JP2006310617A - Led driving control method and led driving control apparatus - Google Patents

Led driving control method and led driving control apparatus Download PDF

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JP2006310617A
JP2006310617A JP2005132404A JP2005132404A JP2006310617A JP 2006310617 A JP2006310617 A JP 2006310617A JP 2005132404 A JP2005132404 A JP 2005132404A JP 2005132404 A JP2005132404 A JP 2005132404A JP 2006310617 A JP2006310617 A JP 2006310617A
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led
temperature
unit
voltage
operating voltage
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Kazuhiro Sakai
和宏 酒井
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Toyoda Gosei Co Ltd
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Toyoda Gosei Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To control the temperature of an LED without depending on the structure of an LED mounting apparatus or the difference in temperature measurement method, thereby stabilizing the optical amount of the LED. <P>SOLUTION: An LED driving control method has a step of measuring the operation voltage of the LED, and a control step of controlling the temperature of the LED on the basis of the operation voltage. The operation voltage of the LED changes, depending on the temperature of the LED. The optical amount of the LED also changes, depending on the temperature of the LED. Accordingly, the operation voltage is measured by the LED driving control method to estimate the temperature of the LED and the temperature of the LED is controlled so that the temperature may be a predetermined temperature, and thus, the optical amount of the LED can be controlled. In this LED driving control method, the temperature of the LED can be controlled without depending on the structure of the LED mounting apparatus, thereby stabilizing the optical amount of the LED. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はＬＥＤ駆動制御方法及びＬＥＤ駆動制御装置に関する。   The present invention relates to an LED drive control method and an LED drive control device.

近年、表示部分の光源として長寿命のＬＥＤが使用されている。基板上にＬＥＤが高密度で実装される場合、ＬＥＤで生じる熱は、基板及び空気中へと排熱されるが、加熱する割合が排熱する割合よりも大きいとき、ＬＥＤの温度が上昇する。一般に、ＬＥＤは熱に弱く、ＬＥＤが温度変化することにより、ＬＥＤの光量が不安定になるという問題がある。
この問題を解決する方法として、ＬＥＤの環境温度をサーミスタにより測定し、ファンやヒータを用いて、環境温度を所定の温度に制御する方法が提案されている（例えば、特許文献１参照）。
また、本件に関する技術として、以下の文献を参照されたい（例えば、特許文献２、３参照）。
特開２００４−２５９８４１号公報 特開平１０−２７９２６号公報 特開２０００−３１５４６号公報 In recent years, LEDs having a long lifetime have been used as light sources for display portions. When the LEDs are mounted at high density on the substrate, the heat generated in the LEDs is exhausted into the substrate and the air, but when the heating rate is higher than the exhaust heat rate, the temperature of the LED rises. Generally, LEDs are vulnerable to heat, and there is a problem that the amount of light of the LEDs becomes unstable due to temperature changes of the LEDs.
As a method for solving this problem, a method has been proposed in which the ambient temperature of an LED is measured by a thermistor and the ambient temperature is controlled to a predetermined temperature using a fan or a heater (see, for example, Patent Document 1).
Moreover, please refer to the following documents as a technique regarding this case (for example, refer patent documents 2 and 3).
JP 2004-259841 A JP-A-10-27926 JP 2000-31546 A

しかしながら、特許文献１の発明は、ＬＥＤ装置の構造やサーミスタの取り付け位置によって、温度の測定精度が変動する。そのため、必ずしも所望の温度制御ができるとは限らず、ＬＥＤの光量を不安定にさせることもある。
そこで、本発明は、ＬＥＤ装置の構造の違いやサーミスタ等の温度測定装置の取り付け位置の差異に依存することなく、ＬＥＤの温度を制御し、ＬＥＤの光量を安定化することを目的とする。 However, in the invention of Patent Document 1, the temperature measurement accuracy varies depending on the structure of the LED device and the attachment position of the thermistor. Therefore, the desired temperature control is not always possible, and the light quantity of the LED may be made unstable.
Therefore, an object of the present invention is to control the temperature of the LED and stabilize the light amount of the LED without depending on the difference in the structure of the LED device or the difference in the mounting position of the temperature measuring device such as the thermistor.

