JP2008235186A - Led lighting device and display device - Google Patents

Led lighting device and display device Download PDF

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JP2008235186A
JP2008235186A JP2007076800A JP2007076800A JP2008235186A JP 2008235186 A JP2008235186 A JP 2008235186A JP 2007076800 A JP2007076800 A JP 2007076800A JP 2007076800 A JP2007076800 A JP 2007076800A JP 2008235186 A JP2008235186 A JP 2008235186A
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led
series circuit
voltage
constant current
led series
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Toshio Tsuji
俊雄 辻
Kimihito Sato
公仁 佐藤
Koji Takahashi
浩司 高橋
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Toshiba Lighting and Technology Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting device capable of detecting the abnormality of an LED in an LED series circuit and of lighting control over the LED series circuit. <P>SOLUTION: A constant current generating unit 12 generates a direct constant current based on dc power supply from a power source 11. When constant current from the constant current generating unit 12 is supplied to LED series circuits 13 and 14, a reference value setting unit 17 stores therein an initial LED voltage generated at a plurality of LEDs in the LED series circuits 13 and 14. Then, an abnormality detecting unit 16 detects the abnormality of an LED based on the initial LED voltage stored in the reference value setting unit 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、光源としてＬＥＤを使用したＬＥＤ点灯装置及び表示装置に関する。   The present invention relates to an LED lighting device and a display device using LEDs as light sources.

誘導灯や標識灯などの表示装置は、器具本体の正面に配置された表示板に対して光を出射して表示板を照明するように構成されている。通常、このような表示装置の表示板は平面的であるので、平面的な拡がりを持った光で表示板を照明することが必要である。そこで、複数のＬＥＤを直列接続した複数のＬＥＤラインを並列に配列して平面的なＬＥＤモジュールを構成したものがある（例えば、特許文献１参照）。   A display device such as a guide light or a marker light is configured to emit light to illuminate the display plate disposed on the front surface of the instrument body. Usually, the display plate of such a display device is flat, and it is necessary to illuminate the display plate with light having a flat spread. Therefore, there is a configuration in which a planar LED module is configured by arranging a plurality of LED lines in which a plurality of LEDs are connected in series in parallel (for example, see Patent Document 1).

特許文献１のものでは、各々のＬＥＤラインに流れる電流を定電流に制御してＬＥＤモジュールの点灯制御を行い、各々のＬＥＤラインのいずれかが異常となっても、ＬＥＤ点灯駆動回路全体の定電流レベルを下げて健全なＬＥＤラインに流れる電流を一定にするように制御している。
特開２００６−１０８５１９号公報 In Patent Document 1, the LED module lighting control is performed by controlling the current flowing in each LED line to a constant current, and even if one of the LED lines becomes abnormal, the entire LED lighting drive circuit is fixed. The current level is lowered to control the current flowing through the healthy LED line to be constant.
JP 2006-108519 A

しかし、特許文献１のものでは、ＬＥＤラインにおけるＬＥＤの異常検出を各ＬＥＤラインの両端電圧を用いて検出するようになっているため、すべて一律に異常検出の閾値を設定してしまうと、複数のＬＥＤが直列接続されたＬＥＤ直列回路の個々のＬＥＤのバラツキによりＬＥＤ順電圧が異なった場合には、ＬＥＤの異常検出が正確に行えないことがある。   However, since the abnormality detection of the LED in the LED line is detected using the both-end voltage of each LED line in the thing of patent document 1, if all set the abnormality detection threshold value uniformly, multiple When the LED forward voltage differs due to variations in individual LEDs in the LED series circuit in which the LEDs are connected in series, the LED abnormality detection may not be performed accurately.

本発明の目的は、ＬＥＤ直列回路のＬＥＤ異常を正確に行え、ＬＥＤ直列回路の点灯制御も容易に行うことができるＬＥＤ点灯装置及び表示装置を提供することである。   An object of the present invention is to provide an LED lighting device and a display device that can accurately perform LED abnormality in an LED series circuit and can easily perform lighting control of the LED series circuit.

請求項１の発明に係わるＬＥＤ点灯装置は、複数のＬＥＤが直列接続されたＬＥＤ直列回路に点灯用電力を供給する電源装置と；前記電源装置からの電源に基づいて直流の定電流を発生させる定電流発生部と；前記定電流発生部からの定電流が初期に前記ＬＥＤ直列回路に供給されたとき初期ＬＥＤ電圧を記憶する基準値設定部と；前記基準値設定部に記憶された初期ＬＥＤ電圧を基準にしてＬＥＤ直列回路の異常状態を判断する閾値を設定する閾値設定部と；前記ＬＥＤ直列回路の異常状態を閾値設定部の閾値に基づいて検出する異常検知部と；を備えたことを特徴とする。   An LED lighting device according to a first aspect of the present invention is a power supply device that supplies lighting power to an LED series circuit in which a plurality of LEDs are connected in series; and a DC constant current is generated based on the power supply from the power supply device A constant current generating unit; a reference value setting unit for storing an initial LED voltage when a constant current from the constant current generating unit is initially supplied to the LED series circuit; and an initial LED stored in the reference value setting unit A threshold value setting unit that sets a threshold value for determining an abnormal state of the LED series circuit based on the voltage; and an abnormality detection unit that detects the abnormal state of the LED series circuit based on the threshold value of the threshold value setting unit. It is characterized by.

本発明及び以下の発明において、特に指定しない限り用語の定義および技術的意味は以下による。   In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

電源装置とは直流電源そのもの及び交流電源を直流に変換して直流電力を供給するものの双方を含む。定電流発生部とは、ＬＥＤ直列回路に供給する直流電力を定電流となるように制御するものである。   The power supply device includes both a DC power supply itself and an apparatus that converts an AC power supply into DC and supplies DC power. The constant current generator controls the DC power supplied to the LED series circuit so as to become a constant current.

ＬＥＤ直列回路の初期ＬＥＤ電圧とは、電源装置から直流電力が初期状態で供給されたときのＬＥＤ直列回路の複数のＬＥＤに発生する電圧である。基準設定部、閾値設定部及び異常検知部は、例えばマイコンで実現される。例えば、電源装置から直流電力が初期状態で供給されたときに、ＬＥＤ直列回路の複数のＬＥＤに発生する電圧をマイコンで読み込み、マイコン内のメモリに形成される基準値設定部に初期ＬＥＤ電圧として記憶するとともに、閾値設定部に初期ＬＥＤ電圧を基準にしてＬＥＤ直列回路の異常状態を判断する閾値を設定する。そして、マイコンの処理機能の一部である異常検知部は閾値設定部の閾値に基づいてＬＥＤの異常状態を検出する。   The initial LED voltage of the LED series circuit is a voltage generated in a plurality of LEDs of the LED series circuit when DC power is supplied from the power supply device in an initial state. The reference setting unit, the threshold setting unit, and the abnormality detection unit are realized by, for example, a microcomputer. For example, when DC power is supplied from the power supply device in the initial state, the voltage generated in the plurality of LEDs of the LED series circuit is read by the microcomputer, and the initial LED voltage is set in the reference value setting unit formed in the memory in the microcomputer. In addition, the threshold value setting unit sets a threshold value for determining an abnormal state of the LED series circuit based on the initial LED voltage. And the abnormality detection part which is a part of processing function of a microcomputer detects the abnormal state of LED based on the threshold value of a threshold value setting part.

