JP2010055824A - Led driving device, lighting system, and luminaire - Google Patents

Led driving device, lighting system, and luminaire Download PDF

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JP2010055824A
JP2010055824A JP2008217373A JP2008217373A JP2010055824A JP 2010055824 A JP2010055824 A JP 2010055824A JP 2008217373 A JP2008217373 A JP 2008217373A JP 2008217373 A JP2008217373 A JP 2008217373A JP 2010055824 A JP2010055824 A JP 2010055824A
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led unit
led
switching element
unit
switching
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JP5237727B2 (en
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Haruo Nagase
春男 永瀬
Takashi Kanbara
隆 神原
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Panasonic Electric Works Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology

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  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a phenomenon that over-current flows in an LED unit when the LED unit is connected again. <P>SOLUTION: A discharge means 7 as a series circuit of a resistor 70 and a switching element 71 is connected in parallel with a smoothing capacitor 43 of a direct current-direct current converting means 4. An ON/OFF switching means 8 turns off the switching element 71 when a no-load determining means 6 determines that the LED unit 2 is connected to a connecting means 3, and switches the switching means 71 from OFF to ON when the non-load determining means 6 determines that the LED unit 2 is disconnected from the connecting means 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、複数個のＬＥＤが直列接続されたＬＥＤユニットを駆動するＬＥＤ駆動装置、これを用いた照明装置及び照明器具に関するものである。   The present invention relates to an LED driving device that drives an LED unit in which a plurality of LEDs are connected in series, and a lighting device and a lighting fixture using the LED driving device.

近年、発光ダイオード（以下「ＬＥＤ」という。）の量産化が盛んに行われており、その用途も多様化している。例えば車両の分野では、ＬＥＤを用いた車内灯や高輝度のヘッドランプ、デイライトランニングランプなどの開発が行われている。   In recent years, light-emitting diodes (hereinafter referred to as “LEDs”) are being mass-produced and their uses are diversified. For example, in the field of vehicles, interior lights using LEDs, high-intensity headlamps, daylight running lamps, and the like have been developed.

ＬＥＤは、白熱電球に比べて、長寿命、応答性が速い、構造上コンパクトに実装でき、また、用途に応じてフィルタなしで各種の色を簡単に生成することができるという利点がある。また、ＬＥＤを光源に採用した照明器具は、薄く立体的に実装できるため、車のデザインなどに制限を与えない自由な設計を可能とする。   Compared with an incandescent light bulb, the LED has an advantage that it has a long life, quick response, can be mounted in a compact structure, and can easily generate various colors without a filter depending on the application. Moreover, since the lighting fixture which employ | adopted LED as a light source can be mounted thinly and three-dimensionally, it enables the free design which does not restrict | limit a vehicle design etc.

従来、ＬＥＤを駆動するＬＥＤ駆動装置としては、複数のＬＥＤを直列接続してなる光源に一定の電流を供給することによって、複数のＬＥＤを均一な明るさで点灯させるものが知られている（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, as an LED driving device for driving an LED, a device that lights a plurality of LEDs with uniform brightness by supplying a constant current to a light source formed by connecting a plurality of LEDs in series is known ( For example, see Patent Document 1).

図１０は、従来の照明装置を示す。従来のＬＥＤ駆動装置９は、昇圧回路９１が直流電源９０からの直流電源電圧を昇圧し平滑コンデンサ９１０で平滑することによって、直流電源電圧より高い出力電圧Ｖｏｕｔを、接続端子９２，９３に接続されたＬＥＤユニット９４に印加する。従来のＬＥＤ駆動装置９では、昇圧回路９１が、ＬＥＤユニット９４に流れる駆動電流Ｉｏｕｔを抵抗器９５によって検出し、上記駆動電流Ｉｏｕｔが定電流になるようにフィードバックして出力電圧Ｖｏｕｔを可変する。上記より、従来のＬＥＤ駆動装置９は、直流電源電圧が変動しても、昇圧回路９１によるフィードバック制御によって、ＬＥＤユニット９４の駆動電流Ｉｏｕｔを定電流にすることができる。
特開２００３−１８７６１４号公報 FIG. 10 shows a conventional lighting device. In the conventional LED drive device 9, the booster circuit 91 boosts the DC power supply voltage from the DC power supply 90 and smoothes it with the smoothing capacitor 910, whereby the output voltage Vout higher than the DC power supply voltage is connected to the connection terminals 92 and 93. Applied to the LED unit 94. In the conventional LED drive device 9, the booster circuit 91 detects the drive current Iout flowing through the LED unit 94 with the resistor 95, and feeds back the drive current Iout to be a constant current to vary the output voltage Vout. As described above, the conventional LED drive device 9 can make the drive current Iout of the LED unit 94 constant by the feedback control by the booster circuit 91 even if the DC power supply voltage fluctuates.
JP 2003-187614 A

ところで、図１１に示すように、ＬＥＤ駆動装置９が駆動開始すると（時間ｔ３１）、出力電圧Ｖｏｕｔは上昇して定格電圧Ｖｓとなり、定常状態になる。定常状態時の駆動電流Ｉｏｕｔは定格電流Ｉｓである。   By the way, as shown in FIG. 11, when the LED driving device 9 starts driving (time t31), the output voltage Vout rises to the rated voltage Vs, and becomes a steady state. The drive current Iout in the steady state is the rated current Is.

その後、時間ｔ３２に、何らかの理由でＬＥＤユニット９４が接続端子９２，９３から外れたとき、昇圧回路９１が駆動電流Ｉｏｕｔを定格電流Ｉｓにしようとすることによって、出力電圧Ｖｏｕｔが上昇する。出力電圧Ｖｏｕｔが上限閾値電圧Ｖｔ１に達したとき（時間ｔ３３）、昇圧回路９１は停止する。期間ｔ３３〜ｔ３４では、平滑コンデンサ９１０は自己放電のみであるため、出力電圧Ｖｏｕｔはほとんど電圧値を下げない。   Thereafter, when the LED unit 94 is disconnected from the connection terminals 92 and 93 for some reason at time t32, the booster circuit 91 tries to set the drive current Iout to the rated current Is, so that the output voltage Vout increases. When the output voltage Vout reaches the upper threshold voltage Vt1 (time t33), the booster circuit 91 stops. In the period t33 to t34, the smoothing capacitor 910 performs only self-discharge, and therefore the output voltage Vout hardly decreases the voltage value.

時間ｔ３４において、ＬＥＤユニット９４が接続端子９２，９３に再接続されると、平滑コンデンサ９１０の電荷がＬＥＤユニット９４を介して放電されるので、従来のＬＥＤ駆動装置９は、時間ｔ３１のようなソフトスタートの制御を行うことができず、ＬＥＤユニット９４へ過電流が流れることになる。従来のＬＥＤ駆動装置９は、平滑コンデンサ９１０の放電を制御することができない。   When the LED unit 94 is reconnected to the connection terminals 92 and 93 at time t34, the electric charge of the smoothing capacitor 910 is discharged through the LED unit 94. Soft start control cannot be performed, and an overcurrent flows to the LED unit 94. The conventional LED driving device 9 cannot control the discharge of the smoothing capacitor 910.

なお、ＬＥＤユニット９４が接続端子９２，９３から外れたときに、昇圧回路９１がすぐに停止し、期間ｔ３２〜ｔ３３のような出力電圧Ｖｏｕｔの上昇が起こらない場合であっても、出力電圧Ｖｏｕｔが定格電圧Ｖｓを維持するため、ＬＥＤユニット９４が接続端子９２，９３に再接続されると、ＬＥＤユニット９４へ過電流が流れる。   Note that when the LED unit 94 is disconnected from the connection terminals 92 and 93, the booster circuit 91 stops immediately, and even if the output voltage Vout does not increase during the period t32 to t33, the output voltage Vout. Maintains the rated voltage Vs, and when the LED unit 94 is reconnected to the connection terminals 92 and 93, an overcurrent flows to the LED unit 94.

