JP2014211968A - Elevator illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator illumination device capable of securing illumination which does not inconvenience an elevator user even when an illumination LED deteriorates.SOLUTION: An elevator illumination device comprises an illumination measuring device 4 which measures illuminance of a white LED 3 and a central control unit 2 which controls an increase in current flowing to the white LED 3 when illuminance of the white LED 3 measured by the illumination measuring device 4 becomes less than a prescribed value. The elevator illumination device further includes a temperature measuring device 5 which measures a temperature of an illumination device chamber 13 in which the white LED 3 is arranged. The central control unit 2 includes a storage unit which stores the relationship between a temperature of the illumination device chamber 13 and allowable current allowed to flow to the white LED 3. The central control unit 2 calculates allowable current corresponding to the temperature of the illumination device chamber 13 on the basis of the temperature of the illumination device chamber 13 and the relationship stored in the storage unit, and controls a power supply device so that the current flowing to the white LED 3 does not exceed the corresponding allowable current.

Description

  The present invention relates to an illumination device for an elevator having an illumination LED.

  Conventionally, as a light emitting method of an LED lighting device that improves color rendering with less luminance and color unevenness, Patent Document 1 discloses that the amount of current when the white LED of a white LED lighting device emits light is less than the rated current value. Preferably, the input current value is selected in the range of approximately 14% to 75% of the rated current value, or due to the difference in characteristics unique to the white LED, and the current value at which the color tone luminance is appropriate from the minimum current value of light emission. Thereafter, a technique has been proposed in which illumination light is obtained by limiting the input current of the white LED so that light can be emitted in a range below the vicinity.

JP 2011-141952 A

  Patent Document 1 described above discloses an LED lighting device that reduces luminance unevenness and color unevenness, but does not take into account a case where a white LED deteriorates with time after use of the LED lighting device. .

Therefore, when the above-described prior art is employed in the elevator lighting device targeted by the present invention, there is a concern that serviceability for elevator users may be reduced when the white LED deteriorates with time.

  Note that, as a general LED characteristic, not limited to white LEDs, the allowable current that can be flowed in the LED as the ambient temperature rises due to self-heating generated by the current that flows due to temperature and light emission decreases. If the rated current is passed in a state where the allowable current is reduced due to the temperature rise, the difference between the rated current and the allowable current does not contribute to the light emission of the LED at all, but an excessive current flows to the LED. Therefore, this damages the LED and shortens its life.

  The present invention has been made based on the above-described prior art, and an object of the present invention is to provide an elevator illuminating device capable of ensuring illuminance that does not inconvenience the elevator user even when the illumination LED deteriorates. There is to do.

  In order to achieve the above object, an elevator illuminating device according to the present invention includes an illuminance measuring device that measures the illuminance of the illumination LED, and the illuminance measuring device that measures the illuminance of the illumination LED. And a control unit that performs control to increase a current that flows to the illumination LED when the illumination LED has an illuminance that is less than a predetermined value.

  In the present invention, when the illumination LED is deteriorated and the illuminance is measured by the illuminance measuring device, the control unit performs control to increase the current flowing to the illumination LED, and thereby the illuminance of the illumination LED is used by the elevator. It is possible to automatically recover the illuminance without inconvenience to the person. That is, the present invention can secure illuminance that does not inconvenience the elevator user even when the illumination LED deteriorates, and can improve the serviceability for the user.

It is a block diagram which shows schematic structure of the illuminating device of the elevator which concerns on this invention. It is a figure which shows an example of the arrangement | positioning form in the cage | basket of illumination LED with which this embodiment is equipped, illumination intensity measuring apparatus, and temperature measuring apparatus. It is a figure which shows the relationship between the ambient temperature memorize | stored in the memory | storage part contained in the central control part with which this embodiment is provided, and an allowable current ratio.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an elevator lighting device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the illumination unit 1 provided in the present embodiment and provided in the car measures an illumination LED that illuminates the car room 14, for example, a white LED 3, and the illuminance of the white LED 3, and obtains an illuminance measurement value R <b> 1. The illuminance measuring device 4 to be output, the temperature in the lighting device room 13, that is, the ambient temperature of the white LED 3, and the temperature measuring device 5 to output the temperature measurement value R2, the exhaust fan 6 for exhaust heat, and the cab 14 And a power supply device 7 for supplying current to the ventilation fan 6.

  In the present embodiment, the illuminance measurement value R1 output from the illuminance measurement device 4 and the temperature measurement value R2 output from the temperature measurement device 5 are input, and the control unit that controls the power supply device 7, that is, the central control unit 2 It has. The central control unit 2 supplies a current to be supplied to the white LED 3 when the illuminance of the white LED 3 measured by the illuminance measurement device 4, that is, the illuminance measurement value R1 is less than a predetermined value, for example, 70% of the initial value. The power supply device 7 is controlled to increase. The aforementioned initial value is set by adjusting the output level of the illuminance measuring device by operating a maintenance terminal (not shown), a dip switch (not shown) or the like when a new elevator is installed or the white LED 3 is replaced.

