JP2015216031A - Lighting device for led illumination device and led illumination device - Google Patents
Lighting device for led illumination device and led illumination device Download PDFInfo
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Abstract
Description
本発明は、ＬＥＤに流れる電流を検出して出力を制御するＬＥＤ照明装置用の点灯装置、及び、そのような点灯装置を備えるＬＥＤ照明装置に関するものである。 The present invention relates to a lighting device for an LED lighting device that detects an electric current flowing through an LED and controls an output, and an LED lighting device including such a lighting device.
照明分野においては、ＬＥＤ（Light Emitting Diode）素子が盛んに使用され、その用途も多様化している。ＬＥＤ素子は、白熱電球と比べ長寿命で応答性が速く、構造上コンパクトに実装できる。また、各種の色が簡単に実現でき、調光による点灯制御も容易である。そして、灯具などの照明器具は、薄型化が可能になり、立体的に実装できることにより、自由な形状の設計が可能になる等の利点がある。 In the lighting field, LED (Light Emitting Diode) elements are actively used and their uses are diversified. LED elements have a longer life and faster response than incandescent bulbs, and can be mounted compactly in structure. Moreover, various colors can be easily realized, and lighting control by dimming is easy. And lighting fixtures, such as a lamp, can be reduced in thickness, and since it can be mounted in three dimensions, there is an advantage that a free shape can be designed.
上述した照明器具は、ＬＥＤ素子と、ＬＥＤ素子を点灯させる点灯装置とが、照明装置に保持されて構成されている。この点灯装置は、複数のＬＥＤ素子から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素子を均一な明るさで点灯させる。 The luminaire described above is configured such that an LED element and a lighting device that lights the LED element are held by the lighting device. This lighting device lights a plurality of LED elements with uniform brightness by supplying a constant current to a light source composed of the plurality of LED elements.
そして、ＬＥＤ駆動装置には、入力電圧が変動しても出力電圧が一定範囲に収まるように制御するために、様々な構成のＤＣ／ＤＣコンバータが用いられる。 例えば、昇圧チョッパ回路と降圧チョッパ回路とのそれぞれを独立に備えて、昇圧チョッパ回路の後段に降圧チョッパ回路を配した構成も提案されている（特許文献１参照）。 In the LED driving device, DC / DC converters having various configurations are used in order to control the output voltage within a certain range even when the input voltage varies. For example, a configuration has been proposed in which a step-up chopper circuit and a step-down chopper circuit are provided independently, and a step-down chopper circuit is arranged at the subsequent stage of the step-up chopper circuit (see Patent Document 1).
ところで図４に示すように、ＬＥＤ素子は、順方向電圧Ｖｆが閾値電圧を超えて高くなると、順方向電流Ｉｆの変動に対して順方向電圧Ｖｆの変動が小さくなり、順方向電圧Ｖｆは略一定値になる。一例として、順方向電流Ｉｆの定常の使用範囲（数百ｍＡ程度）では、順方向電圧Ｖｆ＝３〜４Ｖ程度になって、ほぼ定電圧特性を示す（順方向電流Ｉｆが変化しても、順方向電圧Ｖｆはあまり変動しない）。 As shown in FIG. 4, in the LED element, when the forward voltage Vf becomes higher than the threshold voltage, the fluctuation of the forward voltage Vf becomes small with respect to the fluctuation of the forward current If, and the forward voltage Vf is substantially equal. It becomes a constant value. As an example, in the normal use range (about several hundred mA) of the forward current If, the forward voltage Vf is about 3 to 4 V, and almost constant voltage characteristics are exhibited (even if the forward current If changes, The forward voltage Vf does not vary much).
そして、車載用途などのバッテリ電源を使用するＬＥＤ駆動装置では、入力電圧が使用環境や他の負荷のオン・オフなどによって変動する。ＬＥＤ駆動装置では、この入力電圧の変動に対して出力電圧を一定にするように、定電圧制御を行う。一方、ＬＥＤユニットにおいても、上述のようにＬＥＤ素子そのものが定電圧特性を有しているため、ＬＥＤ電流がある程度大きい領域では略一定の両端電圧を維持する。 In an LED drive device that uses a battery power source for in-vehicle use or the like, the input voltage varies depending on the use environment, on / off of other loads, and the like. In the LED driving device, constant voltage control is performed so that the output voltage is constant with respect to the fluctuation of the input voltage. On the other hand, also in the LED unit, since the LED element itself has a constant voltage characteristic as described above, a substantially constant voltage across both ends is maintained in a region where the LED current is large to some extent.
