JP2010040878A - Lighting device for light-emitting diode - Google Patents
Lighting device for light-emitting diode Download PDFInfo
- Publication number
- JP2010040878A JP2010040878A JP2008203610A JP2008203610A JP2010040878A JP 2010040878 A JP2010040878 A JP 2010040878A JP 2008203610 A JP2008203610 A JP 2008203610A JP 2008203610 A JP2008203610 A JP 2008203610A JP 2010040878 A JP2010040878 A JP 2010040878A
- Authority
- JP
- Japan
- Prior art keywords
- light
- chopper
- light emitting
- emitting diodes
- emitting diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Led Devices (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
本発明は、多数の発光ダイオードを点灯することができる発光ダイオード点灯装置に関する。 The present invention relates to a light emitting diode lighting device capable of lighting a large number of light emitting diodes.
発光ダイオードを多数の点灯する発光ダイオード点灯装置は既知である（例えば、特許文献１参照。）。特許文献１に記載された点灯回路は、交流の整流電圧を昇圧チョッパで昇圧し、かつ平滑化して複数の発光ダイオードからなる直列回路の複数を並列接続した発光ダイオードに供給して点灯し、昇圧チョッパを制御して調光できるようにするとともに、力率も改善できるようにしている。 A light-emitting diode lighting device that lights a large number of light-emitting diodes is known (for example, see Patent Document 1). The lighting circuit described in Patent Document 1 boosts an alternating rectified voltage with a boost chopper and smoothes it to supply a plurality of series circuits composed of a plurality of light-emitting diodes to light-emitting diodes connected in parallel. The chopper can be controlled and dimmed, and the power factor can be improved.
ところが、昇圧チョッパを用いて発光ダイオードを調光可能に点灯する回路構成においては、昇圧作用によって交流電圧のピーク値より高い直流電圧が発光ダイオードに印加されることになる。このため、一部の発光ダイオードが開放故障した場合、その開放端間に過電圧が印加されてアーク放電が生じる虞がある。 However, in a circuit configuration in which a light emitting diode is lit so as to be dimmable using a boost chopper, a DC voltage higher than the peak value of the AC voltage is applied to the light emitting diode by the boosting action. For this reason, when some of the light emitting diodes have an open failure, an overvoltage may be applied between the open ends to cause arc discharge.
また、複数の発光ダイオードからなる直列回路に接続する発光ダイオードの数を、その順方向電圧の総和が上記高い直流電圧に見合うようにするためには、直列する発光ダイオードの数を多くする必要がある。したがって、直列回路に接続する発光ダイオードの数が、その順方向電圧の総和が交流電圧のピーク値より低くなるような少ない数の発光ダイオードを接続することができない。 In order to make the number of light emitting diodes connected to a series circuit composed of a plurality of light emitting diodes so that the sum of the forward voltages corresponds to the high DC voltage, it is necessary to increase the number of light emitting diodes in series. is there. Therefore, it is impossible to connect a small number of light emitting diodes connected to the series circuit such that the sum of the forward voltages is lower than the peak value of the AC voltage.
本発明は、力率改善を行いながら負荷回路に直列接続する発光ダイオードの数に対する適合性の融通が利く発光ダイオード点灯装置を提供することを目的とする。 It is an object of the present invention to provide a light-emitting diode lighting device that is flexible in adaptability to the number of light-emitting diodes connected in series to a load circuit while improving the power factor.
本発明の発光ダイオード点灯装置は、整流化直流電源と；入力端が整流化直流電源に接続した昇圧チョッパと；入力端が昇圧チョッパの出力端に接続した降圧チョッパと；降圧チョッパの出力端に接続して点灯する複数個からなる直列回路の複数が並列接続した発光ダイオードと；発光ダイオードの複数の並列接続した複数の直列回路に流れる電流を等しくする定電流回路と；を具備していることを特徴としている。 The light-emitting diode lighting device of the present invention includes: a rectified DC power supply; a step-up chopper whose input terminal is connected to the rectified DC power supply; a step-down chopper whose input terminal is connected to the output terminal of the boost chopper; A plurality of series circuits that are connected and lit, and a plurality of series-connected light-emitting diodes; and a constant current circuit that equalizes a current flowing through the plurality of series-connected series circuits of light-emitting diodes. It is characterized by.
本発明は、以下の態様を許容する。 The present invention allows the following aspects.
整流化直流電源は、交流電源、例えば商用交流電源電圧を整流して発光ダイオードを点灯するための電力を直流の態様で後述する縦続接続された昇圧チョッパおよび降圧チョッパに供給する。整流の態様は、特段限定されないが、全波整流が好ましい。 The rectified DC power supply supplies an AC power supply, for example, power for rectifying a commercial AC power supply voltage to light a light emitting diode to a cascaded step-up chopper and step-down chopper described later in a DC mode. The mode of rectification is not particularly limited, but full wave rectification is preferable.
また、直流電源は、直流出力電圧が平滑化されていてもよい。しかし、後段の昇圧チョッパが平滑化手段を備えているので、交流電圧を整流しただけの非平滑な直流電圧を出力する構成で差し支えない。 Further, the DC power supply may have a smoothed DC output voltage. However, since the subsequent step-up chopper is provided with smoothing means, it may be configured to output a non-smooth DC voltage obtained by rectifying the AC voltage.