本発明は上記の点に鑑みて為されたものであり、その目的は、ＬＥＤユニットが再接続されたときに上記ＬＥＤユニットに過電流が流れることを防止することができるＬＥＤ駆動装置、照明装置及び照明器具を提供することにある。   The present invention has been made in view of the above points, and an object of the present invention is to provide an LED driving device and an illumination device that can prevent an overcurrent from flowing through the LED unit when the LED unit is reconnected. And providing a lighting fixture.

請求項１に係るＬＥＤ駆動装置の発明は、直流電源から電源供給を受けて、複数個のＬＥＤが直列接続されたＬＥＤユニットを駆動するＬＥＤ駆動装置であって、前記ＬＥＤユニットが着脱可能に接続される接続手段と、出力側に平滑コンデンサを有し、前記直流電源から供給される直流電源電力に対して電力変換を行い、出力電圧をＬＥＤユニットに印加する直流−直流変換手段と、前記ＬＥＤユニットが前記接続手段に接続されているか当該ＬＥＤユニットが当該接続手段から外れたかを判別する無負荷判別手段と、抵抗成分とスイッチング素子との直列回路であり、前記平滑コンデンサに並列に接続され、当該平滑コンデンサを放電するための放電経路となる放電手段と、前記スイッチング素子のオンオフを切り替えるオンオフ切替手段とを備え、前記オンオフ切替手段は、前記ＬＥＤユニットが前記接続手段に接続されていると前記無負荷判別手段で判別されたときは前記スイッチング素子をオフ状態にし、前記ＬＥＤユニットが前記接続手段から外れたと前記無負荷判別手段で判別されたときに前記スイッチング素子をオフ状態からオン状態に切り替えることを特徴とする。   The invention of the LED drive device according to claim 1 is an LED drive device that receives power supply from a DC power source and drives an LED unit in which a plurality of LEDs are connected in series, wherein the LED unit is detachably connected. Connecting means, a DC-DC conversion means having a smoothing capacitor on the output side, converting power to DC power supplied from the DC power supply, and applying an output voltage to the LED unit, and the LED A no-load determination means for determining whether a unit is connected to the connection means or whether the LED unit is disconnected from the connection means, a series circuit of a resistance component and a switching element, connected in parallel to the smoothing capacitor, Discharge means serving as a discharge path for discharging the smoothing capacitor, and on / off switching means for switching on / off of the switching element The on / off switching means turns off the switching element when the no-load determination means determines that the LED unit is connected to the connection means, and the LED unit is connected to the connection means. The switching element is switched from an OFF state to an ON state when it is determined by the no-load determination means that it has come off.

請求項２に係るＬＥＤ駆動装置の発明は、請求項１の発明において、前記無負荷判別手段は、前記ＬＥＤユニットの定常時の定格電圧より高い値に閾値電圧を予め設定し、当該閾値電圧より前記出力電圧が小さいときは前記ＬＥＤユニットが前記接続手段に接続されていると判別し、前記出力電圧が上昇して前記閾値電圧に達したときに前記ＬＥＤユニットが前記接続手段から外れたと判別することを特徴とする。   According to a second aspect of the present invention, there is provided the LED drive device according to the first aspect, wherein the no-load determination means presets a threshold voltage to a value higher than a rated voltage of the LED unit at a steady state, When the output voltage is small, it is determined that the LED unit is connected to the connection means, and when the output voltage rises and reaches the threshold voltage, it is determined that the LED unit is disconnected from the connection means. It is characterized by that.

請求項３に係るＬＥＤ駆動装置の発明は、請求項１の発明において、前記無負荷判別手段は、前記直流−直流変換手段から前記ＬＥＤユニットに駆動電流が流れているときは前記ＬＥＤユニットが前記接続手段に接続されていると判別し、前記直流−直流変換手段から前記ＬＥＤユニットに前記駆動電流が流れなくなったときに前記ＬＥＤユニットが前記接続手段から外れたと判別することを特徴とする。   According to a third aspect of the present invention, there is provided the LED drive device according to the first aspect, wherein the no-load determination unit is configured such that when the drive current flows from the DC-DC conversion unit to the LED unit, the LED unit is It is determined that the LED unit is disconnected from the connection unit when it is determined that the LED is connected to the connection unit, and the drive current does not flow from the DC-DC conversion unit to the LED unit.

請求項４に係るＬＥＤ駆動装置の発明は、請求項２の発明において、前記オンオフ切替手段は、前記ＬＥＤユニットの点灯開始時電圧より低い値に下限閾値電圧を予め設定し、前記出力電圧が上昇して前記閾値電圧に達した後に下降して前記下限閾値電圧に達したとき、前記スイッチング素子をオン状態からオフ状態に切り替えることを特徴とする。   According to a fourth aspect of the present invention, in the second aspect of the invention, the on / off switching unit presets a lower threshold voltage to a value lower than the lighting start voltage of the LED unit, and the output voltage increases. The switching element is switched from an on state to an off state when the threshold voltage falls to reach the lower limit threshold voltage after reaching the threshold voltage.

請求項５に係るＬＥＤ駆動装置の発明は、請求項１乃至３の何れか１項の発明において、前記オンオフ切替手段は、前記ＬＥＤユニットが前記接続手段から外れたと前記無負荷判別手段で判別されて前記スイッチング素子をオフ状態からオン状態に切り替えた後、前記平滑コンデンサを放電させるために必要な時間以上に設定された一定時間、当該スイッチング素子のオン状態を継続させることを特徴とする。   According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the on / off switching means is determined by the no-load determination means that the LED unit is disconnected from the connection means. After the switching element is switched from the OFF state to the ON state, the ON state of the switching element is continued for a certain time set longer than the time required for discharging the smoothing capacitor.

請求項６に係るＬＥＤ駆動装置の発明は、請求項１乃至５の何れか１項の発明において、前記直流−直流変換手段は、入力された直流電圧を昇圧する昇圧回路であることを特徴とする。   According to a sixth aspect of the present invention, in the invention of any one of the first to fifth aspects, the DC-DC conversion means is a booster circuit that boosts an input DC voltage. To do.

請求項７に係るＬＥＤ駆動装置の発明は、請求項１乃至５の何れか１項の発明において、前記直流−直流変換手段は、フライバックトランスを用いた昇降圧回路であり、当該昇降圧回路は、入力された直流電圧を昇圧又は降圧することを特徴とする。   According to a seventh aspect of the present invention, there is provided the LED drive device according to any one of the first to fifth aspects, wherein the DC-DC conversion means is a step-up / step-down circuit using a flyback transformer. Is characterized by boosting or stepping down the input DC voltage.

請求項８に係る照明装置の発明は、請求項１乃至７の何れか１項のＬＥＤ駆動装置と、複数個のＬＥＤが直列接続され前記ＬＥＤ駆動装置によって駆動されるＬＥＤユニットとを備えることを特徴とする。   The invention of the lighting device according to claim 8 includes the LED driving device according to any one of claims 1 to 7 and an LED unit in which a plurality of LEDs are connected in series and driven by the LED driving device. Features.

請求項９に係る照明器具の発明は、請求項８の照明装置と、前記照明装置を保持する器具本体とを備えることを特徴とする。   The invention of the lighting fixture according to claim 9 is characterized by comprising the lighting device of claim 8 and a fixture main body for holding the lighting device.

請求項１の発明によれば、ＬＥＤユニットを駆動しているときにＬＥＤユニットが接続手段から外れた場合に、放電手段を用いて平滑コンデンサを放電することによって、直流−直流変換手段の出力電圧を低減することができるので、ＬＥＤユニットが接続手段に再接続されたときに、ＬＥＤユニットに過電流が流れることを防止することができる。   According to the first aspect of the present invention, when the LED unit is detached from the connection means while driving the LED unit, the output voltage of the DC-DC conversion means is discharged by discharging the smoothing capacitor using the discharge means. Therefore, when the LED unit is reconnected to the connection means, it is possible to prevent an overcurrent from flowing through the LED unit.

