JP2011003326A - Led lighting device - Google Patents

Led lighting device Download PDF

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JP2011003326A
JP2011003326A JP2009143843A JP2009143843A JP2011003326A JP 2011003326 A JP2011003326 A JP 2011003326A JP 2009143843 A JP2009143843 A JP 2009143843A JP 2009143843 A JP2009143843 A JP 2009143843A JP 2011003326 A JP2011003326 A JP 2011003326A
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Shinichi Suido
新一 水道
Yuichi Ikejiri
裕一 池尻
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Shihen Technical Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device with an LED not becoming bright or blinking when it is set to be dark.SOLUTION: The lighting device is provided with a dimmer 20 for adjusting brightness of an light emitting diode LED by phase-controlling of an AC voltage, an input smoothing circuit 40 for smoothing an output voltage of the dimmer 20, and an output smoothing circuit for supplying a DC current to the light emitting diode, and is further provided with an inverter circuit 50 for switching on/off the output voltage of the input smoothing circuit 40 to convert into an AC voltage and for outputting the AC voltage to the output smoothing circuit 60, a dimming signal generation circuit 70 for generating a dimming signal in accordance with the output voltage of the input smoothing circuit 40, an output current detecting circuit 80 for detecting a current flowing in the light emitting diode LED, and a dimming controlling circuit 90 for comparing a signal value of the dimming signal of the dimming signal generating circuit 70 with a detected current value of the output current detecting circuit 80 and outputs a differential voltage in accordance with the difference. The inverter circuit 50 controls an ON period of the output voltage in accordance with the differential voltage of the dimming controlling circuit 90.

Description

この発明は、発光ダイオードであるＬＥＤを点灯させるＬＥＤ点灯装置に関する。   The present invention relates to an LED lighting device for lighting an LED which is a light emitting diode.

従来から、トライアックを位相制御することにより調光を行うＬＥＤ点灯装置が知られている（特許文献１参照）。   2. Description of the Related Art Conventionally, an LED lighting device that performs dimming by controlling the phase of a triac is known (see Patent Document 1).

かかるＬＥＤ点灯装置は、交流電圧を位相制御するトライアックなどからなる位相制御調光器と、この位相制御調光器から出力される位相制御された交流電圧を整流して脈流電圧に変換する整流回路と、この整流回路の脈流電圧を平滑する平滑コンデンサと、この平滑コンデンサから出力される直流電圧を断続するためのトランスジスタと、このトランジスタをオン・オフするＰＭＷ制御回路と、トランジスタがオンしている間一次コイルに電流が流れるトランスと、このトランスの二次コイルに発生する交流電圧を整流するダイオードと、このダイオードから出力される整流電圧を平滑するとともにこの平滑した直流電圧で発光ダイオードを点灯させるコンデンサと、発光ダイオードに流れる電流を検出する電流検知抵抗と、前記整流回路から出力される脈流電圧に基づいてこの脈流電圧の導通幅を検出する導通幅検出回路等とを備えている。   Such an LED lighting device includes a phase control dimmer composed of a triac or the like for phase-controlling an AC voltage, and a rectification for rectifying the phase-controlled AC voltage output from the phase control dimmer to convert it into a pulsating voltage. Circuit, a smoothing capacitor for smoothing the pulsating voltage of the rectifier circuit, a transistor for intermittently connecting a DC voltage output from the smoothing capacitor, a PMW control circuit for turning on / off the transistor, and a transistor on A transformer in which a current flows in the primary coil during the operation, a diode for rectifying the AC voltage generated in the secondary coil of the transformer, and a light emitting diode that smoothes the rectified voltage output from the diode and uses the smoothed DC voltage A capacitor for lighting up, a current detection resistor for detecting a current flowing through the light emitting diode, and the rectifier circuit Based on the pulsating voltage et output and a conduction width detection circuit for detecting the conduction width of the pulsating voltage.

このＬＥＤ点灯装置によれば、ＰＭＷ制御回路は、発光ダイオードに流れる電流値が導通幅検出回路の検出結果に対応した値となるようにトランジスタのオン時間を制御して、発光ダイオードの明るさが所望の明るさに保たれるようにしたものである。   According to this LED lighting device, the PMW control circuit controls the on-time of the transistor so that the current value flowing through the light-emitting diode becomes a value corresponding to the detection result of the conduction width detection circuit, and the brightness of the light-emitting diode is increased. The desired brightness is maintained.

