JP6057551B2 - LED power supply circuit and LED lighting device using the same - Google Patents

LED power supply circuit and LED lighting device using the same Download PDF

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JP6057551B2
JP6057551B2 JP2012128535A JP2012128535A JP6057551B2 JP 6057551 B2 JP6057551 B2 JP 6057551B2 JP 2012128535 A JP2012128535 A JP 2012128535A JP 2012128535 A JP2012128535 A JP 2012128535A JP 6057551 B2 JP6057551 B2 JP 6057551B2
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稔 松本
稔 松本
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Eye Lighting Systems Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明はＬＥＤ電源回路及びそれを用いたＬＥＤ照明装置に関し、特に、電源投入時の調光動作を改善したＬＥＤ電源回路及びそれを用いたＬＥＤ照明装置に関する。   The present invention relates to an LED power supply circuit and an LED lighting device using the LED power supply circuit, and more particularly to an LED power supply circuit with improved dimming operation at power-on and an LED lighting device using the LED power supply circuit.

近年、調光機能付きのＬＥＤ照明が広く使用されている。そのようなＬＥＤ照明に搭載されるＬＥＤ電源回路は一般に、調光機能がないＬＥＤ電源回路と同様の電力供給回路部と、調光制御用の調光回路部を備え、双方は同じ入力電源（商用電源）から給電される。そのため、入力電源投入時に電力供給回路部が調光回路部よりも先に起動すると、調光制御が効かない状態で電力供給回路部がＬＥＤに電力供給を行うことになる。従って、例えば、所定の調光レベルに設定された状態で入力電源が導入されても、ＬＥＤ電源回路はまず全光状態での点灯を行い、その後調光回路部が起動した後に所定の調光レベルでの点灯を行うことになる。即ち、使用者においては、電源投入後に一旦明るくなってから暗い状態が得られるため、視覚的に違和感があるという問題があった。   In recent years, LED lighting with a dimming function has been widely used. An LED power circuit mounted on such LED lighting generally includes a power supply circuit unit similar to an LED power circuit without a dimming function and a dimming circuit unit for dimming control, both of which have the same input power source ( Power is supplied from a commercial power source. Therefore, when the power supply circuit unit is activated before the dimming circuit unit when the input power is turned on, the power supply circuit unit supplies power to the LED without the dimming control being effective. Therefore, for example, even if the input power supply is introduced in a state where the predetermined dimming level is set, the LED power supply circuit first turns on in the all-light state, and then the predetermined dimming after the dimming circuit unit is activated. It will be lit at the level. That is, the user has a problem that the user feels visually uncomfortable because a dark state is obtained after the light is turned on once after the power is turned on.

この問題に対して、例えば特許文献１は、電力供給回路部である電源部（１）及び調光回路部である調光部（２）を有する照明装置（１００）において、入力電源投入時に電源部が調光部に対して遅れて動作を開始する構成を開示する。具体的には、調光部が電源投入時とほぼ同時に動作を開始する一方、電源部が電源電圧の上昇を検出して電源電圧が所定値を超えた後の所定時間経過後にＬＥＤへの電力供給動作を開始するように構成される。この所定時間は数百ｍｓｅｃ〜１ｓｅｃ程度である。   To deal with this problem, for example, Patent Document 1 discloses a lighting device (100) having a power supply unit (1) that is a power supply circuit unit and a dimming unit (2) that is a dimming circuit unit. The structure which a part starts operation | movement late with respect to a light control part is disclosed. Specifically, while the dimming unit starts to operate almost at the same time as when the power is turned on, the power to the LED is detected after a lapse of a predetermined time after the power supply unit detects an increase in the power supply voltage and the power supply voltage exceeds a predetermined value. It is configured to start the feeding operation. This predetermined time is about several hundred msec to 1 sec.

また、同文献は、いわゆるフェードイン点灯を行う構成を開示する。同文献（特に図７）の点灯装置は、ＬＥＤに電力を供給する電源部（１）及び外部からの調光信号に応じて電源部を制御する調光部（２ａ）を備える。電源投入直後に、電源部は内部で電源電圧の上昇を検出すると、調光レベルが５％に対応するアナログ信号を調光部に入力し、その後、徐々に上昇する調光レベルに対応するアナログ信号を調光部に入力する。調光部は、この電源投入直後の期間においては、外部からの調光信号にかかわらずアナログ信号に従って電源部を制御する。   Further, this document discloses a configuration for performing so-called fade-in lighting. The lighting device of the same document (particularly FIG. 7) includes a power supply unit (1) that supplies power to the LED and a light control unit (2a) that controls the power supply unit according to a light control signal from the outside. Immediately after the power is turned on, when the power supply unit detects an increase in the power supply voltage, an analog signal corresponding to a dimming level of 5% is input to the dimming unit, and then the analog corresponding to the dimming level that gradually increases. The signal is input to the dimmer. In the period immediately after the power is turned on, the dimmer unit controls the power unit according to the analog signal regardless of the dimming signal from the outside.

