JP2012178292A - Led lighting circuit - Google Patents
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- JP2012178292A JP2012178292A JP2011041203A JP2011041203A JP2012178292A JP 2012178292 A JP2012178292 A JP 2012178292A JP 2011041203 A JP2011041203 A JP 2011041203A JP 2011041203 A JP2011041203 A JP 2011041203A JP 2012178292 A JP2012178292 A JP 2012178292A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本発明は、照明器具、照明装置関連技術分野における省エネルギー型で、比較的大きな動作電流を持つＬＥＤ（発光ダイオード）の点灯回路に関する。 The present invention relates to an LED (light emitting diode) lighting circuit that is energy-saving and has a relatively large operating current in the technical field related to lighting fixtures and lighting devices.
ＬＥＤ点灯回路の従来技術としては、例えば特開平１１−９７７４７号公報（特許文献１）、特開２０００−３０６６８５号公報（特許文献２）、特開２００３―３３２６２５号公報（特許文献３）に開示された先行例が知られている。 As prior art of the LED lighting circuit, for example, disclosed in Japanese Patent Application Laid-Open No. 11-97747 (Patent Document 1), Japanese Patent Application Laid-Open No. 2000-306685 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2003-332625 (Patent Document 3). Prior examples are known.
特許文献１に開示された先行例は、電流制限用リアクタンスとしてコンデンサを利用しているため、電源投入時に突入電流が発生する。この突入電流からＬＥＤを保護する目的で直列に抵抗器を接続するのが一般的であるが、これによるエネルギー損失が起きる。特許文献２に開示された先行例も同様であり、電流制限用リアクタンスに対して直列に抵抗器が接続されている。この抵抗器によるエネルギー損失が発生するため、動作電流の小さいＬＥＤの点灯には有効であるが、比較的大きな動作電流のＬＥＤを点灯すると、直列に接続された抵抗の損失が大きくなり、省エネルギー化は難しくなる。 Since the prior example disclosed in Patent Document 1 uses a capacitor as the current limiting reactance, an inrush current is generated when the power is turned on. Generally, a resistor is connected in series for the purpose of protecting the LED from the inrush current, but this causes energy loss. The preceding example disclosed in Patent Document 2 is the same, and a resistor is connected in series with the current limiting reactance. This resistor causes energy loss, so it is effective for lighting an LED with a small operating current. However, when a LED with a relatively large operating current is lit, the loss of the resistor connected in series increases, saving energy. Becomes difficult.
他方、特許文献３に開示された先行例は、抵抗器を省いて電流制限用コンデンサのみとしたものであり、コンデンサの損失は実質ゼロに近く、最高の効率となるが、電源投入時に発生する突入電流でＬＥＤが破壊されるおそれがあるため実用的とは言い難い。 On the other hand, the prior art disclosed in Patent Document 3 is one in which a resistor is omitted and only a current limiting capacitor is provided, and the loss of the capacitor is substantially zero and has the highest efficiency, but occurs when the power is turned on. Since the LED may be destroyed by the inrush current, it is difficult to say that it is practical.
そこで本発明は、点灯時の突入電流からのＬＥＤ保護と低消費電力化を両立し、比較的動作電流の大きいＬＥＤの点灯も可能とするＬＥＤ点灯回路を提供することを目的とする。 Therefore, an object of the present invention is to provide an LED lighting circuit that achieves both LED protection from inrush current during lighting and low power consumption, and can also light an LED having a relatively large operating current.
