JP2009205850A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device providing a high circuit efficiency in either normal time or at emergency time. <P>SOLUTION: The illumination device is equipped with a light source 1 formed by connecting a plurality of light-emitting diodes LED in series, a regularly used lighting circuit 2 in which an AC voltage from a commercial power supply AC is rectified and smoothed, and the rectified and smoothed DC voltage is supplied to the light source 1, a chargeable emergency power supply BT, an emergency lighting circuit 3 in which a DC voltage from an emergency power supply BT is boosted during power failure to be supplied to the light source 1, a step-down circuit 4 in which the AC voltage from the commercial power supply AC is stepped down and converted to the DC voltage, and a charging circuit 5 in which the emergency power supply BT is charged by an output voltage from the step-down circuit 4. In this illumination device, output ends of the regularly used lighting circuit 2 are connected to both ends of a first light-emitting part 10 formed by connecting all the light-emitting diodes LED, and the output ends of the emergency lighting circuit 3 are connected to both ends of a second light-emitting part 11 formed by connecting a prescribed number of the light-emitting diodes LED which is smaller than that of the light-emitting diodes LED of the first light-emitting part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting device that supplies lighting power to a light source by an emergency power source during a power failure.

  Conventionally, an emergency lighting device such as a guide light for guiding an evacuee to a safe place in the event of an emergency such as a fire is known. For example, there is one disclosed in Patent Document 1. The illuminating device described in Patent Document 1 includes a rectifying / smoothing circuit that rectifies and smoothes an alternating voltage from a commercial power supply, and a first direct-current voltage that is a low voltage by stepping down the output voltage from the rectifying and smoothing circuit. A step-down circuit that outputs a low DC voltage and a second DC voltage that is greater than the first DC voltage, and an emergency power supply that is charged to output a DC voltage substantially equal to the second DC voltage. A battery, a charging circuit that charges the battery with a second DC voltage output from the step-down circuit, and a first DC voltage from the step-down circuit or a DC voltage from the battery is converted into a high-frequency voltage and supplied to the discharge lamp. Control for controlling the inverter circuit and the first DC voltage from the step-down circuit to be supplied to the discharge lamp at the normal time, and controlling the DC voltage from the battery to be supplied to the discharge lamp at the time of a power failure And a stage.

In addition, lighting devices that employ light-emitting diodes as light sources instead of discharge lamps are known, such as those disclosed in Patent Document 2 and Patent Document 3, for example. In such an illuminating device, since the light emitting diode as a light source is turned on by supplying a DC voltage, an inverter circuit is not necessary.
Japanese Patent Laid-Open No. 2003-257665 JP 2006-286339 A JP 2006-269408 A

  By the way, the power supply voltage for turning on the light source of the lighting device as described above is a high AC voltage of 100 to 200 V of the commercial power supply in a normal time, whereas a low DC voltage of about several V of the emergency power supply at the time of a power failure. Voltage. However, in the ones described in Patent Document 2 and Patent Document 3, since the same light source is turned on by two power supplies having different voltages as described above, a step-down circuit for obtaining a DC low voltage from a commercial power supply And a step-up circuit for obtaining a predetermined DC voltage from the emergency power supply is required, and there is a problem that it is difficult to realize downsizing and high efficiency of the lighting device.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an illuminating device capable of obtaining high circuit efficiency in both normal and emergency situations.

  In order to achieve the above object, a light source comprising a plurality of light emitting elements connected in series and a regular lighting circuit for rectifying an AC voltage from a commercial power supply and supplying the rectified DC voltage to the light source An emergency power supply that can be recharged, a step-down circuit that steps down the AC voltage from the commercial power supply and converts it into a DC voltage, a charging circuit that charges the emergency power supply using the output voltage from the step-down circuit, and an emergency during a power outage And an emergency lighting circuit that boosts a DC voltage from the power supply and supplies the light source to the light source, and the normal lighting circuit has an output terminal connected to both ends of the first light emitting unit to which all light emitting elements of the light source are connected. The emergency lighting circuit is characterized in that its output end is connected to both ends of the second light emitting unit to which a predetermined number of light emitting elements fewer than the light emitting elements of the first light emitting unit are connected.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the light emitting elements of the light source are arranged substantially linearly, and at least the light emitting elements of the second light emitting section are arranged at a predetermined interval from each other. And