特許第４８６４１２２号公報Japanese Patent No. 4864122

特許文献１の構成は、電源部の動作開始を遅延させるために数百ｍｓｅｃ〜１ｓｅｃ程度の遅延時間を生成する遅延回路を必要とする。しかし、同文献の遅延回路は調光部の動作には関与しない。従って、電源部の動作開始と調光部の動作開始の時間差を適切に設定及び管理することが難しかった。この問題は、フェードイン点灯を行う場合も同じである。   The configuration of Patent Document 1 requires a delay circuit that generates a delay time of about several hundred msec to 1 sec in order to delay the start of operation of the power supply unit. However, the delay circuit of this document does not participate in the operation of the dimmer. Therefore, it is difficult to appropriately set and manage the time difference between the operation start of the power supply unit and the operation start of the light control unit. This problem is the same when performing fade-in lighting.

より具体的には、調光部の動作開始タイミングは調光部の回路構成によって異なり、例えば、遅い時定数のフィルタ回路等を用いる調光部では、電源投入から動作開始までの期間は長くなる。従って、遅延回路による遅延時間が短いと、電源部の動作開始が調光部の動作開始よりも先になることが保障されないこととなる。逆に、電源部と調光部の動作開始の前後関係を確実なものとするために遅延時間を長くすると、起動時間の短い調光部が搭載されている場合に、調光部の動作開始から電源部の動作開始までの期間が不要に長くなる。そのため、特にフェードイン点灯する場合には、電源を投入してから所望の明るさが得られるまでの時間が非常に長くなり、ユーザにとってはかえって使い勝手の悪いものとなってしまう。   More specifically, the operation start timing of the dimming unit varies depending on the circuit configuration of the dimming unit. For example, in a dimming unit using a filter circuit with a slow time constant, the period from turning on the power to the start of operation becomes longer. . Therefore, if the delay time by the delay circuit is short, it cannot be guaranteed that the operation start of the power supply unit is ahead of the operation start of the dimming unit. Conversely, if the delay time is increased in order to ensure the relationship between the start of operation of the power supply unit and the light control unit, the operation of the light control unit starts when a light control unit with a short startup time is installed. The period from the start to the operation of the power supply unit becomes unnecessarily long. For this reason, particularly in the case of fading in, the time from when the power is turned on until the desired brightness is obtained becomes very long, which is rather unusable for the user.

また、同文献の構成においては、電源電圧を検出する検出回路として、１００Ｈｚ又は１２０Ｈｚの全波整流電圧を平滑化する積分回路が必要となる。従って、電源投入時からの電源部が動作開始するまでの実際の遅延時間は検出回路の積分時定数による遅延時間と上記の遅延回路による遅延時間とを合計した遅延時間となる。しかし、積分時定数による遅延時間は電源周波数や電源電圧変動によっても異なるものとなり、実際の遅延時間を正確に設定及び管理することは難しい。   Further, in the configuration of this document, an integration circuit that smoothes a full-wave rectified voltage of 100 Hz or 120 Hz is required as a detection circuit that detects a power supply voltage. Therefore, the actual delay time from when the power is turned on until the power supply unit starts operating is the sum of the delay time due to the integration time constant of the detection circuit and the delay time due to the delay circuit. However, the delay time due to the integration time constant varies depending on the power supply frequency and power supply voltage fluctuation, and it is difficult to accurately set and manage the actual delay time.

そこで、本発明は、調光機能を有するＬＥＤ電源回路において、調光設定の状態で電源が投入される場合に、確実に調光始動を行うとともに、電源投入から設定調光率に到達するまでの時間を適切に設定及び管理することができる構成を提供することを課題とする。   Therefore, in the LED power supply circuit having a dimming function, the present invention reliably starts the dimming when the power is turned on in the dimming setting state, and until the set dimming rate is reached after the power is turned on. It is an object of the present invention to provide a configuration capable of appropriately setting and managing the time.

本発明のＬＥＤ電源回路は、交流入力電圧を直流化する直流電源回路、直流電源回路の出力電圧からＬＥＤ電流を生成してＬＥＤに供給する電流制限回路、外部からの調光信号を受けて調光の外部指令値を出力する調光回路、及び外部指令値が入力され、電流制限回路の動作を制御する制御部を備える。制御部は第１の制御回路及び第２の制御回路を備え、第１の制御回路は、給電されて動作を開始すると第１の信号を生成し、外部指令値が示す調光率と内部設定値が示す調光率とを比較して低い方の調光率に対応する第２の信号を生成するように構成される。第２の制御回路は、第１の信号を受けて動作を開始し、第２の信号が示す調光率に基づいて電流制限回路を制御するように構成される。内部設定値が示す調光率は、第１の信号の生成時からの経過時間に対して増加するように設定される。   The LED power supply circuit of the present invention includes a DC power supply circuit that converts an AC input voltage to DC, a current limiting circuit that generates LED current from the output voltage of the DC power supply circuit and supplies the LED current to the LED, and a dimming signal received from the outside. A dimming circuit that outputs an external command value of light and a control unit that receives the external command value and controls the operation of the current limiting circuit are provided. The control unit includes a first control circuit and a second control circuit. The first control circuit generates a first signal when power is supplied and starts operation, and the dimming rate and the internal setting indicated by the external command value Comparing with the dimming rate indicated by the value, the second signal corresponding to the lower dimming rate is generated. The second control circuit is configured to start the operation upon receiving the first signal, and to control the current limiting circuit based on the dimming rate indicated by the second signal. The dimming rate indicated by the internal setting value is set so as to increase with respect to the elapsed time since the generation of the first signal.