請求項２の発明に係わるＬＥＤ点灯装置は、請求項１の発明において、前記ＬＥＤ直列回路は２並列以上に並列接続され、２並列以上の前記ＬＥＤ直列回路のうちの一つは、前記定電流発生部からの定電流が印加されて点灯される定電流ＬＥＤ直列回路であり、残りのＬＥＤ直列回路は前記定電流ＬＥＤ直列回路の両端電圧が印加されて点灯される定電圧ＬＥＤ直列回路であり、前記異常検知部は、前記定電流ＬＥＤ直列回路の異常は前記定電流ＬＥＤ直列回路の両端電圧に基づいて検出し、前記定電圧ＬＥＤ直列回路の異常は前記定電圧ＬＥＤ直列回路の限流抵抗の電流に基づいて検出することを特徴とする。   The LED lighting device according to a second aspect of the present invention is the LED lighting device according to the first aspect, wherein the LED series circuit is connected in parallel with two or more parallels, and one of the LED series circuits with two or more parallels is the constant current. A constant current LED series circuit that is lit by applying a constant current from the generator, and the remaining LED series circuit is a constant voltage LED series circuit that is lit by applying a voltage across the constant current LED series circuit. The abnormality detection unit detects an abnormality of the constant current LED series circuit based on a voltage across the constant current LED series circuit, and an abnormality of the constant voltage LED series circuit is a current limiting resistance of the constant voltage LED series circuit. It detects based on the electric current of this, It is characterized by the above-mentioned.

定電流ＬＥＤ直列回路とは、定電流発生部からの定電流点灯されるＬＥＤ直列回路であり、直列接続された複数のＬＥＤ及びその複数のＬＥＤに流れる定電流を検出する電流検出用抵抗を直列接続して構成される。定電流発生部とは、複数のＬＥＤ直列回路のうち定電流ＬＥＤ直列回路に供給する直流電力を直流電流が定電流となるように制御する。   The constant current LED series circuit is an LED series circuit that is lit by a constant current from a constant current generator, and includes a plurality of LEDs connected in series and a current detection resistor for detecting a constant current flowing through the plurality of LEDs in series. Connected and configured. The constant current generator controls the DC power supplied to the constant current LED series circuit among the plurality of LED series circuits so that the DC current becomes a constant current.

定電圧ＬＥＤ直列回路とは、直列接続された複数のＬＥＤ及び限流抵抗を直列接続して構成され、定電流ＬＥＤ直列回路に並列接続されるＬＥＤ直列回路である。定電圧ＬＥＤ直列回路には、定電流ＬＥＤ直列回路の両端電圧が印加され、この印加される定電流ＬＥＤ直列回路の両端電圧により流れる電流で複数のＬＥＤを点灯する。   The constant voltage LED series circuit is an LED series circuit configured by connecting a plurality of LEDs connected in series and a current limiting resistor in series and connected in parallel to the constant current LED series circuit. A voltage across the constant current LED series circuit is applied to the constant voltage LED series circuit, and a plurality of LEDs are turned on with a current flowing through the voltage across the constant current LED series circuit.

定電流ＬＥＤ直列回路の両端電圧とは、定電流発生部から供給される定電流が流れたときに定電流ＬＥＤ直列回路の両端に発生する電圧である。異常検知部は、定電流ＬＥＤ直列回路の電圧の低下により定電流ＬＥＤ直列回路のＬＥＤの短絡故障を検出し、定電流ＬＥＤ直列回路の電圧の上昇により定電流ＬＥＤ直列回路のＬＥＤの開放故障を検出する。   The voltage across the constant current LED series circuit is a voltage generated across the constant current LED series circuit when a constant current supplied from the constant current generator flows. The anomaly detector detects a short circuit failure of the LED of the constant current LED series circuit due to a decrease in the voltage of the constant current LED series circuit, and an open failure of the LED of the constant current LED series circuit due to an increase in the voltage of the constant current LED series circuit. To detect.

定電圧ＬＥＤ直列回路の限流抵抗の電流とは、定電圧ＬＥＤ直列回路に定電流ＬＥＤ直列回路の両端電圧が印加されたときに限流抵抗に流れる電流である。異常検知部は、限流抵抗の電圧が上昇により定電圧ＬＥＤ直列回路のＬＥＤの短絡故障を検出し、限流抵抗の電圧が低下により定電圧ＬＥＤ直列回路のＬＥＤの開放故障を検出する。   The current of the current limiting resistor of the constant voltage LED series circuit is a current that flows through the current limiting resistor when the voltage across the constant current LED series circuit is applied to the constant voltage LED series circuit. The abnormality detection unit detects a short circuit failure of the LED of the constant voltage LED series circuit when the voltage of the current limiting resistor increases, and detects an open failure of the LED of the constant voltage LED series circuit when the voltage of the current limiting resistor decreases.

請求項３の発明に係わるＬＥＤ点灯装置は、請求項１または２の発明において、前記電源装置は、常用時には商用電源を直流に変換してバッテリに充電するとともにＬＥＤに点灯用電力を供給し、商用電源が停電した非常時にはバッテリからＬＥＤに点灯用電力を供給するものであり、前記異常検知部は、常用時と非常時とで異常状態の検出レベルを変えることを特徴とする。   The LED lighting device according to the invention of claim 3 is the invention according to claim 1 or 2, wherein the power supply device converts the commercial power source into direct current during normal use to charge the battery and supplies lighting power to the LED. The power supply for lighting is supplied from the battery to the LED in the event of an emergency when the commercial power supply fails, and the abnormality detection unit changes the detection level of the abnormal state between the normal use and the emergency.

常用時とは商用電源から正常に交流電力が供給されているときであり、非常時とは商用電源からの交流電力の供給が正常に供給されなくなったときである。常用時には商用電源からの交流電力を整流した直流電力が供給され、非常時にはバッテリに蓄積された直流電流が供給される。   The normal use time is when AC power is normally supplied from the commercial power supply, and the emergency time is when AC power supply from the commercial power supply is not normally supplied. In normal use, DC power obtained by rectifying AC power from a commercial power supply is supplied, and in an emergency, DC current stored in the battery is supplied.

商用電源からの交流電力を整流した直流電力が供給されている常用時と、バッテリからの直流電力が供給されている異常時とでは、ＬＥＤ直列回路の供給される点灯電力は異なる。常用時は通常の点灯電力が供給され、非常時は通常の点灯電力より小さい点灯電力が供給される。それに伴い、常用時の異常状態の検出レベルと、非常時の異常状態の検出レベルとを異ならせる。   The lighting power supplied from the LED series circuit is different between the normal use in which the DC power obtained by rectifying the AC power from the commercial power supply is supplied and the abnormal time in which the DC power from the battery is supplied. Normal lighting power is supplied during normal use, and lighting power smaller than normal lighting power is supplied during an emergency. Accordingly, the detection level of the abnormal state during normal use is different from the detection level of the abnormal state during emergency.

