JP6090824B2 - LED lighting device - Google Patents

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JP6090824B2
JP6090824B2 JP2012159928A JP2012159928A JP6090824B2 JP 6090824 B2 JP6090824 B2 JP 6090824B2 JP 2012159928 A JP2012159928 A JP 2012159928A JP 2012159928 A JP2012159928 A JP 2012159928A JP 6090824 B2 JP6090824 B2 JP 6090824B2
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茂樹 谷口
茂樹 谷口
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Hotalux Ltd
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NEC Lighting Ltd
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Description

本発明は、ＬＥＤ点灯装置に関する。   The present invention relates to an LED lighting device.

近年、ＬＥＤ照明器具の普及に伴い、調光だけでなく、調色も可能な製品が出てきた。   In recent years, with the widespread use of LED lighting fixtures, not only dimming but also products that can be toned have come out.

特許文献１には、ＬＥＤの光束を変化させて調光制御するＬＥＤ調光用点灯装置において、ＬＥＤが発光する色のシフトを少なくしながら調光を行う点灯回路が開示されている。   Patent Document 1 discloses a lighting circuit that performs dimming while reducing a shift in color emitted by an LED in an LED dimming lighting device that performs dimming control by changing the luminous flux of the LED.

特許文献２には、ＬＥＤの不要な点灯を防止することができ、電源効率が高いＬＥＤ駆動回路が開示されている。   Patent Document 2 discloses an LED drive circuit that can prevent unnecessary lighting of an LED and has high power supply efficiency.

特開２００９−２７７５１４号公報JP 2009-277514 A 特開２０１０−０９２７７６号公報JP 2010-092776 A

しかしながら、定電流動作でＬＥＤの調光を行う際、調光率が１％を切るような微少電流を流す場合ではマイクロコンピュータの出力や他回路の応答性、ノイズの影響などにより、制御が難しくなる。   However, when dimming an LED with constant current operation, if a very small current that causes the dimming rate to drop below 1% is applied, control is difficult due to the output of the microcomputer, the response of other circuits, the influence of noise, etc. Become.

また、一般的にＬＥＤが発熱すると順方向電圧が低下する。たとえば、昼光色と電球色との組み合わせで調色を行う場合、昼光色のＬＥＤを有する第１のＬＥＤ回路に十分な電流を流し、電球色のＬＥＤを有する第２のＬＥＤ回路に微少電流を流し、定電流動作で点灯させるとすると、第１のＬＥＤ回路では、発熱に伴ってＬＥＤで消費される電力が低下して明るさが低下する。   In general, when the LED generates heat, the forward voltage decreases. For example, when toning is performed with a combination of daylight color and light bulb color, a sufficient current is supplied to the first LED circuit having the daylight color LED, and a minute current is supplied to the second LED circuit having the light bulb color LED. If the light is lit in a constant current operation, in the first LED circuit, the power consumed by the LED decreases as the heat is generated, and the brightness decreases.

これに対して、第２のＬＥＤ回路には微少の電流しか流さないため、発熱がほぼなく、ＬＥＤで消費される電力の低下を起こさないので、明るさは低下しない。このため、昼光色と電球色のバランスが崩れて、色が変化してしまう。   On the other hand, since only a very small current flows through the second LED circuit, there is almost no heat generation and no reduction in power consumed by the LED occurs, so the brightness does not decrease. For this reason, the balance between the daylight color and the light bulb color is lost, and the color changes.

特許文献１に記載の技術は、ＬＥＤを流れる直流電流の変化による色のシフトを防ぐものであって、一部のＬＥＤ回路のＬＥＤの発熱により起こる可能性がある組み合わせの色の変化を防ぐものではない。   The technique described in Patent Document 1 prevents a color shift due to a change in a direct current flowing through an LED, and prevents a change in the color of a combination that may occur due to heat generation of the LEDs of some LED circuits. is not.

特許文献２には、二つのＬＥＤモジュールを備える構成が記載されているが、一部のＬＥＤ回路のＬＥＤの発熱により起こる可能性がある組み合わせの色の変化を防ぐものではない。   Patent Document 2 describes a configuration including two LED modules, but does not prevent a change in color of a combination that may occur due to heat generation of LEDs of some LED circuits.

