JPS6054483A - Drive circuit of led lamp - Google Patents
Drive circuit of led lampInfo
- Publication number
- JPS6054483A JPS6054483A JP58161921A JP16192183A JPS6054483A JP S6054483 A JPS6054483 A JP S6054483A JP 58161921 A JP58161921 A JP 58161921A JP 16192183 A JP16192183 A JP 16192183A JP S6054483 A JPS6054483 A JP S6054483A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- led
- terminal
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H05B45/395—Linear regulators
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Audible And Visible Signals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、発光ダイオード（Ｉ、ＥＤ）を駆動するＬ
Ｅ Ｄランプの駆動回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an L
This invention relates to an ED lamp drive circuit.
従来、ＬＥＤの駆動回路は第１図に示すようにＬ ＥＤ
２のアノードと一方の電源入力端子１ａとの間に直列
に介挿される抵抗（電流制限抵抗）によって構成されて
いたので、電源入力端子１ａ。Conventionally, an LED drive circuit as shown in FIG.
2 and one power input terminal 1a.
Ｉｂ間に印加される電源電圧Ｅの大きさが変更されれば
、この大きさに応じて抵抗ｌの値を変えなければならな
い。しかし、電源Ｅの値に対応して抵抗１の値を変える
ことは、その生産性を向」二させる時の妨げになるのみ
ならず、でき上った製品の凡用性を高めることができな
いという問題がある。さらにこのよう外回路では、電源
電圧Ｅが変動すれば、ξれに応じて］、 Ｅ ］） ２
に供給される電流の大きさが変化し、このＬ Ｅ Ｉ）
２の輝度が変化したり、またその寿命を縮めたりする
という不都合がある。If the magnitude of the power supply voltage E applied across Ib is changed, the value of the resistor l must be changed in accordance with this magnitude. However, changing the value of resistor 1 in accordance with the value of power supply E not only hinders the improvement of productivity, but also makes it impossible to increase the versatility of the finished product. There is a problem. Furthermore, in such an external circuit, if the power supply voltage E fluctuates, E ]) 2
The magnitude of the current supplied to L E I) changes.
There are disadvantages in that the brightness of the light source 2 changes and its lifespan is shortened.
本発明は上記の点に鑑み、電源電圧が変化した場合にお
いても、ＬＥＩ）を定電流駆動することができ、これに
よって回路の共通化を計ってその生産性および凡用性を
向」ニさせることができるとともに、Ｊ、ＥＴ）の輝度
を安定させ、かつその寿命を延すことができるＬ Ｅ
Ｉ）ランプの駆動回路を提供することを目的としている
。In view of the above points, the present invention is capable of driving the LEI with a constant current even when the power supply voltage changes, thereby achieving common circuits and improving productivity and versatility. L E can stabilize the brightness of J, ET) and extend its life.
I) The purpose is to provide a driving circuit for a lamp.
そしてこの発明に、するＬ ｌ’： ］）ランプの駆動
回路においてはこの目的を達成するために、′１ｕ源入
力端子に印加された電源電圧から予め設定されている値
の電流を生成するとともに、この電流を前記ＬＥＤに供
給してこのＬ ＥＤを駆動する定電流回路を具備したこ
とを特徴としている。According to the present invention, in order to achieve this purpose, in the lamp drive circuit, a current of a preset value is generated from the power supply voltage applied to the 1u source input terminal, and The present invention is characterized in that it includes a constant current circuit that supplies this current to the LED to drive the LED.
以下、本発明に係る１・ＥＤランプの駆動回路の実施例
を図面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a drive circuit for a 1.ED lamp according to the present invention will be described based on the drawings.
第２図は本発明によるＬ Ｅ Ｄランプの駆動回路であ
る。図中、３．１０は各々正電源端子、接地端子であり
、正電源端子３には逆電流から回路の損傷を防ぐための
保護ダイオード１のアノードが接続され、かつ同保護ダ
イオード４のカソードは定電流回路５の入力端子５ａに
接続されている。FIG. 2 is a driving circuit for an LED lamp according to the present invention. In the figure, 3 and 10 are a positive power supply terminal and a ground terminal, respectively. The anode of a protection diode 1 for preventing damage to the circuit from reverse current is connected to the positive power supply terminal 3, and the cathode of the protection diode 4 is connected to the positive power supply terminal 3. It is connected to the input terminal 5a of the constant current circuit 5.