請求項４の発明に係わるＬＥＤ点灯装置は、請求項３の発明において、前記閾値設定部は、常用時又は非常時のいずれか一方の初期ＬＥＤ電圧によりいずれか一方の閾値を設定すると他方の閾値も自動的に設定されることを特徴とする。   According to a fourth aspect of the present invention, there is provided the LED lighting device according to the third aspect of the present invention, wherein the threshold value setting unit sets one of the threshold values according to the initial LED voltage during normal use or emergency, and the other threshold value. Is also set automatically.

常時と非常時との点灯電力を所定値とすることで、この点灯電力の所定値と一方側の閾値とで他方の閾値を設定することができる。なお、この点灯電力の所定値は、予め定めることもできるし、一方のＬＥＤ電圧に基づいて定めてもよい。   By setting the lighting power during normal and emergency to a predetermined value, the other threshold value can be set between the predetermined value of the lighting power and the threshold value on one side. Note that the predetermined value of the lighting power may be determined in advance or may be determined based on one LED voltage.

請求項５の発明に係わる表示装置は、請求項１ないし４のいずれか一記載のＬＥＤ点灯装置と；前記ＬＥＤを点灯制御するＬＥＤ点灯装置を収納する器具本体と；前記器具本体の前面部に形成され前記導光板の出射面に設けられた表示板と；を備えたことを特徴とする。   A display device according to a fifth aspect of the present invention comprises: the LED lighting device according to any one of the first to fourth aspects; an instrument main body that houses the LED lighting device that controls the lighting of the LED; and a front surface portion of the instrument main body. And a display plate formed on the light exit surface of the light guide plate.

請求項１の発明によれば、初期ＬＥＤ電圧を基準にしてＬＥＤの異常状態を検出するので、ＬＥＤのバラツキによりＬＥＤ順電圧が異なった場合であっても、ＬＥＤの異常検出をより正確に行うことができる。   According to the first aspect of the present invention, since the abnormal state of the LED is detected based on the initial LED voltage, even if the LED forward voltage differs due to the variation in the LED, the abnormality of the LED is detected more accurately. be able to.

請求項２の発明よれば、定電流ＬＥＤ直列回路に供給される定電流を制御することによって、定電圧ＬＥＤ直列回路に印加される定電流ＬＥＤ直列回路の両端電圧が制御されるので、ＬＥＤ直列回路の点灯制御を容易に行うことができる。また、定電流ＬＥＤ直列回路の異常は定電流ＬＥＤ直列回路の両端電圧の低下または上昇で検出でき、定電圧ＬＥＤ直列回路の異常は定電圧ＬＥＤ直列回路の限流抵抗の電流の増減で検出できるので、ＬＥＤ異常の検出が容易に行える。   According to the invention of claim 2, by controlling the constant current supplied to the constant current LED series circuit, the voltage across the constant current LED series circuit applied to the constant voltage LED series circuit is controlled. The lighting control of the circuit can be easily performed. Also, an abnormality in the constant current LED series circuit can be detected by a decrease or increase in the voltage across the constant current LED series circuit, and an abnormality in the constant voltage LED series circuit can be detected by an increase or decrease in the current of the current limiting resistor of the constant voltage LED series circuit. Therefore, the LED abnormality can be easily detected.

請求項３の発明によれば、ＬＥＤ直列回路の供給される点灯電力に応じて、常用時の異常状態の検出レベルと非常時の異常状態の検出レベルとを異ならせるので、より適切にＬＥＤの異常検出を行うことができる。   According to the invention of claim 3, since the detection level of the abnormal state at the time of normal use and the detection level of the abnormal state at the time of emergency are made different according to the lighting power supplied from the LED series circuit, Abnormality detection can be performed.

請求項４の発明によれば、閾値が異なる二形態であっても、いずれか一方の検出及び設定で済むので設定作業が容易となる。   According to the fourth aspect of the present invention, even if there are two forms with different threshold values, only one of the detection and setting is sufficient, so that the setting operation becomes easy.

請求項５の発明によれば、請求項１ないし４のいずれか一の発明の効果を有した表示装置を提供できる。   According to the invention of claim 5, it is possible to provide a display device having the effect of the invention of any one of claims 1 to 4.

図１は本発明の実施の形態に係わるＬＥＤ点灯装置の構成図である。ＬＥＤ点灯装置は、電源装置１１及び定電流発生部１２を有し、複数のＬＥＤが直列接続されたＬＥＤ直列回路として、定電流ＬＥＤ直列回路１３と定電圧ＬＥＤ直列回路１４とを備えている。また、定電流ＬＥＤ直列回路１３の両端電圧は、両端電圧検出用抵抗Ｒａ、Ｒｂで検出されマイコン１５に入力される。マイコン１５は異常検知部１６、基準位置設定部１７及び閾値設定部３６を備えている。   FIG. 1 is a configuration diagram of an LED lighting device according to an embodiment of the present invention. The LED lighting device includes a power supply device 11 and a constant current generation unit 12, and includes a constant current LED series circuit 13 and a constant voltage LED series circuit 14 as an LED series circuit in which a plurality of LEDs are connected in series. The voltage across the constant current LED series circuit 13 is detected by the voltage detection resistors Ra and Rb and input to the microcomputer 15. The microcomputer 15 includes an abnormality detection unit 16, a reference position setting unit 17, and a threshold setting unit 36.

マイコン１５の基準値設定部１７は、ＬＥＤ直列回路の初期ＬＥＤ電圧を記憶するものである。そして、異常検知部１６は、基準値設定部１７に記憶された初期ＬＥＤ電圧を基準にしてＬＥＤ直列回路のＬＥＤの異常状態を検出する。ＬＥＤ直列回路の初期ＬＥＤ電圧は、電源装置１１から直流電力がＬＥＤ直列回路に初期状態で供給されたときのＬＥＤ直列回路の複数のＬＥＤに発生する電圧であり、例えば、電源装置１１から直流電力が初期状態で供給されたときに、ＬＥＤ直列回路の複数のＬＥＤに発生する電圧をマイコン１５で読み込み、マイコン１５内のメモリに形成される基準値設定部１７に初期ＬＥＤ電圧として記憶する。また、閾値設定部３６に初期ＬＥＤ電圧を基準にしてＬＥＤ直列回路の異常状態を判断する閾値を設定する。そして、異常検知部１６は閾値設定部３６の閾値に基づいてＬＥＤの異常状態を検出する。   The reference value setting unit 17 of the microcomputer 15 stores the initial LED voltage of the LED series circuit. Then, the abnormality detection unit 16 detects the abnormal state of the LEDs in the LED series circuit based on the initial LED voltage stored in the reference value setting unit 17. The initial LED voltage of the LED series circuit is a voltage generated in a plurality of LEDs of the LED series circuit when DC power is supplied from the power supply device 11 to the LED series circuit in an initial state. Is supplied in the initial state, the voltage generated in the plurality of LEDs of the LED series circuit is read by the microcomputer 15 and stored in the reference value setting unit 17 formed in the memory in the microcomputer 15 as the initial LED voltage. Further, a threshold for determining an abnormal state of the LED series circuit is set in the threshold setting unit 36 based on the initial LED voltage. Then, the abnormality detection unit 16 detects the abnormal state of the LED based on the threshold value of the threshold value setting unit 36.

