WO2014087874A1 - Illumination device - Google Patents

Illumination device Download PDF

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Publication number
WO2014087874A1
WO2014087874A1 PCT/JP2013/081707 JP2013081707W WO2014087874A1 WO 2014087874 A1 WO2014087874 A1 WO 2014087874A1 JP 2013081707 W JP2013081707 W JP 2013081707W WO 2014087874 A1 WO2014087874 A1 WO 2014087874A1
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Prior art keywords
current
light emitting
emitting elements
parallel
emitting element
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PCT/JP2013/081707
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French (fr)
Japanese (ja)
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正利 米山
伸哉 三木
淳弥 若原
司 八木
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コニカミノルタ株式会社
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Priority to JP2014551042A priority Critical patent/JPWO2014087874A1/en
Publication of WO2014087874A1 publication Critical patent/WO2014087874A1/en

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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
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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]
    • H05B45/20—Controlling the colour of the light

Definitions

  • the present invention relates to an illumination device including a plurality of light emitting elements connected in series to a constant current source.
  • Patent Document 1 discloses an invention related to an LED lighting device.
  • the LED lighting device includes a plurality of LED elements connected in series, a plurality of switch elements connected in parallel to each of the LED elements, a constant current source that supplies a constant current to a series-parallel circuit of the LED elements and the switch elements, And a control circuit for controlling the brightness of the LED element by controlling on / off of the switch element.
  • Patent Document 1 The device disclosed in Japanese Patent Laying-Open No. 2009-134933 (Patent Document 1) is an LED lighting device that controls the number of elements that emit light by turning on / off switching elements among a plurality of LED elements connected in series. The brightness is adjusted. Thus, in patent document 1, it aims at adjusting the brightness
  • Patent Document 1 discloses a problem of dimming white by controlling the currents flowing through a plurality of light emitting elements having different emission spectra, for example, a red light emitting element, a green light emitting element, and a blue light emitting element, in a multivalued manner. The solution is not disclosed.
  • An object of the present invention is to provide an illuminating device that can control a current supplied to a light emitting element in a multivalued manner.
  • a lighting device is connected in parallel to a plurality of light emitting elements having different emission spectra connected in series, a constant current source for supplying a constant current to the plurality of light emitting elements, and a plurality of the light emitting elements.
  • a plurality of current bypass circuits, and each of the plurality of current bypass circuits controls a current flowing in its own circuit to increase or decrease a current supplied to the light emitting elements connected in parallel.
  • an illuminating device that can control multi-valued currents supplied to a plurality of light emitting elements having different emission spectra.
  • FIG. 1 is a circuit diagram illustrating a configuration of an illumination device 100 according to an embodiment.
  • the lighting device 100 includes a plurality of light emitting elements (red light emitting element 1, green light emitting element 2, and blue light emitting element 3) that respectively emit red, green, and blue light, current bypass circuits 10, 20, 30, and a constant current source. 40.
  • the constant current source 40 is for supplying a constant current to the light emitting elements 1, 2, 3 connected in series, and includes a current detection resistor 41, a transistor 42, a current sense amplifier 43, and a current setting amplifier 44.
  • One end of the current detection resistor 41 is connected to a power supply device (not shown).
  • the other end of the current detection resistor 41 is connected to the transistor 42.
  • the current sense amplifier 43 has two input terminals connected to both ends of the current detection resistor 41 and an output terminal connected to one input terminal of the current setting amplifier 44.
  • the current sense amplifier 43 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 41 and outputs it as a current detection signal.
  • the current detection signal is input to the current setting amplifier 44 and compared with the reference level signal 45.
  • the current setting amplifier 44 outputs a control signal to the gate of a transistor 42 (FET: Field Effect Transistor) based on the current detection signal and the reference level signal 45, and controls the magnitude of the current flowing through the transistor 42.
  • the constant current source 40 outputs (discharges) the drive current ID as a constant current.
  • the constant current source 40 is disposed on the anode side of the plurality of light emitting elements in the present embodiment, but may be disposed on the cathode side.
  • a red light emitting element 1 a green light emitting element 2, and a blue light emitting element 3 are used as a plurality of light emitting elements having different emission spectra.
  • the red light emitting element 1, the green light emitting element 2, and the blue light emitting element 3 are connected in series.
  • organic EL also referred to as OLED: Organic Light Emitting Diode or Organic Electroluminescence
  • a light emitting diode LED
  • the lighting device 100 may further include other light emitting elements in addition to these.
  • this embodiment mode is not particularly limited to these, and a configuration in which a plurality of (two or more) light-emitting elements are connected in series.
  • any configuration may be employed, and a configuration in which another light emitting element of a different type or another light emitting element of the same type is further provided may be employed.
  • FIG. 2 is a schematic diagram illustrating an example of the configuration of the lighting device 100.
  • a red light emitting element 1 red light emitting layer
  • a green light emitting element 2 green light emitting layer
  • a blue light emitting element 3 blue light emitting layer
  • Each of the red light emitting element 1, the green light emitting element 2, and the blue light emitting element 3 is an organic EL element, and these organic layers are sandwiched between electrodes 4.
  • Each organic layer emits light when power is supplied to each electrode from an external power source.
