JP2017062887A - Lighting device and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device and a luminaire that is excellent in convenience.SOLUTION: The lighting device comprises a power supply circuit having a rectifier circuit, an electrolytic capacitor, and a switching element, a control device for controlling the operation of the switching element to cause the power supply circuit to output current, and a temperature detection element for measuring the temperature of the power supply circuit. When the power supply circuit is activated, the control device determines whether the temperature detected by the temperature detection element is a predetermined low temperature reference temperature or a predetermined normal temperature higher than the low temperature reference temperature. When the temperature is the normal temperature, the output current of the power supply circuit is increased faster than that when the temperature is the low temperature reference temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device and a lighting device used for controlling, for example, an LED module.

  In a low temperature environment such as a food storage refrigeration facility, the electrolytic capacitor for lighting the LED module is frozen. In Patent Document 1, a target current amount is obtained until a predetermined initial time for the temperature of the electrolytic capacitor to increase to reach a predetermined amount after the AC current is input to the rectifier circuit unit. It is disclosed to output a smaller output current to the light source. Then, the output current of the target current amount is output to the light source after the lapse of the initial time. That is, the lighting device disclosed in Patent Document 1 starts to light up slowly when the lighting device is activated in order to defrost the electrolytic capacitor.

JP 2012-15052 A

  For example, in a low temperature environment such as a food storage refrigeration facility at about −40 ° C., the electrolytic capacitor of the lighting device used for lighting the LED module is frozen and cannot be boosted. Therefore, there is a case where a startup sequence for thawing the electrolytic capacitor is employed by slowly starting up from power-on to all light and turning on all light. In this case, for example, it takes about 10 seconds to slowly reach all-light lighting.

  However, when performing maintenance or the like of the refrigeration facility, the lighting device is at room temperature. Even if the lighting device is at room temperature and the electrolytic capacitor is not frozen, it takes time to reach the all-lights slowly in the start-up sequence for low temperature, so it is not convenient.

  SUMMARY An advantage of some aspects of the invention is that it provides a lighting device and a lighting device that are easy to use.

  A lighting device according to the present invention includes a power supply circuit having a rectifier circuit, an electrolytic capacitor, and a switching element, and a control device that outputs an output current to the power supply circuit by controlling the operation of the switching element. A temperature detection element that measures the temperature of the power supply circuit, and the control device detects whether the temperature detected by the temperature detection element is a predetermined low-temperature reference temperature or the low temperature when the power supply circuit is activated. It is determined whether the temperature is a predetermined normal temperature higher than a reference temperature, and when the temperature is the normal temperature, the output current of the power supply circuit is increased faster than when the temperature is the low temperature reference temperature. To do.

  According to the lighting device of the present invention, since the optimum start-up time and output current control are performed based on the measured value of the temperature sensor, a user-friendly lighting device can be provided.

It is a circuit diagram which shows the lighting device concerning embodiment. It is a flowchart which shows operation | movement of an illuminating device. It is a figure which shows the process sequence by a low temperature control program. It is a figure which shows the process sequence by the control program at the time of normal temperature.

  A lighting device according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment.
FIG. 1 is a circuit diagram showing a lighting device 1 according to an embodiment of the present invention. The illumination device 100 includes an LED module 27 including a plurality of LEDs 27a, a lighting device 1, a dimmer 28, and a dimming signal interface (I / F) circuit 4. The lighting device 1 includes a DC power source 2, a buck converter circuit 3, and a control device 40. The lighting device 100 includes a communication unit that communicates a radio signal between the LED module 27 and the lighting device 1. This communication means includes a transmitter 62 and a receiver 46 for wireless communication. In addition, since the communication technique for performing radio | wireless communication in the transmission part 62 and the receiving part 46 is already well-known and is not a novel matter, the detailed description is abbreviate | omitted.