昇圧チョッパは、整流化直流電源の出力を昇圧する。また、整流化直流電源に接続する交流電源から流入する電流の力率を改善する作用をも奏することが許容される。すなわち、昇圧チョッパのスイッチング素子がオン動作のときにインダクタに充電され、オフ動作のときにインダクタに蓄積された電磁エネルギーがフライホイールダイオードを介して平滑コンデンサへ放出されることによって平滑コンデンサが充電され、昇圧して平滑化された直流電圧を平滑コンデンサの両端間から出力する。この動作において、整流化直流電源電圧波形に比例的な入力電流が上記電圧に同期して交流電源から流入するので、力率が改善される。 The boost chopper boosts the output of the rectified DC power supply. Further, it is allowed to improve the power factor of the current flowing from the AC power source connected to the rectified DC power source. That is, the inductor is charged when the switching element of the step-up chopper is on, and the electromagnetic energy stored in the inductor is discharged to the smoothing capacitor via the flywheel diode when the switching element is off. The DC voltage that has been boosted and smoothed is output from both ends of the smoothing capacitor. In this operation, since the input current proportional to the rectified DC power supply voltage waveform flows from the AC power supply in synchronization with the voltage, the power factor is improved.
また、昇圧チョッパは、スイッチング素子のオンデューティを変化させると、その昇圧比が変化するので、出力電圧を単独で、または後述する降圧チョッパと協調して、後述する調光信号に応じて変化させることで調光動作を行う際の出力可変手段として利用することができる。 Further, since the step-up chopper changes its step-up ratio when the on-duty of the switching element is changed, the output voltage is changed according to a dimming signal described later alone or in cooperation with the step-down chopper described later. Thus, it can be used as an output variable means when performing the dimming operation.
さらに、昇圧チョッパは、インダクタとスイッチング素子が直列接続し、スイッチング素子と並列にフライホイールダイオードおよび平滑コンデンサの直列回路を接続した回路構成からなる一般的な回路構成であることが許容される。また、用いるスイッチング素子は、本発明において特段限定されないので、電流制御形のスイッチング素子および電圧制御形のスイッチング素子のいずれであってもよい。しかし、例えばＦＥＴ（電界効果形トランジスタ）およびＩＧＢＴなどのゲート電圧制御形のスイッチング素子であると、変換効率が高くなるので、特に好適である。 Further, the step-up chopper is allowed to have a general circuit configuration including a circuit configuration in which an inductor and a switching element are connected in series, and a series circuit of a flywheel diode and a smoothing capacitor is connected in parallel with the switching element. The switching element to be used is not particularly limited in the present invention, and may be either a current-controlled switching element or a voltage-controlled switching element. However, for example, a gate voltage control type switching element such as an FET (field effect transistor) and an IGBT is particularly preferable because the conversion efficiency is increased.
降圧チョッパは、昇圧チョッパからの直流出力電圧を降圧して、負荷に適合する所望の出力電圧に電圧変換する回路手段である。また、降圧チョッパの出力電圧を後述する調光信号に応じて可変にして発光ダイオードを調光点灯するように構成することができる。 The step-down chopper is circuit means for stepping down a DC output voltage from the step-up chopper and converting the voltage into a desired output voltage suitable for a load. Further, the output voltage of the step-down chopper can be made variable in accordance with a dimming signal, which will be described later, and the light emitting diode can be dimmed.
また、降圧チョッパは、一般に用いられている回路構成であることを許容する。すなわち、スイッチング素子、およびフライホイールダイオードの直列回路が直流入力端に接続し、フライホイールダイオードの両端にインダクタおよび平滑コンデンサの直列回路が接続し、平滑コンデンサの両端から降圧された直流出力を得る回路構成を用いることができる。 Further, the step-down chopper allows a circuit configuration that is generally used. That is, a circuit in which a series circuit of a switching element and a flywheel diode is connected to a DC input terminal, a series circuit of an inductor and a smoothing capacitor is connected to both ends of the flywheel diode, and a DC output stepped down from both ends of the smoothing capacitor is obtained. A configuration can be used.
さらに、降圧チョッパは、これを臨界モードで動作することにより、変換効率が高くなるので、本発明の実施において臨界モードをさせるのが好ましい。 Further, since the step-down chopper operates in the critical mode to increase the conversion efficiency, it is preferable to perform the critical mode in the implementation of the present invention.
さらにまた、マイコンを主体とする制御手段を用いて降圧チョッパを制御するのが好ましい。マイコンを用いることにより、制御手段を小形化して、しかも降圧チョッパの出力電圧値や停止などの制御信号を所望、かつ容易に設定することができる。 Furthermore, it is preferable to control the step-down chopper using a control unit mainly composed of a microcomputer. By using the microcomputer, the control means can be miniaturized, and the control signal such as the output voltage value or stop of the step-down chopper can be set as desired and easily.
発光ダイオードは、負荷として降圧チョッパの出力端に接続し、その出力電流により付勢されて点灯する。降圧チョッパの出力端に接続する発光ダイオードは、その複数が直列接続した直列回路の複数が並列接続して負荷回路を構成している。 The light emitting diode is connected to the output terminal of the step-down chopper as a load, and is lit by being energized by the output current. The light emitting diodes connected to the output terminal of the step-down chopper constitute a load circuit by connecting a plurality of series circuits in which a plurality of light emitting diodes are connected in series.
なお、直列回路に接続する発光ダイオードの数および並列回路の数は特段限定されない。また、発光ダイオードの発光特性およびパッケージ態様なども特段限定されないので、既知の各種発光特性、パッケージ態様および定格などを適宜選択して用いることができる。 The number of light emitting diodes connected to the series circuit and the number of parallel circuits are not particularly limited. In addition, since the light emitting characteristics, package mode, and the like of the light emitting diode are not particularly limited, various known light emitting characteristics, package modes, ratings, and the like can be appropriately selected and used.
