WO2012039070A1 - Non-blinking light-emission maintaining method for led dimmer, and non-blinking light-emission maintaining apparatus for led dimmer - Google Patents
Non-blinking light-emission maintaining method for led dimmer, and non-blinking light-emission maintaining apparatus for led dimmer Download PDFInfo
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- the present invention relates to an LED dimmer non-flashing method and an LED dimmer non-flashing device.
- Japanese Unexamined Patent Application Publication No. 2010-212267 discloses an LED drive circuit that can reduce LED flickering and blinking that may occur when used with a phase control dimmer.
- This LED drive circuit is an LED drive circuit (LED drive circuit 4) that inputs an alternating voltage to drive an LED (LED module 3), and is supplied with current from a current supply line for supplying LED drive current to the LED.
- Current extraction unit bypass circuit 7
- timing adjustment unit timing adjustment circuit
- the problem to be solved by the present invention is to provide an LED driving circuit capable of reducing flickering and blinking of LEDs. It is an object of the present invention to enable LED dimming by maintaining a triac current by dynamic operation.
- the LED dimmer non-flashing emission maintaining method detects the threshold voltage at which the LED can emit light by the threshold level detector in the first stage, Based on the light-emitable voltage threshold detected in the first step in the second step, the logic level converter converts the current to be supplied to the LED into a voltage at which the LED can start light emission, and starts light emission.
- the dynamic supply load device converts the current to be supplied to the LED into a voltage that can maintain the light emission of the LED without flickering. It is characterized by maintaining the light emission without blinking.
- the non-flashing light emission maintaining device for an LED dimmer includes a threshold level detector that detects a voltage threshold value at which the LED can emit light, and an LED that emits a current to be supplied to the LED based on the light-emitting voltage threshold value. Based on the logic level converter that converts the voltage into a starting voltage and the light-emitting threshold voltage, the current to be supplied to the LED is converted into a voltage that can maintain the light emission without flickering the LED, and no light is emitted. And a dynamic supply load device that maintains blinking.
- the inventive device is composed of three stages: a threshold level detector, a logic level converter, and a dynamic supply load device. This design can automatically supply the holding current necessary for the TRIAC to remain stable under sufficient load to remain on. This design allows for automatic cut-off of the load, taking into account power consumption, with very low power loss while the triac is triggered.
- An effect of the present invention is to provide an LED driving circuit that can reduce flickering and blinking of LEDs.
- the brightness of the LED can be dimmed in a continuous manner without flashing.
- FIG. 1 shows a dimming transformer circuit. A voltage stabilization circuit is shown. Waveforms VF2, VP3, and VF4 corresponding to FIG. 1 are shown (horizontal axis: current, vertical axis: voltage). The block diagram of the module which comprises the light modulation apparatus which concerns on this invention is shown.
- FIG. 1 shows how the first stage (stage 1) operates as a threshold level detector in series with a resistor Rl and a Zener diode Dl as a voltage clamp, the threshold value being selectable by the value of the Zener diode Dl. ing.
- the function of the resistor Rl is used as a current limit for limiting the current value to a certain width and preventing the overcurrent to protect the Zener diode.
- FIG. 1 shows a second stage (stage 2) as a logic level converter, which includes resistors R2, R3, R4 and a transistor Tl.
- the function of the resistors R2 and R3 connected in series is detection for obtaining the cut-in voltage of the transistor Tl.
- the logic output Low is output at a low voltage level.
- the resistor R4 is a load of the transistor Tl and can be selected in consideration of low power consumption.
- FIG. 1 shows a third stage (stage 3) as a dynamic supply load device, which includes resistors R5, R6, R7, R8, and MOSFET T2.
- R5, R6, and R7 are applied with a voltage suitable for turning on / off MOSFET T2.
- the desired holding current of the external dimming triac is calculated by the voltage V rect across resistor R8.
- FIG. 2 is similar to FIG. 1, but here, an independent photocoupler Tl having a function of transmitting the brightness of the LED is used as a logic level converter.
- the function of the resistor Rl (stage 1) is used as a current limit for limiting the current value to a certain width and avoiding overcurrent to protect the Zener diodes Dl and D2.
- FIG. 2 shows a second stage (stage 2) as a logic level converter, which includes resistors R2, R6, R7 and a photocoupler Tl.