  The LED module 27 includes a plurality of LEDs 27 a, a temperature detection element 60, a temperature detection circuit 61, and a transmission unit 62. The LED module 27 can take various shapes such as a bulb shape, a straight tube shape, or a sealing shape. The LED module 27 may be removable from the lighting device 1 or may be of a type that cannot be removed. The temperature detection element 60 is, for example, a thermistor, and an output signal of the temperature detection element 60 is input to the temperature detection circuit 61. The temperature detection circuit 61 generates a signal having a value proportional to the detected temperature in the LED module 27 from the output signal of the temperature detection element 60, and transmits the signal to the transmission unit 62. The transmission unit 62 outputs a radio signal. This wireless signal includes temperature information detected by the temperature detection element 60. The radio signal is received by the receiving unit 46 built in the control device 40.

  Although the case where the number of LED elements 27a connected in series is five was illustrated, it is not limited to this and may be more or less than five. In addition, the LED elements 27a may not be connected in series, may be configured in parallel, or may be configured in series-parallel. Although the case where the temperature detection element 60, the temperature detection circuit 61, and the transmission part 62 are arrange | positioned in the LED module 27 was illustrated, these may be unitized separately from the LED module 27, and you may comprise as a temperature detection module. Such a temperature detection module may be disposed in the lighting device 1, may be disposed in the housing of the lighting device 100, or may be disposed in an appropriate place in a freezer that is separated from the lighting device 100. May be. The notification of temperature information from the temperature detection circuit 61 to the control device 40 may not be wireless communication, but may be configured to be connected by wiring and notified by wire. The temperature detection element 60 measures the temperature of the power supply circuit composed of the DC power supply 2 and the buck converter circuit 3 directly or indirectly.

  The DC power source 2 is constituted by, for example, a step-up chopper circuit, and includes a rectifier circuit 8, a capacitor 9 made of a film capacitor, a voltage dividing circuit in which resistors 31 and 32 are connected in series, an inductor 10, a switching element Q1, A diode 14, an electrolytic capacitor 17, and a voltage dividing circuit in which resistors 15 and 16 are connected in series are provided.

  The rectifier circuit 8 is connected to the AC power source 7. The capacitor 9 is connected in parallel to the output terminal of the rectifier circuit 8. The voltage dividing circuit in which the resistors 31 and 32 are connected in series is connected to the capacitor 9 in parallel. The voltage across the capacitor 9 is divided by resistors 31 and 32 and input to the control device 40.

  One end of the inductor 10 is connected to the high potential side of the rectifier circuit 8. The switching element Q1 is a MOSFET in this embodiment. The switching element Q1 includes a first terminal (drain in this embodiment), a second terminal (source in this embodiment), and a control terminal (gate in this embodiment) for switching between the first and second terminals. Yes. The first terminal is connected to the other end of the inductor 10.

  The anode of the diode 14 is connected to the connection point between the first terminal of the switching element Q1 and the other end of the inductor 10. The positive electrode of the electrolytic capacitor 17 is connected to the cathode of the diode 14. The negative electrode of the electrolytic capacitor 17 is connected to the low potential side of the rectifier circuit 8. A voltage dividing circuit in which resistors 15 and 16 are connected in series is connected in parallel to the electrolytic capacitor 17. The voltage across the electrolytic capacitor 17 is divided by the resistors 15 and 16 and input to the control device 40.

  The resistors 15 and 16 are provided at the output terminal of the DC power supply 2 and are used for detecting the output voltage of the DC power supply 2. The detection voltage of the resistor 16 is input to the control device 40. Based on this detected voltage, control device 40 turns on / off switching element Q1 so that the output voltage of DC power supply 2 becomes a constant voltage.

  The buck converter circuit 3 includes a voltage dividing circuit in which a switching element Q2, a diode 21, an inductor (choke coil) 22, a capacitor 23 composed of a film capacitor, a detection resistor 24, and resistors 51 and 52 are connected in series. Yes. A series circuit composed of the switching element Q2 and the diode 21 is connected in parallel with the electrolytic capacitor 17 of the DC power supply 2.

  The switching element Q2 is a MOSFET in this embodiment. The switching element Q2 includes a first terminal (a drain in the present embodiment), a second terminal (a source in the present embodiment), and a control terminal (a gate in the present embodiment) for switching between the first and second terminals. Yes. The first terminal is connected to the positive electrode of the electrolytic capacitor 17, and the second terminal is connected to the cathode of the diode 21. The inductor 22, the capacitor 23, and the detection resistor 24 are connected in this order to form a series circuit. This series circuit is connected to the diode 21 in parallel.

