JP6682133B2 - Lighting equipment - Google Patents

Description

  The present invention relates to a lighting device that uses an LED as a light emitting source and causes the light emitting source to emit light by the electric power charged in a power storage unit when an external commercial power supply fails.

  In recent years, many lighting devices using LEDs as light emitting sources have been proposed. Since LEDs consume less power than incandescent bulbs and fluorescent lamps before that, even a lighting device that emits light with power from an external commercial power supply can have a small power storage unit for continuing light emission during a power failure. In particular, as a lighting device using an LED as a light source, there is known a lighting device capable of continuously emitting light from an LED bulb in the event of a power failure (for example, see Patent Document 1).

  In this product, an electric double layer capacitor is used as a power storage unit, and the power storage unit is always charged while receiving power from a commercial power source.When the commercial power source fails, the power storage unit is automatically charged. The LED is configured to emit light with the power that is present.

JP-A-2014-220063 (FIG. 4, [0016])

When a so-called storage battery is used as the power storage unit, since the storage battery has a relatively short life of several years, it is necessary to regularly check the deterioration of the storage battery. However, as described in Patent Document 1 above, when an electric double layer capacitor is used as a power storage unit, the life of the electric double layer capacitor is much longer than the life of the storage battery. There is no regular check of the condition of the capacitors.

  However, even an electric double layer capacitor has a life, and when deterioration progresses, the amount of power that can be stored decreases, and the time during which an LED can emit light is shortened in the event of a power failure. Further, there is a problem that deterioration of the electric double layer capacitor cannot be detected until the LED is turned off in a short time when a power failure actually occurs.

  In view of the above problems, it is an object of the present invention to provide a lighting device that can detect deterioration of a power storage unit before a power failure occurs.

In order to solve the above-mentioned problems, a lighting device according to the present invention has a power supply circuit that converts AC power supplied from an external commercial power supply into DC power, and boosts the voltage of the DC power supply output from this power supply circuit. The charging circuit includes a booster circuit and a constant current circuit that controls a current value flowing through the LED to a predetermined value based on the DC power boosted by the booster circuit, and a charging circuit is provided in parallel with the boosting circuit. In the lighting device, which includes a power storage unit that is constantly charged by, when the supply of the AC power from the commercial power supply is stopped, the power stored in the power storage unit is boosted by the booster circuit to cause the LED to emit light, While the power is being supplied from the commercial power source, the power of the power storage unit is turned off while the charging circuit suspends charging of the power storage unit by the charging circuit and the charging of the power storage unit is stopped. Expended so, and deterioration determining means for determining the deterioration state of the power storage unit from the lowering speed of the voltage of the power storage unit is provided, a timer for counting a time elapsed from the time of receiving power supply from the commercial power supply to the first In order to activate the deterioration determining means each time the measured time reaches a predetermined cycle, a switch for turning on / off the LED is provided outside, and the time measured by the timer is When the preset life time is exceeded, the deterioration determining means is activated each time the switch is turned on .

  When the power storage unit deteriorates, the amount of electric power being charged decreases, so that even if the voltage at the start of discharge is sufficiently high, the voltage drop rate after the start of discharge becomes faster. Therefore, the deterioration determining unit determines whether or not there is deterioration from the voltage drop speed by consuming the electric power actually charged in the power storage unit. At this time, it is necessary to interrupt the charging of the power storage unit, but since the check is performed while the power is being supplied from the external commercial power source, no problem occurs in the lighting state of the LED.

It should be noted that specifically, a timer for counting the elapsed time from the time when the power supply from the commercial power source is first received is built in, and the deterioration determination means is activated every time the measured time reaches a predetermined cycle. Ru is.

Further, in that case, a switch for turning on and off the LED is provided outside, and when the time measured by the timer exceeds a preset life time, the deterioration judgment is made every time the switch is turned on. Ru to operate the means.

  In particular, the power storage unit is effective when it is an electric double layer capacitor.

  As is clear from the above description, the present invention detects the deterioration of the power storage unit before a power failure occurs, so that when the power failure occurs, the time during which the LED can emit light is shortened. The trouble can be avoided.

Block diagram showing the configuration of an embodiment of the present invention

  Referring to FIG. 1, reference numeral 1 is an external commercial power supply, which supplies 100 V AC power. The lighting device 2 according to the present invention is provided with a power supply circuit 21 that outputs the AC power from the commercial power supply 1 as DC power of a predetermined voltage. Further, a wall switch discrimination circuit 22 for detecting the on / off state of the external wall switch 11 for turning on / off the light is provided. In this way, three lines are wired in the lighting device 2.

