JP6587928B2 - Lighting device - Google Patents

Description

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

  In recent years, many illumination devices using LEDs as light sources have been proposed. Among such illuminating devices, those that are used by being fixed to a ceiling surface or the like cause the LEDs to emit light based on AC power supplied from an external commercial power source. Specifically, a power supply unit is provided, and the power supply unit converts AC power from a commercial power source into DC power of a predetermined voltage, and the DC power is current-controlled and supplied to the LED. ing.

  As described above, when commercial power is used as a power source, the LED is turned off when a power failure from the commercial power source, that is, a so-called power failure occurs. If a power outage occurs at night, etc., the room suddenly becomes dark and the convenience is impaired. Therefore, a power storage unit that is always charged is provided in the lighting fixture, and in the event of a power failure, there is a known configuration that causes the LED to emit light using the power charged in the power storage unit. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2014-220063 (FIG. 4, [0016])

  In such an illuminating device, the illuminating device is installed indoors, and charging of the power storage unit is started when power supply from the commercial power source is started. On the other hand, since the occurrence of a power failure is extremely rare, even if several days are required until the power storage unit is fully charged after the lighting device is installed, no substantial problem occurs. Moreover, in order to charge a charging part rapidly, the capacity | capacitance of a charging circuit must be improved, and since the cost becomes high, the capability of a charging circuit is actually set low. Therefore, the power storage unit is not charged with sufficient power for several hours or about a day after the lighting device is installed, so that the LED can be made to emit light even when the external power supply is stopped. Can not.

  In many cases, the above-described indoor lighting fixtures are installed by an electrician to install the lighting fixtures in the house. When such a construction contractor performs the installation work, it is tested whether the lighting apparatus operates normally after the installation is completed. It can be tested immediately after the construction is completed by turning on / off the lighting switch on the wall etc., but even if the breaker is dropped to make a pseudo power failure As described above, since the power storage unit is not charged with sufficient power, the LED does not light up. Therefore, there is a problem that the construction contractor cannot test immediately after the installation is completed whether or not the LED is lit when a power failure occurs.

  Then, this invention makes it a subject to provide the illuminating device which can test lighting of LED at the time of a power failure in a short time after the installation construction of a lighting fixture is complete | finished in view of said problem.

  In order to solve the above-described problems, a lighting device according to the present invention includes 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 output from the power supply circuit. A booster circuit; and a constant current circuit that controls a current value flowing through the LED to a predetermined value based on DC power boosted by the booster circuit, and a charging circuit provided in parallel with the booster circuit. In the lighting device that boosts the power stored in the power storage unit by the boosting circuit and emits the LED when the supply of AC power from the commercial power supply is stopped A test booster circuit having a higher ratio than the booster ratio of the booster circuit is provided, and the power charged in the power storage unit is alternatively supplied to one of the booster circuit and the test booster circuit. In the state where the power supply from the commercial power supply is stopped, the amount of charge of the power storage unit is small, and the power of the power storage unit is reduced when the voltage of the power storage unit is lower than a specified voltage. It is supplied to a test booster circuit and boosted by the test booster circuit to light the LED.

  Since the booster ratio is low in the original booster circuit, the LED cannot be turned on with the power of the power storage unit that is not fully charged. Therefore, a test booster circuit dedicated to the test at a high booster ratio is provided, and the booster circuit for the test boosts the voltage. Then, the LED is caused to emit light. The boosting ratio of the test booster circuit is higher than the boosting ratio of the normal booster circuit, but it is not necessary to light the LED with high brightness during the test, so the output capacity after boosting may be small.

  Since it is necessary to use a test booster circuit only at the time of testing, a test switch that can be pushed from the outside is provided, and when the test switch is pushed, the power storage unit is charged by the switching means. It is desirable that the DC power that is present be supplied to the test booster circuit.

  Further, there is a case where the light emission of the LED cannot be confirmed in a posture in which the test switch can be pushed and operated. In such a case, when the test switch is pushed, the state in which the DC power charged in the power storage unit is supplied to the test booster circuit is released after the push operation on the test switch is released. It is desirable to continue for a predetermined time.

  Note that if the DC power is supplied to the test booster circuit while the power storage unit is sufficiently charged and the voltage of the power storage unit is high, a voltage higher than the design value may be applied to the constant current circuit. In such a case, when the voltage of the power storage unit is higher than the specified voltage, it is desirable to provide switching prohibiting means for prohibiting the supply of DC power of the power storage unit to the test booster circuit.

  As is clear from the above description, the present invention can confirm that the LED is lit at the time of a power failure even when the power storage unit is not charged with sufficient power immediately after the lighting fixture is installed.

The block diagram which shows the structure of one embodiment of this invention

  Referring to FIG. 1, reference numeral 1 denotes an external commercial power source that supplies 100 volt AC power. The lighting device 2 according to the present invention includes a power supply circuit 21 that outputs AC power from the commercial power source 1 as DC power having 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 is provided. In this way, three lines are wired in the lighting device 2.

  Regardless of whether the wall switch 11 is on or off, the power supply circuit 21 always outputs DC power 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 boost constant current circuit 24 to control the current flowing through the LED 25 to a predetermined current value, thereby causing the LED 25 to emit light.

