WO2012039205A1 - 照明装置用集積回路および照明装置 - Google Patents
照明装置用集積回路および照明装置 Download PDFInfo
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- WO2012039205A1 WO2012039205A1 PCT/JP2011/068074 JP2011068074W WO2012039205A1 WO 2012039205 A1 WO2012039205 A1 WO 2012039205A1 JP 2011068074 W JP2011068074 W JP 2011068074W WO 2012039205 A1 WO2012039205 A1 WO 2012039205A1
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- emitting diode
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- 238000001514 detection method Methods 0.000 claims description 30
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- 238000010992 reflux Methods 0.000 claims description 2
- 238000003491 array Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 3
- 230000020169 heat generation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 230000004397 blinking Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 230000005669 field effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the present invention is a lighting device in which a plurality of light emitting elements such as LEDs (Light Emitting ⁇ ⁇ Diodes) are assembled to form a single light source, and the light source can be controlled to light up to an arbitrary brightness.
- the present invention relates to an integrated circuit and a lighting device.
- each LED constituting an illuminating lamp composed of an assembly of LEDs has variations in forward voltage, so that the drive current varies, and consequently, the brightness also varies. Further, when the brightness of the LED varies, there is a problem that partial luminance unevenness occurs on the light emitting surface of the illuminating lamp, and the quality as the illuminating lamp is deteriorated.
- a configuration in which a constant current circuit is provided for each LED or for each series circuit in which a plurality of LEDs (about six) are connected in series is known. Yes.
- Each constant current circuit controls the current of each corresponding LED to be constant, thereby reducing variations in LED brightness.
- FIG. 4 shows a circuit configuration example of a conventional light emitting diode lighting system.
- a power source Vdd1 and a constant current circuit 1003 for lighting an LED array 1011 in which six LEDs 1 are connected in series are connected.
- Each LED 1 has a forward voltage drop (Vf) of 3.6 V (typ .: standard value) and emits white light.
- the constant current circuit 1003 controls the transistor 1006 so that a current determined by the voltage value of the reference voltage Vref and the resistance value of the resistor 1004 flows stably to the connected LED array.
- the voltage drop in the LED array 1011 is 21.6 V, which is the sum of Vf of each LED 1.
- the voltage value of Vdd1 is set to 30 V in consideration of variations in Vf of LED1, fluctuations in the power source, and the like.
- a power source Vdd2 and a constant current circuit 1003 for lighting an LED array 1012 in which six LEDs 2 are connected in series are connected.
- Each LED 2 has a forward voltage drop (Vf) of 2.1 V (typ.) And emits orange light.
- Vf forward voltage drop
- the voltage drop in the LED array 1012 is 12.6 V, which is the sum of Vf of each LED 2.
- the voltage value of Vdd2 is set to 20 V in consideration of variations in Vf of LED2, fluctuations in the power source, and the like.
- the conventional circuit system shown in FIG. 4 has a problem that a large number of power supplies are required and the cost is increased.
- the power supply voltage needs to be the same 30 V for Vdd1 and Vdd2.
- the voltage applied to the constant current circuit 1003 on the lighting circuit 1002 side simply rises by 10V. Therefore, the constant current circuit 1003 changes the output voltage of the operational amplifier as the comparator 1005 and changes the gate voltage of the transistor 1006 so that the current flowing through the resistor 1004 does not change, thereby changing the on-resistance of the transistor 1006.
- the current consumed by the transistor 1006 increases and heat generation increases.
- the cathode is shared.
- Patent Document 2 in a color sequential LED driving circuit in which R, G, and B LEDs are sequentially turned on, the anode voltage is common, so it is wasted that it is consumed as heat.
- a technique for preventing power is disclosed.
- the color sequential LED driving circuit disclosed in Patent Document 2 is provided with a circuit that can output an optimum anode voltage for the lighting LED between the power supply circuit and the anode of the LED, and this circuit is switched by the lighting LED.
- the present invention has been made in view of the above-mentioned problems, and its object is to make it possible to suppress heat generation at low cost when LEDs having different Vf are lit with a common anode voltage.
- An object is to provide an integrated circuit for a device and a lighting device.
- an integrated circuit for a lighting device includes a first light emitting diode system including one light emitting diode or a plurality of light emitting diodes connected in series, and one light emitting diode. Or at least a second light emitting diode system in which a plurality of light emitting diodes are connected in series, and an end on the anode side of the first light emitting diode system is an anode of the second light emitting diode system The light emitting wavelength of each light emitting diode constituting the first light emitting diode system is different from the light emitting wavelength of each light emitting diode constituting the second light emitting diode system.
- An integrated circuit for driving a diode group the first constant current driving circuit for controlling a current for driving the first light emitting diode system
- a second constant current driving circuit for controlling a current for driving the second light emitting diode system
- the first constant current driving circuit drives the first light emitting diode system with a steady current.
- the second constant current drive circuit drives the second light emitting diode system with an intermittent current and a regenerative current
- the first constant current drive circuit drives the first light emitting diode system to be driven.
- each light emitting diode It is possible to adjust the luminance of each light emitting diode by adjusting the lighting time of each light emitting diode constituting the second light emitting diode, and the second constant current driving circuit is configured to drive the second light emitting diode to be driven.
- the lighting time of each light emitting diode constituting the system By adjusting the lighting time of each light emitting diode constituting the system, the brightness of each light emitting diode can be adjusted.