本発明は以上の目的を達成するために、次の構成からなる。即ち、
ＬＥＤの動作電圧を測定するステップと、
前記動作電圧に基づき前記ＬＥＤの温度を制御する制御ステップと、
を有するＬＥＤ駆動制御方法である。 In order to achieve the above object, the present invention has the following configuration. That is,
Measuring the operating voltage of the LED;
A control step of controlling the temperature of the LED based on the operating voltage;
It is the LED drive control method which has this.

ＬＥＤの動作電圧は、ＬＥＤの温度に依存し変化する。ＬＥＤの光量も、ＬＥＤの温度に依存して変化する。そのため、上記ＬＥＤ駆動制御方法によって、動作電圧を測定し、ＬＥＤの温度を推定し、その温度が所定の温度となるようにＬＥＤの温度を制御することで、ＬＥＤの光量を制御することが可能となる。
よって、本発明のＬＥＤ駆動制御方法では、ＬＥＤ実装装置の構造に依存することなく、ＬＥＤの温度を制御し、ＬＥＤの光量を安定化させることが可能となる。 The operating voltage of the LED varies depending on the temperature of the LED. The light quantity of the LED also changes depending on the LED temperature. Therefore, it is possible to control the amount of LED light by measuring the operating voltage, estimating the LED temperature, and controlling the LED temperature so that the temperature becomes a predetermined temperature by the above LED drive control method. It becomes.
Therefore, in the LED drive control method of the present invention, it is possible to control the LED temperature and stabilize the LED light amount without depending on the structure of the LED mounting apparatus.

以下、本発明の構成要素について詳細に説明する。
（ＬＥＤ）
本発明で使用するＬＥＤのタイプは特に限定されない。例えば、表面実装型ＬＥＤを使用する。ＬＥＤの発光色も特に限定されない。例えば、青色ＬＥＤのみでもよい。また、赤色ＬＥＤ、緑色ＬＥＤ、青色ＬＥＤの三色を使用してもよい。 Hereinafter, the constituent elements of the present invention will be described in detail.
(LED)
The type of LED used in the present invention is not particularly limited. For example, a surface mount type LED is used. The emission color of the LED is not particularly limited. For example, only a blue LED may be used. Moreover, you may use three colors, red LED, green LED, and blue LED.

（動作電圧、電圧測定部）
ＬＥＤの動作電圧はＬＥＤの温度の変化によって変動する。そのため、ＬＥＤの動作電圧を測定することにより、ＬＥＤの温度を推定することができる。具体的には、電圧測定部は、一又は二以上のＬＥＤ素子の端子電圧(電圧降下)を測定することで、ＬＥＤの温度を推定する。
ＬＥＤの電圧の測定方法は、特に限定されない。例えば、一つのＬＥＤ素子の両端の電圧を直接測定してもよい。また、複数のＬＥＤが直列接続されている回路の場合は、直列接続されている回路の両端部分の電圧を測定してもよい。ＬＥＤに、電流制御のための抵抗が接続されている場合は、抵抗も含む回路の両端部分の電圧を測定してもよい。
なお、図１に示すような、ＬＥＤと抵抗との直列回路が、並列接続されている場合、該直列回路を一定電流で駆動する際、一つの直列回路におけるＬＥＤについて、温度変化が生じたとき、当該直列回路に印加される電圧が変化するため、当該ＬＥＤに接続された抵抗の端子電圧も変化する。そのため、抵抗の端子電圧を測定することで、ＬＥＤの温度を推定してもよい。 (Operating voltage, voltage measurement unit)
The operating voltage of the LED varies with changes in the LED temperature. Therefore, the temperature of the LED can be estimated by measuring the operating voltage of the LED. Specifically, a voltage measurement part estimates the temperature of LED by measuring the terminal voltage (voltage drop) of one or two or more LED elements.
The method for measuring the LED voltage is not particularly limited. For example, you may measure the voltage of the both ends of one LED element directly. In the case of a circuit in which a plurality of LEDs are connected in series, the voltage at both ends of the circuit connected in series may be measured. When a resistor for current control is connected to the LED, the voltage at both ends of the circuit including the resistor may be measured.
When a series circuit of an LED and a resistor as shown in FIG. 1 is connected in parallel, when the series circuit is driven with a constant current, a temperature change occurs in the LEDs in one series circuit. Since the voltage applied to the series circuit changes, the terminal voltage of the resistor connected to the LED also changes. Therefore, the temperature of the LED may be estimated by measuring the terminal voltage of the resistor.