上記ＬＥＤ電源回路は、さらに、直流電源回路の出力電圧から制御部に制御電源を供給する制御電源生成回路を備え、第１及び第２の制御回路が制御電源生成回路から給電される。   The LED power supply circuit further includes a control power supply generation circuit that supplies control power to the control unit from the output voltage of the DC power supply circuit, and the first and second control circuits are supplied with power from the control power supply generation circuit.

また、内部設定値の増加が調光率０％に対応する値から開始されるように設定されるようにしてもよい。   Alternatively, the internal setting value may be set to start from a value corresponding to a dimming rate of 0%.

また、本発明のＬＥＤ照明装置は、上記のＬＥＤ電源回路、ＬＥＤ電源回路から給電されるＬＥＤ、及び少なくともＬＥＤ電源回路を内包する筐体を備える。   Moreover, the LED lighting device of the present invention includes the LED power supply circuit described above, an LED fed from the LED power supply circuit, and a housing that includes at least the LED power supply circuit.

本発明の実施例によるＬＥＤ電源回路を示す図である。It is a figure which shows the LED power supply circuit by the Example of this invention. 本発明の実施例によるＬＥＤ電源回路の動作を説明する図である。It is a figure explaining operation | movement of the LED power supply circuit by the Example of this invention. 本発明の実施例によるＬＥＤ電源回路の動作を示すフローチャートである。4 is a flowchart illustrating an operation of the LED power supply circuit according to the embodiment of the present invention. 本発明の変形例によるＬＥＤ電源回路の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the LED power supply circuit by the modification of this invention.

実施例．
図１に本発明の実施例によるＬＥＤ電源回路１の回路構成図を示す。ＬＥＤ電源回路１は、直流電源回路２、電流制限回路３、制御電源生成回路５、調光回路６、第１の制御回路７及び第２の制御回路８を備える。なお、制御回路７及び８をまとめて制御部というものとする。また、実際の回路素子が上記のどの回路に属するかは便宜的なものであり、上記の区分けが本発明を拘束するものではない。このＬＥＤ電源回路１、ＬＥＤ４、及び少なくともＬＥＤ電源回路１が実装された基板を内包する筐体（不図示）によりＬＥＤ照明装置が構成される。ＬＥＤ４はＬＥＤ電源回路１と同じ基板に実装される等して一体化されていてもよいし、ケーブルを介して別置されてもよい。 Example.
FIG. 1 shows a circuit configuration diagram of an LED power supply circuit 1 according to an embodiment of the present invention. The LED power circuit 1 includes a DC power circuit 2, a current limiting circuit 3, a control power generation circuit 5, a dimming circuit 6, a first control circuit 7, and a second control circuit 8. The control circuits 7 and 8 are collectively referred to as a control unit. In addition, it is convenient for which circuit the actual circuit element belongs to, and the above classification does not constrain the present invention. The LED power supply circuit 1, the LED 4, and a housing (not shown) including at least a substrate on which the LED power supply circuit 1 is mounted constitute an LED lighting device. The LED 4 may be integrated by being mounted on the same substrate as the LED power supply circuit 1 or may be separately provided via a cable.

なお、本明細書においては、調光率が高いほど（１００％に近づくほど）明るい点灯が行われ、調光率が低いほど（０％に近づくほど）暗い点灯が行われるものとして調光率が定義される。   In this specification, it is assumed that brighter lighting is performed as the dimming rate is higher (closer to 100%), and darker lighting is performed as the dimming rate is lower (closer to 0%). Is defined.

直流電源回路２は、整流回路２１、昇圧チョッパ部２２及び平滑コンデンサ２３を備える。整流回路２１はダイオードブリッジ等からなり、入力ＡＣ電源（例えば、商用電源）を全波整流する。昇圧チョッパ部２２及び平滑コンデンサ２３は昇圧及び平滑し、力率改善回路としても機能する。   The DC power supply circuit 2 includes a rectifier circuit 21, a boost chopper unit 22, and a smoothing capacitor 23. The rectifier circuit 21 includes a diode bridge and the like, and full-wave rectifies an input AC power supply (for example, a commercial power supply). The step-up chopper unit 22 and the smoothing capacitor 23 perform step-up and smoothing, and also function as a power factor correction circuit.