  • the control circuit 5 controls the current supplied to each electrode by the control circuit 5
  • the luminance balance of each light-emitting element can be dimmed, and the dimming and toning of the light emitted from the lighting device 100 can be controlled. it can.
  • the current bypass circuit 10 is connected in parallel to the red light emitting element 1. Specifically, the current bypass circuit 10 includes a current detection resistor 11, a transistor 12, a current sense amplifier 13, and a current setting amplifier 14. The current detection resistor 11 and the transistor 12 are connected in series. The current sense amplifier 13 has two input terminals connected to both ends of the current detection resistor 11 and an output terminal connected to one input terminal of the current setting amplifier 14. Yes.
  • the current sense amplifier 13 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 11 and outputs it as a current detection signal.
  • the current detection signal is input to the current setting amplifier 14 and compared with the current setting signal 15.
  • the current setting signal 15 is a command value input by the user of the lighting device 100, for example.
  • the current setting amplifier 14 outputs a control signal to the transistor 12 based on the current detection signal and the desired current setting signal 15, and controls the current value of the current IB1 (bypass current) flowing through the transistor 12.
  • the current bypass circuit 20 is connected in parallel to the green light emitting element 2.
  • the current bypass circuit 20 includes a current detection resistor 21, a transistor 22, a current sense amplifier 23, and a current setting amplifier 24.
  • the current detection resistor 21 and the transistor 22 are connected in series.
  • the current sense amplifier 23 has two input terminals connected to both ends of the current detection resistor 21, and an output terminal connected to one input terminal of the current setting amplifier 24. Yes.
  • the current sense amplifier 23 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 21 and outputs it as a current detection signal.
  • the current detection signal is input to the current setting amplifier 24 and compared with the current setting signal 25.
  • the current setting signal 25 is a command value input by the user of the lighting device 100, for example.
  • the current setting amplifier 24 outputs a control signal to the transistor 22 based on the current detection signal and the desired current setting signal 25, and controls the current value of the current IB2 (bypass current) flowing through the transistor 22.
  • the current bypass circuit 30 is connected in parallel to the blue light emitting element 3.
  • the current bypass circuit 30 includes a current detection resistor 31, a transistor 32, a current sense amplifier 33, and a current setting amplifier 34.
  • the current detection resistor 31 and the transistor 32 are connected in series.
  • the current sense amplifier 33 has two input terminals connected to both ends of the current detection resistor 31 and an output terminal connected to one input terminal of the current setting amplifier 34. Yes.
  • the current sense amplifier 33 amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 31 as appropriate, and outputs it as a current detection signal.
  • the current detection signal is input to the current setting amplifier 34 and compared with the current setting signal 35.
  • the current setting signal 35 is a command value input by the user of the lighting device 100, for example.
  • the current setting amplifier 34 outputs a control signal to the transistor 32 based on the current detection signal and the desired current setting signal 35, and controls the current value of the current IB3 (bypass current) flowing through the transistor 32.
  • the dimming and toning of light emitted from the illumination device 100 can be freely controlled by adjusting the luminance balance of the three color light emitting elements 1, 2, and 3. It becomes possible to do.
  • Patent Document 1 the current supplied to each light emitting element can be controlled in a multivalued manner. Fine dimming and toning can be achieved.
  • the allowable current values (rated currents) of the plurality of light emitting elements used in the lighting device 100 may be different from each other.
  • the current supplied to the plurality of LED elements connected in series to the constant current source is turned on / off by the switch elements connected in parallel to the respective LED elements. It is controlled only by.
  • Patent Document 1 when the brightness of each LED element is to be changed, the current value of the constant current needs to be matched with the current allowable value of the LED element having the smallest current allowable value. is there. Other LED elements are driven at a current value equal to or lower than the rated current, and cannot output the rated luminance. If the current value of the constant current is matched with the current allowable value of the LED element having the largest current allowable value, the LED element having the small current allowable value needs to take a long off time in order to prevent deterioration or the like. Therefore, the brightness change range cannot be widened. It is difficult to achieve fine light control and color adjustment.
  • the current supplied to each light emitting element can be controlled in multiple values. Therefore, even if the current allowable values of the plurality of light emitting elements used in the lighting device 100 are different, the current value of the drive current ID is the current allowable value of the light emitting element having the largest current allowable value (or it). Above). In this case, the bypass current flowing through the bypass circuit of the light emitting element is reduced so as not to exceed the current allowable value of the light emitting element having a small allowable current value. By appropriately adjusting the current value of the bias current, all the light emitting elements can output at the rated luminance.
  • the lighting device 100 is not limited to multi-level dimming as described above, and binary dimming (so-called PWM (Pulse Width Modulation) control) may be performed using a current bypass circuit.
  • PWM Pulse Width Modulation
  • Multi-level dimming and binary dimming may both be performed in a superimposed manner using a current bypass circuit, or only one of them may be performed using a current bypass circuit.
  • current setting signal 15 having levels 1 and 2 as indicated by line S in FIG. 3 is input to current bypass circuit 10 connected in parallel to red light emitting element 1.
  • current setting signal 15 is level 1 (first setting value)
  • PWM control current flowing through the red light emitting element 1
  • the PWM control is turned on.
  • the PWM control repeats the on state and the off state, and emits red light.