特開２００７−３５４０３号公報JP 2007-35403 A

しかしながら、このようなＬＥＤ点灯装置にあっては、発光ダイオードの明るさを暗く設定した場合、位相制御調光器のトライアックがオフするとき、トライアックに並列接続したスナバ回路から電力がトライアックに供給されるため、トライアックがオフすることなく導通することにより、その導通幅が長くなってしまい、この結果、暗く設定した発光ダイオードが明るく点灯したり、点滅したりするなどの問題があった。   However, in such an LED lighting device, when the brightness of the light emitting diode is set to be dark, when the triac of the phase control dimmer is turned off, power is supplied to the triac from the snubber circuit connected in parallel to the triac. Therefore, when the triac is conducted without being turned off, the conduction width becomes longer. As a result, there is a problem that the light-emitting diode set dark is lit brightly or blinks.

この発明の目的は、暗く設定した場合に発光ダイオードが明るくなったり、点滅したりすることのないＬＥＤ点灯装置を提供することにある。   An object of the present invention is to provide an LED lighting device in which a light emitting diode does not brighten or blink when set dark.

請求項１の発明は、交流電圧を位相制御して発光ダイオードの明るさを調光する調光器と、この調光器から出力される出力電圧を平滑する入力平滑回路と、前記発光ダイオードに直流電流を供給する出力平滑回路とを備えた点灯装置であって、
前記入力平滑回路から出力される出力電圧をオン・オフして交流電圧に変換し、この交流電圧を前記出力平滑回路へ出力するインバータ回路と、
前記入力平滑回路の出力電圧に応じた調光信号を生成する調光信号生成回路と、
前記発光ダイオードに流れる電流を検出する出力電流検出回路と、
前記調光信号生成回路の調光信号の信号値と、前記出力電流検出回路の検出電流値とを比較してその差に応じた差電圧を出力する比較回路とを設け、
前記インバータ回路は、前記比較回路の差電圧に応じて、前記出力電圧のオン期間を制御することを特徴とする。 According to the first aspect of the present invention, there is provided a dimmer for dimming the brightness of the light emitting diode by controlling the phase of the AC voltage, an input smoothing circuit for smoothing the output voltage output from the dimmer, and the light emitting diode. A lighting device comprising an output smoothing circuit for supplying a direct current,
An inverter circuit that turns on and off the output voltage output from the input smoothing circuit to convert the output voltage to an AC voltage, and outputs the AC voltage to the output smoothing circuit;
A dimming signal generation circuit for generating a dimming signal according to the output voltage of the input smoothing circuit;
An output current detection circuit for detecting a current flowing in the light emitting diode;
A comparison circuit that compares the signal value of the dimming signal of the dimming signal generation circuit and the detection current value of the output current detection circuit and outputs a difference voltage according to the difference is provided.
The inverter circuit controls an ON period of the output voltage in accordance with a difference voltage of the comparison circuit.

この発明によれば、暗く設定した場合に発光ダイオードが明るくなったり、点滅したりすることがない。   According to the present invention, the light emitting diode does not brighten or blink when set dark.

ＬＥＤ点灯装置の構成を示した回路図である。It is the circuit diagram which showed the structure of the LED lighting device. 調光器のトライアックによって位相制御された電圧波形と、入力平 滑回路によって平滑された電圧を示した説明図である。FIG. 6 is an explanatory diagram showing a voltage waveform phase-controlled by a dimmer of a dimmer and a voltage smoothed by an input smoothing circuit. 第２実施例のＬＥＤ点灯装置の構成を示した回路図である。It is the circuit diagram which showed the structure of the LED lighting device of 2nd Example.

以下、この発明に係るＬＥＤ点灯装置の実施の形態である実施例を図面に基づいて説明する。   Hereinafter, an embodiment which is an embodiment of an LED lighting device according to the present invention will be described with reference to the drawings.