- the lighting device of the present invention includes a first power supply line, a second power supply line, and one light emitting diode, or a plurality of light emitting diodes connected in series.
- a first constant current drive circuit that controls a current that drives the first light emitting diode system
- a second constant current drive circuit that controls a current that drives the second light emitting diode system
- the first constant current driving circuit includes a first transistor having a source, a drain, and a gate, and a first transistor connected to the source of the first transistor.
- a first resistor having a second terminal connected to the second power supply line, a voltage value detected at the source of the first transistor, and a first reference voltage.
- a first amplifier having an input and an output terminal connected to the gate of the first transistor; and the second constant current driving circuit includes a second transistor having a source, a drain, and a gate; A second resistor comprising a first terminal connected to the source of the second transistor and a second terminal connected to the second power supply line; and a source of the second transistor.
- the first power supply line includes an anode side end of the first light emitting diode system and an anode side end of the second light emitting diode system.
- a cathode side end of the first light emitting diode system is connected to a drain of the first transistor, and the second light emitting diode system has a cathode side end connected to the drain of the first transistor.
- An end on the cathode side is connected to a first terminal of the inductance, and a second terminal of the inductance is connected to a drain of the second transistor and an anode of the freewheeling diode.
- the light emission wavelength of each light emitting diode constituting the first light emitting diode system is the light emission wavelength of each light emitting diode constituting the second light emitting diode system.
- the first amplifier, the second amplifier, and the pulse wave generation circuit are provided in an integrated circuit, and the integrated circuit constitutes the first light emitting diode system.
- the lighting device of the present invention has a common end on the anode side of a plurality of light emitting diode systems, and is provided with a circuit capable of driving the plurality of light emitting diode systems. .
- the above circuit is configured to include two light emitting diode drive circuits.
- One of the two driving circuits performs driving by constant current driving of the light emitting diode system, and the other performs constant current driving and pulse driving of the light emitting diode system.
- Vf when a plurality of light emitting diode systems having different forward drop voltages Vf are driven with the anode end shared (that is, the same power supply voltage is applied), Vf is high.
- One light emitting diode system is driven by direct current, while the light emitting diode system having the lower Vf can be driven by constant current and pulse driving.
- heat generation does not occur while the second transistor is open, so that the lighting device of the present invention can suppress heat generation.
- the integrated circuit for lighting device of the present invention has a configuration including two light emitting diode drive circuits.
- One of the two driving circuits performs driving by constant current driving of the light emitting diode system, and the other performs constant current driving and pulse driving of the light emitting diode system.
- the lighting device in a lighting device having a plurality of light emitting diode systems, the lighting device can suppress heat generation at low cost by applying the integrated circuit for lighting device of the present invention. Can be realized.
- the integrated circuit for a lighting device of the present invention includes one light-emitting diode, or includes a first light-emitting diode system in which a plurality of light-emitting diodes are connected in series and one light-emitting diode, or A second light emitting diode system in which a plurality of light emitting diodes are connected in series, and an anode side end of the first light emitting diode system is connected to an anode side end of the second light emitting diode system.
- the light emitting wavelength of each light emitting diode composing the first light emitting diode system is driven in common and the light emitting diode group is different from the light emitting wavelength of each light emitting diode composing the second light emitting diode system.
- a first constant current driving circuit for controlling a current for driving the first light emitting diode system;
- a second constant current drive circuit for controlling a current for driving the photodiode system, wherein the first constant current drive circuit drives the first light emitting diode system with a steady current, and
- the constant current drive circuit drives the second light emitting diode system with an intermittent current and a regenerative current, and the first constant current drive circuit emits light that constitutes the first light emitting diode system to be driven.
- the lighting time of the diodes By adjusting the lighting time of the diodes, it is possible to adjust the luminance of each of these light emitting diodes, and the second constant current driving circuit is configured so that each of the second light emitting diode systems to be driven is configured. By adjusting the lighting time of the light emitting diodes, the luminance of each of these light emitting diodes can be adjusted.
- the lighting device of the present invention includes a first light-emitting diode system including a first power supply line, a second power supply line, and a single light-emitting diode, or a plurality of light-emitting diodes connected in series.
- a second light-emitting diode system comprising one light-emitting diode or a plurality of light-emitting diodes connected in series, an inductance having a first terminal and a second terminal, a free-wheeling diode, and the first light-emitting diode
- a first constant current driving circuit for controlling a current for driving the diode system; and a second constant current driving circuit for controlling a current for driving the second light emitting diode system.
- the circuit includes a first transistor having a source, a drain, and a gate; a first terminal connected to a source of the first transistor; and the second transistor
- a first resistor having a second terminal connected to a source line, a voltage value detected at the source of the first transistor, and a first reference voltage are input, and an output terminal is the first terminal.
- a first amplifier connected to the gate of one transistor, and the second constant current driving circuit includes a second transistor having a source, a drain, and a gate, and a source of the second transistor.
- a second resistor comprising a first terminal connected to the second power supply line and a second terminal connected to the second power supply line; a voltage value detected at the source of the second transistor; A second amplifier whose input terminal is connected to the gate of the second transistor and a pulse for controlling whether or not to operate the second amplifier is generated, and Supply to second amplifier
- the first power supply line includes an anode-side end of the first light-emitting diode system, an anode-side end of the second light-emitting diode system, and the free-wheeling diode.