基準値設定部１７への初期ＬＥＤ電圧の記憶及び閾値設定部３６への閾値の設定は、製品の製造過程において初期設定が行われ、製品の出荷後に閾値設定部３６の閾値に基づいてＬＥＤの異常状態を検出することになる。   The initial LED voltage is stored in the reference value setting unit 17 and the threshold value is set in the threshold setting unit 36 in the manufacturing process of the product, and the LED is set based on the threshold value of the threshold setting unit 36 after the product is shipped. An abnormal state will be detected.

図２はマイコン１５による基準値設定部１７への初期ＬＥＤ電圧の記憶及び閾値設定部３６への閾値の設定の手順を示すフローチャートである。   FIG. 2 is a flowchart showing a procedure for storing the initial LED voltage in the reference value setting unit 17 and setting the threshold value in the threshold setting unit 36 by the microcomputer 15.

まず、製品の製造過程において電源装置からＬＥＤ直列回路１３、１４に定電流を流し（Ｓ１）、このときのＬＥＤに発生する電圧を初期ＬＥＤ電圧として記憶するとともに（Ｓ２）、初期ＬＥＤ電圧を基準にしてＬＥＤの異常状態を判断するための閾値を設定する（Ｓ３）。そして、製品の出荷後は、設定された閾値に基づいてＬＥＤの異常状態を検出する（Ｓ４）。 First, in the product manufacturing process, a constant current is passed from the power supply device to the LED series circuits 13 and 14 (S1), the voltage generated in the LED at this time is stored as the initial LED voltage (S2), and the initial LED voltage is used as a reference Then, a threshold value for determining the abnormal state of the LED is set (S3). Then, after the product is shipped, the abnormal state of the LED is detected based on the set threshold value (S4).

このように、製品の製造過程において、基準値設定部１７への初期ＬＥＤ電圧の記憶及び閾値設定部３６への閾値の設定の初期設定が行われるので、市場に流通する製品の実際の使用時に発生する異常を確実に検知することができる。また、仮に初期の段階でＬＥＤに異常が生じている場合には、製造過程において設定作業を行うので、当該製造時の初期段階でＬＥＤの異常を判断できるので、異常である製品を異常に流通させることを防止できる。   In this way, in the manufacturing process of the product, the initial setting of the initial LED voltage in the reference value setting unit 17 and the setting of the threshold value in the threshold setting unit 36 is performed. Therefore, during the actual use of the product distributed in the market Abnormalities that occur can be reliably detected. Also, if there is an abnormality in the LED at the initial stage, the setting work is performed in the manufacturing process, so that the abnormality of the LED can be judged at the initial stage of the manufacturing, so that the abnormal product is distributed abnormally. Can be prevented.

次に、電源装置１１は、商用電源１８からの交流電力を整流回路１９で整流して直流電力に変換し、インテリジェントパワーデバイス（ＩＰＤ）２０及びトランス２１を介して、常用時直流電源２２及び非常時直流電源２３に直流電力を供給する。非常時直流電源２３はバッテリ２４を備え、商用電源１８から電力が供給されている常用時において、充電制御回路２５によりバッテリ２４に充電する。また、トランス２１の一次側には電源監視回路２６が設けられ、商用電源１８から正常に交流電力が供給されているか否かの監視が行われている。   Next, the power supply device 11 rectifies the AC power from the commercial power supply 18 by the rectifier circuit 19 and converts it into DC power, and through the intelligent power device (IPD) 20 and the transformer 21, DC power is supplied to the DC power source 23 at the time. The emergency DC power supply 23 includes a battery 24, and charges the battery 24 by the charge control circuit 25 during normal use when power is supplied from the commercial power supply 18. Further, a power supply monitoring circuit 26 is provided on the primary side of the transformer 21 to monitor whether or not AC power is normally supplied from the commercial power supply 18.

定電流発生部１２は点灯制御回路２７及び制御ＩＣ２８を備え、商用電源１８から電力が供給されている常用時においては、常用時直流電源２２から定電流発生部１２の点灯制御回路２７により定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４のＬＥＤ点灯用の直流電力を供給するとともに、非常時直流電源２３から充電制御回路２５によりバッテリ２４に充電する。   The constant current generator 12 includes a lighting control circuit 27 and a control IC 28. In normal operation when power is supplied from the commercial power supply 18, the constant current generator 12 supplies a constant current from the normal DC power supply 22 by the lighting control circuit 27 of the constant current generator 12. The LED series circuit 13 and the constant voltage LED series circuit 14 are supplied with DC power for LED lighting, and the battery 24 is charged by the charge control circuit 25 from the emergency DC power supply 23.

一方、電源監視回路２６が商用電源１８が喪失し、商用電源１８から電力が供給されない非常時を検出すると、電源監視回路２６はマイコン１５、充電制御回路２５、点灯制御回路２７にその旨を通知する。商用電源１８から電力が供給されない非常時においては、バッテリ２４から定電流発生部１２の制御ＩＣ２８により定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４のＬＥＤ点灯用の直流電力を供給する。   On the other hand, when the power monitoring circuit 26 detects an emergency in which the commercial power supply 18 is lost and no power is supplied from the commercial power supply 18, the power monitoring circuit 26 notifies the microcomputer 15, the charging control circuit 25, and the lighting control circuit 27 to that effect. To do. In an emergency when power is not supplied from the commercial power supply 18, direct current power for LED lighting of the constant current LED series circuit 13 and the constant voltage LED series circuit 14 is supplied from the battery 24 by the control IC 28 of the constant current generator 12.

定電流ＬＥＤ直列回路１３は、直列接続された複数のＬＥＤ２９ａ、スイッチ素子Ｑ１と電流検出用抵抗Ｒ１との直列回路３０、及びスイッチ素子Ｑ２と電流検出用抵抗Ｒ２との直列回路３１を有している。直列回路３０、３１は並列接続され、直列回路３０、３１の並列回路は複数のＬＥＤ２９ａに直列接続されている。   The constant current LED series circuit 13 includes a plurality of LEDs 29a connected in series, a series circuit 30 of a switch element Q1 and a current detection resistor R1, and a series circuit 31 of a switch element Q2 and a current detection resistor R2. Yes. The series circuits 30 and 31 are connected in parallel, and the parallel circuit of the series circuits 30 and 31 is connected in series to the plurality of LEDs 29a.

直列回路３０は非常時において、マイコン１５からの指令によりスイッチ素子Ｑ１がオンとなり、定電流発生部１２の制御ＩＣ２８により電流検出用抵抗Ｒ１が所定値を維持するように、非常時において定電流ＬＥＤ直列回路１３に流れる電流を制御する。   In an emergency, the series circuit 30 is turned on in response to a command from the microcomputer 15 and the constant current LED is turned on in the emergency so that the control IC 28 of the constant current generator 12 maintains the current detection resistor R1 at a predetermined value. The current flowing through the series circuit 13 is controlled.

直列回路３１は常用時において、マイコン１５からの指令によりスイッチ素子Ｑ２がオンとなり、定電流発生部１２の点灯用制御回路２７により電流検出用抵抗Ｒ２が所定値を維持するように、常用時において定電流ＬＥＤ直列回路１３に流れる電流を制御する。   The series circuit 31 is normally used so that the switch element Q2 is turned on by a command from the microcomputer 15 and the current detection resistor R2 is maintained at a predetermined value by the lighting control circuit 27 of the constant current generator 12 in normal use. The current flowing through the constant current LED series circuit 13 is controlled.

