in order to charge the emergency power supply 3 in a short time. After the elapse of time, a charging method for shifting to an intermittent charging mode in which a charging current is intermittently supplied to compensate for the remaining capacity reduction due to self-discharge of the emergency power supply 3 is shown. That is, during the operation in the intermittent charging mode, the charging period in which the charging current is supplied to the emergency power source 3 and the pause period in which the charging current is not supplied are periodically repeated. In the case of the emergency power source 3 with little self-discharge, the amount of discharge electricity required in an emergency can be secured for a long time even if there is no period for trickle charging as in the examples of FIGS. Can do.

  The charge output correction content in the charging method of FIG. 10 may be such that the magnitude of the charging current and the length of the charging time (that is, the length of the quick charging time) in the quick charging mode may be controlled. You may make it control the magnitude | size of a charging current, the length of a charging period, and an intermittent period (that is, the period through which charging current flows). In FIG. 10, the initial lighting state of the light source L (state with charge output correction) is indicated by a solid line, and any one of the above-described charging current, charging time, and intermittent period is indicated by a broken line according to the cumulative lighting time. Correction control is performed so as to change to a value (state without charge output correction). Here, according to the specification of the emergency lighting device 1, by selecting the best correction method that can keep the temperature of the emergency power supply 3 low, the life of the emergency power supply 3 is extended and the low power consumption ( Energy saving) can be achieved.

  Other configurations and functions are the same as those of the first embodiment.

  By the way, the emergency lighting apparatus 1 shown in each of the above embodiments is incorporated in the fixture main body 11 together with the light source L as shown in FIG. 11, thereby guiding the emergency lighting fixture (here, the location of the blame exit of the building). Light) A. Below, the emergency lighting fixture A shown in FIG. 11 is demonstrated easily.

  This emergency lighting fixture A is a rectangular box-shaped fixture main body 11 with a front opening, a rectangular display plate 12 and a light incident on one end surface of the display plate 12 and guided to one side of the display plate 12. A display unit 13 having a rectangular light guide plate (not shown) attached to the front surface of the fixture body 11, and a light source (here, a straight tube type cold cathode fluorescent lamp) disposed opposite to the one end face of the light guide plate And a light source unit 15 having a lamp holder 14 for holding L and being attached to the instrument body 11 so as to cover the front surface of the instrument body 11 together with the display unit 13. A lighting block 16 including the power supply circuit 2 and the lighting circuit 4 constituting the emergency lighting device 1, the emergency power supply 3, and the terminal block 17 are accommodated between the appliance main body 11 and the display unit 13. . Furthermore, a connector 18 for electrically connecting the light source unit 15 is provided at the upper end of the instrument body 11. In this emergency lighting apparatus A, light from the light source L incident on the light guide plate is emitted forward from substantially the entire front surface of the light guide plate, so that the entire front surface (display surface) of the display plate 12 emits light uniformly. be able to.

It is a schematic circuit diagram which shows the structure of Embodiment 1 of this invention. It is explanatory drawing of the industry association standard of the display surface average brightness used for description same as the above. It is a graph which shows the display surface average brightness | luminance of a reference example same as the above. It is a graph which shows the output of the lighting circuit same as the above. It is a graph which shows a display surface average brightness | luminance same as the above. It is a graph which shows the discharge current of the emergency power supply same as the above. It is a graph which shows the charging current of the emergency power supply same as the above. It is explanatory drawing which shows a charging current same as the above. It is explanatory drawing which shows the charging current in Embodiment 2 of this invention. It is explanatory drawing which shows the charging current in the other example same as the above. It is a disassembled perspective view which shows the emergency lighting fixture of this invention. It is a schematic circuit diagram which shows a prior art example. It is a schematic circuit diagram which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Emergency lighting device 3 Emergency power supply 4 Lighting circuit 5 Charging circuit 8 Timekeeping part 9 Dimming control part 10 Charge control part 11 Instrument body A Emergency lighting equipment AC Commercial power supply (ordinary power supply)
L light source

Claims (5)

  A lighting circuit that turns on the light source using the normal power supply when the external normal power supply is energized, an emergency power supply that is chargeable / dischargeable and that supplies power to the lighting circuit in the event of a power failure, and an emergency power supply A charging circuit that charges the emergency power supply by supplying a charging current to the power supply, a timekeeping unit that measures the cumulative lighting time of the light source, and a cumulative so as to suppress a decrease in the light output of the light source as the cumulative lighting time increases A dimming controller that performs initial illuminance correction that increases the power supplied to the light source from the lighting circuit as the lighting time increases, and the amount of electricity that is charged to the emergency power supply in a predetermined time from the start of charging increases the cumulative lighting time An emergency lighting device comprising: a charge control unit that performs charge output correction for changing the output of the charging circuit in accordance with the cumulative lighting time so as to increase with increase of the charging time.   The charging circuit trickle-charges the emergency power supply, and the charging control unit has a charging current magnitude so that the rate of change is the same as the change in power supplied by the initial illumination correction with respect to the increase in the cumulative lighting time. The emergency lighting device according to claim 1, wherein:   The charging circuit performs trickle charging after the emergency power supply is rapidly charged over a predetermined rapid charging time, and the charging control unit is configured to determine the magnitude of the charging current during the rapid charging, the length of the rapid charging time, The emergency lighting device according to claim 1, wherein the charging output correction is performed by controlling at least one of the magnitudes of charging currents during charging.   The charging circuit performs intermittent charging by periodically repeating a charging period in which charging current flows and a pause period in which charging current does not flow after the emergency power supply is rapidly charged over a predetermined rapid charging time, The charge controller corrects the charge output by controlling at least one of the magnitude of the charging current at the time of quick charging, the length of the quick charging time, the magnitude of the charging current at the time of intermittent charging, and the cycle of the intermittent charging. The emergency lighting device according to claim 1, wherein: An emergency lighting apparatus comprising the main body of the emergency lighting device according to any one of claims 1 to 4 and the light source.

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