定電流回路は、それぞれ複数の発光ダイオードからなる直列回路の複数が並列接続して負荷回路を構成しているが、複数の直列回路に流れる電流を互いに等しくするための回路手段である。本発明において、定電流回路の回路構成は特段限定されない。例えば、カレントミラー定電流回路、ウイルソン定電流回路などのトランジスタを用いて定電流動作を行わせる回路構成のものを適宜用いることができる。 The constant current circuit is a circuit means for equalizing currents flowing through a plurality of series circuits, although a plurality of series circuits each composed of a plurality of light emitting diodes are connected in parallel to constitute a load circuit. In the present invention, the circuit configuration of the constant current circuit is not particularly limited. For example, a circuit configuration that performs constant current operation using transistors such as a current mirror constant current circuit and a Wilson constant current circuit can be used as appropriate.
本発明によれば、昇圧チョッパで整流化直流電圧を昇圧し、さらに降圧チョッパで降圧して、その出力端に複数個からなる直列回路の複数が並列接続した発光ダイオードを接続し、かつ定電流回路によって複数の直列回路に流れる電流を等しくすることにより、多数の発光ダイオードを均一に発光させるとともに発光ダイオードの直列数に対する適合性の融通が利く発光ダイオード点灯装置を提供することができる。 According to the present invention, a rectified DC voltage is boosted by a boost chopper, further stepped down by a step-down chopper, a light emitting diode having a plurality of series circuits connected in parallel is connected to the output end thereof, and a constant current By making the currents flowing in the plurality of series circuits equal by the circuit, it is possible to provide a light emitting diode lighting device that allows a large number of light emitting diodes to emit light uniformly and has flexibility in adaptability to the number of light emitting diodes in series.
以下、図面を参照して本発明を実施するための形態を説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
図１および図２は、本発明における一実施の形態を示し、図１は発光ダイオード点灯装置の回路図、図２は降圧チョッパの臨界モードを説明するインダクタに流れる電流の波形図である。 1 and 2 show an embodiment of the present invention, FIG. 1 is a circuit diagram of a light-emitting diode lighting device, and FIG. 2 is a waveform diagram of a current flowing through an inductor for explaining a critical mode of a step-down chopper.
本形態において、発光ダイオード点灯装置は、整流化直流電源ＲＤＣ、昇圧チョッパＢＵＣ、降圧チョッパＳＤＣ、発光ダイオードＬＥＤ、定電流回路ＣＣＲ、調光信号出力手段ＤＳＧおよび制御手段ＣＣを具備して構成されていて、商用交流電源ＡＣから給電される。 In this embodiment, the light-emitting diode lighting device includes a rectified DC power supply RDC, a step-up chopper BUC, a step-down chopper SDC, a light-emitting diode LED, a constant current circuit CCR, a dimming signal output means DSG, and a control means CC. Power is supplied from the commercial AC power source AC.
整流化直流電源ＲＤＣは、交流入力端が商用交流電源ＡＣに接続したブリッジ形全波整流回路Ｒｅｃからなり、非平滑直流電圧を出力する。 The rectified DC power supply RDC is composed of a bridge-type full-wave rectifier circuit Rec having an AC input terminal connected to a commercial AC power supply AC, and outputs a non-smooth DC voltage.
昇圧チョッパＢＵＣは、整流化直流電源ＲＤＣの直流出力端に接続したインダクタＬ１およびスイッチング素子Ｑ１の直列回路、スイッチング素子Ｑ１に並列接続したフライホイールダイオードＤ１および平滑コンデンサＣ１の直列回路、ならびに出力電圧検出回路ＶＤを備えていて、後述する制御手段ＣＣの制御によって昇圧動作および力率改善動作を行う。なお、スイッチング素子Ｑ１は、ＭＯＳＦＥＴからなる。出力電圧検出回路ＶＤは、平滑コンデンサＣ１に並列接続した電圧分圧回路から分圧された出力電圧を取り出して、後述する制御手段ＣＣに制御入力する。上記電圧分圧回路は、抵抗器Ｒ１およびＲ２の直列回路で構成され、抵抗器Ｒ２の端子電圧が出力される。 The step-up chopper BUC includes a series circuit of an inductor L1 and a switching element Q1 connected to the DC output terminal of the rectified DC power supply RDC, a series circuit of a flywheel diode D1 and a smoothing capacitor C1 connected in parallel to the switching element Q1, and output voltage detection. A circuit VD is provided, and a boosting operation and a power factor correction operation are performed under the control of the control means CC described later. The switching element Q1 is made of a MOSFET. The output voltage detection circuit VD takes out the divided output voltage from a voltage dividing circuit connected in parallel to the smoothing capacitor C1, and inputs it to the control means CC described later. The voltage dividing circuit is constituted by a series circuit of resistors R1 and R2, and a terminal voltage of the resistor R2 is output.
降圧チョッパＳＤＣは、昇圧チョッパＢＵＣの出力端である平滑コンデンサＣ１の両端間に接続したスイッチング素子Ｑ２およびフライホイールダイオードＤ２の直列回路、フライホイールダイオードＤ２に並列接続したインダクタＬ２および平滑コンデンサＣ２の直列回路、ならびに負荷電流検出回路ＩＤを備えていて、後述する制御手段ＣＣの制御によって降圧動作を行う。なお、スイッチング素子Ｑ２は、ＭＯＳＦＥＴからなる。また、負荷電流検出回路ＩＤは、負荷電流に比例的な入力電流を抵抗器Ｒ３で検出して制御手段ＣＣに制御入力するように構成されている。 The step-down chopper SDC is a series circuit of a switching element Q2 and a flywheel diode D2 connected between both ends of a smoothing capacitor C1, which is an output end of the step-up chopper BUC, and a series of an inductor L2 and a smoothing capacitor C2 connected in parallel to the flywheel diode D2. A circuit and a load current detection circuit ID are provided, and a step-down operation is performed under the control of the control means CC described later. Switching element Q2 is made of a MOSFET. Further, the load current detection circuit ID is configured to detect an input current proportional to the load current with a resistor R3 and control-input it to the control means CC.