（温度推定部）
温度推定部は、電圧測定部で測定された電圧からＬＥＤの温度を推定する。
温度推定部は、その内部に記憶部（例えば、メモリ）を有しており、記憶部にＬＥＤの電圧とＬＥＤの温度との関係が保存されている。
温度推定部は電圧測定部から電圧の情報を受け取り、上記電圧とＬＥＤの温度との関係を参照して、その電圧に対応する温度の情報を推定する。得られた温度は比較部に送られる。 (Temperature estimation part)
A temperature estimation part estimates the temperature of LED from the voltage measured by the voltage measurement part.
The temperature estimation unit includes a storage unit (for example, a memory) therein, and a relationship between the LED voltage and the LED temperature is stored in the storage unit.
The temperature estimation unit receives voltage information from the voltage measurement unit, refers to the relationship between the voltage and the LED temperature, and estimates temperature information corresponding to the voltage. The obtained temperature is sent to the comparison unit.

（比較部）
比較部は、温度推定部で得られた温度と、ＬＥＤが安定して動作できる基準値とを比較し、比較結果を得る。基準値は、事前に設定してもよい。また、ＬＥＤの使用環境に応じて変更してもよい。 (Comparison part)
The comparison unit compares the temperature obtained by the temperature estimation unit with a reference value at which the LED can stably operate, and obtains a comparison result. The reference value may be set in advance. Moreover, you may change according to the use environment of LED.

（温度制御部）
温度制御部は、比較部から比較結果を受け取り、その比較結果から制御情報を生成して、装置駆動部に制御情報を送信する。制御情報は、ＬＥＤの温度制御装置（ファン、ヒーターやペルチェ素子など）の入出力を制御するための情報である。装置駆動部は、制御情報を受けて温度制御装置を制御し、ＬＥＤの温度を基準値に近づける。
ＬＥＤの冷却方法は特に限定されないが、例えば、ファンやペルチェ素子を使用してＬＥＤの雰囲気温度を冷却する。ＬＥＤの加熱方法も特に限定されないが、例えば、ヒータやペルチェ素子を使用してＬＥＤの雰囲気温度を加熱する。 (Temperature controller)
The temperature control unit receives the comparison result from the comparison unit, generates control information from the comparison result, and transmits the control information to the apparatus driving unit. The control information is information for controlling the input / output of the LED temperature control device (fan, heater, Peltier element, etc.). The device drive unit receives the control information and controls the temperature control device to bring the LED temperature close to the reference value.
Although the cooling method of LED is not specifically limited, For example, the ambient temperature of LED is cooled using a fan or a Peltier device. Although the heating method of LED is not particularly limited, for example, the atmosphere temperature of LED is heated using a heater or a Peltier element.