上記した課題を解決するために、本発明に係る一態様のＬＥＤ点灯回路は、電源から供給される電力を利用してＬＥＤを点灯させるＬＥＤ点灯回路であって、（ａ）前記電源の一端と前記ＬＥＤの一端との間に接続された容量性リアクタンス素子と、（ｂ）第一制御端と一対の第一入出力端を有し、前記電源の他端と前記ＬＥＤの他端との間に前記一対の第一入出力端を直列に接続されており、前記第一制御端へ電圧が印加されたときに前記一対の第一入出力端が導通する第一スイッチング素子と、（ｃ）前記ＬＥＤの一端と前記第一スイッチング素子の前記第一制御端との間に接続された抵抗器と、（ｄ）前記第一スイッチング素子の前記第一制御端と前記電源の他端との間に接続されたコンデンサと、（ｅ）第二制御端と一対の第二入出力端を有し、前記一対の第二入出力端を前記コンデンサに対して並列に接続され、前記第二制御端を前記抵抗器と前記コンデンサの間の節点に接続されており、前記第二制御端へ印加される電圧が実質的にゼロであるときに前記一対の第二入出力端が導通する第二スイッチング素子を備えることを特徴とする。 In order to solve the above-described problem, an LED lighting circuit according to one aspect of the present invention is an LED lighting circuit that lights an LED using power supplied from a power source, and (a) one end of the power source and A capacitive reactance element connected between one end of the LED; and (b) a first control end and a pair of first input / output ends, between the other end of the power source and the other end of the LED. A pair of first input / output terminals connected in series, and a first switching element in which the pair of first input / output terminals conduct when a voltage is applied to the first control terminal; and (c) A resistor connected between one end of the LED and the first control end of the first switching element; and (d) between the first control end of the first switching element and the other end of the power source. A capacitor connected to (e) a second control end and a pair of second input / output A pair of second input / output terminals connected in parallel to the capacitor, the second control terminal is connected to a node between the resistor and the capacitor, and the second control A second switching element is provided in which the pair of second input / output terminals are turned on when a voltage applied to the terminals is substantially zero.
上記のＬＥＤ点灯回路では、電源投入時には、コンデンサの働きにより第一スイッチング素子の第一制御端の急激な電圧上昇が抑えられる。それにより、容量性リアクタンス素子に印加させる電圧を徐々に減少させることができるので、突入電流が流れることを回避できる。また、電源が切断された時には、第二スイッチング素子が導通状態となることにより、コンデンサに充電された電荷を急速に放電させることができる。それにより、電源のオンオフが短時間に繰り返された場合や電源に瞬断が生じた場合などにおける突入電流の発生を防ぐことができる。以上のことから、上記のＬＥＤ点灯回路では突入電流防止目的の直列抵抗器を用いずとも点灯時の突入電流からのＬＥＤ保護が実現される。そして、直列抵抗器が省かれることにより低消費電力化を達成できる。さらに、上記のＬＥＤ点灯回路によれば動作電流の大きなＬＥＤの駆動も可能となる。 In the LED lighting circuit described above, when the power is turned on, a sudden voltage increase at the first control terminal of the first switching element is suppressed by the action of the capacitor. As a result, the voltage applied to the capacitive reactance element can be gradually reduced, so that inrush current can be avoided. In addition, when the power supply is cut off, the second switching element becomes conductive, so that the charge charged in the capacitor can be discharged rapidly. Thereby, it is possible to prevent the occurrence of an inrush current when the power supply is repeatedly turned on and off in a short time or when the power supply is momentarily interrupted. From the above, in the above LED lighting circuit, LED protection from inrush current during lighting can be realized without using a series resistor for preventing inrush current. Further, the power consumption can be reduced by omitting the series resistor. Furthermore, according to the LED lighting circuit described above, it is possible to drive an LED having a large operating current.
本発明によれば、点灯時の突入電流からのＬＥＤ保護と低消費電力化を両立し、極めて高い効率のＬＥＤ点灯回路が実現できるため、使用電力を大幅に低減することが可能になり、温室効果ガスＣＯ２削減に寄与できることはもとより、動作電流の大きいＬＥＤを効率良く点灯する回路へ応用することも可能となる。 According to the present invention, both LED protection from inrush current during lighting and low power consumption can be realized, and an extremely high efficiency LED lighting circuit can be realized. In addition to being able to contribute to the reduction of the effect gas CO 2 , it is also possible to apply it to a circuit for efficiently lighting an LED having a large operating current.
本発明の実施の形態について図面を参照して説明する。 Embodiments of the present invention will be described with reference to the drawings.
図１は、本発明を適用した一実施形態のＬＥＤ点灯回路の回路図である。図１に示す本実施形態のＬＥＤ点灯回路は、交流電源（又は商用電源）１から電力供給を受けてＬＥＤ１９を点灯させるためのものであり、主要な構成要素として容量性リアクタンス素子４およびスイッチ回路２１を含んで構成されている。 FIG. 1 is a circuit diagram of an LED lighting circuit according to an embodiment to which the present invention is applied. The LED lighting circuit of this embodiment shown in FIG. 1 is for receiving power supply from an AC power supply (or commercial power supply) 1 to light up the LED 19, and has a capacitive reactance element 4 and a switch circuit as main components. 21 is comprised.