- the function of the circuit voltage (within Tl) of R2 and the LED connected in series is to detect the signal from the Zener diode Dl to obtain a clamping voltage for turning on the LED.
- Tl When Tl is turned on and becomes saturated, it becomes a low voltage level output as a logic output Low.
- Resistor R6 is a load of transistor Tl and can be selected in consideration of low power consumption.
- FIG. 2 shows the third stage (stage 3) as a dynamic supply load device, which includes R8 and MOSFET connected in series. T2 is included.
- the MOSFET T2 When the driving voltage of the resistor R2 and the LED in Tl becomes High, the MOSFET T2 is short-circuited to constitute a ground circuit directly connected to the resistor R8.
- the desired holding current of the external dimming triac is calculated by the voltage V rect across resistor R8.
- FIG. 2 has a photocoupler Tl as an independent circuit, which is suitable for a noisy operating environment and corresponds to higher noise resistance.
- the Zeners Dl and D2 play an important role of clamping to a constant value in order to insert the supply resistor R8 when the V rect signal is lower than a predetermined value.
- the resistor R8 is always in a state of being dynamically inserted.
- FIG. 3 shows waveforms VF2, VP3, and VF4 corresponding to FIG.
- Waveform VP4 is a signal that is full-wave rectified by bridge diodes (Dll, D12, D13, and D14) and may have a peak voltage of several hundred volts.
- Waveform VF2 is kept in the ON state, and VF2 becomes a signal for tracking VF4 by transmitting negative logic to VF4 except when VF4 is lower than a predetermined threshold value.
- Waveform VF3 shows how the TRIAC dimmer operates at a desired holding current during the logic level Low when T2 in FIG. 1 is in the ON state.
- FIG. 4 shows a schematic diagram of an LED non-flashing circuit according to the first embodiment of the present invention.
- the LED non-flashing circuit includes a power source, a triac, a rectifier, an LED driver, an automatic load supply circuit, and an LED array.
- a power supply is provided to supply power.
- the triac has a variable resistor for changing the current of the power source.
- a rectifier is provided to convert the negative part of the sine wave to the positive part of the sine wave.
- LED driver is provided to drive the LED array.
- the LED driver can supply a constant current to the LED array. Accordingly, the LED array is lit in a state that is not so bright by the automatic load supply circuit.
- the automatic load supply circuit referred to here can be implemented according to FIGS. 1 and 2 described above.
- the switch When the switch is switched to the first state, the LED non-flashing circuit is activated and the LED array lights up very brightly.
- the switch When the switch is switched to the second state, the automatic load supply device stops operating.
- the brightness of the LED can be adjusted in a continuous manner without blinking.
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Abstract
Description
本願発明は、ＬＥＤ調光器の無点滅方法、及び、ＬＥＤ調光器用無点滅装置に関する。 The present invention relates to an LED dimmer non-flashing method and an LED dimmer non-flashing device.
［特開２０１０－２１２２６７号公報］
特開２０１０－２１２２６７号公報には、位相制御式調光器とともに用いられたときに発生し得るＬＥＤのちらつきや点滅を低減することができるＬＥＤ駆動回路が開示されている。
このＬＥＤ駆動回路は、交番電圧を入力してＬＥＤ（ＬＥＤモジュール３）を駆動するＬＥＤ駆動回路（ＬＥＤ駆動回路４）であって、ＬＥＤ駆動電流を前記ＬＥＤに供給するための電流供給ラインから電流を引き抜く電流引き抜き部（バイパス回路７）と、前記電流引き抜き部での電流引き抜き開始タイミングと電流引き抜き持続時間を調整するタイミング調整部（タイミング調整回路６）とを備える。
[Japanese Patent Laid-Open No. 2010-212267]
Japanese Unexamined Patent Application Publication No. 2010-212267 discloses an LED drive circuit that can reduce LED flickering and blinking that may occur when used with a phase control dimmer.
This LED drive circuit is an LED drive circuit (LED drive circuit 4) that inputs an alternating voltage to drive an LED (LED module 3), and is supplied with current from a current supply line for supplying LED drive current to the LED. Current extraction unit (bypass circuit 7), and a timing adjustment unit (timing adjustment circuit 6) for adjusting the current extraction start timing and current extraction duration in the current extraction unit.
