JP2019160538A - LED drive circuit - Google Patents

LED drive circuit Download PDF

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JP2019160538A
JP2019160538A JP2018044880A JP2018044880A JP2019160538A JP 2019160538 A JP2019160538 A JP 2019160538A JP 2018044880 A JP2018044880 A JP 2018044880A JP 2018044880 A JP2018044880 A JP 2018044880A JP 2019160538 A JP2019160538 A JP 2019160538A
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resistor
connector
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light emitting
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JP7097049B2 (en
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英太郎 染谷
Eitaro Someya
英太郎 染谷
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Eiko Lighting Co Ltd
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Eiko Lighting Co Ltd
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Abstract

CONSTITUTION: A three-terminal regulator 16 has a Vin terminal, a Vout terminal, and an ADJ terminal. One terminal of a first resistor R1 is connected to the Vout terminal, and the other terminal of the first resistor R1 is connected to the ADJ terminal. One terminal of a second resistor R2 is connected to the Vout terminal, and the other terminal of the second resistor R2 is connected to the anode of an organic EL diode L1. One terminal of a variable resistor VR1 is connected to the other terminal of the first resistor R1.EFFECT: The amount of light emitted from an organic EL diode L1 can be finely adjusted during use.SELECTED DRAWING: Figure 1

Description

この発明は、発光ダイオードの駆動回路に関し、特に、発光ダイオードを定電流駆動方式で駆動する、駆動回路に関する。   The present invention relates to a driving circuit for a light emitting diode, and more particularly to a driving circuit for driving a light emitting diode by a constant current driving method.

この種の駆動回路の一例が、特許文献１の図１に開示されている。特許文献１の図１によれば、駆動対象のＬＥＤ１およびＬＤＥ２が直列接続される。ＬＥＤ１のアノードは、ＬＥＤ５および抵抗器Ｒ３を介して３端子レギュレータＩＣ１の出力端子に接続されるとともに、直接的に３端子レギュレータＩＣ１の調整端子に接続される。したがって、３端子レギュレータＩＣ１の出力電圧をＶ（ＩＣ１）と定義し、ＬＥＤ５の順方向電圧をＶ（ＬＥＤ５）と定義し、ＬＥＤ１およびＬＥＤ２を流れる電流をＩ３と定義すると、Ｉ３＝Ｖ（ＩＣ１）−Ｖ（ＬＥＤ５）／Ｒ３の関係式が成り立つ。この結果、ＬＥＤ１およびＬＥＤ２は、定電流で駆動される。   An example of this type of drive circuit is disclosed in FIG. According to FIG. 1 of Patent Document 1, the LED 1 and the LDE 2 to be driven are connected in series. The anode of LED1 is connected to the output terminal of the three-terminal regulator IC1 via the LED5 and the resistor R3, and directly connected to the adjustment terminal of the three-terminal regulator IC1. Therefore, if the output voltage of the three-terminal regulator IC1 is defined as V (IC1), the forward voltage of the LED5 is defined as V (LED5), and the current flowing through the LED1 and LED2 is defined as I3, I3 = V (IC1) The relational expression of −V (LED5) / R3 is established. As a result, LED1 and LED2 are driven with a constant current.

特許第４９１１７４７号公報Japanese Patent No. 4911747

しかし、抵抗器Ｒ３の抵抗値が固定的であるため、ＬＥＤ１，ＬＥＤ２およびＬＥＤ５の発光量を使用時に調整することはできない。ここで、抵抗器Ｒ３として可変抵抗を用いれば、抵抗値に応じて発光量が変化するが、ＬＥＤの特性上、発光量を微調整することは困難である。   However, since the resistance value of the resistor R3 is fixed, the light emission amounts of the LED1, LED2, and LED5 cannot be adjusted during use. Here, if a variable resistor is used as the resistor R3, the light emission amount changes according to the resistance value, but it is difficult to finely adjust the light emission amount due to the characteristics of the LED.

