JP6244971B2 - Lighting device and lighting apparatus - Google Patents

Lighting device and lighting apparatus Download PDF

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JP6244971B2
JP6244971B2 JP2014032004A JP2014032004A JP6244971B2 JP 6244971 B2 JP6244971 B2 JP 6244971B2 JP 2014032004 A JP2014032004 A JP 2014032004A JP 2014032004 A JP2014032004 A JP 2014032004A JP 6244971 B2 JP6244971 B2 JP 6244971B2
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voltage
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power supply
load
detection
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JP2015158983A (en
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西川　弘明
弘明 西川
工 飯島
工 飯島
陽 山上
陽 山上
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Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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Mitsubishi Electric Lighting Corp
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Description

本発明は、点灯装置および照明器具に関する。   The present invention relates to a lighting device and a lighting fixture.

従来、例えば特開２０１２−１６０３２２号公報に開示されているように、例えば４５Ｖ〜９５Ｖの範囲内で負荷電圧が互いに異なる複数のＬＥＤモジュールを点灯可能な点灯装置が知られている。負荷異常を検出してＬＥＤランプ点灯装置に保護動作をさせる技術が公知である。一般的には、電源回路の出力電圧を監視して負荷異常を検出する場合、閾値を設定しておき、出力電圧がこの閾値を逸脱したときに異常であると判定する。上記従来技術にかかる点灯装置は、点灯時の負荷電圧をモニタして閾値を都度適切な値に可変するようにしている。このようにすることで、点灯条件の変化に対応して閾値を都度適切な値に追随させることができる。   Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-160322, there is known a lighting device capable of lighting a plurality of LED modules having different load voltages within a range of 45 V to 95 V, for example. A technique for detecting an abnormal load and causing the LED lamp lighting device to perform a protective operation is known. In general, when a load abnormality is detected by monitoring the output voltage of a power supply circuit, a threshold is set, and it is determined that an abnormality occurs when the output voltage deviates from this threshold. The lighting device according to the above-described prior art monitors the load voltage at the time of lighting and varies the threshold value to an appropriate value each time. By doing in this way, a threshold value can be made to follow an appropriate value each time according to change of lighting conditions.

特開２０１２−１６０３２２号公報JP 2012-160322 A

しかしながら、上記従来の点灯装置では、点灯時におけるＬＥＤモジュールの負荷電圧が異なると、これに応じて、電源回路の出力電圧判定のための閾値（すなわち保護閾値電圧）そのものを可変させている。しかしながら、保護閾値電圧を変化させる範囲は、制御回路の電源電圧によって制約を受けてしまう。その結果、対応可能な負荷電圧の範囲を広くとることが難しいという問題があった。   However, in the above-described conventional lighting device, if the load voltage of the LED module at the time of lighting is different, the threshold value for determining the output voltage of the power supply circuit (that is, the protection threshold voltage) itself is varied accordingly. However, the range in which the protection threshold voltage is changed is limited by the power supply voltage of the control circuit. As a result, there is a problem that it is difficult to widen the range of load voltages that can be handled.

本発明は、上述のような課題を解決するためになされたもので、広範囲の負荷電圧に対応しつつ保護動作を適切に実行することのできる点灯装置および照明器具を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device and a lighting fixture that can appropriately perform a protection operation while supporting a wide range of load voltages. .

本発明にかかる点灯装置は、電源と接続して直流電圧を出力する入力側電源回路と、入力側電源回路からの直流電圧が入力され、発光素子と接続する出力端子を有し、前記出力端子を介して前記発光素子に直流電流を供給する出力側電源回路と、前記出力端子の負荷電圧を検出する負荷電圧検出回路と、入力信号を受け、前記負荷電圧を前記入力信号に応じて異なる大きさの電圧に変換し、保護電圧として出力する検出電圧可変回路と、前記直流電圧の最大値が大きいほど前記負荷電圧を小さな値に変換させるように前記入力信号を前記検出電圧可変回路に与え、前記保護電圧の大きさに基づいて保護動作を行う制御回路と、を備える。   The lighting device according to the present invention has an input-side power supply circuit that outputs a DC voltage when connected to a power supply, and an output terminal that receives a DC voltage from the input-side power supply circuit and is connected to a light emitting element. An output-side power supply circuit that supplies a direct current to the light emitting element via a load voltage detection circuit that detects a load voltage of the output terminal, receives an input signal, and the load voltage varies according to the input signal A detection voltage variable circuit that converts the voltage into a voltage and outputs it as a protection voltage, and gives the input signal to the detection voltage variable circuit so that the load voltage is converted to a smaller value as the maximum value of the DC voltage is larger, And a control circuit that performs a protection operation based on the magnitude of the protection voltage.