  The detection resistor 24 provided in the buck converter circuit 3 is used to detect the LED current flowing through the LED module 27. A detection voltage from the detection resistor 24 is input to the control device 40. Based on the detected voltage, the control device 40 turns on and off the switching element Q2 of the buck converter circuit 3 so that the current flowing through the LED module 27 becomes a constant current. That is, the control device 40 causes the power supply circuit to output an output current by controlling the operation of the switching element Q2.

  The resistors 51 and 52 are provided at the output terminal of the buck converter circuit 3. The resistors 51 and 52 are used for voltage detection of the LED module 27. The detection voltage of the resistor 52 is input to the control device 40. Based on this detection voltage, the control device 40 detects the presence / absence and abnormality of the LED module 27.

  Since various microcomputers provided as digital power supply control devices are already known, these known microcomputers can be used as appropriate for the control device 40. In addition, the control device 40 can be configured by an arithmetic device such as a DSP (Digital Signal Processor).

  The control device 40 includes control circuits 41 and 42, a storage unit 43, an A / D conversion circuit 44, and a processing device 45 that are connected to each other via an internal bus. The control circuits 41 and 42 output a PWM (Pulse Width Modulation) signal to the switching elements Q1 and Q2. The storage unit 43 is composed of, for example, a nonvolatile memory. The storage unit 43 stores a calculation program to be executed by the processing device 45 (a low temperature control program, a normal temperature control program, etc., which will be described later) and various data used for the calculation. Data is written to and read from the storage unit 43 from the outside. Note that the processing device 45 is, for example, a processor.

  The processing device 45 calculates an on-time or the like in the switching control of the switching elements Q1 and Q2. The control device 40 includes a voltage corresponding to the output voltage of the DC power source 2 divided by the resistors 15 and 16, a voltage corresponding to the voltage obtained by rectifying the AC power source 7 divided by the resistors 31 and 32, and the detection resistor 24. The voltage corresponding to the LED current detected in step S3 and the voltage corresponding to the output voltage of the buck converter circuit 3 divided by the resistors 51 and 52 are input. The A / D conversion circuit 44 converts these voltage values into digital values, and arithmetic processing by the processing device 45 is performed using the digital values.

  The controller 40 controls the DC power supply 2 divided by the resistors 15 and 16 so that the output voltage of the DC power supply 2 divided by the resistors 15 and 16 matches the target voltage set in the storage unit 43 in advance. The on-time of the switching element Q1 is adjusted according to the output voltage. This is constant voltage control.

  Further, the dimming command value from the dimmer 28 is input to the control device 40 via the dimming signal I / F circuit 4. The control device 40 adjusts the ON time of the switching element Q2 based on the LED current detected by the detection resistor 24 so that the LED current matches the target current determined based on the dimming command value. Furthermore, the circuit efficiency of the buck converter circuit 3 written in advance in the storage unit 43, the inductance value of the inductor 22, the forward voltage value of the diode 21, the output current value of the buck converter circuit 3 detected by the detection circuit, the output voltage value, and Constant current control in a substantially critical mode is performed by modulating the frequency of the switching element Q2 based on the input voltage value. The configuration of the control device can be changed as appropriate.

  Hereinafter, the operation of the lighting apparatus 100 will be described.

  The lighting device 100 is used in a low temperature environment such as in a freezer warehouse. The temperature detection element 60 may be disposed in the LED module 27, but may be disposed on the outer wall of the housing of the LED module 27. According to the latter, the ambient temperature of a freezer warehouse can be detected appropriately. Further, the temperature detecting element 60 may be taken out from the LED module 27 in a state where it is connected to the wiring, and may be arranged at an appropriate place in the freezer warehouse. Further, as a more preferable example, the temperature detecting element 60 is mounted next to the electrolytic capacitor 17 that is easily frozen to detect the temperature, and the following control is performed. In FIG. 1, only the electrolytic capacitor 17 is easily frozen, and the capacitors 9 and 23 are not electrolytic capacitors but film capacitors, so they are not frozen. In the above description, the temperature detection element 60 is arranged next to the electrolytic capacitor 17 and the case of a preferred embodiment in terms of detecting the temperature of the electrolytic capacitor 17 has been described. However, the temperature detection element 60 is not adjacent to the electrolytic capacitor 17. It may be arranged near the electrolytic capacitor 17.