しかしながら、ＬＥＤ駆動装置を昇圧チョッパ回路と降圧チョッパ回路とで構成した場合、入力電圧の投入時、遮断時に、昇圧チョッパ回路と降圧チョッパ回路との各動作開始タイミングによって、降圧チョッパ回路が停止した状態で昇圧チョッパ回路のみが動作することがある。このような場合、ＬＥＤ駆動装置では、昇圧チョッパ回路による高い昇圧チョッパ電圧が降圧されることなく出力電圧として出力され、出力電圧のエネルギー変化はＬＥＤ電流の変化としてあらわれる。すなわち、ＬＥＤ電流Ｉ１が瞬時的に増大して、ＬＥＤユニットに過電流が流れる。例えば、図４の順方向電圧Ｖｆがほぼ定電圧特性を示す領域において、順方向電圧Ｖｆの微小増大分ΔＶｆに対して、順方向電流Ｉｆの増大分ΔＩｆは比較的大きくなり、ＬＥＤユニットに過電流が流れる。 However, when the LED driving device is composed of a step-up chopper circuit and a step-down chopper circuit, the step-down chopper circuit is stopped by the operation start timing of the step-up chopper circuit and the step-down chopper circuit when the input voltage is turned on and off. Only the step-up chopper circuit may operate. In such a case, in the LED driving device, a high boost chopper voltage by the boost chopper circuit is output as an output voltage without being stepped down, and an energy change in the output voltage appears as a change in the LED current. That is, the LED current I1 increases instantaneously and an overcurrent flows through the LED unit. For example, in the region where the forward voltage Vf of FIG. 4 shows a substantially constant voltage characteristic, the increase ΔIf of the forward current If is relatively large with respect to the minute increase ΔVf of the forward voltage Vf. Current flows.
このように、ＬＥＤユニットに過電流が流れると、ＬＥＤユニットが破壊される虞があり、該降圧チョッパ回路がＬＥＤユニットを保護するという働きを確実に果たしているとはいえない。 Thus, if an overcurrent flows through the LED unit, the LED unit may be destroyed, and it cannot be said that the step-down chopper circuit reliably performs the function of protecting the LED unit.
本発明は、上記事由に鑑みてなされたものであり、その解決しようとする課題は、ＬＥＤユニットに直流電力を供給する点灯装置の点灯回路が昇圧チョッパ回路と過電圧保護回路とで構成され、従来ＬＥＤユニット保護のため駆動する降圧チョッパ回路を不要とし、該降圧チョッパ回路で消費されていた電力を不要として省電力化を実現すると共に過電流によるＬＥＤ素子の破損を防止することができるＬＥＤ照明装置用の点灯装置、及び、そのような点灯装置を備えるＬＥＤ照明装置を提供することにある。 The present invention has been made in view of the above-mentioned reasons, and the problem to be solved is that a lighting circuit of a lighting device for supplying DC power to an LED unit is configured by a boost chopper circuit and an overvoltage protection circuit. An LED lighting device that eliminates the need for a step-down chopper circuit that is driven to protect the LED unit, eliminates the power consumed in the step-down chopper circuit, saves power, and prevents damage to the LED element due to overcurrent It is providing the lighting device for LED and the LED lighting apparatus provided with such a lighting device.
本発明は、上記の課題を解決するための第１の手段として、ＬＥＤユニットに直流電力を供給するＬＥＤ照明装置用の点灯装置であって、この点灯装置の点灯回路は、昇圧チョッパ回路と、この昇圧チョッパ回路に接続される過電圧保護回路と、を備えることを特徴とするＬＥＤ照明装置の点灯装置を提供するものである。 The present invention is a lighting device for an LED lighting device that supplies direct current power to an LED unit as a first means for solving the above-described problem, and the lighting circuit of the lighting device includes a boost chopper circuit, An overvoltage protection circuit connected to the step-up chopper circuit is provided, and a lighting device for an LED lighting device is provided.
本発明は、上記の課題を解決するための第２の手段として、上記第１の解決手段において、点灯装置の点灯回路に印加される入力電圧は１００Ｖ乃至２００Ｖであり、昇圧チョッパ回路の出力電圧は略４００Ｖであることを特徴とするＬＥＤ照明装置用の点灯装置を提供するものである。 According to the present invention, as a second means for solving the above-described problem, in the first solution means, an input voltage applied to a lighting circuit of a lighting device is 100 V to 200 V, and an output voltage of a boost chopper circuit Provides a lighting device for an LED lighting device, characterized in that it is approximately 400V.