本発明は、２以上のＬＥＤ回路を用いてＬＥＤを点灯させて調光調色を行う際、微少電流領域の電流を流すことができ、かつ、一部のＬＥＤ回路のＬＥＤの発熱により起こる可能性がある組み合わせの色の変化を最小限に抑えることができるＬＥＤ点灯装置を提供することを目的とする。   In the present invention, when dimming and toning light by turning on an LED using two or more LED circuits, a current in a very small current region can flow, and it can occur due to heat generation of LEDs in some LED circuits. It is an object of the present invention to provide an LED lighting device capable of minimizing a change in color of a flexible combination.

本発明にかかるＬＥＤ点灯装置は、
第１のＬＥＤ回路と、前記第１のＬＥＤ回路のＬＥＤと異なる色のＬＥＤを有する第２のＬＥＤ回路とを備え、調光調色を行うＬＥＤ点灯装置であって、
前記第１のＬＥＤ回路のＬＥＤの両端が、スイッチ素子および電圧制限用素子を介して、前記第２のＬＥＤ回路のＬＥＤの両端に直接、または、抵抗を挟んで接続されており、前記第１のＬＥＤ回路は前記第２のＬＥＤ回路から電源を受給することを特徴とする。 LED lighting device according to the present invention,
An LED lighting device that includes a first LED circuit and a second LED circuit having an LED of a different color from the LED of the first LED circuit, and performs dimming and toning,
Both ends of the LED of the first LED circuit are connected directly or both ends of the LED of the second LED circuit via a switch element and a voltage limiting element, with the resistor interposed therebetween. The LED circuit receives power from the second LED circuit.

本発明によれば、２以上のＬＥＤ回路を用いてＬＥＤを点灯させて調光調色を行う際、微少電流領域の電流を流すことができ、かつ、一部のＬＥＤ回路のＬＥＤの発熱により起こる可能性がある組み合わせの色の変化を最小限に抑えることができる。   According to the present invention, when dimming toning by turning on an LED using two or more LED circuits, a current in a very small current region can be passed, and due to heat generation of the LEDs of some LED circuits. The possible color changes of the combination can be minimized.

ＬＥＤ点灯回路が２つある場合のＬＥＤ点灯装置の一般的な回路図である。It is a general circuit diagram of an LED lighting device when there are two LED lighting circuits. ＬＥＤ点灯回路が２つある場合のＬＥＤ点灯装置のＬＥＤ点灯回路の一例を示す回路図である。It is a circuit diagram which shows an example of the LED lighting circuit of an LED lighting device in case there are two LED lighting circuits. ＬＥＤ点灯装置の調光調色パターンの一例を示す図である。It is a figure which shows an example of the light control toning pattern of a LED lighting device. 実施の形態に係るＬＥＤ回路の一例を示す図である。It is a figure which shows an example of the LED circuit which concerns on embodiment. 実施の形態に係るＬＥＤ回路の他の例を示す図である。It is a figure which shows the other example of the LED circuit which concerns on embodiment. 実施の形態に係るＬＥＤ回路の具体例を示す図である。It is a figure which shows the specific example of the LED circuit which concerns on embodiment. 実施の形態に係るＬＥＤ回路の他の具体例を示す図である。It is a figure which shows the other specific example of the LED circuit which concerns on embodiment. 実施の形態に係るＬＥＤ回路の他の具体例を示す図である。It is a figure which shows the other specific example of the LED circuit which concerns on embodiment. 実施の形態に係る両方のＬＥＤ回路のＬＥＤを微少電流で点灯させる場合のＬＥＤ回路の一例を示す図である。It is a figure which shows an example of the LED circuit in the case of lighting LED of both the LED circuits which concern on embodiment with a micro current.

以下、本発明の実施の形態について説明する。   Embodiments of the present invention will be described below.

図１は、ＬＥＤ点灯回路が２つある場合のＬＥＤ点灯装置の一般的な回路図である。ＬＥＤ点灯装置内にＬＥＤ点灯回路が２つある場合、たとえば、各ＬＥＤ点灯回路は、定電流回路であって、ＰＦＣ（Power Factor Correction）を介してそれぞれ電源が供給され、各ＬＥＤには、一定の安定した電流が流れる。   FIG. 1 is a general circuit diagram of an LED lighting device when there are two LED lighting circuits. When there are two LED lighting circuits in the LED lighting device, for example, each LED lighting circuit is a constant current circuit, and power is supplied via PFC (Power Factor Correction), and each LED is constant. A stable current flows.