それゆえに、この発明の主たる目的は、発光量を使用時に微調整することができる、発光ダイオードの駆動回路を提供することである。   Therefore, a main object of the present invention is to provide a driving circuit for a light emitting diode, in which the amount of light emission can be finely adjusted during use.

この発明に係る発光ダイオードの駆動回路(12：実施例で相当する参照符号。以下同じ)は、入力端子(Vin)と出力端子(Vout)と調整端子(ADJ)とを有する３端子レギュレータ(16)、出力端子および調整端子とそれぞれ接続された一方端子および他方端子を有する第１抵抗器(R1)、および出力端子と接続された一方端子を有する第２抵抗器(R2, R21~R23)を備え、発光ダイオード(L1~L3)のアノードは第２抵抗器の他方端子に接続され、可変抵抗器(VR1)の一方端子は第１抵抗器の他方端子に接続される。   A light emitting diode driving circuit according to the present invention (12: reference numeral corresponding to the embodiment; the same applies hereinafter) includes a three-terminal regulator (16) having an input terminal (Vin), an output terminal (Vout), and an adjustment terminal (ADJ). ), A first resistor (R1) having one terminal and the other terminal connected to the output terminal and the adjustment terminal, respectively, and a second resistor (R2, R21 to R23) having one terminal connected to the output terminal. The anodes of the light emitting diodes (L1 to L3) are connected to the other terminal of the second resistor, and one terminal of the variable resistor (VR1) is connected to the other terminal of the first resistor.

好ましくは、第２抵抗器の他方端子に接続された第１コネクタ端子(221)がさらに備えられ、発光ダイオードのアノードは第１コネクタ端子に接続される。   Preferably, a first connector terminal (221) connected to the other terminal of the second resistor is further provided, and an anode of the light emitting diode is connected to the first connector terminal.

好ましくは、第１抵抗器の他方端子に接続された第２コネクタ端子(201)がさらに備えられ、可変抵抗器の一方端子は第２コネクタ端子に接続される。   Preferably, a second connector terminal (201) connected to the other terminal of the first resistor is further provided, and one terminal of the variable resistor is connected to the second connector terminal.

好ましくは、発光ダイオードは複数存在し、当該複数の発光ダイオードのアノードが第２抵抗器の他方端子に共通的に接続される。   Preferably, there are a plurality of light emitting diodes, and anodes of the plurality of light emitting diodes are commonly connected to the other terminal of the second resistor.

好ましくは、第２抵抗器および発光ダイオードの各々は複数存在し、当該複数の第２抵抗器の一方端子は出力端子に共通的に接続され、当該複数の第２抵抗器の他方端子は当該複数の発光ダイオードのアノードにそれぞれ接続される。   Preferably, there are a plurality of second resistors and light emitting diodes, one terminal of the plurality of second resistors is commonly connected to an output terminal, and the other terminal of the plurality of second resistors is the plurality of the plurality of second resistors. Are connected to the anodes of the light emitting diodes.

好ましくは、照明装置(10)は、上述の駆動回路を備える。   Preferably, the lighting device (10) includes the drive circuit described above.

出力端子と調整端子との間の電位差は第１抵抗器によって規定され、発光ダイオードを流れる電流値は当該電位差と第２抵抗器の抵抗値とによって規定される。一方、発光ダイオードのアノード電圧は、可変抵抗器の抵抗値に応じて変動する。これによって、発光ダイオードの発光量を使用時に微調整することができる。   The potential difference between the output terminal and the adjustment terminal is defined by the first resistor, and the current value flowing through the light emitting diode is defined by the potential difference and the resistance value of the second resistor. On the other hand, the anode voltage of the light emitting diode varies according to the resistance value of the variable resistor. Thereby, the light emission amount of the light emitting diode can be finely adjusted at the time of use.