  The power supply circuit 21 always outputs DC power regardless of the on / off state of the wall switch 11 as long as the commercial power supply 1 does not fail. The DC power is first boosted by the booster circuit 23 and then secondarily boosted by the boosting constant current circuit 24 to control the current flowing through the LED 25 to a predetermined current value to cause the LED 25 to emit light.

  However, since the brightness of the LED 25 increases or decreases depending on the current value flowing through the LED 25, the brightness of the LED 25, that is, the current value flowing through the LED 25 is determined by the signal from the brightness setting circuit 26. Further, since the brightness setting circuit 26 can turn off the LED 25 by lowering the current value thereof, when the wall switch 11 is turned off, the LED 25 is turned off by receiving a signal from the wall switch determination circuit 22. On the contrary, when the wall switch 11 is turned on, the secondary boosting in the boosting constant current circuit 24 is performed by the signal from the wall switch determination circuit 22 so that the current value flowing through the LED 25 becomes a preset current value. Adjust the ratio.

  In addition to the booster circuit 23, a charging circuit 27 is connected in parallel to the output side of the power supply circuit 21. The charging circuit 27 constantly charges the power storage unit 28 when the commercial power supply 1 is operating. When the commercial power supply 1 fails, the power stored in the power storage unit 28 is supplied to the booster circuit 23. The LED 25 continues to emit light while the commercial power source 1 is out of power.

  The power storage unit 28 is composed of six electric double layer capacitors. Since electric double layer capacitors generally have low withstand voltage, three electric double layer capacitors were connected in series to increase the withstand voltage as a whole. However, since the capacity decreases when connected in series, a separate electric double layer capacitor is connected in parallel to each electric double layer capacitor to ensure the capacity. A resistor called a balancer is connected in parallel to each electric double layer capacitor so that the electric capacity of each electric double layer capacitor becomes uniform.

  Then, a series circuit of the transistor 3 as the switching element and the two voltage dividing resistors 41 and 42 was connected so as to straddle both ends of the power storage unit 28. Then, the transistor 29 is turned on and off by the CPU 29.

  The CPU 29 has a timer as a timekeeping means built therein, and counts the timer from the time when the lighting device 2 is connected to the commercial power supply 1, and the number of years when deterioration of the electric double layer capacitor is concerned, for example, 10 years have passed. Then, thereafter, the charging by the charging circuit 27 is stopped and the transistor 3 is turned on, for example, in a cycle of one year. Then, the electric power stored in the power storage unit 28 is consumed through the two voltage dividing resistors 41 and 42. Therefore, the voltage at the intermediate portion between the voltage dividing resistors 41 and 42 drops. When the descending speed is faster than a preset reference speed, it is determined that the power storage unit 28 is deteriorated, and the fact is notified by, for example, changing the brightness of the LED 25.

  By the way, in the above example, after 10 years have passed, the deterioration state of the power storage unit 28 is checked every year thereafter. However, as another example, after 10 years have passed, the power storage unit 28 is turned on every time the wall switch 11 is turned on. 28 may be checked for deterioration.

  It should be noted that 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.

1 Commercial Power Supply 2 Lighting Device 3 Transistor 11 Wall Switch 28 Storage Unit 41 Voltage Dividing Resistor 42 Voltage Dividing Resistor

Claims (2)

It has a power supply circuit that converts AC power supplied from an external commercial power supply to DC power, and a booster circuit that boosts the voltage of the DC power supply output from this power supply circuit and the DC power boosted by this booster circuit. A constant current circuit that controls the current value flowing through the LED to a predetermined value is provided, a charging circuit is provided in parallel with the booster circuit, and a power storage unit that is constantly charged by the charging circuit is provided. When the supply of the AC power is stopped, the lighting device that boosts the power stored in the power storage unit by the booster circuit to cause the LEDs to emit light is charged with the power supplied from the commercial power supply. The charging interruption means for interrupting the charging of the power storage unit by the circuit and the electric power consumption of the power storage unit in the state where the charging of the power storage unit is interrupted, and the deterioration of the power storage unit due to the voltage drop rate of the power storage unit. And deterioration determination means for determining the status provided, first counting the elapsed time from the time of receiving to a timer, the deterioration in every measured time reaches a predetermined period of power supply from the commercial power supply A switch for activating the judging means and for turning on and off the LED is provided outside, and this switch is turned on when the time measured by the timer exceeds a preset life time. An illuminating device characterized in that the deterioration determining means is activated for each time . The lighting device according to claim 1, wherein the power storage unit is an electric double layer capacitor.

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