図１に本発明の実施例であるＬＥＤ駆動制御装置１及びＬＥＤ装置１０の概略図を示す。
ＬＥＤ装置１０は、複数のＬＥＤ１３が基板上に直列に接続され、それに可変抵抗１２が直列に接続される。各ＬＥＤ１３は電源１４から電力が供給されて動作する。また、ＬＥＤ１３を冷却するための温度制御装置（ペルチェ素子）１５がＬＥＤ１３の配置方向に設置されている。
ＬＥＤ駆動制御装置１は、ＬＥＤ１３の直列回路の両端Ａ−Ａの端子電圧を測定する電圧測定部２と、その端子電圧からＬＥＤの温度を推定する温度推定部３と、その温度から比較結果を得る比較部４と、比較結果から制御情報を生成する温度制御部５を備える。 FIG. 1 shows a schematic diagram of an LED drive control device 1 and an LED device 10 according to an embodiment of the present invention.
In the LED device 10, a plurality of LEDs 13 are connected in series on a substrate, and a variable resistor 12 is connected in series thereto. Each LED 13 is operated with power supplied from a power source 14. Further, a temperature control device (Peltier element) 15 for cooling the LED 13 is installed in the arrangement direction of the LED 13.
The LED drive control device 1 includes a voltage measurement unit 2 that measures the terminal voltage at both ends AA of the series circuit of the LED 13, a temperature estimation unit 3 that estimates the LED temperature from the terminal voltage, and a comparison result from the temperature. A comparison unit 4 to be obtained and a temperature control unit 5 for generating control information from the comparison result are provided.

ＬＥＤ１３は電源から電力が供給されることで発光する。可変抵抗１２を用いて、ＬＥＤ１３に流れる電流を調整することにより、ＬＥＤ１３の光量を調整することができる。
ＬＥＤ１３は時間の経過とともに加熱される。その熱は基板を通じて、又は空気中へと拡散されるが、熱が加熱される割合が拡散される割合よりも高ければ、ＬＥＤ１３の温度は上昇する。通常、ＬＥＤは、その温度の変化に伴って、動作電圧が変化する。そのため、ＬＥＤ１３の電圧を測定することにより、ＬＥＤの温度を測定し、この温度から温度制御を行う。 The LED 13 emits light when power is supplied from a power source. The light quantity of the LED 13 can be adjusted by adjusting the current flowing through the LED 13 using the variable resistor 12.
The LED 13 is heated over time. The heat is diffused through the substrate or into the air, but if the rate at which the heat is heated is higher than the rate at which it is diffused, the temperature of the LED 13 will rise. Usually, the operating voltage of an LED changes as its temperature changes. Therefore, the temperature of LED is measured by measuring the voltage of LED13, and temperature control is performed from this temperature.

電圧測定部２はＬＥＤ１３の直列回路の両端Ａ−Ａの電圧を測定する。測定された電圧は温度推定部３に送られ、記憶部にある電圧−温度関係の中から、測定された電圧に対する温度を推定する。その温度は比較部４へ送られ、温度と基準値とを比較し、比較結果を生成する。その比較結果は温度制御部５へと送られる。温度制御部５は比較結果からＬＥＤ１３の温度を基準値にするために必要な制御情報（冷却又は加熱の情報）を生成し、装置駆動部１６へ送る。装置駆動部１６は、制御情報の内容に応じて温度制御装置１５を駆動し、ＬＥＤの雰囲気温度を冷却又は加熱を行う。
以上のようなＬＥＤ駆動制御装置を用いることによって、ＬＥＤの電圧を測定することにより、ＬＥＤの温度を推定し、その温度が基準値となるようにＬＥＤの温度を制御することで、ＬＥＤの光量を制御することが可能となる。 The voltage measuring unit 2 measures the voltage at both ends AA of the series circuit of the LED 13. The measured voltage is sent to the temperature estimation unit 3, and the temperature for the measured voltage is estimated from the voltage-temperature relationship in the storage unit. The temperature is sent to the comparison unit 4, and the temperature is compared with a reference value to generate a comparison result. The comparison result is sent to the temperature controller 5. The temperature control unit 5 generates control information (cooling or heating information) necessary for setting the temperature of the LED 13 to the reference value from the comparison result, and sends the control information to the device driving unit 16. The device drive unit 16 drives the temperature control device 15 according to the content of the control information, and cools or heats the ambient temperature of the LED.
By using the LED drive control device as described above, the LED voltage is estimated by measuring the LED voltage, and the LED temperature is controlled so that the temperature becomes the reference value. Can be controlled.