定電圧ＬＥＤ直列回路１４は、直列接続された複数のＬＥＤ２９ｂ、スイッチ素子Ｑ３と限流抵抗Ｒ３との直列回路３２、及びスイッチ素子Ｑ４と限流抵抗Ｒ４との直列回路３３を有している。直列回路３２、３３は並列接続され、直列回路３２、３３の並列回路は複数のＬＥＤ２９ｂに直列接続されている。   The constant voltage LED series circuit 14 includes a plurality of LEDs 29b connected in series, a series circuit 32 of a switch element Q3 and a current limiting resistor R3, and a series circuit 33 of a switch element Q4 and a current limiting resistor R4. The series circuits 32 and 33 are connected in parallel, and the parallel circuit of the series circuits 32 and 33 is connected in series to the plurality of LEDs 29b.

直列回路３２は非常時において、マイコン１５からの指令によりスイッチ素子Ｑ３がオンとなり、非常時において定電圧ＬＥＤ直列回路１４に印加される定電流ＬＥＤ直列回路１３の端子電圧により、複数のＬＥＤ２９ｂに電流を流す。そして、限流抵抗Ｒ３に流れる電流をマイコン１５の異常検知部１６に出力し、異常検知部１６で非常時に定電圧ＬＥＤ直列回路１４に流れる電流を監視する。   In an emergency, the switch element Q3 is turned on by a command from the microcomputer 15 in an emergency, and the current to the plurality of LEDs 29b is generated by the terminal voltage of the constant current LED series circuit 13 applied to the constant voltage LED series circuit 14 in an emergency. Shed. Then, the current flowing through the current limiting resistor R3 is output to the abnormality detection unit 16 of the microcomputer 15, and the abnormality detection unit 16 monitors the current flowing through the constant voltage LED series circuit 14 in an emergency.

直列回路３２は常用時において、マイコン１５からの指令によりスイッチ素子Ｑ４がオンとなり、常用時において定電圧ＬＥＤ直列回路１４に印加される定電流ＬＥＤ直列回路１３の端子電圧により、複数のＬＥＤ２９ｂに電流を流す。そして、限流抵抗Ｒ４に流れる電流をマイコン１５の異常検知部１６に出力し、異常検知部１６で常用時に定電圧ＬＥＤ直列回路１４に流れる電流を監視する。   In the normal circuit 32, the switch element Q4 is turned on by a command from the microcomputer 15 in normal use, and current is supplied to the plurality of LEDs 29b by the terminal voltage of the constant current LED series circuit 13 applied to the constant voltage LED serial circuit 14 in normal use. Shed. Then, the current flowing through the current limiting resistor R4 is output to the abnormality detection unit 16 of the microcomputer 15, and the abnormality detection unit 16 monitors the current flowing through the constant voltage LED series circuit 14 during normal use.

また、マイコン１５の異常検知部１６には、定電流ＬＥＤ直列回路１３の両端電圧を検出する両端電圧検出用抵抗Ｒａ、Ｒｂの電圧が入力され、定電流ＬＥＤ直列回路１３の両端電圧が監視される。   Further, the voltage of both-end voltage detection resistors Ra and Rb for detecting the voltage across the constant current LED series circuit 13 is input to the abnormality detection unit 16 of the microcomputer 15, and the voltage across the constant-current LED series circuit 13 is monitored. The

次に、マイコン１５の異常検知部１６での定電流ＬＥＤ直列回路１３のＬＥＤの故障検出について説明する。いま、常用時の場合について説明する。常用時において、定電流ＬＥＤ回路１３のいずれかのＬＥＤに短絡故障が発生したとすると、電流検出用抵抗Ｒ２に流れる電流が多くなり電流検出用抵抗Ｒ２の電圧が上昇する。この変化に対し、定電流発生部１２の点灯制御回路２７は、定電流ＬＥＤ直列回路１３に流れる電流が所定値になるように制御する。つまり、電流検出用抵抗Ｒ２の電圧が所定値になるように定電流ＬＥＤ直列回路１３に流れる電流を抑制する方向に制御する。従って、定電流ＬＥＤ直列回路１３の電圧が低下する。そこで、異常検知部１６は、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧を監視し、定電流ＬＥＤ直列回路１３の電圧の低下により、定電流ＬＥＤ直列回路１３のＬＥＤに短絡故障が発生したと判定する。   Next, the failure detection of the LED of the constant current LED series circuit 13 in the abnormality detection unit 16 of the microcomputer 15 will be described. Now, the case of regular use will be described. If a short circuit failure occurs in any LED of the constant current LED circuit 13 during normal use, the current flowing through the current detection resistor R2 increases and the voltage of the current detection resistor R2 increases. In response to this change, the lighting control circuit 27 of the constant current generator 12 controls the current flowing through the constant current LED series circuit 13 to be a predetermined value. That is, control is performed so as to suppress the current flowing through the constant current LED series circuit 13 so that the voltage of the current detection resistor R2 becomes a predetermined value. Therefore, the voltage of the constant current LED series circuit 13 decreases. Therefore, the abnormality detection unit 16 monitors the voltages of the voltage detection resistors Ra and Rb at both ends, and determines that a short-circuit failure has occurred in the LED of the constant current LED series circuit 13 due to a decrease in the voltage of the constant current LED series circuit 13. To do.

一方、定電流ＬＥＤ回路１３のいずれかのＬＥＤに開放故障が発生したとすると、電流検出用抵抗Ｒ２に流れる電流が少なくなり（零となり）、電流検出用抵抗Ｒ２の電圧が下降する。この変化に対し、定電流発生部１２の点灯制御回路２７は、定電流ＬＥＤ直列回路１３に流れる電流が所定値になるように、電流検出用抵抗Ｒ２の電圧が所定値になるように定電流ＬＥＤ直列回路１３に流れる電流を増加する方向に制御する。従って、定電流ＬＥＤ直列回路１３の電圧が上昇する。そこで、異常検知部１６は、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧を監視し、定電流ＬＥＤ直列回路１３の電圧の上昇により、定電流ＬＥＤ直列回路１３のＬＥＤに開放故障が発生したと判定する。   On the other hand, if an open circuit failure has occurred in any LED of the constant current LED circuit 13, the current flowing through the current detection resistor R2 decreases (becomes zero), and the voltage of the current detection resistor R2 drops. In response to this change, the lighting control circuit 27 of the constant current generating unit 12 adjusts the constant current so that the current flowing through the constant current LED series circuit 13 becomes a predetermined value and the voltage of the current detection resistor R2 becomes a predetermined value. The current flowing through the LED series circuit 13 is controlled to increase. Therefore, the voltage of the constant current LED series circuit 13 increases. Therefore, the abnormality detection unit 16 monitors the voltages of the voltage detection resistors Ra and Rb at both ends, and determines that an open circuit failure has occurred in the LEDs of the constant current LED series circuit 13 due to the increase in the voltage of the constant current LED series circuit 13. To do.