- the cathode side end of the first light emitting diode system is connected to the drain of the first transistor, and the cathode side end of the second light emitting diode system is A first terminal of the inductance is connected, and a second terminal of the inductance is connected to a drain of the second transistor and an anode of the freewheeling diode, and the first light emitting diode system is connected to the first terminal of the inductance.
- the light emission wavelength of each light emitting diode constituting is different from the light emission wavelength of each light emitting diode constituting the second light emitting diode system
- the first amplifier, the second amplifier, and the pulse wave generation circuit are provided in an integrated circuit, and the integrated circuit determines the lighting time of each light-emitting diode that constitutes the first light-emitting diode system.
- the present invention has an effect that it is possible to suppress heat generation at low cost when LEDs having different Vf are lit with a common anode voltage.
- FIG. 1 is a circuit diagram showing a configuration of a light emitting diode lighting system (illumination device) 100 according to the present embodiment.
- the light emitting diode lighting system 100 includes a lighting circuit 101 and a lighting circuit 102.
- the lighting circuit 101 includes an LED array (first light emitting diode system) 1011 in which six LEDs 1 are connected in series, and a constant current circuit (first constant current drive circuit) 1003.
- the lighting circuit 102 includes an LED array (second light emitting diode system) 1012 in which six LEDs 2 are connected in series, and a constant current control circuit (second constant current drive circuit) 3.
- the anode of one LED and the cathode of the other LED are connected. Accordingly, one end of the LED array corresponds to the anode of the LED in which only the cathode is connected to the other LED, and this end is hereinafter referred to as an “anode-side end”. Similarly, the other end of the LED array corresponds to the cathode of an LED in which only the anode is connected to the other LED, and this end is hereinafter referred to as the “cathode side end”.
- each LED 1 has, for example, a forward voltage drop (Vf) of 3.6 V (typ.) And emits white light.
- each LED 2 has, for example, a forward voltage drop (Vf) of 2.1 V (typ.) And emits orange light.
- the end of the LED array 1011 on the anode side is connected to a power supply (first power supply line) Vdd. Further, the end of the LED array 1012 on the anode side is also connected to the power supply Vdd. That is, the LED array 1011 and the LED array 1012 have an anode side end common to each other, and a power supply voltage (for example, 30 V) from a common power supply Vdd is applied.
- a power supply voltage for example, 30 V
- the cathode side end of the LED array 1011 is connected to a constant current circuit 1003.
- the constant current circuit 1003 includes a resistor (first resistor) 1004, a comparator (first amplifier) 1005, and a transistor (first transistor) 1006.
- each transistor 1006 is an n-channel power MOSFET (Metal-Oxide-Semiconductor-Field-Effect-Transistor: metal oxide semiconductor field effect transistor), and has a source (first terminal), a drain (second terminal), and A gate (third terminal) is provided.
- the end of the LED array 1011 on the cathode side is specifically connected to the drain of the transistor 1006.
- the source of the transistor 1006 is connected to one end (first terminal) of the resistor 1004 (a series circuit of the first transistor and the first resistor).
- the other end (second terminal) of the resistor 1004 is connected to a second power supply line having a lower potential than the power supply voltage from the power supply Vdd.
- the other end of the resistor 1004 is grounded, and the connection to the second power supply line is achieved by this grounding.
- the source of the transistor 1006 is further connected to one input terminal of the comparator 1005.
- the other input terminal of the comparator 1005 is connected to a power supply line that generates the reference voltage Vref.
- the output terminal of the comparator 1005 is connected to the gate of the transistor 1006.
- the constant current circuit 1003 controls the transistor 1006 so that the current determined by the voltage value of the reference voltage Vref and the resistance value of the resistor 1004 flows to the LED array 1011 stably, similarly to that of FIG.
- the end of the LED array 1012 on the cathode side is connected to the constant current control circuit 3.
- the constant current control circuit 3 includes a resistor (second resistor) 1004, a transistor (second transistor) 1006, an operational amplifier (second amplifier) 5, a coil (inductance) 6, a diode (freewheeling diode) 7, and a pulse wave A generation circuit 8 is provided. Specifically, the cathode side end of the LED array 1012 is connected to one end (first terminal) of the coil 6.
- the other end (second terminal) of the coil 6 is connected to the drain of the transistor 1006 which is an n-channel power MOSFET and the anode of the diode 7.
- the cathode of the diode 7 is connected to the power supply Vdd.
- the source of the transistor 1006 is connected to one end (first terminal) of the resistor 1004 (in the series of the second transistor and the second resistor), similarly to the configuration of the constant current circuit 1003. Circuit), the other end (second terminal) of the resistor 1004 is connected to the second power supply line (here, grounded).
- the source of the transistor 1006 is further connected to one input terminal of the operational amplifier 5.
- the other input terminal of the operational amplifier 5 is connected to a power supply line that generates a reference voltage Vref.
- the output terminal of the operational amplifier 5 is connected to the gate of the transistor 1006.
- a pulse wave generation circuit 8 is connected to the operational amplifier 5.
- the pulse wave generation circuit 8 generates a pulse for switching the operation state and the stop state of the operational amplifier 5 and supplies the pulse to the operational amplifier 5.
- the operational amplifier 5 operates when a high-level pulse is input from the pulse wave generation circuit 8, and turns off the transistor 1006 during this pulse input when a low-level pulse is input from the pulse wave generation circuit 8. Thus, the operation is stopped.