図２は本発明の他の実施例であるＬＥＤ駆動制御装置１及びＬＥＤ装置２０の概略図である。実施例１と同一の要素には同一の符号を付してその説明を省略する。なお、温度制御装置２５はファンを使用しており、ＬＥＤ駆動制御装置１により制御される。
発光部は、赤色ＬＥＤ２３a、青色ＬＥＤ２３b、緑色ＬＥＤ２３cをそれぞれ複数個を直列接続したものが、並列に三列設置されている。
ＬＥＤの温度を各色のＬＥＤ毎について測定し、温度調整を行うこともできるが、温度制御の処理が煩雑になることと、各色の温度特性の中で、赤色ＬＥＤ２３aが最も温度変化に対して敏感なことから、赤色ＬＥＤ２３aの温度のみ測定し、全体のＬＥＤの温度制御を行う。
電圧の測定から温度制御までの方法は実施例１と同様であるため、その説明を省略する。
以上のように、赤色ＬＥＤ、青色ＬＥＤ、緑色ＬＥＤで構成されるＬＥＤ装置において、各ＬＥＤの駆動制御をするとき、赤色ＬＥＤの温度を測定して温度を推定することにより、残りの青色ＬＥＤ、緑色ＬＥＤについても温度制御をし、各ＬＥＤの光量を制御することが可能となる。 FIG. 2 is a schematic diagram of an LED drive control device 1 and an LED device 20 according to another embodiment of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The temperature control device 25 uses a fan and is controlled by the LED drive control device 1.
In the light emitting section, a plurality of red LEDs 23a, blue LEDs 23b, and green LEDs 23c connected in series are arranged in three rows in parallel.
The temperature of the LEDs can be measured for each color LED and the temperature can be adjusted. However, the temperature control process becomes complicated, and the red LED 23a is most sensitive to temperature changes among the temperature characteristics of each color. Therefore, only the temperature of the red LED 23a is measured to control the temperature of the entire LED.
Since the method from the voltage measurement to the temperature control is the same as that of the first embodiment, the description thereof is omitted.
As described above, in the LED device composed of a red LED, a blue LED, and a green LED, when driving and controlling each LED, by measuring the temperature of the red LED and estimating the temperature, the remaining blue LEDs, It is possible to control the temperature of the green LED and control the light quantity of each LED.

図３は本発明の他の実施例であるＬＥＤ装置３０の概観図である。ＬＥＤ駆動制御装置１を用いて、ＬＥＤ装置３０の組み立て品質のチェックを行う。
ＬＥＤ３３は基板３４上に実装される。基板３４はグリース３８を介してヒートシンク３９の上に設置される。グリース３８は熱伝導性が良く、また、基板３４とヒートシンク３９との密着性を高め、ＬＥＤ３３の熱をヒートシンク３９へ効率的に排熱するために使用する。
上記構成によるＬＥＤ装置３０において、ＬＥＤ３３の端子電圧をＬＥＤ駆動制御装置１により測定する。電圧が所定の基準値よりも高い場合、基板３４、グリース３８とヒートシンク３９との密着性が悪く、ＬＥＤ３３からの排熱性に問題が生じている可能性があるので、基板３４、グリース３８とヒートシンク３９との密着の具合を調整する。他方、電圧が基準値より低い場合は、周囲のＬＥＤとの電圧−温度特性が異なるおそれがあるので、可変抵抗３２を調整して、電流量を調整し、当該ＬＥＤの光量を調整し、周囲のＬＥＤの光量と同調させることができる。もしくは、周囲のＬＥＤと電圧−温度特性の類似のものと交換し、光量を同調させることができる。
以上のように、ＬＥＤ駆動制御装置を用いることにより、ＬＥＤ装置の組み立て品質をチェックすることが可能となる。このチェックは、ＬＥＤ装置の組み立て時のみならず、組み立て後の品質チェックとしても利用される。 FIG. 3 is a schematic view of an LED device 30 according to another embodiment of the present invention. The assembly quality of the LED device 30 is checked using the LED drive control device 1.
The LED 33 is mounted on the substrate 34. The substrate 34 is placed on the heat sink 39 via the grease 38. The grease 38 has a good thermal conductivity, improves the adhesion between the substrate 34 and the heat sink 39, and is used to efficiently exhaust the heat of the LED 33 to the heat sink 39.
In the LED device 30 configured as described above, the terminal voltage of the LED 33 is measured by the LED drive control device 1. When the voltage is higher than a predetermined reference value, the adhesion between the substrate 34, the grease 38 and the heat sink 39 is poor, and there is a possibility that a problem is caused in the heat exhaustion from the LED 33. The degree of close contact with 39 is adjusted. On the other hand, if the voltage is lower than the reference value, the voltage-temperature characteristic may be different from that of the surrounding LED. Therefore, the variable resistor 32 is adjusted to adjust the amount of current, the light quantity of the LED is adjusted, It can be synchronized with the light quantity of the LED. Alternatively, the light quantity can be tuned by replacing the surrounding LED with a similar one having voltage-temperature characteristics.
As described above, the assembly quality of the LED device can be checked by using the LED drive control device. This check is used not only when the LED device is assembled, but also as a quality check after assembly.

