JP2015041429A - Lighting device and luminaire using the same - Google Patents

Lighting device and luminaire using the same Download PDF

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JP2015041429A
JP2015041429A JP2013170666A JP2013170666A JP2015041429A JP 2015041429 A JP2015041429 A JP 2015041429A JP 2013170666 A JP2013170666 A JP 2013170666A JP 2013170666 A JP2013170666 A JP 2013170666A JP 2015041429 A JP2015041429 A JP 2015041429A
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current
light emitting
control
dimming
unit
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JP6176571B2 (en
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明則 平松
Akinori Hiramatsu
明則 平松
滋 井戸
Shigeru Ido
滋 井戸
長谷川　純一
Junichi Hasegawa
純一 長谷川
城戸　大志
Hiroshi Kido
大志 城戸
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Panasonic Intellectual Property Management Co Ltd
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Priority to US14/457,413 priority patent/US9265106B2/en
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Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which can light up a light-emitting element to a deep light control level and can smoothly change the brightness of the light-emitting element over a wide range, and a luminaire using the same.SOLUTION: A DC power supply part 11 has at least one of a first control circuit 111a for controlling an amplitude of output current and a second control circuit 111b for controlling a ratio between the period of outputting the current and the period of not outputting the current. A current adjustment part 12 adjusts the current flowing in an LED 31 by changing the voltage applied to a gate of a transistor Q2. When the light control level by the light control signal S1 is a predetermined value or more, the current adjustment part 12 controls the brightness of the LED 31. When the light control level is less than the predetermined value, a control state controlled by the current adjustment part 12 when the light control level is the predetermined value, is kept and the brightness of the LED 31 is controlled by at least one of the first control circuit 111a and the second control circuit 111b.

Description

本発明は、点灯装置及びそれを用いた照明器具に関するものである。   The present invention relates to a lighting device and a lighting fixture using the lighting device.

従来より、ＬＥＤ（発光ダイオード）モジュールに給電を行う給電アッセンブリが提供されている（例えば特許文献１参照）。この給電アッセンブリは、直流電源の両端間に接続されるダイオードと制御スイッチの直列回路と、制御スイッチに対してデュアルＰＷＭ信号を出力するコントローラとを備え、ダイオードの両端間にはインダクタとＬＥＤモジュールの直列回路が接続されている。   Conventionally, a power supply assembly for supplying power to an LED (light emitting diode) module has been provided (see, for example, Patent Document 1). This power supply assembly includes a series circuit of a diode and a control switch connected between both ends of a DC power supply, and a controller that outputs a dual PWM signal to the control switch. Between the both ends of the diode, an inductor and an LED module are provided. A series circuit is connected.

コントローラはパルス幅変調器を有し、このパルス幅変調器には、電流源からの電流基準信号、検知電流及び高周波のこぎり波信号が入力される。また、パルス幅変調器は、ＡＮＤゲートの一方の入力部に対して高周波ＰＷＭ信号を出力し、ＡＮＤゲートの他方の入力部には低周波ＰＷＭ信号が入力される。そして、ＡＮＤゲートは、高周波ＰＷＭ信号及び低周波ＰＷＭ信号を組み合わせたデュアルＰＷＭ信号を出力し、このデュアルＰＷＭ信号は増幅器を介して制御スイッチのゲートに入力される。   The controller has a pulse width modulator, and a current reference signal, a detection current, and a high-frequency sawtooth signal from a current source are input to the pulse width modulator. The pulse width modulator outputs a high frequency PWM signal to one input part of the AND gate, and a low frequency PWM signal is inputted to the other input part of the AND gate. The AND gate outputs a dual PWM signal obtained by combining the high-frequency PWM signal and the low-frequency PWM signal, and this dual PWM signal is input to the gate of the control switch via the amplifier.

この給電アッセンブリでは、コントローラから制御スイッチへ出力されるデュアルＰＷＭ信号の低周波成分を変化させることによって、ＬＥＤモジュールから出力される光の強度を変化させることができる。   In this power supply assembly, the intensity of light output from the LED module can be changed by changing the low frequency component of the dual PWM signal output from the controller to the control switch.

特表２００６−５１１０７８号公報JP 2006-511078 gazette

ところで、発光ダイオードは白熱灯や蛍光灯に比べて輝度が高いため、白熱灯や蛍光灯と同じ光束で発光させた場合、ユーザは白熱灯や蛍光灯よりも明るいと認識してしまう。したがって、見かけ上の明るさを白熱灯や蛍光灯と同じにするためには、発光ダイオードの駆動電流を抑えて光束を少なくする必要がある。   By the way, since the light emitting diode has higher luminance than incandescent lamps and fluorescent lamps, when the light is emitted with the same luminous flux as incandescent lamps and fluorescent lamps, the user recognizes that the light emitting diodes are brighter than incandescent lamps and fluorescent lamps. Therefore, in order to make the apparent brightness the same as that of an incandescent lamp or a fluorescent lamp, it is necessary to suppress the driving current of the light emitting diode and reduce the luminous flux.

例えば、定格電流が３５０ｍＡの発光ダイオードを１個あるいは複数個備えた照明器具の場合、電流の下限値を数μＡ〜数ｍＡ以下に設定する必要がある。しかしながら、上述の特許文献１に示した給電アッセンブリのように、ＬＥＤモジュールに間欠的に負荷電流が流れるように調光する、所謂バースト調光方式では、上述のような微少電流の制御は困難であった。   For example, in the case of a lighting fixture including one or a plurality of light emitting diodes with a rated current of 350 mA, the lower limit value of the current needs to be set to several μA to several mA or less. However, in the so-called burst dimming method in which dimming is performed so that the load current intermittently flows in the LED module as in the power supply assembly described in Patent Document 1 described above, it is difficult to control the minute current as described above. there were.

また、発光ダイオードをフェードインさせたり、フェードアウトさせる場合、発光ダイオードの明るさを滑らかに変化させるために、微少な電流値から定格電流値までの広範囲に亘って発光ダイオードの駆動電流を制御する必要がある。   In addition, when the light emitting diode is faded in or faded out, it is necessary to control the driving current of the light emitting diode over a wide range from a minute current value to a rated current value in order to smoothly change the brightness of the light emitting diode. There is.