電流制限回路３はトランジスタ３１、コイル３２、ダイオード３３、コンデンサ３４及び電流検出抵抗３５を備え、降圧コンバータ回路を構成する。トランジスタ３１がＯＮのとき、電流は主に、平滑コンデンサ２３の充電電圧から、トランジスタ３１、コイル３２、ＬＥＤ４及び抵抗３５に流れる。トランジスタ３１がＯＦＦのとき、電流は主に、コイル３２に蓄えられたエネルギーから、ＬＥＤ４、電流検出抵抗３５及びダイオード３３に流れる。ここで、後述する制御回路８が、電流検出抵抗３５に流れる電流、即ち、ＬＥＤ電流が目標値に一致するようにトランジスタ３１のＯＮ幅を制御し、ＰＷＭ制御を行う。なお、調光制御（特に低調光率における制御）においては、トランジスタ３１の制御はＰＷＭだけでなく周波数制御を行ってもよい。周波数制御の場合、トランジスタ３１のスイッチング周波数が高いほどコイル３２のインピーダンスが高くなり、ＬＥＤ電流が絞られる。   The current limiting circuit 3 includes a transistor 31, a coil 32, a diode 33, a capacitor 34, and a current detection resistor 35, and constitutes a step-down converter circuit. When the transistor 31 is ON, current flows mainly from the charging voltage of the smoothing capacitor 23 to the transistor 31, the coil 32, the LED 4, and the resistor 35. When the transistor 31 is OFF, current flows mainly from the energy stored in the coil 32 to the LED 4, the current detection resistor 35, and the diode 33. Here, the control circuit 8 described later performs PWM control by controlling the ON width of the transistor 31 so that the current flowing through the current detection resistor 35, that is, the LED current matches the target value. In dimming control (particularly control at a low dimming rate), the transistor 31 may be controlled not only by PWM but also by frequency control. In the case of frequency control, the higher the switching frequency of the transistor 31, the higher the impedance of the coil 32, and the LED current is reduced.

制御電源生成回路５は電圧レギュレータ等からなり、平滑コンデンサ２３の出力電圧を降圧して、１０〜１５Ｖｄｃ程度の定電圧を生成する。制御電源生成回路５は調光回路６、制御回路７及び８に制御電源を供給する。なお、本発明において、調光回路６は必ずしも制御電源生成回路５から給電される必要はなく、別途の給電系から電力供給されるようにしてもよい。   The control power supply generation circuit 5 includes a voltage regulator and the like, and steps down the output voltage of the smoothing capacitor 23 to generate a constant voltage of about 10 to 15 Vdc. The control power generation circuit 5 supplies control power to the dimming circuit 6 and the control circuits 7 and 8. In the present invention, the dimming circuit 6 is not necessarily supplied with power from the control power generation circuit 5, and may be supplied with power from a separate power supply system.

調光回路６は、調光信号入力回路６１、調光信号正規化回路６２及び積分回路６３を備える。調光信号入力回路６１は、外部からのＰＷＭ調光信号を受け、例えば、フォトカプラ等の絶縁回路によってＬＥＤ電源回路１のグランドを基準としたＰＷＭ調光信号を生成する。調光信号正規化回路６２は調光信号入力回路６１からのＰＷＭ調光信号を正規化する。例えば、調光信号正規化回路６２では、最も高い調光率（全光）を示す調光信号が入力された場合には、最大のＯＮ幅のＰＷＭ正規化調光信号が生成され、最も低い調光率を示す調光信号が入力された場合には、最小のＯＮ幅のＰＷＭ正規化調光信号が生成される。このように、調光信号正規化回路６２では、調光率に応じたＰＷＭ正規化調光信号が生成される。なお、ここでは調光率に対してＰＷＭ正規化調光信号のＯＮ幅が単調増加する構成を示すが、後述する制御回路７における論理の極性に応じて、調光率に対してＰＷＭ正規化調光信号のＯＮ幅が単調減少するようにしてもよい。積分回路６３は調光信号正規化回路６２のＰＷＭ出力を積分して平滑化する。即ち、積分回路６３では、調光率に比例又は逆比例した直流化調光信号（以下、「外部指令値ｄ２」という）が生成される。   The dimming circuit 6 includes a dimming signal input circuit 61, a dimming signal normalization circuit 62, and an integration circuit 63. The dimming signal input circuit 61 receives an external PWM dimming signal and generates a PWM dimming signal based on the ground of the LED power supply circuit 1 by an insulating circuit such as a photocoupler. The dimming signal normalization circuit 62 normalizes the PWM dimming signal from the dimming signal input circuit 61. For example, in the dimming signal normalization circuit 62, when the dimming signal indicating the highest dimming rate (all light) is input, the PWM normalized dimming signal having the maximum ON width is generated and the lowest. When a dimming signal indicating a dimming rate is input, a PWM normalized dimming signal having a minimum ON width is generated. Thus, the dimming signal normalization circuit 62 generates a PWM normalization dimming signal corresponding to the dimming rate. Here, a configuration in which the ON width of the PWM normalized dimming signal monotonously increases with respect to the dimming rate is shown. However, the PWM normalization with respect to the dimming rate is performed according to the polarity of the logic in the control circuit 7 described later. The ON width of the dimming signal may be monotonously decreased. The integrating circuit 63 integrates and smoothes the PWM output of the dimming signal normalizing circuit 62. That is, the integrating circuit 63 generates a DC dimming signal proportional to or inversely proportional to the dimming rate (hereinafter referred to as “external command value d2”).