本発明にかかる照明器具は、発光素子と、前記発光素子を点灯させる点灯装置と、を備える。前記点灯装置は、電源と接続して直流電圧を出力する入力側電源回路と、入力側電源回路からの直流電圧が入力され、前記発光素子と接続する出力端子を有し、前記出力端子を介して前記発光素子に直流電流を供給する出力側電源回路と、前記出力端子の負荷電圧を検出する負荷電圧検出回路と、入力信号を受け、前記負荷電圧を前記入力信号に応じて異なる大きさの電圧に変換し、保護電圧として出力する検出電圧可変回路と、前記直流電圧の最大値が大きいほど前記負荷電圧を小さな値に変換させるように前記入力信号を前記検出電圧可変回路に与え、前記保護電圧の大きさに基づいて保護動作を行う制御回路と、を備える。   The lighting fixture concerning this invention is equipped with a light emitting element and the lighting device which lights the said light emitting element. The lighting device has an input-side power supply circuit that outputs a DC voltage when connected to a power source, and has an output terminal that receives a DC voltage from the input-side power supply circuit and is connected to the light-emitting element, through the output terminal. An output side power supply circuit that supplies a direct current to the light emitting element, a load voltage detection circuit that detects a load voltage of the output terminal, an input signal, and the load voltage having a different magnitude according to the input signal A detection voltage variable circuit that converts the voltage into voltage and outputs it as a protection voltage; and applies the input signal to the detection voltage variable circuit so that the load voltage is converted to a smaller value as the maximum value of the DC voltage increases, and the protection And a control circuit that performs a protection operation based on the magnitude of the voltage.

本発明によれば、負荷電圧から保護電圧を生成する検出電圧可変回路が可変な出力特性を有するので、発光素子の負荷電圧が広範囲に及んでも保護動作を適切に実行することができる。   According to the present invention, since the detection voltage variable circuit that generates the protection voltage from the load voltage has variable output characteristics, the protection operation can be appropriately executed even when the load voltage of the light emitting element reaches a wide range.

本発明の実施の形態にかかる照明器具および点灯装置を示す図である。It is a figure which shows the lighting fixture and lighting device concerning embodiment of this invention. 本発明の実施の形態にかかる照明器具および点灯装置を示す図である。It is a figure which shows the lighting fixture and lighting device concerning embodiment of this invention. 本発明の実施の形態にかかる検出電圧可変回路を示す図である。It is a figure which shows the detection voltage variable circuit concerning embodiment of this invention. 本発明の実施の形態にかかる点灯装置の動作を示す図である。It is a figure which shows operation | movement of the lighting device concerning embodiment of this invention. 本発明の実施の形態にかかる点灯装置の動作を示す図である。It is a figure which shows operation | movement of the lighting device concerning embodiment of this invention. 本発明の実施の形態にかかる点灯装置の動作を示す図である。It is a figure which shows operation | movement of the lighting device concerning embodiment of this invention. 本発明の実施の形態にかかる点灯装置の動作を示す図である。It is a figure which shows operation | movement of the lighting device concerning embodiment of this invention.

図１および図２は、本発明の実施の形態にかかる照明器具３００を示す図である。照明器具３００は、商用電源Ｖａｃと接続する点灯装置１００と、点灯装置１００に接続するＬＥＤモジュール１２０とを備えている。ＬＥＤモジュール１２０にはＬＥＤ素子の個数が互いに異なるＬＥＤモジュール１２０ａ、１２０ｂが含まれており、これらのいずれか一方を任意に選択して使用できる。図１および図２には点灯装置１００の回路図が示されている。点灯装置１００は、入力端子１０２が交流電源（典型的には商用電源）Ｖａｃに接続し、出力端子１０４を介してＬＥＤモジュール１２０ａ、１２０ｂのいずれかに定電流を流し、ＬＥＤ素子を点灯させる。点灯装置１００は、図１に示すようにＬＥＤ素子の個数が互いに異なる複数のＬＥＤモジュール１２０ａ、１２０ｂの両方に対応しており、どちらが接続されても点灯が可能である。図２に示すように、点灯装置１００は、入力端子１０２と、ノイズ抑制回路１と、整流回路２と、入力側の電源回路である昇圧チョッパ回路３と、昇圧チョッパ回路３と接続してこれよりも出力側に設けられた電源回路である降圧チョッパ回路４と、負荷電圧検出回路５と、制御回路６と、検出電圧可変回路８と、出力端子１０４とを備えている。図２は、ＬＥＤモジュール１２０ａが点灯装置１００に接続されているときの回路図である。ＬＥＤ素子数がＬＥＤモジュール１２０ａより多いＬＥＤモジュール１２０ｂも点灯装置１００に接続可能である。制御回路６には調光器２００が接続されている。   1 and 2 are diagrams showing a lighting apparatus 300 according to an embodiment of the present invention. The lighting fixture 300 includes a lighting device 100 connected to the commercial power source Vac and an LED module 120 connected to the lighting device 100. The LED module 120 includes LED modules 120a and 120b having different numbers of LED elements, and any one of them can be arbitrarily selected and used. A circuit diagram of the lighting device 100 is shown in FIGS. In the lighting device 100, the input terminal 102 is connected to an AC power supply (typically commercial power supply) Vac, and a constant current is supplied to one of the LED modules 120 a and 120 b via the output terminal 104 to light the LED element. The lighting device 100 corresponds to both of the plurality of LED modules 120a and 120b having different numbers of LED elements as shown in FIG. 1, and can be lit regardless of which one is connected. As shown in FIG. 2, the lighting device 100 is connected to an input terminal 102, a noise suppression circuit 1, a rectifier circuit 2, a boost chopper circuit 3 that is a power circuit on the input side, and a boost chopper circuit 3. Further, a step-down chopper circuit 4, which is a power supply circuit provided on the output side, a load voltage detection circuit 5, a control circuit 6, a detection voltage variable circuit 8, and an output terminal 104 are provided. FIG. 2 is a circuit diagram when the LED module 120 a is connected to the lighting device 100. An LED module 120b having more LED elements than the LED module 120a can also be connected to the lighting device 100. A dimmer 200 is connected to the control circuit 6.