本発明は、上記の課題を解決するための第３の手段として、上記第１又は第２のいずれかの解決手段において、過電圧保護回路は、昇圧チョッパ回路の出力電圧が所定の電圧を超えた場合でも、過電圧保護回路の出力電圧が、昇圧チョッパ回路の所定の出力電圧となるように抑えることを特徴とするＬＥＤ照明装置用の点灯装置を提供するものである。 According to the present invention, as a third means for solving the above-described problem, in either the first or the second solving means, the overvoltage protection circuit has an output voltage of the boost chopper circuit exceeding a predetermined voltage. Even in this case, the present invention provides a lighting device for an LED lighting device, wherein the output voltage of the overvoltage protection circuit is suppressed to be a predetermined output voltage of the step-up chopper circuit.
本発明は、上記の課題を解決するための第４の手段として、上記第１乃至第３のいずれかの解決手段において、過電圧保護回路は、ツェナーダイオードを主として構成されていることを特徴とするＬＥＤ照明装置用の点灯装置を提供するものである。 According to the present invention, as a fourth means for solving the above-described problems, in any one of the first to third solving means, the overvoltage protection circuit is mainly composed of a Zener diode. A lighting device for an LED lighting device is provided.
本発明は、上記の課題を解決するための第５の手段として、上記第１乃至第４のいずれかの解決手段であるＬＥＤ照明装置用の点灯装置を備えるＬＥＤ照明装置を提供するものである。 The present invention provides, as a fifth means for solving the above-described problem, an LED lighting apparatus including a lighting device for an LED lighting apparatus, which is any one of the first to fourth solving means. .
以上説明したように、本発明では、ＬＥＤユニットに直流電力を供給する点灯装置の点灯回路が昇圧チョッパ回路と、この昇圧チョッパ回路に接続され出力電圧が該昇圧チョッパ回路の所定の出力電圧となるように抑える過電圧保護回路で構成されているため、何らかの不具合で昇圧チョッパ回路の出力がＬＥＤユニットを点灯させるための所定の電圧（点灯電圧）を超えた場合でも、過電圧保護回路の出力電圧を昇圧チョッパ回路から本来出力されるべきＬＥＤユニットを点灯させるために必要な所定の電圧に抑えることができ、これにより、ＬＥＤユニットが過電圧から保護される実益がある。 As described above, in the present invention, the lighting circuit of the lighting device that supplies DC power to the LED unit is the boost chopper circuit, and the output voltage connected to the boost chopper circuit becomes the predetermined output voltage of the boost chopper circuit. The overvoltage protection circuit is configured to suppress the output voltage of the overvoltage protection circuit even if the output of the boost chopper circuit exceeds a predetermined voltage (lighting voltage) for lighting the LED unit due to some problem. It can be suppressed to a predetermined voltage necessary for lighting the LED unit that is supposed to be output from the chopper circuit, and there is an actual advantage that the LED unit is protected from overvoltage.
この場合、本発明によれば、上記のように、過電圧保護回路を、受動素子であるツェナーダイオードから構成しているため、従来用いられていた能動素子である高圧チョッパ回路と異なり、駆動電力が不要であり、降圧チョッパ回路を不要として該降圧チョッパ回路で消費されていた電力を不要とすることができるので、消費電力を少なく抑えることができる実益がある。 In this case, according to the present invention, as described above, since the overvoltage protection circuit is configured by a Zener diode that is a passive element, the driving power is different from a high-voltage chopper circuit that is an active element conventionally used. Since it is unnecessary and the power consumed by the step-down chopper circuit can be made unnecessary without using the step-down chopper circuit, there is an advantage that the power consumption can be reduced.
以下、本発明の詳細を図示の実施形態によって説明する。 The details of the present invention will be described below with reference to the illustrated embodiments.