［第１実施例］
図１に示すＬＥＤ点灯装置１０は、交流電圧を位相制御して発光ダイオードの明るさを調光する調光器２０と、入力フィルタ回路３０と、調光器２０で位相制御された脈流電圧（出力電圧）を整流して平滑する入力平滑回路４０と、この入力平滑回路４０から出力される直流電圧を所定の周期でオン・オフして交流電圧に変換するインバータ回路５０と、このインバータ回路５０から出力される交流電圧を半波整流して平滑する出力平滑回路６０と、入力平滑回路４０の直流電圧に応じた調光信号を生成する調光信号生成回路７０と、複数の発光ダイオードＬＥＤを直列接続したＬＥＤモジュールＭに流れる電流を検出する出力電流検出回路８０と、この出力電流検出回路８０が検出する検出電流信号値と調光信号生成回路７０が生成した調光信号値との差に応じた差信号を出力する調光制御回路（比較回路）９０とを備えている。そして、入力フィルタ回路３０と入力平滑回路４０とインバータ回路５０と出力平滑回路６０と調光信号生成回路７０と出力電流検出回路８０と調光制御回路９０等とによって点灯回路１００が構成されている。 [First embodiment]
The LED lighting device 10 shown in FIG. 1 includes a dimmer 20 that dims the brightness of a light-emitting diode by phase-controlling an AC voltage, an input filter circuit 30, and a pulsating current voltage phase-controlled by the dimmer 20 An input smoothing circuit 40 that rectifies and smoothes (output voltage), an inverter circuit 50 that turns on and off a DC voltage output from the input smoothing circuit 40 at a predetermined cycle, and an inverter circuit 50 50, an output smoothing circuit 60 that rectifies and smoothes the AC voltage output from 50, a dimming signal generation circuit 70 that generates a dimming signal according to the DC voltage of the input smoothing circuit 40, and a plurality of light emitting diodes LED Output current detection circuit 80 for detecting the current flowing through the LED module M connected in series, and the detected current signal value detected by the output current detection circuit 80 and the dimming signal generation circuit 70 And a dimming control circuit for outputting a difference signal corresponding to a difference between signal values (comparator circuit) 90. The input filter circuit 30, the input smoothing circuit 40, the inverter circuit 50, the output smoothing circuit 60, the dimming signal generation circuit 70, the output current detection circuit 80, the dimming control circuit 90, and the like constitute the lighting circuit 100. .

調光器２０は、トライアック２１と、外部の調光操作に基づいてトライアック２１をオンさせる位相制御回路２２と、トライアック２１に並列接続されたスナバ回路２３等とを有している。スナバ回路２３は、直列接続した抵抗ＲＳとコンデンサＣＳから構成され、トライアック２１を保護するためのものである。   The dimmer 20 includes a triac 21, a phase control circuit 22 that turns on the triac 21 based on an external dimming operation, a snubber circuit 23 that is connected in parallel to the triac 21, and the like. The snubber circuit 23 is composed of a resistor RS and a capacitor CS connected in series, and is for protecting the triac 21.

入力フィルタ回路３０は、抵抗Ｒ１とコンデンサＣ１とラインフィルタＬ１などとから構成され、調光器２０と点灯回路１００の電源ループで発生する減衰振動を防止し、また雑音の発生を防止するものである。   The input filter circuit 30 includes a resistor R1, a capacitor C1, a line filter L1, and the like. The input filter circuit 30 prevents the damped vibration generated in the power loop of the dimmer 20 and the lighting circuit 100, and also prevents the generation of noise. is there.

入力平滑回路４０は、脈流電圧を全波整流する整流回路４１と、全波整流された脈流電圧を平滑するコンデンサＣ２とを有している。   The input smoothing circuit 40 includes a rectifier circuit 41 that performs full-wave rectification of the pulsating voltage and a capacitor C2 that smoothes the pulsating voltage subjected to full-wave rectification.

インバータ回路５０は、トランスＴと、このトランスＴの一次巻線Ｔ１に直列接続されたトランジスタ５１と、トランジスタ５１を所定周期でオン・オフする駆動回路５２等とを有している。駆動回路５２の入力端子５２ａにはフォトカプラ９２のフォトトランジスタＰＨＴが接続され、駆動回路５２は、入力端子５２ａに流れる電流に応じてトランジスタ５１のオン時間を制御する。   The inverter circuit 50 includes a transformer T, a transistor 51 connected in series to the primary winding T1 of the transformer T, a drive circuit 52 that turns the transistor 51 on and off at a predetermined period, and the like. The phototransistor PHT of the photocoupler 92 is connected to the input terminal 52a of the drive circuit 52, and the drive circuit 52 controls the on-time of the transistor 51 in accordance with the current flowing through the input terminal 52a.