  • the current value of the current IL flowing through the element 1 is also switched periodically.
  • Digital dimming by PWM control is possible. By performing similar control in each light emitting element, the lighting device 100 as a whole can perform binary dimming by PWM control.
  • the set values of level 1 and level 2 are adjusted as appropriate. By combination, finer light adjustment and color adjustment can be performed. Further, current control using a sawtooth current may be performed by continuously changing the set values of level 1 and level 2. In addition to level 1 and level 2, current control may be performed at a plurality of levels.

Abstract

An illumination device (100) comprises: a plurality of serially connected light emitting elements (1, 2, 3) having respectively differing light emission spectra; a constant-voltage power source (40) which supplies a constant voltage to the plurality of light emitting elements; and a plurality of current bypass circuits (10, 20, 30) which are respectively connected in parallel to the plurality of light emitting elements. Each of the plurality of current bypass circuits controls the current (IB1, IB2, IB3) passing through the circuit thereof, thereby increasing or decreasing the current (IL1, IL2, IL3) which is supplied to the light emitting elements which are connected in parallel thereto. The lighting device (100) allows multiple-valued control of the current which is supplied to the light emitting elements.

Description

照明装置Lighting device
　本発明は、定電流源に直列接続された複数の発光素子を備える照明装置に関する。 The present invention relates to an illumination device including a plurality of light emitting elements connected in series to a constant current source.
　特開２００９－１３４９３３号公報（特許文献１）は、ＬＥＤ点灯装置に関する発明を開示している。このＬＥＤ点灯装置は、直列接続された複数のＬＥＤ素子と、ＬＥＤ素子の各々に並列接続された複数のスイッチ素子と、ＬＥＤ素子とスイッチ素子の直並列回路に定電流を供給する定電流源と、スイッチ素子のオンオフを制御することによりＬＥＤ素子の輝度を制御する制御回路と、を備える。 Japanese Patent Laying-Open No. 2009-134933 (Patent Document 1) discloses an invention related to an LED lighting device. The LED lighting device includes a plurality of LED elements connected in series, a plurality of switch elements connected in parallel to each of the LED elements, a constant current source that supplies a constant current to a series-parallel circuit of the LED elements and the switch elements, And a control circuit for controlling the brightness of the LED element by controlling on / off of the switch element.
特開２００９－１３４９３３号公報JP 2009-134933 A
　特開２００９－１３４９３３号公報（特許文献１）に開示される装置は、直列接続された複数のＬＥＤ素子のうち、スイッチ素子のオンオフによって発光させる素子の数を制御することにより、ＬＥＤ点灯装置の輝度を調整している。このように、特許文献１では、ＬＥＤ点灯装置の輝度を調整することを目的としている。しかしながら特許文献１は、発光スペクトルが各々異なる複数の発光素子、たとえば赤色発光素子、緑色発光素子および青色発光素子に流れる電流を多値的に制御することにより、白色に調光するといった解決課題や、その解決手段については開示されていない。 The device disclosed in Japanese Patent Laying-Open No. 2009-134933 (Patent Document 1) is an LED lighting device that controls the number of elements that emit light by turning on / off switching elements among a plurality of LED elements connected in series. The brightness is adjusted. Thus, in patent document 1, it aims at adjusting the brightness | luminance of a LED lighting device. However, Patent Document 1 discloses a problem of dimming white by controlling the currents flowing through a plurality of light emitting elements having different emission spectra, for example, a red light emitting element, a green light emitting element, and a blue light emitting element, in a multivalued manner. The solution is not disclosed.
　本発明は、発光素子に供給される電流を多値的に制御可能とする照明装置を提供することを目的とする。 An object of the present invention is to provide an illuminating device that can control a current supplied to a light emitting element in a multivalued manner.
　本発明に基づく照明装置は、直列接続された発光スペクトルが各々異なる複数の発光素子と、複数の上記発光素子に定電流を供給する定電流源と、複数の上記発光素子の各々に並列接続された複数の電流バイパス回路と、を備え、複数の上記電流バイパス回路の各々は、自身の回路に流れる電流を制御することにより、並列接続された上記発光素子に供給される電流を増減させる。 A lighting device according to the present invention is connected in parallel to a plurality of light emitting elements having different emission spectra connected in series, a constant current source for supplying a constant current to the plurality of light emitting elements, and a plurality of the light emitting elements. A plurality of current bypass circuits, and each of the plurality of current bypass circuits controls a current flowing in its own circuit to increase or decrease a current supplied to the light emitting elements connected in parallel.
　本発明によれば、発光スペクトルが各々異なる複数の発光素子に供給される電流を多値的に制御可能とする照明装置を提供できる。 According to the present invention, it is possible to provide an illuminating device that can control multi-valued currents supplied to a plurality of light emitting elements having different emission spectra.
実施の形態における照明装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the illuminating device in embodiment. 実施の形態における照明装置の構成の一例を示す概略図である。It is the schematic which shows an example of a structure of the illuminating device in embodiment. 実施の形態における照明装置に用いられる各部の動作を示す図である。It is a figure which shows operation | movement of each part used for the illuminating device in embodiment.