この発明の上述の目的，その他の目的，特徴および利点は、図面を参照して行う以下の実施例の詳細な説明から一層明らかとなろう。   The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

この実施例の照明装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the illuminating device of this Example. 図１に示す照明装置を構成する調光スイッチの外観を示す外観図である。It is an external view which shows the external appearance of the light control switch which comprises the illuminating device shown in FIG. 他の実施例の照明装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the illuminating device of another Example. その他の実施例の照明装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the illuminating device of another Example.

図１を参照して、この実施例の照明装置１０は、いわゆる有機ＥＬ照明装置であり、有機ＥＬダイオード（有機発光ダイオード）Ｌ１を発光させる駆動回路１２と、有機ＥＬダイオードＬ１の発光量を微調整するためにユーザによって操作される調光スイッチ１４とを備える。   Referring to FIG. 1, an illuminating device 10 of this embodiment is a so-called organic EL illuminating device, and a driving circuit 12 that emits light from an organic EL diode (organic light emitting diode) L1 and a light emission amount of the organic EL diode L1 are set small. And a dimming switch 14 operated by the user for adjustment.

駆動回路１２は、Ｖｉｎ端子（入力端子），Ｖｏｕｔ端子（出力端子）およびＡＤＪ端子（調整端子）が設けられた３端子レギュレータ（シリーズレギュレータ）１６と、コネクタ１８，２０および２２とを含む。Ｖｉｎ端子は、コネクタ１８の一方端子１８１と接続される。Ｖｏｕｔ端子は、第１抵抗器Ｒ１を介してＡＤＪ端子およびコネクタ２０の一方端子２０１と接続され、第２抵抗器Ｒ２を介してコネクタ２２の一方端子２２１と接続される。コネクタ１８の他方端子１８２は、コネクタ２２の他方端子２２２と直接的に接続されるとともに、第３抵抗器Ｒ３を介してコネクタ２０の他方端子２０２と接続される。   The drive circuit 12 includes a three-terminal regulator (series regulator) 16 provided with a Vin terminal (input terminal), a Vout terminal (output terminal) and an ADJ terminal (adjustment terminal), and connectors 18, 20 and 22. The Vin terminal is connected to one terminal 181 of the connector 18. The Vout terminal is connected to the ADJ terminal and one terminal 201 of the connector 20 via the first resistor R1, and is connected to one terminal 221 of the connector 22 via the second resistor R2. The other terminal 182 of the connector 18 is directly connected to the other terminal 222 of the connector 22 and is connected to the other terminal 202 of the connector 20 via the third resistor R3.

なお、３端子レギュレータ１６としては、たとえば、オン・セミコンダクター社製のＬＭ３１７ＢＤ２ＴＧが適用される。   As the three-terminal regulator 16, for example, LM317BD2TG manufactured by ON Semiconductor is applied.

調光スイッチ１４は、図２に示す外観を有し、スイッチＳＷ１および可変抵抗器ＶＲ１を備える。スイッチＳＷ１の一方端子は直流電源Ｖｃｃと接続され、スイッチＳＷ１の他方端子はコネクタ１８の一方端子１８１と接続される。また、可変抵抗器ＶＲ１の一方端子はコネクタ２０の一方端子２０１と接続され、可変抵抗器ＶＲ１の他方端子はコネクタ２０の他方端子２０２と接続される。   The dimming switch 14 has the appearance shown in FIG. 2, and includes a switch SW1 and a variable resistor VR1. One terminal of the switch SW1 is connected to the DC power supply Vcc, and the other terminal of the switch SW1 is connected to one terminal 181 of the connector 18. Further, one terminal of the variable resistor VR1 is connected to one terminal 201 of the connector 20, and the other terminal of the variable resistor VR1 is connected to the other terminal 202 of the connector 20.

有機ＥＬダイオードＬ１のアノードはコネクタ２２の一方端子２２１と接続され、有機ＥＬダイオードＬ１のカソードはコネクタ２２の他方端子２２２と接続される。なお、コネクタ１８の他方端子１８２は基準電位面と接続される。   The anode of the organic EL diode L1 is connected to one terminal 221 of the connector 22, and the cathode of the organic EL diode L1 is connected to the other terminal 222 of the connector 22. The other terminal 182 of the connector 18 is connected to the reference potential surface.

