JP2010244958A - Control circuit for light emitting device - Google Patents

Control circuit for light emitting device Download PDF

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Publication number
JP2010244958A
JP2010244958A JP2009094707A JP2009094707A JP2010244958A JP 2010244958 A JP2010244958 A JP 2010244958A JP 2009094707 A JP2009094707 A JP 2009094707A JP 2009094707 A JP2009094707 A JP 2009094707A JP 2010244958 A JP2010244958 A JP 2010244958A
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voltage
led
light emitting
switching element
control circuit
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Yoshio Fujimura
芳夫 藤村
Yusuke Nishizaki
祐介 西崎
Satoru Yoshioka
悟 吉岡
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Sanyo Electric Co Ltd
System Solutions Co Ltd
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Sanyo Electric Co Ltd
Sanyo Semiconductor Co Ltd
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Priority to JP2009094707A priority Critical patent/JP2010244958A/en
Priority to TW099105585A priority patent/TW201038129A/en
Priority to CN2010101498980A priority patent/CN101861009B/en
Priority to US12/757,197 priority patent/US8330380B2/en
Publication of JP2010244958A publication Critical patent/JP2010244958A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a control circuit for a light emitting device, capable of controlling light of the light emitting device such as an LED using a conventional light control system. <P>SOLUTION: This control circuit includes a rectifier unit 30 to apply full-wave rectification to an ac power supply, a smoothing capacitor 32 to smooth a voltage rectified in the rectifier unit 30, a switching element 38 to switch a current flowing in an LED 102 emitting light by receiving the smoothed voltage, a voltage dividing circuit 44 to obtain a reference voltage Vref by diving the smoothed voltage, a comparator 42 to compare a comparison voltage Vcm corresponding to the current flowing in the LED 102 with the reference voltage Vref, and a control unit 40 to control switching of the switching element 38 in accordance with a comparison result by the comparator 42. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、発光素子の制御を行う制御回路に関する。   The present invention relates to a control circuit that controls a light emitting element.

発光ダイオード（ＬＥＤ）を照明用の発光素子として利用する照明システムが開発されている。   An illumination system using a light emitting diode (LED) as a light emitting element for illumination has been developed.

図３は、従来の照明システムの制御回路１００を示す。制御回路１００は、整流部１０、整流用コンデンサ１２、チョークコイル１４、回生用ダイオード１６、スイッチング素子１８、制御部２０及び比較器２２を含んで構成される。   FIG. 3 shows a control circuit 100 of a conventional lighting system. The control circuit 100 includes a rectifying unit 10, a rectifying capacitor 12, a choke coil 14, a regenerative diode 16, a switching element 18, a control unit 20, and a comparator 22.

整流部１０にＡＣ電源を供給すると、ＡＣ電源が全波整流される。全波整流された電圧は整流用コンデンサ１２によって平滑化され、制御部２０の電源電圧及びＬＥＤ１０２のアノード端子へ駆動電圧として供給される。ＬＥＤ１０２のカソードは、チョークコイル１４、スイッチング素子１８及び抵抗素子Ｒ１の直列接続を介して接地される。制御部２０によりスイッチング素子１８をスイッチング制御することによって、チョークコイル１４、スイッチング素子１８及び抵抗素子Ｒ１を介してＬＥＤ１０２へ電流し、ＬＥＤ１０２を発光させる。また、スイッチング素子１８がオフになった際に、チョークコイル１４に蓄えられているエネルギーをＬＥＤ１０２へ回生させる回生用ダイオード１６がＬＥＤ１０２及びチョークコイル１４に並列に設けられる。   When AC power is supplied to the rectifier 10, the AC power is full-wave rectified. The full-wave rectified voltage is smoothed by the rectifying capacitor 12 and supplied as a drive voltage to the power supply voltage of the control unit 20 and the anode terminal of the LED 102. The cathode of the LED 102 is grounded via a series connection of the choke coil 14, the switching element 18, and the resistance element R1. By performing switching control of the switching element 18 by the control unit 20, current is supplied to the LED 102 via the choke coil 14, the switching element 18, and the resistance element R <b> 1, thereby causing the LED 102 to emit light. Further, when the switching element 18 is turned off, a regenerative diode 16 that regenerates energy stored in the choke coil 14 to the LED 102 is provided in parallel with the LED 102 and the choke coil 14.