- the operation of the operational amplifier 5 in the operating state is the same as the operation of the comparator 1005 described above.
- the constant current control circuit 3 performs time-division driving based on the frequency of the pulse generated by the pulse wave generation circuit 8 in the operation of the constant current circuit 1003 (that is, the operation state and the stop state of the operational amplifier 5 according to the logic of this pulse). This is a circuit provided with an operation for switching between (1) and (2). That is, the constant current control circuit 3 uses the output of the operational amplifier 5 as a pulse signal according to the pulse generated by the pulse wave generation circuit 8, and controls the opening / closing (on / off) of the transistor 1006 based on this pulse signal. is there.
- the lighting circuit 101 When the voltage value of the power supply Vdd is 30 V, the lighting circuit 101 is in the same state as when the power supply voltage from the power supply Vdd1 is applied to the lighting circuit 1001 shown in FIG. On the other hand, in this case, in the lighting circuit 102, a voltage higher than necessary (20V) is applied to the constant current generating circuit. Therefore, when the constant current circuit 1003 is used as the constant current generating circuit, a problem of heat generation occurs.
- a pulse is supplied from the pulse wave generation circuit 8 to the operational amplifier 5. Then, the operational amplifier 5 controls the opening and closing of the transistor 1006 based on the pulse by a pulse signal, thereby generating a period of time for the transistor 1006 to open.
- the lighting circuit 102 is provided with a coil 6 and a diode 7.
- the coil 6 stores energy when the transistor 1006 of the constant current control circuit 3 operates, and generates a regenerative current by releasing the energy when the transistor 1006 is opened. This regenerative current flows to the LED array 1012 and drives the LED array 1012.
- each LED 2 can be turned on by the energy stored in the coil 6 even when the transistor 1006 is opened, so that each LED 2 can be turned on without blinking.
- the energy stored in the coil 6 is the power that was wasted in the conventional light emitting diode lighting system shown in FIG. 4 due to current limitation.
- the light emitting diode lighting system 100 uses such previously wasted power for driving the LED array 1012, it is possible to realize a lighting circuit 102 with low power consumption and low heat generation. It is.
- the period between the period in which the constant current control circuit 3 is operated and the period in which the constant current control circuit 3 is not operated that is, one period of the pulse from the pulse wave generation circuit 8 is longer than the period in which each LED 2 is lit by the regenerative current of the coil 6. It is necessary to set it short.
- the frequency of the pulse from the pulse wave generation circuit 8 is between 150 kHz and 300 kHz.
- the constant current circuit 1003 and the constant current control circuit 3 can be realized on one integrated circuit.
- the integrated circuit includes first to fourth terminals arranged as follows.
- Second terminal Between the source of the transistor 1006 and one input terminal of the comparator 1005 in the constant current circuit 1003.
- an LED array 1011 in which six LEDs 1 are connected in series is used as the first light emitting diode system.
- the number of LEDs 1 in the first light emitting diode system is not limited to six, and may be any number as long as it is one or more (the same applies to the embodiments described later).
- an LED array 1012 in which six LEDs 2 are connected in series is used as the second light emitting diode system.
- the number of LEDs 2 in the second light emitting diode system is not limited to six, and may be any number as long as it is one or more (the same applies to the embodiments described later).
- the anode end is the anode of the LED itself and the cathode end is the LED cathode itself.
- the transistor 1006 may be a p-channel power MOSFET, a bipolar transistor, or the like instead of the n-channel power MOSFET.
- the transistor 1006 may be provided between a corresponding resistor 1004 (existing in the same block) and the second power supply line.
- the coil 6 only needs to form a loop among the power supply Vdd, the diode 7, and the LED array 1012.
- the power supply Vdd And the LED array 1012 may be connected.
- FIG. 2 is a circuit diagram showing a configuration of a light emitting diode lighting system (illumination device) 120 according to the present embodiment.
- the light emitting diode lighting system 120 is different from the light emitting diode lighting system 100 (see FIG. 1) in the following points.
- the light emitting diode lighting system 120 includes lighting circuits 121 and 122 instead of the lighting circuits 101 and 102 of the light emitting diode lighting system 100.
- the lighting circuit 121 includes a constant current circuit 24 instead of the constant current circuit 1003 of the lighting circuit 101.
- the lighting circuit 122 includes a constant current control circuit 23 instead of the constant current control circuit 3 of the lighting circuit 102.
- the constant current circuit 24 is different from the constant current circuit 1003 in that it includes an operational amplifier 26 and a PWM wave generation circuit 29 instead of the comparator 1005.
- the operational amplifier 26 has one input terminal connected to the source of the transistor 1006, the other input terminal connected to the power supply line that generates the reference voltage Vref, and the output terminal connected to the gate of the transistor 1006. . Further, the PWM wave generation circuit 29 is connected to the operational amplifier 26.
- the constant current control circuit 23 is different from the constant current control circuit 3 in that it includes an operational amplifier 25 and a PWM wave generation circuit (pulse wave generation circuit) 28 instead of the operational amplifier 5 and the pulse wave generation circuit 8.
- the operational amplifier 25 has one input terminal connected to the source of the transistor 1006, the other input terminal connected to the power supply line that generates the reference voltage Vref, and the output terminal connected to the gate of the transistor 1006. . Further, the PWM wave generation circuit 28 is connected to the operational amplifier 25.
- PWM wave generation circuits 28 and 29 generate pulses subjected to pulse width modulation (hereinafter referred to as PWM signals) and supply them to operational amplifiers 25 and 26, respectively.