図２は、ＬＥＤ点灯回路が２つある場合のＬＥＤ点灯装置のＬＥＤ点灯回路の一例を示す回路図である。図２では、ＬＥＤ点灯回路としてフライバック回路の例を示す。抵抗Ｒ１、コンデンサＣ２およびダイオードＤ２と、抵抗Ｒ３、コンデンサＣ４およびダイオードＤ４とはスナバ回路用部品であり、抵抗ＲＳ１および抵抗ＲＳ２は出力電流検出用抵抗である。   FIG. 2 is a circuit diagram showing an example of the LED lighting circuit of the LED lighting device when there are two LED lighting circuits. FIG. 2 shows an example of a flyback circuit as the LED lighting circuit. The resistor R1, the capacitor C2, and the diode D2, and the resistor R3, the capacitor C4, and the diode D4 are snubber circuit components, and the resistor RS1 and the resistor RS2 are output current detection resistors.

ＬＥＤ回路１０に流れる電流について説明する。制御用ＩＣがトランジスタＱ１のＯＮ−ＯＦＦを制御する。トランジスタＱ１がＯＮになると、トランスＴ１の一次コイルに電流が流れ、発生する磁束によりコアが磁化される。このとき、ダイオードＤ１の向きが逆なので、ＬＥＤ回路１０にはトランスＴ１による電流は流れない。トランジスタＱ１がＯＦＦになると、コアに蓄積されたエネルギーが開放されて、ダイオードＤ１の向きに電流が流れる。ＬＥＤ回路２０に流れる電流についても同様である。   The current flowing through the LED circuit 10 will be described. The control IC controls ON / OFF of the transistor Q1. When the transistor Q1 is turned on, a current flows through the primary coil of the transformer T1, and the core is magnetized by the generated magnetic flux. At this time, since the direction of the diode D1 is reverse, no current flows through the LED circuit 10 due to the transformer T1. When the transistor Q1 is turned off, the energy stored in the core is released, and a current flows in the direction of the diode D1. The same applies to the current flowing through the LED circuit 20.

ＬＥＤ回路１０およびＬＥＤ回路２０は、それぞれ、フィードバック回路を介して制御用ＩＣと接続されている。このフィードバック回路がフォトカプラ等により絶縁されていれば、ＬＥＤ回路１０およびＬＥＤ回路２０は互いに電気的に浮いている状態になる。   The LED circuit 10 and the LED circuit 20 are each connected to a control IC via a feedback circuit. If this feedback circuit is insulated by a photocoupler or the like, the LED circuit 10 and the LED circuit 20 are in an electrically floating state.

図３は、ＬＥＤ点灯装置の調光調色パターンの一例を示す図である。電球色のＬＥＤを有するＬＥＤ回路と、昼光色のＬＥＤを有するＬＥＤ回路の、２つのＬＥＤ回路を有するＬＥＤ点灯装置が、図３のような調光調色パターンを実現する場合、たとえば状態「１９」や状態「１１」の調整を行うためには、片方のＬＥＤを微少電流で点灯させる必要がある。   FIG. 3 is a diagram illustrating an example of a dimming toning pattern of the LED lighting device. When the LED lighting device having two LED circuits, that is, an LED circuit having a light bulb color LED and an LED circuit having a daylight color LED, realizes a dimming toning pattern as shown in FIG. In order to adjust the state “11”, it is necessary to light one LED with a small current.

図２に示した一般的なＬＥＤ点灯装置では、調光率が１％を切るような微少電流を流す場合、マイコンの出力や他回路の応答性、ノイズの影響などにより、制御が難しくなる。   In the general LED lighting device shown in FIG. 2, when a very small current is applied such that the dimming rate is less than 1%, control becomes difficult due to the output of the microcomputer, the response of other circuits, the influence of noise, and the like.

また、図２に示した一般的なＬＥＤ点灯装置のように、各ＬＥＤ回路に別々に電源が供給される場合、片方の色のＬＥＤ回路に定電流動作で十分な電流を流し、もう一方の色のＬＥＤ回路に定電流動作で微少電流を流すとすると、十分な電流を流すＬＥＤ回路では、発熱に伴ってＬＥＤで消費される電力が低下して明るさが低下する。これに対し、微少電流を流すＬＥＤ回路では発熱がほぼなく、ＬＥＤで消費される電力の低下を起こさないので、明るさは低下しない。このため、色の組み合わせのバランスが崩れて、色が変化してしまう。   In addition, as in the general LED lighting device shown in FIG. 2, when power is separately supplied to each LED circuit, a sufficient current is supplied to the LED circuit of one color by constant current operation, and the other one is supplied. If a very small current is passed through the color LED circuit by a constant current operation, the power consumed by the LED is reduced and the brightness is lowered in the LED circuit that passes a sufficient current. On the other hand, the LED circuit that passes a very small amount of heat does not generate heat, and the power consumed by the LED does not decrease, so the brightness does not decrease. For this reason, the balance of the color combination is lost and the color changes.