比較器２２には、ＬＥＤ１０２を流れる電流によって抵抗素子Ｒ１の両端に発生する比較電圧Ｖｃｍｐと、平滑化された電源を受けた制御部２０で発生させた電圧Ｖｒｅｇを抵抗分割した一定の基準電圧Ｖｒｅｆと、が入力される。制御部２０は、比較器２２による基準電圧Ｖｒｅｆと比較電圧Ｖｃｍｐとの比較結果に基づいてスイッチング素子１８のスイッチングを制御する。制御部２０は、比較電圧Ｖｃｍｐが基準電圧Ｖｒｅｆより小さい場合にはスイッチング素子１８をオンにしてＬＥＤ１０２へ電流を流し、比較電圧Ｖｃｍｐが基準電圧Ｖｒｅｆより大きくなった場合にはスイッチング素子１８をオフにしてＬＥＤ１０２への電流を遮断する。   The comparator 22 has a constant reference voltage Vref obtained by resistance-dividing the comparison voltage Vcmp generated at both ends of the resistance element R1 by the current flowing through the LED 102 and the voltage Vreg generated by the control unit 20 receiving the smoothed power source. And are input. The control unit 20 controls switching of the switching element 18 based on the comparison result between the reference voltage Vref and the comparison voltage Vcmp by the comparator 22. When the comparison voltage Vcmp is smaller than the reference voltage Vref, the control unit 20 turns on the switching element 18 to flow current to the LED 102, and when the comparison voltage Vcmp becomes larger than the reference voltage Vref, the control unit 20 turns off the switching element 18. To interrupt the current to the LED 102.

このようにして、ＬＥＤ１０２に流れる電流を制御し、ＬＥＤ１０２の平均的な発光強度を制御することができる。   In this manner, the current flowing through the LED 102 can be controlled, and the average light emission intensity of the LED 102 can be controlled.

ところで、白熱電球用の発光強度（明るさ）を調光できるシステムが用いられている。白熱電球の調光システムは、図４に示すように、交流電源の導通角を制御して、白熱電球に流れる電流の平均値を低下させることによって発光強度を制御する。   By the way, a system capable of dimming the light emission intensity (brightness) for an incandescent lamp is used. As shown in FIG. 4, the dimming system of the incandescent bulb controls the light emission intensity by controlling the conduction angle of the AC power supply and lowering the average value of the current flowing through the incandescent bulb.

一方、ＬＥＤを発光素子として用いる場合においても発光強度を調光できるシステムが望まれている。これまで、ＬＥＤの調光システムでは、交流電圧をデジタル電圧信号に変換して処理する回路、交流電圧がオフとなる時間を検出してインバータの発振を停止させる回路が用いられている。   On the other hand, there is a demand for a system capable of dimming the emission intensity even when an LED is used as a light emitting element. So far, LED dimming systems have used a circuit for converting an AC voltage into a digital voltage signal and processing, and a circuit for detecting the time when the AC voltage is turned off and stopping the oscillation of the inverter.

しかしながら、これらの回路は、従来から住宅等のインフラとして備えられている白熱電球に対するシステムとは異なる回路として供給しなければならず、それぞれの回路も規模が比較的大きくなるので、ＬＥＤの制御システムとして製造コストが増大する等の問題がある。   However, these circuits must be supplied as circuits different from the system for the incandescent light bulb that has been conventionally provided as an infrastructure such as a house, and each circuit also has a relatively large scale. There is a problem that the manufacturing cost increases.

したがって、従来の白熱電球用の調光用の回路を流用してＬＥＤの調光を可能とする制御回路が望まれている。   Therefore, there is a demand for a control circuit that enables dimming of LEDs by diverting a conventional dimming circuit for incandescent bulbs.