- the operational amplifiers 25 and 26 are switched between an operating state (for example, when the PWM signal is at a high level) and a stopped state (for example, when the PWM signal is at a low level) according to the logic of the supplied PWM signal.
- the LED lighting system 120 has a common anode side end of the LED arrays 1011 and 1012 and is a circuit for lighting two LEDs. It is possible to perform toning.
- the lighting circuit 121 lights the LED array 1011 composed of the LEDs 1 that emit white light in accordance with the control by the constant current circuit 24, as in the lighting circuit 101 of FIG.
- the constant current circuit 24 is provided with a PWM wave generating circuit 29.
- the PWM wave generation circuit 29 generates a PWM signal that can set the pulse width of the high level signal and the pulse width of the low level signal, and supplies the PWM signal to the operational amplifier 26.
- the operational amplifier 26 performs normal constant current driving when the PWM signal is at a high level. However, when the PWM signal is at a low level, the operational amplifier 26 opens the transistor 1006 so that no current flows through the constant current circuit 24.
- the LED array 1011 is turned on when the PWM signal is at a high level, and is turned off when the PWM signal is at a low level. Based on the logic of the PWM signal, when the cycle of turning on and off the LED 1 is short (in the light emitting diode lighting system 120 of FIG. 2, it is set between 200 Hz and 1 kHz), the blinking of the LED 1 can be recognized by human eyes. First, it feels as if the light emission luminance of LED 1 has changed.
- the lighting circuit 122 lights the LED array 1012 composed of the LEDs 2 that emit orange light in accordance with the control by the constant current control circuit 23, similarly to the lighting circuit 102 of FIG.
- the constant current control circuit 23 is provided with a PWM wave generation circuit 28 instead of the pulse wave generation circuit 8.
- the PWM wave generation circuit 28 generates a pulse signal (hereinafter referred to as “PWMH period”) and a period during which no pulse signal is generated (hereinafter referred to as “PWML”). (Referred to as “period”) at a constant cycle.
- the LED array 1012 is turned on as in the case of FIG. 1, but in the PWML period, the transistor 1006 is kept open, so the LED array 1012 is turned off.
- the lighting periods of the LED arrays 1011 and 1012 can be adjusted by the PWM wave generation circuit 29 and the PWM wave generation circuit 28, respectively, and color adjustment can be performed by adjusting the lighting period. .
- the orange color of the LED array 1012 is gradually added while the LED array 1011 is dimmed.
- the light emitting diode lighting system 120 it is possible to perform a color setting such that the light gradually changes from white daylight white to a light bulb color.
- FIG. 3 is a circuit block diagram showing a configuration of a light-emitting diode lighting system (illumination device) including the LED driver (illumination device integrated circuit) 31 according to the present embodiment.
- FIG. 3 shows that each of the three light emitting diode systems can be obtained by using an LED driver IC (Integrated Circuit) having three constant current circuits (constant current control circuits) for lighting the light emitting diode systems. It is an example of a structure of the LED lighting apparatus which enabled the toning.
- LED driver IC Integrated Circuit
- constant current circuits constant current control circuits
- the LED driver 31 includes a constant current control amplifier (first constant current drive circuit) 32 for lighting the LED, one circuit (CH1: first system), and a chopping type PWM generation circuit for lighting the LED + constant current control.
- first constant current drive circuit for lighting the LED
- CH1 first system
- chopping type PWM generation circuit for lighting the LED + constant current control.
- This is an integrated circuit including two amplifiers (second constant current drive circuit) 33 (CH2: second system, and CH3: third system).
- the chopping PWM generation circuit + constant current control amplifier 33 is simply referred to as a circuit 33.
- the terminal VOUT1 (first terminal) is an output terminal of the constant current control amplifier 32 for CH1
- the terminal VOP_SENSE1 (second terminal) is an input terminal for an open state detection signal for CH1.
- the terminal VOUT2 (third terminal) is an output terminal of the CH2 circuit 33
- the terminal VOP_SENSE2 (fourth terminal) is an input terminal for an open state detection signal of CH2.
- the terminal VOUT3 is an output terminal of the CH3 circuit 33
- the terminal VOP_SENSE3 is an input terminal for an open state detection signal of CH3.
- the gate of the transistor (first transistor) 1006 is connected to the terminal VOUT ⁇ b> 1 according to the same connection procedure as in FIG. 2, and between the source of the transistor 1006 and GND (second power supply line), A resistor (first resistor) 1004 that is a sense resistor is inserted. Then, by connecting the connection point between the source of the transistor 1006 and the resistor 1004 to the terminal VOP_SENSE1, a constant current can be supplied to the LED array 1011 (CH1). The same applies to CH2 and CH3.
- the CH2 circuit 33 includes a chopping type PWM as a common anode voltage of each light emitting diode system.
- the generation circuit is built-in. For this reason, the LED driver 31 can be used for toning with a single chip.
- the operation of the chopping type PWM generation circuit is the same as the operation of the PWM wave generation circuit 28 described in the light emitting diode lighting system 120 of FIG.
- the LED driver 31 includes a chopping-type PWM generation circuit and a constant current control amplifier for LED lighting, one system (CH3) more than the light-emitting diode lighting system 120 (see FIG. 2). While CH1 and CH2 perform normal illumination control, applications such as using CH3 for lighting control of the nightlight LED are conceivable.