図１は、本発明に係わる実施例のＬＥＤ照明装置用の点灯装置１を示す。この点灯装置１は、図１に示すように、電源回路４から出力される直流電圧を入力電圧Ｖ１として入力し、複数のＬＥＤ素子Ｚ１を直列接続したＬＥＤユニット３（ＬＥＤ光源）を出力に接続している。点灯装置１の出力電圧Ｖ３は、ＬＥＤユニット３の両端に印加され、ＬＥＤユニット３はＬＥＤ電流Ｉ１が流れて点灯する。なお、点灯装置１と、電源回路４、及びＬＥＤユニット３で、本発明のＬＥＤ照明装置を構成する。 FIG. 1 shows a lighting device 1 for an LED lighting device according to an embodiment of the present invention. As shown in FIG. 1, the lighting device 1 inputs a DC voltage output from a power supply circuit 4 as an input voltage V1, and connects an LED unit 3 (LED light source) in which a plurality of LED elements Z1 are connected in series to an output. doing. The output voltage V3 of the lighting device 1 is applied to both ends of the LED unit 3, and the LED unit 3 is turned on when the LED current I1 flows. The lighting device 1, the power supply circuit 4, and the LED unit 3 constitute the LED lighting device of the present invention.
点灯装置１は、図１に示すように、昇圧チョッパ回路１１と過電圧保護回路１２とで構成され、昇圧チョッパ回路１１の後段（下流の出力側）に過電圧保護回路１２が接続されている。 昇圧チョッパ回路１１は、入力電圧Ｖ１（第１の直流電圧）を昇圧電圧Ｖ２（第２の直流電圧）に昇圧する。過電圧保護回路１２は、何らかの不具合で昇圧チョッパ回路１１の出力がＬＥＤユニット３を点灯させるための所定の電圧（点灯電圧）を超えた場合でも、過電圧保護回路１２の出力電圧を昇圧チョッパ回路１１から本来出力されるべきＬＥＤユニット３を点灯させるために必要な所定の電圧に抑えるように設定されており、これにより、ＬＥＤユニット３が過電圧から保護される。 As illustrated in FIG. 1, the lighting device 1 includes a boost chopper circuit 11 and an overvoltage protection circuit 12, and the overvoltage protection circuit 12 is connected to the subsequent stage (downstream output side) of the boost chopper circuit 11. The boost chopper circuit 11 boosts the input voltage V1 (first DC voltage) to the boost voltage V2 (second DC voltage). Even when the output of the boost chopper circuit 11 exceeds a predetermined voltage (lighting voltage) for lighting the LED unit 3 due to some trouble, the overvoltage protection circuit 12 outputs the output voltage of the overvoltage protection circuit 12 from the boost chopper circuit 11. The LED unit 3 is set so as to be suppressed to a predetermined voltage necessary for lighting the LED unit 3 that should be output, and thus the LED unit 3 is protected from overvoltage.
図示しないが、一例として、昇圧チョッパ回路１１は、電源回路４の両端間に接続したインダクタとスイッチング素子との直列回路と、スイッチング素子に並列接続したダイオードとコンデンサとの直列回路とを備える。 Although not shown, the boost chopper circuit 11 includes, as an example, a series circuit of an inductor and a switching element connected between both ends of the power supply circuit 4, and a series circuit of a diode and a capacitor connected in parallel to the switching element.
昇圧チョッパ回路１１は、スイッチング素子がオンになると、電源回路４−インダクタ−スイッチング素子−電源回路４の経路で電流が流れ、インダクタに磁気エネルギーが蓄積される。そして、スイッチング素子がオフになると、インダクタに蓄積された磁気エネルギーが放出され、インダクタ−ダイオード−コンデンサ−電源回路４−インダクタの経路で電流が流れる。このスイッチング素子のオン・オフが繰り返されることによって、コンデンサの両端には、入力電圧Ｖ１より高い昇圧電圧が発生する。そして、コンデンサの両端の電圧が目標電圧Ｖ２となるようにスイッチング素子のオンデューティをＰＷＭ（Pulse Width Modulation）制御する。 In the step-up chopper circuit 11, when the switching element is turned on, a current flows through the path of the power supply circuit 4 -inductor-switching element-power supply circuit 4, and magnetic energy is accumulated in the inductor. When the switching element is turned off, the magnetic energy accumulated in the inductor is released, and a current flows through the path of inductor-diode-capacitor-power supply circuit 4-inductor. By repeatedly turning on and off the switching element, a boosted voltage higher than the input voltage V1 is generated at both ends of the capacitor. Then, the on-duty of the switching element is controlled by PWM (Pulse Width Modulation) so that the voltage across the capacitor becomes the target voltage V2.
