JP2012094811A - Led light-emitting device - Google Patents

Led light-emitting device Download PDF

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JP2012094811A
JP2012094811A JP2011122174A JP2011122174A JP2012094811A JP 2012094811 A JP2012094811 A JP 2012094811A JP 2011122174 A JP2011122174 A JP 2011122174A JP 2011122174 A JP2011122174 A JP 2011122174A JP 2012094811 A JP2012094811 A JP 2012094811A
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led
terminal
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Ritsu Takeda
立 武田
Shinji Takai
真二 鷹居
Hiroaki Sakuta
寛明 作田
Yoshito Sato
義人 佐藤
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Mitsubishi Chemical Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a protection circuit of an LED circuit, which is capable of protecting LEDs from a high reverse current.SOLUTION: An LED light-emitting device includes: a two-terminal LED circuit including a first LED and a second LED which are connected in parallel with their polarities reversed; and two two-terminal protection circuits which each includes a zener diode and a diode connected in series with the zener diode in reverse polarity and are connected in parallel to the two-terminal LED circuit in connecting directions different from each other.

Description

本発明は、ＬＥＤ発光装置に関する。   The present invention relates to an LED light emitting device.

近年、白熱電球や蛍光灯に代わる照明機器として、発光ダイオード（ＬＥＤ（Light Emitting Diode））を用いたＬＥＤ照明器が普及しつつある。ＬＥＤはダイオードであるため、電流が順方向に流れる場合に発光し、逆方向に流れる場合には発光しない。このため、ＬＥＤを商用電源のような交流電源からの電力を用いて駆動させる場合には、整流器を用いて交流電源からの交流電流を直流電流に変換し、ＬＥＤに供給している。   In recent years, LED illuminators using light emitting diodes (LEDs) have become widespread as illumination devices that replace incandescent bulbs and fluorescent lamps. Since the LED is a diode, it emits light when current flows in the forward direction and does not emit light when it flows in the reverse direction. For this reason, when driving LED using the electric power from alternating current power supplies, such as a commercial power supply, the alternating current from alternating current power supply is converted into direct current using a rectifier, and it supplies to LED.

これに対し、交流源からの交流を直接的にＬＥＤに供給してＬＥＤを駆動させるＬＥＤ駆動回路がある。例えば、特許文献１には、交流源に対して極性を逆にして並列接続された二つのＬＥＤ群に関して、交流の正の半サイクルにおいてはＬＥＤ群の一方が駆動し、交流の負の半サイクルにおいてはＬＥＤ群の他方が駆動するように、ＬＥＤ群に交流電流を供給する技術が開示されている。   On the other hand, there is an LED drive circuit that drives an LED by directly supplying an alternating current from an alternating current source to the LED. For example, in Patent Document 1, regarding two LED groups connected in parallel with opposite polarity with respect to an AC source, one of the LED groups is driven in an AC positive half cycle, and an AC negative half cycle. Discloses a technique for supplying an alternating current to the LED group so that the other of the LED group is driven.

特開２００８−２６３２０３号公報（図２）JP 2008-263203 A (FIG. 2)

しかしながら、上述したような、二つのＬＥＤ群が交流により駆動されるＬＥＤ駆動回路では、ＬＥＤ群の夫々に対し、交流の正負の半サイクルの一方において、逆方向バイアスがかけられる（アノード側に負電圧が印加される）。このような逆方向バイアス時に、何らかの理由によって、定格を超える電圧又は電流が生じると、ＬＥＤ群が破損する虞があった。   However, in the LED driving circuit in which the two LED groups are driven by alternating current as described above, a reverse bias is applied to each of the LED groups in one of the positive and negative half cycles of the alternating current (negative on the anode side). Voltage is applied). During such a reverse bias, if a voltage or current exceeding the rating is generated for some reason, the LED group may be damaged.

本発明は、逆方向バイアス時の定格を超える電圧や電流からＬＥＤを保護可能な技術を提供することを目的とする。   An object of this invention is to provide the technique which can protect LED from the voltage and electric current exceeding the rating at the time of reverse bias.