  In order to achieve the above object, a third aspect of the present invention provides a light source composed of a plurality of light emitting units each having a plurality of light emitting elements connected in series, and a direct current that rectifies and rectifies an AC voltage from a commercial power source. A normal lighting circuit that supplies voltage to the light source, an emergency power supply that can be charged, a step-down circuit that steps down the AC voltage from the commercial power supply and converts it to a DC voltage, and an output voltage from the step-down circuit It has a charging circuit for charging and an emergency lighting circuit that boosts the DC voltage from the emergency power supply and supplies it to the light source in the event of a power failure, and each output terminal of the regular lighting circuit and the emergency lighting circuit is the input of the light source The switching circuit is connected between the terminals, normally connects a plurality of light emitting units in series between the input terminals, and connects a plurality of light emitting units in parallel between the input terminals in the event of a power failure.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the switching circuit normally connects all the light emitting units in series between the input terminals.

  According to the first aspect of the present invention, since the output terminal of the regular lighting circuit is connected to both ends of the first light emitting unit in which all the light emitting elements of the light source are connected in series during normal operation, The potential difference from the voltage across the first light emitting unit is small, and high circuit efficiency can be obtained. Furthermore, since both ends of the emergency lighting circuit are connected to both ends of the second light emitting section in which only a predetermined number of light emitting elements fewer than the light emitting elements of the first light emitting section are connected in series at the time of a power failure, compared with the normal time Thus, the necessary supply voltage to the light source is reduced, the step-up ratio of the DC voltage of the emergency power supply can be kept low, and high circuit efficiency can be obtained.

  According to the invention of claim 2, the light from the light emitting element is irradiated by arranging the light emitting elements of the second light emitting section that are lit at both normal times and power outages at a predetermined interval. Predetermined luminance can be obtained while reducing luminance unevenness on the display surface.

  According to the invention of claim 3, the output voltage from the normal lighting circuit is supplied between the input terminals in which the plurality of light emitting units are connected in series at the normal time, and between the input terminals in which the plurality of light emitting units are connected in parallel at the time of a power failure. Since the output voltage from the emergency lighting circuit is supplied, the supply voltage to the light source that is required in the event of a power failure becomes smaller than during normal times, and the boost ratio of the DC voltage of the emergency power supply can be kept low. High circuit efficiency can be obtained. Furthermore, since all the light emitting elements are turned on during both normal times and power outages, there is no difference in luminance unevenness on the display surface irradiated with light from the light emitting elements, and the display surface can always emit light uniformly.

  According to the invention of claim 4, since the output voltage from the regular lighting circuit is supplied between the input terminals in which all the light emitting units are connected in series at the normal time, the DC voltage obtained by rectifying the commercial power supply and the voltage across the light source The potential difference is small, and high circuit efficiency can be obtained.

(Embodiment 1)
Hereinafter, Embodiment 1 of the lighting device according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the present embodiment rectifies and smoothes an AC voltage from a light source 1 in which a plurality of (in the figure, six) light emitting diodes LED, which are light emitting diodes LED connected in series, and a commercial power supply AC. A normal lighting circuit 2 that supplies a smoothed DC voltage to the light source 1, an emergency power supply BT that can be charged, and an emergency lighting circuit 3 that boosts the DC voltage from the emergency power supply BT and supplies it to the light source 1 in the event of a power failure And a step-down circuit 4 that steps down the AC voltage from the commercial power source AC and converts it to a DC voltage, and a charging circuit 5 that charges the emergency power source BT by the output voltage from the step-down circuit 4.