例えば、発光ダイオードの定格電流が３５０ｍＡの場合には、１００μＡ〜３５０ｍＡの範囲で駆動電流を調節する必要があり、１／１０００程度の分解能で駆動電流を制御しなければならない。そのため、上述の特許文献１に示した給電アッセンブリでは、発光ダイオードの明るさを滑らかに変化させることが困難であった。   For example, when the rated current of the light emitting diode is 350 mA, it is necessary to adjust the drive current in the range of 100 μA to 350 mA, and the drive current must be controlled with a resolution of about 1/1000. For this reason, in the power supply assembly shown in Patent Document 1 described above, it is difficult to smoothly change the brightness of the light emitting diode.

本発明は上記問題点に鑑みて為されたものであり、その目的とするところは、より深い調光レベルまで発光素子を点灯可能で且つ発光素子の明るさを広範囲に亘って滑らかに変化可能な点灯装置及びそれを用いた照明器具を提供することにある。   The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to light up the light emitting element to a deeper dimming level and to smoothly change the brightness of the light emitting element over a wide range. And a lighting apparatus using the same lighting device.

本発明の点灯装置は、出力電流の振幅を制御する第１制御回路と電流を出力する期間と電流を出力しない期間の比率を制御する第２制御回路の少なくとも一方を有する直流電源部と、前記直流電源部の出力端間に接続される発光素子及びスイッチ素子の直列回路と、前記スイッチ素子の制御端子に印加する電圧を変化させることで前記発光素子に流れる電流を調整する電流調整部と、を備え、外部からの調光信号による調光レベルが所定値以上である場合には、前記電流調整部により前記発光素子の明るさを制御し、前記調光レベルが前記所定値より小さい場合には、前記調光レベルが前記所定値である場合における前記電流調整部の制御状態を保ちつつ、前記第１制御回路と前記第２制御回路の少なくとも一方により前記発光素子の明るさを制御することを特徴とする。   The lighting device of the present invention includes a DC power supply unit having at least one of a first control circuit that controls the amplitude of an output current, a second control circuit that controls a ratio of a period during which current is output and a period during which current is not output, A series circuit of a light emitting element and a switch element connected between the output terminals of the DC power supply unit, a current adjusting unit for adjusting a current flowing through the light emitting element by changing a voltage applied to a control terminal of the switch element; When the dimming level by the dimming signal from the outside is a predetermined value or more, the brightness of the light emitting element is controlled by the current adjusting unit, and the dimming level is smaller than the predetermined value. The brightness of the light emitting element is controlled by at least one of the first control circuit and the second control circuit while maintaining the control state of the current adjustment unit when the dimming level is the predetermined value. And controlling.

本発明の照明器具は、上記の点灯装置を備えていることを特徴とする。   The lighting fixture of this invention is equipped with said lighting device, It is characterized by the above-mentioned.

調光レベルが所定値以上である場合には電流調整部により調光制御を行ない、調光レベルが所定値より小さくなると電流調整部による調光制御に加えて直流電源部による調光制御を合わせて行なっている。その結果、より深い調光レベルまで発光素子を点灯させることができ、且つ発光素子の明るさを広範囲に亘って滑らかに変化させることができるという効果がある。   When the dimming level is equal to or higher than the predetermined value, dimming control is performed by the current adjustment unit. When the dimming level is lower than the predetermined value, dimming control by the DC power supply unit is combined with dimming control by the current adjusting unit It is done. As a result, the light-emitting element can be turned on to a deeper dimming level, and the brightness of the light-emitting element can be smoothly changed over a wide range.

実施形態１の点灯装置の一例を示す回路図である。2 is a circuit diagram illustrating an example of a lighting device according to Embodiment 1. FIG. 同上におけるゲート電圧と負荷電流の関係を示すグラフである。It is a graph which shows the relationship between the gate voltage and load current in the same as the above. （ａ）〜（ｃ）は同上の動作を説明する説明図である。(A)-(c) is explanatory drawing explaining operation | movement same as the above. （ａ）〜（ｄ）は同上に用いられる直流電源部の一部回路図である。(A)-(d) is a partial circuit diagram of the direct-current power supply part used for the same as the above. 実施形態２の点灯装置におけるゲート電圧と負荷電流の関係を示すグラフである。It is a graph which shows the relationship between the gate voltage and load current in the lighting device of Embodiment 2. （ａ）〜（ｃ）は同上の動作を説明する説明図である。(A)-(c) is explanatory drawing explaining operation | movement same as the above. 実施形態１又は２の点灯装置を用いた照明器具の施工状態を示す断面図である。It is sectional drawing which shows the construction state of the lighting fixture using the lighting device of Embodiment 1 or 2.

以下に、点灯装置及びそれを用いた照明器具の実施形態について図面を参照しながら説明する。   Embodiments of a lighting device and a lighting fixture using the lighting device will be described below with reference to the drawings.

（実施形態１）
図１は本実施形態の点灯装置１の一例を示す回路図であり、この点灯装置１は、直流電源部１１と、電流調整部１２と、調光制御部１３とを備え、調光器２から出力される調光信号Ｓ１に応じた調光レベルで発光部３を点灯させる。 (Embodiment 1)
FIG. 1 is a circuit diagram illustrating an example of a lighting device 1 according to the present embodiment. The lighting device 1 includes a DC power supply unit 11, a current adjustment unit 12, and a dimming control unit 13, and includes a dimmer 2. The light emitting unit 3 is turned on at a dimming level corresponding to the dimming signal S1 output from the.

発光部３は、直列に接続された複数（図１では４個）のＬＥＤ３１（発光素子）からなり、トランジスタＱ２（スイッチ素子）及び抵抗Ｒ１を介して直流電源部１１の出力端間に接続されている。なお、発光部３を構成するＬＥＤ３１の個数は１個でもいいし、２個、３個又は５個以上の複数であってもよい。また、複数のＬＥＤ３１を並列に接続することで発光部３を構成してもよい。   The light emitting unit 3 includes a plurality (four in FIG. 1) of LEDs 31 (light emitting elements) connected in series, and is connected between the output terminals of the DC power supply unit 11 via a transistor Q2 (switching element) and a resistor R1. ing. Note that the number of the LEDs 31 constituting the light emitting unit 3 may be one, or may be two, three, or a plurality of five or more. Moreover, you may comprise the light emission part 3 by connecting several LED31 in parallel.