本発明が解決しようとする課題は、ＬＥＤのちらつきや点滅を低減することができるＬＥＤ駆動回路を提供することである。
動的操作によりトライアックの電流を保持することで、ＬＥＤの調光を可能にすることを課題とする。
The problem to be solved by the present invention is to provide an LED driving circuit capable of reducing flickering and blinking of LEDs.
It is an object of the present invention to enable LED dimming by maintaining a triac current by dynamic operation.
本発明に関するＬＥＤ調光器の無点滅発光維持方法は第１段階において閥値レベル検出器によりＬＥＤが発光可能電圧閾値を検出し、
第２段階において第１段階で検出した発光可能電圧閾値に基づき、論理レベル変換器により、ＬＥＤに供給すべき電流を、ＬＥＤが発光起動可能な電圧に変換して、発光起動をし、
第３段階において第１段階で検出した発光可能電圧閾値に基づき、動的供給負荷装置により、ＬＥＤに供給すべき電流を、ＬＥＤの発光をちらつきなく発光維持することが可能な電圧に変換して、発光無点滅維持をすることを特徴とする。
本発明に係るＬＥＤ調光器用無点滅発光維持装置は、ＬＥＤが発光可能な電圧閾値を検出する閾値レベル検出器と、前記発光可能電圧閾値に基づき、ＬＥＤに供給すべき電流を、ＬＥＤが発光起動な電圧に変換する論理レベル変換器と、前記発光可能電圧閾値に基づき、ＬＥＤに供給すべき電流を、ＬＥＤの発光をちらつくことなく発光を維持することが可能な電圧に変換して発光無点滅維持をする動的供給負荷装置と、を有することを特徴とする。
発明装置は、閥値レベル検出器、論理レベル変換器、および動的供給負荷装置の３段階から構成される。
この設計は、オン状態を保つために、十分な負荷のもとでトライアックが安定状態を保つために必要な保持電流を自動的に供給可能である。
この設計は、電力消費を考慮して、トライアックがトリガされている間の電力損失が極めて低い、負荷の自動カットオフを可能にする。
The LED dimmer non-flashing emission maintaining method according to the present invention detects the threshold voltage at which the LED can emit light by the threshold level detector in the first stage,
Based on the light-emitable voltage threshold detected in the first step in the second step, the logic level converter converts the current to be supplied to the LED into a voltage at which the LED can start light emission, and starts light emission.
In the third stage, based on the light emission possible voltage threshold detected in the first stage, the dynamic supply load device converts the current to be supplied to the LED into a voltage that can maintain the light emission of the LED without flickering. It is characterized by maintaining the light emission without blinking.
The non-flashing light emission maintaining device for an LED dimmer according to the present invention includes a threshold level detector that detects a voltage threshold value at which the LED can emit light, and an LED that emits a current to be supplied to the LED based on the light-emitting voltage threshold value. Based on the logic level converter that converts the voltage into a starting voltage and the light-emitting threshold voltage, the current to be supplied to the LED is converted into a voltage that can maintain the light emission without flickering the LED, and no light is emitted. And a dynamic supply load device that maintains blinking.
The inventive device is composed of three stages: a threshold level detector, a logic level converter, and a dynamic supply load device.
This design can automatically supply the holding current necessary for the TRIAC to remain stable under sufficient load to remain on.
This design allows for automatic cut-off of the load, taking into account power consumption, with very low power loss while the triac is triggered.
本発明の効果は、ＬＥＤのちらつきや点滅を低減することができるＬＥＤ駆動回路を提供することができることである。
ＬＥＤの輝度は、点滅のない連続的な方法で調光可能である。
An effect of the present invention is to provide an LED driving circuit that can reduce flickering and blinking of LEDs.
The brightness of the LED can be dimmed in a continuous manner without flashing.
図１は、第１段階（ステージ１）が、抵抗器Ｒｌおよび電圧クランプとしてのツェナーダイオードＤｌと直列に、閥値をツェナーダイオードＤｌの値によって選択できる閥値レベル検出器として作動する方法を示している。
抵抗器Ｒｌの機能は、電流値を一定の幅に制限し、過電流を避けてツェナーダイオードを保護するための電流制限として使用されている。
FIG. 1 shows how the first stage (stage 1) operates as a threshold level detector in series with a resistor Rl and a Zener diode Dl as a voltage clamp, the threshold value being selectable by the value of the Zener diode Dl. ing.