  The light emitting diode LED of the light source 1 uses a white light emitting diode that is a combination of a blue LED chip having a short wavelength and a phosphor that converts blue light from the LED chip into white. In addition, although white is suitable as the luminescent color of light emitting diode LED, it is not limited to the said structure and luminescent color, You may use the light emitting diode of another luminescent color.

  The light source 1 includes three input terminals IN1 to IN3 to which output voltages from the regular lighting circuit 2 and the emergency lighting circuit 3 are input. The input terminal IN1 is connected to the high-voltage side output terminal of the regular lighting circuit 2. The input terminal IN2 is connected to the output terminal on the high voltage side of the emergency lighting circuit 3, and the input terminal IN3 is connected to the output terminal on the low voltage side of both the lighting circuits 2 and 3. The input terminal IN1 is connected to the high voltage side of the light source 1, the input terminal IN3 is connected to the low voltage side of the light source 1, and the input terminal IN2 is connected to the intermediate point of the light emitting diodes LED connected in series with the light source 1. . In the following description, the set of all the light emitting diodes LED connected between the input terminals IN1 and IN3 is the light emission of the first light emitting unit 10 and the first light emitting unit 10 connected between the input terminals IN2 and IN3. A set of a predetermined number (three in this case) of light emitting diodes LED, which is smaller than that of the diode LED, is referred to as a second light emitting unit 11.

  The regular lighting circuit 2 includes a rectifier circuit 20 including a diode bridge that rectifies an AC voltage from the commercial power supply AC, a smoothing capacitor C1 that smoothes the pulsating voltage Vr from the rectifier circuit 20, and a backflow prevention diode D2. And a smoothing circuit 21. The DC output voltage V1 output from the smoothing circuit 21 is supplied to the first light emitting unit 10 of the light source 1 by being input between the input terminals IN1 and IN3.

  The emergency power supply BT is formed of a secondary battery such as a nickel / cadmium battery, a nickel metal hydride battery, or a lithium ion battery, for example, and a DC voltage is applied to the second light emitting unit 11 via a booster circuit 30 of an emergency lighting circuit 3 to be described later. Supply. In the present embodiment, the secondary battery is adopted as the emergency power source BT. However, the battery is not limited to the secondary battery as long as it can be charged. For example, an electric storage element such as an electric double layer capacitor is used. It doesn't matter.

  The emergency lighting circuit 3 includes a booster circuit 30 that boosts the DC output voltage Vbt of the emergency power supply BT, and a smoothing circuit 31 that includes a diode D3 and a smoothing capacitor C2 that smoothes the output voltage V2 from the booster circuit 30. Composed. Since the circuit configuration of the booster circuit 30 is well known, detailed description thereof is omitted here. Although not shown, the booster circuit 30 includes a relay for turning on / off the connection between the input terminal and the emergency power supply BT, and the relay is normally energized by the charging circuit 5 described later. . For this reason, the emergency power supply BT and the booster circuit 40 are not connected in a normal state. The DC voltage output from the smoothing circuit 31 is supplied to the second light emitting unit 11 of the light source 1 by being input between the input terminals IN2 and IN3.

  Here, current limiting resistors R1 and R2 are provided between the output terminal on the high voltage side of the normal lighting circuit 2 and the input terminal IN1, and between the output terminal on the high voltage side of the emergency lighting circuit 3 and the input terminal IN2, respectively. Is inserted, and the currents flowing through the light emitting units 10 and 11 are appropriately set by the current limiting resistors R1 and R2. In this embodiment, the current limiting resistors R1 and R2 are provided as current limiting elements. However, as shown in FIG. 2, for example, the regular lighting circuit 2 and the emergency lighting circuit 3 are used instead of the current limiting resistors R1 and R2. The constant current control circuit 6 may be provided between the output terminal on the low voltage side and the input terminal IN3.