容量性リアクタンス素子４は、一端がヒューズ２を介して電源１と接続され、他端がダイオードブリッジ６、インダクタンス素子７およびスイッチ回路２１を介してＬＥＤ１９の接続されている。この容量性リアクタンス素子４は、定常状態におけるＬＥＤ１９に流れる電流値を決めるための電流制限素子であり、具体的には低損失のコンデンサである。 One end of the capacitive reactance element 4 is connected to the power source 1 via the fuse 2, and the other end is connected to the LED 19 via the diode bridge 6, the inductance element 7, and the switch circuit 21. The capacitive reactance element 4 is a current limiting element for determining a current value flowing through the LED 19 in a steady state, and is specifically a low-loss capacitor.
スイッチ回路２１は、交流電源１とＬＥＤ１９の間に接続されている。このスイッチ回路２１は、抵抗器１１、１３、コンデンサ１４、１６、ツェナーダイオード１２、１７、ジャンクション型ＦＥＴ１５、パワーＭＯＳＦＥＴ１８を有して構成されている。 The switch circuit 21 is connected between the AC power supply 1 and the LED 19. The switch circuit 21 includes resistors 11 and 13, capacitors 14 and 16, Zener diodes 12 and 17, a junction type FET 15, and a power MOSFET 18.
抵抗器１１は、一端がＬＥＤ１９の一端と接続され、他端がツェナーダイオード１２、抵抗器１３およびコンデンサ１４からなる並列回路と接続されている。ツェナーダイオード１２等からなる並列回路は、図示のように一端が抵抗器１１と接続され、他端がコンデンサ１６と接続されている。コンデンサ１６は、一端がパワーＭＯＳＦＥＴ１８のソース電極と接続され、他端がパワーＭＯＳＦＥＴ１８のゲート電極と接続されている。ツェナーダイオード１７は、コンデンサ１６と並列に接続されている。図示のように、コンデンサ１６の他端とともにツェナーダイオード１７の一端はパワーＭＯＳＦＥＴ１８のゲート電極と接続されている。 One end of the resistor 11 is connected to one end of the LED 19, and the other end is connected to a parallel circuit including the Zener diode 12, the resistor 13, and the capacitor 14. As shown in the figure, the parallel circuit including the Zener diode 12 and the like has one end connected to the resistor 11 and the other end connected to the capacitor 16. The capacitor 16 has one end connected to the source electrode of the power MOSFET 18 and the other end connected to the gate electrode of the power MOSFET 18. Zener diode 17 is connected in parallel with capacitor 16. As shown, one end of the Zener diode 17 together with the other end of the capacitor 16 is connected to the gate electrode of the power MOSFET 18.
ジャンクション型ＦＥＴ１５は、抵抗器１１とツェナーダイオード１２等の並列回路との間の節点にゲート電極が接続され、ツェナーダイオード１２等の並列回路とコンデンサ１６との間の節点にソース電極が接続され、コンデンサ１６およびツェナーダイオード１７の他端にドレイン電極が接続されている。 The junction type FET 15 has a gate electrode connected to a node between the resistor 11 and a parallel circuit such as a Zener diode 12, and a source electrode connected to a node between the parallel circuit such as the Zener diode 12 and the capacitor 16. A drain electrode is connected to the other ends of the capacitor 16 and the Zener diode 17.
パワーＭＯＳＦＥＴ１８は、コンデンサ１６とツェナーダイオード１７の各一端にゲート電極が接続され、コンデンサ１６およびツェナーダイオード１７の他端にソース電極が接続され、ＬＥＤ１９の他端にドレイン電極が接続されている。 The power MOSFET 18 has a gate electrode connected to one end of each of the capacitor 16 and the Zener diode 17, a source electrode connected to the other end of the capacitor 16 and the Zener diode 17, and a drain electrode connected to the other end of the LED 19.
