JP2014220064A - Led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting fixture capable of increasing lighting time by electric power of a power storage part as much as possible when power cut or the like occurs.SOLUTION: An LED lighting fixture comprises: a plurality of LEDs 8; and a power storage part charged in a state that electric power is supplied from an external commercial power supply. In the LED lighting fixture, the plurality of LEDs 8 is connected in series, the LEDs 8 emit light by electric power of the power storage part when power cut occurs, a part of the plurality of LEDs 8 is made to be short circuit and is turned off in accordance with lowering of output voltage of the power storage part, and only remaining LEDs 8 emit the light.

Description

  The present invention relates to an LED lighting device that normally receives power from an external commercial power source to cause an LED to emit light, and that in the event of a power failure, continues to emit the LED with electric power from a built-in power storage unit.

  Since lighting fixtures installed on indoor ceilings and the like are used for a long time, they use power supplied from an external commercial power source for light emission. Therefore, when the supply of power from the outside is stopped due to a power failure or the like, the light is turned off simultaneously with the stop of the power supply. However, if a power outage occurs at night or in a room with no windows, it becomes dark and cannot be seen around.

  Therefore, a power storage unit is provided inside, and power is stored in the power storage unit in a state where power is supplied from the outside. When power supply from the outside is stopped due to a power failure or the like during lighting, power is automatically stored in the power storage unit. There is known one in which illumination is continued by the generated power (see, for example, Patent Document 1).

JP 2012-28292 A (Claim 3, paragraph 0005)

  In the thing described in the above-mentioned conventional patent document 1, in addition to an incandescent bulb and a fluorescent lamp as an emission source, an LED is presented, but even an LED with the least power consumption among these emission sources, Since the power stored in the power storage unit is finite, if the state that was lit by the power from the external power supply is continued as it is, the power stored in the power storage unit is consumed rapidly and the power is turned on only for a short time. The trouble that it cannot continue occurs.

  Then, this invention makes it a subject to provide the LED lighting fixture which can lengthen the lighting time by the electric power of an electrical storage part as much as possible when a power failure etc. arise in view of said problem.

  In order to solve the above-described problems, an LED lighting apparatus according to the present invention is an LED lighting apparatus that emits an LED using electric power supplied from an external commercial power source, and has a power storage unit that is charged by electric power from the commercial power source. In the case of continuing the light emission of the LED by the power stored in the power storage unit at the time of a power failure, when the plurality of LEDs are connected in series and the LED is caused to emit light by the power of the power storage unit, the output voltage of the power storage unit is decreased. Accordingly, a light reduction circuit is provided in which a part of the plurality of LEDs is short-circuited to extinguish only the remaining LEDs.

  When power supply from the outside is stopped due to a power failure or the like, insufficient power is stored in the power storage unit. In this state, all the LEDs are turned on to ensure brightness, but the output voltage of the power storage unit decreases with power consumption. When the voltage drops to a certain extent, all the LEDs are turned off at the same time. Therefore, some LEDs are turned off to reduce the number of LEDs that are turned on. As a result, power consumption is reduced, so that lighting can be continued for a longer time than when all LEDs are lit. In addition, if the number of LEDs that are lit is gradually reduced, the eyes become accustomed, and thus visibility can be ensured as compared to when the lights are extinguished at once.

  The above configuration is particularly effective when the power storage unit is an electric double layer capacitor.

  As is clear from the above description, the present invention reduces the number of LEDs that are turned on as the output voltage of the power storage unit decreases when the LEDs are continuously turned on by the power stored in the power storage unit. Although the illuminance decreases, the time during which the LEDs are lit can be extended as much as possible.

The figure which shows the state of the LED lighting fixture embed | buried under the ceiling The perspective view which shows the shape of the whole LED lighting fixture Exploded perspective view of LED lighting fixture Block diagram of the circuit that operates during a power failure

  With reference to FIG. 1, 1 is the LED lighting fixture (henceforth a fixture) by this invention. The appliance 1 is embedded in the ceiling CL of the bathroom, and a plurality of LEDs (light emitting diodes) are attached to the lighting plate 2 facing the bathroom. And the inside of a bathroom is illuminated with the light emitted from each LED.

  With reference to FIG. 2, a terminal plate 12 is attached to the upper surface of the main body case 11 of the instrument 1, and a lamp line 13 for supplying power from an external commercial power source is connected to the terminal plate 12.

  Referring to FIG. 3, power supply unit 3 is housed in main body case 11 below terminal plate 12. This power supply unit 3 steps down the voltage of 100 volts supplied from an external commercial power supply and supplies it to the LED, and also includes a microcomputer for controlling the lighting of the LED, and also generates electric power for driving the microcomputer. doing.