［ノイズ抑制回路１、整流回路２］
ノイズ抑制回路１は、例えばＬ型あるいはΠ型のノイズフィルタなどからなる。整流回路２は、全波整流を行うダイオードブリッジである。 [Noise suppression circuit 1, rectifier circuit 2]
The noise suppression circuit 1 is composed of, for example, an L-shaped or saddle-shaped noise filter. The rectifier circuit 2 is a diode bridge that performs full-wave rectification.

［昇圧チョッパ回路３］
昇圧チョッパ回路３は、一端が整流回路２の高電位側に接続されるインダクタＬ２と、このインダクタＬ２の他端に接続されるＭＯＳＦＥＴであるスイッチング素子Ｑ１と、アノード端子がスイッチング素子Ｑ１とインダクタＬ２との接続点に接続されるダイオードＤ１と、このダイオードＤ１のカソード端子に正極が接続され整流回路２の低電位側に負極が接続される平滑コンデンサＣ３と、この平滑コンデンサＣ３に並列に接続される抵抗Ｒ１、Ｒ２の直列回路とを備えている。スイッチング素子Ｑ１は、制御回路６により交流電源Ｖａｃの電源周波数よりも十分に高い周波数（例えば数百ｋＨｚ）でオンオフされる。昇圧チョッパ回路３では、スイッチング素子Ｑ１をオンオフさせると、スイッチング素子Ｑ１のオン期間にインダクタＬ２に蓄積されたエネルギーが、スイッチング素子Ｑ１のオフ期間にダイオードＤ１を介して放出される。そして、整流回路２からの出力にインダクタＬ２から放出されるエネルギーが重畳される形で平滑コンデンサＣ３が充電されるため、平滑コンデンサＣ３の両端電圧を整流回路２の出力電圧よりも昇圧することができる。平滑コンデンサＣ３の両端電圧は抵抗Ｒ１、Ｒ２を用いて分圧され、抵抗Ｒ２の両端電圧が制御回路６に入力される。制御回路６は、入力された抵抗Ｒ２の両端電圧に基づいて、平滑コンデンサＣ３の両端電圧の平均値が一定化されるようにスイッチング素子Ｑ１をオンオフする。 [Boost chopper circuit 3]
The step-up chopper circuit 3 has an inductor L2 whose one end is connected to the high potential side of the rectifier circuit 2, a switching element Q1 which is a MOSFET connected to the other end of the inductor L2, and an anode terminal which is the switching element Q1 and the inductor L2. Is connected in parallel to the smoothing capacitor C3, a diode D1 connected to the connection point of the diode D1, a smoothing capacitor C3 having a positive electrode connected to the cathode terminal of the diode D1 and a negative electrode connected to the low potential side of the rectifier circuit 2. And resistors R1 and R2 in series. The switching element Q1 is turned on / off by the control circuit 6 at a frequency (for example, several hundred kHz) sufficiently higher than the power supply frequency of the AC power supply Vac. In the step-up chopper circuit 3, when the switching element Q1 is turned on / off, the energy accumulated in the inductor L2 during the on period of the switching element Q1 is released through the diode D1 during the off period of the switching element Q1. Since the smoothing capacitor C3 is charged in such a manner that the energy released from the inductor L2 is superimposed on the output from the rectifier circuit 2, the voltage across the smoothing capacitor C3 can be boosted above the output voltage of the rectifier circuit 2. it can. The voltage across the smoothing capacitor C3 is divided using resistors R1 and R2, and the voltage across the resistor R2 is input to the control circuit 6. The control circuit 6 turns on and off the switching element Q1 based on the input voltage across the resistor R2 so that the average value of the voltage across the smoothing capacitor C3 is constant.

［降圧チョッパ回路４］
降圧チョッパ回路４はＭＯＳＦＥＴからなるスイッチング素子Ｑ２とダイオードＤ２の直列回路を備えており、この直列回路が昇圧チョッパ回路３の平滑コンデンサＣ３と並列に接続されている。降圧チョッパ回路４は、チョークコイルＬ３、平滑コンデンサＣ４、および抵抗Ｒ３の直列回路を備えており、この直列回路がダイオードＤ２に並列に接続されている。抵抗Ｒ３は、ＬＥＤモジュール１２０ａに流れるＬＥＤ電流を検出するためのものである。降圧チョッパ回路４は、いわゆる非絶縁型の降圧コンバータである。この降圧チョッパ回路４は、入力される平滑コンデンサＣ３の平滑電圧を低い直流電圧に変換する。降圧チョッパ回路４は、スイッチング素子Ｑ２のオン期間に入力から出力へ電流が流れるとともに、チョークコイルＬ３にエネルギーが蓄えられる。スイッチング素子Ｑ２のオフ期間に、チョークコイルＬ３に蓄えられたエネルギーにて、ダイオードＤ２を介して、ＬＥＤモジュール１２０ａのＬＥＤ素子に電流を流す。さらに、平滑コンデンサＣ４にて高周波リップルを抑制している。このとき、ＬＥＤモジュール１２０ａの電流を検出する抵抗Ｒ３からの検出電圧が制御回路６に入力され、制御回路６はこの検出電圧に基づいて、ＬＥＤ素子に流れる電流が一定電流になるように降圧チョッパ回路４のスイッチング素子Ｑ２をオンオフする。また、この抵抗Ｒ３からの検出電圧に基づいて、ＬＥＤモジュール１２０ａが接続されているか否かを判断する。この点については他の方法でも良く例えば特開２０１２−１６０３２２号公報に記載の方法などでも構わない。 [Step-down chopper circuit 4]
The step-down chopper circuit 4 includes a series circuit of a switching element Q2 made of a MOSFET and a diode D2, and this series circuit is connected in parallel with the smoothing capacitor C3 of the step-up chopper circuit 3. The step-down chopper circuit 4 includes a series circuit of a choke coil L3, a smoothing capacitor C4, and a resistor R3, and this series circuit is connected in parallel to the diode D2. The resistor R3 is for detecting the LED current flowing through the LED module 120a. The step-down chopper circuit 4 is a so-called non-insulated step-down converter. The step-down chopper circuit 4 converts the input smoothing voltage of the smoothing capacitor C3 into a low DC voltage. In the step-down chopper circuit 4, current flows from the input to the output while the switching element Q2 is on, and energy is stored in the choke coil L3. During the OFF period of the switching element Q2, a current is passed through the LED element of the LED module 120a via the diode D2 with the energy stored in the choke coil L3. Furthermore, the high frequency ripple is suppressed by the smoothing capacitor C4. At this time, the detection voltage from the resistor R3 for detecting the current of the LED module 120a is input to the control circuit 6, and the control circuit 6 uses the step-down chopper so that the current flowing through the LED element becomes a constant current based on this detection voltage. The switching element Q2 of the circuit 4 is turned on / off. Further, based on the detected voltage from the resistor R3, it is determined whether or not the LED module 120a is connected. For this point, other methods may be used, for example, a method described in JP 2012-160322 A.