  The step-down circuit 4 includes a diode D1 and a smoothing capacitor C3, a transformer T, a control circuit 40, a snubber circuit 41, and a rectifying and smoothing circuit 42. Specifically, the primary winding Ta of the transformer T and the control circuit 40 are connected in series between both ends of the smoothing capacitor C3 connected to the high-voltage side output terminal of the regular lighting circuit 2 via the diode D1, and the secondary winding. A series circuit of a diode D5 and a smoothing capacitor C4 constituting a rectifying / smoothing circuit 42, and a series circuit of a Zener diode ZD and a photodiode PD of a photocoupler PC are connected between both ends of the line Tb. The snubber circuit 41 includes a parallel circuit of a capacitor C5 and a resistor R3 and a diode D4 connected in series to the parallel circuit, and is connected between both ends of the primary winding Ta of the transformer T. The control circuit 40 incorporates a switching element such as a field effect transistor (not shown) and a driver for controlling on / off of the switching element, and is connected to a phototransistor PTr of the photocoupler PC.

  Hereinafter, the operation of the step-down circuit 4 will be described. When the switching element of the control circuit 40 is turned on / off according to the on / off of the phototransistor PTr, the DC voltage smoothed by the diode D1 and the smoothing capacitor C3 is converted into a high frequency voltage. This high frequency voltage is stepped down by the secondary winding Tb of the transformer T and smoothed by the rectifying and smoothing circuit 42. In the rectifying and smoothing circuit 42, when the voltage across the smoothing capacitor C4 rises above a predetermined voltage, the Zener diode ZD conducts and the photodiode PD emits light. When the voltage falls below the predetermined voltage, the Zener diode ZD does not conduct and the photo diode The diode PD stops emitting light. The phototransistor PTr is turned on / off by the blinking of the photodiode PD, and the voltage across the smoothing capacitor C4, that is, the output voltage from the step-down circuit 4 is controlled to a predetermined voltage and supplied to the charging circuit 5. Further, the snubber circuit 41 absorbs a kick voltage generated between both ends of the primary winding Ta of the transformer T in accordance with on / off of the switching element of the control circuit 40. In the present embodiment, the flyback converter insulated by the transformer T as described above is employed as the step-down circuit 4, but the circuit configuration is not particularly limited, and is a non-insulated type that does not use the transformer T. A circuit may be employed.

  The charging circuit 5 normally charges the emergency power source BT by supplying the output voltage from the step-down circuit 4 to the emergency power source BT, and energizes the relay of the booster circuit 4 by the output voltage. When the commercial power supply AC fails, the output voltage from the step-down circuit 4 is not supplied, so the charging of the emergency power supply BT is stopped and the relay of the step-up circuit 4 is turned on to connect the step-up circuit 30 and the emergency power supply BT. . Since the circuit configuration of the charging circuit 5 is well known, detailed description thereof is omitted here. In the present embodiment, the power failure of the commercial power supply AC is determined based on whether or not the output voltage from the step-down circuit 4 is supplied to the charging circuit 5, but the determination method is not limited to this method. .

  Hereinafter, the operation of this embodiment will be described. In a normal time when the commercial power supply AC is energized, an alternating voltage from the commercial power supply AC is converted into a direct current voltage and supplied to the first light emitting unit 10 of the light source 1, and the light emitting diode LED of the first light emitting unit 10 is turned on. Emits light. At the same time, the pulsating voltage Vr from the rectifier circuit 20 is converted into a predetermined DC voltage by the step-down circuit 4 and supplied to the charging circuit 5 to charge the emergency power supply BT. When the commercial power supply AC fails, the voltage is not supplied from the regular lighting circuit 2 to the first light emitting unit 10, and the light emitting diode LED of the first light emitting unit 10 is turned off. At the same time, since the emergency power supply BT and the booster circuit 30 of the emergency lighting circuit 3 are connected by the charging circuit 5, the DC voltage from the emergency power supply BT is boosted and smoothed in the emergency lighting circuit 3, and the light source 1 Is supplied to the second light emitting unit 11 and the light emitting diode LED of the second light emitting unit 11 emits light.