　本発明に基づいた実施の形態について、以下、図面を参照しながら説明する。実施の形態の説明において、個数および量などに言及する場合、特に記載がある場合を除き、本発明の範囲は必ずしもその個数およびその量などに限定されない。実施の形態の説明において、同一の部品および相当部品に対しては、同一の参照番号を付し、重複する説明は繰り返さない場合がある。特に制限が無い限り、実施の形態に示す構成に示す構成を適宜組み合わせて用いることは、当初から予定されていることである。 Embodiments according to the present invention will be described below with reference to the drawings. In the description of the embodiments, when the number and amount are referred to, the scope of the present invention is not necessarily limited to the number and amount unless otherwise specified. In the description of the embodiments, the same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. Unless there is a restriction | limiting in particular, it is planned from the beginning to use suitably combining the structure shown in the structure shown to embodiment.
　図１は、実施の形態における照明装置１００の構成を示す回路図である。照明装置１００は、赤色、緑色および青色の光をそれぞれ発光する複数の発光素子（赤色発光素子１、緑色発光素子２および青色発光素子３）、電流バイパス回路１０，２０，３０、ならびに定電流源４０を備える。 FIG. 1 is a circuit diagram illustrating a configuration of an illumination device 100 according to an embodiment. The lighting device 100 includes a plurality of light emitting elements (red light emitting element 1, green light emitting element 2, and blue light emitting element 3) that respectively emit red, green, and blue light, current bypass circuits 10, 20, 30, and a constant current source. 40.
　（定電流源）
　定電流源４０は、直列接続された各発光素子１，２，３に定電流を供給するためのものであり、電流検出抵抗４１、トランジスター４２、電流センスアンプ４３および電流設定アンプ４４を含む。電流検出抵抗４１の一端は、図示しない電源装置に接続されている。電流検出抵抗４１の他端は、トランジスター４２に接続されている。電流センスアンプ４３は、２つの入力端子が電流検出抵抗４１の両端にそれぞれ接続され、出力端子が電流設定アンプ４４の一方の入力端子に接続されている。 (Constant current source)
The constant current source 40 is for supplying a constant current to the light emitting elements 1, 2, 3 connected in series, and includes a current detection resistor 41, a transistor 42, a current sense amplifier 43, and a current setting amplifier 44. One end of the current detection resistor 41 is connected to a power supply device (not shown). The other end of the current detection resistor 41 is connected to the transistor 42. The current sense amplifier 43 has two input terminals connected to both ends of the current detection resistor 41 and an output terminal connected to one input terminal of the current setting amplifier 44.
　電流センスアンプ４３は、電流検出抵抗４１の両端の電位差に応じた信号を、適宜増幅して電流検出信号として出力する。電流検出信号は、電流設定アンプ４４に入力され、基準レベル信号４５と比較される。電流設定アンプ４４は、電流検出信号と基準レベル信号４５とに基づいて、制御信号をトランジスター４２（ＦＥＴ：Field　Effect　Transistor）のゲートに出力し、トランジスター４２を流れる電流の大きさを制御する。定電流源４０からは、駆動電流ＩＤが定電流として出力される（吐き出される）。定電流源４０は、本実施の形態では複数の発光素子の陽極側に配置されるが、陰極側に配置されてもよい。 The current sense amplifier 43 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 41 and outputs it as a current detection signal. The current detection signal is input to the current setting amplifier 44 and compared with the reference level signal 45. The current setting amplifier 44 outputs a control signal to the gate of a transistor 42 (FET: Field Effect Transistor) based on the current detection signal and the reference level signal 45, and controls the magnitude of the current flowing through the transistor 42. The constant current source 40 outputs (discharges) the drive current ID as a constant current. The constant current source 40 is disposed on the anode side of the plurality of light emitting elements in the present embodiment, but may be disposed on the cathode side.
　（発光素子）
　本実施の形態では、発光スペクトルが各々異なる複数の発光素子として、赤色発光素子１、緑色発光素子２および青色発光素子３が用いられる。赤色発光素子１、緑色発光素子２および青色発光素子３は、直列接続されている。これらを構成する発光素子としては、有機ＥＬ（ＯＬＥＤ：Organic　Light　Emitting　Diode、若しくはOrganic　Electroluminescenceともいう）等が挙げられる。あるいは、発光ダイオード（ＬＥＤ：Light　Emitting　Diode）が用いられてもよい。照明装置１００は、これらに加えて他の発光素子をさらに備えていてもよい。なお、本実施の形態においては３種類の発光素子について説明するが、本実施の形態は特にこれらに限定されるものではなく、複数（２以上）の発光素子が直列に接続される構成であれば、どのような構成を採用してもよく、異なる種類の他の発光素子や、同一の種類の他の発光素子をさらに設けるという構成を採用してもよい。 (Light emitting element)
In the present embodiment, a red light emitting element 1, a green light emitting element 2, and a blue light emitting element 3 are used as a plurality of light emitting elements having different emission spectra. The red light emitting element 1, the green light emitting element 2, and the blue light emitting element 3 are connected in series. As a light-emitting element constituting these, organic EL (also referred to as OLED: Organic Light Emitting Diode or Organic Electroluminescence) or the like can be given. Alternatively, a light emitting diode (LED) may be used. The lighting device 100 may further include other light emitting elements in addition to these. Note that although three types of light-emitting elements are described in this embodiment mode, this embodiment mode is not particularly limited to these, and a configuration in which a plurality of (two or more) light-emitting elements are connected in series. For example, any configuration may be employed, and a configuration in which another light emitting element of a different type or another light emitting element of the same type is further provided may be employed.