直流電源部１１は、４つのダイオードにより構成された所謂ダイオードブリッジＤＢ１を有し、ダイオードブリッジＤＢ１の出力端間には平滑コンデンサＣ１が接続されている。また、ダイオードブリッジＤＢ１の出力端間には、トランスＴｒ１の一次巻線ｎ１とトランジスタＱ１の直列回路が接続されている。また、トランスＴｒ１の二次巻線ｎ２の一端にはダイオードＤ１が接続され、さらに二次巻線ｎ２の両端間には平滑コンデンサＣ２が接続されている。   The DC power supply unit 11 has a so-called diode bridge DB1 constituted by four diodes, and a smoothing capacitor C1 is connected between the output terminals of the diode bridge DB1. A series circuit of a primary winding n1 of the transformer Tr1 and a transistor Q1 is connected between the output terminals of the diode bridge DB1. A diode D1 is connected to one end of the secondary winding n2 of the transformer Tr1, and a smoothing capacitor C2 is connected between both ends of the secondary winding n2.

ここに本実施形態では、トランジスタＱ１としてＮチャネル型のＭＯＳＦＥＴを用いており、トランジスタＱ１のゲートには駆動回路１１１が接続されている。この直流電源部１１では、平滑コンデンサＣ２の両端間に生じる直流電圧が直流電源部１１の出力電圧となる。   Here, in this embodiment, an N-channel MOSFET is used as the transistor Q1, and the drive circuit 111 is connected to the gate of the transistor Q1. In the DC power supply unit 11, a DC voltage generated between both ends of the smoothing capacitor C <b> 2 becomes an output voltage of the DC power supply unit 11.

駆動回路１１１は、トランジスタＱ１のオン／オフを制御する回路であり、出力電流の振幅を制御する第１制御回路１１１ａと、電流を出力する期間と電流を出力しない期間の比率を制御する第２制御回路１１１ｂとで構成される。第１制御回路１１１ａは、調光制御部１３から出力される制御信号Ｓ３に応じてトランジスタＱ１のオンデューティ比を設定し、これにより出力電流の振幅を制御する。また、第２制御回路１１１ｂは、ＰＷＭ（Ｐｕｌｓｅ Ｗｉｄｔｈ Ｍｏｄｕｌａｔｉｏｎ）制御を休止する休止期間を設定する。   The drive circuit 111 is a circuit that controls on / off of the transistor Q1, and includes a first control circuit 111a that controls the amplitude of the output current, and a second that controls the ratio of the period in which the current is output and the period in which the current is not output. And a control circuit 111b. The first control circuit 111a sets the on-duty ratio of the transistor Q1 according to the control signal S3 output from the dimming control unit 13, thereby controlling the amplitude of the output current. The second control circuit 111b sets a pause period in which PWM (Pulse Width Modulation) control is paused.

電流調整部１２は、調光制御部１３から出力される制御信号Ｓ２に応じて出力電圧が可変する直流電圧源１２１を有し、直流電圧源１２１の正極はオペアンプ１２２の非反転入力端子に接続されている。また、直流電圧源１２１の負極は、直流電源部１１の負極に接続されている。また、トランジスタＱ２と抵抗Ｒ１の接続点は、オペアンプ１２２の反転入力端子に接続されている。さらに、オペアンプ１２２の出力端子は、トランジスタＱ２のゲート（制御端子）に接続されている。   The current adjustment unit 12 includes a DC voltage source 121 whose output voltage varies according to the control signal S2 output from the dimming control unit 13, and the positive electrode of the DC voltage source 121 is connected to the non-inverting input terminal of the operational amplifier 122. Has been. Further, the negative electrode of the DC voltage source 121 is connected to the negative electrode of the DC power supply unit 11. The connection point between the transistor Q2 and the resistor R1 is connected to the inverting input terminal of the operational amplifier 122. Furthermore, the output terminal of the operational amplifier 122 is connected to the gate (control terminal) of the transistor Q2.

ここに本実施形態では、トランジスタＱ２としてＮチャネル型のＭＯＳＦＥＴを用いており、オペアンプ１２２より出力される電圧の大きさに応じてトランジスタＱ２のインピーダンスが変化する。これにより、発光部３に流れる電流の大きさを調整することができる。   Here, in the present embodiment, an N-channel MOSFET is used as the transistor Q2, and the impedance of the transistor Q2 changes according to the magnitude of the voltage output from the operational amplifier 122. Thereby, the magnitude | size of the electric current which flows into the light emission part 3 can be adjusted.

調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、この調光信号Ｓ１に対応する制御信号Ｓ２，Ｓ３をそれぞれ生成し、制御信号Ｓ２を電流調整部１２に出力するとともに、制御信号Ｓ３を駆動回路１１１に出力する。ここに、調光信号Ｓ１は、発光部３に流すべき負荷電流の大きさ、すなわち発光部３の明るさを示す信号である。   When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 generates control signals S2 and S3 corresponding to the dimming signal S1, and sends the control signal S2 to the current adjustment unit 12. At the same time, the control signal S3 is output to the drive circuit 111. Here, the dimming signal S1 is a signal indicating the magnitude of the load current to be passed through the light emitting unit 3, that is, the brightness of the light emitting unit 3.

次に、点灯装置１の動作について図２及び図３を参照しながら説明する。   Next, the operation of the lighting device 1 will be described with reference to FIGS.

図２は、電流調整部１２を構成するトランジスタＱ２のゲート電圧ｖ１と発光部３に流れる負荷電流ｉ１の関係を示すグラフである。このグラフによれば、負荷電流ｉ１がｉ１２以上の範囲では負荷電流ｉ１が減少するに従ってゲート電圧ｖ１も減少し、負荷電流ｉ１がｉ１２より小さい範囲ではゲート電圧ｖ１は一定値となっている。   FIG. 2 is a graph showing the relationship between the gate voltage v1 of the transistor Q2 constituting the current adjusting unit 12 and the load current i1 flowing through the light emitting unit 3. According to this graph, the gate voltage v1 decreases as the load current i1 decreases in the range where the load current i1 is i12 or more, and the gate voltage v1 is a constant value in the range where the load current i1 is smaller than i12.