請求項２の発明によれば、ＬＥＤユニットが接続手段から外れたときに発生する直流−直流変換手段の出力電圧の上昇を利用して、ＬＥＤユニットが接続手段に接続されているか否かを判別することができる。   According to the invention of claim 2, it is determined whether or not the LED unit is connected to the connecting means by utilizing the increase in the output voltage of the DC-DC converting means generated when the LED unit is disconnected from the connecting means. can do.

請求項３の発明によれば、ＬＥＤユニットが接続手段に接続されているか否かを駆動電流で判別することによって、ＬＥＤユニットが接続手段から外れたときに、すぐにその旨を判別することができる。   According to the invention of claim 3, by determining whether or not the LED unit is connected to the connection means by the drive current, it is possible to immediately determine when the LED unit is detached from the connection means. it can.

請求項４の発明によれば、ＬＥＤユニットが接続手段から外れたときにスイッチング素子をオン状態にした後、出力電圧を下限閾値電圧まで下げることによって、出力電圧をＬＥＤユニットの点灯開始時電圧より低くすることができるので、ＬＥＤユニットが接続手段に再接続されたときにＬＥＤユニットに過電流が流れることを確実に防止することができる。   According to the invention of claim 4, the output voltage is lowered from the lighting start voltage of the LED unit by lowering the output voltage to the lower threshold voltage after turning on the switching element when the LED unit is disconnected from the connection means. Since it can be made low, overcurrent can be reliably prevented from flowing through the LED unit when the LED unit is reconnected to the connection means.

請求項５の発明によれば、ＬＥＤユニットが接続手段から外れたときに平滑コンデンサを放電させるために必要な時間以上に設定された一定時間、スイッチング素子のオン状態を継続させることによって、出力電圧を０になるまで低減させることができるので、ＬＥＤユニットが接続手段に再接続されたときにＬＥＤユニットに過電流が流れることを確実に防止することができる。   According to the invention of claim 5, when the LED unit is disconnected from the connection means, the output voltage is maintained by continuing the ON state of the switching element for a certain time set longer than the time necessary for discharging the smoothing capacitor. Therefore, it is possible to reliably prevent overcurrent from flowing through the LED unit when the LED unit is reconnected to the connection means.

請求項６の発明によれば、直流−直流変換手段に入力された直流電圧が小さくても、昇圧回路によって、ＬＥＤを駆動させるために必要な電圧に昇圧することができる。   According to the invention of claim 6, even if the DC voltage input to the DC-DC converter is small, the voltage can be boosted to a voltage necessary for driving the LED by the booster circuit.

請求項７の発明によれば、フライバックトランスを用いた昇降圧回路によって、直流−直流変換手段の出力電圧の大きさを入力電圧の大きさに関係なく設定することができる。   According to the seventh aspect of the present invention, the magnitude of the output voltage of the DC-DC converting means can be set regardless of the magnitude of the input voltage by the step-up / step-down circuit using the flyback transformer.

請求項８の発明によれば、ＬＥＤ駆動装置において、ＬＥＤユニットを駆動しているときにＬＥＤユニットが接続手段から外れた場合に、放電手段を用いて平滑コンデンサを放電することによって、直流−直流変換手段の出力電圧を低減することができるので、ＬＥＤユニットが接続手段に再接続されたときに、ＬＥＤユニットに過電流が流れることを防止することができる。   According to the invention of claim 8, in the LED driving device, when the LED unit is detached from the connecting means while driving the LED unit, the smoothing capacitor is discharged by using the discharging means, so that the DC-DC Since the output voltage of the conversion means can be reduced, it is possible to prevent an overcurrent from flowing through the LED unit when the LED unit is reconnected to the connection means.

請求項９の発明によれば、照明装置のＬＥＤ駆動装置において、ＬＥＤユニットを駆動しているときにＬＥＤユニットが接続手段から外れた場合に、放電手段を用いて平滑コンデンサを放電することによって、直流−直流変換手段の出力電圧を低減することができるので、ＬＥＤユニットが接続手段に再接続されたときに、ＬＥＤユニットに過電流が流れることを防止することができる。   According to the invention of claim 9, in the LED drive device of the lighting device, when the LED unit is detached from the connection means when driving the LED unit, the smoothing capacitor is discharged using the discharge means, Since the output voltage of the DC-DC converting means can be reduced, it is possible to prevent an overcurrent from flowing through the LED unit when the LED unit is reconnected to the connecting means.

（実施形態１）
まず、実施形態１に係る照明装置の構成について図１を用いて説明する。この照明装置は、図１に示すように、ＬＥＤ駆動装置１と、ＬＥＤユニット２とを備えている。 (Embodiment 1)
First, the configuration of the lighting apparatus according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the lighting device includes an LED driving device 1 and an LED unit 2.

ＬＥＤユニット２は、複数個（例えば３個〜２０個程度）のＬＥＤ２０，２０・・・が直列接続されたものであり、ＬＥＤ駆動装置１によって駆動される。なお、ＬＥＤ２０の個数は、用途に応じて自由に設定することができる。また、ＬＥＤユニット２は、各ＬＥＤ２０の仕様や組み合わせによって、自由に特性を変えてもよい。   The LED unit 2 includes a plurality of (for example, about 3 to 20) LEDs 20, 20... Connected in series and is driven by the LED driving device 1. In addition, the number of LED20 can be freely set according to a use. Moreover, the LED unit 2 may freely change the characteristics depending on the specifications and combinations of the LEDs 20.

ＬＥＤ駆動装置１は、ＬＥＤユニット２を駆動するものであり、直流電源１０と、ＬＥＤユニット２が着脱可能に接続される接続手段３と、直流電源１０から供給される直流電源電力に対して電力変換を行う直流−直流変換手段４と、直流−直流変換手段４を制御する制御手段５と、ＬＥＤユニット２が接続手段３に接続されているか接続手段３から外れたかを判別する無負荷判別手段６と、直流−直流変換手段４の平滑コンデンサ４３を放電するための放電経路となる放電手段７と、放電手段７のスイッチング素子７１のオンオフを切り替えるオンオフ切替手段８とを備えている。   The LED driving device 1 drives the LED unit 2, and is a power source for the DC power source 10, the connection means 3 to which the LED unit 2 is detachably connected, and the DC power source power supplied from the DC power source 10. DC-DC converting means 4 for performing conversion, control means 5 for controlling DC-DC converting means 4, and no-load determining means for determining whether the LED unit 2 is connected to the connecting means 3 or disconnected from the connecting means 3. 6, discharge means 7 serving as a discharge path for discharging the smoothing capacitor 43 of the DC-DC conversion means 4, and on / off switching means 8 for switching on / off of the switching element 71 of the discharge means 7.

接続手段３は、高圧側の接続端子３０と、低圧側の接続端子３１とを備えている。接続端子３０にはＬＥＤユニット２の高圧側が接続され、接続端子３１にはＬＥＤユニット２の低圧側が接続される。   The connection means 3 includes a high-voltage side connection terminal 30 and a low-voltage side connection terminal 31. The connection terminal 30 is connected to the high voltage side of the LED unit 2, and the connection terminal 31 is connected to the low voltage side of the LED unit 2.