制御回路７は起動指令手段７１及び調光率決定手段７２を備える。起動指令手段７１は制御電源生成回路５からの給電を受け、動作を開始すると起動指令信号ｓ１を生成して制御回路８に入力する。調光率決定手段７２は、調光回路６の積分経路６３から入力される外部指令値ｄ２が示す調光率と内部設定値ｄ１が示す調光率とを比較して低い方の調光率に対応する調光出力信号ｓ２を生成するように構成される。制御回路７は上記の起動指令手段７１及び調光率決定手段７２の機能を備えたマイコンで構成されていてもよいし、マイコン及びＤ／Ａコンバータで構成して調光率決定手段７２のデジタル出力をＤ／Ａコンバータでアナログ値に変換して制御回路８に入力するように構成されていてもよい。   The control circuit 7 includes a start command unit 71 and a dimming rate determination unit 72. The start command means 71 receives power from the control power supply generation circuit 5 and starts the operation, generates a start command signal s1 and inputs it to the control circuit 8. The dimming rate determining means 72 compares the dimming rate indicated by the external command value d2 input from the integration path 63 of the dimming circuit 6 with the dimming rate indicated by the internal set value d1, and the lower dimming rate. Is configured to generate a dimming output signal s2 corresponding to. The control circuit 7 may be constituted by a microcomputer having the functions of the start command means 71 and the dimming rate determination means 72 described above, or may be constituted by a microcomputer and a D / A converter, and digital of the dimming rate determination means 72. The output may be converted to an analog value by a D / A converter and input to the control circuit 8.

本実施例においては、上記の調光率決定手段７２における内部設定値ｄ１が示す調光率は、起動指令信号ｓ１の生成時からの経過時間に対して０％から増加するように設定される。但し、内部設定値ｄ１が示す調光率は、０％から開始されるものに限られず、０〜２０％程度のうちの適切な調光率から開始されるものであってもよい。   In the present embodiment, the dimming rate indicated by the internal setting value d1 in the dimming rate determining means 72 is set so as to increase from 0% with respect to the elapsed time from the generation of the start command signal s1. . However, the dimming rate indicated by the internal setting value d1 is not limited to that starting from 0%, and may be started from an appropriate dimming rate of about 0 to 20%.

制御回路８はドライバ８１及び誤差増幅手段８２を備える。ドライバ８１は、制御電源生成回路５から給電される電源電圧が動作可能電圧に達しても、制御回路７の起動指令手段７１からの起動指令信号ｓ１が入力されるまではトランジスタ３１をＯＦＦに維持する。オペアンプ等からなる誤差増幅手段８２は、調光出力信号ｓ２が示す調光率を目標値として、電流検出抵抗３５に発生する検出値が目標値に一致するようにドライバ８１にＰＷＭ制御信号（及び必要に応じて周波数制御信号）を出力する。即ち、制御回路８は、制御回路７からの起動指令信号ｓ１を受けると動作を開始し、調光率決定手段７２からの調光出力信号ｓ２が示す調光率に従ってトランジスタ３１をＰＷＭ制御（及び必要に応じて周波数制御）してＬＥＤ電流を電流制御する。   The control circuit 8 includes a driver 81 and error amplification means 82. The driver 81 keeps the transistor 31 OFF until the start command signal s1 from the start command means 71 of the control circuit 7 is input even if the power supply voltage supplied from the control power generation circuit 5 reaches the operable voltage. To do. The error amplifying means 82 composed of an operational amplifier or the like uses the dimming rate indicated by the dimming output signal s2 as a target value, and sends a PWM control signal (and so on) to the driver 81 so that the detection value generated in the current detection resistor 35 matches the target value. Output a frequency control signal if necessary. That is, the control circuit 8 starts the operation when receiving the activation command signal s1 from the control circuit 7, and performs PWM control (and the PWM control of the transistor 31 according to the dimming rate indicated by the dimming output signal s2 from the dimming rate determining means 72. The frequency of the LED current is controlled as necessary.

図２に図１のＬＥＤ電源回路１の動作を示す。
ＡＣ電源がＬＥＤ電源回路１に投入され、ｔ０において、制御回路７及び８の電源電圧が動作可能電圧に達する。
ｔ１において、制御回路７からの起動指令信号ｓ１が制御回路８に入力されて電流制限回路４の動作が開始される。
ｔ１〜ｔ３の増光制御期間においては、制御回路７からの調光出力信号ｓ２を誤差増幅手段８２の目標値として制御回路８が電流制限回路３の動作を制御する。増光制御期間においては、上述したように、制御回路７（調光率決定手段７２）において、外部指令値ｄ２が示す調光率と内部設定値ｄ１が示す調光率とが比較されて低い方の調光率に対応する調光出力が行われる。ここで、内部設定値ｄ１（破線）が示す調光率は、点灯開始時ｔ１からの経過時間に比例して０％から増加するように設定されている。なお、増光制御期間ｔ１〜ｔ３の長さは０．５〜５．０秒程度であればよい。なお、内部設定値ｄ１及び外部指令値ｄ２がともに０％の場合は調光率０％で調光出力が行われるものとする。 FIG. 2 shows the operation of the LED power supply circuit 1 of FIG.
The AC power supply is turned on to the LED power supply circuit 1, and the power supply voltages of the control circuits 7 and 8 reach the operable voltage at t0.
At t1, the start command signal s1 from the control circuit 7 is input to the control circuit 8, and the operation of the current limiting circuit 4 is started.
In the dimming control period from t1 to t3, the control circuit 8 controls the operation of the current limiting circuit 3 using the dimming output signal s2 from the control circuit 7 as the target value of the error amplifying means 82. In the dimming control period, as described above, in the control circuit 7 (the dimming rate determining means 72), the dimming rate indicated by the external command value d2 is compared with the dimming rate indicated by the internal set value d1, whichever is lower. The dimming output corresponding to the dimming rate is performed. Here, the light control rate indicated by the internal set value d1 (broken line) is set to increase from 0% in proportion to the elapsed time from the lighting start time t1. Note that the length of the brightening control period t1 to t3 may be about 0.5 to 5.0 seconds. When both the internal set value d1 and the external command value d2 are 0%, the dimming output is performed with the dimming rate of 0%.