　図２は、照明装置１００の構成の一例を示す概略図である。図２紙面内の上から下に向かって、赤色発光素子１（赤色発光層）、緑色発光素子２（緑色発光層）および青色発光素子３（青色発光層）が積層されている。赤色発光素子１、緑色発光素子２および青色発光素子３は、いずれも有機ＥＬ素子であり、これらの各有機層は電極４で挟持されている。各電極に外部電源から給電することにより、各有機層が発光する。このとき、各電極に供給される電流を制御回路５によって制御することにより、各発光素子の輝度バランスを調光し、照明装置１００から発光される光の調光および調色を制御することができる。 FIG. 2 is a schematic diagram illustrating an example of the configuration of the lighting device 100. In FIG. 2, a red light emitting element 1 (red light emitting layer), a green light emitting element 2 (green light emitting layer), and a blue light emitting element 3 (blue light emitting layer) are laminated from the top to the bottom in the drawing. Each of the red light emitting element 1, the green light emitting element 2, and the blue light emitting element 3 is an organic EL element, and these organic layers are sandwiched between electrodes 4. Each organic layer emits light when power is supplied to each electrode from an external power source. At this time, by controlling the current supplied to each electrode by the control circuit 5, the luminance balance of each light-emitting element can be dimmed, and the dimming and toning of the light emitted from the lighting device 100 can be controlled. it can.
　（電流バイパス回路）
　電流バイパス回路１０は、赤色発光素子１に並列接続される。具体的には、電流バイパス回路１０は、電流検出抵抗１１、トランジスター１２、電流センスアンプ１３および電流設定アンプ１４を含む。電流検出抵抗１１およびトランジスター１２は直列接続され、電流センスアンプ１３は、２つの入力端子が電流検出抵抗１１の両端にそれぞれ接続され、出力端子が電流設定アンプ１４の一方の入力端子に接続されている。 (Current bypass circuit)
The current bypass circuit 10 is connected in parallel to the red light emitting element 1. Specifically, the current bypass circuit 10 includes a current detection resistor 11, a transistor 12, a current sense amplifier 13, and a current setting amplifier 14. The current detection resistor 11 and the transistor 12 are connected in series. The current sense amplifier 13 has two input terminals connected to both ends of the current detection resistor 11 and an output terminal connected to one input terminal of the current setting amplifier 14. Yes.
　電流センスアンプ１３は、電流検出抵抗１１の両端の電位差に応じた信号を、適宜増幅して電流検出信号として出力する。電流検出信号は、電流設定アンプ１４に入力され、電流設定信号１５と比較される。電流設定信号１５は、たとえば、照明装置１００のユーザーによって入力される指令値である。電流設定アンプ１４は、電流検出信号と所望の電流設定信号１５とに基づいて、制御信号をトランジスター１２に出力し、トランジスター１２を流れる電流ＩＢ１（バイパス電流）の電流値を制御する。 The current sense amplifier 13 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 11 and outputs it as a current detection signal. The current detection signal is input to the current setting amplifier 14 and compared with the current setting signal 15. The current setting signal 15 is a command value input by the user of the lighting device 100, for example. The current setting amplifier 14 outputs a control signal to the transistor 12 based on the current detection signal and the desired current setting signal 15, and controls the current value of the current IB1 (bypass current) flowing through the transistor 12.
　赤色発光素子１に電流バイパス回路１０が並列接続されていることにより、赤色発光素子１に流れる電流ＩＬ１（ＩＬ１＝ＩＤ－ＩＢ１）の電流値を、所望の電流設定信号１５に応じて（換言すると、電流バイパス回路１０自身に流れる電流の電流値に応じて）多値的に増減することが可能となる。 Since the current bypass circuit 10 is connected in parallel to the red light emitting element 1, the current value of the current IL1 (IL1 = ID−IB1) flowing through the red light emitting element 1 is changed according to a desired current setting signal 15 (in other words, It is possible to increase or decrease in a multivalued manner (in accordance with the current value of the current flowing through the current bypass circuit 10 itself).
　同様に、電流バイパス回路２０は、緑色発光素子２に並列接続される。具体的には、電流バイパス回路２０は、電流検出抵抗２１、トランジスター２２、電流センスアンプ２３および電流設定アンプ２４を含む。電流検出抵抗２１およびトランジスター２２は直列接続され、電流センスアンプ２３は、２つの入力端子が電流検出抵抗２１の両端にそれぞれ接続され、出力端子が電流設定アンプ２４の一方の入力端子に接続されている。 Similarly, the current bypass circuit 20 is connected in parallel to the green light emitting element 2. Specifically, the current bypass circuit 20 includes a current detection resistor 21, a transistor 22, a current sense amplifier 23, and a current setting amplifier 24. The current detection resistor 21 and the transistor 22 are connected in series. The current sense amplifier 23 has two input terminals connected to both ends of the current detection resistor 21, and an output terminal connected to one input terminal of the current setting amplifier 24. Yes.