  Next, a specific example will be described. In the following description, the forward voltage of one light-emitting diode LED is about 4 V, and the forward current is about 30 mA in both normal and power outages. When the number of the light emitting diodes LED of the first light emitting unit 10 is 24 and the number of the light emitting diodes LED of the second light emitting unit 11 is 12, the voltage between both ends of the first light emitting unit 10 is about 96V, and the second light emitting unit 11 Is about 48V, and the light output of the light source 1 at the time of a power failure is 50% of the light output of the light source 1 at the normal time. If the resistance values of the current limiting resistors R1 and R2 are both 1.47 kΩ, the voltage across the resistors R1 and R2 is about 44 V, and therefore the required output voltage V1 of the regular lighting circuit 2 and the emergency lighting circuit are required. 3 output voltages V2 are about 140V and about 92V, respectively.

  Here, assuming that the emergency lighting circuit 3 supplies a voltage to the first light emitting unit 10 in the same manner as the regular lighting circuit 2, the required output voltage V2 of the emergency lighting circuit 3 is about 140 V, and the booster circuit The step-up ratio at 30 becomes large. In general, when the boosting ratio of the booster circuit 30 is increased, conversion is performed due to a decrease in coupling between a primary winding and a secondary winding of a transformer (not shown) or an increase in copper loss of a choke coil (not shown). Efficiency is reduced. On the other hand, in this embodiment, the emergency lighting circuit 3 is connected to the second light emitting unit 11 to reduce the required output voltage V2 and to keep the boosting ratio of the booster circuit 30 low. The circuit efficiency at the time can be improved and the power consumption can be reduced. Further, since the power consumption can be reduced, the capacity of the emergency power supply BT can be reduced, and as a result, the lighting device can be reduced in size and weight.

  In the normal state, the output terminal of the normal lighting circuit 2 is connected to both ends of the first light emitting unit 10 in which all the light emitting diodes LED of the light source 1 are connected in series. And the voltage across the first light emitting unit 10 can be reduced, and high circuit efficiency can be obtained. Further, since the potential difference can be reduced, a step-down circuit is not required, and as a result, the lighting device can be reduced in size and weight.

  Hereinafter, another specific example will be described. When the number of the light emitting diodes LED of the first light emitting unit 10 is 24 and the number of the light emitting diodes LED of the second light emitting unit 11 is 8, the voltage between both ends of the first light emitting unit 10 is about 96V, and the second light emitting unit 11 Is about 32 V, and the light output of the light source 1 at the time of a power failure is about 33% of the light output of the light source 1 at the normal time. Here, the required output voltage V1 of the regular lighting circuit 2 and the required output voltage V2 of the emergency lighting circuit 3 are about 140 V and about 76 V, respectively, but the resistance value of the current limiting resistor R2 is set to the value of the current limiting resistor R1. When set to 400Ω smaller than the resistance value, the voltage across the current limiting resistor R2 is about 12V, and the required output voltage V2 of the emergency lighting circuit 3 is reduced to 44V. Therefore, the boosting ratio of the booster circuit 30 can be further reduced as compared with the above-described specific example, so that the circuit efficiency can be further improved.

  By the way, as shown in FIG. 3, in the case where 24 light emitting diodes LED of the light source 1 are arranged substantially linearly and irradiated from the long rectangular display unit 7 made of a translucent member, the second light emitting unit. It is desirable to arrange 11 light emitting diodes LED at predetermined intervals. That is, the eight light emitting diodes LED of the second light emitting unit 11 that emits light only at the time of power failure are evenly arranged, and the first light emitting unit 10 that emits light during both normal time and power failure between the light emitting diodes LED. By disposing 16 light emitting diodes LED, a predetermined luminance can be obtained while reducing luminance unevenness on the display surface irradiated with light from the light emitting diode LED.