  Further, as shown in FIG. 3, the central control unit 2, the temperature of the lighting device room 13, that is, the ambient temperature 15 of the white LED 3, and the allowable current ratio that allows the white LED 3 to flow (allowance for the rated current of the white LED 3). The ratio of the current) 16 is stored, and the temperature of the lighting device chamber 13 measured by the temperature measuring device 5, that is, the temperature measurement value R 2, and the relationship stored in the storage unit described above. Thus, the calculated value 17 of the allowable current ratio corresponding to the temperature of the lighting device room 13 is obtained, and the power supply device 7 is controlled so that the current flowing through the illumination LED 3 does not exceed the calculated value 17 of the corresponding allowable current ratio.

  The central control unit 2 includes a current selection unit (not shown) that performs an operation of selectively flowing a current exceeding the allowable current to the white LED 3.

  In addition, as shown in FIG. 1, the present embodiment is connected to the central control unit 2, and when an abnormality is detected in the white LED 3 that illuminates the car interior 14, the monitoring center (not shown) installed outside is detected. An external alarm device 8 for reporting is provided.

  As shown in FIG. 2, the white LED 3 of the present embodiment that emits light when an electric current is passed is provided on a car top plate 9. The lighting device room 13 and the car interior room 14 are partitioned by the shielding plate 12 placed on the bracket 11 provided on the car side plate 10 fastened to the car top plate 9, and the light emitted from the white LED 3 is shielded. The car interior 14 is irradiated through a slit (not shown) formed in 12 to illuminate the car interior 14. An illuminance measuring device 4 and a temperature measuring device 5 are attached to the wall surface of the car side plate 10 that forms the lighting device chamber 13. The above-described ventilation fan 6 that discharges the heat in the lighting device chamber 13 to the outside is provided on, for example, the car top plate 9.

  In addition, there is a possibility that the white LED is extinguished at the time of no-call suspension and it is mistakenly recognized that the white LED 3 is out of sphere, that is, has reached the end of its life. In order to prevent this, this embodiment also includes a circuit (not shown) that cancels the operation of the illuminance measuring device 4 during a call-free pause.

  In the present embodiment configured as described above, the illuminance measurement device 4 operates as the car moves up and down, and the illuminance measurement value R1 measured by the illuminance measurement device 4 is output to the central control unit 2. The central control unit 2 determines whether the value of the illuminance measurement value R1 is less than 70% of the initial value. Here, when the white LED 3 deteriorates over time and the illuminance measurement value R1 is determined to be less than 70%, the current flowing through the white LED 3 is increased so that the illuminance measurement value R1 becomes 70% or more of the initial value. The central control unit 2 controls the power supply device 7. When the central control unit 2 determines that the illuminance measurement value R1 has reached 70% or more of the initial value, the central control unit 2 controls the power supply device 7 so as to stop the increase in current flowing through the white LED 3.

  Here, even when the current value passed through the white LED 3 is set to the rated current value, when the central control unit 2 determines that the illuminance measurement device R1 has not reached 70% of the initial value, the corresponding white LED 3 has a lifetime. The central control unit 2 controls the power supply device 7 so as to stop the increase in the current flowing through the white LED 3, and also connects the car to an external monitoring center (not shown) via the external alarm device 8. A notification process is performed to indicate that an abnormality has occurred in the white LED 3 provided in the illumination unit 1. The monitoring center (not shown) that has received this notification can take quick action such as replacing the white LED 3.

  In addition, the present embodiment also performs control in consideration of the allowable current that flows through the white LED 3. The relationship shown in FIG. 3 is a relationship in which the calculated value 17 of the allowable current ratio 16 decreases as the temperature of the lighting device chamber 13, that is, the ambient temperature 15 of the white LED 3 increases. As described above, when the calculated current value 17 of the allowable current ratio of the white LED 3 is reduced and the current flowing through the white LED 3 is increased, if the current exceeding the allowable current is supplied to the white LED 3, the allowable current is exceeded. The minute current does not contribute to the light emission of the white LED 3, damages the white LED 3, and shortens the lifetime of the white LED 3 provided on the car top 9.