　電流センスアンプ２３は、電流検出抵抗２１の両端の電位差に応じた信号を、適宜増幅して電流検出信号として出力する。電流検出信号は、電流設定アンプ２４に入力され、電流設定信号２５と比較される。電流設定信号２５は、たとえば、照明装置１００のユーザーによって入力される指令値である。電流設定アンプ２４は、電流検出信号と所望の電流設定信号２５とに基づいて、制御信号をトランジスター２２に出力し、トランジスター２２を流れる電流ＩＢ２（バイパス電流）の電流値を制御する。 The current sense amplifier 23 appropriately amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 21 and outputs it as a current detection signal. The current detection signal is input to the current setting amplifier 24 and compared with the current setting signal 25. The current setting signal 25 is a command value input by the user of the lighting device 100, for example. The current setting amplifier 24 outputs a control signal to the transistor 22 based on the current detection signal and the desired current setting signal 25, and controls the current value of the current IB2 (bypass current) flowing through the transistor 22.
　緑色発光素子２に電流バイパス回路２０が並列接続されていることにより、緑色発光素子２に流れる電流ＩＬ２（ＩＬ２＝ＩＤ－ＩＢ２）の電流値を、所望の電流設定信号２５に応じて（換言すると、電流バイパス回路２０自身に流れる電流の電流値に応じて）多値的に増減することが可能となる。 Since the current bypass circuit 20 is connected in parallel to the green light emitting element 2, the current value of the current IL2 (IL2 = ID−IB2) flowing through the green light emitting element 2 is changed according to the desired current setting signal 25 (in other words, It is possible to increase or decrease in a multivalued manner (in accordance with the current value of the current flowing through the current bypass circuit 20 itself).
　同様に、電流バイパス回路３０は、青色発光素子３に並列接続される。具体的には、電流バイパス回路３０は、電流検出抵抗３１、トランジスター３２、電流センスアンプ３３および電流設定アンプ３４を含む。電流検出抵抗３１およびトランジスター３２は直列接続され、電流センスアンプ３３は、２つの入力端子が電流検出抵抗３１の両端にそれぞれ接続され、出力端子が電流設定アンプ３４の一方の入力端子に接続されている。 Similarly, the current bypass circuit 30 is connected in parallel to the blue light emitting element 3. Specifically, the current bypass circuit 30 includes a current detection resistor 31, a transistor 32, a current sense amplifier 33, and a current setting amplifier 34. The current detection resistor 31 and the transistor 32 are connected in series. The current sense amplifier 33 has two input terminals connected to both ends of the current detection resistor 31 and an output terminal connected to one input terminal of the current setting amplifier 34. Yes.
　電流センスアンプ３３は、電流検出抵抗３１の両端の電位差に応じた信号を、適宜増幅して電流検出信号として出力する。電流検出信号は、電流設定アンプ３４に入力され、電流設定信号３５と比較される。電流設定信号３５は、たとえば、照明装置１００のユーザーによって入力される指令値である。電流設定アンプ３４は、電流検出信号と所望の電流設定信号３５とに基づいて、制御信号をトランジスター３２に出力し、トランジスター３２を流れる電流ＩＢ３（バイパス電流）の電流値を制御する。 The current sense amplifier 33 amplifies a signal corresponding to the potential difference between both ends of the current detection resistor 31 as appropriate, and outputs it as a current detection signal. The current detection signal is input to the current setting amplifier 34 and compared with the current setting signal 35. The current setting signal 35 is a command value input by the user of the lighting device 100, for example. The current setting amplifier 34 outputs a control signal to the transistor 32 based on the current detection signal and the desired current setting signal 35, and controls the current value of the current IB3 (bypass current) flowing through the transistor 32.
　青色発光素子３に電流バイパス回路３０が並列接続されていることにより、青色発光素子３に流れる電流ＩＬ３（ＩＬ３＝ＩＤ－ＩＢ３）の電流値を、所望の電流設定信号３５に応じて（換言すると、電流バイパス回路３０自身に流れる電流の電流値に応じて）多値的に増減することが可能となる。 Since the current bypass circuit 30 is connected in parallel to the blue light emitting element 3, the current value of the current IL3 (IL3 = ID−IB3) flowing through the blue light emitting element 3 is changed according to a desired current setting signal 35 (in other words, It is possible to increase or decrease in a multivalued manner (in accordance with the current value of the current flowing through the current bypass circuit 30 itself).
　以上のように構成される照明装置１００においては、３色の発光素子１，２，３の輝度バランスを調節することにより、照明装置１００から発光される光の調光および調色を自由に制御することが可能となる。照明装置１００においては、冒頭で説明した特開２００９－１３４９３３号公報（特許文献１）に開示される装置とは異なり、各発光素子に供給される電流を多値的に制御可能であるため、きめ細やかな調光および調色を実現することができる。 In the illumination device 100 configured as described above, the dimming and toning of light emitted from the illumination device 100 can be freely controlled by adjusting the luminance balance of the three color light emitting elements 1, 2, and 3. It becomes possible to do. Unlike the device disclosed in Japanese Patent Application Laid-Open No. 2009-134933 (Patent Document 1) described in the beginning of the lighting device 100, the current supplied to each light emitting element can be controlled in a multivalued manner. Fine dimming and toning can be achieved.