［負荷電圧検出回路５］
負荷電圧検出回路５は、降圧チョッパ回路４の出力端に接続するＬＥＤモジュール１２０ａの負荷電圧ＶＦを分圧して、制御回路６に入力する。すなわち、負荷電圧検出回路５は、負荷電圧ＶＦに比例的に対応する保護電圧Ｖｓを制御回路６に入力する。負荷電圧検出回路５は、抵抗Ｒ４、Ｒ５、Ｒ６からなる直列回路が、降圧チョッパ回路４のチョークコイルＬ３と平滑コンデンサＣ４の接点と、グランドの間に並列に接続されている。また、抵抗Ｒ６と並列に、検出電圧可変回路８が接続されている。 [Load voltage detection circuit 5]
The load voltage detection circuit 5 divides the load voltage VF of the LED module 120 a connected to the output terminal of the step-down chopper circuit 4 and inputs it to the control circuit 6. That is, the load voltage detection circuit 5 inputs the protection voltage Vs proportionally corresponding to the load voltage VF to the control circuit 6. In the load voltage detection circuit 5, a series circuit composed of resistors R4, R5, and R6 is connected in parallel between the contact of the choke coil L3 and the smoothing capacitor C4 of the step-down chopper circuit 4 and the ground. A variable detection voltage circuit 8 is connected in parallel with the resistor R6.

［検出電圧可変回路８］
図３は、検出電圧可変回路８の回路図である。検出電圧可変回路８は、抵抗Ｒ７、Ｒ８の直列回路が、負荷電圧検出回路５の抵抗Ｒ６と並列に接続されている。抵抗Ｒ８に並列に接続しているコンデンサＣ５は、ノイズ除去用である。制御回路６の端子Ｃからの入力は、抵抗Ｒ１０、Ｒ１１にて分圧され、トランジスタＱ３のベースに入力される。抵抗Ｒ１１に並列に接続しているコンデンサＣ６は、ノイズ除去用である。 [Detection voltage variable circuit 8]
FIG. 3 is a circuit diagram of the detection voltage variable circuit 8. In the detection voltage variable circuit 8, a series circuit of resistors R 7 and R 8 is connected in parallel with the resistor R 6 of the load voltage detection circuit 5. A capacitor C5 connected in parallel with the resistor R8 is for noise removal. The input from the terminal C of the control circuit 6 is divided by resistors R10 and R11 and input to the base of the transistor Q3. A capacitor C6 connected in parallel to the resistor R11 is for noise removal.

検出電圧可変回路８は、制御回路６の端子Ｃから入力信号を受け、この入力信号に応じて負荷電圧ＶＦを異なる大きさの電圧に変換し、保護電圧Ｖｓとして出力する。すなわち、制御回路６の端子Ｃから入力信号でトランジスタＱ３がオンすると、抵抗Ｒ７、Ｒ８、Ｒ９の分圧電圧が、制御回路６の端子Ｄに入力される。一方、トランジスタＱ３がオフすると、抵抗Ｒ７、Ｒ８の分圧電圧が制御回路６の端子Ｄに入力される。このようにすることで、検出電圧可変回路８は、端子Ｃから受ける入力信号に応じてトランジスタＱ３のオン、オフを制御することによって、負荷電圧ＶＦに対する保護電圧Ｖｓの出力特性を切り替えることができる。   The detection voltage variable circuit 8 receives an input signal from the terminal C of the control circuit 6, converts the load voltage VF into a voltage having a different magnitude in accordance with the input signal, and outputs it as a protection voltage Vs. That is, when the transistor Q3 is turned on by an input signal from the terminal C of the control circuit 6, the divided voltages of the resistors R7, R8, and R9 are input to the terminal D of the control circuit 6. On the other hand, when the transistor Q3 is turned off, the divided voltage of the resistors R7 and R8 is input to the terminal D of the control circuit 6. By doing so, the detection voltage variable circuit 8 can switch the output characteristics of the protection voltage Vs with respect to the load voltage VF by controlling on / off of the transistor Q3 in accordance with the input signal received from the terminal C. .