また、図３（ａ）及び図３（ｂ）は、第１制御回路１１１ａにより調光制御を行なっているときのトランジスタＱ１へのゲート信号Ｓ４である。負荷電流ｉ１が大きいときは、図３（ａ）に示すようにゲート信号Ｓ４のオンデューティ比（ｔ１／Ｔ１）が大きく、負荷電流ｉ１が小さいときは、図３（ｂ）に示すようにゲート信号Ｓ４のオンデューティ比が小さくなっている。このように、負荷電流ｉ１の大きさに応じてゲート信号Ｓ４のオンデューティ比を変えることで、発光部３の明るさを変えることができる。   3A and 3B show the gate signal S4 to the transistor Q1 when the dimming control is performed by the first control circuit 111a. When the load current i1 is large, the on-duty ratio (t1 / T1) of the gate signal S4 is large as shown in FIG. 3 (a), and when the load current i1 is small, the gate as shown in FIG. 3 (b). The on-duty ratio of the signal S4 is small. As described above, the brightness of the light emitting unit 3 can be changed by changing the on-duty ratio of the gate signal S4 according to the magnitude of the load current i1.

調光器２から出力される調光信号Ｓ１の調光レベルが全点灯を示す場合、直流電源部１１の出力電圧は発光部３の定格電圧に設定され、発光部３に流れる負荷電流ｉ１はｉ１１となる。これにより、発光部３は全点灯する。   When the dimming level of the dimming signal S1 output from the dimmer 2 indicates full lighting, the output voltage of the DC power supply unit 11 is set to the rated voltage of the light emitting unit 3, and the load current i1 flowing through the light emitting unit 3 is i11. As a result, the light emitting unit 3 is fully lit.

この状態から、発光部３が暗くなるように、ユーザが調光器２を操作すると、調光器２から出力される調光信号Ｓ１の調光レベルも小さくなる。調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、トランジスタＱ２のゲート電圧ｖ１を減少させる制御信号Ｓ２を生成し、電流調整部１２に出力する。なお、負荷電流ｉ１がｉ１２以上で且つｉ１１より小さい範囲では、直流電源部１１に対して出力される制御信号Ｓ３は全点灯時と同じ値に設定される。   From this state, when the user operates the dimmer 2 so that the light emitting unit 3 becomes dark, the dimming level of the dimming signal S1 output from the dimmer 2 also decreases. When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 generates a control signal S2 that decreases the gate voltage v1 of the transistor Q2, and outputs the control signal S2 to the current adjustment unit 12. In the range where the load current i1 is equal to or greater than i12 and smaller than i11, the control signal S3 output to the DC power supply unit 11 is set to the same value as when all the lights are on.

電流調整部１２は、調光制御部１３からの制御信号Ｓ２が入力されると、この制御信号Ｓ２に応じたゲート電圧ｖ１となるように直流電圧源１２１の出力電圧を調整する。これにより、発光部３に流れる負荷電流ｉ１が減少し、発光部３の明るさが低下する。なお、上述の動作は、負荷電流ｉ１がｉ１２以上で且つｉ１１より小さい範囲で行われる。   When the control signal S2 from the dimming control unit 13 is input, the current adjustment unit 12 adjusts the output voltage of the DC voltage source 121 so that the gate voltage v1 corresponds to the control signal S2. Thereby, the load current i1 flowing through the light emitting unit 3 is reduced, and the brightness of the light emitting unit 3 is lowered. The above-described operation is performed in a range where the load current i1 is i12 or more and smaller than i11.

次に、発光部３がさらに暗くなるように、ユーザが調光器２を操作すると、調光器２から出力される調光信号Ｓ１の調光レベルもさらに小さくなる。調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、電流調整部１２に制御信号Ｓ２を出力するが、この場合、負荷電流ｉ１がｉ１２となる制御信号Ｓ２を出力する。その結果、図２に示すように、ゲート電圧ｖ１は一定値となる。また、調光制御部１３は、負荷電流ｉ１を減少させる制御信号Ｓ３を生成し、駆動回路１１１に出力する。   Next, when the user operates the dimmer 2 so that the light emitting unit 3 becomes darker, the dimming level of the dimming signal S1 output from the dimmer 2 is further reduced. When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 outputs the control signal S2 to the current adjusting unit 12. In this case, the dimming control unit 13 outputs a control signal S2 that causes the load current i1 to be i12. Output. As a result, as shown in FIG. 2, the gate voltage v1 becomes a constant value. In addition, the dimming control unit 13 generates a control signal S3 that decreases the load current i1 and outputs the control signal S3 to the drive circuit 111.

駆動回路１１１は、調光制御部１３からの制御信号Ｓ３が入力されると、第１制御回路１１１ａが制御信号Ｓ３に従ってトランジスタＱ１のオンデューティ比を小さくし、これにより負荷電流ｉ１が減少するため、発光部３の明るさがさらに低下する。ここに本実施形態では、負荷電流ｉ１＝ｉ１２となるときの調光レベルが所定値である。   When the control signal S3 from the dimming control unit 13 is input to the drive circuit 111, the first control circuit 111a reduces the on-duty ratio of the transistor Q1 in accordance with the control signal S3, thereby reducing the load current i1. The brightness of the light emitting unit 3 is further reduced. Here, in the present embodiment, the dimming level when the load current i1 = i12 is a predetermined value.

上述のように、調光レベルが所定値以上である場合には電流調整部１２により調光制御を行ない、調光レベルが所定値より小さくなると電流調整部１２による調光制御に加えて直流電源部１１による調光制御を合わせて行なっている。その結果、より深い調光レベルまでＬＥＤ３１を点灯させることができ、且つＬＥＤ３１の明るさを広範囲に亘って滑らかに変化させることができる。   As described above, when the dimming level is equal to or higher than the predetermined value, the dimming control is performed by the current adjusting unit 12, and when the dimming level becomes smaller than the predetermined value, the DC power The dimming control by the unit 11 is also performed. As a result, the LED 31 can be lit up to a deeper dimming level, and the brightness of the LED 31 can be smoothly changed over a wide range.