本発明は、上記目的を達成するため、以下の手段を採用する。すなわち、本発明の第１の態様は、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤを含む二端子ＬＥＤ回路と、ツェナーダイオードとこのツェナーダイオードに逆極性で直列接続されたダイオードとをそれぞれ含み、相互に異なる接続方向で前記二端子ＬＥＤ回路に並列接続される２つの二端子保護回路と、を含むＬＥＤ発光装置である。   In order to achieve the above object, the present invention employs the following means. That is, the first aspect of the present invention includes a two-terminal LED circuit including a first LED and a second LED connected in parallel with opposite polarities, a Zener diode, and a diode connected in series to the Zener diode with a reverse polarity. Each of the LED light-emitting devices includes two two-terminal protection circuits that are respectively included and connected in parallel to the two-terminal LED circuit in different connection directions.

本発明の第１の態様によれば、ＬＥＤ二端子回路が有する二つの端子間の一方に交流電流が供給されると、交流の正の半サイクルにおいて第１ＬＥＤ及び第２ＬＥＤの一方に電流が流れる一方で、負の半サイクルにおいて第１ＬＥＤ及び第２ＬＥＤの他方に電流が流れる。これによって、第１ＬＥＤ及び第２ＬＥＤが正負の半サイクル毎に点灯することができる。第１ＬＥＤ及び第２ＬＥＤは、点灯用の電流が流れない正負の半サイクルの一方では、逆バイアスがかかった状態となる。このような、逆バイアス状態において、定格を超える電圧や電流が発生すると、逆バイアス状態の第１ＬＥＤ又は第２ＬＥＤが破損する虞がある。これに対し、本発明の第１態様では、二端子保護回路が並列接続されているので、正負のサイクルの夫々において、第１又は第２ＬＥＤに対する逆方向の定格を超える
電圧が生じた場合には、ツェナーダイオードのいずれか一方が降伏することで、第１又は第２ＬＥＤの破損を防止することができる。 According to the first aspect of the present invention, when an alternating current is supplied to one of the two terminals of the LED two-terminal circuit, a current flows to one of the first LED and the second LED in the positive half cycle of the alternating current. On the other hand, current flows through the other of the first LED and the second LED in the negative half cycle. Thereby, 1st LED and 2nd LED can be lighted for every positive / negative half cycle. The first LED and the second LED are in a state of being reverse-biased in one of positive and negative half cycles in which no lighting current flows. In such a reverse bias state, if a voltage or current exceeding the rating is generated, the first LED or the second LED in the reverse bias state may be damaged. On the other hand, in the first aspect of the present invention, since the two-terminal protection circuit is connected in parallel, when a voltage exceeding the reverse rating for the first or second LED occurs in each of the positive and negative cycles. The breakdown of the first or second LED can be prevented by the breakdown of one of the Zener diodes.

本発明の第２の態様は、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤを含むＬＥＤ二端子回路と、
極性を逆にして直列接続された２つのツェナーダイオードを含み、前記ＬＥＤ二端子保護回路に並列接続される二端子保護回路と、
を含むＬＥＤ発光装置である。 According to a second aspect of the present invention, there is provided an LED two-terminal circuit including a first LED and a second LED connected in parallel with opposite polarities,
A two-terminal protection circuit including two Zener diodes connected in series with opposite polarities and connected in parallel to the LED two-terminal protection circuit;
It is an LED light-emitting device containing this.

本発明の第２の態様は、前記二端子ＬＥＤ回路が、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤが複数直列接続されてなるようにしても良い。或いは、前記二端子ＬＥＤ回路は、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤが複数並列接続されてなるようにしても良い。   In the second aspect of the present invention, the two-terminal LED circuit may be formed by connecting a plurality of first LEDs and a plurality of second LEDs connected in parallel with opposite polarities. Alternatively, the two-terminal LED circuit may be configured such that a plurality of first LEDs and second LEDs connected in parallel with opposite polarities are connected in parallel.

第２の態様においても、第１の態様とほぼ同様の作用効果を得ることができる。   Also in the second aspect, it is possible to obtain substantially the same operational effects as in the first aspect.