出力平滑回路６０は、インバータ回路５０のトランスＴの二次巻線Ｔ２から出力される交流電圧を半波整流するダイオード６１と、このダイオード６１で半波整流された電圧を平滑するコンデンサＣ３とを有している。   The output smoothing circuit 60 includes a diode 61 for half-wave rectifying the AC voltage output from the secondary winding T2 of the transformer T of the inverter circuit 50, and a capacitor C3 for smoothing the voltage half-wave rectified by the diode 61. Have.

調光信号生成回路７０は、トランスＴの二次巻線Ｔ２の両端子間に接続された直列回路のダイオード７１およびコンデンサＣ４と、オペアンプ７２等とを有している。オペアンプ７２の反転入力端子は抵抗を介してダイオード７１とコンデンサＣ４の接続点に接続され、オペアンプ７２の非反転入力端子はマイナスラインＧに接続されている。   The dimming signal generation circuit 70 includes a series circuit diode 71 and a capacitor C4 connected between both terminals of the secondary winding T2 of the transformer T, an operational amplifier 72, and the like. The inverting input terminal of the operational amplifier 72 is connected to the connection point between the diode 71 and the capacitor C4 via a resistor, and the non-inverting input terminal of the operational amplifier 72 is connected to the minus line G.

そして、ダイオード７１とコンデンサＣ４によって、二次巻線Ｔ２に生じる電圧に応じた直流の負電圧の調光信号が得られる。この負の調光信号はオペアンプ７２により反転され、正の調光信号となってオペアンプ７２から出力される。   Then, a dimming signal with a negative DC voltage corresponding to the voltage generated in the secondary winding T2 is obtained by the diode 71 and the capacitor C4. This negative dimming signal is inverted by the operational amplifier 72 and is output from the operational amplifier 72 as a positive dimming signal.

この正の調光信号電圧は、トランスＴの二次巻線Ｔ２の電圧が一次巻線Ｔ１の電圧に比例していることにより、入力平滑回路４０の直流電圧に比例する。すなわち、正の調光信号電圧は調光器２０から出力される脈流電圧に比例している。   This positive dimming signal voltage is proportional to the DC voltage of the input smoothing circuit 40 because the voltage of the secondary winding T2 of the transformer T is proportional to the voltage of the primary winding T1. That is, the positive dimming signal voltage is proportional to the pulsating voltage output from the dimmer 20.

出力電流検出回路８０は、ＬＥＤモジュールＭに直列接続された抵抗Ｒ２と、この抵抗Ｒ２に並列接続されたコンデンサＣ５とを有している。   The output current detection circuit 80 includes a resistor R2 connected in series to the LED module M and a capacitor C5 connected in parallel to the resistor R2.

調光制御回路９０は、オペアンプ９１と、フォトカプラ９２の発光ダイオード９２Ｄなどとを有している。オペアンプ９１の出力端子にはフォトカプラ９２の発光ダイオード９２Ｄのアノードが抵抗を介して接続されている。発光ダイオード９２ＤのカソードはマイナスラインＧに接続されている。   The dimming control circuit 90 includes an operational amplifier 91, a light emitting diode 92D of a photocoupler 92, and the like. The anode of the light emitting diode 92D of the photocoupler 92 is connected to the output terminal of the operational amplifier 91 via a resistor. The cathode of the light emitting diode 92D is connected to the minus line G.

オペアンプ９１の非反転入力端子には、出力電流検出回路８０の抵抗Ｒ２に生じる電圧が抵抗を介して入力し、オペアンプ９１の反転入力端子には、調光信号生成回路７０のオペアンプ７２から出力される調光信号が入力するようになっている。   The voltage generated in the resistor R2 of the output current detection circuit 80 is input to the non-inverting input terminal of the operational amplifier 91 via the resistor, and is output from the operational amplifier 72 of the dimming signal generation circuit 70 to the inverting input terminal of the operational amplifier 91. A dimming signal is input.