- the current values for driving the LED arrays 1011 and 1012 and one LED 3 are the sense resistors connected to the terminals VOP_SENSE1 to VOP_SENSE3, that is, the resistances Set at 1004.
- the constant current control amplifier 32 and the circuit 33 adjust their outputs so that the voltages at the terminals VOP_SENSE1 to VOP_SENSE3, which are generated when the LED drive current flows through the resistors 1004, become a specified voltage level of 200 mV. Yes.
- the voltage level specified above is specified by the resistance values of the resistor RSET (x1) and the resistor RSET (x3) connected to the terminals RSET0 to RSET3, respectively.
- the resistance RSET (x1) of the terminal RSET0 is 625 ⁇
- the resistance RSET (x3) of the terminals RSET1 to 3 is 10 ⁇
- the above specified voltage level is Is represented by the following formula.
- the following resistance values are examples, and any values that satisfy the following relationship may be used.
- the chopping frequencies of CH2 and CH3 are generated by a triangular wave generation circuit 34 that is an oscillation circuit built in the circuit 33.
- the frequency range of the triangular wave generating circuit 34 corresponds to 150 kHz to 300 kHz, and the frequency can be changed by a resistor Rfreq connected between the terminal FOSC1 and the terminal FOSC2.
- the constant current control amplifier 32 and the circuit 33 have a PWM_IN input terminal (not shown), and can individually input a PWM dimming signal obtained by pulse width modulation from the outside.
- the constant current control amplifier 32 and the circuit 33 pulse drive the transistors 1006 connected to the cathode side ends of the LED arrays 1011 and 1012 connected in series and the cathode of the LED 1013, respectively.
- the constant current control amplifier 32 and the circuit 33 can perform dimming of the corresponding LED arrays 1011 and 1012 and the LED 1013 without changing the current value.
- the specifications of the PWM dimming signal that can be supported by the LED driver 31 are as follows.
- the LED driver 31 has a thermal error detection function, an open state detection function for each light emitting diode system, and a short detection function for each light emitting diode system as error detection and protection functions.
- the control logic 36 determines that a thermal error state has occurred, and all current drivers Includes a function to turn off.
- the thermal error detection function includes a function of setting the output voltage V_FBOUT of the error amplifier 37 to 0 V when the control logic 36 determines that the thermal error state has occurred.
- the function of detecting the open state of the light emitting diode system is that a voltage input to at least one of the terminals VOP_SENSE 1 to 3 is a constant voltage during a period in which the constant current control amplifier 32 and the circuit 33 are operating (LED lighting state). Works when below. In the present embodiment, for example, this constant voltage is set to 100 mV (typ.). In this case, the voltage drop is detected by the LED string open detection circuit (open detection circuit) 38. The LED string open detection circuit 38 determines that the light emitting diode system is in an open state based on the detection of the voltage drop, and notifies the control logic 36 of the error detection.
- the control logic 36 turns off the constant current drivers of all CHs and turns off the error amplifier 37. Further, when detecting the open state of CH2 (LED array 1012) or CH3 (LED3), the control logic 36 turns off only the constant current driver of the CH in the open state, and the error amplifier 37 remains in the ON state (continues output). ).
- the short-circuit detecting function of the light emitting diode system is such that the voltage input to the terminal VSH_SENSE (1, 2, 3) is a constant voltage during the period in which the constant current control amplifier 32 and the circuit 33 are operating (LED lighting state). It works when exceeding.
- this constant voltage is set to 3.25 V (typ.).
- an increase in voltage is detected by the LED string short detection circuit (short detection circuit) 39.
- the LED string short-circuit detection circuit 39 determines that the light-emitting diode system is short-circuited by detecting this voltage rise, and notifies the control logic 36 of the detection of the error. Then, the control logic 36 turns off the constant current drivers for all channels and turns off the error amplifier 37 when a short circuit is detected.
- the LED driver 31 may include only one of the LED string open detection circuit 38 and the LED string short detection circuit 39.
- the output voltage V_FBOUT is an output voltage of the error amplifier 37 for feedback control to an external DC / DC converter (not shown) having the terminal VSH_SENSE (1, 2, 3) as an input.
- a voltage generated by dividing the anode voltage supplied from the external DC / DC converter (in this embodiment, set to 2 V) is input to the terminal VSH_SENSE (1, 2, 3). Since the error amplifier outputs the input voltage of the terminal VSH_SENSE (1, 2, 3) as it is as the value of the output voltage V_FBOUT, the external DC / DC converter can perform control using this value as a feedback value. .
- the LED driver 31 drives a light emitting diode group including at least the LED arrays 1011 and 1012 having a common end on the anode side and different light emission wavelengths of the LEDs.
- the LED driver 31 includes a constant current control amplifier 32 that drives the LED array 1011 with a steady current, and a circuit 33 that drives the LED array 1012 with an intermittent current and a regenerative current. Furthermore, the constant current control amplifier 32 and the circuit 33 can easily adjust the luminance of each light emitting diode by adjusting the lighting time of each light emitting diode constituting the corresponding LED array 1011 or 1012. It is.
- a light emitting diode lighting system 120 including a plurality of light emitting diode systems (which may be the light emitting diode lighting system 100), by applying the LED driver 31, it is possible to suppress heat generation at low cost.
- a diode lighting system can be realized.
- the constant current control amplifier 32 may correspond to the comparator 1005, and the circuit 33 may correspond to the operational amplifier 5 and the pulse wave generation circuit 8.