  In FIG. 1, one electrolytic capacitor 17 is shown. However, in the case where a plurality of electrolytic capacitors are provided, it is preferable to prepare a plurality of temperature sensing elements 60 and arrange them in the vicinity (preferably next to each) of the electrolytic capacitors, and adopt the lowest temperature.

  FIG. 2 is a flowchart showing the operation of the lighting device 100. First, the AC power source 7 is connected (input) to the lighting device 1 by a switch (not shown) (step S1). An output signal including the temperature detected by the temperature detection element 60 is input to the temperature detection circuit 61. The temperature detection circuit 61 generates a signal having a value proportional to the detected temperature from the output signal, and transmits the signal to the transmission unit 62. The transmitter 62 outputs the signal as a radio signal, and the receiver 46 built in the control device 40 receives the signal (step S2).

  When the control device 40 receives a radio signal including the detected temperature when the power supply circuit (the DC power supply 2 and the buck converter circuit 3) is activated, the processing device 45 detects that the temperature detected by the temperature detecting element 60 is a predetermined low temperature reference temperature. It is determined whether there is a predetermined normal temperature higher than the low temperature reference temperature (step S3). The low temperature reference temperature is, for example, a temperature of −30 ° C. or lower. The normal temperature is, for example, a temperature higher than −30 ° C. Note that the information on the low temperature reference temperature and the normal temperature is preferably stored in the storage unit 43.

  In step S <b> 3, when it is determined that the lighting device 100 has a temperature of −30 ° C. or lower (low temperature reference temperature), the processing device 45 executes a low temperature control program stored in advance in the storage unit 43.

(Control program at low temperature)
FIG. 3 is a diagram showing a processing sequence by the low temperature control program. The processing device 45 maintains a dimming rate of 0% until 0.7 seconds after the AC power supply 7 is turned on, and can be turned on at a dimming rate of 50% after 1.7 seconds after 1 second. A control signal is sent to the control circuit 42 so as to increase the dimming rate to the LED 27a at a constant speed from 0.7 seconds to 1.7 seconds. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal to increase the dimming rate at a constant speed for 1 second from 0.7 seconds to 1.7 seconds. After 7 seconds, the light is adjusted to 50% (step S4).

  The processing device 45 sends a control signal to the control circuit 42 based on the low-temperature lighting control program so as to keep the light control rate 50% lighting for 0.4 seconds from 1.7 seconds to 2.1 seconds. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal, and holds the lighting with 50% dimming rate for the above 0.4 seconds.

  The processing device 45 further increases the dimming rate to the LED 27a at a constant speed from 2.1 seconds to 3.4 seconds based on the low temperature lighting control program, and after 3.4 seconds, the dimming rate is 70. A control signal is sent to the control circuit 42 so that the% can be lit. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal to increase the dimming rate at a constant speed for 1.3 seconds from 2.1 seconds to 3.4 seconds, Turn on the light control rate 70% after 3.4 seconds (step S5).

  The processing device 45 sends a control signal to the control circuit 42 so as to maintain lighting at 70% dimming rate for 0.4 seconds from 3.4 seconds to 3.8 seconds based on the low temperature illumination control program. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal, and keeps the lighting control rate 70% lighting for 0.4 seconds.

  Based on the low temperature illumination control program, the processor 45 further increases the dimming rate to the LED 27a from 3.8 seconds to 7.1 seconds at a constant speed, and after 7.1 seconds, the dimming rate is 100. % A control signal is sent to the control circuit 42 so that all lights can be turned on. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal to increase the dimming rate at a constant speed for 3.3 seconds from 3.8 seconds to 7.1 seconds, 7. After one second, all lights are turned on with a dimming rate of 100% (step S6).