スイッチＳＷ１は、図２に示すダイヤル１４ｔの目盛りを“ＯＦＦ”に合わせたときにオフされる。この状態からダイヤル１４ｔを時計回り方向に回転させると、スイッチＳＷ１がオンされ、可変抵抗器ＶＲ１の抵抗値が増大される。   The switch SW1 is turned off when the scale of the dial 14t shown in FIG. 2 is set to “OFF”. When the dial 14t is rotated clockwise from this state, the switch SW1 is turned on and the resistance value of the variable resistor VR1 is increased.

以上のように、３端子レギュレータ１６は、Ｖｉｎ端子とＶｏｕｔ端子とＡＤＪ端子とを有する。第１抵抗器Ｒ１の一方端子はＶｏｕｔ端子と接続され、第１抵抗器Ｒ１の他方端子はＡＤＪ端子と接続される。第２抵抗器Ｒ２の一方端子はＶｏｕｔ端子と接続され、第２抵抗器Ｒ２の他方端子は有機ＥＬダイオードＬ１のアノードと接続される。可変抵抗器ＶＲ１の一方端子は、第１抵抗器Ｒ１の他方端子に接続される。   As described above, the three-terminal regulator 16 has a Vin terminal, a Vout terminal, and an ADJ terminal. One terminal of the first resistor R1 is connected to the Vout terminal, and the other terminal of the first resistor R1 is connected to the ADJ terminal. One terminal of the second resistor R2 is connected to the Vout terminal, and the other terminal of the second resistor R2 is connected to the anode of the organic EL diode L1. One terminal of the variable resistor VR1 is connected to the other terminal of the first resistor R1.

したがって、Ｖｏｕｔ端子とＡＤＪ端子との間の電位差は第１抵抗器Ｒ１によって規定され、有機ＥＬダイオードＬ１を流れる電流値は当該電位差と第２抵抗器Ｒ２の抵抗値とによって規定される。一方、有機ＥＬダイオードＬ１のアノード電圧は、可変抵抗器ＶＲ１の抵抗値に応じて変動する。これによって、有機ＥＬダイオードＬ１の発光量を使用時に微調整することができる。   Therefore, the potential difference between the Vout terminal and the ADJ terminal is defined by the first resistor R1, and the current value flowing through the organic EL diode L1 is defined by the potential difference and the resistance value of the second resistor R2. On the other hand, the anode voltage of the organic EL diode L1 varies according to the resistance value of the variable resistor VR1. Thereby, the light emission amount of the organic EL diode L1 can be finely adjusted at the time of use.

また、有機ＥＬダイオードＬ１はコネクタ２２を介して駆動回路１２と接続され、可変抵抗器ＶＲ１はコネクタ２０を介して駆動回路１２と接続されるため、有機ＥＬダイオードＬ１を外付けできるとともに、可変抵抗器ＶＲ１を備える調光スイッチ１４を外付けできる。   Further, since the organic EL diode L1 is connected to the drive circuit 12 via the connector 22, and the variable resistor VR1 is connected to the drive circuit 12 via the connector 20, the organic EL diode L1 can be externally attached, and the variable resistance A dimming switch 14 equipped with a device VR1 can be externally attached.

図３を参照して、他の実施例の照明装置１０は、コネクタ２４および２６と有機ＥＬダイオードＬ２およびＬ３が追加された点を除き、図１に示す照明装置１０と同じである。したがって、共通の構成については共通の参照番号を付することで、重複した説明を省略する。   With reference to FIG. 3, the illuminating device 10 of another Example is the same as the illuminating device 10 shown in FIG. 1 except that the connectors 24 and 26 and the organic EL diodes L2 and L3 are added. Therefore, the common description is attached | subjected about a common structure and the duplicate description is abbreviate | omitted.

