JP2011009232A - Illumination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device that can control driving, corresponding to the states of connecting light-emitting modules.SOLUTION: Light-emitting modules 13 equipped with main terminals 13a, 13b which are connectable pairs for a constant-current power source 12, and one or more power source(s) connected between these pairs of main terminals are arranged connectable in parallel. Connecting information that is outputted from resistances 53 provided to respective light-emitting modules 13 is recognized by a control section 16, and the output current from the constant current power source 12 is made variable. Driving can be controlled, corresponding to the state of the connecting light-emitting module 13.

Description

The present invention relates to an illuminating device capable of connecting light emitting modules each including one light source and a plurality of light sources connected in series to each other in parallel.

  2. Description of the Related Art Conventionally, for example, there is an illumination device that can connect a plurality of LED modules, which are light emitting modules in which a plurality of light emitting diodes (LEDs) are connected in series as a light source, to a power supply. Such an illumination device is configured to supply a constant current to the light emitting module using the power source as a constant current power source in order to light the LEDs of each light emitting module substantially uniformly (see, for example, Patent Documents 1 to 4). .)

JP-A-11-68161 (6th page, FIG. 1) Japanese Patent Laid-Open No. 2002-8409 (page 4, FIG. 1) JP 2007-27316 A (page 11, FIG. 1) Japanese Patent Laying-Open No. 2007-96287 (page 6-7, FIG. 1-2)

  However, in the above-described lighting device, since the power source is a constant current power source, it is effective when the number of LED module connections is set in advance, but when the number of LED module connections is arbitrarily increased or decreased, etc. The problem is that the drive cannot be controlled according to the state of the connected LED module, such as the current supplied to each LED module is insufficient or too large, and the LED cannot emit light in a desired state. Have.

  This invention is made | formed in view of such a point, and it aims at providing the illuminating device which can control a drive corresponding to the state of the light emitting module to connect.

  The lighting device according to claim 1, comprising: a constant current power source; a pair of main terminals connectable to the constant current power source; and one or more light sources connected between the pair of main terminals. A light emitting module provided; an information output unit including a resistor connected between main terminals of the light emitting module and outputting connection information of the light emitting module; and recognizing connection information of the light emitting module by a current flowing through the resistor A control unit for controlling the driving of the constant current power source.

  Further, the lighting device according to claim 2 is the lighting device according to claim 1, wherein the controller is configured such that the voltage applied between the main terminals by the constant current power source is lower than the voltage during lighting of the light source. The current flowing through the resistor is recognized as connection information of the light emitting module.

  The light source is preferably an LED, for example, but is not limited to an LED.

  The light emitting module is, for example, a unit in which one or more light sources are arranged in a predetermined arrangement.

  The control unit is, for example, a microcomputer provided in a constant current power source.

  The control unit emits the current flowing through the resistor when the voltage between the main terminals is lower than the voltage at which the light source emits light in a predetermined state, which is connection information output from the information output unit provided in each of the light emitting modules. Since it is recognized as module connection information, driving can be controlled in accordance with the state of the connected light emitting module.

  According to the lighting device of the present invention, the information output unit includes a resistor provided in the light-emitting module, and the driving of the constant current power source is controlled by recognizing the connection information of the light-emitting module by the current flowing through the resistor. The drive can be controlled in accordance with the state of the light emitting module. In addition, since the control unit recognizes the current flowing through the information output resistor while being connected between the main terminals as connection information of the light emitting module, the main terminal of the light emitting module can be easily shared.

It is a circuit diagram of the illuminating device which shows the 1st Embodiment of this invention. It is a circuit diagram of the illuminating device which shows the 2nd Embodiment of this invention. It is a circuit diagram of the illuminating device which shows the 3rd Embodiment of this invention. It is a graph which shows the output voltage of the constant current power supply of an illuminating device same as the above. It is a circuit diagram of the illuminating device which shows the 4th Embodiment of this invention. It is a graph which shows the electrical property of the light source of an illuminating device same as the above. It is a graph which shows operation | movement of an illuminating device same as the above. It is a graph which shows the output voltage of the constant current power supply of the illuminating device of the 5th Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment, and FIG. 1 is a circuit diagram of a lighting device.