ところで、本実施形態では、ダイオードブリッジＤＢ１の出力電圧を、トランスＴｒ１を用いたフライバックコンバータにより降圧して発光部３に印加したが、フライバックコンバータの代わりに図４（ａ）に示す昇圧チョッパ回路１１２を用いてもよい。   In the present embodiment, the output voltage of the diode bridge DB1 is stepped down by the flyback converter using the transformer Tr1 and applied to the light emitting unit 3. However, the step-up chopper shown in FIG. 4A is used instead of the flyback converter. The circuit 112 may be used.

また、フライバックコンバータの代わりに図４（ｂ）に示す昇降圧チョッパ回路１１３や、図４（ｃ）に示す降圧チョッパ回路１１４、図４（ｄ）に示すフォワードコンバータ回路１１５などを用いてもよい。何れの場合も、発光部３との間に電流調整部１２を設けることで同様の効果が得られる。   Further, instead of the flyback converter, a step-up / step-down chopper circuit 113 shown in FIG. 4B, a step-down chopper circuit 114 shown in FIG. 4C, a forward converter circuit 115 shown in FIG. Good. In any case, the same effect can be obtained by providing the current adjusting unit 12 between the light emitting unit 3.

なお本実施形態では、負荷電流ｉ１がｉ１２以上で且つｉ１１よりも小さい範囲において第１制御回路１１１ａにより調光制御を行ったが、第２制御回路１１１ｂにより調光制御を行ってもよい。図３（ｃ）は、第２制御回路１１１ｂにより調光制御を行なっているときのトランジスタＱ１へのゲート信号Ｓ４である。このときのバースト周波数は数十Ｈｚ〜数十ｋＨｚに設定されており、ＰＷＭ制御を休止する休止区間Ｔ２（電流を出力しない区間）を変化させることで発光部３の調光レベルを調整することができる。   In the present embodiment, the dimming control is performed by the first control circuit 111a in a range where the load current i1 is not less than i12 and smaller than i11. However, the dimming control may be performed by the second control circuit 111b. FIG. 3C shows a gate signal S4 to the transistor Q1 when dimming control is performed by the second control circuit 111b. The burst frequency at this time is set to several tens of Hz to several tens of kHz, and the dimming level of the light emitting unit 3 is adjusted by changing a pause section T2 (section in which no current is output) in which PWM control is paused. Can do.

また本実施形態では、発光素子がＬＥＤの場合を例に説明したが、発光素子はＬＥＤに限定されるものではなく、例えば有機ＥＬ素子やレーザーダイオード（ＬＤ）などであってもよい。さらに本実施形態では、直流電源部１１が第１制御回路１１１ａと第２制御回路１１１ｂの両方を有している場合を例に説明したが、第１制御回路１１１ａと第２制御回路１１１ｂの少なくとも一方を有していればよく、本実施形態に限定されない。   In this embodiment, the case where the light emitting element is an LED has been described as an example. However, the light emitting element is not limited to the LED, and may be, for example, an organic EL element or a laser diode (LD). Further, in the present embodiment, the case where the DC power supply unit 11 includes both the first control circuit 111a and the second control circuit 111b has been described as an example. However, at least the first control circuit 111a and the second control circuit 111b are described. It is sufficient to have one, and it is not limited to this embodiment.

点灯装置１は、直流電源部１１と、直流電源部１１の出力端間に接続されるＬＥＤ３１及びトランジスタＱ２の直列回路と、電流調整部１２と、を備える。直流電源部１１は、出力電流の振幅を制御する第１制御回路１１１ａと電流を出力する期間と電流を出力しない期間の比率を制御する第２制御回路１１１ｂの少なくとも一方を有する。電流調整部１２は、トランジスタＱ２のゲートに印加する電圧を変化させることでＬＥＤ３１に流れる電流を調整する。外部からの調光信号Ｓ１による調光レベルが所定値以上である場合には、電流調整部１２によりＬＥＤ３１の明るさを制御する。また、調光レベルが所定値より小さい場合には、調光レベルが所定値である場合における電流調整部１２の制御状態を保ちつつ、第１制御回路１１１ａと第２制御回路１１１ｂの少なくとも一方によりＬＥＤ３１の明るさを制御する。   The lighting device 1 includes a DC power supply unit 11, a series circuit of an LED 31 and a transistor Q <b> 2 connected between output terminals of the DC power supply unit 11, and a current adjustment unit 12. The DC power supply unit 11 includes at least one of a first control circuit 111a that controls the amplitude of the output current and a second control circuit 111b that controls the ratio of the period during which the current is output and the period during which the current is not output. The current adjustment unit 12 adjusts the current flowing through the LED 31 by changing the voltage applied to the gate of the transistor Q2. When the dimming level by the dimming signal S1 from the outside is a predetermined value or more, the brightness of the LED 31 is controlled by the current adjusting unit 12. Further, when the dimming level is smaller than the predetermined value, at least one of the first control circuit 111a and the second control circuit 111b while maintaining the control state of the current adjusting unit 12 when the dimming level is the predetermined value. The brightness of the LED 31 is controlled.

（実施形態２）
点灯装置１の実施形態２について図５及び図６を参照しながら説明する。なお、点灯装置１の回路構成については実施形態１と同様であるから、ここでは説明を省略し、必要がある場合には図１を参照する。 (Embodiment 2)
Embodiment 2 of the lighting device 1 will be described with reference to FIGS. 5 and 6. Since the circuit configuration of the lighting device 1 is the same as that of the first embodiment, the description is omitted here, and FIG. 1 is referred to when necessary.

本実施形態の点灯装置１は、図１に示すように、直流電源部１１と、電流調整部１２と、調光制御部１３とを備え、調光器２から出力される調光信号Ｓ１に応じた調光レベルで発光部３を点灯させる。   As shown in FIG. 1, the lighting device 1 of the present embodiment includes a DC power supply unit 11, a current adjustment unit 12, and a dimming control unit 13, and generates a dimming signal S <b> 1 output from the dimmer 2. The light emitting unit 3 is turned on at a corresponding dimming level.

図５は、電流調整部１２を構成するトランジスタＱ２のゲート電圧ｖ１と発光部３に流れる負荷電流ｉ１の関係を示すグラフである。このグラフによれば、負荷電流ｉ１がｉ１２以上の範囲では負荷電流ｉ１が減少するに従ってゲート電圧ｖ１も減少し、負荷電流ｉ１がｉ１２より小さい範囲ではゲート電圧ｖ１は一定値となっている。   FIG. 5 is a graph showing the relationship between the gate voltage v1 of the transistor Q2 constituting the current adjusting unit 12 and the load current i1 flowing through the light emitting unit 3. According to this graph, the gate voltage v1 decreases as the load current i1 decreases in the range where the load current i1 is i12 or more, and the gate voltage v1 is a constant value in the range where the load current i1 is smaller than i12.

