JP2002008409A - Led light source device - Google Patents
Led light source deviceInfo
- Publication number
- JP2002008409A JP2002008409A JP2000182845A JP2000182845A JP2002008409A JP 2002008409 A JP2002008409 A JP 2002008409A JP 2000182845 A JP2000182845 A JP 2000182845A JP 2000182845 A JP2000182845 A JP 2000182845A JP 2002008409 A JP2002008409 A JP 2002008409A
- Authority
- JP
- Japan
- Prior art keywords
- led
- circuit
- series
- load
- light source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数個のＬＥＤを
発光素子として用いたＬＥＤ光源装置に関する。The present invention relates to an LED light source device using a plurality of LEDs as light emitting elements.
【０００２】[0002]
【従来の技術】発光ダイオード（以下ＬＥＤという）は
ＰＮ接合を有する半導体であり一種のダイオードとして
動作する。従って、順方向電圧は数ボルト以下と比較的
低く、その駆動用電源としては、３〜１５Ｖ程度の低電
圧の直流電源が用いられる。2. Description of the Related Art Light emitting diodes (hereinafter referred to as LEDs) are semiconductors having a PN junction and operate as a kind of diode. Therefore, the forward voltage is relatively low at several volts or less, and a DC power supply of a low voltage of about 3 to 15 V is used as a power supply for driving the same.
【０００３】近年、ＬＥＤの発光効率が高まり照明灯の
光源への応用が検討されてきている。現行の照明用ラン
プからの置き換えを考える場合、商用電源に接続できる
構成が望まれる。一般に、商用電源は５０〜６０Ｈｚの
交流であり、電圧も１００Ｖ〜２４２Ｖである。そこ
で、商用電源でＬＥＤを点灯する場合、抵抗器を電流制
限要素として用いた点灯回路が使用されている。[0003] In recent years, the luminous efficiency of LEDs has increased, and application to light sources of illumination lamps has been studied. In order to replace the current lighting lamp, a configuration that can be connected to a commercial power supply is desired. Generally, a commercial power supply is an alternating current of 50-60 Hz, and the voltage is also 100V-242V. Therefore, when lighting an LED with a commercial power supply, a lighting circuit using a resistor as a current limiting element is used.
【０００４】[0004]
【発明が解決しようとする課題】ところが、点灯回路に
抵抗器を使用した場合には、抵抗器での電力損失が大き
く、光源としてのエネルギー効率が悪い。また、交流電
源に接続した場合、ＬＥＤはダイオードであるので、交
流の半サイクルでしか発光せず、ちらつきになってしま
うという問題があった。電流制限要素としてコンデンサ
を使用した場合には、電力損失の問題は解決するが依然
として電流安定性は改善できない。However, when a resistor is used in the lighting circuit, the power loss in the resistor is large, and the energy efficiency as a light source is poor. Further, when connected to an AC power supply, since the LED is a diode, it emits light only in a half cycle of the AC, which causes a problem of flickering. When a capacitor is used as a current limiting element, the problem of power loss is solved, but current stability cannot be improved.
【０００５】そこで、特開平１１−６７４７１号公報に
示されるものでは、昇圧チョッパ回路の平滑コンデンサ
に、複数個のＬＥＤを直列接続した回路を２個並列接続
し、平滑コンデンサ電圧を入力電圧のピーク値より高
く、ＬＥＤの順方向電圧の総和に等しくしている。これ
により、入力電流の高調波を低減し、また電流限流要素
などの電力損失をほぼ零にしている。In Japanese Patent Application Laid-Open No. 11-67471, two circuits each having a plurality of LEDs connected in series are connected in parallel to the smoothing capacitor of the boost chopper circuit, and the smoothing capacitor voltage is set to the peak of the input voltage. Value and equal to the sum of the forward voltages of the LEDs. As a result, the harmonics of the input current are reduced, and the power loss of the current limiting element and the like is reduced to almost zero.
【０００６】しかし、ＬＥＤのうちの一つが短絡破壊し
た場合には、破壊したＬＥＤ直列回路の順方向電圧の総
和が小さくなり、この回路のみに短絡電流が流れること
になる。平滑電圧値が一定に制御されている場合には、
破壊したＬＥＤ直列回路には過大な電流が流れる。過電
流状態ではＬＥＤの温度は上昇し、発光効率を下げるこ
とはもちろん、ＬＥＤの寿命を短くすることも有り得
る。However, when one of the LEDs is short-circuited, the sum of the forward voltages of the broken LED series circuit becomes small, and short-circuit current flows only in this circuit. If the smoothed voltage value is controlled to be constant,
An excessive current flows through the broken LED series circuit. In the overcurrent state, the temperature of the LED rises, and the luminous efficiency may be lowered, and the life of the LED may be shortened.
【０００７】本発明の目的は、効率がよく安価でちらつ
きの少ないＬＥＤ光源装置を提供することである。It is an object of the present invention to provide an LED light source device which is efficient, inexpensive, and has little flicker.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明に係わる
ＬＥＤ光源装置は、複数個のＬＥＤが直列接続されたＬ
ＥＤ直列回路、または複数個のＬＥＤが逆並列接続され
たＬＥＤ逆並列回路を２並列以上接続して形成されたＬ
ＥＤ負荷と；ＬＥＤ負荷に電力を供給する電源部と；各
々のＬＥＤ直列回路またはＬＥＤ逆並列回路に直列接続
された回路要素と；前記回路要素の負担電圧がＬＥＤ直
列回路またはＬＥＤ逆並列回路のＬＥＤ列のフォワード
電圧よりも小さくなるように前記電源部を制御する制御
手段と；を備えたことを特徴とする。According to a first aspect of the present invention, there is provided an LED light source device comprising a plurality of LEDs connected in series.
L formed by connecting two or more ED series circuits or two or more LED antiparallel circuits in which a plurality of LEDs are connected in antiparallel.
An ED load; a power supply unit for supplying power to the LED load; a circuit element connected in series to each LED series circuit or LED anti-parallel circuit; And control means for controlling the power supply unit so as to be lower than the forward voltage of the LED string.