本発明の１つの態様は、交流電源を全波整流する整流部と、前記整流部で整流された電圧を平滑化するコンデンサと、前記平滑化された電圧を受けて発光する発光素子に流れる電流をスイッチングするスイッチング素子と、前記平滑化された電圧を分圧して基準電圧を得る分圧回路と、前記発光素子に流れる電流に応じた比較電圧と、前記基準電圧と、を比較する比較器と、前記比較器による比較結果に応じて、前記スイッチング素子のスイッチングを制御する制御部と、を備えることを特徴とする発光素子の制御回路である。   One aspect of the present invention includes a rectifier that full-wave rectifies an AC power supply, a capacitor that smoothes the voltage rectified by the rectifier, and a current that flows through a light-emitting element that receives the smoothed voltage to emit light. A switching element for switching the smoothing voltage, a voltage dividing circuit for dividing the smoothed voltage to obtain a reference voltage, a comparison voltage corresponding to a current flowing through the light emitting element, and a comparator for comparing the reference voltage And a control unit that controls switching of the switching element according to a comparison result by the comparator.

ここで、前記制御部は、前記比較電圧が前記基準電圧より大きい場合に前記発光素子に電流が流れるように前記スイッチング素子を制御し、前記比較電圧が前記基準電圧より小さい場合に前記発光素子に電流が流れないように前記スイッチング素子を制御することが好適である。   Here, the control unit controls the switching element such that a current flows through the light emitting element when the comparison voltage is greater than the reference voltage, and applies to the light emitting element when the comparison voltage is smaller than the reference voltage. It is preferable to control the switching element so that no current flows.

本発明によれば、従来の白熱電球用の調光用回路を流用してＬＥＤの調光を可能とする発光素子の制御回路を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the control circuit of the light emitting element which enables the light control of LED by diverting the conventional light control circuit for incandescent lamps can be provided.

本発明の実施の形態における発光素子の制御回路の構成を示す図である。It is a figure which shows the structure of the control circuit of the light emitting element in embodiment of this invention. 本発明の実施の形態における発光素子の制御回路の作用を示す図である。It is a figure which shows the effect | action of the control circuit of the light emitting element in embodiment of this invention. 従来のＬＥＤの発光の制御回路の構成を示す図である。It is a figure which shows the structure of the conventional control circuit of light emission of LED. 従来の白熱電球の発光の制御回路の構成を示す図である。It is a figure which shows the structure of the control circuit of light emission of the conventional incandescent lamp.

本発明の実施の形態における発光素子の制御回路２００は、図１に示すように、整流部３０、平滑用コンデンサ３２、チョークコイル３４、回生用ダイオード３６、スイッチング素子３８、制御部４０、比較器４２及び分圧回路４４を含んで構成される。また、本実施の形態における制御回路２００における各部の電圧・電流について図２に示す。   As shown in FIG. 1, the light emitting element control circuit 200 according to the embodiment of the present invention includes a rectifying unit 30, a smoothing capacitor 32, a choke coil 34, a regenerative diode 36, a switching element 38, a control unit 40, and a comparator. 42 and a voltage dividing circuit 44. In addition, FIG. 2 shows voltages and currents of respective portions in the control circuit 200 in the present embodiment.

制御回路２００は、発光素子の発光の制御を行う。例えば、照明用の発光ダイオード（ＬＥＤ）１０２に接続され、ＬＥＤ１０２への電流の制御を行う。   The control circuit 200 controls light emission of the light emitting element. For example, it is connected to a light emitting diode (LED) 102 for illumination, and controls the current to the LED 102.

また、制御回路２００は、白熱電球の調光システムに用いられる交流電圧Ｓｉｎの導通角を制御する調光回路２０２に接続されて使用される。調光回路２０２は、制御回路２００の整流部３０に接続される。すなわち、調光回路２０２は、交流電圧Ｓｉｎを受けて、調光ボリューム等の調整信号に応じて交流電圧Ｓｉｎの導通角を調整して調整交流電圧Ｓｍｏｄを出力する。   The control circuit 200 is used by being connected to a dimming circuit 202 that controls the conduction angle of the AC voltage Sin used in the dimming system of the incandescent bulb. The dimming circuit 202 is connected to the rectifying unit 30 of the control circuit 200. That is, the dimming circuit 202 receives the AC voltage Sin, adjusts the conduction angle of the AC voltage Sin according to an adjustment signal such as a dimming volume, and outputs the adjusted AC voltage Smod.