そこで、本実施の形態では、２つのＬＥＤ回路のうちＬＥＤを微少電流で点灯させるＬＥＤ回路のＬＥＤの両端を、スイッチ素子および電圧制限用素子を介して、他方のＬＥＤの両端に接続する。   Therefore, in this embodiment, both ends of the LED of the LED circuit that turns on the LED with a minute current of the two LED circuits are connected to both ends of the other LED via the switch element and the voltage limiting element.

図４は、実施の形態に係るＬＥＤ回路の一例を示す図である。図４では、抵抗ＲＳ１、抵抗ＲＳ２、コンデンサＣ１およびコンデンサＣ３およびＬＥＤのみを記載し、その他の構成については省略しているが、省略した部分の構成は図２と同様である。   FIG. 4 is a diagram illustrating an example of the LED circuit according to the embodiment. In FIG. 4, only the resistor RS1, the resistor RS2, the capacitor C1, the capacitor C3, and the LED are shown, and the other configurations are omitted, but the configuration of the omitted portions is the same as that of FIG.

ＬＥＤ回路３０のＬＥＤ群とＬＥＤ回路４０のＬＥＤ群とは、異なる色であって、本実施の形態のＬＥＤ点灯装置は、各ＬＥＤ回路のＬＥＤ群を流れる電流を変化させることによって、調光調色を行う。図４の例は、ＬＥＤ群は５個であるが、これに限らず何個でもよい。   The LED group of the LED circuit 30 and the LED group of the LED circuit 40 have different colors, and the LED lighting device according to the present embodiment changes the current flowing through the LED group of each LED circuit, thereby adjusting the light intensity. Do color. In the example of FIG. 4, the number of LED groups is five, but the number is not limited to this and may be any number.

図４の例では、ＬＥＤ回路４０のＬＥＤ群の両端を、スイッチ素子および電圧制限用素子ＳＲ１およびＳＲ２を介して、ＬＥＤ回路３０のＬＥＤ群の両端に接続する。スイッチ素子とはダイオード、トランジスタ、ＦＥＴ（Field Effect Transistor）などであり、電圧制限用素子とは抵抗、ツェナーダイオードなどである。   In the example of FIG. 4, both ends of the LED group of the LED circuit 40 are connected to both ends of the LED group of the LED circuit 30 via the switch element and the voltage limiting elements SR1 and SR2. The switch element is a diode, a transistor, an FET (Field Effect Transistor) or the like, and the voltage limiting element is a resistor, a zener diode or the like.

電圧制限用素子を設けることで、ＬＥＤ回路４０の動作が停止しているとき、ＬＥＤ回路４０のＬＥＤ群に流れる電流は、ＬＥＤ回路３０のＬＥＤ群に流れる電流よりも少なくなり、ＬＥＤ回路４０に微少電流を流すことができる。ＬＥＤ回路４０に流れる電流の量は、電圧制限用素子によって決定される。また、ＬＥＤ回路４０は、ＬＥＤ回路３０のＬＥＤ群の両端を電源としているので、ＬＥＤ回路３０のＬＥＤが発熱して電圧が低下すると、ＬＥＤ回路４０への電圧も連動して低下し、色の変化が少なくなる。   By providing the voltage limiting element, when the operation of the LED circuit 40 is stopped, the current flowing through the LED group of the LED circuit 40 is less than the current flowing through the LED group of the LED circuit 30, and the LED circuit 40 A minute current can flow. The amount of current flowing through the LED circuit 40 is determined by the voltage limiting element. In addition, since the LED circuit 40 uses both ends of the LED group of the LED circuit 30 as power sources, when the LED of the LED circuit 30 generates heat and the voltage decreases, the voltage to the LED circuit 40 also decreases in conjunction with the color of the LED circuit 30. Less change.