直流−直流変換手段４は、入力側（直流電源１０側）から順にインダクタ４０、スイッチング素子４１、ダイオード４２及び平滑コンデンサ４３が接続されて構成される昇圧回路である。スイッチング素子４１は、例えばＦＥＴやバイポーラトランジスタなどのパワー素子である。直流−直流変換手段４は、スイッチング素子４１のオンオフが高周波で切り替えられることによって、直流電源１０から入力された直流電圧を昇圧し、昇圧した電圧を出力電圧ＶｏｕｔとしてＬＥＤユニット２に印加する。なお、本実施形態では、直流電源１０からの直流電圧は１２Ｖである。また、ＬＥＤユニット２への出力電圧Ｖｏｕｔは３０Ｖ〜５０Ｖである。ＬＥＤユニット２に流れる駆動電流Ｉｏｕｔは０．４Ａ〜１．２Ａである。   The DC-DC converting means 4 is a booster circuit configured by connecting an inductor 40, a switching element 41, a diode 42 and a smoothing capacitor 43 in order from the input side (DC power supply 10 side). The switching element 41 is a power element such as an FET or a bipolar transistor, for example. The DC-DC converter 4 boosts the DC voltage input from the DC power supply 10 by switching on / off of the switching element 41 at a high frequency, and applies the boosted voltage to the LED unit 2 as the output voltage Vout. In the present embodiment, the DC voltage from the DC power supply 10 is 12V. The output voltage Vout to the LED unit 2 is 30V to 50V. The drive current Iout flowing through the LED unit 2 is 0.4A to 1.2A.

制御手段５は、抵抗器５０に流れる電流（駆動電流）を検出し、検出値が所定値となるように、スイッチング素子４１に対してパルス幅変調制御（ＰＷＭ制御）を行い、スイッチング素子４１のオンオフを高周波で切り替えて、出力電圧Ｖｏｕｔ（平滑コンデンサ４３の両端電圧）を可変させる。   The control means 5 detects the current (drive current) flowing through the resistor 50 and performs pulse width modulation control (PWM control) on the switching element 41 so that the detected value becomes a predetermined value. The output voltage Vout (the voltage across the smoothing capacitor 43) is varied by switching on / off at a high frequency.

また、制御手段５は、ＬＥＤユニット２が接続手段３から外れたと無負荷判断手段６で判断されたときに、スイッチング素子４１のオンオフ切替動作を停止する。   Further, the control means 5 stops the on / off switching operation of the switching element 41 when the no-load determination means 6 determines that the LED unit 2 is disconnected from the connection means 3.

無負荷判別手段６は、平滑コンデンサ４３に並列接続される２つの抵抗器６０，６１の直列回路と、上記抵抗器６０，６１による分圧電圧の大きさを検出する検出部６２とを備えている。   The no-load discrimination means 6 includes a series circuit of two resistors 60 and 61 connected in parallel to the smoothing capacitor 43, and a detection unit 62 that detects the magnitude of the divided voltage by the resistors 60 and 61. Yes.

検出部６２は、２つの閾値電圧Ｖｔ１，Ｖｔ２を持つヒステリシスの動作を行うヒステリシスコンパレータであり、正帰還をかけた回路である。具体的には、検出部６２は、ＬＥＤユニット２の定常時の定格電圧Ｖｓより高い値に上限閾値電圧Ｖｔ１（図２参照）を予め設定し、ＬＥＤユニット２の点灯開始時電圧より低い値に下限閾値電圧Ｖｔ２（図２参照）を予め設定する。   The detection unit 62 is a hysteresis comparator that performs a hysteresis operation having two threshold voltages Vt1 and Vt2, and is a circuit to which positive feedback is applied. Specifically, the detection unit 62 presets the upper limit threshold voltage Vt1 (see FIG. 2) to a value higher than the rated voltage Vs during steady operation of the LED unit 2, and sets the value lower than the lighting start voltage of the LED unit 2. A lower threshold voltage Vt2 (see FIG. 2) is set in advance.

抵抗器６２０，６２１は、正帰還のための抵抗であり、この抵抗比でヒステリシス量が設定される。出力電圧Ｖｏｕｔが上限閾値電圧Ｖｔ１になると、オペアンプ６２３の出力つまり検出部６２の出力はローレベルとなる。一方、出力電圧Ｖｏｕｔが下限閾値電圧Ｖｔ２になると、検出部６２の出力はハイレベルとなる。   Resistors 620 and 621 are resistors for positive feedback, and the amount of hysteresis is set by this resistance ratio. When the output voltage Vout becomes the upper limit threshold voltage Vt1, the output of the operational amplifier 623, that is, the output of the detection unit 62 becomes low level. On the other hand, when the output voltage Vout becomes the lower limit threshold voltage Vt2, the output of the detection unit 62 becomes high level.

上記の動作によって、検出部６２は、上限閾値電圧Ｖｔ１より出力電圧Ｖｏｕｔが小さいときはＬＥＤユニット２が接続手段３に接続されていると判別する。一方、検出部６２は、出力電圧Ｖｏｕｔが上昇して上限閾値電圧Ｖｔ１に達したときにＬＥＤユニット２が接続手段３から外れたと判別する。   By the above operation, the detection unit 62 determines that the LED unit 2 is connected to the connection unit 3 when the output voltage Vout is lower than the upper limit threshold voltage Vt1. On the other hand, the detection unit 62 determines that the LED unit 2 is disconnected from the connection means 3 when the output voltage Vout increases and reaches the upper threshold voltage Vt1.

放電手段７は、抵抗器（抵抗成分）７０とスイッチング素子７１との直列回路であり、平滑コンデンサ４３に並列に接続されている。スイッチング素子７１がオン状態になると、放電手段７は平滑コンデンサ４３の放電経路となり、平滑コンデンサ４３が抵抗器７０を介して放電する。   The discharging means 7 is a series circuit of a resistor (resistance component) 70 and a switching element 71, and is connected in parallel to the smoothing capacitor 43. When the switching element 71 is turned on, the discharge means 7 becomes a discharge path of the smoothing capacitor 43, and the smoothing capacitor 43 is discharged through the resistor 70.

オンオフ切替手段８は、入力側（検出部６２側）から順にインバータ８０と抵抗器８１とが直列に接続されたものである。無負荷検出手段６の検出部６２の出力がハイレベルであるとき、インバータ８０による反転によって、スイッチング素子７１への出力がローレベルになるため、オンオフ切替手段８は、スイッチング素子７１をオフ状態にする。一方、無負荷検出手段６の検出部６２の出力がローレベルであるとき、インバータ８０による反転によって、スイッチング素子７１への出力がハイレベルになるため、オンオフ切替手段８は、スイッチング素子７１をオン状態にする。   The on / off switching means 8 includes an inverter 80 and a resistor 81 connected in series in order from the input side (detector 62 side). When the output of the detection unit 62 of the no-load detection means 6 is at a high level, the output to the switching element 71 is at a low level due to inversion by the inverter 80, so the on / off switching means 8 puts the switching element 71 in the off state. To do. On the other hand, when the output of the detection unit 62 of the no-load detection means 6 is at low level, the output to the switching element 71 becomes high level due to inversion by the inverter 80, so the on / off switching means 8 turns on the switching element 71. Put it in a state.

上記の動作によって、オンオフ切替手段８は、ＬＥＤユニット２が接続手段３に接続されていると無負荷判別手段６で判別されたときは、スイッチング素子７１をオフ状態にする。スイッチング素子７１をオフ状態にしたオンオフ切替手段８は、ＬＥＤユニット２が接続手段３から外れたと無負荷判別手段６で判別されたときにスイッチング素子７１をオフ状態からオン状態に切り替える。   By the above operation, the on / off switching means 8 turns off the switching element 71 when the no-load determination means 6 determines that the LED unit 2 is connected to the connection means 3. The on / off switching means 8 that turns the switching element 71 off switches the switching element 71 from the off state to the on state when the no-load determination means 6 determines that the LED unit 2 has been disconnected from the connection means 3.

また、オンオフ切替手段８は、出力電圧Ｖｏｕｔが上昇して上限閾値電圧Ｖｔ１（図２参照）に達した後に下降して下限閾値電圧Ｖｔ２（図２参照）に達したとき、スイッチング素子７１をオン状態からオフ状態に切り替える。   The on / off switching means 8 turns on the switching element 71 when the output voltage Vout rises and reaches the upper limit threshold voltage Vt1 (see FIG. 2) and then falls and reaches the lower limit threshold voltage Vt2 (see FIG. 2). Switch from state to off state.