  As shown in FIG. 1, in an LED lighting device 11 that is a lighting device, one or a plurality of light emitting modules 13 are connected in parallel to a constant current power source 12.

  The constant current power source 12 is connected to the commercial AC power source e via a diode bridge DB that is a rectifying unit. The constant current power source 12 has output terminals 12a and 12b connected to the main terminals 13a and 13b of the light emitting module 13, respectively, and an input terminal 12c to which connection information output from each light emitting module 13 is input. In addition, a semi-fixed variable constant current source 15 that can variably set the output current IL is provided between the output terminals 12a and 12b.

  The control unit 16 is a microcomputer, for example, and is connected to the input terminal 12c to recognize connection information from each light emitting module 13 and set an output current from the variable constant current source 15 (constant current power supply 12). Is. Further, a DC power source 17 that is a constant voltage source is connected via a resistor 18 between the control unit 16 and the input terminal 12c.

  In each light emitting module 13, a resistor 21, a transistor 22 as a switching element, and an LED 23 as one or a plurality of light sources are connected in series with each other between the main terminals 13a and 13b. An information output resistor 24 for outputting connection information is connected to the terminal 13b, and this information output resistor 24 is connected to the information output terminal 13c.

  The transistor 22 is, for example, a PNP-type bipolar transistor. An emitter as an output terminal is connected to the resistor 21 to set an emitter potential, and a collector as an input terminal is connected to the LED 23. The transistor 22 of the first light emitting module 13 connected to the constant current power supply 12 is connected to the base whose emitter is the control terminal. The bases of the transistors 22 of the light emitting modules 13 are connected to each other via the output terminal 13d of the light emitting module 13, and the base potentials of the transistors 22 of the light emitting modules 13 are set to the same potential. Therefore, these transistors 22 form a leveling circuit and are configured such that the lighting currents of the LEDs 23 flowing through all the light emitting modules 13 are the same current.

  The information output resistors 24 are set to have substantially the same resistance value, and are connected in parallel between the information output terminals 13c. Therefore, these information output resistors 24 are connected in parallel to the DC power supply 17 of the constant current power supply 12. The information output resistor 26 and the information output terminal 13c constitute an information output unit 26.

  Next, the operation of the present embodiment will be described.

  When a predetermined output current IL is output from the variable constant current source 15 of the constant current power source 12 between the output terminals 12a and 12b, a lighting current is supplied to each light emitting module 13 connected in parallel to the constant current power source 12. Flows and each LED 23 emits light.

  At this time, the lighting currents of the light emitting modules 13 are set to be approximately equal to each other by the leveling action of the transistors 22. That is, the lighting current of each light emitting module 13 is a current obtained by equally dividing the output current IL by the number of light emitting modules 13, and the LEDs 23 of each light emitting module 13 emit light substantially uniformly.

  On the other hand, in the constant current power supply 12, since the number of information output resistors 24 connected in parallel to the DC power supply 17 differs depending on the number of connected light emitting modules 13, the resistance 18 connected to the control unit 16 and The potential at the position between the input terminal 12c changes. That is, when the number of connected light emitting modules 13 increases or decreases, the number of information output resistors 24 connected in parallel with each other increases or decreases, so that the total resistance value on the information output resistor 24 side decreases or increases in inverse proportion, and the resistance The potential at the position between 18 and the input terminal 12c decreases or increases.

  Then, the control unit 16 reads this potential to recognize the connection information of the light emitting module 13, here, the number of connections. Therefore, the output current IL supplied from the variable constant current source 15 corresponding to the recognized number of connections. Is variable.

  In this way, the control unit 16 varies the output current IL of the constant current power supply 12 according to the connection information output from the information output unit 26 provided in each of the light emitting modules 13, here the number of connections of the light emitting modules 13. Thus, the driving of the LED lighting device 11 can be controlled in accordance with the state of the connected light emitting module 13.

  In addition, by configuring the information output unit 26 with the information output resistor 24 and the information output terminal 13c, the information output unit 26 can be easily configured in each light emitting module 13, and the configuration of the light emitting module 13 can be prevented from being complicated.

  Next, FIG. 2 shows a second embodiment, and FIG. 2 is a circuit diagram of the lighting device. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this second embodiment, instead of the information output resistor 24 of each light emitting module 13 of the first embodiment, a microcomputer 31 as a storage unit as an information unit is connected via a power circuit 32. Thus, the information output unit 26 is configured.