入力端子５ａは抵抗６を介して電流制限用のトランジス
タ（以下、これをＴＲと略称する）７のエミッタに接続
されるものであシ、四ＴＲ７のコレクタは出力端子５１
〕を介してＬＥＤ群８の正端子８ａに接続されている。The input terminal 5a is connected to the emitter of a current limiting transistor (hereinafter referred to as TR) 7 via a resistor 6, and the collector of the fourth TR7 is connected to the output terminal 51.
] to the positive terminal 8a of the LED group 8.
Ｌ Ｅ Ｄ群８は前記正端子８ａと負端子８１）との間
にＬＴシＤ ９ 、９ 、・・が直列に介挿されたもの
であり、前記負端子８（は接地ライン１１を介して前記
接ｆ１を端子１０に接続されている。寸だ、前記抵抗６
の両端は検出回路１２の入力端子］、 ２ ａ、 １．
２１）を各々介して１’ Ｒ１３のエミッタおよびベー
スに接Ｕｌ；され、かつ同ＴＲ２１３のコレクタｄ１１
（抗１４を介して前記接地ライン１１に接続されるとと
もに、前記′１冒（１７のベースに接続されている。ず
なわぢここでは、検出回路１２、抵抗６ ｉ、−よびｉ
’ Ｉｔ ７によってＩＪ１！’ Ｉ） ｍ’ ＞＜を
駆動する定電流回路５が構成されている。In the LED group 8, LT switches D 9 , 9 , . . . are inserted in series between the positive terminal 8a and the negative terminal 81), and the negative terminal 8 is The contact f1 is connected to the terminal 10.
Both ends are input terminals of the detection circuit 12], 2 a, 1.
21) are connected to the emitter and base of 1' R13 through each, and the collector d11 of the same TR213.
(connected to the ground line 11 via the resistor 14, and also connected to the base of the '1' line (17).
'It 7 by IJ1! A constant current circuit 5 is configured to drive 'I) m'><.
このようにこの実施例においては、抵抗６によってＬ
ＥＤ群８に（Ｊｌ、給されている電流の大きさ全検出す
るとともに、この検出結果をｑ’ｎ、１３によって反転
してＴＲ７のベースに供給するようにしたので２例えば
正電源端子３に印加されている電圧Ｅが上昇すれば、こ
れに応じて前記Ｔ Ｉ（、７の一フレクタ電流が増加し
、ＬＥＤ群８に供給される電流が増加しようとするが、
この場合これに応じて抵抗６の両端間に生じる電圧の値
が大きくなってＴＲ１３のコレクタ電流を増加させるの
で、これに対応して’Ｊ’ Ｔｊ ７のベースＰｒ［ｉ
流が減少する。この結果、この’Ｉ’ ｌ ７の導通率
が減少しとの”１１’ Ｒ，７のコレクタ電流、すなわ
ち前記Ｌ Ｅ Ｄ群８に供給される電流の値が一定値に
保たれる。このようにとの回路においては、前記正電源
端子３に印加される電圧が高くなってもＬ Ｅ Ｄ群８
には常に一定の電流が供給される。In this way, in this embodiment, the resistor 6 allows L
The magnitude of the current supplied to the ED group 8 (Jl) is detected in its entirety, and this detection result is inverted by q'n, 13 and supplied to the base of TR7. When the applied voltage E increases, the one reflector current of the T I (, 7) increases accordingly, and the current supplied to the LED group 8 tends to increase.
In this case, the value of the voltage generated across the resistor 6 increases accordingly, increasing the collector current of the TR13, so that the base Pr[i
flow decreases. As a result, the conductivity of this 'I' l 7 decreases and the collector current of '11' R, 7, that is, the value of the current supplied to the LED group 8, is maintained at a constant value. In this circuit, even if the voltage applied to the positive power supply terminal 3 increases, the LED group 8
is always supplied with a constant current.
また、正電源端子３の電源電圧が下降したときにも同様
にしてＴ ＩＩ、 ７のベース電流が増加するため、こ
のＥ’ Ｔｊ ７の導通率が高くなってそのコレクタ電
流が一定に保たれる。したがってこの場合にも、ＬＥＤ
群８に供給される電流は一定となる。In addition, when the power supply voltage of the positive power supply terminal 3 falls, the base current of T II, 7 increases in the same way, so the conductivity of E' Tj 7 increases and its collector current is kept constant. It will be done. Therefore, in this case as well, the LED
The current supplied to group 8 remains constant.