発光ダイオードＬＥＤは、その複数が直列接続した直列回路の複数、例えば図示のように３個が並列接続してなり、かつ負荷電流検出回路ＩＤを経由して降圧チョッパＳＤＣの出力端である平滑コンデンサＣ２の両端に接続している。 The light-emitting diode LED is a smoothing capacitor which is a plurality of series circuits in which a plurality of LEDs are connected in series, for example, three in parallel as shown in the figure, and is an output terminal of the step-down chopper SDC via a load current detection circuit ID Connected to both ends of C2.
定電流回路ＣＣＲは、発光ダイオードＬＥＤの並列接続した複数の直列回路に流れる負荷電流を等しくするもので、本形態においてはカレントミラー定電流回路を用いて構成されている。すなわち、発光ダイオードＬＥＤの並列接続した複数の直列回路にそれぞれ直列にトランジスタＱ３および抵抗器Ｒ５の直列回路を挿入し、発光ダイオードＬＥＤの並列接続した複数の直列回路のそれぞれに第２のトランジスタＱ４を直列に挿入し、かつ各トランジスタＱ３のベースを抵抗器Ｒ４を共通に経由して降圧チョッパＳＤＣの出力端の正極に接続して定電流回路ＣＣＲが構成されている。 The constant current circuit CCR equalizes load currents flowing through a plurality of series circuits connected in parallel with the light emitting diodes LED, and is configured using a current mirror constant current circuit in this embodiment. That is, a series circuit of a transistor Q3 and a resistor R5 is inserted in series into a plurality of series circuits connected in parallel with the light emitting diode LED, and a second transistor Q4 is connected to each of the plurality of series circuits connected in parallel with the light emitting diode LED. A constant current circuit CCR is configured by inserting in series and connecting the base of each transistor Q3 to the positive terminal of the output end of the step-down chopper SDC via a resistor R4 in common.
調光信号出力手段ＤＳＧは、発光ダイオードＬＥＤを調光点灯する場合に配設される調光信号を生成して出力する手段である。なお、調光しない場合には配設していなくてもよい。調光信号出力手段ＤＳＧの配設位置は、昇圧チョッパＳＵＣおよび降圧チョッパＳＤＣを含む発光ダイオード点灯装置の主要部に近接した位置、例えば上記主要部と同一の配線基板に実装されている態様でもよい。また、上記主要部から離間した位置に配設されるのであってもよい。 The dimming signal output unit DSG is a unit that generates and outputs a dimming signal disposed when the light emitting diode LED is dimmed. In addition, when not adjusting light, it does not need to arrange | position. The arrangement position of the dimming signal output means DSG may be a position close to the main part of the light emitting diode lighting device including the step-up chopper SUC and the step-down chopper SDC, for example, mounted on the same wiring board as the main part. . Further, it may be arranged at a position separated from the main part.
また、調光信号出力手段ＤＳＧは、出力する調光信号の形態が特段限定されない。例えば、調光度に応じてパルスのデューティが変化するデューティ信号、調光度をディジタル化したディジタル信号および調光度に応じて電圧値が変化する可変電圧信号などを選択的に適宜採用することができる。さらに、調光信号出力手段ＤＳＧから出力される調光信号は、連続的に変化してもよいし、段階的に変化してもよい。本形態において、調光信号は、調光割合に応じてデューティが変化する電圧パルス列からなる。 Further, the dimming signal output means DSG is not particularly limited in the form of the dimming signal to be output. For example, a duty signal whose pulse duty changes according to the dimming degree, a digital signal obtained by digitizing the dimming degree, a variable voltage signal whose voltage value changes according to the dimming degree, and the like can be selectively employed as appropriate. Further, the dimming signal output from the dimming signal output means DSG may change continuously or stepwise. In the present embodiment, the dimming signal is composed of a voltage pulse train whose duty changes in accordance with the dimming ratio.
制御手段ＣＣは、昇圧チョッパＢＵＣおよび降圧チョッパＳＤＣを制御する手段であり、発光ダイオードＬＥＤを調光点灯する場合には、調光信号出力手段ＤＳＧから出力される調光信号に応じて降圧チョッパＳＤＣおよび昇圧チョッパＢＵＣの少なくとも一方の出力を制御して発光ダイオードＬＥＤを調光点灯させるための調光制御動作を行わせることができる。なお、昇圧チョッパＢＵＣと降圧チョッパＳＤＣとの制御を統合的に行う必要はなく、両者を格別に制御することができる。例えば、昇圧チョッパＢＵＣの一部として予め専用の制御手段を一体的含んだ構成のものを用いることができる。 The control means CC is means for controlling the step-up chopper BUC and the step-down chopper SDC. When the light emitting diode LED is dimmed, the step-down chopper SDC is controlled according to the dimming signal output from the dimming signal output means DSG. The dimming control operation for dimming the light emitting diode LED by controlling the output of at least one of the boost chopper BUC can be performed. Note that it is not necessary to integrally control the step-up chopper BUC and the step-down chopper SDC, and both can be controlled exceptionally. For example, a configuration in which a dedicated control unit is integrated in advance as a part of the boost chopper BUC can be used.