図３は、本発明に係わる実施例の昇圧チョッパ回路１１の構成である。昇圧チョッパ回路１１は力率改善回路１１１を備えている。昇圧チョッパ回路１１のインダクタＬの電流が０になってからスイッチング素子であるＭＯＳＦＥＴをＯＮにする。このＭＯＳＦＥＴの電流波形は三角波である。力率改善回路１１１はＭＯＳＦＥＴのＯＮ幅を一定で動作させ、そのときの瞬時の入力電圧をＶＡＣとすると、三角波のピーク電流はｉp＝ＶＡＣ／Ｌとなり、入力電圧ＶＡＣは正弦波なのでｉpも正弦波となる。ＭＯＳＦＥＴの電流波形は三角波で、出力ダイオードＤoutの電流波形も三角波になるので、それらの電流の平均値ｉaveはｉave＝ｉp／２となり、入力電流平均値も入力電圧の正弦波に比例して正弦波になる。ピーク電流が低く抑えられるので損失が少なく効率の良い力率改善回路を実現している。 FIG. 3 shows the configuration of the step-up chopper circuit 11 according to the embodiment of the present invention. The step-up chopper circuit 11 includes a power factor correction circuit 111. After the current of the inductor L of the step-up chopper circuit 11 becomes 0, the MOSFET as a switching element is turned ON. The current waveform of this MOSFET is a triangular wave. The power factor correction circuit 111 operates with the MOSFET ON width being constant, and when the instantaneous input voltage at that time is VAC, the peak current of the triangular wave is ip = VAC / L, and the input voltage VAC is a sine wave, so that ip is also sine. Become a wave. Since the current waveform of the MOSFET is a triangular wave and the current waveform of the output diode Dout is also a triangular wave, the average value iave of these currents is iave = ip / 2, and the input current average value is also a sine proportional to the sine wave of the input voltage. Become a wave. Since the peak current can be kept low, an efficient power factor improvement circuit with low loss is realized.
本実施例の昇圧チョッパ回路１１は、１００Ｖ乃至２００Ｖの入力電圧が印加され、ＬＥＤユニット３の点灯電圧である４００Ｖの電圧を所定の電圧として出力する。過電圧保護回路１２が接続されていない場合、何らかの不具合で昇圧チョッパ回路１１の出力電圧が所定の電圧を超えた場合、ＬＥＤユニット３には点灯させるために必要な電圧（点灯電圧）を超える過電圧が印加され、ＬＥＤユニット３が破損してしまう虞がある。ＬＥＤユニット３を過電圧から保護するため、過電圧保護回路１２が昇圧チョッパ回路１１とＬＥＤユニット３との間に接続される。昇圧チョッパ回路１１は高電圧・低電流の電力を出力するため、過電圧保護回路１２は、一例としてツェナーダイオードを用いた構成となっている（不図示）。このツェナーダイオードは過電圧を所定の電圧に抑えることができるが、電流はあまり流せないという特性を有するため、昇圧チョッパ回路１１の出力に接続することで、突発的に昇圧チョッパ回路１１で発生した過電圧が過電圧保護回路１２のツェナーダイオードを通過すれば、ＬＥＤユニット３を点灯させるために必要な所定の電圧（点灯電圧）に抑えられるため、ＬＥＤユニット３を過電圧や過電流から保護することができる。 The step-up chopper circuit 11 of this embodiment is applied with an input voltage of 100 V to 200 V, and outputs a voltage of 400 V, which is a lighting voltage of the LED unit 3, as a predetermined voltage. When the overvoltage protection circuit 12 is not connected, when the output voltage of the boost chopper circuit 11 exceeds a predetermined voltage due to some trouble, the LED unit 3 has an overvoltage exceeding the voltage (lighting voltage) necessary for lighting. There is a possibility that the LED unit 3 may be damaged by being applied. In order to protect the LED unit 3 from overvoltage, an overvoltage protection circuit 12 is connected between the step-up chopper circuit 11 and the LED unit 3. Since the boost chopper circuit 11 outputs high voltage / low current power, the overvoltage protection circuit 12 has a configuration using a zener diode as an example (not shown). This Zener diode can suppress the overvoltage to a predetermined voltage, but has a characteristic that current cannot flow so much. Therefore, by connecting to the output of the boost chopper circuit 11, the overvoltage suddenly generated in the boost chopper circuit 11. If it passes through the Zener diode of the overvoltage protection circuit 12, the LED unit 3 can be suppressed to a predetermined voltage (lighting voltage) necessary for lighting the LED unit 3, so that the LED unit 3 can be protected from overvoltage and overcurrent.