図５は、実施の形態に係るＬＥＤ回路の他の例を示す図である。図５に示すように、ＬＥＤ回路４０のＬＥＤ群の両端を、スイッチ素子および電圧制限用素子ＳＲ１およびＳＲ２を介して、ＬＥＤ回路３０のＬＥＤ群の両端に接続する際、ＬＥＤ群の途中に接続してもよい。   FIG. 5 is a diagram illustrating another example of the LED circuit according to the embodiment. As shown in FIG. 5, when both ends of the LED group of the LED circuit 40 are connected to both ends of the LED group of the LED circuit 30 via the switch element and the voltage limiting elements SR1 and SR2, they are connected in the middle of the LED group. May be.

図４の例ではＡＤ間にスイッチ素子および電圧制限用素子ＳＲ１、ＣＥ間にスイッチ素子および電圧制限用素子ＳＲ２、図５の例ではＨＤ間にスイッチ素子および電圧制限用素子ＳＲ１、ＣＥ間にスイッチ素子および電圧制限用素子ＳＲ２を設けているが、スイッチ素子および電圧制限用素子は少なくともどちらか一方に設ければよい。   In the example of FIG. 4, the switch element and the voltage limiting element SR1 between AD and the voltage limiting element SR2 between CE, and in the example of FIG. 5, the switch element and the voltage limiting element SR1 between CE and the switch between CE Although the element and the voltage limiting element SR2 are provided, the switch element and the voltage limiting element may be provided in at least one of them.

図６は、実施の形態に係るＬＥＤ回路の具体例を示す図である。図６の例では、ＨＤ間にスイッチ素子および電圧制限用素子を設けている。スイッチ素子はダイオードＤ５であって、電圧制限用素子は抵抗Ｒ５である。１つのＬＥＤに十分な電流を流したときの順方向電圧の値をＶｆとすると、ＬＥＤ回路４０のＬＥＤ回路が動作している場合、ＤＥ間には５＊Ｖｆの電位差が発生しているので、ＨＤ間の４＊Ｖｆよりも電圧が高くなる。したがって、ダイオードＤ５には逆方向に電圧がかかるためＬＥＤ回路３０から電流は流れない。   FIG. 6 is a diagram illustrating a specific example of the LED circuit according to the embodiment. In the example of FIG. 6, a switching element and a voltage limiting element are provided between the HDs. The switch element is a diode D5, and the voltage limiting element is a resistor R5. Assuming that the value of the forward voltage when a sufficient current flows through one LED is Vf, a potential difference of 5 * Vf is generated between DEs when the LED circuit of the LED circuit 40 is operating. The voltage becomes higher than 4 * Vf between HD. Therefore, since a voltage is applied to the diode D5 in the reverse direction, no current flows from the LED circuit 30.

ＬＥＤ回路４０のＬＥＤ回路の動作が停止すると、ＬＥＤ回路３０からダイオードＤ５と抵抗Ｒ５を経由してＬＥＤ回路４０のＬＥＤに電流が流れ始める。抵抗Ｒ５によって、ＬＥＤ回路４０のＬＥＤに流れる電流を微少電流にすることが可能となる。   When the operation of the LED circuit of the LED circuit 40 stops, a current starts to flow from the LED circuit 30 to the LED of the LED circuit 40 via the diode D5 and the resistor R5. The resistor R5 allows the current flowing through the LED of the LED circuit 40 to be a very small current.

図７は、実施の形態に係るＬＥＤ回路の他の具体例を示す図である。図６の構成に加え、ＣＥ間にトランジスタＱ３を設けている。トランジスタＱ３をデューティ比可変のパルス電圧等で駆動すると、調光が可能となり、明るさの幅が広がる。図７の例では、トランジスタＱ３は、ＦＥＴである。   FIG. 7 is a diagram illustrating another specific example of the LED circuit according to the embodiment. In addition to the configuration of FIG. 6, a transistor Q3 is provided between the CEs. When the transistor Q3 is driven with a pulse voltage having a variable duty ratio, etc., dimming is possible and the range of brightness is widened. In the example of FIG. 7, the transistor Q3 is an FET.

図７では、図６の構成に加えて、ＣＥ間にトランジスタＱ３を設けているが、図６の構成のダイオードＤ５に代えて、トランジスタＱ３を設けてもよい。   In FIG. 7, the transistor Q3 is provided between the CEs in addition to the configuration of FIG. 6, but a transistor Q3 may be provided instead of the diode D5 having the configuration of FIG.