  As described above, it took 1.3 seconds to increase the light control rate from 50% to 20% of the light control rate of 70%, while it took 1 second to increase the light control rate to 50%. Furthermore, it takes 3.3 seconds to increase 30% from the light control rate of 70% to the light control rate of 100%. In other words, a three-step dimming rate increasing step is adopted, and the dimming rate increasing speed is gradually reduced for each step. In other words, in the first dimming rate increase step, a large amount of current is passed in a short time to increase the dimming rate to 50% at a stretch. From the second dimming rate increasing step to the third dimming rate The amount of current was reduced so as to reduce the dimming rate increase rate to the ascending step.

  At a low temperature of −30 ° C. or lower, the electrolytic solution of the electrolytic capacitor 17 is in a frozen state. It is necessary to completely dissolve the electrolytic solution so that a predetermined amount of capacitance can be obtained so that the light can be lit in a stable state when the light control rate is 100%. As described above, the three steps of dimming rate increase step allow a large amount of current to flow so that the dimming rate increases quickly in a short time, and gradually increase the time to increase the dimming rate slowly. By flowing, the electrolytic solution of the electrolytic capacitor 17 can be thawed efficiently.

  As described above, when the temperature detected by the temperature detection element 60 is the low temperature reference temperature, the control device 40 changes the rising speed of the output current of the power supply circuit (the DC power supply 2 and the buck converter circuit 3) over time. Decrease accordingly. Thereby, the electrolyte solution of the electrolytic capacitor 17 can be thawed efficiently. In the above description, the electrolytic solution of the electrolytic capacitor 17 is thawed by three steps of the dimming rate increasing step. The rising speed and the number of steps can be adjusted as appropriate. Further, the low temperature reference temperature and the normal temperature are appropriately set according to a specific apparatus.

  By the way, the following protection function may be added to the lighting device 1 when the power supply circuit is at a temperature lower than the low temperature reference temperature (non-guaranteed temperature). That is, when the temperature detected by the temperature detection element 60 is lower than the low temperature reference temperature, the processing device 45 does not cause the power supply circuit to output an output current. In other words, the switching element Q2 is not turned on. The temperature lower than the low temperature reference temperature (non-guaranteed temperature) is, for example, a temperature lower than −50 ° C. In order to automatically perform such an operation, it is preferable to store the non-guaranteed temperature and the protection program that is a control program when the non-guaranteed temperature is detected in the storage unit 43.

  On the other hand, when it is determined in step S3 that the lighting device 100 has a temperature higher than −30 ° C. (normal temperature), the processing device 45 executes a normal temperature control program stored in the storage unit 43 in advance.

(Normal temperature control program)
The illuminating device 100 of this embodiment is normally arrange | positioned in the place of low temperature environments, such as in a freezer warehouse, and is used under low temperature. However, at the time of maintenance in a freezer warehouse, etc., in consideration of safety, an operator performs maintenance work in an environment of a normal temperature (for example, 25 ° C.). Such illumination control under normal temperature will be described below.

  FIG. 4 is a diagram showing a processing sequence by the normal temperature control program. The processing device 45 maintains a dimming rate of 0% until 0.7 seconds after the AC power supply 7 is turned on based on a normal temperature control program, and further dimming rate after 1 second after 0.3 seconds. A control signal is sent to the control circuit 42 so as to increase the dimming rate to the LED 27a at a constant speed from 0.7 seconds to 1 second so that 5% lower limit dimming can be performed. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal to increase the dimming rate at a constant speed for 0.3 seconds from 0.7 seconds to 1 second, and for 1 second. Later, lower limit dimming with a dimming rate of 5% is performed (step S7).

  Based on the normal temperature control program, the processing device 45 sends a control signal to the control circuit 42 so as to maintain the lower limit dimming lighting with a dimming rate of 5% for 1 second from 1 second to 2 seconds. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal, and holds the lower limit dimming lighting with the dimming rate of 5% for the 1 second. Since the dimming signal is preferentially reflected in the control, the period C1 up to 2 seconds is the output during the lower limit dimming.