  When an external illumination switch (not shown) is turned on, electric power is supplied from an external commercial power supply via the lamp line 13, and the LED mounted on the lower surface of the illumination plate 2 is turned on. If the power supply from the outside is stopped due to a power failure or the like when this light switch is on, if the LED turns off, especially if you are bathing at night, you can go out of the bathroom to the dressing room and wear clothes. It becomes difficult.

  Therefore, in the present invention, a power storage unit is provided in the appliance 1, and when a power failure or the like occurs, lighting is continued for a predetermined time with the power stored in the power storage unit. In this embodiment, an example in which an electric double layer capacitor is used as a power storage unit will be described.

  FIG. 4 shows an emergency circuit in which the LED 8 is turned on at the time of a power failure or the like by the electric power stored in the electric double layer capacitor 4 during normal energization. Therefore, a normal lighting circuit for lighting the LED 8 with power from an external commercial power supply is omitted.

  When a power failure detection circuit (not shown) detects that there is a power failure, the microcomputer 5 switches the lighting power source from the external power source to the electric double layer capacitor 4. As shown in the drawing, since the plurality of LEDs 8 are connected in series, it is necessary to apply a voltage obtained by multiplying the number of lighting voltages of one LED to both ends of the series circuit of the LEDs 8. Therefore, the voltage of the electric double layer capacitor 4 is boosted by the boost converter 6 and supplied to the LED 8. Then, the operation power of the microcomputer 5 is generated by the step-down converter 7 from the high voltage boosted by the step-up converter 6. In this way, once the voltage is raised by the boost converter 6 and then lowered by the step-down converter 7, the microcomputer 5 can continue to operate until the electric charge stored in the electric double layer capacitor 4 becomes almost zero. .

  The microcomputer 5 constantly monitors the voltage of the electric double layer capacitor 4 by the voltage detection circuit 41. When the stored electric power gradually decreases, the voltage across the electric double layer capacitor 4 decreases, so the microcomputer 5 can monitor the remaining amount of electric power stored in the electric double layer capacitor 4.

  All the LEDs 8 are turned on in a state where the amount of electricity stored in the electric double layer capacitor 4 is sufficient. However, the illuminance is lowered and the rate of reduction in the amount of electricity stored in the electric double layer capacitor 4 is suppressed compared to the case where it is turned on by external power. Specifically, in the case of emitting light with power from an external power source, if the current of the LED 8 is 300 mA, the power is reduced to 50 mA at the time of a power failure or the like. This reduction in current is performed by the transistor 51 connected in series with the LED 8, and the operation of the transistor 51 is controlled by the microcomputer 5.

  When the amount of electricity stored in the electric double capacitor 4 decreases, all LEDs 8 cannot be lit continuously. If left as it is, all the LEDs 8 are turned off at the same time. Therefore, when the voltage across the electric double layer capacitor 4 is lowered to the preset first reference voltage, the microcomputer 5 turns on the transistor 91 to turn on a part (this embodiment). In the embodiment, two LEDs) are short-circuited and turned off, and the remaining LEDs 8 are turned on to suppress power consumption.

  When the voltage across the electric double layer capacitor 4 further decreases to the second reference voltage in this state, the number of LEDs 8 that are turned off is increased by turning on the transistor 92, that is, the number of LEDs 8 that are turned on is reduced, thereby further reducing power consumption. It was decided. When the voltage across the terminals further decreases to the third reference voltage, the transistor 93 is turned on to finally turn on only one LED 8.

  Thus, when power supply from the outside stops like a power failure, the current of the LED 8 is suppressed and the number of the LEDs 8 that are lit in stages is reduced, so that even if the illuminance is small, it takes a long time. LED8 can be kept on.

  In addition, although the said embodiment demonstrated the case where the instrument 1 was attached to the bathroom, an installation place is not limited to a bathroom, For example, it is clear that it may install in other places, such as a corridor of a building. .

  As described above, the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 LED lighting fixture 2 Illumination board 3 Power supply part 4 Electric double layer capacitor 8 LED

Claims (2)

  An LED lighting apparatus that emits light from an electric power supplied from an external commercial power source, and has a power storage unit that is charged by the power from the commercial power source. In the event of a power failure, the LED light is emitted by the power stored in the power storage unit. When a plurality of LEDs are connected in series, and the LEDs are caused to emit light by the power of the power storage unit, a part of the plurality of LEDs is short-circuited as the output voltage of the power storage unit decreases. An LED lighting apparatus comprising a light reduction circuit that emits light only from the remaining LEDs.   2. The LED lighting apparatus according to claim 1, wherein the power storage unit is an electric double layer capacitor.

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