第１及び第２の態様における第１ＬＥＤ及び第２ＬＥＤは、単一のＬＥＤ素子（ＬＥＤセル）又は直列接続された複数のＬＥＤ素子で構成可能である。また、二端子ＬＥＤ回路は、第１ＬＥＤ及び第２ＬＥＤが並列接続された並列回路が複数個直列接続されることによって構成されていても良い。   The first LED and the second LED in the first and second aspects can be configured by a single LED element (LED cell) or a plurality of LED elements connected in series. The two-terminal LED circuit may be configured by connecting a plurality of parallel circuits in which the first LED and the second LED are connected in parallel.

また、第１ＬＥＤ及び第２ＬＥＤは、夫々個別のＬＥＤチップをなすものであってもよく、第１及び第２ＬＥＤが１チップ化されたものであってもよい。また、第１及び第２ＬＥＤが含まれるＬＥＤモジュール，ＬＥＤパッケージも、本発明に係る「二端子ＬＥＤ回路」に含まれ得る。   Further, the first LED and the second LED may each be an individual LED chip, or the first LED and the second LED may be integrated into one chip. Moreover, the LED module and LED package including the first and second LEDs can also be included in the “two-terminal LED circuit” according to the present invention.

本発明によれば、逆方向バイアス時の定格を超える電圧や電流からＬＥＤを保護することができる。   According to the present invention, the LED can be protected from a voltage or current exceeding the rating at the time of reverse bias.

図１（Ａ）及び（Ｂ）は、保護回路を含むＬＥＤ回路（ＬＥＤ発光装置）の実施形態における構成例を示す図である。1A and 1B are diagrams illustrating a configuration example in an embodiment of an LED circuit (LED light emitting device) including a protection circuit. 図２（Ａ）及び（Ｂ）は、保護回路を含むＬＥＤ回路（ＬＥＤ発光装置）の他の実施形態における構成例を示す図である。FIGS. 2A and 2B are diagrams illustrating a configuration example in another embodiment of an LED circuit (LED light-emitting device) including a protection circuit.

以下、図面を参照して本発明の実施形態について説明する。実施形態の構成は例示であり、本発明は実施形態の構成に限定されない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the embodiment is an exemplification, and the present invention is not limited to the configuration of the embodiment.

図１（Ａ）は、一態様に係る保護回路を含むＬＥＤ回路（ＬＥＤ発光装置）の構成例を模式的に示し、図１（Ｂ）は、他の態様に係るＬＥＤ回路（ＬＥＤ発光装置）の構成例を模式的に示す。   FIG. 1A schematically illustrates a configuration example of an LED circuit (LED light-emitting device) including a protection circuit according to one embodiment, and FIG. 1B illustrates an LED circuit (LED light-emitting device) according to another embodiment. An example of the configuration is schematically shown.

図１（Ａ）において、ＬＥＤ回路（ＬＥＤ発光装置）１００は、二つの端子１０１、１０２と、二つの端子１０１、１０２間に極性を逆にして並列接続された第１ＬＥＤ群１０３（第１ＬＥＤに相当）と、第２ＬＥＤ群１０４（第２ＬＥＤに相当）とを備えている。第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４とで、ＬＥＤ発光部を構成する。このような極性を逆にして並列接続された第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４に端子１０１，１０２を接続したものが、本発明における「二端子ＬＥＤ回路」に相当する。   In FIG. 1A, an LED circuit (LED light emitting device) 100 includes two terminals 101 and 102, and a first LED group 103 (into the first LEDs) connected in parallel between the two terminals 101 and 102 with the polarities reversed. And a second LED group 104 (corresponding to a second LED). The first LED group 103 and the second LED group 104 constitute an LED light emitting unit. A device in which the terminals 101 and 102 are connected to the first LED group 103 and the second LED group 104 connected in parallel with the polarity reversed is equivalent to the “two-terminal LED circuit” in the present invention.