整流部３０は、整流ブリッジ回路３０ａを含んで構成される。整流部３０は、調整交流電圧Ｓｍｏｄを受けて、調整交流電圧Ｓｍｏｄを全波整流して全波整流電圧Ｓｒｅｃとして出力する。整流部３０には、図１に示すように、保護用のフューズ３０ｂやノイズ除去のためのフィルタ３０ｃを設けてもよい。   The rectifying unit 30 includes a rectifying bridge circuit 30a. The rectifier 30 receives the adjusted AC voltage Smod, performs full-wave rectification on the adjusted AC voltage Smod, and outputs it as a full-wave rectified voltage Srec. As shown in FIG. 1, the rectifying unit 30 may be provided with a protective fuse 30b and a filter 30c for removing noise.

整流部３０の後段には、大容量の平滑用コンデンサ３２を設ける。これによって、全波整流電圧Ｓｒｅｃが平滑化された平滑電圧Ｓｄｃとされる。これにより、交流電圧Ｓｉｎの導通角を調整して得られた調整交流電圧Ｓｍｏｄの平均値を反映した平滑電圧Ｓｄｃとなる。この平滑電圧ＳｄｃによりＬＥＤ１０２を発光させることによって、調光回路２０２によってＬＥＤ１０２の調光を行うことが可能となる。   A large-capacity smoothing capacitor 32 is provided after the rectifying unit 30. As a result, the full-wave rectified voltage Srec is converted into a smoothed voltage Sdc. As a result, the smoothed voltage Sdc reflects the average value of the adjusted AC voltage Smod obtained by adjusting the conduction angle of the AC voltage Sin. By causing the LED 102 to emit light with the smooth voltage Sdc, the dimming circuit 202 can dim the LED 102.

ＬＥＤ１０２のアノード端子には平滑電圧Ｓｄｃが供給される。ＬＥＤ１０２のカソード端子は、チョークコイル３４、スイッチング素子３８及び電圧検出用抵抗Ｒ１を介して接地される。   A smoothing voltage Sdc is supplied to the anode terminal of the LED 102. The cathode terminal of the LED 102 is grounded via the choke coil 34, the switching element 38, and the voltage detection resistor R1.

チョークコイル３４は、ＬＥＤ１０２及びスイッチング素子３８を流れる電流を断続したものにするために設けられる。チョークコイル３４には、図１に示すように、制御部４０への電源電圧も供給できるようにフォワード巻線を設けてもよい。   The choke coil 34 is provided to make the current flowing through the LED 102 and the switching element 38 intermittent. As shown in FIG. 1, the choke coil 34 may be provided with a forward winding so that the power supply voltage to the control unit 40 can also be supplied.

スイッチング素子３８は、ＬＥＤ１０２への電流を供給・遮断するために設けられる。スイッチング素子３８は、ＬＥＤ１０２の消費電力に応じた容量を有する素子とし、例えば、大電力パワー電界効果トランジスタ（ＭＯＳＦＥＴ）等が用いられる。スイッチング素子３８は、制御部４０によってスイッチング制御される。   The switching element 38 is provided to supply / cut off the current to the LED 102. The switching element 38 is an element having a capacity corresponding to the power consumption of the LED 102, and for example, a high power power field effect transistor (MOSFET) or the like is used. Switching of the switching element 38 is controlled by the control unit 40.

回生用ダイオード３６は、フライホイールダイオードであり、ＬＥＤ１０２及びチョークコイル３４に並列に接続される。回生用ダイオード３６は、スイッチング素子３８が遮断されたときにチョークコイル３４に蓄えられているエネルギーをＬＥＤ１０２へ回生する。   The regenerative diode 36 is a flywheel diode, and is connected to the LED 102 and the choke coil 34 in parallel. The regenerative diode 36 regenerates the energy stored in the choke coil 34 to the LED 102 when the switching element 38 is cut off.