［制御回路６］
制御回路６は、点灯装置１００に交流電源Ｖａｃが入力されると、昇圧チョッパ回路３を駆動させるとともに、降圧チョッパ回路４を起動させる。制御回路６は、ＬＥＤ電流ＩＦを検出する抵抗Ｒ３からの検出電圧より、ＬＥＤモジュール１２０ａまたはＬＥＤモジュール１２０ｂの接続有無を確認する。その後、ＬＥＤモジュール接続有りの場合、制御回路６は、降圧チョッパ回路４を駆動させる。一方、モジュールの接続無しの場合、制御回路６は、昇圧チョッパ回路３と降圧チョッパ回路４のそれぞれのスイッチング素子Ｑ１、Ｑ２を停止する。 [Control circuit 6]
When the AC power supply Vac is input to the lighting device 100, the control circuit 6 drives the step-up chopper circuit 3 and activates the step-down chopper circuit 4. The control circuit 6 confirms whether the LED module 120a or the LED module 120b is connected based on the detection voltage from the resistor R3 that detects the LED current IF. Thereafter, when the LED module is connected, the control circuit 6 drives the step-down chopper circuit 4. On the other hand, when no module is connected, the control circuit 6 stops the switching elements Q1 and Q2 of the step-up chopper circuit 3 and the step-down chopper circuit 4, respectively.

制御回路６は、検出電圧可変回路８の出力する保護電圧Ｖｓをその端子Ｄで受けて、保護電圧Ｖｓの大きさに基づいて保護動作を行う。制御回路６は、昇圧チョッパ回路３の出力電圧の最大値が大きいほど負荷電圧ＶＦを小さな値に変換させるように、入力信号を検出電圧可変回路８のトランジスタＱ３のベースにバイアスする。制御回路６は、異なる負荷電圧ＶＦを有するＬＥＤモジュール１２０ａ、１２０ｂのいずれが点灯されている場合においても保護電圧Ｖｓが概略同等の値、好ましくは等しい値になるように、トランジスタＱ３のオンオフを制御する。   The control circuit 6 receives the protection voltage Vs output from the detection voltage variable circuit 8 at its terminal D, and performs a protection operation based on the magnitude of the protection voltage Vs. The control circuit 6 biases the input signal to the base of the transistor Q3 of the detection voltage variable circuit 8 so that the load voltage VF is converted to a smaller value as the maximum value of the output voltage of the boost chopper circuit 3 is larger. The control circuit 6 controls the on / off of the transistor Q3 so that the protection voltage Vs is approximately the same value, preferably the same value when any of the LED modules 120a and 120b having different load voltages VF is lit. To do.

図４〜図７は、それぞれ異なる動作条件での点灯装置１００の特性を説明するための図である。図４（ａ）〜図７（ａ）はそれぞれ昇圧チョッパ回路３の出力電圧Ｖｂｕｓの波形を示しており、破線Ｖｂｕｓ（ａｖ）は出力電圧Ｖｂｕｓの平均値である。図４（ｂ）〜図７（ｂ）はそれぞれ調光電圧Ｖｄｉｍを示し、図４（ｃ）〜図７（ｃ）はそれぞれ保護電圧Ｖｓを示している。図４および図７は、ＬＥＤ電圧すなわち負荷電圧がＶＦであるＬＥＤモジュール１２０ａを点灯装置１００に接続したときの特性である。図５および図６は、負荷電圧がその４倍（すなわちＶＦ×４）であるＬＥＤモジュール１２０ｂを点灯装置１００に接続したときの特性である。図４および図５におけるＬＥＤ電流をＩＦとすると、図６および図７におけるＬＥＤ電流はその半分である。図４の場合の昇圧チョッパ回路３の出力電流をＩＯとすると、図５の場合には昇圧チョッパ回路３がその４倍の出力電流（ＩＯ×４）を出力し、図６の場合には昇圧チョッパ回路３がその２倍の出力電流（ＩＯ×２）を出力し、図７の場合には昇圧チョッパ回路３がその１／２倍の出力電流（ＩＯ×１／２）を出力する。ＩＯ＝（ＶＦ×ＩＦ）／Ｖｂｕｓで求められる。   4-7 is a figure for demonstrating the characteristic of the lighting device 100 on each different operating conditions. FIGS. 4A to 7A each show the waveform of the output voltage Vbus of the boost chopper circuit 3, and the broken line Vbus (av) is an average value of the output voltage Vbus. 4B to 7B show the dimming voltage Vdim, and FIGS. 4C to 7C show the protection voltage Vs. 4 and 7 show characteristics when the LED module 120a whose LED voltage, that is, the load voltage is VF, is connected to the lighting device 100. FIG. FIG. 5 and FIG. 6 show the characteristics when the LED module 120b whose load voltage is four times (that is, VF × 4) is connected to the lighting device 100. FIG. If the LED current in FIGS. 4 and 5 is IF, the LED current in FIGS. 6 and 7 is half that. If the output current of the boost chopper circuit 3 in FIG. 4 is IO, the boost chopper circuit 3 outputs four times the output current (IO × 4) in the case of FIG. 5, and the boost current in the case of FIG. The chopper circuit 3 outputs twice the output current (IO × 2), and in the case of FIG. 7, the step-up chopper circuit 3 outputs half the output current (IO × 1/2). IO = (VF × IF) / Vbus.