- the constant current control amplifier 32 may correspond to the operational amplifier 26 and the circuit 33 may correspond to the operational amplifier 25 and the PWM wave generation circuits 28 and 29.
- a power MOSFET and a resistor can be connected to the first constant current drive circuit from the outside of the integrated circuit, and the second constant current drive circuit includes A power MOSFET, a resistor, an inductance, and a diode are preferably connectable from the outside of the integrated circuit.
- the integrated circuit for lighting device of the present invention is characterized by including a short detection circuit for detecting a short circuit of each light emitting diode system.
- the integrated circuit can detect a short circuit of each light emitting diode system.
- the integrated circuit for lighting device of the present invention is characterized by comprising an open detection circuit for detecting an open state of each of the light emitting diode systems.
- the integrated circuit can detect the open state of each light emitting diode system.
- the present invention relates to a lighting device and an integrated circuit for a lighting device in which a plurality of light emitting elements such as LEDs are assembled to constitute a single light source, and the light source can be controlled to be controlled to an arbitrary brightness using the illumination light. Is available.
- Constant current control circuit (second constant current drive circuit) 5 Operational amplifier (second amplifier) 6 Coil (inductance) 7 Diode (reflux diode) 8 Pulse wave generation circuit 25 Operational amplifier (second amplifier) 26 Operational amplifier (first amplifier) 28 PWM wave generation circuit (pulse wave generation circuit) 31 LED driver (integrated circuit for lighting device) 32 constant current control amplifier (first constant current drive circuit) 33 Chopping PWM generation circuit + constant current control amplifier (second constant current drive circuit) 38 LED string open detection circuit (open detection circuit) 39 LED string short detection circuit (short detection circuit) 100 Light-emitting diode lighting system (lighting device) 120 Light-emitting diode lighting system (lighting device) 1003 Constant current circuit (first constant current drive circuit) 1004 Resistance (first resistance, second resistance) 1005 Comparator (first amplifier) 1006 Transistors (first transistor, second transistor, power MOSFET) 1011 LED array (first light emitting diode system) 1012 LED array (second light emitting diode system)
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Abstract
Description
図1は、本実施の形態に係る発光ダイオード点灯システム(照明装置)100の構成を示す回路図である。
図2は、本実施の形態に係る発光ダイオード点灯システム(照明装置)120の構成を示す回路図である。
図3は、本実施の形態に係るLEDドライバ(照明装置用集積回路)31を備える、発光ダイオード点灯システム(照明装置)の構成を示す回路ブロック図である。
=基準電流×RSET1~3(10Ω)
=(1.25V/RSET0(625Ω))×RSET1~3(10Ω)
=200mV
また、CH2およびCH3のチョッピング周波数は、回路33に内蔵している発振回路である、三角波発生回路34で生成している。三角波発生回路34の周波数レンジは、150kHzから300kHzまでに対応しており、端子FOSC1と端子FOSC2との間に接続された抵抗Rfreqにより、周波数が変更可能である。
PWM On duty:1.0%~100%
また、LEDドライバ31は、エラー検出および保護機能として、サーマルエラー検出機能、各発光ダイオード系統のオープン状態の検出機能、および各発光ダイオード系統のショートの検出機能を備えている。
5 オペアンプ(第2のアンプ)
6 コイル(インダクタンス)
7 ダイオード(還流ダイオード)
8 パルス波発生回路
25 オペアンプ(第2のアンプ)
26 オペアンプ(第1のアンプ)
28 PWM波発生回路(パルス波発生回路)
31 LEDドライバ(照明装置用集積回路)
32 定電流制御アンプ(第1の定電流駆動回路)
33 チョッピング型PWM発生回路+定電流制御アンプ(第2の定電流駆動回路)
38 LED列オープン検出回路(オープン検出回路)
39 LED列ショート検出回路(ショート検出回路)
100 発光ダイオード点灯システム(照明装置)
120 発光ダイオード点灯システム(照明装置)