The function of the resistor Rl is used as a current limit for limiting the current value to a certain width and preventing the overcurrent to protect the Zener diode.
ツェナーダイオードＤｌの特性により、入力であるＶrectが閥値電圧を超えて増加しようとした際に、電圧を一定の値にクランプすることができる。 Due to the characteristics of the Zener diode Dl, when the input V rect is going to increase beyond the threshold voltage, the voltage can be clamped to a constant value.
図１に、論理レベル変換器としての第２段階（ステージ２）が示されており、これには抵抗器Ｒ２、Ｒ３、Ｒ４、およびトランジスタＴｌが含まれる。 FIG. 1 shows a second stage (stage 2) as a logic level converter, which includes resistors R2, R3, R4 and a transistor Tl.
直列に接続された抵抗器Ｒ２およびＲ３の機能は、トランジスタＴｌのカットイン電圧を得るための検知である。 The function of the resistors R2 and R3 connected in series is detection for obtaining the cut-in voltage of the transistor Tl.
トランジスタＴｌがオンになり、飽和状態になると、論理出力Ｌｏｗとして低電圧レベル出力になる。 When the transistor Tl is turned on and saturated, the logic output Low is output at a low voltage level.
抵抗器Ｒ３において低電圧側聞値電圧が検知されると、トランジスタのカットオフが発生し、論理回路の出力はＨｉｇｈになる。 When the low voltage side threshold voltage is detected in the resistor R3, the transistor is cut off and the output of the logic circuit becomes High.
抵抗器Ｒ４は、トランジスタＴｌの負荷であり、低電力消費を考慮して選択することが可能である。 The resistor R4 is a load of the transistor Tl and can be selected in consideration of low power consumption.
図１に、動的供給負荷装置としての第３段階（ステージ３）が示されており、これには抵抗器Ｒ５、Ｒ６、Ｒ７、Ｒ８、およびMOSFET T2が含まれる。 FIG. 1 shows a third stage (stage 3) as a dynamic supply load device, which includes resistors R5, R6, R7, R8, and MOSFET T2.
Ｒ５、Ｒ６、およびＲ７には、MOSFET T2のオン／オフに適した電圧がかけられる。 R5, R6, and R7 are applied with a voltage suitable for turning on / off MOSFET T2.
抵抗器Ｒ５の駆動電圧がＨｉｇｈになると、MOSFET T2が短絡され、抵抗器Ｒ８に直接つながる接地回路を構成する。 When the driving voltage of the resistor R5 becomes High, the MOSFET T2 is short-circuited to constitute a ground circuit directly connected to the resistor R8.
外部の調光用トライアックの希望保持電流は、抵抗器Ｒ８にかかる電圧Ｖrectによって計算される。 The desired holding current of the external dimming triac is calculated by the voltage V rect across resistor R8.
図２は、図１と類似しているが、ここでは論理レベル変換器として、ＬＥＤの輝度を伝える機能を持つ独立のフォトカプラＴｌが使用されている。 FIG. 2 is similar to FIG. 1, but here, an independent photocoupler Tl having a function of transmitting the brightness of the LED is used as a logic level converter.
図２では、抵抗器Ｒｌの機能（ステージ１）は、電流値を一定の幅に制限し、過電流を避けてツェナーダイオードＤｌおよびＤ２を保護するための電流制限として使用されている。 In FIG. 2, the function of the resistor Rl (stage 1) is used as a current limit for limiting the current value to a certain width and avoiding overcurrent to protect the Zener diodes Dl and D2.
ツェナーダイオードＤｌおよびＤ２の特性により、入力であるＶrectが閥値電圧を超えて増加しようとした際に、電圧を２つの異なる一定の値にクランプすることができる。 Due to the characteristics of the Zener diodes Dl and D2, when the input V rect is going to increase beyond the threshold voltage, the voltage can be clamped to two different constant values.
図２には、論理レベル変換器としての第２段階（ステージ２）が示されており、これには抵抗器Ｒ２、Ｒ６、Ｒ７、およびフォトカプラＴｌが含まれる。 FIG. 2 shows a second stage (stage 2) as a logic level converter, which includes resistors R2, R6, R7 and a photocoupler Tl.