(Embodiment 2)
Hereinafter, Embodiment 2 of the lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, as shown in FIG. 4, a plurality (two in the drawing) of the first (first and second) light emitting diodes 10 each including a plurality (three in the drawing) of light emitting diodes LED connected in series. 11, and the output terminals of the normal lighting circuit 2 and the emergency lighting circuit 3 are both connected between the input terminals of the light source 1, and the first light emitting unit 10 and the second light emitting unit 10 are normally connected. The light emitting unit 11 is connected in series between the input terminals, and a switching circuit 8 is provided for connecting the first light emitting unit 10 and the second light emitting unit 11 in parallel between the input terminals in the event of a power failure. Note that the first light emitting unit 10 and the second light emitting unit 11 of the light source 1 are connected in parallel to the output terminals of the regular lighting circuit 2 and the emergency lighting circuit 3, so that the regular lighting circuit 2 and the emergency lighting circuit 3 A current limiting resistor R <b> 1 is inserted between the output terminal on the high voltage side and the input terminal of the light source 1.

  The switching circuit 8 includes a relay SW <b> 1 connected between the high-voltage side output terminals of the normal lighting circuit 2 and the emergency lighting circuit 3 and the anode-side terminal of the first light emitting unit 10, and the second light emitting unit 11. The relay SW2 is connected between the cathode side terminal of the LED and the output terminal on the low voltage side of the normal lighting circuit 2 and the emergency lighting circuit 3. The relay SW1 is configured to be able to switch a path between a and b and a path between a and c, and the relay SW2 is configured to be able to switch a path between dh and a path between df. The switching of the relays SW1 and SW2 is controlled by the output voltage from the step-down circuit 4 supplied to the charging circuit 5.

  Hereinafter, the operation of this embodiment will be described. In the normal time when the commercial power source AC is energized, in the switching circuit 8, the relay SW1 closes the path between ab and the relay SW2 closes the path between de, so the first light emitting unit 10 and the second light emitting unit 10 Are directly connected. For this reason, the AC voltage from the commercial power supply AC is converted into a DC voltage and supplied to all the light emitting diodes LED of the light source 1 to emit light. At the same time, the pulsating voltage Vr from the rectifier circuit 20 is converted into a predetermined DC voltage by the step-down circuit 4 and supplied to the charging circuit 5 to charge the emergency power supply BT. When the commercial power supply AC fails, in the switching circuit 8, the relay SW1 closes the path between ac and the relay SW2 closes the path between df, so the first light emitting unit 10 and the second light emitting unit 11 Connected in parallel. At the same time, since the emergency power supply BT and the booster circuit 30 of the emergency lighting circuit 3 are connected by the charging circuit 5, the DC voltage from the emergency power supply BT is boosted and smoothed in the emergency lighting circuit 3, and the light source 1 Are supplied to all the light emitting diodes LED to emit light.

  Here, since the first light emitting unit 10 and the second light emitting unit 11 are connected in parallel at the time of a power failure, the supply voltage necessary for causing the light source 1 to emit light with the same light output as that in the normal time is approximately the same as that in the normal time. It becomes half. Further, since the light source 1 emits light with a light output lower than that in the normal state at the time of a power failure, the necessary supply voltage is further reduced. Therefore, as in the first embodiment, by suppressing the boosting ratio of the booster circuit 30 to be low, the circuit efficiency at the time of a power failure can be improved and the power consumption can be reduced. Further, since the power consumption can be reduced, the capacity of the emergency power supply BT can be reduced, and as a result, the lighting device can be reduced in size and weight. In the normal state, since the output terminal of the normal lighting circuit 2 is connected to both ends of the light source 1 in which all the light emitting diodes LED are connected in series, the output voltage V1 of the normal lighting circuit 2 and the voltage between both ends of the light source 1 are connected. Can be reduced, and high circuit efficiency can be obtained. Further, since the potential difference can be reduced, a step-down circuit is not required, and as a result, the lighting device can be reduced in size and weight.

  In this embodiment, the switching circuit 8 is configured using relays SW1 and SW2 that are contacted elements. For example, as illustrated in FIG. 5, the switching circuit 8 is configured using transistors Tr1 and Tr2 that are contactless elements. It doesn't matter.

  Further, the number of light-emitting diodes LED of the light source 1 is not necessarily limited to the number of the first and second embodiments, and is appropriately set to the number capable of obtaining a light output required as a lighting device during normal times and power outages. Good.