従来のＬＥＤ駆動装置（点灯装置）Ａ１は、図２に示す通り、昇圧チョッパ回路Ａ１１と降圧チョッパ回路Ａ１２から構成されており、昇圧チョッパ回路Ａ１１の昇圧動作、降圧チョッパ回路Ａ１２の降圧動作の順に電力が生成される。何らかの不具合で昇圧チョッパ回路Ａ１１の出力Ｖ２がＬＥＤユニットＡ３を点灯させるために必要な点灯電圧を超えた場合、昇圧チョッパ回路Ａ１１の後段に接続されたと降圧チョッパ回路Ａ１２によって、所定の電圧Ｖ３（点灯電圧）に降圧されるためＬＥＤユニットＡ３には、ＬＥＤ素子Ｚ１を破壊するような高電圧の発生を防ぐことができる。しかし、降圧チョッパ回路Ａ１２は回路の特性上、出力電圧は入力電圧より低くするが、出力される電流は増加するため、上記の異常時には電圧は抑えられても電流によってＬＥＤユニットＡ３が破壊される虞がある。 As shown in FIG. 2, the conventional LED driving device (lighting device) A1 includes a step-up chopper circuit A11 and a step-down chopper circuit A12. The step-up operation of the step-up chopper circuit A11 and the step-down operation of the step-down chopper circuit A12 are performed in this order. Electric power is generated. If the output V2 of the step-up chopper circuit A11 exceeds a lighting voltage necessary for lighting the LED unit A3 due to some trouble, the step-down chopper circuit A12 connected to the subsequent stage of the step-up chopper circuit A11 causes a predetermined voltage V3 (lighting). Therefore, the LED unit A3 can be prevented from generating a high voltage that destroys the LED element Z1. However, although the output voltage of the step-down chopper circuit A12 is lower than the input voltage due to the circuit characteristics, the output current increases. Therefore, the LED unit A3 is destroyed by the current even if the voltage is suppressed in the case of the abnormality. There is a fear.
一方、本発明の過電圧保護回路１２は受動素子で構成されており駆動電力が不要である。しかし、従来例のＬＥＤ駆動装置Ａ１のＬＥＤユニット３を保護する働きのある降圧チョッパ回路Ａ１２は能動素子で構成されているため駆動電力が必要である。 On the other hand, the overvoltage protection circuit 12 of the present invention is composed of passive elements and does not require driving power. However, since the step-down chopper circuit A12 that functions to protect the LED unit 3 of the conventional LED driving device A1 is composed of active elements, driving power is required.
以上述べた通り、本発明のＬＥＤ照明装置用の点灯装置１は昇圧チョッパ回路１１だけが駆動電力が必要で、過電圧保護回路１２は駆動電圧は不要なため、従来ＬＥＤユニット保護のため駆動する降圧チョッパ回路Ａ１２を不要とし、該降圧チョッパ回路Ａ１２で消費されていた電力を不要とするため、点灯装置１で消費される電力が少なくて済む。したがって、ＬＥＤ照明装置の消費電力を少なく抑えることができる。 As described above, in the lighting device 1 for an LED lighting device according to the present invention, only the step-up chopper circuit 11 requires driving power, and the overvoltage protection circuit 12 does not require a driving voltage. Since the chopper circuit A12 is not required and the power consumed by the step-down chopper circuit A12 is not required, the power consumed by the lighting device 1 can be reduced. Therefore, the power consumption of the LED lighting device can be reduced.
１ ・・・点灯装置
３ ・・・ＬＥＤユニット
４ ・・・電源回路
１１ ・・・昇圧チョッパ回路
１２ ・・・過電圧保護回路
１１１・・・力率改善回路
Ｚ１ ・・・ＬＥＤ素子
DESCRIPTION OF SYMBOLS 1 ... Lighting device 3 ... LED unit 4 ... Power supply circuit 11 ... Boost chopper circuit 12 ... Overvoltage protection circuit 111 ... Power factor improvement circuit Z1 ... LED element
Claims (5)
前記点灯装置の点灯回路は、昇圧チョッパ回路と、
前記昇圧チョッパ回路に接続される過電圧保護回路と、
を備えることを特徴とするＬＥＤ照明装置の点灯装置。 A lighting device for an LED lighting device that supplies direct current power to an LED unit,
The lighting circuit of the lighting device includes a boost chopper circuit,
An overvoltage protection circuit connected to the boost chopper circuit;
A lighting device for an LED lighting device.
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| JP2003212171A (en) * | 2002-01-24 | 2003-07-30 | Tsugunori Toyoda | Lighting device for bicycle |
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