以上の説明では、常用時の場合について説明したが、非常時の場合も同様に、異常検知部１６は、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧を監視し、定電流ＬＥＤ直列回路１３の電圧の低下により定電流ＬＥＤ直列回路１３のＬＥＤの短絡故障を検出し、定電流ＬＥＤ直列回路１３の電圧の上昇により、定電流ＬＥＤ直列回路１３のＬＥＤの開放故障を検出する。   In the above description, the case of normal use has been described. Similarly, in the case of an emergency, the abnormality detection unit 16 monitors the voltages of the both-end voltage detection resistors Ra and Rb, and the voltage of the constant current LED series circuit 13. The short circuit failure of the LED of the constant current LED series circuit 13 is detected by the decrease of the voltage, and the open failure of the LED of the constant current LED series circuit 13 is detected by the increase of the voltage of the constant current LED series circuit 13.

次に、マイコン１５の異常検知部１６での定電圧ＬＥＤ直列回路１４のＬＥＤの故障検出について説明する。いま、常用時の場合について説明する。定電圧ＬＥＤ直列回路１４のＬＥＤに短絡故障が発生したとすると、定電圧ＬＥＤ直列回路１４の限流抵抗Ｒ４に流れる電流が多くなり、限流抵抗Ｒ４の電圧が上昇する。そこで、異常検知部１６は、限流抵抗Ｒ４に流れる電流（限流抵抗Ｒ４の電圧）を監視し、その電圧の上昇により、定電圧ＬＥＤ直列回路１４のＬＥＤに短絡故障が発生したと判定する。   Next, the failure detection of the LED of the constant voltage LED series circuit 14 in the abnormality detection unit 16 of the microcomputer 15 will be described. Now, the case of regular use will be described. If a short circuit failure occurs in the LED of the constant voltage LED series circuit 14, the current flowing through the current limiting resistor R4 of the constant voltage LED series circuit 14 increases, and the voltage of the current limiting resistor R4 increases. Therefore, the abnormality detection unit 16 monitors the current flowing through the current limiting resistor R4 (the voltage of the current limiting resistor R4), and determines that a short circuit failure has occurred in the LED of the constant voltage LED series circuit 14 due to the increase in the voltage. .

一方、定電圧ＬＥＤ直列回路１４のＬＥＤに開放故障が発生したとすると、限流抵抗Ｒ４に流れる電流が少なくなり（零となり）、限流抵抗Ｒ４の電圧が下降する。そこで、異常検知部１６は、限流抵抗Ｒ４に流れる電流（限流抵抗Ｒ４の電圧）を監視し、その電圧の低下により、定電圧ＬＥＤ直列回路１４のＬＥＤに開放故障が発生したと判定する。   On the other hand, if an open circuit failure occurs in the LED of the constant voltage LED series circuit 14, the current flowing through the current limiting resistor R4 decreases (becomes zero), and the voltage of the current limiting resistor R4 decreases. Therefore, the abnormality detection unit 16 monitors the current flowing through the current limiting resistor R4 (voltage of the current limiting resistor R4), and determines that an open circuit failure has occurred in the LED of the constant voltage LED series circuit 14 due to the decrease in the voltage. .

以上の説明では、常用時の場合について説明したが、非常時の場合も同様に、異常検知部１６は、限流抵抗Ｒ３の電圧を監視し、限流抵抗Ｒ３の電圧の上昇により定電圧ＬＥＤ直列回路１４のＬＥＤの短絡故障を検出し、限流抵抗Ｒ３の電圧の低下により定電圧ＬＥＤ直列回路１４のＬＥＤの開放故障を検出する。   In the above description, the case of normal use has been described. Similarly, in the case of emergency, the abnormality detection unit 16 monitors the voltage of the current limiting resistor R3, and increases the voltage of the current limiting resistor R3, thereby increasing the constant voltage LED. A short circuit failure of the LED of the series circuit 14 is detected, and an open failure of the LED of the constant voltage LED series circuit 14 is detected by a decrease in the voltage of the current limiting resistor R3.

前述したように、マイコン１５の基準値設定部１７には、ＬＥＤ直列回路の初期ＬＥＤ電圧が記憶される。ＬＥＤ直列回路が定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４で形成される場合には、定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４の常用時及び非常時の初期ＬＥＤ電圧が記憶される。そして、異常検知部１６は、基準値設定部１７に記憶された初期ＬＥＤ電圧を基準にしてＬＥＤの異常状態を検出する。   As described above, the reference value setting unit 17 of the microcomputer 15 stores the initial LED voltage of the LED series circuit. When the LED series circuit is formed of the constant current LED series circuit 13 and the constant voltage LED series circuit 14, the initial LED voltages during normal use and emergency of the constant current LED series circuit 13 and the constant voltage LED series circuit 14 are stored. Is done. The abnormality detection unit 16 detects an abnormal state of the LED based on the initial LED voltage stored in the reference value setting unit 17.

定電流ＬＥＤ直列回路１３の常用時の初期ＬＥＤ電圧は、定電流ＬＥＤ直列回路１３のスイッチ素子Ｑ２がオンの状態で、商用電源１８からの交流電力を整流した直流電力が初期状態で供給されたときの複数のＬＥＤ２９ａに発生する電圧であり、定電流ＬＥＤ直列回路１３の電流検出用抵抗Ｒ２の電圧と、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧との差電圧で検出される。   The initial LED voltage during normal use of the constant current LED series circuit 13 is supplied in the initial state with DC power obtained by rectifying AC power from the commercial power supply 18 with the switch element Q2 of the constant current LED series circuit 13 turned on. This voltage is generated in the plurality of LEDs 29a, and is detected by a difference voltage between the voltage of the current detection resistor R2 of the constant current LED series circuit 13 and the voltages of the both-end voltage detection resistors Ra and Rb.

定電流ＬＥＤ直列回路１３の非常時の初期ＬＥＤ電圧は、定電流ＬＥＤ直列回路１３のスイッチ素子Ｑ１がオンの状態で、バッテリ２４からの直流電力が初期状態で供給されたときの複数のＬＥＤ２９ａに発生する電圧であり、定電流ＬＥＤ直列回路１３の電流検出用抵抗Ｒ１の電圧と、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧との差電圧で検出される。   The initial LED voltage at the time of emergency of the constant current LED series circuit 13 is applied to the plurality of LEDs 29a when the switch element Q1 of the constant current LED series circuit 13 is on and the DC power from the battery 24 is supplied in the initial state. This voltage is generated, and is detected by a difference voltage between the voltage of the current detection resistor R1 of the constant current LED series circuit 13 and the voltages of the both-end voltage detection resistors Ra and Rb.

同様に、定電圧ＬＥＤ直列回路１４の常用時の初期ＬＥＤ電圧は、定電圧ＬＥＤ直列回路１４のスイッチ素子Ｑ４がオンの状態で、商用電源１８からの交流電力を整流した直流電力が初期状態で供給されたときの複数のＬＥＤ２９ｂに発生する電圧であり、定電圧ＬＥＤ直列回路１４の限流抵抗Ｒ４の電圧と、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧との差電圧で検出される。   Similarly, the initial LED voltage during normal use of the constant voltage LED series circuit 14 is such that the DC power obtained by rectifying the AC power from the commercial power supply 18 is in the initial state when the switch element Q4 of the constant voltage LED series circuit 14 is on. This is a voltage generated in the plurality of LEDs 29b when supplied, and is detected by a difference voltage between the voltage of the current limiting resistor R4 of the constant voltage LED series circuit 14 and the voltages of the both-end voltage detecting resistors Ra and Rb.