調光制御動作を行わせる態様において、降圧チョッパＳＤＣおよび昇圧チョッパＢＵＣの少なくとも一方の出力制御は、制御手段ＣＣ内に設定した所定の調光特性および調光信号出力手段から出力される調光信号の相関に基づいて行われる。なお、調光特性は、予め所望に応じて適宜設定しておくことができる。例えば、発光ダイオードＬＥＤの光量と調光度とが連続的、かつ直線的に変化する調光特性にしたり、発光ダイオードＬＥＤの光量と調光度とが所定の非直線的な変化をする調光特性にしたり、さらには発光ダイオードＬＥＤの光量が段階的に変化する調光特性にしたりすることができる。 In the aspect in which the dimming control operation is performed, the output control of at least one of the step-down chopper SDC and the step-up chopper BUC is performed by a predetermined dimming characteristic set in the control unit CC and a dimming signal output from the dimming signal output unit. Based on the correlation. The dimming characteristics can be appropriately set as desired in advance. For example, the dimming characteristic is such that the light quantity and the dimming degree of the light emitting diode LED change continuously and linearly, or the dimming characteristic in which the light quantity and the dimming degree of the light emitting diode LED change in a predetermined non-linear manner. In addition, it is possible to achieve a dimming characteristic in which the light amount of the light emitting diode LED changes stepwise.
また、制御手段ＣＣは、マイコンを主体として構成されていている。昇圧チョッパＢＵＣを制御するためには、昇圧チョッパＢＵＣのスイッチング素子Ｑ１にパルス電圧からなる駆動信号を供給する。また、昇圧チョッパＢＵＣの出力電圧検出回路ＶＤから制御入力される出力電圧が所定値になるように帰還制御して駆動信号のデューティを所定に制御する。 Further, the control means CC is composed mainly of a microcomputer. In order to control the boost chopper BUC, a drive signal composed of a pulse voltage is supplied to the switching element Q1 of the boost chopper BUC. Also, feedback control is performed so that the output voltage controlled and input from the output voltage detection circuit VD of the step-up chopper BUC becomes a predetermined value, thereby controlling the duty of the drive signal to a predetermined value.
降圧チョッパＳＤＣを制御するためには、そのスイッチング素子Ｑ２にパルス電圧からなる駆動信号を供給する。また、降圧チョッパＳＤＣの負荷電流検出回路ＩＤから制御入力される負荷電流が一定になるように帰還制御するとともに、調光する場合には調光信号に応じて駆動信号をＰＷＭ制御する。 In order to control the step-down chopper SDC, a drive signal composed of a pulse voltage is supplied to the switching element Q2. In addition, feedback control is performed so that the load current controlled and input from the load current detection circuit ID of the step-down chopper SDC is constant, and in the case of dimming, the drive signal is PWM-controlled according to the dimming signal.
次に、本形態の発光ダイオード点灯装置の回路動作を説明する。すなわち、昇圧チョッパＢＵＣが動作することにより、商用交流電源ＡＣの電圧より高くなるように昇圧され、かつ出力電圧検出回路ＶＤから得た帰還電圧を用いて帰還制御された直流電圧が昇圧チョッパＢＵＣから出力される。また、発光ダイオード点灯装置の力率を改善することもできる。 Next, the circuit operation of the light emitting diode lighting device of this embodiment will be described. That is, by operating the boost chopper BUC, the DC voltage boosted to be higher than the voltage of the commercial AC power supply AC and feedback-controlled using the feedback voltage obtained from the output voltage detection circuit VD is generated from the boost chopper BUC. Is output. In addition, the power factor of the light emitting diode lighting device can be improved.
昇圧チョッパＢＵＣの出力電圧は、降圧チョッパＳＤＣの入力端に印加される。これにより、降圧チョッパＳＤＣは、降圧動作を行う。すなわち、図２に時間ｔが横軸で、電流値が縦軸の波形図に示すように、スイッチング素子Ｑ２がＯＮしている期間ＴＯＮにスイッチング素子Ｑ２および平滑コンデンサＣ２を経由してインダクタＬ２に増加電流ＩＩが電源側から流れて電磁エネルギーがインダクタＬ２に蓄積される。次に、スイッチング素子Ｑ２がＯＦＦしている期間ＴＯＦＦになると、インダクタＬ２に蓄積された電磁エネルギーがフライホイールダイオードＤ２を経由して放出されて減少電流ＩＤが同方向に流れて平滑コンデンサＣ２が充電される。減少電流が０になったときにスイッチング素子Ｑ２が再びＯＮして、以後上記と同じ回路動作が繰り返される。このときの降圧チョッパＳＤＣの動作は、臨界モードである。 The output voltage of the step-up chopper BUC is applied to the input terminal of the step-down chopper SDC. Thereby, the step-down chopper SDC performs a step-down operation. In other words, the horizontal axis represents the time t in Figure 2, so that the current value is shown in the waveform diagram of the vertical axis, the inductor L2 via the switching element Q2 and the smoothing capacitor C2 during the period T ON of the switching element Q2 is ON The increased current I I flows from the power source side, and electromagnetic energy is accumulated in the inductor L2. Next, when the switching element Q2 is turned OFF , the electromagnetic energy accumulated in the inductor L2 is released via the flywheel diode D2, and the reduced current ID flows in the same direction to cause the smoothing capacitor C2. Is charged. When the reduced current becomes zero, the switching element Q2 is turned on again, and thereafter the same circuit operation as described above is repeated. The operation of the step-down chopper SDC at this time is a critical mode.