次に、本実施形態に係るＬＥＤ駆動装置１の動作について図２を用いて説明する。まず、ＬＥＤ駆動装置１が駆動開始すると（時間ｔ１）、出力電圧Ｖｏｕｔは上昇して定格電圧Ｖｓとなり、定常状態になる。定常状態時の駆動電流Ｉｏｕｔは定格電流Ｉｓである。   Next, operation | movement of the LED drive device 1 which concerns on this embodiment is demonstrated using FIG. First, when the LED driving device 1 starts driving (time t1), the output voltage Vout rises to the rated voltage Vs and enters a steady state. The drive current Iout in the steady state is the rated current Is.

その後、ＬＥＤユニット２が接続手段３から外れると（時間ｔ２）、ＬＥＤ駆動装置１は無負荷となり、直流−直流変換手段４への制御手段５の動作によって、出力電圧Ｖｏｕｔが上昇する。出力電圧Ｖｏｕｔが上限閾値電圧Ｖｔ１に達したとき（時間ｔ３）、制御手段５は直流−直流変換手段４を停止させる。このとき、オンオフ切替手段８は、スイッチング素子７１をオフ状態からオン状態に切り替える。平滑コンデンサ４３は、抵抗器７０を介する放電経路によって放電する。これにより、出力電圧Ｖｏｕｔは低下していく。   Thereafter, when the LED unit 2 is disconnected from the connection means 3 (time t2), the LED driving device 1 becomes unloaded, and the output voltage Vout increases due to the operation of the control means 5 to the DC-DC conversion means 4. When the output voltage Vout reaches the upper threshold voltage Vt1 (time t3), the control unit 5 stops the DC-DC conversion unit 4. At this time, the on / off switching means 8 switches the switching element 71 from the off state to the on state. The smoothing capacitor 43 is discharged through a discharge path through the resistor 70. As a result, the output voltage Vout decreases.

その後、出力電圧Ｖｏｕｔが下限閾値電圧Ｖｔ２になると、オンオフ切替手段８は、スイッチング素子７１をオン状態からオフ状態に切り替える。時間ｔ４以降では、出力電圧ＶｏｕｔはＬＥＤユニット２の点灯開始時電圧より低いので、ＬＥＤユニット２が接続手段３に再接続されても、ＬＥＤユニット２に過電流が流れない。   Thereafter, when the output voltage Vout becomes the lower limit threshold voltage Vt2, the on / off switching unit 8 switches the switching element 71 from the on state to the off state. After time t4, the output voltage Vout is lower than the voltage at the start of lighting of the LED unit 2. Therefore, even if the LED unit 2 is reconnected to the connection means 3, no overcurrent flows through the LED unit 2.

以上、本実施形態によれば、ＬＥＤ駆動装置１において、ＬＥＤユニット２を駆動しているときにＬＥＤユニット２が接続手段３から外れた場合に、放電手段７を用いて平滑コンデンサ４３を放電することで、直流−直流変換手段４の出力電圧Ｖｏｕｔを低減することができるので、ＬＥＤユニット２が接続手段３に再接続されたときに、ＬＥＤユニット２に過電流が流れることを防止することができる。   As described above, according to the present embodiment, in the LED drive device 1, when the LED unit 2 is detached from the connection unit 3 while driving the LED unit 2, the smoothing capacitor 43 is discharged using the discharge unit 7. As a result, since the output voltage Vout of the DC-DC converting means 4 can be reduced, it is possible to prevent an overcurrent from flowing through the LED unit 2 when the LED unit 2 is reconnected to the connecting means 3. it can.

また、本実施形態によれば、ＬＥＤユニット２が接続手段３から外れたときに発生する直流−直流変換手段４の出力電圧Ｖｏｕｔの上昇を利用して、ＬＥＤユニット２が接続手段３に接続されているか否かを判別することができる。   Further, according to the present embodiment, the LED unit 2 is connected to the connection means 3 by utilizing the increase in the output voltage Vout of the DC-DC conversion means 4 that occurs when the LED unit 2 is disconnected from the connection means 3. It can be determined whether or not.

さらに、本実施形態によれば、ＬＥＤユニット２が接続手段３から外れたときにスイッチング素子７１をオン状態にした後、出力電圧Ｖｏｕｔを下限閾値電圧Ｖｔ２まで下げることで、出力電圧ＶｏｕｔをＬＥＤユニット２の点灯開始時電圧より低くすることができるので、ＬＥＤユニット２が接続手段３に再接続されたときにＬＥＤユニット２に過電流が流れることを確実に防止することができる。なお、通常の動作では、スイッチング素子７１はオフ状態で、平滑コンデンサ４３に並列に接続されている抵抗器７０及びスイッチング素子７１の直流回路に電流が流れないので、電力ロスが発生しない。   Further, according to the present embodiment, the output voltage Vout is reduced to the lower limit threshold voltage Vt2 after the switching element 71 is turned on when the LED unit 2 is disconnected from the connection means 3, thereby reducing the output voltage Vout to the LED unit. Therefore, it is possible to reliably prevent an overcurrent from flowing through the LED unit 2 when the LED unit 2 is reconnected to the connection means 3. In normal operation, the switching element 71 is in an off state, and no current flows through the DC circuit of the resistor 70 and the switching element 71 connected in parallel to the smoothing capacitor 43, so that no power loss occurs.

また、本実施形態によれば、直流−直流変換手段４に入力された直流電圧が小さくても、昇圧回路によって、ＬＥＤユニット２を駆動させるために必要な電圧に昇圧することができる。   Further, according to the present embodiment, even if the DC voltage input to the DC-DC converter 4 is small, the voltage can be boosted to a voltage necessary for driving the LED unit 2 by the booster circuit.

（実施形態２）
実施形態２に係るＬＥＤ駆動装置１は、ＬＥＤユニット２が接続手段３から外れたときに、放電手段７のスイッチング素子７１が一定時間オン状態を継続する点で、実施形態１に係るＬＥＤ駆動装置１（図１参照）と相違する。本実施形態のＬＥＤ駆動装置１は、検出部６２及びオンオフ切替手段８に代えて、図３に示す検出部６２ａ及びオンオフ切替手段８ａを備えている。なお、図３のａ及びｂは、それぞれ図１のａ及びｂに接続される。実施形態１と同様の構成要素については、同一の符号を付して説明を省略する。 (Embodiment 2)
The LED drive device 1 according to the second embodiment is different from the LED drive device 1 according to the first embodiment in that the switching element 71 of the discharge means 7 is kept on for a certain period of time when the LED unit 2 is disconnected from the connection means 3. 1 (see FIG. 1). The LED drive device 1 of this embodiment includes a detection unit 62a and an on / off switching unit 8a shown in FIG. 3 instead of the detection unit 62 and the on / off switching unit 8. Note that a and b in FIG. 3 are connected to a and b in FIG. 1, respectively. Constituent elements similar to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

検出部６２ａは、図３に示すように、抵抗器６２４，６２５，６２６及びオペアンプ６２７からなる回路である。   As shown in FIG. 3, the detection unit 62 a is a circuit including resistors 624, 625, 626 and an operational amplifier 627.

オンオフ切替手段８ａは、タイマＩＣ８２と、抵抗器８３，８４と、コンデンサ８５とを備えている。タイマＩＣ８２は、単安定マルチバイブレータ（ワンショットパルス発生回路）として用いられる。オンオフ切替手段８ａは、ＬＥＤユニット２が接続手段３から外れたと無負荷判別手段６で判別されてスイッチング素子７１をオフ状態からオン状態に切り替えた後、平滑コンデンサ４３を放電させるために必要な時間以上に設定された一定時間Ｔ、上記スイッチング素子７１のオン状態を継続させる。   The on / off switching means 8 a includes a timer IC 82, resistors 83 and 84, and a capacitor 85. The timer IC 82 is used as a monostable multivibrator (one-shot pulse generation circuit). The on / off switching means 8a is a time required for discharging the smoothing capacitor 43 after the no-load discrimination means 6 determines that the LED unit 2 has been disconnected from the connection means 3 and switches the switching element 71 from the OFF state to the ON state. The switching element 71 is kept on for a certain time T set as described above.