直列に接続されたＲ２およびＬＥＤの（Ｔｌ内における）回路電圧の機能は、ＬＥＤをオンにするためのクランプ電圧を得るために、ツェナーダイオードＤｌからの信号を検知することである。 The function of the circuit voltage (within Tl) of R2 and the LED connected in series is to detect the signal from the Zener diode Dl to obtain a clamping voltage for turning on the LED.
Ｔｌがオンになり、飽和状態になると、論理出力Ｌｏｗとして低電圧レベル出力になる。 When Tl is turned on and becomes saturated, it becomes a low voltage level output as a logic output Low.
ツェナーＤｌにおいて低電圧側聞値電圧が検知されると、Ｔｌのカットオフが発生し、論理回路の出力はＨｉｇｈになる。 When the low voltage side threshold voltage is detected in the Zener Dl, a cutoff of Tl occurs, and the output of the logic circuit becomes High.
抵抗器Ｒ６は、トランジスタＴｌの負荷であり、低電力消費を考慮して選択することが可能である。 Resistor R6 is a load of transistor Tl and can be selected in consideration of low power consumption.
図２に、動的供給負荷装置としての第３段階（ステージ３）が示されており、これには直列に接続されたＲ８およびMOSFET
T2が含まれる。
FIG. 2 shows the third stage (stage 3) as a dynamic supply load device, which includes R8 and MOSFET connected in series.
T2 is included.
ツェナーＤｌ上の信号が伝えられ、MOSFET T2のオン／オフを切り替える機能を持つ。 信号 The signal on zener Dl is transmitted and it has a function to switch MOSFET T2 on / off.
Ｔｌ内での抵抗器Ｒ２およびＬＥＤの駆動電圧がＨｉｇｈになると、MOSFET T2が短絡され、抵抗器Ｒ８に直接つながる接地回路を構成する。 When the driving voltage of the resistor R2 and the LED in Tl becomes High, the MOSFET T2 is short-circuited to constitute a ground circuit directly connected to the resistor R8.
外部の調光用トライアックの希望保持電流は、抵抗器Ｒ８にかかる電圧Ｖrectによって計算される。 The desired holding current of the external dimming triac is calculated by the voltage V rect across resistor R8.
図２は、独立回路としてフォトカプラＴｌを持つため、ノイズの大きい作動環境に適しており、より高いノイズ耐性に対応している。 FIG. 2 has a photocoupler Tl as an independent circuit, which is suitable for a noisy operating environment and corresponds to higher noise resistance.
回路においてツェナーＤｌおよびＤ２は、Ｖrect信号が所定の値よりも低い場合に、供給抵抗Ｒ８を挿入するために一定の値にクランプするという重要な役割を果たしている。 In the circuit, the Zeners Dl and D2 play an important role of clamping to a constant value in order to insert the supply resistor R8 when the V rect signal is lower than a predetermined value.
外部から接続されるＡＣ入力がトライアック調光回路に基づくものであっても、抵抗器Ｒ８は、常に動的に挿入される状態にある。 Even if the AC input connected from the outside is based on a triac dimmer circuit, the resistor R8 is always in a state of being dynamically inserted.
図３に、図１に対応した波形ＶＦ２、ＶＰ３、およびＶＦ４を示す。 FIG. 3 shows waveforms VF2, VP3, and VF4 corresponding to FIG.
波形ＶＰ４は、ブリッジダイオード（Ｄｌｌ、Ｄ１２、Ｄ１３、およびＤ１４）により全波整流された信号であり、数百ボルトのピーク電圧を有することがある。 Waveform VP4 is a signal that is full-wave rectified by bridge diodes (Dll, D12, D13, and D14) and may have a peak voltage of several hundred volts.
波形ＶＦ２はＯＮ状態に保たれており、ＶＦ４が所定の閥値よりも低い場合を除き、ＶＦ４に対する負論理を伝えることで、ＶＦ２はＶＦ４を追跡する信号になる。 Waveform VF2 is kept in the ON state, and VF2 becomes a signal for tracking VF4 by transmitting negative logic to VF4 except when VF4 is lower than a predetermined threshold value.
波形ＶＦ３は、図１におけるＴ２がオン状態の時に、論理レベルＬｏｗの期間トライアック調光器が希望の保持電流で作動する様子を示している。 Waveform VF3 shows how the TRIAC dimmer operates at a desired holding current during the logic level Low when T2 in FIG. 1 is in the ON state.