しかして、’］’ｌｔ７のコレクタに接続されたＬＥＤ
群８（ｄ正電源端子３に印加される電源電圧Ｅの大きさ
にかかわらず第３図の特性曲線ば）に示すようにほぼ一
定電流で駆動されるので、ＬＥＤ群８に供給したい電流
の値に応じて抵抗６の値を設定すれば、電源電圧の変更
または変動にかかわらずＬＥＤ群８を所望の大きさの電
流で駆動することができる。Therefore, the LED connected to the collector of ']'lt7
As shown in the group 8 (characteristic curve in Figure 3 regardless of the magnitude of the power supply voltage E applied to the d positive power supply terminal 3), the LEDs are driven with a nearly constant current, so the current to be supplied to the LED group 8 is By setting the value of the resistor 6 according to the value, the LED group 8 can be driven with a current of a desired magnitude regardless of changes or fluctuations in the power supply voltage.
一！た上述した実施例においては、ＰＮＰ型のトランジ
スタを用いているが第４図に示すようにＮＰＮ型のトラ
ンジスタを用いた場合においても上述した実施例と同様
に電源電圧Ｅの変動にかかわらず、ＬＥＤ）群８−２を
定電流駆動することができる。one! In the embodiment described above, a PNP type transistor is used, but as shown in FIG. The LED group 8-2 can be driven with a constant current.
丑だ、第５図に示すように、抵抗１４−３の一端を接地
ライン１１から外し、この一端を’Ｉ’ Ｉｔ ７のコ
レクタに接続するｔうに１〜でも、−上述した各実施例
と同様の効果を得ることができる。しかもこの場合、正
電源端子３を介して供給される電流を全てＬ ＥＤ群８
に供給することかで・きるから、回路の電力効率を」二
げることができる。またこの場合、定電流回路５−３の
端子数を２つにすることができるから、この定電流回路
５をセラミック基板などに予め作っておけば、端子が１
つ減った分だけこの駆動回路の組み立て作業を簡素化す
ることができる。However, as shown in FIG. 5, one end of the resistor 14-3 is disconnected from the ground line 11 and this one end is connected to the collector of 'I' It 7. A similar effect can be obtained. Moreover, in this case, all the current supplied through the positive power supply terminal 3 is connected to the LED group 8.
The power efficiency of the circuit can be increased by supplying more power to the circuit. Furthermore, in this case, the number of terminals of the constant current circuit 5-3 can be reduced to two, so if the constant current circuit 5 is made in advance on a ceramic substrate or the like, the number of terminals can be reduced to one.
The assembly work of this drive circuit can be simplified by the reduction in number of parts.
また上述した各実施例においては、ＬＥＤ群８のＬ Ｅ
Ｄ ９を複数個直列にしているが、第６図に示すよう
にこれらのＪ、 Ｅ Ｄ ９を所定個数単位で並列に接
続するようにしても良い。なおこの場合の電圧電流特性
は第３図の←）に示すものとなる。Further, in each of the embodiments described above, L E of the LED group 8
Although a plurality of D9s are connected in series, these J and ED9s may be connected in parallel in a predetermined number as shown in FIG. Note that the voltage-current characteristics in this case are as shown in ←) in FIG.
第７図（イ）は」二連した］、 ＥＤランプの駆動回路
を適用したＪ、 Ｅ Ｄランプ装置の一例を示す平面図
である。この図において、２０は複数のＬ ＥＤが設け
られた］、 ＥＤヘッドであり、この１． ＥＤヘッド
２０の後端（図において右側の端部）には第７図（ロ）
の側面図に示すようにＬ Ｅ Ｄ駆動部２１が設けられ
ている。］、 ＥＩ）駆動部２１は正電源端子３と。FIG. 7(a) is a plan view showing an example of an ED lamp device to which a double ED lamp drive circuit is applied. In this figure, 20 is an ED head provided with a plurality of LEDs; At the rear end of the ED head 20 (the right end in the figure) there is a
As shown in the side view, an LED drive section 21 is provided. ], EI) The drive section 21 is connected to the positive power supply terminal 3.