ここで、ＬＥＤ点灯回路に含まれる他の回路要素についても説明する。ヒューズ２は、ＬＥＤ点灯回路に不具合が発生した場合に流れる過大電流に備え、安全目的に使用されるものである。このヒューズ２は、電流動作型ヒューズに限らず温度動作型ヒューズを用いてもよい。バリスタ３は、交流電源１と並列にして一端がヒューズ２に接続され、他端が電源スイッチ２２と接続されており、ＬＥＤ点灯回路を過電圧から保護する。抵抗器５は、容量性リアクタンス素子４に充電された電荷を放電させるためのものであり、電撃防止を目的に容量性リアクタンス素子４と並列に接続されている。 Here, other circuit elements included in the LED lighting circuit will also be described. The fuse 2 is used for safety purposes in preparation for an excessive current that flows when a failure occurs in the LED lighting circuit. The fuse 2 is not limited to a current operation type fuse, and a temperature operation type fuse may be used. The varistor 3 has one end connected to the fuse 2 in parallel with the AC power source 1 and the other end connected to the power switch 22 to protect the LED lighting circuit from overvoltage. The resistor 5 is for discharging the electric charge charged in the capacitive reactance element 4, and is connected in parallel with the capacitive reactance element 4 for the purpose of preventing electric shock.
ブリッジダイオード６は、電源１から供給される交流電力を全波整流して直流電力に変換する。インダクタンス素子７は、ＬＥＤ１９の一端とブリッジダイオード６との間に接続されている。インダクタンス素子９は、ＬＥＤ１９の他端とブリッジダイオード６との間に接続されている。これらのインダクタンス素子７、９は、外来ノイズ防止を目的に使用されている。ダイオード８は、インダクタンス素子７と並列に接続されている。同様にダイオード１０は、インダクタンス素子９と並列に接続されている。これらのダイオード８、１０は、電源オフ時の過電圧発生防止用である。バリスタ２０は、ＬＥＤ１９を保護する目的でＬＥＤ１９と並列に接続されている。 The bridge diode 6 performs full-wave rectification on the AC power supplied from the power supply 1 and converts it into DC power. The inductance element 7 is connected between one end of the LED 19 and the bridge diode 6. The inductance element 9 is connected between the other end of the LED 19 and the bridge diode 6. These inductance elements 7 and 9 are used for the purpose of preventing external noise. The diode 8 is connected in parallel with the inductance element 7. Similarly, the diode 10 is connected in parallel with the inductance element 9. These diodes 8 and 10 are for preventing overvoltage generation when the power is off. The varistor 20 is connected in parallel with the LED 19 for the purpose of protecting the LED 19.
次に、本実施形態のＬＥＤ点灯回路の動作について詳細に説明する。 Next, the operation of the LED lighting circuit of this embodiment will be described in detail.
まず、電源投入時における動作は次のようになる。電源スイッチ２２がオン（閉状態）となると交流電源１から電力が供給される。このとき、パワーＭＯＳＦＥＴ１８のゲート電極とソース電極間に接続されたコンデンサ１６が急激なゲート電極の電圧上昇を抑え、徐々に増加させる。このため、容量性リアクタンス素子４を通して突入電流が流れることはない。以後、この動作を「スロースタート動作」と呼ぶ。 First, the operation when the power is turned on is as follows. When the power switch 22 is turned on (closed state), power is supplied from the AC power source 1. At this time, the capacitor 16 connected between the gate electrode and the source electrode of the power MOSFET 18 suppresses a rapid voltage increase of the gate electrode and gradually increases the voltage. For this reason, no inrush current flows through the capacitive reactance element 4. Hereinafter, this operation is referred to as “slow start operation”.
ゲート電極の電圧上昇の速度は、抵抗器１１の値、ツェナーダイオード１２の電圧、コンデンサ１６の値を適宜に設定することで調整することができる。パワーＭＯＳＦＥＴ１８のドレイン電極、ソース電極間の等価抵抗値は、ゲート電極とソース電極間の電圧の上昇に従って遮断時の高い値から飽和抵抗値ＲＤＳ（ＯＮ）に向かって低くなる。このため、容量性リアクタンス素子４に印加される電圧も徐々に減少し、突入電流を流すことなく定常電流値に到達させることができる。 The speed of voltage increase of the gate electrode can be adjusted by appropriately setting the value of the resistor 11, the voltage of the Zener diode 12, and the value of the capacitor 16. The equivalent resistance value between the drain electrode and the source electrode of the power MOSFET 18 decreases from a high value at the time of cutoff to a saturation resistance value RDS (ON) as the voltage between the gate electrode and the source electrode increases. For this reason, the voltage applied to the capacitive reactance element 4 also gradually decreases, and it is possible to reach a steady current value without flowing an inrush current.