そうして、負荷の発光ダイオードＬＥＤに対して降圧チョッパＳＤＣにおいて所要値に調整された直流電圧がその出力端に現れる。その結果、降圧チョッパＳＤＣの負荷として出力端に接続された発光ダイオードＬＥＤに負荷電流が流れるので、発光ダイオードＬＥＤが点灯する。このときの点灯は、降圧チョッパＳＤＣの負荷電流検出回路ＩＤと制御手段ＣＣの協働によって定電流制御下で行われる。 Thus, a DC voltage adjusted to a required value in the step-down chopper SDC appears at the output terminal of the light emitting diode LED of the load. As a result, a load current flows through the light emitting diode LED connected to the output terminal as a load of the step-down chopper SDC, so that the light emitting diode LED is turned on. The lighting at this time is performed under constant current control by the cooperation of the load current detection circuit ID of the step-down chopper SDC and the control means CC.
発光ダイオードＬＥＤの並列接続した複数の直列回路に流れる負荷電流は、定電流回路ＣＣＲによる定電流動作で等しくなる。すなわち、第１のトランジスタＱ３に抵抗器Ｒ１を経由して流れる電流が一定になり、第２のトランジスタＱ４、Ｑ４に対して一定のベース電流が供給されるので、発光ダイオードＬＥＤの並列接続した複数の直列回路に流れる負荷電流が等しくなる。 The load currents flowing in the plurality of series circuits connected in parallel with the light emitting diodes LED become equal in the constant current operation by the constant current circuit CCR. That is, since the current flowing through the resistor R1 to the first transistor Q3 is constant and a constant base current is supplied to the second transistors Q4 and Q4, a plurality of light emitting diodes LED connected in parallel are provided. The load currents flowing through the series circuit are equal.
また、調光信号出力手段ＤＳＧから送出された調光信号が降圧チョッパＳＤＣの制御部に入力すると、当該制御部は調光信号に対応してＰＷＭ制御された駆動信号を生成して降圧チョッパＳＤＣのスイッチング素子Ｑ２に供給する。その結果、負荷電流の定電流制御の基準値が調光信号に応じて変更されるため、発光ダイオードＬＥＤは、調光信号に対応する光出力の調光点灯を行う。 Also, when the dimming signal sent from the dimming signal output means DSG is input to the control unit of the step-down chopper SDC, the control unit generates a PWM-controlled drive signal corresponding to the dimming signal and generates the step-down chopper SDC. To the switching element Q2. As a result, since the reference value for constant current control of the load current is changed according to the dimming signal, the light emitting diode LED performs dimming lighting of the light output corresponding to the dimming signal.
ＢＵＣ…昇圧チョッパ、ＣＣ…制御手段、ＣＣＲ…定電流回路、ＤＳＧ…調光信号出力手段、ＩＤ…負荷電流検出回路、ＬＥＤ…発光ダイオード、ＲＤＣ…整流化直流電源、ＳＤＣ…降圧チョッパ、ＶＤ…出力電圧検出回路 BUC ... Boost chopper, CC ... Control means, CCR ... Constant current circuit, DSG ... Dimming signal output means, ID ... Load current detection circuit, LED ... Light emitting diode, RDC ... Rectified DC power supply, SDC ... Step-down chopper, VD ... Output voltage detection circuit
Claims (2)
入力端が整流化直流電源に接続した昇圧チョッパと；
入力端が昇圧チョッパの出力端に接続した降圧チョッパと；
降圧チョッパの出力端に接続して点灯する、複数個からなる直列回路の複数が並列接続した発光ダイオードと；
発光ダイオードの複数の並列接続した複数の直列回路に流れる電流を等しくする定電流回路と；
を具備していることを特徴とする発光ダイオード点灯装置。 A rectified DC power supply;
A boost chopper whose input terminal is connected to a rectified DC power supply;
A step-down chopper whose input end is connected to the output end of the step-up chopper;
A light emitting diode in which a plurality of series circuits connected in parallel are connected to the output terminal of the step-down chopper and connected in parallel;
A constant current circuit for equalizing currents flowing in a plurality of parallel-connected series circuits of light emitting diodes;
A light-emitting diode lighting device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008203610A JP2010040878A (en) | 2008-08-06 | 2008-08-06 | Lighting device for light-emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008203610A JP2010040878A (en) | 2008-08-06 | 2008-08-06 | Lighting device for light-emitting diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2010040878A true JP2010040878A (en) | 2010-02-18 |
Family
ID=42013085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008203610A Pending JP2010040878A (en) | 2008-08-06 | 2008-08-06 | Lighting device for light-emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2010040878A (en) |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010051017A1 (en) | 2010-02-25 | 2011-08-25 | Murakami Corp. | Door mirror for a motor vehicle |
| JP2011171232A (en) * | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
| JP2011171230A (en) * | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
| GB2478284A (en) * | 2010-03-01 | 2011-09-07 | Multiload Technology Ltd | AC-DC converter having adjustable phase chopping angle |
| JP2011216316A (en) * | 2010-03-31 | 2011-10-27 | Toshiba Lighting & Technology Corp | Led lighting device, and led luminaire |
| JP2011249124A (en) * | 2010-05-26 | 2011-12-08 | Panasonic Electric Works Co Ltd | Overcurrent prevention type power unit and luminaire using the same |
| CN102300363A (en) * | 2010-06-28 | 2011-12-28 | 东芝照明技术株式会社 | Power source unit and lighting fixture |
| EP2410821A2 (en) | 2010-07-20 | 2012-01-25 | Panasonic Electric Works Co., Ltd. | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| JP2012033611A (en) * | 2010-07-29 | 2012-02-16 | Panasonic Electric Works Co Ltd | Led lighting device, illumination device including led lighting device, and illumination system including led lighting device |