【０００９】本発明および以下の各発明において、特に
指定しない限り用語の定義および技術的意味は次によ
る。In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
【００１０】ＬＥＤ負荷とは、照明灯として形成された
ＬＥＤ回路であり、電源が投入されたときＬＥＤが発光
する。ＬＥＤ負荷は、直流電源用として、複数個のＬＥ
Ｄが直列接続されたＬＥＤ直列回路を２並列以上接続し
て形成される。また、交流電源用として、複数個のＬＥ
Ｄが逆並列接続されたＬＥＤ逆並列回路を２並列以上接
続して形成される。ＬＥＤ逆並列回路にはＬＥＤ直列回
路を逆並列接続されたものも含まれる。[0010] The LED load is an LED circuit formed as an illumination lamp, and the LED emits light when the power is turned on. LED load is used for DC power supply,
D is formed by connecting two or more LED series circuits connected in series. In addition, a plurality of LEs are used for AC power supply.
D is formed by connecting two or more LED antiparallel circuits connected in antiparallel. The LED anti-parallel circuit includes an LED serial circuit connected in anti-parallel.
【００１１】電源部とは、ＬＥＤ負荷に電力を供給する
電源およびその調整部であり、例えば、単相交流電源、
その単相交流電源に接続される全波整流回路、出力電圧
を調整制御する定電圧レギュレータから構成される。ま
た、単相交流電源、その単相交流電源に接続される全波
整流回路、定電流レギュレータから構成される。また、
単相交流電源および全波整流回路に代えて直流電源が用
いられる場合も含む。The power supply unit is a power supply for supplying power to the LED load and an adjustment unit thereof. For example, a single-phase AC power supply,
It is composed of a full-wave rectifier circuit connected to the single-phase AC power supply, and a constant voltage regulator for adjusting and controlling the output voltage. Further, it includes a single-phase AC power supply, a full-wave rectifier circuit connected to the single-phase AC power supply, and a constant current regulator. Also,
This includes the case where a DC power supply is used instead of the single-phase AC power supply and the full-wave rectifier circuit.
【００１２】定電圧レギュレータは、調整可能な一定電
圧を出力する。定電流レギュレータは、調整可能な一定
電流を出力する。定電圧レギュレータや定電流レギュレ
ータには、昇圧型定、降圧型、ハーフブリッジ型インバ
ータが含まれる。ハーフブリッジ型インバータは、ＬＥ
Ｄが逆並列接続されたＬＥＤ負荷に電源を供給する。[0012] The constant voltage regulator outputs an adjustable constant voltage. The constant current regulator outputs an adjustable constant current. Constant voltage regulators and constant current regulators include step-up type, step-down type, and half-bridge type inverters. Half-bridge type inverter is LE
D supplies power to the anti-parallel connected LED loads.
【００１３】回路要素は、定電流回路やインピーダンス
素子であり、インピーダンス素子には、抵抗器やリアク
トルが含まれる。The circuit elements are a constant current circuit and an impedance element. The impedance element includes a resistor and a reactor.
【００１４】定電流回路は入力電圧の大きさに関係なく
一定電流を流す回路であり、電源部が電圧レギュレータ
である場合にＬＥＤ直列回路またはＬＥＤ逆並列回路に
直列接続される。インピーダンス素子は入力電流に応じ
て逆電圧を発生する素子であり、電源部が電圧レギュレ
ータである場合に定電流回路に代えて直列接続され、電
源部が電流レギュレータである場合にＬＥＤ直列回路ま
たはＬＥＤ逆並列回路に直列接続される。The constant current circuit is a circuit for flowing a constant current irrespective of the magnitude of the input voltage, and is connected in series to an LED series circuit or an LED antiparallel circuit when the power supply is a voltage regulator. The impedance element is an element that generates a reverse voltage according to an input current. When the power supply is a voltage regulator, it is connected in series instead of a constant current circuit. When the power supply is a current regulator, an LED series circuit or an LED is connected. Connected in series to the anti-parallel circuit.
【００１５】制御手段は、電源部の出力電圧または出力
電流を制御する。この場合、回路要素の負担電圧がＬＥ
Ｄ直列回路またはＬＥＤ逆並列回路のＬＥＤ列のフォワ
ード電圧よりも小さくなるように制御する。これによ
り、回路要素での電力消費量はＬＥＤ列による電力消費
量より小さくなり効率が向上する。ＬＥＤフォワード電
圧とはＬＥＤが動作するに必要な最小電圧であり、ＬＥ
Ｄ直列回路またはＬＥＤ逆並列回路のＬＥＤ列のフォワ
ード電圧とは、ＬＥＤ直列回路またはＬＥＤ逆並列回路
を形成するＬＥＤ列における各々のＬＥＤのフォワード
電圧の総和である。[0015] The control means controls the output voltage or output current of the power supply unit. In this case, the burden voltage of the circuit element is LE
Control is performed so as to be lower than the forward voltage of the LED string of the D series circuit or the LED antiparallel circuit. As a result, the power consumption of the circuit elements is smaller than the power consumption of the LED array, and the efficiency is improved. The LED forward voltage is the minimum voltage required for the LED to operate, and LE
The forward voltage of the LED strings in the D series circuit or the LED antiparallel circuit is the sum of the forward voltages of the LEDs in the LED strings forming the LED serial circuit or the LED antiparallel circuit.
【００１６】請求項２の発明に係わるＬＥＤ光源装置
は、請求項１の発明において、前記制御手段は、前記回
路要素の負担電圧が前記ＬＥＤ直列回路またはＬＥＤ逆
並列回路のＬＥＤ列のフォワード電圧の１／１０以下に
制御することを特徴とする。According to a second aspect of the present invention, in the LED light source device according to the first aspect of the present invention, the control means may be configured so that a burden voltage of the circuit element is a forward voltage of an LED string of the LED series circuit or the LED antiparallel circuit. It is characterized in that it is controlled to 1/10 or less.