ところで、電源スイッチ２１の短時間のオンオフの繰り返し又は瞬断などに対しては、スロースタート動作が働かず、ＬＥＤ１９が破損するおそれがある。このため、電源スイッチ２２がオフ（開状態）となり、交流電源１の電圧の印加が無くなったときに、コンデンサ１６の電荷を放電させ、ＬＥＤ１９に流れる電流を急速に遮断させる必要がある。以後、この動作を「ファーストストップ動作」と呼ぶ。ジャンクション型ＦＥＴ１５はこのファーストストップ動作を実現するために用いられる。以下にその動作を説明する。 By the way, when the power switch 21 is repeatedly turned on and off for a short time or momentary interruption, the slow start operation does not work, and the LED 19 may be damaged. For this reason, when the power switch 22 is turned off (opened) and the voltage of the AC power supply 1 is no longer applied, it is necessary to discharge the charge of the capacitor 16 and to quickly cut off the current flowing through the LED 19. Hereinafter, this operation is referred to as “first stop operation”. The junction type FET 15 is used to realize this first stop operation. The operation will be described below.
ＬＥＤ１９に定常電流が流れている状態においては、パワーＭＯＳＦＥＴ１８のゲート電極には、抵抗器１１と、抵抗器１３、コンデンサ１４並びにツェナーダイオード１２の並列回路を介してバイアス電圧が供給され、コンデンサ１６はツェナーダイオード１７の電圧まで充電されている。コンデンサ１４の値と抵抗器１３の値については、ＬＥＤ１９に定常電流が流れている間はジャンクション型ＦＥＴ１５がオンにならないように選ぶ必要がある。ツェナーダイオード１７の電圧は、パワーＭＯＳＦＥＴ１８が十分オンになる値とする。 In a state where a steady current flows through the LED 19, a bias voltage is supplied to the gate electrode of the power MOSFET 18 through a parallel circuit of the resistor 11, the resistor 13, the capacitor 14, and the Zener diode 12. The battery is charged up to the voltage of the Zener diode 17. The value of the capacitor 14 and the value of the resistor 13 must be selected so that the junction FET 15 does not turn on while the steady current is flowing through the LED 19. The voltage of the Zener diode 17 is set to a value that sufficiently turns on the power MOSFET 18.
このとき、ジャンクション型ＦＥＴ１５のゲート電極とソース電極間には、ツェナーダイオード１２の電圧が逆方向に印加されているため、ジャンクションＦＥＴ１５はオフの状態を保っている。なお、ツェナーダイオード１２は、ジャンクション型ＦＥＴ１５のカットオフ電圧より少し高い電圧のものを用いる。 At this time, since the voltage of the Zener diode 12 is applied in the reverse direction between the gate electrode and the source electrode of the junction FET 15, the junction FET 15 is kept off. The Zener diode 12 has a voltage slightly higher than the cut-off voltage of the junction FET 15.
電源スイッチ２２がオフになると、抵抗器１１を流れる電流が瞬時にゼロとなり、続いてジャンクション型ＦＥＴ１５のゲート電極とソース電極間の電圧がゼロとなり、ジャンクション型ＦＥＴが導通状態となる。それにより、コンデンサ１６の電荷を急速に放電させ、パワーＭＯＳＦＥＴ１８を遮断状態とすることができる。 When the power switch 22 is turned off, the current flowing through the resistor 11 instantaneously becomes zero, and then the voltage between the gate electrode and the source electrode of the junction type FET 15 becomes zero, and the junction type FET becomes conductive. Thereby, the electric charge of the capacitor 16 can be rapidly discharged, and the power MOSFET 18 can be cut off.
このように、スロースタート動作とファーストストップ動作を実現可能なスイッチ回路２１を利用することにより、突入電流を防止するために従来用いていた抵抗器を省くことが可能となる。それにより、極めて効率が高く、大きな動作電流のＬＥＤの駆動に対応できるＬＥＤ点灯回路を実現できる。また、サイリスタ、トライアックなどの位相制御素子や高周波のインバータを用いないため、ノイズの発生の少ないＬＥＤ点灯回路を実現できる。 As described above, by using the switch circuit 21 that can realize the slow start operation and the fast stop operation, it is possible to omit the resistor conventionally used for preventing the inrush current. Thereby, it is possible to realize an LED lighting circuit that is extremely efficient and can handle driving of an LED with a large operating current. In addition, since a phase control element such as a thyristor or triac or a high-frequency inverter is not used, an LED lighting circuit with less noise can be realized.