図８は、実施の形態に係るＬＥＤ回路の他の具体例を示す図である。図６の構成に加え、コンデンサＣ３とＤ点の間にダイオードＤ７を設けている。微少電流で点灯させる際、ＬＥＤ回路３０からダイオードＤ５と抵抗Ｒ５を経由して流れてくる電流は、まずはコンデンサＣ３に充電されるので、点灯が遅れる。これを防ぐためにダイオードＤ７を追加し、コンデンサＣ３に充電しないようにしている。   FIG. 8 is a diagram illustrating another specific example of the LED circuit according to the embodiment. In addition to the configuration of FIG. 6, a diode D7 is provided between the capacitor C3 and the point D. When lighting with a very small current, the current flowing from the LED circuit 30 via the diode D5 and the resistor R5 is first charged in the capacitor C3, so that the lighting is delayed. In order to prevent this, a diode D7 is added so that the capacitor C3 is not charged.

ここまで、ＬＥＤ回路４０のＬＥＤのみを微少電流で点灯させる構成を説明した。しかしこれに限らず、ＬＥＤ回路３０のＬＥＤのみを微少電流で点灯可能にしてもよいし、ＬＥＤ回路３０およびＬＥＤ回路４０の両方のＬＥＤを微少電流で点灯可能にしてもよい。   So far, the configuration in which only the LED of the LED circuit 40 is turned on with a minute current has been described. However, the present invention is not limited to this, and only the LED of the LED circuit 30 may be lit with a very small current, or both the LED circuit 30 and the LED circuit 40 may be lit with a very small current.

図９は、実施の形態に係る両方のＬＥＤ回路のＬＥＤを微少電流で点灯させる場合のＬＥＤ回路の一例を示す図である。図７の構成に加え、ＡＧ間にスイッチ素子および電圧制限用素子を設け、ＢＦ間にトランジスタＱ４を設けている。トランジスタＱ４は、ＦＥＴであり、ゲート電圧の関係上、ＢＦ間に配置するのが望ましい。   FIG. 9 is a diagram illustrating an example of an LED circuit when the LEDs of both LED circuits according to the embodiment are lit with a minute current. In addition to the configuration of FIG. 7, a switch element and a voltage limiting element are provided between AG, and a transistor Q4 is provided between BF. The transistor Q4 is an FET, and is preferably disposed between the BFs due to the gate voltage.

１つのＬＥＤに十分な電流を流したときの順方向電圧の値をＶｆとすると、ＬＥＤ回路４０のＬＥＤ回路が動作している場合、ＤＥ間には５＊Ｖｆの電位差が発生しているので、ＨＢ間の４＊Ｖｆよりも電圧が高くなる。したがって、ダイオードＤ５には逆方向に電圧がかかるためＬＥＤ回路３０から電流は流れない。   Assuming that the value of the forward voltage when a sufficient current flows through one LED is Vf, a potential difference of 5 * Vf is generated between DEs when the LED circuit of the LED circuit 40 is operating. The voltage becomes higher than 4 * Vf between HB and HB. Therefore, since a voltage is applied to the diode D5 in the reverse direction, no current flows from the LED circuit 30.

ＬＥＤ回路４０のＬＥＤ回路の動作が停止すると、ＬＥＤ回路３０からダイオードＤ５と抵抗Ｒ５を経由してＬＥＤ回路４０のＬＥＤに電流が流れ始める。抵抗Ｒ５によって、ＬＥＤ回路４０のＬＥＤに流れる電流を微少電流にすることが可能となる。   When the operation of the LED circuit of the LED circuit 40 stops, a current starts to flow from the LED circuit 30 to the LED of the LED circuit 40 via the diode D5 and the resistor R5. The resistor R5 allows the current flowing through the LED of the LED circuit 40 to be a very small current.

一方、ＬＥＤ回路３０のＬＥＤ回路が動作している場合、ＡＢ間には５＊Ｖｆの電位差が発生しているので、ＧＥ間の２＊Ｖｆよりも電圧が高くなる。したがって、ダイオードＤ６には逆方向に電圧がかかるためＬＥＤ回路３０から電流は流れない。   On the other hand, when the LED circuit of the LED circuit 30 is operating, since a potential difference of 5 * Vf is generated between AB, the voltage is higher than 2 * Vf between GEs. Therefore, since a voltage is applied to the diode D6 in the reverse direction, no current flows from the LED circuit 30.