【００１７】回路要素での電力消費量の低減のために
は、回路要素の負担電圧は小さい（実質的に零に近い
値）ほど望ましい。本発明では、電源変動、温度変化、
ＬＥＤ直列回路またはＬＥＤ逆並列回路によるばらつき
等を考慮して、ＬＥＤ直列回路またはＬＥＤ逆並列回路
のＬＥＤ列のフォワード電圧の１／１０以下としてい
る。In order to reduce the power consumption of the circuit element, it is desirable that the burden voltage on the circuit element is as small as possible (substantially close to zero). In the present invention, power fluctuation, temperature change,
In consideration of variations due to the LED series circuit or the LED anti-parallel circuit, the forward voltage is set to 1/10 or less of the LED array forward voltage of the LED series circuit or the LED anti-parallel circuit.
【００１８】請求項３の発明に係わるＬＥＤ光源装置
は、請求項１の発明において、前記制御手段は、前記回
路要素の負担電圧が最小値である前記ＬＥＤ直列回路ま
たはＬＥＤ逆並列回路における回路要素の負担電圧を実
質的に零に制御する。According to a third aspect of the present invention, in the LED light source device according to the first aspect of the present invention, the control means includes a circuit element in the LED series circuit or the LED antiparallel circuit in which a burden voltage of the circuit element is a minimum value. Is controlled to substantially zero.
【００１９】本発明では、各々のＬＥＤ直列回路または
ＬＥＤ逆並列回路における回路要素の負担電圧を監視
し、そのうちの最小値を検出する。そして、その最小値
のＬＥＤ直列回路またはＬＥＤ逆並列回路における回路
要素の負担電圧を零に制御する。これにより、回路要素
での電力消費量のさらなる低減が図れる。In the present invention, the burden voltage of the circuit element in each LED series circuit or LED antiparallel circuit is monitored, and the minimum value is detected. Then, the burden voltage of the circuit element in the LED series circuit or the LED antiparallel circuit of the minimum value is controlled to zero. Thereby, the power consumption of the circuit element can be further reduced.
【００２０】請求項４の発明に係わるＬＥＤ光源装置
は、複数個のＬＥＤが直列接続されたＬＥＤ直列回路、
または複数個のＬＥＤが逆並列接続されたＬＥＤ逆並列
回路を２並列以上接続して形成されたＬＥＤ負荷と；Ｌ
ＥＤ負荷に電力を供給する電源部と；前記電源部に指令
を出力してＬＥＤ負荷の負荷電流を制御する制御手段
と；各々のＬＥＤ直列回路またはＬＥＤ逆並列回路のＬ
ＥＤ列に直列接続された少なくとも１つの過電流遮断素
子と；を備えたことを特徴とする。According to a fourth aspect of the present invention, there is provided an LED light source device comprising: an LED series circuit in which a plurality of LEDs are connected in series;
Or an LED load formed by connecting two or more LED anti-parallel circuits in which a plurality of LEDs are connected in anti-parallel; L
A power supply unit for supplying power to the ED load; a control unit for outputting a command to the power supply unit to control a load current of the LED load;
And at least one overcurrent cutoff element connected in series to the ED column.
【００２１】過電流遮断素子は、ＬＥＤ直列回路または
ＬＥＤ逆並列回路のＬＥＤが短絡破壊して過電流が流れ
たときにその過電流を遮断する素子である。例えば、ガ
ラスヒューズ、パターンヒューズ、低電力抵抗器などが
用いられる。過電流遮断素子は、ＬＥＤ直列回路に対し
ては、直列接続されたＬＥＤ列に対して直列接続され、
また、ＬＥＤ逆並列回路に対しては、逆並列接続された
各々の直列接続部分のＬＥＤ列に対して直列接続され
る。The overcurrent interrupting element is an element for interrupting an overcurrent when an LED of the LED series circuit or the LED antiparallel circuit is short-circuited and an overcurrent flows. For example, a glass fuse, a pattern fuse, a low power resistor, or the like is used. The overcurrent cutoff element is connected in series to the LED string connected in series for the LED series circuit,
Further, with respect to the LED anti-parallel circuit, the LED strings at the respective serially connected portions connected in anti-parallel are connected in series.
【００２２】請求項５の発明に係わるＬＥＤ光源装置
は、請求項４の発明において、前記ＬＥＤ直列回路また
はＬＥＤ逆並列回路は１個または複数個の着脱可能なユ
ニットで形成され、前記ユニットはＬＥＤ列に直列接続
された少なくとも１個の過電流遮断素子を備えたことを
特徴とする。According to a fifth aspect of the present invention, in the LED light source device according to the fourth aspect, the LED series circuit or the LED anti-parallel circuit is formed of one or more detachable units, and the unit is an LED. It is characterized in that at least one overcurrent cutoff element connected in series to the column is provided.
【００２３】ＬＥＤ直列回路またはＬＥＤ逆並列回路
は、１個または複数個のユニットで構成される。ＬＥＤ
直列回路のユニットは、直列接続されたＬＥＤ列に対し
て少なくとも１個の過電流遮断素子が直列接続され、ま
た、ＬＥＤ逆並列回路のユニットは、逆並列接続された
各々の直列接続部分のＬＥＤ列に対して少なくとも１個
の過電流遮断素子が直列接続される。これにより、ＬＥ
Ｄが短絡破壊して過電流遮断素子が動作した場合に、ユ
ニット単位で取り替え可能とする。The LED series circuit or LED anti-parallel circuit is composed of one or a plurality of units. LED
The series circuit unit has at least one overcurrent cutoff element connected in series to the series-connected LED string, and the LED anti-parallel circuit unit has an LED in each series-connected portion connected in anti-parallel. At least one overcurrent cutoff element is connected in series to the column. Thereby, LE
When D is short-circuited and the overcurrent cutoff element is activated, it can be replaced in units.