そして、オペアンプ９１は、抵抗Ｒ２に生じる電圧と調光信号の電圧との差に応じた差電圧を出力する。この差電圧に応じてフォトカプラ９２の発光ダイオード９２Ｄに電流が流れる。
［動 作］
次に、上記のように構成されるＬＥＤ点灯装置の動作について説明する。 The operational amplifier 91 outputs a difference voltage corresponding to the difference between the voltage generated in the resistor R2 and the voltage of the dimming signal. A current flows through the light emitting diode 92D of the photocoupler 92 according to the difference voltage.
[Operation]
Next, the operation of the LED lighting device configured as described above will be described.

外部の調光操作により位相制御回路２２がトライアック２１を位相制御すると、トライアック２１から例えば図２（Ａ）や図２（Ｂ）に示す位相制御された脈流電圧が出力される。なお、図２（Ａ）は明るさを大きく設定した場合、図２（Ｂ）は明るさを小さく設定した場合の脈流電圧を示す。   When the phase control circuit 22 controls the phase of the triac 21 by an external dimming operation, for example, the phase-controlled pulsating voltage shown in FIGS. 2A and 2B is output from the triac 21. 2A shows the pulsating voltage when the brightness is set large, and FIG. 2B shows the pulsating voltage when the brightness is set small.

この脈流電圧は、入力フィルタ回路３０を介して入力平滑回路４０へ入力し、この入力平滑回路４０によって整流されて平滑され、例えば図２（Ｃ）や図２（Ｄ）に示す直流電圧となる。図２（Ｃ）に示す直流電圧は図２（Ａ）の脈流電圧が整流されて平滑された場合を示し、図２（Ｄ）に示す直流電圧は図２（Ｂ）の脈流電圧が整流されて平滑された場合を示す。すなわち、調光操作により明るく設定された場合には入力平滑回路４０から出力される直流電圧は高くなり、暗く設定された場合には入力平滑回路４０から出力される直流電圧は低くなる。   This pulsating voltage is input to the input smoothing circuit 40 via the input filter circuit 30, and is rectified and smoothed by the input smoothing circuit 40. For example, the DC voltage shown in FIG. 2C or FIG. Become. The DC voltage shown in FIG. 2 (C) shows a case where the pulsating voltage of FIG. 2 (A) is rectified and smoothed, and the DC voltage shown in FIG. 2 (D) is the pulsating voltage of FIG. 2 (B). The case where it is rectified and smoothed is shown. That is, the DC voltage output from the input smoothing circuit 40 increases when the brightness is set bright by the dimming operation, and the DC voltage output from the input smoothing circuit 40 decreases when the brightness is set dark.

この直流電圧は、インバータ回路５０のトランスＴの一次巻線Ｔ１に印加する。   This DC voltage is applied to the primary winding T1 of the transformer T of the inverter circuit 50.

インバータ回路５０は、所定周期でトランジスタ５１をオン・オフさせる。このオン・オフにより、トランスＴの一次巻線Ｔ１に印加する直流電圧は断続され、この断続によりトランスＴの二次巻線Ｔ２に交流電圧が誘起される。この二次巻線Ｔ２の交流電圧は、トランスＴの一次巻線Ｔ１に印加する電圧に比例する。つまり、調光操作により明るく設定されている場合には二次巻線Ｔ２の交流電圧は高く、暗く設定されている場合には二次巻線Ｔ２の交流電圧は低くなる。   The inverter circuit 50 turns the transistor 51 on and off at a predetermined cycle. By this on / off operation, the DC voltage applied to the primary winding T1 of the transformer T is interrupted, and an AC voltage is induced in the secondary winding T2 of the transformer T by this interruption. The AC voltage of the secondary winding T2 is proportional to the voltage applied to the primary winding T1 of the transformer T. That is, the AC voltage of the secondary winding T2 is high when it is set bright by the dimming operation, and the AC voltage of the secondary winding T2 is low when it is set dark.

この交流電圧は、出力平滑回路６０により半波整流されて平滑され、直流電圧となってＬＥＤモジュールＭに印加し、ＬＥＤモジュールＭの各発光ダイオードＬＥＤに電流が流れて各発光ダイオードＬＥＤが発光する。   This AC voltage is half-wave rectified and smoothed by the output smoothing circuit 60, applied to the LED module M as a DC voltage, and a current flows through each light emitting diode LED of the LED module M, so that each light emitting diode LED emits light. .