また、図６（ａ）及び図６（ｂ）は、第１制御回路１１１ａにより調光制御を行なっているときのトランジスタＱ１へのゲート信号Ｓ４である。負荷電流ｉ１が大きいときは、図６（ａ）に示すようにゲート信号Ｓ４のオンデューティ比（ｔ１／Ｔ１）が大きく、負荷電流ｉ１が小さいときは、図６（ｂ）に示すようにゲート信号Ｓ４のオンデューティ比が小さくなっている。このように、負荷電流ｉ１の大きさに応じてゲート信号Ｓ４のオンデューティ比を変えることで、発光部３の明るさを変えることができる。   FIGS. 6A and 6B show the gate signal S4 to the transistor Q1 when the dimming control is performed by the first control circuit 111a. When the load current i1 is large, the on-duty ratio (t1 / T1) of the gate signal S4 is large as shown in FIG. 6A, and when the load current i1 is small, the gate as shown in FIG. 6B. The on-duty ratio of the signal S4 is small. As described above, the brightness of the light emitting unit 3 can be changed by changing the on-duty ratio of the gate signal S4 according to the magnitude of the load current i1.

また、図６（ｃ）は、第２制御回路１１１ｂにより調光制御を行なっているときのトランジスタＱ１へのゲート信号Ｓ４であり、負荷電流ｉ１がｉ１３より小さくなると第２制御回路１１１ｂによる調光制御が行われる。つまり本実施形態では、負荷電流ｉ１がｉ１３以上で且つｉ１２より小さい範囲では第１制御回路１１１ａにより調光制御が行なわれ、負荷電流ｉ１がｉ１３より小さい範囲では第２制御回路１１１ｂにより調光制御が行なわれる。   FIG. 6C shows the gate signal S4 to the transistor Q1 when the dimming control is performed by the second control circuit 111b. When the load current i1 becomes smaller than i13, the dimming by the second control circuit 111b is performed. Control is performed. That is, in the present embodiment, dimming control is performed by the first control circuit 111a when the load current i1 is greater than or equal to i13 and smaller than i12, and dimming control is performed by the second control circuit 111b when the load current i1 is smaller than i13. Is done.

調光器２から出力される調光信号Ｓ１の調光レベルが全点灯を示す場合、直流電源部１１の出力電圧は発光部３の定格電圧に設定され、発光部３に流れる負荷電流ｉ１はｉ１１となる。これにより、発光部３は全点灯する。   When the dimming level of the dimming signal S1 output from the dimmer 2 indicates full lighting, the output voltage of the DC power supply unit 11 is set to the rated voltage of the light emitting unit 3, and the load current i1 flowing through the light emitting unit 3 is i11. As a result, the light emitting unit 3 is fully lit.

この状態から、発光部３が暗くなるように、ユーザが調光器２を操作すると、調光器２から出力される調光信号Ｓ１の調光レベルも小さくなる。調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、トランジスタＱ２のゲート電圧ｖ１を減少させる制御信号Ｓ２を生成し、電流調整部１２に出力する。なお、負荷電流ｉ１がｉ１２以上で且つｉ１１より小さい範囲では、直流電源部１１に対して出力される制御信号Ｓ３は全点灯時と同じ値に設定される。   From this state, when the user operates the dimmer 2 so that the light emitting unit 3 becomes dark, the dimming level of the dimming signal S1 output from the dimmer 2 also decreases. When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 generates a control signal S2 that decreases the gate voltage v1 of the transistor Q2, and outputs the control signal S2 to the current adjustment unit 12. In the range where the load current i1 is equal to or greater than i12 and smaller than i11, the control signal S3 output to the DC power supply unit 11 is set to the same value as when all the lights are on.

電流調整部１２は、調光制御部１３からの制御信号Ｓ２が入力されると、この制御信号Ｓ２に応じたゲート電圧ｖ１となるように直流電圧源１２１の出力電圧を調整する。これにより、発光部３に流れる負荷電流ｉ１が減少し、発光部３の明るさが低下する。なお、上述の動作は、負荷電流ｉ１がｉ１２以上で且つｉ１１より小さい範囲で行われる。   When the control signal S2 from the dimming control unit 13 is input, the current adjustment unit 12 adjusts the output voltage of the DC voltage source 121 so that the gate voltage v1 corresponds to the control signal S2. Thereby, the load current i1 flowing through the light emitting unit 3 is reduced, and the brightness of the light emitting unit 3 is lowered. The above-described operation is performed in a range where the load current i1 is i12 or more and smaller than i11.

次に、発光部３がさらに暗くなるように、ユーザが調光器２を操作すると、調光器２から出力される調光信号Ｓ１の調光レベルもさらに小さくなる。調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、電流調整部１２に制御信号Ｓ２を出力するが、この場合、負荷電流ｉ１がｉ１２となる制御信号Ｓ２を出力する。その結果、図５に示すように、ゲート電圧ｖ１は一定値となる。また、調光制御部１３は、負荷電流ｉ１を減少させる制御信号Ｓ３を生成し、駆動回路１１１に出力する。   Next, when the user operates the dimmer 2 so that the light emitting unit 3 becomes darker, the dimming level of the dimming signal S1 output from the dimmer 2 is further reduced. When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 outputs the control signal S2 to the current adjusting unit 12. In this case, the dimming control unit 13 outputs a control signal S2 that causes the load current i1 to be i12. Output. As a result, as shown in FIG. 5, the gate voltage v1 becomes a constant value. In addition, the dimming control unit 13 generates a control signal S3 that decreases the load current i1 and outputs the control signal S3 to the drive circuit 111.