【００２４】請求項６の発明に係わるＬＥＤ光源装置
は、請求項４の発明において、前記制御手段は、前記Ｌ
ＥＤ負荷に供給される負荷電流が予め定めた一定値にな
るように制御することを特徴とする。According to a sixth aspect of the present invention, in the LED light source device according to the fourth aspect of the present invention, the control means may include the L
It is characterized in that the load current supplied to the ED load is controlled to be a predetermined constant value.
【００２５】制御手段は、ＬＥＤ負荷の各々のＬＥＤ直
列回路またはＬＥＤ逆並列回路の負荷電流の合計値が予
め定めた一定値となるように制御する。これにより、Ｌ
ＥＤが短絡破壊したＬＥＤ列に対して並列数分の合計負
荷電流が流れることになり、ＬＥＤ短絡破壊時に過電流
遮断素子を確実に動作させる。The control means performs control so that the total value of the load current of each LED series circuit or LED anti-parallel circuit of the LED load becomes a predetermined constant value. Thus, L
The total load current for the parallel number of LEDs flows through the LED string in which the ED is short-circuited, and the overcurrent cutoff element is reliably operated when the LED is short-circuited.
【００２６】請求項７の発明に係わるＬＥＤ光源装置
は、請求項４の発明において、前記制御手段は、各々の
ＬＥＤ直列回路またはＬＥＤ逆並列回路の各ＬＥＤ列の
負荷電流のうちの最小値が予め定めた一定値になるよう
に前記ＬＥＤ負荷の負荷電流を制御することを特徴とす
る。According to a seventh aspect of the present invention, in the LED light source device according to the fourth aspect, the control means determines that a minimum value of a load current of each LED string of each LED series circuit or LED anti-parallel circuit is included. It is characterized in that the load current of the LED load is controlled so as to be a predetermined constant value.
【００２７】制御手段は、ＬＥＤ負荷の各ＬＥＤ列の負
荷電流の最小値が一定値になるように制御する。これに
より、負荷電流がほぼ零になる破壊していないＬＥＤ列
の電流を増やすように制御され、短絡破壊しているＬＥ
Ｄ列にはさらに大きな電流が流れることになるので過電
流遮断素子は確実に動作する。The control means controls the minimum value of the load current of each LED row of the LED load to a constant value. As a result, the load current is controlled to be almost zero, and the current of the unbroken LED string is controlled to be increased.
Since a larger current flows in the D column, the overcurrent cutoff element operates reliably.
【００２８】[0028]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。図１は本発明の第１の実施の形態に係わるＬＥＤ
光源装置の構成図である。Embodiments of the present invention will be described below. FIG. 1 shows an LED according to a first embodiment of the present invention.
It is a block diagram of a light source device.
【００２９】ＬＥＤ負荷１は、複数個のＬＥＤが直列接
続されたＬＥＤ直列回路２を２並列以上接続して形成さ
れている。また、ＬＥＤ負荷１の各々のＬＥＤ直列回路
２には回路要素３が直列接続されている。図１では、回
路要素３として定電流回路が直列接続されており、定電
流回路は各々のＬＥＤ直列回路２の入力電圧の大きさに
関係なく、そのＬＥＤ列に一定電流を流すことになる。The LED load 1 is formed by connecting two or more LED series circuits 2 in which a plurality of LEDs are connected in series. A circuit element 3 is connected in series to each LED series circuit 2 of the LED load 1. In FIG. 1, a constant current circuit is connected in series as the circuit element 3, and the constant current circuit flows a constant current through the LED array irrespective of the magnitude of the input voltage of each LED series circuit 2.
【００３０】このＬＥＤ負荷１には、単相交流電源４の
電源電圧を整流器５で整流し定電圧レギュレータ６で調
整された直流電圧が印加される。この定電圧レギュレー
タ６は昇圧チョッパ付きの昇圧型であり、制御手段７に
より制御され、ＬＥＤ負荷に供給する一定電圧を調整し
て出力する。比較手段８は、各々のＬＥＤ直列回路２の
回路要素３の負担電圧のうちの最小値を検出するもので
あり、その検出した最小値を制御手段７に出力する。A DC voltage adjusted by a rectifier 5 and adjusted by a constant voltage regulator 6 is applied to the LED load 1. The constant voltage regulator 6 is a step-up type with a step-up chopper, and is controlled by the control means 7 to adjust and output a constant voltage supplied to the LED load. The comparing means 8 detects the minimum value of the burden voltage of the circuit element 3 of each LED series circuit 2, and outputs the detected minimum value to the control means 7.
【００３１】制御手段７は、回路要素３の負担電圧がＬ
ＥＤ直列回路２のＬＥＤ列のフォワード電圧よりも小さ
くなるように定電圧レギュレータ６を制御する。この場
合、各々の回路要素３の負担電圧にはばらつきがあるの
で、比較手段８で検出された各々の回路要素３の入力電
圧のうちの最小値がＬＥＤ直列回路２のＬＥＤ列のフォ
ワード電圧よりも小さくなるように定電圧レギュレータ
６を制御する。The control means 7 determines that the burden voltage of the circuit element 3 is L
The constant voltage regulator 6 is controlled so as to be lower than the forward voltage of the LED string of the ED series circuit 2. In this case, since the burden voltage of each circuit element 3 varies, the minimum value of the input voltages of each circuit element 3 detected by the comparing means 8 is smaller than the forward voltage of the LED array of the LED series circuit 2. The constant voltage regulator 6 is controlled so as to reduce the voltage.
【００３２】これにより、回路要素３の負担電圧はＬＥ
Ｄ直列回路２の負担電圧より小さくなるので、ＬＥＤ発
光効率が向上する。Thus, the burden voltage of the circuit element 3 is LE
Since the voltage is lower than the burden voltage of the D series circuit 2, the LED light emission efficiency is improved.