降圧チョッパ回路４を駆動させた後、昇圧チョッパ回路３の出力電圧を所定時間検出して得た値が基準値とされる。なお、この所定期間は、図４（ａ）〜図７（ａ）に示すように本実施の形態では出力電圧波形の４周期分の長さとしているが、本発明はこれに限られず、３周期分以下でもよいし、５周期分以上でもよい。図４（ａ）〜図７（ａ）に示すように昇圧チョッパ回路３の出力電圧の最大値を、閾値Ｖｂｔｈ１、Ｖｂｔｈ２と比較する。図４（ａ）に示すように所定期間内で出力電圧の最大値が閾値Ｖｂｔｈ２を数回超えた場合、制御回路６は端子Ｃにハイ電圧を出力する。一方、図７（ａ）に示すように閾値Ｖｂｔｈ１を下回っている場合は、制御回路６は端子Ｃにロー電圧を出力する。   A value obtained by detecting the output voltage of the step-up chopper circuit 3 for a predetermined time after driving the step-down chopper circuit 4 is set as a reference value. The predetermined period is set to a length corresponding to four cycles of the output voltage waveform in this embodiment as shown in FIGS. 4A to 7A. However, the present invention is not limited to this. The period may be less than or equal to 5 periods or more. As shown in FIGS. 4A to 7A, the maximum value of the output voltage of the boost chopper circuit 3 is compared with threshold values Vbth1 and Vbth2. As shown in FIG. 4A, when the maximum value of the output voltage exceeds the threshold value Vbth2 several times within a predetermined period, the control circuit 6 outputs a high voltage to the terminal C. On the other hand, as shown in FIG. 7A, when it is below the threshold value Vbth1, the control circuit 6 outputs a low voltage to the terminal C.

図６（ａ）に示すように所定期間内で出力電圧の最大値が閾値Ｖｂｔｈ１を数回超えかつ閾値Ｖｂｔｈ２以下の場合、制御回路６は、ＬＥＤ電流ＩＦを検出する抵抗Ｒ３からの検出電圧と、閾値を比較する。すなわち、図６（ｂ）に示すように降圧チョッパ回路４の負荷電流に対応する調光電圧Ｖｄｉｍと、調光閾値電圧Ｖｄｔｈを比較する。図６（ｃ）に示すように調光電圧Ｖｄｉｍが調光閾値電圧Ｖｄｔｈを下回っている場合は、制御回路６は端子Ｃにロー電圧を出力する。一方、調光電圧Ｖｄｉｍが調光閾値電圧Ｖｄｔｈ以上の場合、制御回路６は端子Ｃにハイ電圧を出力する。   As shown in FIG. 6A, when the maximum value of the output voltage exceeds the threshold value Vbth1 several times and is equal to or less than the threshold value Vbth2 within a predetermined period, the control circuit 6 detects the detection voltage from the resistor R3 that detects the LED current IF. Compare thresholds. That is, as shown in FIG. 6B, the dimming voltage Vdim corresponding to the load current of the step-down chopper circuit 4 is compared with the dimming threshold voltage Vdth. As shown in FIG. 6C, when the dimming voltage Vdim is lower than the dimming threshold voltage Vdth, the control circuit 6 outputs a low voltage to the terminal C. On the other hand, when the dimming voltage Vdim is equal to or higher than the dimming threshold voltage Vdth, the control circuit 6 outputs a high voltage to the terminal C.

昇圧チョッパ回路３の出力電圧の最大値と、降圧チョッパ回路４の負荷電流に対応する調光電圧Ｖｄｉｍと調光閾値電圧Ｖｄｔｈを比較することで、降圧チョッパ回路４の負荷電圧を試算する。その結果を基に、異なる負荷電圧ＶＦを有するＬＥＤモジュール１２０ａ、１２０ｂのいずれが点灯されている場合も、制御回路６に入力される保護電圧Ｖｓ（すなわち端子Ｄの電圧）が概略同じ電圧となるように、検出電圧可変回路８のトランジスタＱ３をオン／オフさせる。また、概略同じ電圧が入力されるように、抵抗Ｒ４〜Ｒ９の定数は選定される。   The load voltage of the step-down chopper circuit 4 is calculated by comparing the maximum value of the output voltage of the step-up chopper circuit 3 with the dimming voltage Vdim corresponding to the load current of the step-down chopper circuit 4 and the dimming threshold voltage Vdth. Based on the result, the protection voltage Vs (that is, the voltage at the terminal D) input to the control circuit 6 is substantially the same voltage when any of the LED modules 120a and 120b having different load voltages VF is lit. Thus, the transistor Q3 of the detection voltage variable circuit 8 is turned on / off. The constants of the resistors R4 to R9 are selected so that substantially the same voltage is input.

保護電圧Ｖｓが保護閾値電圧Ｖｓｔｈを逸脱したときには、制御回路６は降圧チョッパ回路４を制御して安全動作をおこなう。安全動作の内容は既に公知の各種の制御動作を適宜に採用すればよいので、説明は省略する。   When the protection voltage Vs deviates from the protection threshold voltage Vsth, the control circuit 6 controls the step-down chopper circuit 4 to perform a safe operation. Since the contents of the safe operation may adopt various known control operations as appropriate, the description is omitted.