図３によれば、有機ＥＬダイオードＬ２のアノードおよびカソードは、コネクタ２４の一方端子２４１および他方端子２４２にそれぞれ接続される。また、有機ＥＬダイオードＬ３のアノードおよびカソードは、コネクタ２６の一方端子２６１および他方端子２６２にそれぞれ接続される。   According to FIG. 3, the anode and cathode of the organic EL diode L <b> 2 are connected to one terminal 241 and the other terminal 242 of the connector 24, respectively. The anode and cathode of the organic EL diode L3 are connected to one terminal 261 and the other terminal 262 of the connector 26, respectively.

したがって、コネクタ２２の一方端子２２１に加えて、コネクタ２４の一方端子２４１およびコネクタ２６の一方端子２６１が、第２抵抗器Ｒ２の他方端子と接続される。換言すれば、第２抵抗器Ｒ２の他方端子には、有機ＥＬダイオードＬ１〜Ｌ３のアノードが共通的に接続される。   Therefore, in addition to the one terminal 221 of the connector 22, the one terminal 241 of the connector 24 and the one terminal 261 of the connector 26 are connected to the other terminal of the second resistor R2. In other words, the anodes of the organic EL diodes L1 to L3 are commonly connected to the other terminal of the second resistor R2.

一方、コネクタ２４の他方端子２４２およびコネクタ２６の他方端子２６２の各々は、コネクタ１８の他方端子１８２と直接的に接続されるとともに、第３抵抗器Ｒ３を介してコネクタ２０の他方端子２０２と接続される。さらに、第２抵抗器Ｒ２の抵抗値は、図１に示す第２抵抗器Ｒ２の抵抗値の１／３とされる。   On the other hand, each of the other terminal 242 of the connector 24 and the other terminal 262 of the connector 26 is directly connected to the other terminal 182 of the connector 18 and also connected to the other terminal 202 of the connector 20 via the third resistor R3. Is done. Further, the resistance value of the second resistor R2 is set to 1/3 of the resistance value of the second resistor R2 shown in FIG.

この結果、第２抵抗器Ｒ２を導通した電流は、コネクタ２２〜２６の上流で３つに分岐した後に、有機ＥＬダイオードＬ１〜Ｌ３に供給される。この実施例においても、有機ＥＬダイオードＬ１〜Ｌ３のアノード電圧は可変抵抗器ＶＲ１の抵抗値に応じて変動するため、有機ＥＬダイオードＬ１〜Ｌ３の発光量を使用時に微調整することができる。   As a result, the current that has been conducted through the second resistor R2 is supplied to the organic EL diodes L1 to L3 after branching into three upstream of the connectors 22 to 26. Also in this embodiment, since the anode voltages of the organic EL diodes L1 to L3 vary according to the resistance value of the variable resistor VR1, the light emission amounts of the organic EL diodes L1 to L3 can be finely adjusted during use.

図４を参照して、その他の実施例の照明装置１０は、抵抗器Ｒ２の代わりに抵抗器Ｒ２１〜Ｒ２３が設けられる点を除き、図３に示す照明装置１０と同じである。したがって、共通の構成については共通の参照番号を付することで、重複した説明を省略する。   With reference to FIG. 4, the illuminating device 10 of the other Example is the same as the illuminating device 10 shown in FIG. 3 except that resistors R21-R23 are provided instead of the resistor R2. Therefore, the common description is attached | subjected about a common structure and the duplicate description is abbreviate | omitted.