【００３３】この場合、制御手段７は、回路要素３の負
担電圧がＬＥＤ直列回路２のＬＥＤ列のフォワード電圧
の１／１０以下になるように制御する。また、制御手段
７は、ＬＥＤ列のフォワード電圧が確立し各々のＬＥＤ
直列回路２が点灯したときは、回路要素３の負担電圧の
最小値を実質的に零に制御する。これにより、回路要素
３での電力消費量のさらなる低減が図れる。In this case, the control means 7 controls the burden voltage of the circuit element 3 so as to be 1/10 or less of the forward voltage of the LED array of the LED series circuit 2. Also, the control means 7 establishes the forward voltage of the LED string and
When the series circuit 2 is turned on, the minimum value of the burden voltage of the circuit element 3 is controlled to substantially zero. Thus, the power consumption of the circuit element 3 can be further reduced.
【００３４】図２は、本発明の第２の実施の形態に係わ
るＬＥＤ光源装置の説明図であり、図２（ａ）はその構
成図、図２（ｂ）は回路要素３の回路図である。この第
２の実施の形態は、図１に示した第１の実施の形態に対
し、定電圧レギュレータ６は昇圧チョッパに代えてトラ
ンスを設けた電圧レギュレータとしたものである。その
他の構成は、図１に示す第１の実施の形態と同一である
ので、同一要素には同一符号を付し重複する説明は省略
する。FIG. 2 is an explanatory view of an LED light source device according to a second embodiment of the present invention. FIG. 2 (a) is a configuration diagram thereof, and FIG. 2 (b) is a circuit diagram of a circuit element 3. is there. The second embodiment is different from the first embodiment shown in FIG. 1 in that the constant voltage regulator 6 is a voltage regulator provided with a transformer in place of the step-up chopper. The other configuration is the same as that of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and overlapping description will be omitted.
【００３５】回路要素３は、図３（ｂ）に示すように、
抵抗器Ｒ１、Ｒ２、トランジスタＴｒ、定電圧素子ＺＤ
から構成され、トランジスタＴｒに流れる電流（ＬＥＤ
列）は抵抗器Ｒ２に発生する電圧が定電圧値Ｖ０となる
値に一定制御される。この第２の実施の形態の場合も第
１の実施の形態と同様に、回路要素３で消費される電力
が低減できるので、ＬＥＤ発光効率が向上する。The circuit element 3 is, as shown in FIG.
Resistors R1, R2, transistor Tr, constant voltage element ZD
And the current flowing through the transistor Tr (LED
Column) is constantly controlled to a value at which the voltage generated at the resistor R2 becomes the constant voltage value V0. In the case of the second embodiment, similarly to the first embodiment, since the power consumed by the circuit element 3 can be reduced, the LED light emission efficiency is improved.
【００３６】図３は、本発明の第３の実施の形態に係わ
るＬＥＤ光源装置の構成図である。この第３の実施の形
態は、図１に示した第１の実施の形態に対し、単相交流
電源４に代えて直流電源９とし、定電圧レギュレータ６
に代えて定電流レギュレータ１０を設け、回路要素３と
して抵抗器を用いたものである。FIG. 3 is a configuration diagram of an LED light source device according to a third embodiment of the present invention. The third embodiment differs from the first embodiment shown in FIG. 1 in that a DC power supply 9 is used instead of the single-phase AC power supply 4 and a constant voltage regulator 6
Is provided with a constant current regulator 10 and a resistor is used as the circuit element 3.
【００３７】この定電流レギュレータ１０は降圧チョッ
パ付きの降圧型であり、制御手段７により制御され、Ｌ
ＥＤ負荷に供給する一定電流を調整して出力する。回路
素子３は各ＬＥＤ枝路のフォワード電圧のばらつきによ
る電流ばらつきを抑制するために設けられる。比較手段
８は、各々のＬＥＤ直列回路２の回路要素３の負担電圧
のうちの最小値を検出するものであり、その検出した最
小値を制御手段７に出力する。その他の構成は、図１に
示す第１の実施の形態と同一であるので、同一要素には
同一符号を付し重複する説明は省略する。The constant current regulator 10 is a step-down type with a step-down chopper, and is controlled by the control means 7 to
The constant current supplied to the ED load is adjusted and output. The circuit element 3 is provided to suppress a current variation due to a variation in the forward voltage of each LED branch. The comparing means 8 detects the minimum value of the burden voltage of the circuit element 3 of each LED series circuit 2, and outputs the detected minimum value to the control means 7. The other configuration is the same as that of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and overlapping description will be omitted.
【００３８】この第３の実施の形態の場合も第１の実施
の形態と同様に、回路要素３としての抵抗器で消費され
る電力が低減できるので、ＬＥＤ発光効率が向上する。In the case of the third embodiment, similarly to the first embodiment, the power consumed by the resistor as the circuit element 3 can be reduced, so that the LED luminous efficiency is improved.
【００３９】図４は、本発明の第４の実施の形態に係わ
るＬＥＤ光源装置の構成図である。この第４の実施の形
態は、図３に示した第３の実施の形態に対し、定電流レ
ギュレータ１０に代えてハーフブリッジ型インバータ１
１を設け、回路素子３としてリアクトル（コイル）を用
いたものである。また、ハーフブリッジ型インバータ１
１は高周波電源となることから、ＬＥＤ負荷１は、複数
個のＬＥＤが逆並列接続されたＬＥＤ逆並列回路１２を
２並列以上接続して形成される。その他の構成は、図３
に示す第３の実施の形態と同一であるので、同一要素に
は同一符号を付し重複する説明は省略する。FIG. 4 is a configuration diagram of an LED light source device according to a fourth embodiment of the present invention. This fourth embodiment is different from the third embodiment shown in FIG.
1 is used, and a reactor (coil) is used as the circuit element 3. Half-bridge type inverter 1
Since 1 is a high-frequency power supply, the LED load 1 is formed by connecting two or more LED anti-parallel circuits 12 in which a plurality of LEDs are connected in anti-parallel. Other configurations are shown in FIG.
Are the same as those of the third embodiment, and the same elements are denoted by the same reference numerals and overlapping description will be omitted.