分圧回路４４は、整流部３０に得られた平滑電圧Ｓｄｃを分圧して基準電圧Ｖｒｅｆを生成して比較器４２へ出力する。分圧回路４４は、例えば、抵抗Ｒ２及びＲ３の直列接続とすることができる。抵抗Ｒ２及びＲ３によって平滑電圧Ｓｄｃを分圧し、抵抗Ｒ３の端子電圧を基準電圧Ｖｒｅｆとして比較器４２の非反転入力端子へ入力する。分圧回路４４によって、図２に示すように、基準電圧Ｖｒｅｆは、平滑電圧Ｓｄｃの変化に比例した変化を示す。   The voltage dividing circuit 44 divides the smoothed voltage Sdc obtained in the rectifying unit 30 to generate a reference voltage Vref and outputs it to the comparator 42. The voltage dividing circuit 44 can be, for example, a series connection of resistors R2 and R3. The smoothing voltage Sdc is divided by the resistors R2 and R3, and the terminal voltage of the resistor R3 is input to the non-inverting input terminal of the comparator 42 as the reference voltage Vref. As shown in FIG. 2, the reference voltage Vref shows a change proportional to the change of the smoothing voltage Sdc by the voltage dividing circuit 44.

比較器４２は、ＬＥＤ１０２を流れる電流によって電圧検出抵抗Ｒ１の両端に発生する比較電圧Ｖｃｍｐを反転入力端子に受ける。また、比較器４２は、分圧回路４４によって平滑電圧Ｓｄｃを分圧して得られた基準電圧Ｖｒｅｆを非反転入力端子に受ける。比較器４２は、比較電圧Ｖｃｍｐと基準電圧Ｖｒｅｆとを比較し、比較結果を制御部４０へ出力する。   The comparator 42 receives the comparison voltage Vcmp generated at both ends of the voltage detection resistor R1 by the current flowing through the LED 102 at the inverting input terminal. Further, the comparator 42 receives the reference voltage Vref obtained by dividing the smoothed voltage Sdc by the voltage dividing circuit 44 at the non-inverting input terminal. The comparator 42 compares the comparison voltage Vcmp with the reference voltage Vref and outputs the comparison result to the control unit 40.

制御部４０は、比較器４２による基準電圧Ｖｒｅｆと比較電圧Ｖｃｍｐとの比較結果に基づいてスイッチング素子３８のスイッチングを制御する。制御部４０は、半導体集積回路として構成される。制御部４０は、比較電圧Ｖｃｍｐが基準電圧Ｖｒｅｆより小さい場合にはスイッチング素子３８をオンにしてＬＥＤ１０２へ電流を流し、比較電圧Ｖｃｍｐが基準電圧Ｖｒｅｆより大きくなった場合にはスイッチング素子３８をオフにしてＬＥＤ１０２への電流を遮断する。   The control unit 40 controls the switching of the switching element 38 based on the comparison result between the reference voltage Vref and the comparison voltage Vcmp by the comparator 42. The control unit 40 is configured as a semiconductor integrated circuit. When the comparison voltage Vcmp is smaller than the reference voltage Vref, the control unit 40 turns on the switching element 38 to pass a current to the LED 102, and when the comparison voltage Vcmp becomes larger than the reference voltage Vref, the control unit 40 turns off the switching element 38. To interrupt the current to the LED 102.

このような比較器４２と制御部４０との働きによって、図２に示すように、ＬＥＤ１０２に流れる電流Ｉは、比較電圧Ｖｃｍｐが平滑電圧Ｓｄｃに対応する基準電圧Ｖｒｅｆに上昇するまで流れ、基準電圧Ｖｒｅｆを超えると遮断される状態を繰り返す。これにより、ＬＥＤ１０２の定格電流を超えることなく、平滑電圧Ｓｄｃに応じた電流Ｉを流すことができる。   2, the current I flowing through the LED 102 flows until the comparison voltage Vcmp rises to the reference voltage Vref corresponding to the smoothing voltage Sdc, as shown in FIG. When Vref is exceeded, the state of being interrupted is repeated. Thereby, the electric current I according to the smoothing voltage Sdc can be sent, without exceeding the rated current of LED102.

また、基準電圧Ｖｒｅｆは調光回路２０２による調光の程度に応じた平滑電圧Ｓｄｃに応じた値となるので、ＬＥＤ１０２に流れる電流Ｉの平均値も調光回路２０２による調光の程度に応じて調整されることになる。このようにして、ＬＥＤ１０２の発光強度も調光回路２０２による調光によって制御できる。   Further, since the reference voltage Vref has a value corresponding to the smoothing voltage Sdc corresponding to the degree of dimming by the dimming circuit 202, the average value of the current I flowing through the LED 102 also depends on the degree of dimming by the dimming circuit 202. Will be adjusted. In this way, the light emission intensity of the LED 102 can also be controlled by dimming by the dimming circuit 202.