  Each microcomputer 31 detects an abnormality of the LED 23 of the light emitting module 13 through the load abnormality detection unit 34. Each microcomputer 31 includes, as connection information of the light emitting module 13, for example, the specification and number of the light emitting modules 13, the cumulative lighting time in the light emitting module 13, and the load abnormality information output from the load abnormality detecting unit 34, etc. Is stored in a built-in memory (not shown) or the like.

  The power supply circuit 32 supplies power to the microcomputer 31, and a transistor 35 connected in parallel with the resistor 21 with respect to the main terminal 13a, a Zener diode 36 and a capacitor 37 connected to the transistor 35, have.

  The transistor 35 is, for example, an NPN-type bipolar transistor, the collector is connected in parallel with the resistor 21, the base is connected to the cathode side of the Zener diode 36, and the emitter is connected to the positive side of the capacitor 37. ing.

  The Zener diode 36 sets the base potential of the transistor 35, and the anode side is grounded via the main terminal 13b.

  The capacitor 37 charges the power supplied to each microcomputer 31, and is a large-capacitance capacitor such as an electrolytic capacitor, for example. The plus side and the minus side are connected to the microcomputer 31, respectively, and the minus side is the main terminal. It is grounded through 13b.

  In each light emitting module 13, most of the lighting current supplied from the constant current power supply 12 flows to the LED 23 through the resistor 21 and the transistor 22, and all the light emitting modules are obtained by the leveling action of the resistor 21 and the transistor 22. At 13, the LEDs 23 light up substantially uniformly. At the same time, a part of the lighting current is charged to the capacitor 37 by the action of the transistor 35 and power is supplied to the microcomputer 31, and various connection information is output from the microcomputer 31 to the control unit 16. The capacitor 37 can be charged to a voltage substantially equal to the breakdown voltage of the Zener diode 36.

  Further, the control unit 16 controls the operation of the constant current power supply 12 based on the connection information output from the microcomputer 31 of each light emitting module 13 to control the driving of the LED lighting device 11.

  That is, the control unit 16 increases or decreases the output current IL supplied from the variable constant current source 15 according to the specification and the number of the light emitting modules 13 output from the microcomputer 31, for example, or the light emitting module 13 output from the microcomputer 31. If the accumulated lighting time is longer than a predetermined time set in advance, the driving of the LED lighting device 11 is stopped, or, for example, the LED 23 is opened (opened) or shorted (shorted) as load abnormality information output from the microcomputer 31. If the load abnormalities occur, such as by limiting the output current IL or stopping the operation of the LED lighting device 11, the state of the connected light emitting module 13 can be dealt with. Thus, the driving of the LED lighting device 11 can be controlled.

  In addition, since the information output unit 26 includes the microcomputer 31, various connection information of the light emitting module 13 can be stored in the microcomputer 31, so that the driving of the light emitting module 13 can be varied according to the connection information. Can be controlled.

  Next, FIG. 3 and FIG. 4 show a third embodiment, FIG. 3 is a circuit diagram of the lighting device, and FIG. 4 is a graph showing an output voltage of a constant current power source of the lighting device. In addition, about the structure and effect | action similar to the said 2nd Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment, a parallel circuit of a resistor 41 and a transistor 42 as an information section is connected between the LED 23 and the main terminal 13b in the first embodiment.

  The transistor 42 is, for example, an NPN type bipolar transistor. A collector is connected to the LED 23 side, an emitter is grounded via the main terminal 13b, and a resistor 41 is connected between the collector and emitter. Further, a pulse power source 43 is connected between the base and emitter of the transistor 42 of the first light emitting module 13 connected to the constant current power source 12, and the information output unit is connected by the resistor 41, the transistor 42 and the pulse power source 43. 26 is configured. The pulse power supply 43 is connected to the bases of the transistors 42 of all the other light emitting modules 13 via the connection terminal 13e.

  Further, the constant current power source 12 includes an output voltage detection unit 45 that detects the output voltage Vout between the output terminals 12a and 12b, and the state of the light emitting module 13 based on the output voltage Vout detected by the output voltage detection unit 45. A load mounting state determination unit 46 for determination is provided, and the output voltage detection unit 45 and the load mounting state determination unit 46 constitute the control unit 16.