  Here, when it is determined that the illuminance measurement value R1 is 70% or less of the initial value, control is performed to increase the current flowing through the white LED 3 as described above. At this time, the central control unit 2 Based on the output temperature measurement value R2, the corresponding calculated value 17 of the allowable current ratio is obtained, and the power supply device 7 is controlled so that a current not exceeding the calculated value 17 flows through the white LED 3. When the illuminance measurement value R1 cannot secure 70% or more of the initial value within a range where the current flowing through the white LED 3 does not exceed the calculated value 17 of the allowable current ratio, the central control device 2 performs control to operate the ventilation fan 6 to Exhaust heat of the device chamber 13 is performed. Due to this exhaust heat, the temperature of the lighting device chamber 13 decreases, and the calculated value 17 of the allowable current ratio can be increased. Along with this, the current flowing through the white LED 3 can be gradually increased. Thereafter, until the illuminance measurement value R1 becomes 70% or more of the initial value, the central control unit 2 repeatedly performs the increase control of the current passed through the white LED 3 and the determination of the illuminance measurement value R1 as necessary.

  The power supply of the ventilation fan 6 may be provided separately from the power supply of the white LED 3, but by configuring a power supply circuit shared with the power supply of the white LED 3 as in the present embodiment, the allowable current out of the current flowing through the white LED 3 is configured. The ventilation fan 6 can be operated with a current value exceeding. By doing in this way, the electric current which flows into the ventilation fan 6 reduces according to the raise of the allowable electric current of white LED3, and the operation | movement of the ventilation fan 6 can be controlled.

  Note that the control in the central control unit 2 may be a control that does not increase the current flowing through the white LED 3 until the temperature measurement value R2 of the temperature measurement device 5 falls to a specific temperature. In such a case, damage to the white LED 3 can be reduced.

  By the way, in summer when the temperature is high, even if the ventilation fan 6 is operated, the temperature of the lighting device room 13 does not decrease, and even when the illuminance falls below 70% of the initial value, the current flowing through the white LED 3 cannot be increased. It may be difficult to determine whether the LED 3 has reached the end of its life. In such a case, if a current selection unit (not shown) provided in the central control unit 2 of the present embodiment is operated to temporarily control the white LED 3 so that a large current up to the rated current is exceeded. Good. By causing such a relatively large current to flow through the white LED 3, the illuminance of the white LED 3 can be set to 70% or more of the initial value. Further, when it is determined that the measured illuminance measurement value R1 does not reach 70% of the initial value even when a relatively large current flows in this way, it can be determined that the white LED 3 has reached the end of its life.

  According to the elevator illuminating device according to the present embodiment, as described above, when the illuminance measuring device 4 measures that the white LED 3 has deteriorated and the illuminance has decreased, the current supplied to the illuminating LED 3 by the central control unit 2 is increased. Thus, the white LED 3 can be automatically restored to an illuminance of 70% or more of the initial value which does not inconvenience the elevator user. That is, this embodiment can secure the illuminance that does not inconvenience the elevator user even when the white LED 3 is deteriorated, and can improve the serviceability for the user.

DESCRIPTION OF SYMBOLS 1 Illumination part 2 Central control part 3 White LED (illumination LED)
4 Illuminance Measuring Device 5 Temperature Measuring Device 6 Ventilation Fan 7 Power Supply Device 8 External Alarm Device 9 Car Top Plate 10 Car Side Plate 11 Bracket 12 Shielding Plate 13 Lighting Device Room 14 Car Interior Room 15 Ambient Temperature 16 Allowable Current Ratio 17 Calculated Value R1 Illuminance Measured value R2 Temperature measured value

Claims (4)

In an elevator lighting apparatus having an illumination LED,
An illuminance measuring device that measures the illuminance of the illumination LED, and a control that increases the current that flows to the illumination LED when the illuminance of the illumination LED measured by the illuminance measurement device is less than a predetermined value. An elevator illuminating device comprising: a controller for performing the operation. The elevator lighting device according to claim 1,
An illumination device room in which the illumination LED is disposed, and a temperature measurement device for measuring the temperature of the illumination device room,
The control unit includes a storage unit that stores a relationship between a temperature of the lighting device room and an allowable current that is allowed to flow through the lighting LED;
The control unit obtains an allowable current corresponding to the temperature of the lighting device room based on the temperature of the lighting device room measured by the temperature measuring device and the relationship stored in the storage unit, and An elevator illuminating device, wherein the current flowing through the LED is controlled so as not to exceed the corresponding allowable current. The elevator lighting device according to claim 2,
The said control part has an electric current selection part which performs the process which sends the electric current which exceeds an allowable current selectively to the said illumination LED, The illuminating device of the elevator characterized by the above-mentioned. In the elevator illuminating device according to claim 2 or 3,
The lighting LED is arranged in a lighting device room located in the upper part of the car room, and consists of a white LED for illuminating the car room,
An illuminating device for an elevator, wherein the illuminating device room is provided with a ventilation fan for exhausting the heat in the illuminating device room to the outside.

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