なお、本実施の形態では昇圧チョッパ回路３の出力電圧の最大値に対する閾値を２つ設け（すなわちＶｂｔｈ１、Ｖｂｔｈ２）、降圧チョッパ回路４の負荷電流に対応する調光電圧の調光閾値電圧Ｖｄｔｈを１つ設けたが、本発明はこれに限られない。互いに負荷電圧が異なるさらに多くの個数のＬＥＤモジュールに対応するため、検出電圧可変回路８、昇圧チョッパ回路３の出力電圧の最大値に対する閾値Ｖｂｔｈの数と、降圧チョッパ回路４の負荷電流に対応する調光電圧Ｖｄｉｍの調光閾値電圧Ｖｄｔｈの数を増やしてもよい。また、ＬＥＤ電流すなわちＩＦが固定出力の点灯装置の場合、昇圧チョッパ回路３の出力電圧の最大値と閾値を比較することで、降圧チョッパ回路４の負荷電圧を試算できることはいうまでもない。   In the present embodiment, two thresholds for the maximum value of the output voltage of the step-up chopper circuit 3 are provided (that is, Vbth1, Vbth2), and the dimming threshold voltage Vdth of the dimming voltage corresponding to the load current of the step-down chopper circuit 4 is set. Although one is provided, the present invention is not limited to this. In order to cope with a larger number of LED modules having different load voltages, the number of threshold values Vbth corresponding to the maximum value of the output voltage of the detection voltage variable circuit 8 and the step-up chopper circuit 3 and the load current of the step-down chopper circuit 4 are supported. The number of dimming threshold voltages Vdth of the dimming voltage Vdim may be increased. In the case of a lighting device with a fixed output of LED current, that is, IF, it goes without saying that the load voltage of the step-down chopper circuit 4 can be estimated by comparing the maximum value of the output voltage of the step-up chopper circuit 3 with a threshold value.

このように、異なる負荷電圧のＬＥＤモジュールを使用しても、昇圧チョッパ回路３の出力電圧の最大値と、降圧チョッパ回路４の負荷電流に対応する調光電圧と閾値を比較することで、降圧チョッパ回路４の負荷電圧を試算する。その結果を基に、異なる負荷電圧のＬＥＤモジュール１２０ａ、１２０ｂのいずれを点灯させる場合でも概略同じ電圧が入力されるように、検出電圧可変回路８のトランジスタＱ３をオン／オフさせる。また、概略同じ電圧が入力されるように、抵抗Ｒ４〜Ｒ９の定数を選定しておく。また、例えば、ＬＥＤモジュールを点灯しているときにＬＥＤモジュールが接続手段から外された場合、降圧チョッパ回路４が一定電流を流そうとする結果、降圧チョッパ回路４の出力電圧が上昇する。降圧チョッパ回路４の出力電圧は最大で昇圧チョッパ回路３の出力電圧まで上がるが、制御回路６はその前に降圧チョッパ回路４および昇圧チョッパ回路３の発振を停止する。このようにすることで、ＬＥＤ電圧に対して出力電圧が過度に大きな値となるのを防止でき、ＬＥＤモジュールが接続手段に再接続されたときに過大なサージ電流がＬＥＤ素子に流れることを防止できる。   As described above, even when LED modules having different load voltages are used, the maximum value of the output voltage of the step-up chopper circuit 3 and the dimming voltage corresponding to the load current of the step-down chopper circuit 4 are compared with the threshold value. The load voltage of the chopper circuit 4 is estimated. Based on the result, the transistor Q3 of the detection voltage variable circuit 8 is turned on / off so that substantially the same voltage is input when any of the LED modules 120a, 120b having different load voltages is turned on. Further, the constants of the resistors R4 to R9 are selected so that substantially the same voltage is input. Further, for example, when the LED module is removed from the connection means while the LED module is lit, the step-down chopper circuit 4 tries to pass a constant current, and as a result, the output voltage of the step-down chopper circuit 4 increases. The output voltage of the step-down chopper circuit 4 rises up to the output voltage of the step-up chopper circuit 3, but the control circuit 6 stops the oscillation of the step-down chopper circuit 4 and the step-up chopper circuit 3 before that. In this way, the output voltage can be prevented from becoming excessively large with respect to the LED voltage, and an excessive surge current can be prevented from flowing to the LED element when the LED module is reconnected to the connection means. it can.

また、負荷電圧に対応する保護電圧の出力特性を可変させているので保護閾値電圧Ｖｓｔｈを可変しなくともよく、制御回路６の電源電圧の制約を受けずに負荷電圧が広範囲である場合にも適切に保護動作を実行できる。
なお、上述したように、制御回路６は、昇圧チョッパ回路３の出力電圧の最大値が大きいほど負荷電圧ＶＦを小さな値に変換させるように、入力信号を検出電圧可変回路８のトランジスタＱ３のベースにバイアスしている。このバイアス制御には、「出力電圧の最小値が小さいほど」負荷電圧ＶＦを小さな値に変換させるようにトランジスタＱ３のベースへのバイアスを制御することを含んでもよく、「出力電圧の最大値あるいは最小値と出力電圧の平均値との間の差が大きいほど」負荷電圧ＶＦを小さな値に変換させるようにトランジスタＱ３のベースへのバイアスを制御することを含んでもよい。 Further, since the output characteristic of the protection voltage corresponding to the load voltage is varied, the protection threshold voltage Vsth does not need to be varied, and the load voltage is in a wide range without being restricted by the power supply voltage of the control circuit 6. Proper protection can be performed.
As described above, the control circuit 6 converts the input signal to the base of the transistor Q3 of the detection voltage variable circuit 8 so that the load voltage VF is converted to a smaller value as the maximum value of the output voltage of the boost chopper circuit 3 is larger. Biased to. This bias control may include controlling the bias to the base of the transistor Q3 so as to convert the load voltage VF to a smaller value “as the minimum value of the output voltage is smaller”. Controlling the bias to the base of transistor Q3 so that the greater the difference between the minimum value and the average value of the output voltage is, the more the load voltage VF is converted to a smaller value.