図２は、本発明の一実施例で、ＬＥＤ（動作電流５００ｍＡ）を５個使用した場合のＬＥＤ点灯回路の電源電圧と消費電力の関係を示すグラフである。図２に示すように、例えば電源電圧が１００Ｖにおける消費電力は７．５Ｗであり、非常に低消費電力であることが分かる。この実施例のＬＥＤ点灯回路とそれにより駆動されているＬＥＤの外観写真を図３に示す。また、この実施例における電源投入時と電源オフ時の波形図を図４に示す。図４（ａ）は電源投入時の波形図、図４（ｂ）は電源オフ時の波形図であり、それぞれ電源電圧の波形が図中の上段に示され、ＬＥＤに流れる電流の波形が下段に示されている。図４（ａ）に示すように、電源投入時には電源電圧の上昇から約３００ミリ秒経過した後にＬＥＤに電流が流れ始めている、すなわちスロースタート動作が実現されることが分かる。また、図４（ｂ）に示すように、電源オフ時には電源電圧の低下に対応してＬＥＤへの電流がすぐにゼロとなっている、すなわちファーストストップ動作が実現されていることが分かる。 FIG. 2 is a graph showing the relationship between the power supply voltage of the LED lighting circuit and the power consumption when five LEDs (operating current 500 mA) are used in one embodiment of the present invention. As shown in FIG. 2, for example, the power consumption when the power supply voltage is 100 V is 7.5 W, which indicates that the power consumption is very low. An appearance photograph of the LED lighting circuit of this embodiment and the LED driven thereby is shown in FIG. FIG. 4 shows waveform diagrams when the power is turned on and when the power is turned off in this embodiment. 4A is a waveform diagram when the power is turned on, and FIG. 4B is a waveform diagram when the power is turned off. The waveform of the power supply voltage is shown in the upper part of the figure, and the waveform of the current flowing through the LED is the lower part. Is shown in As shown in FIG. 4A, when the power is turned on, it can be seen that a current starts to flow through the LED after about 300 milliseconds from the rise of the power supply voltage, that is, a slow start operation is realized. Further, as shown in FIG. 4B, it can be seen that when the power is turned off, the current to the LED immediately becomes zero corresponding to the decrease in the power supply voltage, that is, the first stop operation is realized.
なお、本発明は上記した内容に限定されず、本発明の要旨の範囲内において種々に変形して実施することができる。例えば、上記したＬＥＤ点灯回路におけるスイッチング素子としてのパワーＭＯＳＦＥＴは、バイポーラトランジスタに置き換えてもよい。また、上記したＬＥＤ点灯回路におけるジャンクション型ＦＥＴは、常閉接点（ｂ接点）を有する機械的リレー又は電子的リレーなどに置き換えてもよい。 The present invention is not limited to the above-described contents, and various modifications can be made within the scope of the gist of the present invention. For example, the power MOSFET as a switching element in the LED lighting circuit described above may be replaced with a bipolar transistor. The junction FET in the LED lighting circuit described above may be replaced with a mechanical relay or an electronic relay having a normally closed contact (b contact).
本発明は、比較的動作電流の大きいＬＥＤの点灯回路への応用に特に適しているため、家庭用照明器具にとどまらず、公共施設、オフィス、工場などあらゆる分野で利用できるものである。併せて、極めて効率が高いので、エネルギー削減効果が期待される。 Since the present invention is particularly suitable for application to a lighting circuit of an LED having a relatively large operating current, it can be used not only for home lighting equipment but also in various fields such as public facilities, offices and factories. At the same time, the efficiency is extremely high, so an energy reduction effect is expected.