駆動回路１１１は、調光制御部１３からの制御信号Ｓ３が入力されると、第１制御回路１１１ａが制御信号Ｓ３に従ってトランジスタＱ１のオンデューティ比を小さくし、これにより負荷電流ｉ１が減少するため、発光部３の明るさがさらに低下する。なお、上述の動作は、負荷電流ｉ１がｉ１３以上で且つｉ１２より小さい範囲で行われる。   When the control signal S3 from the dimming control unit 13 is input to the drive circuit 111, the first control circuit 111a reduces the on-duty ratio of the transistor Q1 in accordance with the control signal S3, thereby reducing the load current i1. The brightness of the light emitting unit 3 is further reduced. The above-described operation is performed in a range where the load current i1 is i13 or more and smaller than i12.

また、発光部３がさらに暗くなるように、ユーザが調光器２を操作すると、調光器２から出力される調光信号Ｓ１の調光レベルもさらに小さくなる。調光制御部１３は、調光器２からの調光信号Ｓ１が入力されると、電流調整部１２に制御信号Ｓ２を出力するが、この場合、負荷電流ｉ１がｉ１２となる制御信号Ｓ２を出力する。その結果、図５に示すように、ゲート電圧ｖ１は一定値となる。また、調光制御部１３は、負荷電流ｉ１を減少させる制御信号Ｓ３を生成し、駆動回路１１１に出力する。   Further, when the user operates the dimmer 2 so that the light emitting unit 3 becomes darker, the dimming level of the dimming signal S1 output from the dimmer 2 is further reduced. When the dimming signal S1 from the dimmer 2 is input, the dimming control unit 13 outputs the control signal S2 to the current adjusting unit 12. In this case, the dimming control unit 13 outputs a control signal S2 that causes the load current i1 to be i12. Output. As a result, as shown in FIG. 5, the gate voltage v1 becomes a constant value. In addition, the dimming control unit 13 generates a control signal S3 that decreases the load current i1 and outputs the control signal S3 to the drive circuit 111.

駆動回路１１１は、調光制御部１３からの制御信号Ｓ３が入力されると、第２制御回路１１１ｂが制御信号Ｓ３に従ってＰＷＭ制御の休止期間を設定し、これにより負荷電流ｉ１が減少するため、発光部３の明るさがさらに低下する。ここに本実施形態では、負荷電流ｉ１＝ｉ１２となるときの調光レベルが所定値である。   When the control signal S3 from the dimming control unit 13 is input to the drive circuit 111, the second control circuit 111b sets the PWM control pause period in accordance with the control signal S3, thereby reducing the load current i1. The brightness of the light emitting unit 3 further decreases. Here, in the present embodiment, the dimming level when the load current i1 = i12 is a predetermined value.

上述のように、調光レベルが所定値以上である場合には電流調整部１２により調光制御を行ない、調光レベルが所定値より小さくなると電流調整部１２による調光制御に加えて直流電源部１１による調光制御を合わせて行なっている。その結果、より深い調光レベルまでＬＥＤ３１を点灯させることができ、且つＬＥＤ３１の明るさを広範囲に亘って滑らかに変化させることができる。   As described above, when the dimming level is equal to or higher than the predetermined value, the dimming control is performed by the current adjusting unit 12, and when the dimming level becomes smaller than the predetermined value, the DC power The dimming control by the unit 11 is also performed. As a result, the LED 31 can be lit up to a deeper dimming level, and the brightness of the LED 31 can be smoothly changed over a wide range.

なお本実施形態においても、トランスＴｒ１を用いたフライバックコンバータの代わりに、図４（ａ）〜図４（ｄ）に示すものを用いてもよく、何れの場合も、発光部３との間に電流調整部１２を設けることで同様の効果が得られる。また本実施形態においても、発光素子はＬＥＤに限定されるものではなく、例えば有機ＥＬ素子やレーザーダイオード（ＬＤ）などであってもよい。   Also in this embodiment, instead of the flyback converter using the transformer Tr1, the one shown in FIGS. 4A to 4D may be used. The same effect can be obtained by providing the current adjusting unit 12 in the circuit. Also in the present embodiment, the light emitting element is not limited to the LED, and may be, for example, an organic EL element or a laser diode (LD).

さらに本実施形態では、発光部３の調光レベルを下げる際に第１制御回路１１１ａによるＰＷＭ制御を先に行なったが、第２制御回路１１１ｂによるバースト制御を先に行なってもよく、また同時であってもよい。   Furthermore, in this embodiment, when the light control level of the light emitting unit 3 is lowered, the PWM control by the first control circuit 111a is performed first. However, the burst control by the second control circuit 111b may be performed first, and at the same time. It may be.

点灯装置１は、直流電源部１１と、直流電源部１１の出力端間に接続されるＬＥＤ３１及びトランジスタＱ２の直列回路と、電流調整部１２と、を備える。直流電源部１１は、出力電流の振幅を制御する第１制御回路１１１ａと電流を出力する期間と電流を出力しない期間の比率を制御する第２制御回路１１１ｂの少なくとも一方を有する。電流調整部１２は、トランジスタＱ２のゲートに印加する電圧を変化させることでＬＥＤ３１に流れる電流を調整する。外部からの調光信号Ｓ１による調光レベルが所定値以上である場合には、電流調整部１２によりＬＥＤ３１の明るさを制御する。また、調光レベルが所定値より小さい場合には、調光レベルが所定値である場合における電流調整部１２の制御状態を保ちつつ、第１制御回路１１１ａと第２制御回路１１１ｂの少なくとも一方によりＬＥＤ３１の明るさを制御する。   The lighting device 1 includes a DC power supply unit 11, a series circuit of an LED 31 and a transistor Q <b> 2 connected between output terminals of the DC power supply unit 11, and a current adjustment unit 12. The DC power supply unit 11 includes at least one of a first control circuit 111a that controls the amplitude of the output current and a second control circuit 111b that controls the ratio of the period during which the current is output and the period during which the current is not output. The current adjustment unit 12 adjusts the current flowing through the LED 31 by changing the voltage applied to the gate of the transistor Q2. When the dimming level by the dimming signal S1 from the outside is a predetermined value or more, the brightness of the LED 31 is controlled by the current adjusting unit 12. Further, when the dimming level is smaller than the predetermined value, at least one of the first control circuit 111a and the second control circuit 111b while maintaining the control state of the current adjusting unit 12 when the dimming level is the predetermined value. The brightness of the LED 31 is controlled.