一方、調光信号生成回路７０は、入力平滑回路４０から出力される直流電圧に応じた調光信号を生成する。他方、出力電流検出回路８０がＬＥＤモジュールＭに流れる電流を検出する。   On the other hand, the dimming signal generation circuit 70 generates a dimming signal corresponding to the DC voltage output from the input smoothing circuit 40. On the other hand, the output current detection circuit 80 detects the current flowing through the LED module M.

調光制御回路９０のオペアンプ９１は、調光信号生成回路７０の調光信号電圧と、出力電流検出回路８０が検出する電流に応じた電圧とを比較し、その差に応じた差電圧を出力する。そして、フォトカプラ９２の発光ダイオード９２Ｄにその差電圧に応じた電流が流れて発光し、フォトカプラ９２のフォトトランジスＰＨＴがその光を受光し、その受光量に応じた電流がフォトトランジスＰＨＴに流れる。   The operational amplifier 91 of the dimming control circuit 90 compares the dimming signal voltage of the dimming signal generation circuit 70 with the voltage corresponding to the current detected by the output current detection circuit 80, and outputs the difference voltage according to the difference. To do. Then, a current corresponding to the differential voltage flows through the light emitting diode 92D of the photocoupler 92 to emit light, the phototransistor PHT of the photocoupler 92 receives the light, and a current according to the amount of received light flows to the phototransistor PHT. .

インバータ回路５０の駆動回路５２は、フォトトランジスＰＨＴに流れる電流に基づいて、トランジスタ５１のオン時間を制御する。例えば、調光信号電圧に対して出力電流検出回路８０の検出電流が小さい場合、すなわち、調光信号に対して発光ダイオードＬＥＤの発光が暗い場合、トランジスタ５１がオンしている期間を長くして、トランスＴの二次巻線Ｔ２に生じる電圧を上げて発光ダイオードＬＥＤに流れる電流を増加させ、発光ダイオードＬＥＤの明るさを所定の明るさにする。   The drive circuit 52 of the inverter circuit 50 controls the on-time of the transistor 51 based on the current flowing through the phototransistor PHT. For example, when the detection current of the output current detection circuit 80 is small with respect to the dimming signal voltage, that is, when the light emission of the light emitting diode LED is dark with respect to the dimming signal, the period during which the transistor 51 is on is lengthened. The voltage generated in the secondary winding T2 of the transformer T is increased to increase the current flowing through the light emitting diode LED, thereby making the light emitting diode LED have a predetermined brightness.

逆に、調光信号電圧に対して出力電流検出回路８０の検出電流が大きい場合、すなわち、調光信号に対して発光ダイオードＬＥＤの発光が明るすぎる場合、トランジスタ５１がオンしている期間を短くして、トランスＴの二次巻線Ｔ２に生じる電圧を下げて発光ダイオードＬＥＤに流れる電流を減少させ、発光ダイオードＬＥＤの明るさを所定の明るさにする。   On the contrary, when the detection current of the output current detection circuit 80 is large with respect to the dimming signal voltage, that is, when the light emission of the light emitting diode LED is too bright with respect to the dimming signal, the period during which the transistor 51 is on is shortened. Then, the voltage generated in the secondary winding T2 of the transformer T is lowered to reduce the current flowing through the light emitting diode LED, and the brightness of the light emitting diode LED is set to a predetermined brightness.

このように、調光信号生成回路７０の調光信号に基づいて発光ダイオードＬＥＤの明るさが所定の明るさとなるようにトランジスタ５１のオンする期間が制御される。   In this manner, the period during which the transistor 51 is turned on is controlled based on the dimming signal from the dimming signal generation circuit 70 so that the brightness of the light emitting diode LED becomes a predetermined brightness.

外部の調光操作により明るさを暗く設定すると、図２（Ｂ）に示す脈流電流が調光器２０から出力され、入力平滑回路４０から図２（Ｄ）に示す直流電圧が出力され、この直流電圧が低いため、発光ダイオードＬＥＤの発光は暗いものとなる。   When the brightness is set to be dark by an external dimming operation, the pulsating current shown in FIG. 2 (B) is output from the dimmer 20, and the DC voltage shown in FIG. 2 (D) is output from the input smoothing circuit 40. Since this DC voltage is low, the light emission of the light emitting diode LED is dark.