１ ノイズ抑制回路、２ 整流回路、３ 昇圧チョッパ回路、４ 降圧チョッパ回路、５ 負荷電圧検出回路、６ 制御回路、８ 検出電圧可変回路、１００ 点灯装置、１０２ 入力端子、１０４ 出力端子、１２０，１２０ａ，１２０ｂ ＬＥＤモジュール、２００ 調光器、３００ 照明器具、Ａ，Ｂ，Ｃ，Ｄ 端子 DESCRIPTION OF SYMBOLS 1 Noise suppression circuit, 2 rectifier circuit, 3 step-up chopper circuit, 4 step-down chopper circuit, 5 load voltage detection circuit, 6 control circuit, 8 detection voltage variable circuit, 100 lighting device, 102 input terminal, 104 output terminal, 120, 120a , 120b LED module, 200 dimmer, 300 lighting fixture, A, B, C, D terminals

Claims (4)

電源と接続して直流電圧を出力する入力側電源回路と、
入力側電源回路からの直流電圧が入力され、発光素子と接続する出力端子を有し、前記出力端子を介して前記発光素子に直流電流を供給する出力側電源回路と、
前記出力端子の負荷電圧を検出する負荷電圧検出回路と、
入力信号を受け、前記負荷電圧を前記入力信号に応じて異なる大きさの電圧に変換し、保護電圧として出力する検出電圧可変回路と、
前記直流電圧の最大値が大きいほど前記負荷電圧を小さな値に変換させるように前記入力信号を前記検出電圧可変回路に与え、前記保護電圧の大きさに基づいて保護動作を行う制御回路と、
を備える点灯装置。 An input side power supply circuit that outputs a DC voltage by connecting to a power supply,
An output side power supply circuit that receives a DC voltage from the input side power supply circuit, has an output terminal connected to the light emitting element, and supplies a direct current to the light emitting element through the output terminal;
A load voltage detection circuit for detecting a load voltage of the output terminal;
A detection voltage variable circuit that receives an input signal, converts the load voltage into a voltage having a different magnitude according to the input signal, and outputs the voltage as a protection voltage;
A control circuit that applies the input signal to the detection voltage variable circuit so as to convert the load voltage to a smaller value as the maximum value of the DC voltage is larger, and performs a protection operation based on the magnitude of the protection voltage;
A lighting device comprising: 前記出力側電源回路は、調光器の調光電圧に応じて前記直流電流を調整し、
前記制御回路は、前記調光器の調光電圧が高いほど前記負荷電圧を低い値に変換させるように前記入力信号を前記検出電圧可変回路に与える請求項１に記載の点灯装置。 The output side power supply circuit adjusts the direct current according to the dimming voltage of the dimmer,
The lighting device according to claim 1, wherein the control circuit gives the input signal to the detection voltage variable circuit so that the load voltage is converted to a lower value as the dimming voltage of the dimmer is higher. 前記検出電圧可変回路は、
前記入力信号に従って制御されるトランジスタと、
前記負荷電圧を分圧する分圧抵抗値が前記トランジスタのオンオフにより可変される分圧回路と、
を含む請求項１または２に記載の点灯装置。 The detection voltage variable circuit includes:
A transistor controlled according to the input signal;
A voltage dividing circuit in which a voltage dividing resistance value for dividing the load voltage is varied by turning on and off the transistor;
The lighting device according to claim 1, comprising: 発光素子と、
前記発光素子を点灯させる点灯装置と、
を備え、
前記点灯装置は、
電源と接続して直流電圧を出力する入力側電源回路と、
入力側電源回路からの直流電圧が入力され、前記発光素子と接続する出力端子を有し、前記出力端子を介して前記発光素子に直流電流を供給する出力側電源回路と、
前記出力端子の負荷電圧を検出する負荷電圧検出回路と、
入力信号を受け、前記負荷電圧を前記入力信号に応じて異なる大きさの電圧に変換し、保護電圧として出力する検出電圧可変回路と、
前記直流電圧の最大値が大きいほど前記負荷電圧を小さな値に変換させるように前記入力信号を前記検出電圧可変回路に与え、前記保護電圧の大きさに基づいて保護動作を行う制御回路と、
を備える照明器具。 A light emitting element;
A lighting device for lighting the light emitting element;
With
The lighting device is
An input side power supply circuit that outputs a DC voltage by connecting to a power supply,
An output side power supply circuit that receives a direct current voltage from the input side power supply circuit, has an output terminal connected to the light emitting element, and supplies a direct current to the light emitting element through the output terminal;
A load voltage detection circuit for detecting a load voltage of the output terminal;
A detection voltage variable circuit that receives an input signal, converts the load voltage into a voltage having a different magnitude according to the input signal, and outputs the voltage as a protection voltage;
A control circuit that applies the input signal to the detection voltage variable circuit so as to convert the load voltage to a smaller value as the maximum value of the DC voltage is larger, and performs a protection operation based on the magnitude of the protection voltage;
A lighting fixture comprising:
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