【００４０】この第４の実施の形態の場合は、回路要素
３としてのリアクトルの負担電圧が最小値となる負荷電
流で動作するので、ＬＥＤ発光効率が向上する。In the case of the fourth embodiment, the operation as the load current at which the burden voltage of the reactor as the circuit element 3 becomes the minimum value is achieved, so that the LED light emission efficiency is improved.
【００４１】図５は、本発明の第５の実施の形態に係わ
るＬＥＤ光源装置の構成図である。この第５の実施の形
態は、各々のＬＥＤ直列回路２のＬＥＤ列に少なくとも
１つの過電流遮断素子１３を直列接続したものである。FIG. 5 is a configuration diagram of an LED light source device according to a fifth embodiment of the present invention. In the fifth embodiment, at least one overcurrent cutoff element 13 is connected in series to the LED string of each LED series circuit 2.
【００４２】ＬＥＤ負荷１は、複数個のＬＥＤが直列接
続されたＬＥＤ直列回路２を２並列以上接続して形成さ
れている。また、ＬＥＤ負荷１の各々のＬＥＤ直列回路
２には過電流遮断素子１３が直列接続されており、ＬＥ
Ｄ直列回路２のＬＥＤが短絡破壊して過電流が流れたと
きにその過電流を遮断する。また、電流制限素子として
の回路要素３が各々のＬＥＤ直列回路２をまとめて設け
られている。The LED load 1 is formed by connecting two or more LED series circuits 2 in which a plurality of LEDs are connected in series. Also, an overcurrent cutoff element 13 is connected in series to each LED series circuit 2 of the LED load 1,
When the LED of the D series circuit 2 is short-circuit broken and an overcurrent flows, the overcurrent is cut off. Further, a circuit element 3 as a current limiting element is provided for each LED series circuit 2 collectively.
【００４３】ここで、各々のＬＥＤ直列回路２は着脱可
能なユニットで形成され、このユニットには少なくとも
１個の過電流遮断素子１３を備えるようにする。これに
より、ＬＥＤが短絡故障した場合に、故障したＬＥＤを
含むＬＥＤ直列回路２を交換できるようにしている。Here, each LED series circuit 2 is formed as a detachable unit, and this unit is provided with at least one overcurrent cutoff element 13. Thus, when a short-circuit fault occurs in the LED, the LED series circuit 2 including the faulty LED can be replaced.
【００４４】ＬＥＤ負荷１には、単相交流電源４の電源
電圧を整流器５で整流し定電圧レギュレータ６で調整さ
れた直流電圧が印加される。この定電圧レギュレータ６
は昇圧チョッパ付きの昇圧型であり、制御手段７により
制御され、ＬＥＤ負荷１に供給する一定電圧を調整して
出力する。すなわち、制御手段７はＬＥＤ負荷１の全体
に流れる全負荷電流を電流検出手段１４で検出し、ＬＥ
Ｄ負荷１の全負荷電流が一定値になるように制御する。A DC voltage adjusted by a rectifier 5 and adjusted by a constant voltage regulator 6 is applied to the LED load 1. This constant voltage regulator 6
Is a step-up type with a step-up chopper, which is controlled by the control means 7 to adjust and output a constant voltage supplied to the LED load 1. That is, the control means 7 detects the total load current flowing through the entire LED load 1 with the current detection means 14, and
Control is performed so that the total load current of the D load 1 becomes a constant value.
【００４５】従って、ＬＥＤが短絡破壊したＬＥＤ直列
回路２がある場合には、その短絡破壊したＬＥＤ直列回
路２のＬＥＤ列に対して並列数分の合計負荷電流が流れ
ることになり、そのＬＥＤ列に直列接続された過電流遮
断素子１３を確実に動作させる。Therefore, when there is an LED series circuit 2 in which an LED is short-circuited and destroyed, a total load current of the number of parallel circuits flows through the LED series of the LED series circuit 2 in which the short-circuit is destroyed. The overcurrent cutoff element 13 connected in series to the device is reliably operated.
【００４６】このように、短絡破壊の生じたＬＥＤ直列
回路を過電流遮断素子１３により遮断するので、破壊し
たＬＥＤ直列回路には過大な電流が流れることを防止で
き、ＬＥＤの温度上昇や発光効率を下降を防止できる。As described above, since the LED series circuit in which short-circuit breakdown has occurred is interrupted by the overcurrent cutoff element 13, an excessive current can be prevented from flowing through the broken LED series circuit, and the temperature rise and the luminous efficiency of the LED can be prevented. The fall can be prevented.
【００４７】図６は、本発明の第６の実施の形態に係わ
るＬＥＤ光源装置の構成図である。この第６の実施の形
態は、図５に示した第５の実施の形態に対し、定電圧レ
ギュレータ６に代えて定電流レギュレータ１０を設け、
各々のＬＥＤ直列回路２を複数個（図６では２個）の着
脱可能なユニットで形成し、このユニットに少なくとも
１個の過電流遮断素子１３を備えるようにしたものであ
る。FIG. 6 is a configuration diagram of an LED light source device according to a sixth embodiment of the present invention. The sixth embodiment differs from the fifth embodiment shown in FIG. 5 in that a constant current regulator 10 is provided in place of the constant voltage regulator 6,
Each LED series circuit 2 is formed of a plurality (two in FIG. 6) of detachable units, and this unit is provided with at least one overcurrent cutoff element 13.
【００４８】ＬＥＤ負荷１には、単相交流電源４の電源
電圧を整流器５で整流し定電流レギュレータ１０で調整
された直流電流が印加される。この定電流レギュレータ
１０は、制御手段７により制御され、ＬＥＤ負荷１に供
給する一定電流を調整して出力する。すなわち、制御手
段７はＬＥＤ負荷１の全体に流れる全負荷電流を電流検
出手段１４で検出し、ＬＥＤ負荷１の全負荷電流が一定
値になるように制御する。The LED load 1 is supplied with a DC current which is rectified by the rectifier 5 from the power supply voltage of the single-phase AC power supply 4 and adjusted by the constant current regulator 10. The constant current regulator 10 is controlled by the control means 7, and adjusts and outputs a constant current supplied to the LED load 1. That is, the control means 7 detects the total load current flowing through the entire LED load 1 by the current detecting means 14 and controls the total load current of the LED load 1 to be a constant value.