図２に示す例では、ｔ２の時点で、内部設定値ｄ１が外部指令値ｄ２を超えるのでｔ１〜ｔ２が実際の増光期間となり、ｔ２以降は外部指令値ｄ２に従った通常の調光点灯が行われる。
なお、図２では、内部設定値ｄ１が示す調光率が０〜１００％までほぼ一次関数的に上昇するものを示したが、調光率が高くなるほど調光率の上昇速度が速くなる構成としてもよい。調光率の高い領域では明るさの差が人の目に視認され難いので、その領域の増光期間を短縮するものである。 In the example shown in FIG. 2, since the internal set value d1 exceeds the external command value d2 at the time t2, t1 to t2 become an actual light-up period, and after t2, normal dimming lighting according to the external command value d2 is performed. Done.
In FIG. 2, the dimming rate indicated by the internal setting value d1 is shown to increase almost linearly from 0 to 100%. However, the higher the dimming rate, the faster the dimming rate increases. It is good. In a region with a high dimming rate, the difference in brightness is difficult to be visually recognized by the human eye, and therefore the light increase period in that region is shortened.

図３に、本実施例の制御部における動作を示すフローチャートの一例を示す。
電源が投入されると、ステップＳ１０において、制御回路７及び８の電源電圧が動作可能電圧に達する。 FIG. 3 shows an example of a flowchart showing the operation in the control unit of the present embodiment.
When the power is turned on, the power supply voltages of the control circuits 7 and 8 reach the operable voltage in step S10.

ステップＳ１５において、制御回路７は起動指令信号ｓ１、及び内部設定値ｄ１（本実施例ではｄ１の初期値は０％）からなる調光出力信号ｓ２を制御回路８に出力し、制御回路８は内部設定値ｄ１＝０で電流制限回路３の制御を開始する。   In step S15, the control circuit 7 outputs to the control circuit 8 a dimming output signal s2 comprising the start command signal s1 and the internal set value d1 (in this embodiment, the initial value of d1 is 0%). The control of the current limiting circuit 3 is started with the internal set value d1 = 0.

ステップＳ２０において、制御回路７は内部設定値ｄ１を１ステップ増分する。なお、ｄ１の増分最終値は１００％より大きいものとする。
ステップＳ２５において、制御回路７は、内部設定値ｄ１と外部指令値ｄ２とを比較する。外部指令値ｄ２が内部設定値ｄ１以上の場合（Ｓ２５、Ｎｏ）、処理はステップＳ３０に進み、外部指令値ｄ２が内部設定値ｄ１未満の場合（Ｓ２５、Ｙｅｓ）、処理はステップＳ３５に進む。 In step S20, the control circuit 7 increments the internal set value d1 by one step. Note that the final increment value of d1 is greater than 100%.
In step S25, the control circuit 7 compares the internal set value d1 with the external command value d2. If the external command value d2 is greater than or equal to the internal set value d1 (S25, No), the process proceeds to step S30. If the external command value d2 is less than the internal set value d1 (S25, Yes), the process proceeds to step S35.

ステップＳ３０において、制御回路７は内部設定値ｄ１からなる調光出力信号ｓ２を制御回路８に出力し、制御回路８が内部設定値ｄ１に従って電流制限回路３を制御する。そして、処理はステップＳ２５に戻る。   In step S30, the control circuit 7 outputs a dimming output signal s2 composed of the internal set value d1 to the control circuit 8, and the control circuit 8 controls the current limiting circuit 3 according to the internal set value d1. Then, the process returns to step S25.

ステップＳ３５において、制御回路７は外部指令値ｄ２からなる調光出力信号ｓ２を制御回路８に出力し、制御回路８が外部指令値ｄ２に従って電流制限回路３を制御する。その後、処理はステップＳ４０に進む。
ステップＳ４０及びそれ以降において、制御回路７及び８は通常の調光制御（全光点灯を含む）を行う。 In step S35, the control circuit 7 outputs a dimming output signal s2 composed of the external command value d2 to the control circuit 8, and the control circuit 8 controls the current limiting circuit 3 according to the external command value d2. Thereafter, the process proceeds to step S40.
In step S40 and thereafter, the control circuits 7 and 8 perform normal dimming control (including all-light lighting).