一定期間Ｔは、抵抗器８４及びコンデンサ８５の定数によって、出力電圧Ｖｏｕｔが十分に低下するように平滑コンデンサ４３の容量及び抵抗器７０の抵抗値を考慮して決定されている。上記より、一定期間Ｔは、抵抗器８４及びコンデンサ８５の定数を変えることによって、広範囲に設定することができるが、ＬＥＤユニット２と接続手段３との接続不良によって接続と切断が繰り返されるチャタリングを考慮すると、数ミリ秒〜数十ミリ秒程度が好ましい。   The fixed period T is determined by considering the capacitance of the smoothing capacitor 43 and the resistance value of the resistor 70 so that the output voltage Vout is sufficiently reduced by the constants of the resistor 84 and the capacitor 85. From the above, the constant period T can be set over a wide range by changing the constants of the resistor 84 and the capacitor 85. In consideration, several milliseconds to several tens of milliseconds are preferable.

本実施形態では、図５に示すように、ＬＥＤ駆動装置１が駆動開始し（時間ｔ１１）、ＬＥＤユニット２が接続手段３から外れた後（時間ｔ１２）、出力電圧Ｖｏｕｔが上限閾値電圧Ｖｔ１に達すると（時間ｔ１３）、検出部６２ａの出力信号Ｖ１がローレベルになり、タイマＩＣ８２が動作する。期間ｔ１３〜ｔ１６において、タイマＩＣ８２は、出力信号Ｖ２を一定期間Ｔ継続してハイレベルにすることによって、スイッチング素子７１をオン状態にする（図４参照）。   In the present embodiment, as shown in FIG. 5, after the LED driving device 1 starts driving (time t11) and the LED unit 2 is disconnected from the connecting means 3 (time t12), the output voltage Vout becomes the upper threshold voltage Vt1. When it reaches (time t13), the output signal V1 of the detector 62a becomes low level, and the timer IC 82 operates. In the period t13 to t16, the timer IC 82 keeps the switching element 71 on by keeping the output signal V2 at the high level for a certain period T (see FIG. 4).

以上、本実施形態によれば、ＬＥＤユニット２が接続手段３から外れたときに平滑コンデンサ４３を放電させるために必要な時間以上に設定された一定時間Ｔ、スイッチング素子７１のオン状態を継続させることによって、出力電圧Ｖｏｕｔを０になるまで低減させることができるので、ＬＥＤユニット２が接続手段３に再接続されたときにＬＥＤユニット２に過電流が流れることを確実に防止することができる。   As described above, according to the present embodiment, when the LED unit 2 is disconnected from the connection means 3, the switching element 71 is kept on for a certain time T set to be longer than the time necessary for discharging the smoothing capacitor 43. Thus, since the output voltage Vout can be reduced to 0, it is possible to reliably prevent an overcurrent from flowing through the LED unit 2 when the LED unit 2 is reconnected to the connection means 3.

（実施形態３）
実施形態３に係るＬＥＤ駆動装置１は、ＬＥＤ駆動装置１が無負荷であるか否かを駆動電流Ｉｏｕｔによって判別する点で、実施形態１に係るＬＥＤ駆動装置１（図１参照）と相違する。本実施形態のＬＥＤ駆動装置１は、検出部６２及びオンオフ切替手段８に代えて、図６に示す検出部６２ａ及びオンオフ切替手段８ｂを備えている。なお、図６のｃ及びｄは、それぞれ図１のｃ及びｄに接続される。実施形態１と同様の構成要素については、同一の符号を付して説明を省略する。 (Embodiment 3)
The LED driving device 1 according to the third embodiment is different from the LED driving device 1 according to the first embodiment (see FIG. 1) in that the LED driving device 1 determines whether or not the LED driving device 1 is unloaded based on the driving current Iout. . The LED drive device 1 according to the present embodiment includes a detection unit 62a and an on / off switching unit 8b shown in FIG. 6 instead of the detection unit 62 and the on / off switching unit 8. Note that c and d in FIG. 6 are connected to c and d in FIG. 1, respectively. Constituent elements similar to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

本実施形態の検出部６２ａは、図６に示すように、直流−直流変換手段４からＬＥＤユニット２に駆動電流Ｉｏｕｔが流れているときはＬＥＤユニット２が接続手段３に接続されていると判別する。一方、直流−直流変換手段４からＬＥＤユニット２に駆動電流Ｉｏｕｔが流れなくなったときに、検出部６２ａは、ＬＥＤユニット２が接続手段３から外れたと判別する。   As shown in FIG. 6, the detection unit 62 a of this embodiment determines that the LED unit 2 is connected to the connection unit 3 when the drive current Iout flows from the DC-DC conversion unit 4 to the LED unit 2. To do. On the other hand, when the drive current Iout no longer flows from the DC-DC converter 4 to the LED unit 2, the detection unit 62 a determines that the LED unit 2 has been disconnected from the connection unit 3.

本実施形態のオンオフ切替手段８ｂは、タイマＩＣ８２、抵抗器８３，８４及びコンデンサ８５をオンオフ切替手段８ａと同様に備えているとともに、検出部６２ａの出力側とタイマＩＣ８２との間にインバータ８６を備えている。   The on / off switching unit 8b of the present embodiment includes a timer IC 82, resistors 83 and 84, and a capacitor 85 in the same manner as the on / off switching unit 8a, and an inverter 86 between the output side of the detection unit 62a and the timer IC 82. I have.

本実施形態では、図８に示すように、ＬＥＤ駆動装置１が駆動開始し（時間ｔ２１）、ＬＥＤユニット２が接続手段３から外れたときに（時間ｔ２２）、抵抗器５０に流れる駆動電流Ｉｏｕｔは０になったことを制御手段５が検出する。期間ｔ２２〜ｔ２５において、タイマＩＣ８２は、スイッチング素子７１を一定期間Ｔ継続してオン状態にする。検出部６２ａは、駆動電流Ｉｏｕｔが０になって検出電圧が低くなると、出力信号Ｖ１がハイレベルになる。インバータ８６は、検出部６２ａからの出力信号Ｖ１を反転させてタイマＩＣ８２のトリガ信号Ｖ３を生成する。タイマＩＣ８２は、ハイレベルの出力信号Ｖ２を印加してスイッチング素子７１を一定期間Ｔ継続してオン状態にする（図７参照）。   In the present embodiment, as shown in FIG. 8, when the LED driving device 1 starts driving (time t21) and the LED unit 2 is disconnected from the connection means 3 (time t22), the driving current Iout that flows through the resistor 50 is displayed. Is detected by the control means 5. In the period t22 to t25, the timer IC 82 keeps the switching element 71 on for a certain period T. In the detection unit 62a, when the drive current Iout becomes 0 and the detection voltage becomes low, the output signal V1 becomes high level. The inverter 86 inverts the output signal V1 from the detection unit 62a to generate the trigger signal V3 of the timer IC 82. The timer IC 82 applies the high-level output signal V2 to turn on the switching element 71 for a certain period T (see FIG. 7).

以上、本実施形態によれば、ＬＥＤユニット２が接続手段３に接続されているか否かを駆動電流Ｉｏｕｔで判別することによって、ＬＥＤユニット２が接続手段３から外れたときに、すぐにその旨を判別することができる。   As described above, according to the present embodiment, when the LED unit 2 is disconnected from the connection means 3 by determining whether or not the LED unit 2 is connected to the connection means 3 by the drive current Iout, the fact is immediately indicated. Can be determined.