  Further, the output voltage V1 of the regular lighting circuit 2 does not necessarily need to be smoothed, and the smoothing capacitor C1 may be omitted as shown in FIG. However, in this case, a smoothing capacitor C6 may be added between the output terminals of the illumination pressure circuit 30 of the emergency lighting circuit 3.

  By the way, the object of the present invention is to make the voltage across the light source 1 as high as possible during normal times and as low as possible during a power failure, so that the output voltage V1 from the regular lighting circuit 2 and the light source 1 during normal times. The potential difference between the two terminals is reduced, and in the event of a power failure, the boost ratio of the booster circuit 30 is reduced to increase the efficiency of each circuit. Therefore, for example, in the case of a lighting device having a relatively small display surface such as a guide light, the number of light emitting diodes LED may be about 20, and in this case, each of the above embodiments is optimal. On the other hand, when the area of the display surface is increased and the number of light emitting diodes LED is required to be 30 or more, the voltage between both ends of the light source 1 when all the light emitting diodes LED are connected in series becomes too large, and the regular lighting is performed. There is a risk that stable voltage supply by the circuit 2 may be difficult. In such a case, the light source 1 may be configured by connecting a plurality of series circuits of light emitting diodes LED in parallel.

It is a circuit diagram which shows Embodiment 1 of the illuminating device which concerns on this invention. It is a circuit diagram which shows the other circuit structure same as the above. It is a top view which shows arrangement | positioning of the light emitting diode in a light source same as the above. It is a circuit diagram which shows Embodiment 2 of the illuminating device which concerns on this invention. It is a circuit diagram which shows the other circuit structure same as the above. It is the circuit diagram which a part of which showed another circuit structure same as the above was abbreviate | omitted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 10 1st light emission part 11 2nd light emission part 2 Normal lighting circuit 3 Emergency lighting circuit 4 Voltage-down converter 5 Charging circuit LED Light emitting diode (light emitting element)
AC commercial power supply BT Emergency power supply

Claims (4)

  A light source comprising a plurality of light emitting elements connected in series, a regular lighting circuit that rectifies an AC voltage from a commercial power source and supplies the rectified DC voltage to the light source, an emergency power source that can be charged, and a commercial power source A step-down circuit that steps down the AC voltage and converts it to a DC voltage, a charging circuit that charges the emergency power supply using the output voltage from the step-down circuit, and an emergency power supply that boosts the DC voltage from the emergency power supply during a power failure A lighting circuit, and an output terminal of the normal lighting circuit is connected to both ends of the first light emitting unit to which all light emitting elements of the light source are connected, and an output terminal of the emergency lighting circuit has a first output terminal. An illumination device, wherein the lighting device is connected to both ends of a second light emitting unit to which a predetermined number of light emitting elements fewer than the light emitting elements of the light emitting unit are connected.   The illuminating device according to claim 1, wherein the light emitting elements of the light source are arranged substantially linearly, and at least the light emitting elements of the second light emitting unit are arranged at a predetermined interval from each other.   A light source composed of a plurality of light emitting units each having a plurality of light emitting elements connected in series, a regular lighting circuit that rectifies an AC voltage from a commercial power supply and supplies the rectified DC voltage to the light source, and can be charged. An emergency power supply, a step-down circuit that steps down the AC voltage from the commercial power supply and converts it to a DC voltage, a charging circuit that charges the emergency power supply using the output voltage from the step-down circuit, and a DC voltage from the emergency power supply during a power failure An emergency lighting circuit that boosts and supplies the light to the light source, and the output terminals of the normal lighting circuit and the emergency lighting circuit are both connected between the input terminals of the light source, and normally, a plurality of light emitting units are input terminals. A lighting device comprising a switching circuit for connecting a plurality of light emitting units in parallel between input terminals in the event of a power failure.   4. The lighting device according to claim 3, wherein the switching circuit normally connects all the light emitting units in series between the input terminals.

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