図４によれば、抵抗器Ｒ２１〜Ｒ２３の一方端子は、Ｖｏｕｔ端子に共通的に接続される。これに対して、抵抗器Ｒ２１の他方端子はコネクタ２２の一方端子２２１に接続され、抵抗器Ｒ２２の他方端子はコネクタ２４の一方端子２４１に接続され、抵抗器Ｒ２３の他方端子はコネクタ２６の一方端子２６１に接続される。つまり、抵抗器Ｒ２１〜Ｒ２３の他方端子は、有機ＥＬダイオードＬ１〜Ｌ３のアノードにそれぞれ接続される。なお、第２抵抗器Ｒ２１〜Ｒ２３の各々の抵抗値は、図１に示す第２抵抗器Ｒ２の抵抗値と一致する。   According to FIG. 4, one terminals of resistors R21 to R23 are commonly connected to the Vout terminal. On the other hand, the other terminal of the resistor R21 is connected to one terminal 221 of the connector 22, the other terminal of the resistor R22 is connected to one terminal 241 of the connector 24, and the other terminal of the resistor R23 is one of the connectors 26. Connected to terminal 261. That is, the other terminals of the resistors R21 to R23 are connected to the anodes of the organic EL diodes L1 to L3, respectively. In addition, each resistance value of 2nd resistor R21-R23 corresponds with the resistance value of 2nd resistor R2 shown in FIG.

この結果、有機ＥＬダイオードＬ１を流れる電流値は、Ｖｏｕｔ端子とＡＤＪ端子との間の電位差と第２抵抗器Ｒ２１の抵抗値とによって規定される。また、有機ＥＬダイオードＬ２を流れる電流値は、Ｖｏｕｔ端子とＡＤＪ端子との間の電位差と第２抵抗器Ｒ２２の抵抗値とによって規定される。さらに、有機ＥＬダイオードＬ３を流れる電流値は、Ｖｏｕｔ端子とＡＤＪ端子との間の電位差と第２抵抗器Ｒ２３の抵抗値とによって規定される。   As a result, the current value flowing through the organic EL diode L1 is defined by the potential difference between the Vout terminal and the ADJ terminal and the resistance value of the second resistor R21. Further, the current value flowing through the organic EL diode L2 is defined by the potential difference between the Vout terminal and the ADJ terminal and the resistance value of the second resistor R22. Further, the current value flowing through the organic EL diode L3 is defined by the potential difference between the Vout terminal and the ADJ terminal and the resistance value of the second resistor R23.

この実施例においても、有機ＥＬダイオードＬ１〜Ｌ３のアノード電圧は可変抵抗器ＶＲ１の抵抗値に応じて変動するため、有機ＥＬダイオードＬ１〜Ｌ３の発光量を使用時に微調整することができる。また、この実施例では、第２抵抗器Ｒ２１〜Ｒ２３が有機ＥＬダイオードＬ１〜Ｌ３にそれぞれ割り当てられるため、或る有機ＥＬダイオードの着脱に起因する他の有機ＥＬダイオードの発光量の変動を抑えることができる。   Also in this embodiment, since the anode voltages of the organic EL diodes L1 to L3 vary according to the resistance value of the variable resistor VR1, the light emission amounts of the organic EL diodes L1 to L3 can be finely adjusted during use. Further, in this embodiment, since the second resistors R21 to R23 are assigned to the organic EL diodes L1 to L3, respectively, it is possible to suppress fluctuations in the light emission amount of other organic EL diodes due to the attachment / detachment of a certain organic EL diode. Can do.

なお、上述の実施例では、有機ＥＬダイオードを発光させることを想定している。しかし、この発明の駆動回路は、無機ＥＬダイオード（無機発光ダイオード）の発光にも適用することができる。   In the above-described embodiment, it is assumed that the organic EL diode emits light. However, the drive circuit of the present invention can also be applied to light emission of an inorganic EL diode (inorganic light emitting diode).

１０ …照明装置
１２ …駆動回路
１４ …調光スイッチ
１６ …３端子レギュレータ
１８〜２２ …コネクタ
Ｒ１ …第１抵抗器
Ｒ２，Ｒ２１〜Ｒ２３ …第２抵抗器
Ｒ３ …第３抵抗器
ＶＲ１ …可変抵抗器
Ｌ１〜Ｌ３ …有機ＥＬダイオード DESCRIPTION OF SYMBOLS 10 ... Illuminating device 12 ... Drive circuit 14 ... Dimming switch 16 ... 3 terminal regulator 18-22 ... Connector R1 ... 1st resistor R2, R21-R23 ... 2nd resistor R3 ... 3rd resistor VR1 ... Variable resistor L1 to L3 ... Organic EL diode