ＬＥＤ回路３０のＬＥＤ回路の動作が停止すると、ＬＥＤ回路４０からダイオードＤ５と抵抗Ｒ５を経由してＬＥＤ回路３０のＬＥＤに電流が流れ始める。抵抗Ｒ６によって、ＬＥＤ回路３０のＬＥＤに流れる電流を微少電流にすることが可能となる。   When the operation of the LED circuit of the LED circuit 30 stops, a current starts to flow from the LED circuit 40 to the LED of the LED circuit 30 via the diode D5 and the resistor R5. The current flowing through the LED of the LED circuit 30 can be reduced to a very small amount by the resistor R6.

また、トランジスタＱ３およびトランジスタＱ４がデューティ比可変のパルス電圧等で駆動することにより、調光が可能となり、明るさの幅が広がる。   Further, by driving the transistor Q3 and the transistor Q4 with a pulse voltage having a variable duty ratio, dimming can be performed and the range of brightness is widened.

本実施の形態のＬＥＤ点灯装置によれば、２以上のＬＥＤ回路を用いてＬＥＤを点灯させて調光調色を行う際、微少電流領域の電流を流すことができ、かつ、一部のＬＥＤ回路のＬＥＤの発熱により起こる可能性がある組み合わせの色の変化を最小限に抑えることができる。また、定電圧源を別途用意する必要がないため、コスト、部品点数についても利点がある。   According to the LED lighting device of the present embodiment, when dimming toning by turning on an LED using two or more LED circuits, a current in a minute current region can be passed, and some LEDs Combination color changes that can occur due to the heat generated by the LEDs of the circuit can be minimized. Further, since there is no need to prepare a constant voltage source separately, there are advantages in terms of cost and the number of parts.

上記の実施の形態では、ＬＥＤ回路として、フライバック回路を例に説明したが、その他の定電流回路を用いてもよい。また、本発明の適用はＬＥＤ回路に限らず、有機ＥＬなどの半導体発光素子の点灯回路に用いることができる。   In the above embodiment, the flyback circuit has been described as an example of the LED circuit, but other constant current circuits may be used. The application of the present invention is not limited to the LED circuit, and can be used for a lighting circuit of a semiconductor light emitting element such as an organic EL.

また、上記の実施の形態では、２つのＬＥＤ回路を備えるＬＥＤ点灯装置を説明したが、３つ以上のＬＥＤ回路を備えてもよい。   Moreover, in said embodiment, although the LED lighting device provided with two LED circuits was demonstrated, you may provide three or more LED circuits.

上記の実施形態の一部または全部は、以下の請求項のようにも記載されうるが、以下には限られない。   Part or all of the above embodiments can be described as in the following claims, but are not limited thereto.

（付記１）
第１のＬＥＤ回路と、前記第１のＬＥＤ回路のＬＥＤと異なる色のＬＥＤを有する第２のＬＥＤ回路とを備え、調光調色を行うＬＥＤ点灯装置であって、
前記第１のＬＥＤ回路のＬＥＤの両端が、スイッチ素子および電圧制限用素子を介して、前記第２のＬＥＤ回路のＬＥＤの両端に直接、または、抵抗を挟んで接続されており、前記第１のＬＥＤ回路は前記第２のＬＥＤ回路から電源を受給することを特徴とするＬＥＤ点灯装置。 (Appendix 1)
An LED lighting device that includes a first LED circuit and a second LED circuit having an LED of a different color from the LED of the first LED circuit, and performs dimming and toning,
Both ends of the LED of the first LED circuit are connected directly or both ends of the LED of the second LED circuit via a switch element and a voltage limiting element, with the resistor interposed therebetween. The LED circuit is characterized in that it receives power from the second LED circuit.

（付記２）
前記第１のＬＥＤ回路および前記第２のＬＥＤ回路は、２以上のＬＥＤを有し、前記第１のＬＥＤ回路の少なくとも１つのＬＥＤの両端は、前記スイッチ素子および前記電圧制限用素子を介して、前記第２のＬＥＤ回路の少なくとも１つのＬＥＤの両端に直接、または、抵抗を挟んで接続されることを特徴とする付記１に記載のＬＥＤ点灯装置。 (Appendix 2)
The first LED circuit and the second LED circuit have two or more LEDs, and both ends of at least one LED of the first LED circuit are connected via the switch element and the voltage limiting element. The LED lighting device according to appendix 1, wherein the LED lighting device is connected directly or across a resistor to at least one LED of the second LED circuit.