（実施形態４）
実施形態４に係るＬＥＤ駆動装置１は、図９に示すように、直流−直流変換手段４ａが昇降圧回路である点で、実施形態１に係るＬＥＤ駆動装置１（図１参照）と相違する。つまり、本実施形態のＬＥＤ駆動装置１は、直流−直流変換手段４に代えて、図９に示す直流−直流変換手段４ａを備えている。なお、図９のｃ，ｄ，ｅ，ｆは、それぞれ図１のｃ，ｄ，ｅ，ｆに接続される。実施形態１と同様の構成要素については、同一の符号を付して説明を省略する。 (Embodiment 4)
As shown in FIG. 9, the LED drive device 1 according to the fourth embodiment is different from the LED drive device 1 according to the first embodiment (see FIG. 1) in that the DC-DC conversion unit 4 a is a step-up / down circuit. . That is, the LED drive device 1 according to the present embodiment includes a DC-DC conversion unit 4 a shown in FIG. 9 instead of the DC-DC conversion unit 4. Note that c, d, e, and f in FIG. 9 are connected to c, d, e, and f in FIG. 1, respectively. Constituent elements similar to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

本実施形態の直流−直流変換手段４ａは、フライバックトランス４４と、フライバックトランス４４の一次側に接続されたスイッチング素子４１と、フライバックトランス４４の二次側に接続されたダイオード４２及び平滑コンデンサ４３とを備えている。直流−直流変換手段４ａは、直流電源１０から入力された直流電圧を昇圧又は降圧する。   The DC-DC converting means 4a of this embodiment includes a flyback transformer 44, a switching element 41 connected to the primary side of the flyback transformer 44, a diode 42 connected to the secondary side of the flyback transformer 44, and a smoothing circuit. And a capacitor 43. The DC / DC converting means 4a boosts or steps down the DC voltage input from the DC power supply 10.

以上、本実施形態によれば、フライバックトランス４４を用いた昇降圧回路によって、直流−直流変換手段４ａの出力電圧Ｖｏｕｔの大きさを入力電圧の大きさに関係なく設定することができる。   As described above, according to the present embodiment, the magnitude of the output voltage Vout of the DC-DC converting means 4a can be set by the step-up / step-down circuit using the flyback transformer 44 regardless of the magnitude of the input voltage.

なお、実施形態１〜４では、放電手段７の抵抗成分として抵抗器７０を用いているが、実施形態１〜４の変形例として、抵抗器７０に代えて、電荷を消費する機能を有する他の素子（抵抗成分を有する素子）を用いてもよい。   In the first to fourth embodiments, the resistor 70 is used as the resistance component of the discharging means 7. However, as a modification of the first to fourth embodiments, the resistor 70 is replaced with a function of consuming charges. These elements (elements having a resistance component) may be used.

また、実施形態１〜４では、無負荷判別手段６は、出力電圧Ｖｏｕｔや駆動電流Ｉｏｕｔを検出しているが、実施形態１〜４の変形例として、出力電圧Ｖｏｕｔや駆動電流Ｉｏｕｔではなく、接続手段３の機構的なものであってもよい。   In the first to fourth embodiments, the no-load determination unit 6 detects the output voltage Vout and the drive current Iout. However, as a modification of the first to fourth embodiments, instead of the output voltage Vout and the drive current Iout, The mechanism of the connection means 3 may be used.

さらに、実施形態１〜４の変形例として、制御手段５、無負荷判別手段６の検出部６２、オンオフ切替手段８，８ａ，８ｂは、マイクロコンピュータなどを用いた回路であってもよい。このような回路であっても、実施形態１〜４と同様の動作をさせればよい。   Furthermore, as a modification of the first to fourth embodiments, the control unit 5, the detection unit 62 of the no-load determination unit 6, and the on / off switching units 8, 8a, and 8b may be circuits using a microcomputer or the like. Even such a circuit may be operated in the same manner as in the first to fourth embodiments.

また、実施形態１〜４の照明装置は、器具本体に保持して照明器具を構成することができる。   Moreover, the illuminating device of Embodiments 1-4 can be hold | maintained at an instrument main body, and can comprise a luminaire.

実施形態１に係る照明装置の回路図である。1 is a circuit diagram of a lighting device according to Embodiment 1. FIG. 同上に係るＬＥＤ駆動装置の動作を説明する図である。It is a figure explaining operation | movement of the LED drive device which concerns on the same as the above. 実施形態２に係る照明装置の要部の回路図である。It is a circuit diagram of the principal part of the illuminating device which concerns on Embodiment 2. FIG. 同上の信号状態を示す図である。It is a figure which shows a signal state same as the above. 同上に係るＬＥＤ駆動装置の動作を説明する図である。It is a figure explaining operation | movement of the LED drive device which concerns on the same as the above. 実施形態３に係る照明装置の要部の回路図である。It is a circuit diagram of the principal part of the illuminating device which concerns on Embodiment 3. FIG. 同上の信号状態を示す図である。It is a figure which shows a signal state same as the above. 同上に係るＬＥＤ駆動装置の動作を説明する図である。It is a figure explaining operation | movement of the LED drive device which concerns on the same as the above. 実施形態４に係る照明装置の要部の回路図である。It is a circuit diagram of the principal part of the illuminating device which concerns on Embodiment 4. 従来例の照明装置の回路図である。It is a circuit diagram of the illuminating device of a prior art example. 同上のＬＥＤ駆動装置の動作を説明する図である。It is a figure explaining operation | movement of a LED drive device same as the above.

符号の説明Explanation of symbols

１ ＬＥＤ駆動装置
１０ 直流電源
２ ＬＥＤユニット
２０ ＬＥＤ
３ 接続手段
４，４ａ 直流−直流変換手段
４３ 平滑コンデンサ
４４ フライバックトランス
６ 無負荷判別手段
７ 放電手段
７０ 抵抗器
７１ スイッチング素子
８，８ａ，８ｂ オンオフ切替手段
Ｖｏｕｔ 出力電圧
Ｖｔ１ 上限閾値電圧
Ｖｔ２ 下限閾値電圧
Ｉｏｕｔ 駆動電流 DESCRIPTION OF SYMBOLS 1 LED drive device 10 DC power supply 2 LED unit 20 LED
3 connecting means 4 and 4a DC-DC converting means 43 smoothing capacitor 44 flyback transformer 6 no load judging means 7 discharging means 70 resistor 71 switching elements 8, 8a and 8b on / off switching means Vout output voltage Vt1 upper limit threshold voltage Vt2 lower limit threshold Voltage Iout Drive current

Claims (9)