定電圧ＬＥＤ直列回路１４の非常時の初期ＬＥＤ電圧は、定電圧ＬＥＤ直列回路１４のスイッチ素子Ｑ３がオンの状態で、バッテリ２４からの直流電力が初期状態で供給されたときの複数のＬＥＤ２９ｂに発生する電圧であり、定電圧ＬＥＤ直列回路１４の限流抵抗Ｒ３の電圧と、両端電圧検出用抵抗Ｒａ、Ｒｂの電圧との差電圧で検出される。   The initial LED voltage at the time of emergency of the constant voltage LED series circuit 14 is applied to the plurality of LEDs 29b when the DC power from the battery 24 is supplied in the initial state with the switch element Q3 of the constant voltage LED series circuit 14 turned on. This is a generated voltage, and is detected by a difference voltage between the voltage of the current limiting resistor R3 of the constant voltage LED series circuit 14 and the voltages of the both-end voltage detecting resistors Ra and Rb.

以上の説明では、マイコン１５の基準値設定部１７に、定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４の常用時及び非常時の初期ＬＥＤ電圧を記憶するようにしたが、いずれか一方を記憶するようにしてもよい。例えば、常用時の初期ＬＥＤ電圧を記憶した場合には、非常時に流れる電流に応じて非常時の初期ＬＥＤ電圧を求めることができる。逆に、非常時の初期ＬＥＤ電圧を記憶した場合には、常用時に流れる電流に応じて常用時の初期ＬＥＤ電圧を求めることができる。   In the above description, the reference value setting unit 17 of the microcomputer 15 stores the initial LED voltage during normal use and emergency of the constant current LED series circuit 13 and the constant voltage LED series circuit 14. You may make it memorize | store. For example, when the initial LED voltage during normal use is stored, the initial LED voltage during emergency can be obtained according to the current flowing during emergency. On the other hand, when the initial LED voltage in emergency is stored, the initial LED voltage in normal use can be obtained according to the current flowing during normal use.

ここで、商用電源１８からの交流電力を整流した直流電力が供給されている常用時と、バッテリ２４からの直流電力が供給されている異常時とでは、ＬＥＤ直列回路１３、１４の供給される点灯電力は異なる。常用時は通常の点灯電力が供給され、非常時は通常の点灯電力より小さい点灯電力が供給される。そこで、異常検知部１６は、常用時と非常時とで異常状態の検出レベルを変えてＬＥＤの異常判定を行うようにしてもよい。この場合は、より適切にＬＥＤの異常検出を行うことができる。   Here, the LED series circuits 13 and 14 are supplied during normal use when DC power obtained by rectifying AC power from the commercial power supply 18 is supplied and during abnormal conditions when DC power from the battery 24 is supplied. Lighting power is different. Normal lighting power is supplied during normal use, and lighting power smaller than normal lighting power is supplied during an emergency. Therefore, the abnormality detection unit 16 may determine the abnormality of the LED by changing the detection level of the abnormal state between normal use and emergency. In this case, it is possible to detect the abnormality of the LED more appropriately.

このように、定電流ＬＥＤ直列回路１３及び定電圧ＬＥＤ直列回路１４の初期ＬＥＤ電圧を基準にしてＬＥＤの異常状態を検出するので、ＬＥＤのバラツキによりＬＥＤ順電圧が異なった場合であっても、ＬＥＤの異常検出をより正確に行うことができる。また、常用時と非常時とで異常状態の検出レベルを変えることにより、より適切にＬＥＤの異常検出を行うことができる。   Thus, since the abnormal state of the LED is detected on the basis of the initial LED voltage of the constant current LED series circuit 13 and the constant voltage LED series circuit 14, even if the LED forward voltage is different due to LED variation, LED abnormality can be detected more accurately. Further, by changing the detection level of the abnormal state between normal use and emergency, it is possible to detect the abnormality of the LED more appropriately.

図３は本発明の実施の形態に係わる表示装置の斜視図である。図３では、非常口への誘導を行う誘導灯である場合を示している。器具本体３４には図１に示したＬＥＤ点灯装置が収納されている。器具本体３４の上面部や背面部のほぼ中央には、図示省略の電源穴や取付用穴が設けられ、電源穴を通して商用電源から電力を供給する電源線が器具本体３４内に引き込まれる。   FIG. 3 is a perspective view of the display device according to the embodiment of the present invention. In FIG. 3, the case where it is a guide light which guides to an emergency exit is shown. The instrument main body 34 houses the LED lighting device shown in FIG. A power supply hole and a mounting hole (not shown) are provided at substantially the center of the upper surface portion and the rear surface portion of the instrument main body 34, and a power supply line for supplying power from a commercial power source is drawn into the instrument main body 34 through the power supply hole.

そして、器具本体３４に収納されたＬＥＤ点灯装置に電源が供給され、器具本体３４内に引き込まれた商用電源からの電源線は端子台２４に接続され、この端子台２４から器具本体３４内の各要素、例えば点灯ユニット２０やバッテリー２１、さらには後述の光源部のＬＥＤに電力が供給される。ＬＥＤ点灯装置のＬＥＤを点灯するとともにバッテリに電力を充電する。一方、商用電源が停電したときにはバッテリからＬＥＤに電力を供給する。   Then, power is supplied to the LED lighting device housed in the instrument main body 34, and a power line from a commercial power source drawn into the instrument main body 34 is connected to the terminal block 24. Electric power is supplied to each element, for example, the lighting unit 20 and the battery 21, and further the LED of the light source section described later. The LED of the LED lighting device is turned on and the battery is charged with electric power. On the other hand, when the commercial power supply fails, power is supplied from the battery to the LEDs.

器具本体３４の前面部には、表示板３５が配置され、表示板３５の背面部からＬＥＤ点灯装置のＬＥＤからの光が照射される。これにより、表示板３５に描かれた図形や文字等を照明表示することになる。図３では、表示板３５に非常口に案内する図柄が描かれているものを示している。   A display plate 35 is disposed on the front surface of the instrument body 34, and light from the LEDs of the LED lighting device is irradiated from the back surface of the display plate 35. As a result, the figures, characters, etc. drawn on the display board 35 are illuminated and displayed. FIG. 3 shows the display board 35 on which a symbol for guiding the emergency exit is drawn.

誘導灯においては必要輝度は法的に定められているため、ＬＥＤに異常があり輝度が低減した場合はＬＥＤの異常を報知する必要があるが、図１に示したＬＥＤ点灯装置を採用すると、マイコン１５の異常検知部１６により検知できるのでＬＥＤの異常を適切に報知できる。   In the guide light, the required brightness is legally determined, so when there is an abnormality in the LED and the brightness is reduced, it is necessary to notify the abnormality of the LED, but when the LED lighting device shown in FIG. 1 is adopted, Since the abnormality detection unit 16 of the microcomputer 15 can detect the abnormality, the abnormality of the LED can be appropriately notified.