【００４９】従って、ＬＥＤが短絡破壊したＬＥＤ直列
回路２がある場合には、その短絡破壊したＬＥＤ直列回
路２のＬＥＤ列に対して並列数分の合計負荷電流が流れ
ることになり、そのＬＥＤ列に直列接続された過電流遮
断素子１３を確実に動作させる。これにより、短絡破壊
の生じたＬＥＤ直列回路２を過電流遮断素子１３により
遮断できるので、破壊したＬＥＤ直列回路には過大な電
流が流れることを防止でき、ＬＥＤの温度上昇や発光効
率を下降を防止できる。Accordingly, when there is an LED series circuit 2 in which an LED is short-circuited and destroyed, a total load current of the number of parallel circuits flows through the LED series of the LED series circuit 2 in which the short-circuit is destroyed. The overcurrent cutoff element 13 connected in series to the device is reliably operated. As a result, the LED series circuit 2 in which the short-circuit breakdown has occurred can be cut off by the overcurrent cutoff element 13, so that an excessive current can be prevented from flowing through the broken LED series circuit, and the LED temperature rise and the luminous efficiency decrease. Can be prevented.
【００５０】図７は、本発明の第７の実施の形態に係わ
るＬＥＤ光源装置の構成図である。この第７の実施の形
態は、図６に示した第６の実施の形態に対し、定電流レ
ギュレータ１０に代えてハーフブリッジ型インバータ１
１を設け、ハーフブリッジ型インバータ１１は高周波電
源となることから、ＬＥＤ負荷１は、複数個のＬＥＤが
逆並列接続されたＬＥＤ逆並列回路１２を２並列以上接
続して形成したものである。また、各々のＬＥＤ並列回
路１２のＬＥＤ列に電流検出手段１４を設け、制御手段
７は、各々のＬＥＤ並列回路１２のＬＥＤ列の負荷電流
のうちの最小値が予め定めた一定値になるようにＬＥＤ
負荷１の負荷電流を制御するようにしている。FIG. 7 is a configuration diagram of an LED light source device according to a seventh embodiment of the present invention. The seventh embodiment differs from the sixth embodiment shown in FIG.
1 and the half-bridge inverter 11 is a high-frequency power supply, so the LED load 1 is formed by connecting two or more LED anti-parallel circuits 12 in which a plurality of LEDs are connected in anti-parallel. In addition, the current detecting means 14 is provided for the LED strings of each LED parallel circuit 12, and the control means 7 controls the minimum value of the load current of the LED strings of each LED parallel circuit 12 to be a predetermined constant value. LED
The load current of the load 1 is controlled.
【００５１】このことから、負荷電流がほぼ零になる破
壊していないＬＥＤ列の電流を増やすことになる。従っ
て、短絡破壊しているＬＥＤ列にはさらに大きな電流が
流れることになるので、そのＬＥＤ列に直列接続された
過電流遮断素子１３は確実に動作する。From this, the current of the unbroken LED string at which the load current becomes almost zero is increased. Therefore, a larger current flows through the LED string that has been short-circuited, and the overcurrent cutoff element 13 connected in series to the LED string operates reliably.
【００５２】[0052]
【発明の効果】以上述べたように、本発明によれば、各
ＬＥＤ直列回路またはＬＥＤ逆並列回路によるフォワー
ド電圧のばらつきなどがあっても、各ＬＥＤ直列回路ま
たはＬＥＤ逆並列回路のＬＥＤ電流を安定としながら、
回路要素での電流損失を最小限にできる。As described above, according to the present invention, the LED current of each LED series circuit or LED anti-parallel circuit is reduced even if the forward voltage varies due to each LED series circuit or LED anti-parallel circuit. While keeping it stable
Current loss in circuit elements can be minimized.
【００５３】また、各ＬＥＤ直列回路またはＬＥＤ逆並
列回路のＬＥＤ列の直列に電流遮断素子を接続するの
で、ＬＥＤが短絡故障した場合にその短絡故障したＬＥ
Ｄ列を除去できる。Further, since the current cutoff element is connected in series with the LED string of each LED series circuit or LED antiparallel circuit, when a short circuit fault occurs in the LED, the short-circuited LE
Column D can be eliminated.
【図１】本発明の第１の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 1 is a configuration diagram of an LED light source device according to a first embodiment of the present invention.
【図２】本発明の第２の実施の形態に係わるＬＥＤ光源
装置の説明図。FIG. 2 is an explanatory diagram of an LED light source device according to a second embodiment of the present invention.
【図３】本発明の第３の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 3 is a configuration diagram of an LED light source device according to a third embodiment of the present invention.
【図４】本発明の第４の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 4 is a configuration diagram of an LED light source device according to a fourth embodiment of the present invention.
【図５】本発明の第５の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 5 is a configuration diagram of an LED light source device according to a fifth embodiment of the present invention.
【図６】本発明の第６の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 6 is a configuration diagram of an LED light source device according to a sixth embodiment of the present invention.
【図７】本発明の第７の実施の形態に係わるＬＥＤ光源
装置の構成図。FIG. 7 is a configuration diagram of an LED light source device according to a seventh embodiment of the present invention.