図１において、ＶＦ２の後を信号レベルが所定の閥値電圧よりも低いＶＦ４が追跡するため、Ｒ８は動的供給負荷として適切に作動する。 In FIG. 1, since VF4 whose signal level is lower than a predetermined threshold voltage tracks after VF2, R8 operates appropriately as a dynamic supply load.
図４に、本発明の第１実施例に従うＬＥＤ無点滅回路の概略図を示す。図４において、ＬＥＤ無点滅回路は、電源、トライアック、整流器、ＬＥＤドライバ、自動負荷供給回路、およびＬＥＤアレイから構成される。 FIG. 4 shows a schematic diagram of an LED non-flashing circuit according to the first embodiment of the present invention. In FIG. 4, the LED non-flashing circuit includes a power source, a triac, a rectifier, an LED driver, an automatic load supply circuit, and an LED array.
電源は、電力を供給するために備えられている。トライアックは、電源の電流を変化させるための可変抵抗を有している。 A power supply is provided to supply power. The triac has a variable resistor for changing the current of the power source.
整流器は、正弦波の負の部分を正弦波の正の部分に変換するために備えられている。 A rectifier is provided to convert the negative part of the sine wave to the positive part of the sine wave.
ＬＥＤドライバは、ＬＥＤアレイを駆動するために備えられている。 LED driver is provided to drive the LED array.
整流器とＬＥＤドライバの間に自動負荷供給回路を配置することで、ＬＥＤドライバがＬＥＤアレイに一定の電流を供給することができる。これに従い、自動負荷供給回路により、ＬＥＤアレイはあまり明るくない状態で点灯する。ここで言う自動負荷供給回路は、前述の図１および図２によって実施することができる。 By arranging an automatic load supply circuit between the rectifier and the LED driver, the LED driver can supply a constant current to the LED array. Accordingly, the LED array is lit in a state that is not so bright by the automatic load supply circuit. The automatic load supply circuit referred to here can be implemented according to FIGS. 1 and 2 described above.
スイッチが第１の状態に切り替えられると、ＬＥＤ無点滅回路が作動し、ＬＥＤアレイは非常に明るく点灯する。スイッチが第２の状態に切り替えられると、自動負荷供給装置は作動を停止する。 When the switch is switched to the first state, the LED non-flashing circuit is activated and the LED array lights up very brightly. When the switch is switched to the second state, the automatic load supply device stops operating.
整流器とＬＥＤドライバの間に自動負荷供給回路を配置することで、ＬＥＤの輝度を点滅のない連続的な方法で調整することが可能である。 By arranging an automatic load supply circuit between the rectifier and the LED driver, the brightness of the LED can be adjusted in a continuous manner without blinking.
Claims (2)
第２段階において第１段階で検出した発光可能電圧閾値に基づき、論理レベル変換器により、ＬＥＤに供給すべき電流を、ＬＥＤが発光起動可能な電圧に変換して、発光起動をし、
第３段階において第１段階で検出した発光可能電圧閾値に基づき、動的供給負荷装置により、ＬＥＤに供給すべき電流を、ＬＥＤの発光をちらつきなく発光維持することが可能な電圧に変換して、発光無点滅維持をすることを特徴とするＬＥＤ調光器の無点滅方法。 In the first stage, the threshold level detector detects the threshold voltage at which the LED can emit light,
Based on the light-emitable voltage threshold detected in the first step in the second step, the logic level converter converts the current to be supplied to the LED into a voltage at which the LED can start light emission, and starts light emission.
In the third stage, based on the light emission possible voltage threshold detected in the first stage, the dynamic supply load device converts the current to be supplied to the LED into a voltage that can maintain the light emission of the LED without flickering. The method of non-flashing the LED dimmer characterized by maintaining the non-flashing of light emission.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| US38597610P | 2010-09-24 | 2010-09-24 | |
| US61/385976 | 2010-09-24 |
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| WO2012039070A1 true WO2012039070A1 (en) | 2012-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2010/070970 Ceased WO2012039070A1 (en) | 2010-09-24 | 2010-11-25 | Non-blinking light-emission maintaining method for led dimmer, and non-blinking light-emission maintaining apparatus for led dimmer |
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| WO (1) | WO2012039070A1 (en) |
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