  In each light emitting module 13, the lighting current supplied from the constant current power supply 12 flows to the LED 23 through the resistor 21 and the transistor 22, and the leveling action of the resistor 21 and the transistor 22 causes the LED 23 in all the light emitting modules 13. Lights up almost uniformly.

  Further, in the information output unit 26, a pulse voltage is applied between the base and emitter of the transistor 42 at a duty ratio or frequency set for each type of the light emitting module 13 from the pulse power source 43, so that the transistor 42 is predetermined. Since the ON / OFF operation is repeated at the period of, the potential difference between both ends of the resistor 41 (the collector-emitter voltage of the transistor 42) periodically decreases. For this reason, the voltage between the main terminals 13a and 13b of the light emitting module 13, that is, the output voltage Vout of the constant current power supply 12 periodically decreases, for example, by the voltage Va as shown in FIG.

  Therefore, when the output voltage detection unit 45 detects the frequency of increase / decrease in the output voltage Vout, the load mounting state determination unit 46 detects the type of the connected light emitting module 13, and the detected type of the light emitting module 13 is detected. Correspondingly, the load mounting state determination unit 46 sets the output current IL from the variable constant current source 15.

  In addition, when the number of connected light emitting modules 13 increases, the supply current to each transistor 42 connected in parallel to the pulse power supply 43 decreases, so that the potential difference between both ends of the resistor 41 of each light emitting module 13 is inversely proportional. Therefore, the voltage Va at the output voltage Vout of the constant current power supply 12 increases.

  Therefore, by detecting the magnitude of the voltage Va, that is, the amplitude of the output voltage Vout by the output voltage detection unit 45, the load mounting state determination unit 46 can detect the number of connections of the light emitting module 13, and the detected light emission Corresponding to the number of modules 13 connected, the load mounting state determination unit 46 sets the output current IL from the variable constant current source 15.

  As described above, according to the third embodiment, the control unit corresponding to the connection information output from the information output unit 26 provided in each of the light emitting modules 13, here, the type of the light emitting module 13 or the number of connections. 16 makes the output current IL of the constant current power supply 12 variable, so that the driving of the LED lighting device 11 can be controlled in accordance with the state of the connected light emitting module 13.

  In addition, the information output unit 26 shares the main terminals 13a and 13b for supplying power from the constant current power supply 12 for outputting connection information, so that a terminal for information output is provided separately. , The configuration can be simplified.

  Next, FIG. 5 thru | or 7 shows 4th Embodiment, FIG. 5 is a circuit diagram of an illuminating device, FIG. 6 is a graph which shows the electrical property of the light source of an illuminating device, FIG. 7 shows operation | movement of an illuminating device. It is a graph. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fourth embodiment, in the light emitting module 13, a series circuit of an LED 23, a transistor 51, and a resistor 52 is formed between main terminals 13a and 13b. An information output resistor 53 as a resistor is connected in parallel.

  The transistor 51 is, for example, an NPN bipolar transistor, the collector is connected to the LED 23, the emitter is connected to the resistor 52, and the emitter potential is set by the resistor 52. The transistor 51 of the first light emitting module 13 connected to the constant current power supply 12 has a collector connected to the base. The bases of the transistors 51 of each light emitting module 13 are connected to each other via the output terminal 13f of the light emitting module 13, and the base potentials of the transistors 51 of each light emitting module 13 are set to the same potential. Therefore, these transistors 51 constitute a leveling circuit and are configured such that the lighting currents of the LEDs 23 flowing through all the light emitting modules 13 are the same current.

  The information output resistor 53 is set to a sufficiently large resistance value as compared with the LED 23 side so that a lighting current flowing through the LED 23 or the like can be secured during operation of the light emitting module 13.

  When the output voltage Vout supplied from the constant current power supply 12 is a voltage a smaller than the lighting voltage b of the LED 23 shown in FIG. 6 from when the LED lighting device 11 is started, that is, FIG. The connection information of the light emitting module 13, here, the number of connections of the light emitting module 13 is detected by the current flowing through the information output resistor 53 until time T 1 shown in FIG.