Claims (6)

入力端子と出力端子と調整端子とを有する３端子レギュレータ、
前記出力端子および前記調整端子とそれぞれ接続された一方端子および他方端子を有する第１抵抗器、および
前記出力端子と接続された一方端子を有する第２抵抗器を備え、
発光ダイオードのアノードは前記第２抵抗器の他方端子に接続され、
可変抵抗器の一方端子は前記第１抵抗器の他方端子に接続される、発光ダイオードの駆動回路。 A three-terminal regulator having an input terminal, an output terminal, and an adjustment terminal;
A first resistor having one terminal and the other terminal connected to the output terminal and the adjustment terminal, respectively, and a second resistor having one terminal connected to the output terminal;
The anode of the light emitting diode is connected to the other terminal of the second resistor,
A drive circuit for a light emitting diode, wherein one terminal of the variable resistor is connected to the other terminal of the first resistor. 前記第２抵抗器の他方端子に接続された第１コネクタ端子をさらに備え、
前記発光ダイオードのアノードは前記第１コネクタ端子に接続される、請求項１記載の駆動回路。 A first connector terminal connected to the other terminal of the second resistor;
The drive circuit according to claim 1, wherein an anode of the light emitting diode is connected to the first connector terminal. 前記第１抵抗器の他方端子に接続された第２コネクタ端子をさらに備え、
前記可変抵抗器の一方端子は前記第２コネクタ端子に接続される、請求項１または２記載の駆動回路。 A second connector terminal connected to the other terminal of the first resistor;
The drive circuit according to claim 1, wherein one terminal of the variable resistor is connected to the second connector terminal. 前記発光ダイオードは複数存在し、
当該複数の発光ダイオードのアノードが前記第２抵抗器の他方端子に共通的に接続される、請求項１ないし３のいずれかに記載の駆動回路。 There are a plurality of the light emitting diodes,
4. The drive circuit according to claim 1, wherein anodes of the plurality of light emitting diodes are commonly connected to the other terminal of the second resistor. 前記第２抵抗器および前記発光ダイオードの各々は複数存在し、
当該複数の第２抵抗器の一方端子は前記出力端子に共通的に接続され、
当該複数の第２抵抗器の他方端子は当該複数の発光ダイオードのアノードにそれぞれ接続される、請求項１ないし３のいずれかに記載の駆動回路。 A plurality of each of the second resistor and the light emitting diode exists,
One terminal of the plurality of second resistors is commonly connected to the output terminal,
4. The drive circuit according to claim 1, wherein the other terminals of the plurality of second resistors are respectively connected to anodes of the plurality of light emitting diodes. 請求項１ないし５のいずれかに記載の駆動回路を備える、照明装置。   A lighting device comprising the drive circuit according to claim 1.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05333806A (en) * 1992-05-29 1993-12-17 Kokusai Electric Co Ltd Brightness adjusting circuit for display unit
JP2005151772A (en) * 2003-11-19 2005-06-09 Toshiba Corp Power supply and electronic device
JP2013508914A (en) * 2009-10-21 2013-03-07 ゼネラル・エレクトリック・カンパニイ High efficiency and low power capacitor charging DC driver
CN104902651A (en) * 2015-06-24 2015-09-09 广西明华科技投资有限公司 LED energy-saving lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05333806A (en) * 1992-05-29 1993-12-17 Kokusai Electric Co Ltd Brightness adjusting circuit for display unit
JP2005151772A (en) * 2003-11-19 2005-06-09 Toshiba Corp Power supply and electronic device
JP2013508914A (en) * 2009-10-21 2013-03-07 ゼネラル・エレクトリック・カンパニイ High efficiency and low power capacitor charging DC driver
CN104902651A (en) * 2015-06-24 2015-09-09 广西明华科技投资有限公司 LED energy-saving lamp

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