第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４の夫々は、直列接続された１以上の所定数のＬＥＤ素子からなる。第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４を構成するＬＥＤ素子の数は適宜設定可能である。また、第１及び第２ＬＥＤ群１０３、１０４を構成するＬＥＤ素子の数が同数であることは必須の要件ではなく、第１及び第２ＬＥＤ群１０３，１０４の夫々は、所望数のＬＥＤ素子から構成することができる。   Each of the first LED group 103 and the second LED group 104 includes one or more predetermined numbers of LED elements connected in series. The number of LED elements constituting the first LED group 103 and the second LED group 104 can be set as appropriate. In addition, it is not an essential requirement that the number of LED elements constituting the first and second LED groups 103 and 104 is the same, and each of the first and second LED groups 103 and 104 is composed of a desired number of LED elements. can do.

ＬＥＤ回路１００は、端子１０１，１０２間に交流電流が供給された場合に、第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４の一方（例えば第１ＬＥＤ群１０３）が交流電流の正の半サイクルで発光し、他方（例えば第２ＬＥＤ群１０４）が負の半サイクルで発光する。このように、ＬＥＤ回路１００は、交流源からの交流電流で駆動させることができる。   In the LED circuit 100, when an alternating current is supplied between the terminals 101 and 102, one of the first LED group 103 and the second LED group 104 (for example, the first LED group 103) emits light in a positive half cycle of the alternating current, The other (for example, the second LED group 104) emits light in a negative half cycle. Thus, the LED circuit 100 can be driven by an alternating current from an alternating current source.

第１ＬＥＤ群１０３と第２ＬＥＤ群１０４とは、同一の発光特性を有していても良い。或いは、第１及び第２ＬＥＤ群１０３，１０４は、異なるスペクトル特性を有し、色温度や色（発光波長域）が異なっていても良い。   The first LED group 103 and the second LED group 104 may have the same light emission characteristics. Alternatively, the first and second LED groups 103 and 104 may have different spectral characteristics and may have different color temperatures and colors (light emission wavelength ranges).

例えば、第１ＬＥＤ群１０３と第２ＬＥＤ群１０４とが、夫々白色を発する白色光源であり、両者の色温度が異なる場合には、正負の各サイクルで第１及び第２ＬＥＤ群１０３，１０４に供給される駆動電流（平均電流）の合計値の大きさを増減することで、ＬＥＤ発光部の輝度を調整できる。また、第１及び第２ＬＥＤ群１０３，１０４への駆動電流（平均電流）の比を変えることで、ＬＥＤ発光部の発光の色温度を変えることができる。これにより、白色光の色温度を例えば電球色から昼白色の広範囲に亘って変えることができる。第１ＬＥＤ群１０３と第２ＬＥＤ群１０４の発光色は白色以外の色であっても良い。このように、ＬＥＤ回路１００は、発光色の輝度，発光スペクトル，色度（色相、色温度）をシームレスに変更できるＬＥＤ発光装置を構成することができる。   For example, when the first LED group 103 and the second LED group 104 are white light sources that emit white light and the color temperatures of the two are different, they are supplied to the first and second LED groups 103 and 104 in each positive and negative cycle. The luminance of the LED light emitting unit can be adjusted by increasing or decreasing the total value of the drive current (average current). Further, by changing the ratio of the drive current (average current) to the first and second LED groups 103 and 104, it is possible to change the color temperature of light emission of the LED light emitting unit. Thereby, the color temperature of white light can be changed over a wide range, for example, from a light bulb color to daylight white. The emission color of the first LED group 103 and the second LED group 104 may be a color other than white. Thus, the LED circuit 100 can constitute an LED light-emitting device that can seamlessly change the luminance, emission spectrum, and chromaticity (hue, color temperature) of the emission color.