以上のように、本実施例の構成によると、調光機能を有するＬＥＤ電源回路において、調光設定の状態で電源が投入される場合に、各回路ブロックの動作遅延時間や電源仕様の影響を受けずに、確実に調光始動を行うことができる。また、低調光率から点灯を開始する場合も、所定の調光レベルに到達するまでの時間を適切に設定及び管理することができる。   As described above, according to the configuration of this embodiment, in the LED power supply circuit having the dimming function, when the power is turned on in the dimming setting state, the operation delay time of each circuit block and the influence of the power supply specifications are affected. Dimming can be reliably started without receiving the light. In addition, when lighting is started from a low dimming rate, it is possible to appropriately set and manage the time until the predetermined dimming level is reached.

変形例．
上記実施例では、外部からの調光信号が高い調光率を示す場合でも増光制御を行う例を示したが、本変形例では、外部からの調光信号が高い調光率（例えば、１００％・全光）を示している場合には増光制御期間を省略する構成を示す。
図４に本変形例のフローチャートを示す。本変形例のフローは、図３のフローに加えてステップＳ１１及びＳ１２を備える。 Modified example.
In the above-described embodiment, an example in which the dimming control is performed even when the external dimming signal exhibits a high dimming rate has been described. However, in the present modification, a dimming rate with a high dimming signal from the outside (for example, 100 % / Total light) indicates a configuration in which the light control period is omitted.
FIG. 4 shows a flowchart of this modification. The flow of this modification includes steps S11 and S12 in addition to the flow of FIG.

ステップＳ１０とステップＳ１５の間のステップＳ１１において、制御回路７は外部指令値ｄ２の示す調光率がα％（例えば、９０％）以上であるか否かを判断する。また、α＝１００として、制御回路７が、外部指令値ｄ２が全光を示すものか否かを判断するようにしてもよい。調光率がα％以上の場合（Ｓ１１、Ｙｅｓ）、処理はＳ１２に進み、それ以外の場合（Ｓ１１、Ｎｏ）はＳ１５に進む。即ち、ステップＳ１５は外部からの調光信号が調光率α％以上を示している場合は、調光率決定手段７１による比較動作が省略され（即ち、増光制御期間を設けることなく）、点灯開始時から通常の調光制御が行われる。   In step S11 between step S10 and step S15, the control circuit 7 determines whether or not the dimming rate indicated by the external command value d2 is α% (for example, 90%) or more. Alternatively, α = 100 may be used, and the control circuit 7 may determine whether or not the external command value d2 indicates all light. If the dimming rate is α% or more (S11, Yes), the process proceeds to S12, and otherwise (S11, No), the process proceeds to S15. That is, in step S15, when the dimming signal from the outside indicates the dimming rate α% or more, the comparison operation by the dimming rate determining means 71 is omitted (that is, without providing the dimming control period). Normal dimming control is performed from the beginning.

ステップＳ１２において、制御回路７は起動指令信号ｓ１、及び外部指令値ｄ２からなる調光出力信号ｓ２を制御回路８に出力し、制御回路８が外部指令値ｄ２に従って電流制限回路３の制御を開始する。その後、処理はステップＳ４０に進み、制御回路７及び８は通常の調光制御（全光点灯を含む）を行う。従って、例えば、外部からの調光信号が全光（１００≧α）を示しているような場合には、点灯開始後に増光期間を経ることなく全光点灯が行われる。   In step S12, the control circuit 7 outputs the start command signal s1 and the dimming output signal s2 including the external command value d2 to the control circuit 8, and the control circuit 8 starts controlling the current limiting circuit 3 according to the external command value d2. To do. Thereafter, the process proceeds to step S40, and the control circuits 7 and 8 perform normal dimming control (including all-light lighting). Therefore, for example, when the dimming signal from the outside indicates all light (100 ≧ α), all-light lighting is performed without passing through the light increase period after starting lighting.

このように、本変形例では、外部からの調光信号が低い調光率を指示している場合には増光制御が行われ、高い調光率を指示している場合には増光制御は行われない。従って、上記実施例で得られる効果に加えて、使用者は、高調光率始動時には高調光率状態を迅速に得ることができる。また、上記の調光率α＝１００の場合には、外部からの調光信号が調光点灯を指示している場合には増光制御が行われ、全光点灯を指示している場合には増光制御は行われない。従って、使用者は、増光期間の有無によって点灯開始時の調光指令の有無を知ることができる。   As described above, in this modified example, the dimming control is performed when the dimming signal from the outside indicates a low dimming rate, and the dimming control is performed when the high dimming rate is instructed. I will not. Therefore, in addition to the effects obtained in the above-described embodiment, the user can quickly obtain the high light rate state when starting the high light rate. Further, in the case of the above dimming rate α = 100, the dimming control is performed when the dimming signal from the outside instructs the dimming lighting, and when the dimming lighting is instructed, Brightening control is not performed. Therefore, the user can know the presence / absence of the dimming command at the start of lighting based on the presence / absence of the light-intensifying period.