　ここで、照明装置１００に用いられる複数の発光素子の電流許容値（定格電流）は、互いに異なっている場合もある。上述のとおり、上記公報（特許文献１）に開示される装置では、定電流源に直列接続された複数のＬＥＤ素子に供給される電流を、それぞれのＬＥＤ素子に並列接続されたスイッチ素子のオンオフによってのみ制御している。 Here, the allowable current values (rated currents) of the plurality of light emitting elements used in the lighting device 100 may be different from each other. As described above, in the device disclosed in the above publication (Patent Document 1), the current supplied to the plurality of LED elements connected in series to the constant current source is turned on / off by the switch elements connected in parallel to the respective LED elements. It is controlled only by.
　上記公報（特許文献１）に開示される装置では、各ＬＥＤ素子の輝度を変更しようとした場合、定電流の電流値は、最も小さい電流許容値を有するＬＥＤ素子の電流許容値に合わせる必要がある。それ以外のＬＥＤ素子は、定格電流以下の電流値で駆動され、定格輝度を出力することができなくなる。仮に、定電流の電流値を、最も大きい電流許容値を有するＬＥＤ素子の電流許容値に合わせた場合、小さい電流許容値を有するＬＥＤ素子は、劣化等を防止するためにオフ時間を長くとる必要があり、輝度変更幅を広くとることができない。きめ細やかな調光および調色を実現することは難しくなる。 In the apparatus disclosed in the above publication (Patent Document 1), when the brightness of each LED element is to be changed, the current value of the constant current needs to be matched with the current allowable value of the LED element having the smallest current allowable value. is there. Other LED elements are driven at a current value equal to or lower than the rated current, and cannot output the rated luminance. If the current value of the constant current is matched with the current allowable value of the LED element having the largest current allowable value, the LED element having the small current allowable value needs to take a long off time in order to prevent deterioration or the like. Therefore, the brightness change range cannot be widened. It is difficult to achieve fine light control and color adjustment.
　本実施の形態の照明装置１００においては、各発光素子に供給される電流を多値的に制御可能である。したがって、照明装置１００に用いられる複数の発光素子の電流許容値が異なっている場合であっても、駆動電流ＩＤの電流値は、最も大きい電流許容値を有する発光素子の電流許容値（若しくはそれ以上）に合わせることができる。この場合、小さな許容電流値を有する発光素子の電流許容値を超えないように、その発光素子のバイパス回路に流れるバイパス電流を小さくする。バイアス電流の電流値を適切に調節することによって、全ての発光素子が、定格輝度で出力することが可能となる。 In the lighting device 100 of the present embodiment, the current supplied to each light emitting element can be controlled in multiple values. Therefore, even if the current allowable values of the plurality of light emitting elements used in the lighting device 100 are different, the current value of the drive current ID is the current allowable value of the light emitting element having the largest current allowable value (or it). Above). In this case, the bypass current flowing through the bypass circuit of the light emitting element is reduced so as not to exceed the current allowable value of the light emitting element having a small allowable current value. By appropriately adjusting the current value of the bias current, all the light emitting elements can output at the rated luminance.
　照明装置１００においては、上記のような多値的な調光に限られず、電流バイパス回路を用いて二値的な調光（いわゆるＰＷＭ（Pulse　Width　Modulation）制御）が行なわれてもよい。多値的調光および二値的調光は、電流バイパス回路を用いて双方が重畳的に実施されてもよく、電流バイパス回路を用いていずれか一方のみが実施されてもよい。 The lighting device 100 is not limited to multi-level dimming as described above, and binary dimming (so-called PWM (Pulse Width Modulation) control) may be performed using a current bypass circuit. Multi-level dimming and binary dimming may both be performed in a superimposed manner using a current bypass circuit, or only one of them may be performed using a current bypass circuit.
　図３を参照して、たとえば、赤色発光素子１に並列接続された電流バイパス回路１０には、図３中の線Ｓで示すようなレベル１，２を有する電流設定信号１５を入力する。電流設定信号１５がレベル１（第１設定値）のときには、定電流源４０からの駆動電流ＩＤの全てが電流バイパス回路１０に流れる（バイパス電流ＩＢ＝ＩＤ）。ＰＷＭ制御（赤色発光素子１に流れる電流）は、オフ状態となる。電流設定信号１５がレベル２（第２設定値）のときには、定電流源４０からの駆動電流ＩＤの一部が電流バイパス回路１０に流れる（ＩＢ＝ＩＤ－ＩＬ）。ＰＷＭ制御は、オン状態となる。 Referring to FIG. 3, for example, current setting signal 15 having levels 1 and 2 as indicated by line S in FIG. 3 is input to current bypass circuit 10 connected in parallel to red light emitting element 1. When the current setting signal 15 is level 1 (first setting value), all of the drive current ID from the constant current source 40 flows to the current bypass circuit 10 (bypass current IB = ID). PWM control (current flowing through the red light emitting element 1) is turned off. When the current setting signal 15 is level 2 (second setting value), a part of the driving current ID from the constant current source 40 flows to the current bypass circuit 10 (IB = ID−IL). The PWM control is turned on.