1003 定電流回路(第1の定電流駆動回路)
1004 抵抗(第1の抵抗、第2の抵抗)
1005 比較器(第1のアンプ)
1006 トランジスタ(第1のトランジスタ、第2のトランジスタ、パワーMOSFET)
1011 LEDアレイ(第1の発光ダイオード系統)
1012 LEDアレイ(第2の発光ダイオード系統)
Claims (5)
- 1つの発光ダイオードから成るか、または複数の発光ダイオードが直列接続されて成る第1の発光ダイオード系統と、
1つの発光ダイオードから成るか、または複数の発光ダイオードが直列接続されて成る第2の発光ダイオード系統とを少なくとも備え、
上記第1の発光ダイオード系統のアノード側の端部は、上記第2の発光ダイオード系統のアノード側の端部と共通化されており、
上記第1の発光ダイオード系統を構成する各発光ダイオードの発光波長は、上記第2の発光ダイオード系統を構成する各発光ダイオードの発光波長と異なっている発光ダイオード群を駆動する集積回路であって、
上記第1の発光ダイオード系統を駆動する電流を制御する第1の定電流駆動回路と、
上記第2の発光ダイオード系統を駆動する電流を制御する第2の定電流駆動回路とを備え、
上記第1の定電流駆動回路は、上記第1の発光ダイオード系統を、定常電流により駆動し、
上記第2の定電流駆動回路は、上記第2の発光ダイオード系統を、間欠電流と回生電流とにより駆動し、
上記第1の定電流駆動回路は、駆動すべき上記第1の発光ダイオード系統を構成する各発光ダイオードの点灯時間を調節することにより、これらの各発光ダイオードの輝度を調節することが可能であり、
上記第2の定電流駆動回路は、駆動すべき上記第2の発光ダイオード系統を構成する各発光ダイオードの点灯時間を調節することにより、これらの各発光ダイオードの輝度を調節することが可能であることを特徴とする集積回路。 - 上記第1の定電流駆動回路には、集積回路の外部から、パワーMOSFETおよび抵抗が接続可能であり、
上記第2の定電流駆動回路には、集積回路の外部から、パワーMOSFET、抵抗、インダクタンス、およびダイオードが接続可能であることを特徴とする請求項1に記載の集積回路。 - 各上記発光ダイオード系統のショートを検出するショート検出回路を備えることを特徴とする請求項1または2に記載の集積回路。
- 各上記発光ダイオード系統のオープン状態を検出するオープン検出回路を備えることを特徴とする請求項1または2に記載の集積回路。
- 第1の電源ラインと、第2の電源ラインと、
1つの発光ダイオードから成るか、または複数の発光ダイオードが直列接続されて成る第1の発光ダイオード系統と、1つの発光ダイオードから成るか、または複数の発光ダイオードが直列接続されて成る第2の発光ダイオード系統と、
第1の端子および第2の端子を備えるインダクタンスと、
還流ダイオードと、
上記第1の発光ダイオード系統を駆動する電流を制御する第1の定電流駆動回路と、
上記第2の発光ダイオード系統を駆動する電流を制御する第2の定電流駆動回路とを備え、
上記第1の定電流駆動回路は、
ソース、ドレイン、およびゲートを備える第1のトランジスタと、
上記第1のトランジスタのソースに接続されている第1の端子と、上記第2の電源ラインに接続されている第2の端子とを備える第1の抵抗と、
上記第1のトランジスタのソースで検知される電圧値と、第1の基準電圧とを入力とし、出力端が上記第1のトランジスタのゲートに接続されている第1のアンプとを備え、
上記第2の定電流駆動回路は、
ソース、ドレイン、およびゲートを備える第2のトランジスタと、
上記第2のトランジスタのソースに接続されている第1の端子と、上記第2の電源ラインに接続されている第2の端子とを備える第2の抵抗と、
上記第2のトランジスタのソースで検知される電圧値と、第2の基準電圧とを入力とし、出力端が上記第2のトランジスタのゲートに接続されている第2のアンプと、
上記第2のアンプを動作させるか否かを制御するパルスを生成し、上記第2のアンプに供給するパルス波発生回路とを備え、
上記第1の電源ラインは、上記第1の発光ダイオード系統のアノード側の端部、上記第2の発光ダイオード系統のアノード側の端部、および上記還流ダイオードのカソードに接続されており、
上記第1の発光ダイオード系統のカソード側の端部は、上記第1のトランジスタのドレインに接続されており、
上記第2の発光ダイオード系統のカソード側の端部は、上記インダクタンスの第1の端子に接続されており、
上記インダクタンスの第2の端子は、上記第2のトランジスタのドレイン、および上記還流ダイオードのアノードに接続されており、
上記第1の発光ダイオード系統を構成する各発光ダイオードの発光波長は、上記第2の発光ダイオード系統を構成する各発光ダイオードの発光波長と異なっており、
上記第1のアンプ、上記第2のアンプ、および上記パルス波発生回路は、集積回路に設けられており、
上記集積回路は、
上記第1の発光ダイオード系統を構成する各発光ダイオードの点灯時間を調節することにより、これらの各発光ダイオードの輝度を調節することが可能であり、
上記第2の発光ダイオード系統を構成する各発光ダイオードの点灯時間を調節することにより、これらの各発光ダイオードの輝度を調節することが可能であることを特徴とする照明装置。
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- 2011-08-08 WO PCT/JP2011/068074 patent/WO2012039205A1/ja active Application Filing
- 2011-08-08 KR KR1020137006918A patent/KR101428430B1/ko active IP Right Grant
- 2011-08-08 US US13/821,073 patent/US8773043B2/en not_active Expired - Fee Related
- 2011-08-15 TW TW100129115A patent/TWI455648B/zh not_active IP Right Cessation
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CN103988584A (zh) * | 2012-08-06 | 2014-08-13 | 梅洛实验室株式会社 | 利用发光元件的照明装置的调光系统 |
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CN107018592A (zh) * | 2017-03-20 | 2017-08-04 | 吴广毅 | 一种可调光调色温的led灯 |
CN107018592B (zh) * | 2017-03-20 | 2019-01-11 | 吴广毅 | 一种可调光调色温的led灯 |
Also Published As
Publication number | Publication date |
---|---|
US8773043B2 (en) | 2014-07-08 |
KR101428430B1 (ko) | 2014-08-07 |
CN103098236A (zh) | 2013-05-08 |
TW201215237A (en) | 2012-04-01 |
JP2012069826A (ja) | 2012-04-05 |
JP4975856B2 (ja) | 2012-07-11 |
TWI455648B (zh) | 2014-10-01 |
KR20130071473A (ko) | 2013-06-28 |
CN103098236B (zh) | 2016-02-17 |
US20130162150A1 (en) | 2013-06-27 |
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