本発明の実施の形態に係わるＬＥＤ点灯装置の構成図。The block diagram of the LED lighting device concerning embodiment of this invention. 本発明の実施の形態におけるマイコンによる基準値設定部への初期ＬＥＤ電圧の記憶及び閾値設定部への閾値の設定の手順を示すフローチャート。The flowchart which shows the procedure of the memory | storage of the initial LED voltage to the reference value setting part by the microcomputer in embodiment of this invention, and the setting of the threshold value to a threshold value setting part. 本発明の実施の形態に係わる表示装置の斜視図。1 is a perspective view of a display device according to an embodiment of the present invention.

符号の説明Explanation of symbols

１１…電源装置、１２…定電流発生部、１３…定電流ＬＥＤ直列回路、１４…定電圧ＬＥＤ直列回路、１５…マイコン、１６…異常検知部、１７…基準位置設定部、１８…商用電源、１９…整流回路、２０…ＩＰＤ、２１…トランス、２２…常用時直流電源、２３…非常時直流電源、２４…バッテリ、２５…充電制御回路、２６…電源監視回路、２７…点灯制御回路、２８…制御ＩＣ、２９…ＬＥＤ、３０…直列回路、３１…直列回路、３２…直列回路、３３…直列回路、３４…器具本体、３５…表示板、３６…閾値設定部 DESCRIPTION OF SYMBOLS 11 ... Power supply device, 12 ... Constant current generation part, 13 ... Constant current LED series circuit, 14 ... Constant voltage LED series circuit, 15 ... Microcomputer, 16 ... Abnormality detection part, 17 ... Reference position setting part, 18 ... Commercial power supply, DESCRIPTION OF SYMBOLS 19 ... Rectifier circuit, 20 ... IPD, 21 ... Transformer, 22 ... Regular use DC power supply, 23 ... Emergency DC power supply, 24 ... Battery, 25 ... Charge control circuit, 26 ... Power supply monitoring circuit, 27 ... Lighting control circuit, 28 Control IC, 29 LED, 30 Series circuit, 31 Series circuit, 32 Series circuit, 33 Series circuit, 34 Instrument body, 35 Display panel, 36 Threshold setting unit

Claims (5)

複数のＬＥＤが直列接続されたＬＥＤ直列回路に点灯用電力を供給する電源装置と；
前記電源装置からの電源に基づいて直流の定電流を発生させる定電流発生部と；
前記定電流発生部からの定電流が初期に前記ＬＥＤ直列回路に供給されたときの初期ＬＥＤ電圧を記憶する基準値設定部と；
前記基準値設定部に記憶された初期ＬＥＤ電圧を基準にしてＬＥＤ直列回路の異常状態を判断する閾値を設定する閾値設定部と；
前記ＬＥＤ直列回路の異常状態を閾値設定部の閾値に基づいて検出する異常検知部と；
を備えたことを特徴とするＬＥＤ点灯装置。 A power supply device that supplies lighting power to an LED series circuit in which a plurality of LEDs are connected in series;
A constant current generator for generating a DC constant current based on a power source from the power supply device;
A reference value setting unit for storing an initial LED voltage when a constant current from the constant current generating unit is initially supplied to the LED series circuit;
A threshold value setting unit for setting a threshold value for determining an abnormal state of the LED series circuit based on the initial LED voltage stored in the reference value setting unit;
An abnormality detection unit that detects an abnormal state of the LED series circuit based on a threshold value of a threshold setting unit;
An LED lighting device comprising: 前記ＬＥＤ直列回路は２並列以上に並列接続され、２並列以上の前記ＬＥＤ直列回路のうちの一つは、前記定電流発生部からの定電流制御により点灯される定電流ＬＥＤ直列回路であり、残りのＬＥＤ直列回路は前記定電流ＬＥＤ直列回路の両端電圧が印加されて点灯される定電圧ＬＥＤ直列回路であり、前記異常検知部は、前記定電流ＬＥＤ直列回路の異常は前記定電流ＬＥＤ直列回路の両端電圧に基づいて検出し、前記定電圧ＬＥＤ直列回路の異常は前記定電圧ＬＥＤ直列回路の限流抵抗の電流に基づいて検出することを特徴とする請求項１記載のＬＥＤ点灯装置。   The LED series circuits are connected in parallel in two or more parallels, and one of the LED series circuits in two or more parallels is a constant current LED series circuit that is lit by constant current control from the constant current generator, The remaining LED series circuit is a constant voltage LED series circuit that is turned on by applying a voltage across the constant current LED series circuit, and the abnormality detection unit detects that the constant current LED series circuit is abnormal. The LED lighting device according to claim 1, wherein the LED lighting device is detected based on a voltage across the circuit, and an abnormality of the constant voltage LED series circuit is detected based on a current of a current limiting resistor of the constant voltage LED series circuit. 前記電源装置は、常用時には商用電源を直流に変換してバッテリに充電するとともにＬＥＤに点灯用電力を供給し、商用電源が停電した非常時にはバッテリからＬＥＤに点灯用電力を供給するものであり、前記異常検知部は、常用時と非常時とで異常状態の検出レベルを変えることを特徴とする請求項１または２記載のＬＥＤ点灯装置。   The power supply device converts the commercial power source into direct current during normal use, charges the battery and supplies lighting power to the LED, and supplies the lighting power from the battery to the LED in an emergency when the commercial power source fails. The LED lighting device according to claim 1, wherein the abnormality detection unit changes a detection level of an abnormal state between normal use and emergency. 前記閾値設定部は、常用時又は非常時のいずれか一方の初期ＬＥＤ電圧によりいずれか一方の閾値を設定すると他方の閾値も自動的に設定されることを特徴とする請求項３記載のＬＥＤ点灯装置。   4. The LED lighting according to claim 3, wherein the threshold value setting unit automatically sets the other threshold value by setting one of the threshold values according to one of the initial LED voltages during normal use or emergency. apparatus. 請求項１ないし４のいずれか一記載のＬＥＤ点灯装置と；
前記ＬＥＤを点灯制御するＬＥＤ点灯装置を収納する器具本体と；
前記器具本体の前面部に形成され前記導光板の出射面に設けられた表示板と；
を備えたことを特徴とする表示装置。 An LED lighting device according to any one of claims 1 to 4;
An instrument body that houses an LED lighting device that controls the lighting of the LED;
A display panel formed on the light emitting plate and formed on the front surface of the instrument body;
A display device comprising:
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CN109156073A (en) * 2016-03-25 2019-01-04 株式会社艾泰克*** The short-circuit method for detecting abnormality of the short-circuit abnormal detector of LED illumination System, the LED light device with the device and LED illumination System
CN109156073B (en) * 2016-03-25 2020-07-24 株式会社艾泰克*** L ED lighting system short circuit abnormity detection device and method, L ED lighting device
US10278258B2 (en) 2017-05-19 2019-04-30 Panasonic Intellectual Property Management Co., Ltd. Lighting device, luminaire, and signboard
JP2020087521A (en) * 2018-11-15 2020-06-04 パナソニックＩｐマネジメント株式会社 Lighting device, illumination device and emergency lighting system
JP7153873B2 (en) 2018-11-15 2022-10-17 パナソニックＩｐマネジメント株式会社 Lighting device, lighting device and emergency lighting system

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