ＬＥＤ回路１００は、さらに、端子１０１，１０２間で第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４に対して並列接続された第１の保護回路１０５（第１の二端子保護回路に相当）、及び第２の保護回路１０６（第２の二端子保護回路に相当）を含んでいる。保護回路１０５は、アノード同士が連結されたツェナーダイオード１０７とダイオード１０８とを含み、第１及び第２ＬＥＤ群１０３、１０４（二端子ＬＥＤ回路）に対して並列接続されている。一方、保護回路１０６は、カソード同士が連結されたツェナーダイオード１０９及びダイオード１１０を含み、第１及び第２ＬＥＤ群１０３、１０４（二端子ＬＥＤ回路）に対して並列接続されている。   The LED circuit 100 further includes a first protection circuit 105 (corresponding to a first two-terminal protection circuit) connected in parallel to the first LED group 103 and the second LED group 104 between the terminals 101 and 102, and a second Protection circuit 106 (corresponding to a second two-terminal protection circuit). The protection circuit 105 includes a Zener diode 107 and a diode 108 whose anodes are connected to each other, and are connected in parallel to the first and second LED groups 103 and 104 (two-terminal LED circuit). On the other hand, the protection circuit 106 includes a Zener diode 109 and a diode 110 whose cathodes are connected to each other, and is connected in parallel to the first and second LED groups 103 and 104 (two-terminal LED circuit).

上記構成によれば、端子１０１から端子１０２へ向けて正の電流が流れるとき、第１ＬＥＤ群１０３には逆方向バイアスがかかる状態となる。この逆方向バイアス時に、ＬＥＤの定格を超える電圧や電流が生じると、第１ＬＥＤ群１０３が破損する可能性がある。これは、端子１０２から端子１０１へ向けて正の電流が流れる（第２ＬＥＤ群１０４に逆方向バイアスがかかる）ときに、第２ＬＥＤ群１０４についても起こり得る。   According to the above configuration, when a positive current flows from the terminal 101 toward the terminal 102, the first LED group 103 is in a reverse bias state. If a voltage or current exceeding the rating of the LED is generated during the reverse bias, the first LED group 103 may be damaged. This can also occur for the second LED group 104 when a positive current flows from the terminal 102 toward the terminal 101 (a reverse bias is applied to the second LED group 104).

これに対し、ＬＥＤ回路１００では、ツェナーダイオード１０７のツェナー電圧を超える、第１ＬＥＤ群１０３への逆方向バイアス電圧が発生すると、ツェナーダイオード１０７が降伏し、電流を端子１０２側へ流す。ツェナー電圧は、第１ＬＥＤ群１０３の定格電圧より低い。これによって、第１ＬＥＤ群１０３に対してその定格を超える逆方向バイアス電圧が印加されて第１ＬＥＤ群１０３が破損するのを防止することができる。   On the other hand, in the LED circuit 100, when a reverse bias voltage to the first LED group 103 that exceeds the Zener voltage of the Zener diode 107 is generated, the Zener diode 107 breaks down and current flows to the terminal 102 side. The Zener voltage is lower than the rated voltage of the first LED group 103. Thereby, it is possible to prevent the first LED group 103 from being damaged by applying a reverse bias voltage exceeding the rating to the first LED group 103.

逆に、ツェナーダイオード１０９のツェナー電圧を超える、第２ＬＥＤ群１０４への逆方向バイアス電圧が発生すると、保護回路１０６のツェナーダイオード１０９が降伏して電流を端子１０１側へ流す。これによって、第２ＬＥＤ群１０４に対してその定格を超え
る逆方向バイアス電圧が印加されて第２ＬＥＤ群１０４が破損することを防止することができる。 Conversely, when a reverse bias voltage to the second LED group 104 that exceeds the Zener voltage of the Zener diode 109 is generated, the Zener diode 109 of the protection circuit 106 breaks down and causes a current to flow to the terminal 101 side. Accordingly, it is possible to prevent the second LED group 104 from being damaged by applying a reverse bias voltage exceeding the rating to the second LED group 104.