この発明は上記発明の実施の態様及び実施例の説明に何ら限定されるものではない。特許請求の範囲を逸脱せず、当業者が容易に想到できる範囲で種々の変形態様もこの発明に含まれる。   The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications are also included in the present invention as long as those skilled in the art can easily conceive without departing from the scope of the claims.

図１は実施例１で使用するＬＥＤ装置及びＬＥＤ駆動制御装置の概略図である。FIG. 1 is a schematic diagram of an LED device and an LED drive control device used in the first embodiment. 図２は実施例２で使用するＬＥＤ装置及びＬＥＤ駆動制御装置の概略図である。FIG. 2 is a schematic diagram of an LED device and an LED drive control device used in the second embodiment. 図３は実施例３で使用するＬＥＤ装置の概観図である。FIG. 3 is an overview of the LED device used in Example 3.

符号の説明Explanation of symbols

１ ＬＥＤ駆動制御装置
２ 電圧測定部
３ 温度推定部
４ 比較部
５ 温度制御部
１０ ２０ ３０ ＬＥＤ装置
１３ ２３ ３３ ＬＥＤ
１５ ペルチェ素子
１６ 装置駆動部
２５ ３５ ファン 1 LED drive control device
2 Voltage measurement unit
3 Temperature estimation part
4 Comparison part 5 Temperature control part
10 20 30 LED device
13 23 33 LED
15 Peltier elements
16 Device drive unit 25 35 Fan

Claims (7)