１…ＬＥＤ負荷、２…ＬＥＤ直列回路、３…回路要素、
４…単相交流電源、５…整流器、６…定電圧レギュレー
タ、７…制御手段、８…比較手段、９…直流電源、１０
…定電流レギュレータ、１１…ハーフブリッジ型インバ
ータ、１２…ＬＥＤ逆並列回路、１３…過電流遮断素
子、１４…電流検出手段1 LED load, 2 LED series circuit, 3 circuit element,
4 single-phase AC power supply, 5 rectifier, 6 constant voltage regulator, 7 control means, 8 comparison means, 9 DC power supply, 10
... constant current regulator, 11 ... half-bridge type inverter, 12 ... LED anti-parallel circuit, 13 ... overcurrent cutoff element, 14 ... current detection means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 笹井 敏彦 東京都品川区東品川四丁目３番１号 東芝 ライテック株式会社内 (72)発明者 三田 一敏 東京都品川区東品川四丁目３番１号 東芝 ライテック株式会社内 (72)発明者 高橋 雄治 東京都品川区東品川四丁目３番１号 東芝 ライテック株式会社内 (72)発明者 松本 晋一郎 東京都品川区東品川四丁目３番１号 東芝 ライテック株式会社内 (72)発明者 小塚 日出夫 東京都品川区東品川四丁目３番１号 東芝 ライテック株式会社内 Ｆターム(参考） 3K073 AA27 AA83 AA87 BA03 BA10 BA13 CF10 CJ13 CJ17 CL14 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihiko Sasai 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (72) Inventor Kazutoshi Mita 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo No. Toshiba Lighting & Technology Corporation (72) Inventor Yuji Takahashi 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting-Tech Corporation (72) Inventor Shinichiro Matsumoto 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Inside Litetech Co., Ltd. (72) Inventor Hideo Kozuka 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighttech Corporation F-term (reference) 3K073 AA27 AA83 AA87 BA03 BA10 BA13 CF10 CJ13 CJ17 CL14
Claims (7)
直列回路、または複数個のＬＥＤが逆並列接続されたＬ
ＥＤ逆並列回路を２並列以上接続して形成されたＬＥＤ
負荷と；ＬＥＤ負荷に電力を供給する電源部と；各々の
ＬＥＤ直列回路またはＬＥＤ逆並列回路に直列接続され
た回路要素と；前記回路要素の負担電圧がＬＥＤ直列回
路またはＬＥＤ逆並列回路のＬＥＤ列のフォワード電圧
よりも小さくなるように前記電源部を制御する制御手段
と；を備えたことを特徴とするＬＥＤ光源装置。An LED in which a plurality of LEDs are connected in series
A series circuit or L in which a plurality of LEDs are connected in anti-parallel
LED formed by connecting two or more ED antiparallel circuits
A power supply unit for supplying power to the LED load; a circuit element connected in series to each LED series circuit or LED anti-parallel circuit; and a load voltage of the circuit element being an LED of the LED series circuit or the LED anti-parallel circuit. Control means for controlling the power supply unit so as to be lower than a forward voltage of a column.
圧が前記ＬＥＤ直列回路またはＬＥＤ逆並列回路のＬＥ
Ｄ列のフォワード電圧の１／１０以下に制御することを
特徴とする請求項１に記載のＬＥＤ光源装置。2. The control means according to claim 1, wherein a burden voltage of said circuit element is an LE of said LED series circuit or LED anti-parallel circuit.
2. The LED light source device according to claim 1, wherein the LED light source device is controlled to be 1/10 or less of a forward voltage of the D column.
圧が最小値である前記ＬＥＤ直列回路またはＬＥＤ逆並
列回路における回路要素の負担電圧を実質的に零に制御
することを特徴とする請求項１に記載のＬＥＤ光源装
置。3. The control means controls the burden voltage of the circuit element in the LED series circuit or the LED antiparallel circuit having the minimum burden voltage of the circuit element to substantially zero. Item 2. The LED light source device according to item 1.
直列回路、または複数個のＬＥＤが逆並列接続されたＬ
ＥＤ逆並列回路を２並列以上接続して形成されたＬＥＤ
負荷と；ＬＥＤ負荷に電力を供給する電源部と；前記電
源部に指令を出力してＬＥＤ負荷の負荷電流を制御する
制御手段と；各々のＬＥＤ直列回路またはＬＥＤ逆並列
回路のＬＥＤ列に直列接続された少なくとも１つの過電
流遮断素子と；を備えたことを特徴とするＬＥＤ光源装
置。4. An LED in which a plurality of LEDs are connected in series
A series circuit or L in which a plurality of LEDs are connected in anti-parallel
LED formed by connecting two or more ED antiparallel circuits
A power supply unit for supplying power to the LED load; a control unit for outputting a command to the power supply unit to control a load current of the LED load; and serially connected to each LED series circuit or the LED string of the LED antiparallel circuit. An LED light source device comprising: at least one overcurrent cutoff element connected to the LED light source device.
回路は１個または複数個の着脱可能なユニットで形成さ
れ、前記ユニットはＬＥＤ列に直列接続された少なくと
も１個の過電流遮断素子を備えたことを特徴とする請求
項４に記載のＬＥＤ光源装置。5. The LED series circuit or the LED anti-parallel circuit is formed of one or more detachable units, and the unit includes at least one overcurrent cutoff element connected in series to the LED string. The LED light source device according to claim 4, wherein:
される負荷電流が予め定めた一定値になるように制御す
ることを特徴とする請求項４に記載のＬＥＤ光源装置。6. The LED light source device according to claim 4, wherein the control unit controls the load current supplied to the LED load to be a predetermined constant value.
またはＬＥＤ逆並列回路のＬＥＤ列の負荷電流のうちの
最小値が予め定めた一定値になるように前記ＬＥＤ負荷
の負荷電流を制御することを特徴とする請求項４に記載
のＬＥＤ光源装置。7. The control means controls the load current of the LED load such that the minimum value of the load current of the LED string of each LED series circuit or LED anti-parallel circuit becomes a predetermined constant value. The LED light source device according to claim 4, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000182845A JP4461576B2 (en) | 2000-06-19 | 2000-06-19 | LED light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000182845A JP4461576B2 (en) | 2000-06-19 | 2000-06-19 | LED light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002008409A true JP2002008409A (en) | 2002-01-11 |
| JP4461576B2 JP4461576B2 (en) | 2010-05-12 |
Family
ID=18683523
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000182845A Expired - Fee Related JP4461576B2 (en) | 2000-06-19 | 2000-06-19 | LED light source device |
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| Country | Link |
|---|---|
| JP (1) | JP4461576B2 (en) |
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