上記実施例は本発明の最も好適な例を示すものであるが、本発明はその趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記実施例では、制御回路７と制御回路８を個別の制御回路で構成したが、双方を１つの制御部として統合してもよい。
また、上記実施例では、電流制限回路３として降圧チョッパ回路を示したが、フライバックコンバータ、フォワードコンバータ等の他の形式のスイッチング電源回路を用いてもよい。 The above embodiment shows the most preferable example of the present invention, but the present invention can be appropriately changed without departing from the gist thereof.
For example, in the above embodiment, the control circuit 7 and the control circuit 8 are configured as individual control circuits, but both may be integrated as one control unit.
In the above embodiment, the step-down chopper circuit is shown as the current limiting circuit 3. However, other types of switching power supply circuits such as a flyback converter and a forward converter may be used.

１．ＬＥＤ電源回路
２．直流電源回路
３．電流制限回路
４．ＬＥＤ
５．制御電源生成回路
６．調光回路
７．制御回路（第１の制御回路）
８．制御回路（第２の制御回路）
７１．起動指令手段
７２．調光率決定手段
８１．ドライバ
８２．誤差増幅手段 1. 1. LED power supply circuit 2. DC power supply circuit 3. Current limiting circuit LED
5. 5. Control power supply generation circuit 6. Dimming circuit Control circuit (first control circuit)
8). Control circuit (second control circuit)
71. Start command means 72. Dimming rate determining means 81. Driver 82. Error amplification means

Claims (4)

ＬＥＤ電源回路であって、
交流入力電圧を直流化する直流電源回路、
前記直流電源回路の出力電圧からＬＥＤ電流を生成してＬＥＤに供給する電流制限回路、
外部からの調光信号を受けて調光の外部指令値を出力する調光回路、及び
前記外部指令値が入力され、前記電流制限回路の動作を制御する制御部
を備え、
前記制御部が第１の制御回路及び第２の制御回路を備え、
前記第１の制御回路は、給電されて動作を開始すると第１の信号を生成し、前記外部指令値が示す調光率が所定値未満の場合には前記外部指令値が示す調光率と内部設定値が示す調光率とを比較して低い方の調光率に対応する第２の信号を生成し、前記外部指令値が示す調光率が前記所定値以上の場合には前記第２の信号として前記外部指令値が示す調光率を出力するように構成され、
前記第２の制御回路は、前記第１の信号を受けて動作を開始し、前記第２の信号が示す調光率に基づいて前記電流制限回路を制御するように構成され、
前記内部設定値が示す調光率が、前記第１の信号の生成時からの経過時間に対して増加するように設定され、調光率が高くなるほど調光率の上昇速度が速くなるように前記内部設定値が設定された、ＬＥＤ電源回路。 An LED power circuit,
DC power supply circuit that converts AC input voltage to DC,
A current limiting circuit for generating LED current from the output voltage of the DC power supply circuit and supplying the LED current to the LED;
A dimming circuit that receives a dimming signal from the outside and outputs an external command value for dimming, and a controller that receives the external command value and controls the operation of the current limiting circuit;
The control unit includes a first control circuit and a second control circuit,
Said first control circuit starts the power supply has been operating to generate a first signal, the external command value indicates the dimming ratio is front in the case of less than the predetermined value Kigaibu dimming rate command value is shown and by comparing the internal setting value indicates the dimming ratio form the second signal raw corresponding to the lower dimming rate, if the external command value indicates the dimming ratio of the above predetermined value The dimming rate indicated by the external command value is output as the second signal ,
The second control circuit is configured to start operation upon receiving the first signal, and to control the current limiting circuit based on a dimming rate indicated by the second signal;
The dimming rate indicated by the internal setting value is set so as to increase with respect to the elapsed time from the time of generation of the first signal, and as the dimming rate increases, the rate of increase of the dimming rate increases. An LED power supply circuit in which the internal set value is set. 請求項１に記載のＬＥＤ電源回路であって、さらに、前記直流電源回路の出力電圧から前記制御部に制御電源を供給する制御電源生成回路を備え、前記第１及び第２の制御回路が該制御電源生成回路から給電されるＬＥＤ電源回路。   2. The LED power supply circuit according to claim 1, further comprising a control power generation circuit that supplies a control power to the control unit from an output voltage of the DC power supply circuit, wherein the first and second control circuits include the control power generation circuit. LED power supply circuit fed by a control power supply generation circuit. 請求項１に記載のＬＥＤ電源回路において、前記内部設定値の増加が調光率０％に対応する値から開始されるように設定されたＬＥＤ電源回路。   2. The LED power supply circuit according to claim 1, wherein the increase in the internal set value is set to start from a value corresponding to a dimming rate of 0%. 請求項１から３のいずれか一項に記載のＬＥＤ電源回路、該ＬＥＤ電源回路から給電される前記ＬＥＤ、及び少なくとも該ＬＥＤ電源回路を内包する筐体を備えたＬＥＤ照明装置。   4. An LED lighting device comprising: the LED power supply circuit according to claim 1; the LED that is fed from the LED power supply circuit; and a housing that includes at least the LED power supply circuit.
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