  However, since the luminance of the LED 25 increases or decreases depending on the current value flowing through the LED 25, the luminance of the LED 25, that is, the current value flowing through the LED 25 is determined by a signal from the luminance setting circuit 26. Since the brightness setting circuit 26 can turn off the LED 25 by reducing the current value, when the wall switch 11 is turned off, the LED 25 is turned off in response to a signal from the wall switch discrimination 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 so that the current value flowing in the LED 25 becomes a preset current value by the signal from the wall switch discrimination circuit 22. 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 source 1 is operating. When the commercial power source 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.

  Incidentally, the power storage unit 28 is composed of six electric double layer capacitors. Since an electric double layer capacitor generally has a low withstand voltage, three electric double layer capacitors are connected in series to increase the overall withstand voltage. However, since the capacitance decreases when connected in series, a separate electric double layer capacitor is connected in parallel to each electric double layer capacitor to ensure the capacitance. A resistor called a balancer is connected in parallel with each electric double layer capacitor so that the capacitance of each electric double layer capacitor is uniform.

  When testing whether or not the LED 25 is lit when a power failure occurs, it is possible to easily generate a pseudo power failure by dropping a breaker (not shown). Therefore, if the breaker is turned off and the LED 25 lights up, the test result is OK. However, immediately after the lighting device 2 is installed and connected to the commercial power source 1, the power storage unit 28 is not charged with sufficient power. That is, since it is rare that a power outage actually occurs, the charging circuit 27 is set to have a low charging capacity for cost reduction, and the power storage unit 28 is designed to take a long time to be fully charged. It is.

  However, if the installer of the illuminating device 2 installs the illuminating device 2 and cannot immediately test that the LED 25 is lit when a power failure occurs, the installer is restrained at the construction site for a long time. Therefore, a test booster circuit 41 having a boost ratio higher than that of the booster circuit 23 is provided, and the power of the power storage unit 28 output from the charging circuit 27 is alternatively sent to the booster circuit 23 and the test booster circuit 41. A supply switching unit 4 is provided.

  The switching unit 4 is switch-controlled by a boost switching circuit 31 to which the test switch 3 is connected. The test switch 3 is a type that is turned on only while being pushed. When the test switch 3 is pushed, the step-up switching circuit 31 tests the state of the switching unit 4 and the power from the charging circuit 27 is tested. The state is switched to that supplied to the booster circuit 41. At the same time, when the breaker is turned off and a pseudo power failure occurs, the power charged in the power storage unit 28 is boosted by the test booster circuit 41 and supplied to the boosted constant current circuit 24, and the LED 25 is lit. Since the brightness of the LED 25 at that time may be low, the brightness setting circuit 26 sets the current value low.

  However, it takes a little time to push the test switch 3 and then move to a position where the breaker is dropped and the LED 25 can be turned on. Therefore, when the test switch 3 is pushed, the boost switching circuit 31 continues the predetermined state for a predetermined time even when the push operation on the test switch 3 is released, and changes the switching state of the switching unit 4 to the test boost circuit 41. The power was kept in a supplied state.

  Incidentally, even when the test switch 3 is pushed while the power storage unit 28 is sufficiently charged, it is not preferable that the power of the power storage unit 28 is supplied to the test booster circuit 41. Therefore, when the voltage of the power storage unit 28 is equal to or higher than a predetermined voltage, even if the test switch 3 is pushed, the boost switching circuit 31 keeps the state of the switching unit 4 and the power from the charging circuit 27 is the boost circuit 23. It was made to hold | maintain in the state with which it was supplied.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Commercial power source 2 Illuminating device 3 Test switch 11 Wall switch 28 Power storage unit

Claims (4)

  A power supply circuit that converts AC power supplied from an external commercial power supply into DC power, a booster circuit that boosts the voltage of the DC power supply output from the power supply circuit, and DC power boosted by the booster circuit A constant current circuit that controls the current value flowing through the LED to a predetermined value, a charging circuit provided in parallel with the booster circuit, a power storage unit that is constantly charged by the charging circuit, When the supply of the AC power is stopped, the test boosting circuit in which the boosting ratio is higher than the boosting ratio of the boosting circuit in the lighting device that boosts the power stored in the power storage unit by the boosting circuit and causes the LED to emit light And switching means for switching to selectively supply power charged in the power storage unit to either the booster circuit or the test booster circuit. When the power supply of the power storage unit is stopped and the charge amount of the power storage unit is small, the power of the power storage unit is supplied to the test booster circuit when the voltage of the power storage unit is lower than the specified voltage. The lighting device is characterized in that the LED is turned on by boosting the pressure.   A test switch that can be pushed from the outside is provided, and when the test switch is pushed, DC power charged in the power storage unit is supplied to the test booster circuit by the switching means. The lighting device according to claim 1.   When the test switch is pushed, the state in which the DC power charged in the power storage unit is supplied to the test booster circuit is continued for a predetermined time after the push operation on the test switch is released. The lighting device according to claim 2, wherein   2. A switching prohibiting means for prohibiting the supply of DC power of the power storage unit to the test booster circuit when the voltage of the power storage unit is higher than the specified voltage. Item 4. The lighting device according to any one of Items 3 to 4.

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