　図３中の線Ｓで示すように、レベル１およびレベル２を周期的に繰り返す電流設定信号１５が電流バイパス回路１０に入力されることによって、ＰＷＭ制御はオン状態およびオフ状態を繰り返し、赤色発光素子１に流れる電流ＩＬの電流値も周期的に切り替えられることとなる。ＰＷＭ制御によるデジタル的な調光が可能となる。各発光素子において同様な制御が行なわれることによって、照明装置１００の全体としてＰＷＭ制御による二値的調光が可能となる。 As indicated by the line S in FIG. 3, when the current setting signal 15 that periodically repeats the level 1 and the level 2 is input to the current bypass circuit 10, the PWM control repeats the on state and the off state, and emits red light. The current value of the current IL flowing through the element 1 is also switched periodically. Digital dimming by PWM control is possible. By performing similar control in each light emitting element, the lighting device 100 as a whole can perform binary dimming by PWM control.
　多値的調光および二値的調光を組み合わせて実施する場合には、レベル１およびレベル２の設定値が適宜調節される。組合せにより、さらに細かな調光および調色を行うことが可能となる。また、レベル１およびレベル２の設定値を連続的に変更することにより、のこぎり波電流による電流制御が行なわれてもよい。レベル１およびレベル２に加えて、さらに複数のレベルで電流制御が行なわれてもよい。 When performing multi-level dimming and binary dimming, the set values of level 1 and level 2 are adjusted as appropriate. By combination, finer light adjustment and color adjustment can be performed. Further, current control using a sawtooth current may be performed by continuously changing the set values of level 1 and level 2. In addition to level 1 and level 2, current control may be performed at a plurality of levels.
　以上、本発明に基づいた実施の形態について説明したが、今回開示された実施の形態はすべての点で例示であって制限的なものではない。本発明の技術的範囲は請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 As mentioned above, although embodiment based on this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１　赤色発光素子、２　緑色発光素子、３　青色発光素子、１０，２０，３０　電流バイパス回路、１１，２１，３１，４１　電流検出抵抗、１２，２２，３２，４２　トランジスター（ＦＥＴ）、１３，２３，３３，４３　電流センスアンプ、１４，２４，３４，４４　電流設定アンプ、１５，２５，３５　電流設定信号、４０　定電流源、４５　基準レベル信号、１００　照明装置。 1 red light emitting element, 2 green light emitting element, 3 blue light emitting element, 10, 20, 30 current bypass circuit, 11, 21, 31, 41 current detection resistor, 12, 22, 32, 42 transistor (FET), 13, 23 , 33, 43 Current sense amplifier, 14, 24, 34, 44 Current setting amplifier, 15, 25, 35 Current setting signal, 40 constant current source, 45 reference level signal, 100 lighting device.

Claims (5)

  1. 　直列接続された発光スペクトルが各々異なる複数の発光素子と、
    　複数の前記発光素子に定電流を供給する定電流源と、
    　複数の前記発光素子の各々に並列接続された複数の電流バイパス回路と、を備え、
    　複数の前記電流バイパス回路の各々は、自身の回路に流れる電流を制御することにより、並列接続された前記発光素子に供給される電流を増減させる、
    照明装置。     A plurality of light emitting elements each having a different emission spectrum connected in series;
    A constant current source for supplying a constant current to the plurality of light emitting elements;
    A plurality of current bypass circuits connected in parallel to each of the plurality of light emitting elements,
    Each of the plurality of current bypass circuits controls the current flowing in its own circuit, thereby increasing or decreasing the current supplied to the light emitting elements connected in parallel.
    Lighting device.
  2. 　前記電流バイパス回路は、並列接続された前記発光素子に供給される電流の電流値を制御することにより、並列接続された前記発光素子から発光される光の輝度を調節する、
    請求項１に記載の照明装置。     The current bypass circuit adjusts the luminance of light emitted from the light emitting elements connected in parallel by controlling the current value of the current supplied to the light emitting elements connected in parallel.
    The lighting device according to claim 1.
  3. 　前記電流バイパス回路は、並列接続された前記発光素子に供給される電流の電流値を複数の設定値に周期的に切り替えることで、並列接続された前記発光素子から発光される光の輝度を調節する、
    請求項１または２に記載の照明装置。     The current bypass circuit adjusts the luminance of light emitted from the light emitting elements connected in parallel by periodically switching the current value of the current supplied to the light emitting elements connected in parallel to a plurality of set values. To
    The illumination device according to claim 1 or 2.
  4. 　複数の前記発光素子は、赤色、緑色および青色発光素子を含む、
    請求項１から３のいずれか１項に記載の照明装置。     The plurality of light emitting elements include red, green and blue light emitting elements,
    The lighting device according to any one of claims 1 to 3.
  5. 　複数の前記発光素子の各々は有機ＥＬ素子であり、
    　複数の前記発光素子は積層されており、前記発光素子の各々は電極で挟持されている、
    請求項１から４のいずれか１項に記載の照明装置。     Each of the plurality of light emitting elements is an organic EL element,
    The plurality of light emitting elements are stacked, and each of the light emitting elements is sandwiched between electrodes.
    The illuminating device of any one of Claim 1 to 4.
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