接地端子１０と、これらの正電源端子３と接地端子】０
とに接続される基板（例えばセラミック基板）２２とか
ら構成されるものであり、第７図（ハ）の断面図に示す
ようにこの基板２２上にある定電流回路５の出力端子５
１〕から延びる線２３ ａおよび前記定電流回路５の接
地ライン１１から延びる線２３＋）は前記Ｊ、 Ｌ：
Ｄヘッド２００発光部２４に接続され、かつこの基板２
２の後端は支持ブロック２５に接続されている。The ground terminal 10, these positive power supply terminals 3 and the ground terminal】0
and a substrate (for example, a ceramic substrate) 22, which is connected to the output terminal 5 of the constant current circuit 5 on this substrate 22, as shown in the cross-sectional view of FIG. 7(c).
1] and the line 23+) extending from the ground line 11 of the constant current circuit 5 are the J, L:
The D head 200 is connected to the light emitting section 24, and this substrate 2
The rear end of 2 is connected to a support block 25.
しかして、とのＬ Ｅ Ｄランプ装置をランプソケット
（図示路）に挿入１７てこのランプソケットの各電極と
正電源端子３、接地端子１０とを各々接続すれば、この
ランプソケット側の電源電圧の大小にかかわらずＬＥｒ
）板２４上にあるＬＥＤ９ 。Therefore, by inserting the LED lamp device into the lamp socket (as shown in the diagram) and connecting each electrode of the lamp socket with the lever 17 to the positive power supply terminal 3 and the ground terminal 10, the power supply voltage on this lamp socket side will be reduced. LEr regardless of the size of
) LED 9 on board 24.
９、・・・を一定電流で駆動することができる。9, . . . can be driven with a constant current.
また、本発明はこのような棒状タイプのＬ Ｅ］）ラン
プ装置以外の装置１例えば第８図の側面図に示すような
電球タイプのＪ、 ＥＴ）ランプ装置にも適用すること
ができる。なおこの場合、正電源端子（圧電り３に正電
圧を印加し、かつ接地端子（口金）１０を接地すれば、
この口金１０内にある本願に係る定電流回路基板３０が
前記正電圧から定電流を生成してＬ ＥＤヘッド３１に
供給する。Furthermore, the present invention can be applied to devices other than such rod-shaped lamp devices, such as electric light bulb-type lamp devices such as the one shown in the side view of FIG. In this case, if a positive voltage is applied to the positive power supply terminal (piezoelectricity 3) and the ground terminal (base) 10 is grounded,
A constant current circuit board 30 according to the present invention in the base 10 generates a constant current from the positive voltage and supplies it to the LED head 31.
またこれらの］、 ＥＤランプ装置以装置上のに本願を
適用する３Ｌうにしても良い。Furthermore, the present invention may be applied to an ED lamp device or above.
以上説明したように本発明によるＬ Ｅ Ｄランプの駆
動回路は、電源電圧から予め設定されている値の電流を
生成してＬ Ｅ Ｄを駆動するようにしたので、電源電
圧が変更された場合においても、寸たこの電源電圧が変
動Ｉ−た場合においてもＳ ＪＪ ＥＤの輝度を一定に
することができるとともに、とのＬ ＥＤが過負荷駆動
されるのを防止することができ、その寿命を延すこ七が
できる。また、電源電圧を考慮する必要がないから、複
数の電源電圧に対しても同一の回路を使用することがで
き、その生産性および凡用性を向上させることができる
とともに、そのコストを下げることができる。As explained above, the LED lamp drive circuit according to the present invention drives the LED by generating a current of a preset value from the power supply voltage, so that even if the power supply voltage is changed, Even when the power supply voltage fluctuates, the brightness of the SJJ ED can be kept constant, and the LED can be prevented from being overloaded and its lifespan can be extended. It is possible to extend this. In addition, since there is no need to consider the power supply voltage, the same circuit can be used for multiple power supply voltages, improving productivity and versatility, and reducing costs. I can do it.