図１（Ｂ）は、ＬＥＤ回路の他の態様（保護回路付きＬＥＤ回路（ＬＥＤ発光装置）１００Ａ）を示す。図１（Ｂ）に示す保護回路１１１（二端子保護回路に相当）は、図１（Ａ）に示す保護回路１０５及び１０６の等価回路である。保護回路１１１は、カソード同士が連結された（極性を逆にして直列接続された）二つのツェナーダイオード１１２，１１３からなる直列回路で形成されており、端子１０１、１０２間において、第１ＬＥＤ群１０３及び第２ＬＥＤ群１０４（二端子ＬＥＤ回路）に対して並列接続されている。但し、連結される二つのツェナーダイオード１１２，１１３の向きは逆であってもよい（アノード同士が連結されても良い）。   FIG. 1B shows another embodiment of the LED circuit (LED circuit with protection circuit (LED light emitting device) 100A). A protection circuit 111 (corresponding to a two-terminal protection circuit) illustrated in FIG. 1B is an equivalent circuit of the protection circuits 105 and 106 illustrated in FIG. The protection circuit 111 is formed of a series circuit including two Zener diodes 112 and 113 in which cathodes are connected (in series with opposite polarities), and between the terminals 101 and 102, the first LED group 103 is formed. The second LED group 104 (two-terminal LED circuit) is connected in parallel. However, the directions of the two Zener diodes 112 and 113 to be connected may be reversed (the anodes may be connected to each other).

図１（Ｂ）に示すＬＥＤ回路１００Ａによれば、端子１０１側からの大電圧（第１ＬＥＤ群１０３の定格を超える逆方向バイアス電圧）に対しては、ツェナーダイオード１１３が降伏することで、第１ＬＥＤ群１０３を保護することができる。一方、端子１０２側からの大電圧（第２ＬＥＤ群１０４の定格を超える逆方向バイアス電圧）に対しては、ツェナーダイオード１１２が降伏することで、第２ＬＥＤ群１０４を保護することができる。   According to the LED circuit 100A shown in FIG. 1B, the Zener diode 113 breaks down with respect to a large voltage from the terminal 101 side (reverse bias voltage exceeding the rating of the first LED group 103). One LED group 103 can be protected. On the other hand, the second LED group 104 can be protected by the breakdown of the Zener diode 112 against a large voltage from the terminal 102 side (reverse bias voltage exceeding the rating of the second LED group 104).

図２（Ａ）及び（Ｂ）は、図１に示した保護回路１１１を適用したＬＥＤ回路（ＬＥＤ発光装置）の例を示し、回路構成の異なるＬＥＤ回路１００Ｂ，１００Ｃ（それぞれ二端子ＬＥＤ回路に相当）に対し、保護回路１１１を適用した例が図示されている。   2A and 2B show an example of an LED circuit (LED light emitting device) to which the protection circuit 111 shown in FIG. 1 is applied, and LED circuits 100B and 100C having different circuit configurations (each a two-terminal LED circuit). An example in which the protection circuit 111 is applied is shown.

ＬＥＤ回路１００Ｂは、一対の端子１０１、１０２間において、並列接続された第１ＬＥＤ１２２と第２ＬＥＤ１２３とからなるＬＥＤ並列回路１２１が複数個直列接続されてなる。第１ＬＥＤ１２２及び第２ＬＥＤ１２３の夫々は、少なくとも１つのＬＥＤ素子を含む。第１ＬＥＤ１２２及び第２ＬＥＤ１２３の構成は、第１ＬＥＤ群１０３、第２ＬＥＤ群１０４の構成を適用することが可能である。保護回路１１１は、直列接続された複数のＬＥＤ並列回路１２１（二端子ＬＥＤ回路）に対して並列接続される。   The LED circuit 100 </ b> B is formed by connecting a plurality of LED parallel circuits 121 including a first LED 122 and a second LED 123 connected in parallel between a pair of terminals 101 and 102. Each of the first LED 122 and the second LED 123 includes at least one LED element. The configuration of the first LED group 103 and the second LED group 104 can be applied to the configuration of the first LED 122 and the second LED 123. The protection circuit 111 is connected in parallel to a plurality of LED parallel circuits 121 (two-terminal LED circuits) connected in series.