| JP2012049273A (en) * | 2010-08-26 | 2012-03-08 | Toshiba Lighting & Technology Corp | Dc power supply device and led lamp system |
| JP2012059662A (en) * | 2010-09-13 | 2012-03-22 | Panasonic Corp | Lighting device of semiconductor light-emitting element and lighting fixture using the same |
| JP2012064431A (en) * | 2010-09-16 | 2012-03-29 | Panasonic Corp | Semiconductor light-emitting element lighting device and lighting apparatus using the same |
| JP2012084489A (en) * | 2010-10-14 | 2012-04-26 | Koha Co Ltd | Led lighting device and led illuminating device |
| JP2012133942A (en) * | 2010-12-20 | 2012-07-12 | Panasonic Corp | Led lighting device, and illumination apparatus using the same |
| JP2012199002A (en) * | 2011-03-18 | 2012-10-18 | Panasonic Corp | Solid light-emitting element lighting device and lighting fixture using the same |
| JP2012238755A (en) * | 2011-05-12 | 2012-12-06 | Panasonic Corp | Solid light source lighting device and lighting apparatus using the same |
| JP2013026176A (en) * | 2011-07-26 | 2013-02-04 | Panasonic Corp | Led lighting device and lighting apparatus using the same |
| JP5188643B1 (en) * | 2012-08-23 | 2013-04-24 | 株式会社共進電機製作所 | Power supply |
| JP2013099072A (en) * | 2011-10-31 | 2013-05-20 | Panasonic Corp | Power supply device and led driving device |
| JP2014509792A (en) * | 2011-03-28 | 2014-04-21 | コーニンクレッカ フィリップス エヌ ヴェ | Driving apparatus and method for driving a load, in particular an LED assembly |
| US8742681B2 (en) | 2009-11-09 | 2014-06-03 | Toshiba Lighting & Technology Corporation | LED lighting device, illuminating device and power supply therefore having a normally-on type switching element |
| US8872444B2 (en) | 2011-04-13 | 2014-10-28 | Panasonic Corporation | Lighting device for solid-state light source and illumination apparatus including same |
| JP2015228720A (en) * | 2014-05-30 | 2015-12-17 | ミネベア株式会社 | Self-excited resonance power factor improvement circuit and light source driver |
| JP2016048637A (en) * | 2014-08-27 | 2016-04-07 | パナソニックＩｐマネジメント株式会社 | Lighting device and luminaire |
| JP2016522540A (en) * | 2013-04-19 | 2016-07-28 | テクニカル コンシューマー プロダクツ インコーポレイテッド | 3-stage switching omnidirectional LED lamp drive circuit |
| CN108684111A (en) * | 2018-07-25 | 2018-10-19 | 河南天海电器有限公司 | A kind of constant-current source power module of adaptive matrix formula LED headlamp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001351789A (en) * | 2000-06-02 | 2001-12-21 | Toshiba Lighting & Technology Corp | Drive device for light-emitting diode |
| JP2003339159A (en) * | 2002-05-20 | 2003-11-28 | Meiji Natl Ind Co Ltd | Power unit and hid lamp drive circuit |
| JP2007080771A (en) * | 2005-09-16 | 2007-03-29 | Nec Lighting Ltd | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting |
| JP2007096287A (en) * | 2005-08-31 | 2007-04-12 | Toshiba Lighting & Technology Corp | Led lighting device and led substrate module |
-
2008
- 2008-08-06 JP JP2008203610A patent/JP2010040878A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001351789A (en) * | 2000-06-02 | 2001-12-21 | Toshiba Lighting & Technology Corp | Drive device for light-emitting diode |
| JP2003339159A (en) * | 2002-05-20 | 2003-11-28 | Meiji Natl Ind Co Ltd | Power unit and hid lamp drive circuit |
| JP2007096287A (en) * | 2005-08-31 | 2007-04-12 | Toshiba Lighting & Technology Corp | Led lighting device and led substrate module |
| JP2007080771A (en) * | 2005-09-16 | 2007-03-29 | Nec Lighting Ltd | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting |
Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9155143B2 (en) | 2009-11-09 | 2015-10-06 | Toshiba Lighting & Technology Corporation | LED lighting device and illuminating device |
| US9392655B2 (en) | 2009-11-09 | 2016-07-12 | Toshiba Lighting & Technology Corporation | LED lighting device and illuminating device |
| US8742681B2 (en) | 2009-11-09 | 2014-06-03 | Toshiba Lighting & Technology Corporation | LED lighting device, illuminating device and power supply therefore having a normally-on type switching element |
| JP2011171232A (en) * | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
| JP2011171230A (en) * | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
| DE102010051017A1 (en) | 2010-02-25 | 2011-08-25 | Murakami Corp. | Door mirror for a motor vehicle |
| GB2478284A (en) * | 2010-03-01 | 2011-09-07 | Multiload Technology Ltd | AC-DC converter having adjustable phase chopping angle |
| GB2478284B (en) * | 2010-03-01 | 2017-05-17 | Multiload Tech Ltd | Power supply apparatus |
| JP2011216316A (en) * | 2010-03-31 | 2011-10-27 | Toshiba Lighting & Technology Corp | Led lighting device, and led luminaire |
| JP2011249124A (en) * | 2010-05-26 | 2011-12-08 | Panasonic Electric Works Co Ltd | Overcurrent prevention type power unit and luminaire using the same |
| CN102300363A (en) * | 2010-06-28 | 2011-12-28 | 东芝照明技术株式会社 | Power source unit and lighting fixture |
| KR101277412B1 (en) * | 2010-06-28 | 2013-06-20 | 도시바 라이텍쿠 가부시키가이샤 | Power supply device and Lighting fixture |