直流電源から電源供給を受けて、複数個のＬＥＤが直列接続されたＬＥＤユニットを駆動するＬＥＤ駆動装置であって、
前記ＬＥＤユニットが着脱可能に接続される接続手段と、
出力側に平滑コンデンサを有し、前記直流電源から供給される直流電源電力に対して電力変換を行い、出力電圧をＬＥＤユニットに印加する直流−直流変換手段と、
前記ＬＥＤユニットが前記接続手段に接続されているか当該ＬＥＤユニットが当該接続手段から外れたかを判別する無負荷判別手段と、
抵抗成分とスイッチング素子との直列回路であり、前記平滑コンデンサに並列に接続され、当該平滑コンデンサを放電するための放電経路となる放電手段と、
前記スイッチング素子のオンオフを切り替えるオンオフ切替手段とを備え、
前記オンオフ切替手段は、前記ＬＥＤユニットが前記接続手段に接続されていると前記無負荷判別手段で判別されたときは前記スイッチング素子をオフ状態にし、前記ＬＥＤユニットが前記接続手段から外れたと前記無負荷判別手段で判別されたときに前記スイッチング素子をオフ状態からオン状態に切り替える
ことを特徴とするＬＥＤ駆動装置。 An LED driving device that receives power supply from a DC power source and drives an LED unit in which a plurality of LEDs are connected in series,
A connection means for detachably connecting the LED unit;
DC-DC conversion means that has a smoothing capacitor on the output side, performs power conversion on DC power supplied from the DC power supply, and applies an output voltage to the LED unit;
No-load determination means for determining whether the LED unit is connected to the connection means or whether the LED unit is disconnected from the connection means;
A series circuit of a resistance component and a switching element, connected in parallel to the smoothing capacitor, and a discharge means serving as a discharge path for discharging the smoothing capacitor;
An on / off switching means for switching on / off of the switching element;
The on / off switching means turns off the switching element when the no-load determination means determines that the LED unit is connected to the connection means, and turns off the switching element when the LED unit is disconnected from the connection means. An LED driving device characterized in that the switching element is switched from an off state to an on state when determined by a load determining means. 前記無負荷判別手段は、前記ＬＥＤユニットの定常時の定格電圧より高い値に閾値電圧を予め設定し、当該閾値電圧より前記出力電圧が小さいときは前記ＬＥＤユニットが前記接続手段に接続されていると判別し、前記出力電圧が上昇して前記閾値電圧に達したときに前記ＬＥＤユニットが前記接続手段から外れたと判別することを特徴とする請求項１記載のＬＥＤ駆動装置。   The no-load discrimination means presets a threshold voltage to a value higher than the rated voltage of the LED unit in a steady state, and when the output voltage is smaller than the threshold voltage, the LED unit is connected to the connection means. The LED driving device according to claim 1, wherein when the output voltage increases and reaches the threshold voltage, it is determined that the LED unit is disconnected from the connection means. 前記無負荷判別手段は、前記直流−直流変換手段から前記ＬＥＤユニットに駆動電流が流れているときは前記ＬＥＤユニットが前記接続手段に接続されていると判別し、前記直流−直流変換手段から前記ＬＥＤユニットに前記駆動電流が流れなくなったときに前記ＬＥＤユニットが前記接続手段から外れたと判別することを特徴とする請求項１記載のＬＥＤ駆動装置。   The no-load determination means determines that the LED unit is connected to the connection means when a drive current flows from the DC-DC conversion means to the LED unit, and from the DC-DC conversion means, 2. The LED driving device according to claim 1, wherein when the driving current stops flowing to the LED unit, it is determined that the LED unit is disconnected from the connection means. 前記オンオフ切替手段は、前記ＬＥＤユニットの点灯開始時電圧より低い値に下限閾値電圧を予め設定し、前記出力電圧が上昇して前記閾値電圧に達した後に下降して前記下限閾値電圧に達したとき、前記スイッチング素子をオン状態からオフ状態に切り替えることを特徴とする請求項２記載のＬＥＤ駆動装置。   The on / off switching means presets a lower limit threshold voltage to a value lower than the lighting start voltage of the LED unit, the output voltage rises and reaches the threshold voltage, and then falls to reach the lower limit threshold voltage The LED driving device according to claim 2, wherein the switching element is switched from an on state to an off state. 前記オンオフ切替手段は、前記ＬＥＤユニットが前記接続手段から外れたと前記無負荷判別手段で判別されて前記スイッチング素子をオフ状態からオン状態に切り替えた後、前記平滑コンデンサを放電させるために必要な時間以上に設定された一定時間、当該スイッチング素子のオン状態を継続させることを特徴とする請求項１乃至３の何れか１項に記載のＬＥＤ駆動装置。   The on / off switching means determines the time required for discharging the smoothing capacitor after the no-load determination means determines that the LED unit is disconnected from the connection means and switches the switching element from the off state to the on state. 4. The LED driving device according to claim 1, wherein the switching element is kept on for a certain period of time set as described above. 前記直流−直流変換手段は、入力された直流電圧を昇圧する昇圧回路であることを特徴とする請求項１乃至５の何れか１項に記載のＬＥＤ駆動装置。   6. The LED driving apparatus according to claim 1, wherein the DC-DC converter is a booster circuit that boosts an input DC voltage. 前記直流−直流変換手段は、フライバックトランスを用いた昇降圧回路であり、当該昇降圧回路は、入力された直流電圧を昇圧又は降圧することを特徴とする請求項１乃至５の何れか１項に記載のＬＥＤ駆動装置。   6. The DC-DC converting means is a step-up / step-down circuit using a flyback transformer, and the step-up / step-down circuit boosts or steps down an input DC voltage. LED drive device of clause. 請求項１乃至７の何れか１項に記載のＬＥＤ駆動装置と、
複数個のＬＥＤが直列接続され前記ＬＥＤ駆動装置によって駆動されるＬＥＤユニットと
を備えることを特徴とする照明装置。 The LED driving device according to any one of claims 1 to 7,
A plurality of LEDs connected in series and driven by the LED driving device. 請求項８記載の照明装置と、
前記照明装置を保持する器具本体と
を備えることを特徴とする照明器具。 The lighting device according to claim 8;
A lighting fixture comprising: a fixture main body for holding the lighting device.
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Cited By (36)

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Publication number Priority date Publication date Assignee Title
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JP2013219963A (en) * 2012-04-11 2013-10-24 Mitsubishi Electric Corp Power-supply device and lighting apparatus
JP2013218800A (en) * 2012-04-04 2013-10-24 Sharp Corp Power supply and luminaire
KR101327063B1 (en) * 2011-12-22 2013-11-07 엘지이노텍 주식회사 Circuit for driving lighting
JP2013243103A (en) * 2012-05-21 2013-12-05 Taida Electronic Ind Co Ltd Open circuit protecting circuit, open circuit protecting method, and illuminating apparatus
JP2013247032A (en) * 2012-05-28 2013-12-09 Mitsubishi Electric Corp Lighting fixture
EP2741583A1 (en) 2012-12-04 2014-06-11 Panasonic Corporation Lighting device and luminaire including the same
JP2016058289A (en) * 2014-09-11 2016-04-21 岩崎電気株式会社 Led power source and led illumination device
US9414451B2 (en) 2013-12-18 2016-08-09 Panasonic Intellectual Property Management Co., Ltd. Lighting device and luminaire
WO2017168933A1 (en) * 2016-03-28 2017-10-05 株式会社ケーヒン Light illumination control device
WO2019233969A1 (en) * 2018-06-07 2019-12-12 Signify Holding B.V. A led driver and a led module for use with the driver

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051548A (en) * 2000-07-31 2002-02-15 Matsushita Electric Works Ltd Power supply and discharge lamp lighting device
JP2002159172A (en) * 2000-11-15 2002-05-31 Matsushita Electric Works Ltd Power source and discharge lamp lighting device
JP2006210271A (en) * 2005-01-31 2006-08-10 Matsushita Electric Works Ltd Led driving device and lighting device using it
JP2007026831A (en) * 2005-07-14 2007-02-01 Matsushita Electric Works Ltd High pressure discharge lamp lighting device, and lighting apparatus
JP2007287617A (en) * 2006-04-20 2007-11-01 Tamura Seisakusho Co Ltd Driving circuit of light-emitting element and lighting system
JP2008060604A (en) * 2007-10-31 2008-03-13 Matsushita Electric Works Ltd Vehicle-mounted headlight

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051548A (en) * 2000-07-31 2002-02-15 Matsushita Electric Works Ltd Power supply and discharge lamp lighting device
JP2002159172A (en) * 2000-11-15 2002-05-31 Matsushita Electric Works Ltd Power source and discharge lamp lighting device
JP2006210271A (en) * 2005-01-31 2006-08-10 Matsushita Electric Works Ltd Led driving device and lighting device using it
JP2007026831A (en) * 2005-07-14 2007-02-01 Matsushita Electric Works Ltd High pressure discharge lamp lighting device, and lighting apparatus
JP2007287617A (en) * 2006-04-20 2007-11-01 Tamura Seisakusho Co Ltd Driving circuit of light-emitting element and lighting system
JP2008060604A (en) * 2007-10-31 2008-03-13 Matsushita Electric Works Ltd Vehicle-mounted headlight

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US9451679B2 (en) 2010-08-25 2016-09-20 Panasonic Intellectual Property Management Co., Ltd. Illuminating light communication device
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