ＬＥＤ回路１００Ｂによれば、端子１０１から端子１０２へ向けてＬＥＤの定格を超える電圧が生じた場合に、ツェナーダイオード１１３が降伏することによって、第１ＬＥＤ１２２が保護される。逆に、端子１０２から端子１０１へ向けてＬＥＤの定格を超える電圧が生じた場合には、ツェナーダイオード１１２が降伏することによって、各第２ＬＥＤ１２３の破損が防止される。   According to the LED circuit 100B, when a voltage exceeding the rating of the LED is generated from the terminal 101 to the terminal 102, the first LED 122 is protected by the breakdown of the Zener diode 113. On the contrary, when a voltage exceeding the rating of the LED is generated from the terminal 102 toward the terminal 101, the Zener diode 112 breaks down, thereby preventing the second LED 123 from being damaged.

図２（Ｂ）に示すＬＥＤ回路１００Ｃは、複数の（２以上の）第１ＬＥＤ１２２と、複数の（２以上の）第２ＬＥＤ１２３とが並列接続されたＬＥＤ並列回路１２４がＬＥＤ並列回路１２１の代わりに適用されている点で、ＬＥＤ回路１００Ｂと異なる。その他の点は、ＬＥＤ回路１００Ｂと同じであるので、詳細な説明は省略する。なお、ツェナーダイオード１１２、１２３は、各ＬＥＤ並列回路１２１、１２４に対して個別に設けられていても良い。また、ＬＥＤ回路１００Ｂ、１００Ｃに対して保護回路１１１を適用した例を示したが、ＬＥＤ回路１００Ｂ、１００Ｃに対して保護回路１０５，１０６が適用されていても良い。   An LED circuit 100C illustrated in FIG. 2B includes an LED parallel circuit 124 in which a plurality of (two or more) first LEDs 122 and a plurality of (two or more) second LEDs 123 are connected in parallel, instead of the LED parallel circuit 121. It is different from the LED circuit 100B in that it is applied. Since the other points are the same as those of the LED circuit 100B, detailed description thereof is omitted. Note that the Zener diodes 112 and 123 may be individually provided for the LED parallel circuits 121 and 124. Moreover, although the protection circuit 111 was applied to the LED circuits 100B and 100C, the protection circuits 105 and 106 may be applied to the LED circuits 100B and 100C.

ＬＥＤ装置１００，１００Ａ，１００Ｂ，１００Ｃによれば、保護回路１０５及び１０６又は保護回路１１１が設けられていることで、端子１０１と端子１０２との間に、第１ＬＥＤ群１０３（第１ＬＥＤ１２２）及び第２ＬＥＤ群１０４（第２ＬＥＤ１２３）の一方に対して定格を超える逆方向バイアス電圧が発生した場合にも、ツェナーダイオードの降伏によって第１ＬＥＤ群１０３（第１ＬＥＤ１２２）及び第２ＬＥＤ群１０４（第２ＬＥＤ１２３）を保護し、これらの破損を防止することができる。   According to the LED devices 100, 100A, 100B, and 100C, the protection circuits 105 and 106 or the protection circuit 111 is provided, so that the first LED group 103 (first LED 122) and the first LED are disposed between the terminal 101 and the terminal 102. Even when a reverse bias voltage exceeding the rating is generated for one of the two LED groups 104 (second LED 123), the first LED group 103 (first LED 122) and the second LED group 104 (second LED 123) are protected by the breakdown of the Zener diode. These damages can be prevented.

図１及び図２に示した例では、ＬＥＤ回路と保護回路とが一体となった保護回路付きＬＥＤ回路を模式的に示したが、ＬＥＤ回路と保護回路とは物理的に別体（チップ、パッケージ、モジュールなど）で形成され、必要に応じて保護回路がＬＥＤ回路に接続されるようになっていても良い。   In the example shown in FIGS. 1 and 2, the LED circuit with the protection circuit in which the LED circuit and the protection circuit are integrated is schematically shown. However, the LED circuit and the protection circuit are physically separated (chip, And a protection circuit may be connected to the LED circuit as necessary.

なお、ＬＥＤ回路１００，１００Ａ，１００Ｂ，１００Ｃにおいて、端子１０１と端子１０２との所定位置（例えば端子１０１と各ＬＥＤ（群）との間）にヒューズを設け、大電流の発生時にヒューズが切れることで、各ＬＥＤ（群）が保護されるようにしても良い。   In the LED circuits 100, 100A, 100B, and 100C, a fuse is provided at a predetermined position between the terminal 101 and the terminal 102 (for example, between the terminal 101 and each LED (group)), and the fuse is blown when a large current is generated. Thus, each LED (group) may be protected.