この場合、トライアック２１がオフする際、スナバ回路２３のコンデンサＣＳからトライアック２１に電力が供給されるので、トライアック２１の導通幅が長くなり、発光ダイオードＬＥＤは明るく点灯してしまうことになる。   In this case, when the triac 21 is turned off, electric power is supplied from the capacitor CS of the snubber circuit 23 to the triac 21, so that the conduction width of the triac 21 is increased and the light emitting diode LED is lit brightly.

しかし、トライアック２１がオフする前後では、調光器２０から出力される電圧レベルの変化は少ない状態であり、調光信号生成回路７０で生成される調光信号の電圧は変化しない。このため、発光ダイオードＬＥＤの電流が増加して発光ダイオードＬＥＤが明るく点灯すると、出力電流検出回路８０の検出電流が大きくなり、調光信号の電圧が変化しないことにより調光制御回路９０のオペアンプ９１が出力する差電圧が大きくなる。この結果、インバータ回路５０はトランジスタ５１をオンする期間を短くし、このため、発光ダイオードＬＥＤが明るく点灯してしまうことが防止され、発光ダイオードＬＥＤは所定の暗さで点灯することになる。   However, there is little change in the voltage level output from the dimmer 20 before and after the triac 21 is turned off, and the voltage of the dimming signal generated by the dimming signal generation circuit 70 does not change. For this reason, when the current of the light emitting diode LED increases and the light emitting diode LED is lit brightly, the detection current of the output current detection circuit 80 increases, and the voltage of the dimming signal does not change, so that the operational amplifier 91 of the dimming control circuit 90 The differential voltage output from becomes larger. As a result, the inverter circuit 50 shortens the period during which the transistor 51 is turned on. For this reason, the light emitting diode LED is prevented from being lit brightly, and the light emitting diode LED is lit in a predetermined darkness.

すなわち、明るさを暗く設定した場合に発光ダイオードＬＥＤが明るくなったり、調光器２０を消灯操作した際に発光ダイオードＬＥＤが点滅したりしてしまうことがない。
［第２実施例］
図３は、第２実施例のＬＥＤ点灯装置２００の構成を示す回路図である。このＬＥＤ点灯装置２００の点灯回路１２０は、第１実施例の調光信号生成回路７０の替わりに調光信号生成回路１７０を備えている。 That is, the light emitting diode LED does not become bright when the brightness is set to be dark, and the light emitting diode LED does not blink when the dimmer 20 is turned off.
[Second Embodiment]
FIG. 3 is a circuit diagram showing the configuration of the LED lighting device 200 of the second embodiment. The lighting circuit 120 of the LED lighting device 200 includes a dimming signal generation circuit 170 instead of the dimming signal generation circuit 70 of the first embodiment.

調光信号生成回路１７０は、トランスＴの二次巻線Ｔ２に生じる交流電圧を半波整流するダイオードＤ１と、このダイオードＤ１から出力される整流電圧を平滑するコンデンサＣ１０および抵抗Ｒ１０からなる平滑回路１７１と、この平滑回路１７１で平滑された電圧を分圧する分圧抵抗Ｒ１１,Ｒ１２からなる分圧回路１７２とを備えている。   The dimming signal generation circuit 170 is a smoothing circuit including a diode D1 that half-wave rectifies an AC voltage generated in the secondary winding T2 of the transformer T, a capacitor C10 that smoothes the rectified voltage output from the diode D1, and a resistor R10. 171 and a voltage dividing circuit 172 including voltage dividing resistors R11 and R12 that divide the voltage smoothed by the smoothing circuit 171.

この調光信号生成回路１７０は、入力平滑回路４０の直流電圧に比例した正電圧を得ることで調光信号を生成するようにしたものである。他は、第１実施例と同様なのでその説明は省略する。   The dimming signal generation circuit 170 is configured to generate a dimming signal by obtaining a positive voltage proportional to the DC voltage of the input smoothing circuit 40. Others are the same as in the first embodiment, and a description thereof will be omitted.