ＬＥＤの動作電圧を測定するステップと、
前記動作電圧に基づき前記ＬＥＤの温度を制御する制御ステップと、
を有するＬＥＤ駆動制御方法。 Measuring the operating voltage of the LED;
A control step of controlling the temperature of the LED based on the operating voltage;
LED drive control method comprising: 前記制御ステップは、
前記動作電圧から前記ＬＥＤの温度を推定するステップと、
前記推定した温度と基準値とを比較する比較ステップと、
前記比較ステップの比較結果に基づき、前記ＬＥＤの温度を制御するステップと、
を有する、ことを特徴とする請求項１に記載のＬＥＤ駆動制御方法。 The control step includes
Estimating the temperature of the LED from the operating voltage;
A comparison step of comparing the estimated temperature with a reference value;
Controlling the temperature of the LED based on the comparison result of the comparison step;
The LED drive control method according to claim 1, further comprising: 前記制御ステップは、
前記動作電圧から前記ＬＥＤの発光量を推定するステップと、
前記推定した発光量と基準値とを比較する比較ステップと、
前記比較ステップの比較結果に基づき、前記ＬＥＤの温度を制御するステップと、
を有する、ことを特徴とする請求項１に記載のＬＥＤ駆動制御方法。 The control step includes
Estimating the light emission amount of the LED from the operating voltage;
A comparison step of comparing the estimated light emission amount with a reference value;
Controlling the temperature of the LED based on the comparison result of the comparison step;
The LED drive control method according to claim 1, further comprising: ＬＥＤの動作電圧を測定する電圧測定部と、
前記動作電圧に基づき前記ＬＥＤの温度を制御する制御部と、
を備えるＬＥＤ駆動制御装置。 A voltage measuring unit for measuring the operating voltage of the LED;
A control unit for controlling the temperature of the LED based on the operating voltage;
LED drive control device. 前記制御部は、
前記動作電圧から前記ＬＥＤの温度を推定する温度推定部と、
前記推定した温度と基準値と比較する比較部と、
前記比較部の比較結果に基づき、前記ＬＥＤの温度を制御する温度制御部と、
を備える、ことを特徴とする請求項４に記載のＬＥＤ制御装置。 The controller is
A temperature estimation unit for estimating the temperature of the LED from the operating voltage;
A comparison unit for comparing the estimated temperature with a reference value;
Based on the comparison result of the comparison unit, a temperature control unit for controlling the temperature of the LED;
The LED control device according to claim 4, comprising: 前記制御部は、
前記動作電圧から前記ＬＥＤの発光量を推定する温度推定部と、
前記推定した発光量と基準値と比較する比較部と、
前記比較部の比較結果に基づき、前記ＬＥＤの温度を制御する温度制御部と、
を備える、ことを特徴とする請求項４に記載のＬＥＤ制御装置。 The controller is
A temperature estimation unit for estimating the light emission amount of the LED from the operating voltage;
A comparison unit for comparing the estimated light emission amount with a reference value;
Based on the comparison result of the comparison unit, a temperature control unit for controlling the temperature of the LED;
The LED control device according to claim 4, comprising: 赤色ＬＥＤ、緑色ＬＥＤ及び青色ＬＥＤを備える発光部の駆動制御方法であって、
前記赤色ＬＥＤの動作電圧を測定するステップと、
該動作電圧に基づき、前記発光部の温度制御を行うステップと、
を有するＬＥＤ駆動制御方法。 A drive control method for a light emitting unit including a red LED, a green LED, and a blue LED,
Measuring the operating voltage of the red LED;
Performing temperature control of the light emitting unit based on the operating voltage;
LED drive control method comprising:
JP2005132404A 2005-04-28 2005-04-28 Led driving control method and led driving control apparatus Pending JP2006310617A (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007242427A (en) * 2006-03-09 2007-09-20 Hitachi Displays Ltd Led lighting system, and liquid crystal display device using it
JP2009099497A (en) * 2007-10-19 2009-05-07 Maruwa Co Ltd Light-emitting device, and light-emitting diode module for the same
JP2009152192A (en) * 2007-12-21 2009-07-09 Foxsemicon Intergated Technology Inc Light emitting diode lamp
JP2012169282A (en) * 2012-04-13 2012-09-06 Toshiba Lighting & Technology Corp Lighting device
CN104154467A (en) * 2014-08-15 2014-11-19 深圳市美格朗半导体照明有限公司 Track lamp system capable of adjusting color temperature based on mobile intelligent terminal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007242427A (en) * 2006-03-09 2007-09-20 Hitachi Displays Ltd Led lighting system, and liquid crystal display device using it
JP2009099497A (en) * 2007-10-19 2009-05-07 Maruwa Co Ltd Light-emitting device, and light-emitting diode module for the same
JP4724700B2 (en) * 2007-10-19 2011-07-13 株式会社Ｍａｒｕｗａ Light emitting device
JP2009152192A (en) * 2007-12-21 2009-07-09 Foxsemicon Intergated Technology Inc Light emitting diode lamp
JP2012169282A (en) * 2012-04-13 2012-09-06 Toshiba Lighting & Technology Corp Lighting device
CN104154467A (en) * 2014-08-15 2014-11-19 深圳市美格朗半导体照明有限公司 Track lamp system capable of adjusting color temperature based on mobile intelligent terminal

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