  That is, by increasing / decreasing the number of connections of the light emitting module 13, the number of information output resistors 53 connected in parallel to the constant current power supply 12 increases / decreases, so that the current value recognized by the control unit 16 is equal to the number of connections. Since it increases in proportion, the control unit 16 detects the number of connected light emitting modules 13 by reading this current value.

  Then, the control unit 16 sets the output current IL from the variable constant current source 15 of the constant current power source 12 corresponding to the recognized number of connected light emitting modules 13, and controls the driving of the LED lighting device 11.

  Thereafter, in each light emitting module 13, when the output voltage Vout supplied from the constant current power supply 12 becomes the lighting voltage b, each LED 23 is lit, and the lighting of these LEDs 23 is caused by the leveling action of the resistor 52 and the transistor 51. Uniform in all the light emitting modules 13.

  That is, the control unit 16 varies the output current IL of the constant current power supply 12 according to the connection information output from the information output unit 26 provided in each of the light emitting modules 13, here the number of connections of the light emitting modules 13. The driving of the LED lighting device 11 can be controlled in accordance with the state of the connected light emitting module 13.

  In addition, the control unit 16 reads from the time when the LED lighting device 11 is activated until the time T1, so that a series of activation sequences from when the LED lighting device 11 is activated until the LED 23 of each light emitting module 13 is lit. Since the connection information of the light emitting module 13 can be recognized automatically by simply activating the LED lighting device 11 during the operation, the LED lighting device does not require a separate time for recognizing the connection information of the light emitting module 13. 11 usability is improved.

  Furthermore, since the controller 16 recognizes the current flowing through the information output resistor 53 with the voltage a applied between the main terminals 13a and 13b as connection information of the light emitting module 13, the main terminals 13a and 13a of the light emitting module 13 are recognized. 13b can be easily shared as the information output unit 26.

  Next, FIG. 8 shows a fifth embodiment, and FIG. 8 is a graph showing an output voltage of a constant current power source of the lighting device. Since the basic configuration of the LED lighting device 11 is the same as that of the fourth embodiment, the same reference numerals are given and the description thereof is omitted.

  In the fifth embodiment, the constant current power supply 12 is subjected to PWM (Pulse Width Modulation) control. That is, the constant current power source 12 has alternately an on period T2 for supplying the lighting voltage b of the LED 23 and an off period T3 for supplying a voltage a lower than the lighting voltage b, and the on period T2 A ratio with the off period T3 is set as the duty ratio. The LED 23 is lit even during the off period T3.

  Then, the control unit 16 recognizes the current flowing through the information output resistor 53 by the voltage a generated in the off-period T3 of the PWM control at the constant current power supply 12, so that the control unit 16 recognizes the fourth embodiment. And the so-called hot plug in which the light emitting module 13 can be attached and detached while the LED lighting device 11 is energized.

  Further, the PWM control OFF period T3 of the constant current power supply 12 between the main terminals 13a and 13b, that is, the current flowing through the information output resistor 53 in a state where the voltage a is applied, the controller 16 is connected to the light emitting module 13 connection information. Therefore, the main terminals 13a and 13b of the light emitting module 13 can be easily shared as the information output unit 26.

  In each of the above embodiments, any light source other than the LED 23 can be used as the light source.

  Further, the connection information output from the information output unit 26 by the light emitting module 13 can be arbitrary information other than the number of connections of the light emitting module 13 and the like.

11 LED lighting device as a lighting device

12 Constant current power supply

13 Light emitting module

13a, 13b Main terminal

16 Control unit

23 LED as light source

26 Information output section

53 Information output resistance which is resistance

Claims (2)

With constant current power supply;
A light emitting module comprising: a pair of main terminals connectable to the constant current power source; and one or more light sources connected between the pair of main terminals;
An information output unit including a resistor connected between main terminals of the light emitting module and outputting connection information of the light emitting module;
A control unit for recognizing connection information of the light emitting module based on a current flowing through the resistor and controlling driving of the constant current power supply;
A lighting device characterized by comprising:   The control unit recognizes a current flowing through the resistor as connection information of the light emitting module in a state where a voltage applied between the main terminals by a constant current power source is lower than a voltage during lighting of a light source. The lighting device according to claim 1.

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