なお、入力される交流電圧Ｓｉｎによっては、基準電圧Ｖｒｅｆが高くなり過ぎる可能性があるので、図１に示すように、分圧回路４４に基準電圧Ｖｒｅｆを所定電圧Ｖｍａｘ以下にクランプするためのツェナーダイオード４４ａを設けてもよい。   Since the reference voltage Vref may become too high depending on the input AC voltage Sin, a Zener for clamping the reference voltage Vref to a predetermined voltage Vmax or less in the voltage dividing circuit 44 as shown in FIG. A diode 44a may be provided.

１０ 整流部、１２ 整流用コンデンサ、１４ チョークコイル、１６ 回生用ダイオード、１８ スイッチング素子、２０ 制御部、２２ 比較器、３０ 整流部、３０ａ 整流ブリッジ回路、３０ｂ フューズ、３０ｃ フィルタ、３２ 平滑用コンデンサ、３４ チョークコイル、３６ 回生用ダイオード、３８ スイッチング素子、４０ 制御部、４２ 比較器、４４ 分圧回路、４４ａ ツェナーダイオード、１００，２００ 制御回路、２０２ 調光回路。   10 rectifiers, 12 rectifier capacitors, 14 choke coils, 16 regenerative diodes, 18 switching elements, 20 control units, 22 comparators, 30 rectifiers, 30a rectifier bridge circuits, 30b fuses, 30c filters, 32 smoothing capacitors, 34 choke coil, 36 regenerative diode, 38 switching element, 40 control unit, 42 comparator, 44 voltage dividing circuit, 44a zener diode, 100, 200 control circuit, 202 dimming circuit.

Claims (2)

交流電源を全波整流する整流部と、
前記整流部で整流された電圧を平滑化するコンデンサと、
前記平滑化された電圧を受けて発光する発光素子に流れる電流をスイッチングするスイッチング素子と、
前記平滑化された電圧を分圧して基準電圧を得る分圧回路と、
前記発光素子に流れる電流に応じた比較電圧と、前記基準電圧と、を比較する比較器と、
前記比較器による比較結果に応じて、前記スイッチング素子のスイッチングを制御する制御部と、
を備えることを特徴とする発光素子の制御回路。 A rectifying unit for full-wave rectification of the AC power supply;
A capacitor for smoothing the voltage rectified by the rectifying unit;
A switching element that switches a current flowing in a light emitting element that receives the smoothed voltage and emits light;
A voltage dividing circuit for dividing the smoothed voltage to obtain a reference voltage;
A comparator for comparing a reference voltage according to a current flowing through the light emitting element and the reference voltage;
A control unit for controlling switching of the switching element according to a comparison result by the comparator;
A control circuit for a light-emitting element, comprising: 請求項１に記載の制御回路であって、
前記制御部は、前記比較電圧が前記基準電圧より大きい場合に前記発光素子に電流が流れるように前記スイッチング素子を制御し、前記比較電圧が前記基準電圧より小さい場合に前記発光素子に電流が流れないように前記スイッチング素子を制御することを特徴とする制御回路。 The control circuit according to claim 1,
The controller controls the switching element such that a current flows through the light emitting element when the comparison voltage is greater than the reference voltage, and a current flows through the light emitting element when the comparison voltage is smaller than the reference voltage. A control circuit for controlling the switching element so as not to exist.
JP2009094707A 2009-04-09 2009-04-09 Control circuit for light emitting device Pending JP2010244958A (en)

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JP2009094707A JP2010244958A (en) 2009-04-09 2009-04-09 Control circuit for light emitting device
TW099105585A TW201038129A (en) 2009-04-09 2010-02-26 Control circuit for light emitting element
CN2010101498980A CN101861009B (en) 2009-04-09 2010-03-26 Control circuit for light emitting device
US12/757,197 US8330380B2 (en) 2009-04-09 2010-04-09 Control circuit for light emitting device

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CN102740549A (en) * 2011-03-29 2012-10-17 半导体元件工业有限责任公司 Led dimmer circuit
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