１ 交流電源
２ ヒューズ
３ バリスタ
４ 容量性リアクタンス素子（低損失コンデンサ）
５ 放電用抵抗器
６ ダイオードブリッジ
７ インダクタンス
８ ダイオード
９ インダクタンス
１０ ダイオード
１１ 抵抗器
１２ ツェナーダイオード
１３ 抵抗器
１４ コンデンサ
１５ ジャンクション型ＦＥＴ
１６ コンデンサ
１７ ツェナーダイオード
１８ パワーＭＯＳＦＥＴ
１９ ＬＥＤ
２０ バリスタ
２１ スイッチ回路
２２ 電源スイッチ
1 AC power supply 2 Fuse 3 Varistor 4 Capacitive reactance element (low loss capacitor)
DESCRIPTION OF SYMBOLS 5 Discharge resistor 6 Diode bridge 7 Inductance 8 Diode 9 Inductance 10 Diode 11 Resistor 12 Zener diode 13 Resistor 14 Capacitor 15 Junction type FET
16 Capacitor 17 Zener diode 18 Power MOSFET
19 LED
20 Varistor 21 Switch circuit 22 Power switch
Claims (4)
前記電源の一端と前記ＬＥＤの一端との間に接続された容量性リアクタンス素子と、
第一制御端と一対の第一入出力端を有し、前記電源の他端と前記ＬＥＤの他端との間に前記一対の第一入出力端を直列に接続されており、前記第一制御端へ電圧が印加されたときに前記一対の第一入出力端が導通する第一スイッチング素子と、
前記ＬＥＤの一端と前記第一スイッチング素子の前記第一制御端との間に接続された抵抗器と、
前記第一スイッチング素子の前記第一制御端と前記電源の他端との間に接続されたコンデンサと、
第二制御端と一対の第二入出力端を有し、前記一対の第二入出力端を前記コンデンサに対して並列に接続され、前記第二制御端を前記抵抗器と前記コンデンサの間の節点に接続されており、前記第二制御端へ印加される電圧が実質的にゼロであるときに前記一対の第二入出力端が導通する第二スイッチング素子、
を備えることを特徴とするＬＥＤ点灯回路。 An LED lighting circuit for lighting an LED using power supplied from a power source,
A capacitive reactance element connected between one end of the power source and one end of the LED;
A first control end and a pair of first input / output ends; the pair of first input / output ends connected in series between the other end of the power source and the other end of the LED; A first switching element in which the pair of first input / output terminals are conducted when a voltage is applied to the control terminals;
A resistor connected between one end of the LED and the first control end of the first switching element;
A capacitor connected between the first control end of the first switching element and the other end of the power source;
A second control terminal and a pair of second input / output terminals; the pair of second input / output terminals are connected in parallel to the capacitor; and the second control terminal is connected between the resistor and the capacitor. A second switching element connected to the node, wherein the pair of second input / output terminals conduct when the voltage applied to the second control terminal is substantially zero;
An LED lighting circuit comprising:
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| JP2016126825A (en) * | 2014-12-26 | 2016-07-11 | ニチコン株式会社 | Switching power supply circuit |
| JP2017103156A (en) * | 2015-12-03 | 2017-06-08 | 和光電研株式会社 | Protective device for power supply unit and circuit device |
| JP2019040764A (en) * | 2017-08-25 | 2019-03-14 | ルナライト株式会社 | Lighting circuit and signal device |
| US10361536B2 (en) | 2015-04-15 | 2019-07-23 | Mitsubishi Electric Corporation | Power supply apparatus for driving laser diode provided with power supply for supplying power to laser oscillator |
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| JP2007059247A (en) * | 2005-08-25 | 2007-03-08 | Toshiba Lighting & Technology Corp | Led lighting device |
| JP2007126041A (en) * | 2005-11-04 | 2007-05-24 | Koito Mfg Co Ltd | Lighting controller for lighting fixture for vehicle |
| JP2009182266A (en) * | 2008-01-31 | 2009-08-13 | Idec Corp | Electric circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007059247A (en) * | 2005-08-25 | 2007-03-08 | Toshiba Lighting & Technology Corp | Led lighting device |
| JP2007126041A (en) * | 2005-11-04 | 2007-05-24 | Koito Mfg Co Ltd | Lighting controller for lighting fixture for vehicle |
| JP2009182266A (en) * | 2008-01-31 | 2009-08-13 | Idec Corp | Electric circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016126825A (en) * | 2014-12-26 | 2016-07-11 | ニチコン株式会社 | Switching power supply circuit |
| US10361536B2 (en) | 2015-04-15 | 2019-07-23 | Mitsubishi Electric Corporation | Power supply apparatus for driving laser diode provided with power supply for supplying power to laser oscillator |
| JP2017103156A (en) * | 2015-12-03 | 2017-06-08 | 和光電研株式会社 | Protective device for power supply unit and circuit device |
| JP2019040764A (en) * | 2017-08-25 | 2019-03-14 | ルナライト株式会社 | Lighting circuit and signal device |
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