（実施形態３）
照明器具Ａの実施形態について図７を参照しながら説明する。図７は本実施形態の照明器具Ａの施工状態を示す断面図であり、この照明器具Ａは、上述の実施形態１又は２で説明した点灯装置１と、発光部３と、器具本体４とを備える。点灯装置１は、調光器２との間が有線により接続されており、調光器２から出力される調光信号Ｓ１の調光レベルで発光部３を点灯させる。 (Embodiment 3)
An embodiment of the lighting fixture A will be described with reference to FIG. FIG. 7 is a cross-sectional view illustrating a construction state of the lighting fixture A of the present embodiment. The lighting fixture A includes the lighting device 1, the light emitting unit 3, and the fixture main body 4 described in the first or second embodiment. Is provided. The lighting device 1 is connected to the dimmer 2 by wire, and turns on the light emitting unit 3 at the dimming level of the dimming signal S1 output from the dimmer 2.

器具本体４は、例えばアルミダイカスト製品であって、一面（図７中の下面）が開口する有底円筒状に形成されており、天井材１００に設けた埋込孔１００ａを通して天井に埋込配設される。この器具本体４の筒内には、複数（図７では３個）のＬＥＤ３１が実装された基板３２が収納されており、器具本体４の開口端縁には、ＬＥＤ３１からの光を拡散させる光拡散板３３が取り付けられている。ここに本実施形態では、ＬＥＤ３１が実装された基板３２と光拡散板３３とで発光部３が構成されている。   The instrument body 4 is, for example, an aluminum die-cast product, and is formed in a bottomed cylindrical shape with one surface (the lower surface in FIG. 7) opened, and is embedded in the ceiling through an embedding hole 100a provided in the ceiling material 100. Established. A substrate 32 on which a plurality of (three in FIG. 7) LEDs 31 are mounted is accommodated in the cylinder of the instrument body 4, and light that diffuses light from the LEDs 31 is formed at the opening edge of the instrument body 4. A diffusion plate 33 is attached. Here, in the present embodiment, the light emitting unit 3 is configured by the substrate 32 on which the LEDs 31 are mounted and the light diffusion plate 33.

本実施形態の照明器具Ａでは、図７に示すように、発光部３を収納する器具本体４と点灯装置１とが間隔を空けて配置されており、発光部３と点灯装置１の間は、コネクタ６を介して電源線５により電気的に接続されている。このように、点灯装置１を器具本体４と別置きにした場合には、器具本体４の内部には発光部３のみを収納すればいいので、器具本体４の高さ寸法を低くすることができ、しかも点灯装置１の設置の自由度が向上するという利点がある。   In the lighting fixture A of the present embodiment, as shown in FIG. 7, the fixture body 4 that houses the light emitting unit 3 and the lighting device 1 are arranged with a space therebetween, and the space between the light emitting unit 3 and the lighting device 1 is between. The power line 5 is electrically connected via the connector 6. As described above, when the lighting device 1 is separated from the fixture body 4, it is only necessary to store the light emitting unit 3 inside the fixture body 4, so that the height dimension of the fixture body 4 can be reduced. In addition, there is an advantage that the degree of freedom of installation of the lighting device 1 is improved.

上述のように、実施形態１又は２で説明した点灯装置１を用いることによって、より深い調光レベルまで発光部３を点灯可能で且つ発光部３の明るさを広範囲に亘って滑らかに変化可能な照明器具Ａを提供することができる。   As described above, by using the lighting device 1 described in the first or second embodiment, the light emitting unit 3 can be lit to a deeper dimming level, and the brightness of the light emitting unit 3 can be smoothly changed over a wide range. Luminaire A can be provided.

なお、本実施形態では点灯装置１を器具本体４と別置きにしたが、器具本体４と一体に点灯装置１を設けてもよい。また、本実施形態では有線式の調光器２を用いたが、赤外線や電波等による無線式の調光器を用いてもよく、本実施形態に限定されない。   In the present embodiment, the lighting device 1 is provided separately from the fixture body 4, but the lighting device 1 may be provided integrally with the fixture body 4. Further, although the wired dimmer 2 is used in the present embodiment, a wireless dimmer using infrared rays, radio waves, or the like may be used, and is not limited to the present embodiment.

照明器具Ａは、点灯装置１を備えている。   The lighting fixture A includes a lighting device 1.

１１ 直流電源部
１２ 電流調整部
３１ ＬＥＤ（発光素子）
１１１ａ 第１制御回路
１１１ｂ 第２制御回路
Ｑ２ トランジスタ（スイッチ素子）
Ｓ１ 調光信号 11 DC power supply unit 12 Current adjustment unit 31 LED (light emitting element)
111a First control circuit 111b Second control circuit Q2 Transistor (switch element)
S1 Dimming signal

Claims (2)

出力電流の振幅を制御する第１制御回路と電流を出力する期間と電流を出力しない期間の比率を制御する第２制御回路の少なくとも一方を有する直流電源部と、
前記直流電源部の出力端間に接続される発光素子及びスイッチ素子の直列回路と、
前記スイッチ素子の制御端子に印加する電圧を変化させることで前記発光素子に流れる電流を調整する電流調整部と、を備え、
外部からの調光信号による調光レベルが所定値以上である場合には、前記電流調整部により前記発光素子の明るさを制御し、
前記調光レベルが前記所定値より小さい場合には、前記調光レベルが前記所定値である場合における前記電流調整部の制御状態を保ちつつ、前記第１制御回路と前記第２制御回路の少なくとも一方により前記発光素子の明るさを制御することを特徴とする点灯装置。 A DC power supply unit having at least one of a first control circuit for controlling the amplitude of the output current and a second control circuit for controlling a ratio between a period for outputting the current and a period for not outputting the current;
A series circuit of a light emitting element and a switch element connected between the output ends of the DC power supply unit;
A current adjusting unit that adjusts a current flowing through the light emitting element by changing a voltage applied to a control terminal of the switch element;
When the dimming level by an external dimming signal is a predetermined value or more, the brightness of the light emitting element is controlled by the current adjustment unit,
When the dimming level is smaller than the predetermined value, at least one of the first control circuit and the second control circuit is maintained while maintaining the control state of the current adjustment unit when the dimming level is the predetermined value. A lighting device characterized in that the brightness of the light emitting element is controlled by one. 請求項１記載の点灯装置を備えていることを特徴とする照明器具。   A lighting apparatus comprising the lighting device according to claim 1.
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