（付記３）
前記第１のＬＥＤ回路は、デューティ比を変更可能なスイッチ素子を備えることを特徴とする付記１または２に記載のＬＥＤ点灯装置。 (Appendix 3)
The LED lighting device according to appendix 1 or 2, wherein the first LED circuit includes a switch element capable of changing a duty ratio.

（付記４）
前記第１のＬＥＤ回路は、ＬＥＤと並列に接続されるコンデンサを備え、前記第２のＬＥＤ回路の電源を供給する前記接続点と前記コンデンサとの間にダイオードを備えることを特徴とする付記１ないし３のいずれかに記載のＬＥＤ点灯装置。 (Appendix 4)
The first LED circuit includes a capacitor connected in parallel with the LED, and includes a diode between the capacitor and the connection point that supplies power to the second LED circuit. The LED lighting device in any one of thru | or 3.

１０、２０、３０、４０ ＬＥＤ回路
Ｃ１、Ｃ３ コンデンサ
Ｄ５、Ｄ６、Ｄ７ ダイオード
Ｑ３、Ｑ４ トランジスタ
ＲＳ１、ＲＳ２、Ｒ５、Ｒ６ 抵抗
ＳＲ１、ＳＲ２ スイッチ素子および電圧制限用素子 10, 20, 30, 40 LED circuit
C1, C3 capacitors
D5, D6, D7 Diode
Q3, Q4 Transistors RS1, RS2, R5, R6 Resistance
SR1, SR2 switch element and voltage limiting element

Claims (4)

第１のＬＥＤ回路と、前記第１のＬＥＤ回路のＬＥＤと異なる色のＬＥＤを有する第２のＬＥＤ回路とを備え、調光調色を行うＬＥＤ点灯装置であって、
前記第１のＬＥＤ回路のＬＥＤの両端が、スイッチ素子および電圧制限用素子を介して、前記第２のＬＥＤ回路のＬＥＤの両端に直接、または、抵抗を挟んで接続されており、前記第１のＬＥＤ回路は前記第２のＬＥＤ回路から電源を受給することを特徴とするＬＥＤ点灯装置。 An LED lighting device that includes a first LED circuit and a second LED circuit having an LED of a different color from the LED of the first LED circuit, and performs dimming and toning,
Both ends of the LED of the first LED circuit are connected directly or both ends of the LED of the second LED circuit via a switch element and a voltage limiting element, with the resistor interposed therebetween. The LED circuit is characterized in that it receives power from the second LED circuit. 前記第１のＬＥＤ回路および前記第２のＬＥＤ回路は、２以上のＬＥＤを有し、前記第１のＬＥＤ回路の少なくとも１つのＬＥＤの両端は、前記スイッチ素子および前記電圧制限用素子を介して、前記第２のＬＥＤ回路の少なくとも１つのＬＥＤの両端に直接、または、抵抗を挟んで接続されることを特徴とする請求項１に記載のＬＥＤ点灯装置。   The first LED circuit and the second LED circuit have two or more LEDs, and both ends of at least one LED of the first LED circuit are connected via the switch element and the voltage limiting element. 2. The LED lighting device according to claim 1, wherein the LED lighting device is connected to both ends of at least one LED of the second LED circuit directly or across a resistor. 前記第１のＬＥＤ回路のＬＥＤのカソードは、前記第２のＬＥＤ回路のＬＥＤのカソードに、デューティ比を変更可能なスイッチ素子を介して接続されることを特徴とする請求項１または２に記載のＬＥＤ点灯装置。 The cathode of LED of the first LED circuit, according to the cathode of the LED of the second LED circuit in claim 1 or 2, characterized in Rukoto are connected via a changeable switch element the duty ratio LED lighting device. 前記第１のＬＥＤ回路は、ＬＥＤと並列に接続されるコンデンサを備え、前記第２のＬＥＤ回路の電源を供給する接続点と前記コンデンサとの間にダイオードを備えることを特徴とする請求項１ないし３のいずれか１項に記載のＬＥＤ点灯装置。 According the first LED circuit that includes a capacitor connected in parallel with the LED, characterized in that it comprises a diode between said second power supply the capacitor and the attachment point you supply the LED circuit Item 4. The LED lighting device according to any one of Items 1 to 3.
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