１０１，１０２・・・端子
１０３・・・第１ＬＥＤ群
１０４・・・第１ＬＥＤ群
１０５，１０６，１１１・・・保護回路
１０７，１０９，１１２，１１３・・・ツェナーダイオード
１０８，１１０・・・ダイオード
１２１，１２４・・・ＬＥＤ並列回路
１２２・・・第１ＬＥＤ
１２３・・・第２ＬＥＤ 101, 102 ... terminal 103 ... first LED group 104 ... first LED group 105, 106, 111 ... protection circuit 107, 109, 112, 113 ... Zener diode 108, 110 ... diode 121, 124 ... LED parallel circuit 122 ... first LED
123 ... 2nd LED

Claims (4)

極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤを含む二端子ＬＥＤ回路と、
ツェナーダイオードとこのツェナーダイオードに逆極性で直列接続されたダイオードとをそれぞれ含み、相互に異なる接続方向で前記二端子ＬＥＤ回路に並列接続される２つの二端子保護回路と、
を含むＬＥＤ発光装置。 A two-terminal LED circuit including a first LED and a second LED connected in parallel with opposite polarity;
Two two-terminal protection circuits each including a Zener diode and a diode connected in series with the Zener diode in reverse polarity, and connected in parallel to the two-terminal LED circuit in different connection directions;
LED light-emitting device comprising: 極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤを含む二端子ＬＥＤ回路と、
極性を逆にして直列接続された２つのツェナーダイオードを含み、前記ＬＥＤ二端子保護回路に並列接続される二端子保護回路と、
を含むＬＥＤ発光装置。 A two-terminal LED circuit including a first LED and a second LED connected in parallel with opposite polarity;
A two-terminal protection circuit including two Zener diodes connected in series with opposite polarities and connected in parallel to the LED two-terminal protection circuit;
LED light-emitting device comprising: 前記二端子ＬＥＤ回路は、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤが複数直列接続されてなる
請求項１又は２に記載のＬＥＤ発光装置。 The LED light-emitting device according to claim 1 or 2, wherein the two-terminal LED circuit includes a plurality of first LEDs and a plurality of second LEDs that are connected in parallel with opposite polarities. 前記二端子ＬＥＤ回路は、極性を逆にして並列接続された第１ＬＥＤ及び第２ＬＥＤが複数並列接続されてなる
請求項１から３のいずれか１項に記載のＬＥＤ発光装置。 4. The LED light-emitting device according to claim 1, wherein the two-terminal LED circuit includes a plurality of first LEDs and a plurality of second LEDs that are connected in parallel with opposite polarities. 5.
JP2011122174A 2010-09-27 2011-05-31 Led light-emitting device Withdrawn JP2012094811A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3171404A1 (en) * 2015-11-20 2017-05-24 Commissariat à l'Énergie Atomique et aux Énergies Alternatives Optoelectronic device with light-emitting diodes comprising at least one zener diode
US9888532B2 (en) 2015-03-12 2018-02-06 Panasonic Intellectual Property Management Co., Ltd. Lighting circuit and illumination system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9888532B2 (en) 2015-03-12 2018-02-06 Panasonic Intellectual Property Management Co., Ltd. Lighting circuit and illumination system
EP3171404A1 (en) * 2015-11-20 2017-05-24 Commissariat à l'Énergie Atomique et aux Énergies Alternatives Optoelectronic device with light-emitting diodes comprising at least one zener diode
FR3044167A1 (en) * 2015-11-20 2017-05-26 Commissariat Energie Atomique OPTOELECTRONIC LIGHT EMITTING DIODE DEVICE COMPRISING AT LEAST ONE ZENER DIODE
US9960152B2 (en) 2015-11-20 2018-05-01 Commissariat A L'energie Atomique Et Aux Energies Alternatives Optoelectronic device with light-emitting diodes comprising at least one zener diode

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