  The processing device 45 further increases the dimming rate to the LED 27a at a constant speed from 2 seconds to 3.5 seconds based on the normal temperature control program, and after 3.5 seconds, the dimming rate is 100% full light. A control signal is sent to the control circuit 42 so that it can. 2. The control circuit 42 controls the ON time of the switching element Q2 based on the control signal to increase the dimming rate at a constant speed for 1.5 seconds from 2 seconds to 3.5 seconds, and All the lights are turned on so that the dimming rate becomes 100% after 5 seconds (step S8). The PWM dimming (dimming command value) is 90.5% when the power is turned on, 90.5% is maintained for 2 seconds after the power is turned on, and is held at 5% after 2 seconds. The light period is also retained. Since the dimming command value becomes all light after 2 seconds, the light is shifted to all light during this period C2.

  If the illumination control is performed in the sequence shown in FIG. 3 at the normal temperature, it takes 7.1 seconds to make the dimming rate 100% (all light lighting), which is inconvenient. However, in the lighting device 1 according to the embodiment of the present invention, at a normal temperature, the lower limit dimming lighting is brought to 5% after 1 second from turning on the AC, and the lower limit dimming lighting is held for 1 second. After a short time of 1.5 seconds after 3.5 seconds, the 5% lower limit dimming lighting is changed to 100% all-light lighting at once. Therefore, according to this embodiment, it is possible to shorten the time from turning on the AC power source to turning on all the lights to about one half of the conventional time. Moreover, since such control can be realized automatically, it is easy to use.

  In this embodiment, in a low temperature environment, the case where it takes 7.1 seconds to start up from the AC power supply to all the light is exemplified. However, when it is expected that the temperature is lower than −30 ° C., for example, about −40 ° C., it takes about 10 seconds to start up from power-on to all light. It is very inconvenient to start up to full light over a period of about 10 seconds at normal temperature. However, in the embodiment of the present invention, as described above, it is possible to quickly reach all the light by executing the startup sequence dedicated to the normal temperature. That is, the lower the temperature of the low temperature environment, the more effective the control of the present invention.

  What is important in the control of the lighting device 1 according to the embodiment is that when the power supply circuit is at a normal temperature, the output current of the power supply circuit is increased faster than when the power supply circuit is at a low temperature reference temperature. It is. Various modifications can be made without losing this characteristic.

DESCRIPTION OF SYMBOLS 1 Lighting device, 2 DC power supply, 3 Buck converter circuit, 7 AC power supply, 17 Electrolytic capacitor, 40 Control apparatus, 43 Memory | storage part, 45 Processing apparatus, 60 Temperature detection element

Claims (7)

A power supply circuit having a rectifier circuit, an electrolytic capacitor, and a switching element;
A control device that outputs an output current to the power supply circuit by controlling the operation of the switching element;
A temperature sensing element for measuring the temperature of the power supply circuit,
The control device, when starting the power supply circuit,
Determining whether the temperature detected by the temperature detection element is a predetermined low temperature reference temperature or a predetermined normal temperature higher than the low temperature reference temperature;
The lighting device characterized in that the output current of the power supply circuit is increased more quickly at the normal temperature than at the low temperature reference temperature.   The control device decreases the rate of increase in output current of the power supply circuit as time elapses when the temperature detected by the temperature detection element is the low temperature reference temperature. The lighting device described in 1. It has a storage unit that stores the low temperature control program and the normal temperature control program.
The controller is
When the temperature detected by the temperature detection element is the low temperature reference temperature, the switching element is controlled by executing the low temperature control program,
3. The lighting device according to claim 1, wherein when the temperature detected by the temperature detection element is the normal temperature, the switching element is controlled by executing the normal temperature control program.   The lighting device according to claim 1, wherein the temperature detection element is mounted on an outer wall of a light emitting module that receives supply of an output current of the power supply circuit, or next to the electrolytic capacitor. .   The lighting device according to claim 1, wherein the control device outputs a PWM (Pulse Width Modulation) signal to the switching element.   6. The control device according to claim 1, wherein when the temperature detected by the temperature detection element is lower than the low temperature reference temperature, the control device does not cause the power supply circuit to output an output current. The lighting device described.   The illuminating device provided with the lighting device of any one of Claims 1-6.

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