上記実施例は、いずれもトランスＴの二次コイルＴ２に発生する電圧から調光信号を生成するようにしているが、必ずしもこれに限らず例えば入力平滑回路４０の出力電圧から調光信号を生成するようにしてもよい。   In any of the above embodiments, the dimming signal is generated from the voltage generated in the secondary coil T2 of the transformer T. However, the present invention is not limited to this. For example, the dimming signal is generated from the output voltage of the input smoothing circuit 40. You may make it do.

この発明は、第１,第２実施例に限られるものではなく、特許請求の範囲の各請求項に係る発明の要旨を逸脱しない限り、設計の変更や追加等は許容される。   The present invention is not limited to the first and second embodiments, and design changes and additions are permitted without departing from the spirit of the invention according to each claim of the claims.

２０ 調光器
４０ 入力平滑回路
５０ インバータ回路
６０ 出力平滑回路
７０ 調光信号生成回路
８０ 出力電流検出回路
９０ 調光制御回路（比較回路）
ＬＥＤ 発光ダイオード 20 dimmer 40 input smoothing circuit 50 inverter circuit 60 output smoothing circuit 70 dimming signal generation circuit 80 output current detection circuit 90 dimming control circuit (comparison circuit)
LED light emitting diode

Claims (1)

交流電圧を位相制御して発光ダイオードの明るさを調光する調光器と、この調光器から出力される出力電圧を平滑する入力平滑回路と、前記発光ダイオードに直流電流を供給する出力平滑回路とを備えた点灯装置であって、
前記入力平滑回路から出力される出力電圧をオン・オフして交流電圧に変換し、この交流電圧を前記出力平滑回路へ出力するインバータ回路と、
前記入力平滑回路の出力電圧に応じた調光信号を生成する調光信号生成回路と、
前記発光ダイオードに流れる電流を検出する出力電流検出回路と、
前記調光信号生成回路の調光信号の信号値と、前記出力電流検出回路の検出電流値とを比較してその差に応じた差電圧を出力する比較回路とを設け、
前記インバータ回路は、前記比較回路の差電圧に応じて、前記出力電圧のオン期間を制御することを特徴とする点灯装置。 A dimmer for dimming the brightness of the light emitting diode by controlling the phase of the alternating voltage, an input smoothing circuit for smoothing the output voltage output from the dimmer, and an output smoothing for supplying a direct current to the light emitting diode A lighting device comprising a circuit,
An inverter circuit that turns on and off the output voltage output from the input smoothing circuit to convert the output voltage to an AC voltage, and outputs the AC voltage to the output smoothing circuit;
A dimming signal generation circuit for generating a dimming signal according to the output voltage of the input smoothing circuit;
An output current detection circuit for detecting a current flowing in the light emitting diode;
A comparison circuit that compares the signal value of the dimming signal of the dimming signal generation circuit and the detection current value of the output current detection circuit and outputs a difference voltage according to the difference is provided.
The lighting device according to claim 1, wherein the inverter circuit controls an ON period of the output voltage in accordance with a difference voltage of the comparison circuit.
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JP2011238439A (en) * 2010-05-10 2011-11-24 Sanken Electric Co Ltd Led lighting device
JP2011249031A (en) * 2010-05-24 2011-12-08 Sanken Electric Co Ltd Led lighting device
JP2013097897A (en) * 2011-10-28 2013-05-20 Shihen Tech Corp Led lighting device
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011238439A (en) * 2010-05-10 2011-11-24 Sanken Electric Co Ltd Led lighting device
JP2011249031A (en) * 2010-05-24 2011-12-08 Sanken Electric Co Ltd Led lighting device
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JP2014524642A (en) * 2011-08-01 2014-09-22 コーニンクレッカ フィリップス エヌ ヴェ Driver device and driving method for driving load, especially LED unit
JP2013097897A (en) * 2011-10-28 2013-05-20 Shihen Tech Corp Led lighting device
GB2507982A (en) * 2012-11-15 2014-05-21 Tridonic Gmbh & Co Kg Converter module and method for dimming at least one LED
JP2016522563A (en) * 2013-06-27 2016-07-28 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． A bleeder circuit for a non-linear light load dimmer.

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