| EP2410821A2 (en) | 2010-07-20 | 2012-01-25 | Panasonic Electric Works Co., Ltd. | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| JP2012033611A (en) * | 2010-07-29 | 2012-02-16 | Panasonic Electric Works Co Ltd | Led lighting device, illumination device including led lighting device, and illumination system including led lighting device |
| JP2012049273A (en) * | 2010-08-26 | 2012-03-08 | Toshiba Lighting & Technology Corp | Dc power supply device and led lamp system |
| JP2012059662A (en) * | 2010-09-13 | 2012-03-22 | Panasonic Corp | Lighting device of semiconductor light-emitting element and lighting fixture using the same |
| JP2012064431A (en) * | 2010-09-16 | 2012-03-29 | Panasonic Corp | Semiconductor light-emitting element lighting device and lighting apparatus using the same |
| JP2012084489A (en) * | 2010-10-14 | 2012-04-26 | Koha Co Ltd | Led lighting device and led illuminating device |
| JP2012133942A (en) * | 2010-12-20 | 2012-07-12 | Panasonic Corp | Led lighting device, and illumination apparatus using the same |
| JP2012199002A (en) * | 2011-03-18 | 2012-10-18 | Panasonic Corp | Solid light-emitting element lighting device and lighting fixture using the same |
| JP2014509792A (en) * | 2011-03-28 | 2014-04-21 | コーニンクレッカ フィリップス エヌ ヴェ | Driving apparatus and method for driving a load, in particular an LED assembly |
| US8872444B2 (en) | 2011-04-13 | 2014-10-28 | Panasonic Corporation | Lighting device for solid-state light source and illumination apparatus including same |
| JP2012238755A (en) * | 2011-05-12 | 2012-12-06 | Panasonic Corp | Solid light source lighting device and lighting apparatus using the same |
| JP2013026176A (en) * | 2011-07-26 | 2013-02-04 | Panasonic Corp | Led lighting device and lighting apparatus using the same |
| JP2013099072A (en) * | 2011-10-31 | 2013-05-20 | Panasonic Corp | Power supply device and led driving device |
| JP5188643B1 (en) * | 2012-08-23 | 2013-04-24 | 株式会社共進電機製作所 | Power supply |
| JP2016522540A (en) * | 2013-04-19 | 2016-07-28 | テクニカル コンシューマー プロダクツ インコーポレイテッド | 3-stage switching omnidirectional LED lamp drive circuit |
| JP2015228720A (en) * | 2014-05-30 | 2015-12-17 | ミネベア株式会社 | Self-excited resonance power factor improvement circuit and light source driver |
| CN105186852A (en) * | 2014-05-30 | 2015-12-23 | 美蓓亚株式会社 | Self-excitation resonant power factor correction circuit and light source drive device |
| CN105186852B (en) * | 2014-05-30 | 2018-03-13 | 美蓓亚株式会社 | Self-excitation resonance type power factor correction circuit and light source drive device |
| JP2016048637A (en) * | 2014-08-27 | 2016-04-07 | パナソニックＩｐマネジメント株式会社 | Lighting device and luminaire |
| CN108684111A (en) * | 2018-07-25 | 2018-10-19 | 河南天海电器有限公司 | A kind of constant-current source power module of adaptive matrix formula LED headlamp |
| CN108684111B (en) * | 2018-07-25 | 2024-05-07 | 河南天海电器有限公司 | Constant current source power supply module of self-adaptive matrix type LED headlight |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2010040878A (en) | Lighting device for light-emitting diode | |
| US11323036B2 (en) | Forward converter having a primary-side current sense circuit | |
| JP5263503B2 (en) | Light emitting diode lighting device | |
| US9699844B2 (en) | Multichannel constant current LED driving circuit, driving method and LED driving power | |
| JP4796849B2 (en) | DC power supply, light-emitting diode power supply, and lighting device | |
| JP5564239B2 (en) | LED drive circuit | |
| JP5110197B2 (en) | LED driving device and LED lighting device | |
| KR20120056162A (en) | Led driving apparatus | |
| JP2008205357A (en) | Light emitting apparatus | |
| CN102573217A (en) | Mains dimmable LED driver circuits | |
| JP2012084489A (en) | Led lighting device and led illuminating device | |
| KR20110095639A (en) | Led lamp module | |
| US9030114B2 (en) | LED drive circuit and LED driving method | |
| JP5853190B2 (en) | Solid state light emitting device driving device and lighting device | |
| US9723668B2 (en) | Switching converter and lighting device using the same | |
| JP5660936B2 (en) | Light emitting element drive circuit | |
| KR101472824B1 (en) | Power supply unit for led lighting fixtures | |
| JP6791486B2 (en) | Light emitting element drive device and its drive method | |
| JP7425399B2 (en) | Power supplies and lighting equipment | |
| JP7241312B2 (en) | Lighting systems, lighting control systems and luminaires | |
| JP7133787B2 (en) | Lighting systems, lighting control systems and luminaires | |
| JP2024037451A (en) | Lighting devices and luminaires | |
| KR101360656B1 (en) | LED driving circuit | |
| JP2020057453A (en) | Lighting device and illumination device | |
| JP2019212535A (en) | Light source lighting device and lighting fixture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20110310 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120815 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20121002 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20130220 |