回路の第１実施例を示す回路図、第３図は同実施例の電
圧−電流特性を示す特性図、第４図は本発明の第２実施
例を示す回路図、第５図は本発明の第３実施例を示す回
路図、第６図は本発明の第４実施例を示す回路図、第７
図（イ）はこの発明によるＬ ＥＤランプの駆動回路を
適用したＬＥＤランプ装置の一例を示す平面図、第７図
０７）は第７図げ）に示すＬ ＥＤランプ装置の側面図
、第７図（ハ）は第７図（イ）のＡ−Ａ線における断面
図、第８図はこの発明によるＬＥＤランプの駆動回路を
適用したＬＥＤランプ装置の他の例を示す側面図である
。
３・・・正電源端子、４・・・保護ダイオード、５・・
・定電流回路、６・・・抵抗、７・・・トランジスタ、
８・・・ＬＥＤ群、９・・・ＬＥＤ、１０−・・接地端
子、１２・・・検出回路、１３・・・トランジスタ。
特許出願人 日本デンヨー株式会社
代理人弁理士 西 利 教 光
第１図
第２図
第３図
第４図
第５図
第６図
−４
第７図（イ）
４
第７図（ロ）
第７図（ハ） （Ａ−Ａａ）
第８図
Ｆｍｌ■A circuit diagram showing the first embodiment of the circuit, FIG. 3 is a characteristic diagram showing the voltage-current characteristics of the same embodiment, FIG. 4 is a circuit diagram showing the second embodiment of the present invention, and FIG. 5 is a diagram showing the voltage-current characteristics of the same embodiment. FIG. 6 is a circuit diagram showing the fourth embodiment of the present invention, and FIG. 7 is a circuit diagram showing the fourth embodiment of the present invention.
Figure (a) is a plan view showing an example of an LED lamp device to which the LED lamp drive circuit according to the present invention is applied; Figure (C) is a cross-sectional view taken along the line A--A in Figure 7 (A), and Figure 8 is a side view showing another example of an LED lamp device to which the LED lamp drive circuit according to the present invention is applied. 3... Positive power supply terminal, 4... Protection diode, 5...
・Constant current circuit, 6...Resistor, 7...Transistor,
8... LED group, 9... LED, 10-... ground terminal, 12... detection circuit, 13... transistor. Patent Applicant Nihon Denyo Co., Ltd. Patent Attorney Noriyori Nishi Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6-4 Figure 7 (A) 4 Figure 7 (B) Figure 7 Figure (c) (A-Aa) Figure 8 Fml■
Claims (1)
Ｅ Ｄを駆動するＬ Ｅ Ｄランプの駆動回路におい
て、前記電源入力端子に印加された電源電圧から予め設
定されている値の電流を生成するとともに、この電流を
前記Ｌ Ｅ Ｄに供給してとの１ＪＥＤを駆動する定電
流回路を具備１〜たことを特徴とするＬＥＤランプの駆
動回路。Converts the power supply voltage applied to the power supply input terminal into current and
In an LED lamp driving circuit that drives an LED, a current having a preset value is generated from the power supply voltage applied to the power input terminal, and this current is supplied to the LED. 1. A driving circuit for an LED lamp, comprising: a constant current circuit for driving a JED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58161921A JPS6054483A (en) | 1983-09-05 | 1983-09-05 | Drive circuit of led lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58161921A JPS6054483A (en) | 1983-09-05 | 1983-09-05 | Drive circuit of led lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6054483A true JPS6054483A (en) | 1985-03-28 |
Family
ID=15744558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58161921A Pending JPS6054483A (en) | 1983-09-05 | 1983-09-05 | Drive circuit of led lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6054483A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001045470A1 (en) * | 1999-12-14 | 2001-06-21 | Takion Co., Ltd. | Power supply and led lamp device |
| JP2002153066A (en) * | 2000-09-01 | 2002-05-24 | Idec Izumi Corp | Ac drive circuit |
| KR20050045748A (en) * | 2003-11-12 | 2005-05-17 | (주)크레스라이트 | Constant current circuit for light emitting diode |
| CN101883460A (en) * | 2009-05-04 | 2010-11-10 | 奥斯兰姆有限公司 | Low dropout (ldo) current regulator |
-
1983
- 1983-09-05 JP JP58161921A patent/JPS6054483A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001045470A1 (en) * | 1999-12-14 | 2001-06-21 | Takion Co., Ltd. | Power supply and led lamp device |
| US6577072B2 (en) | 1999-12-14 | 2003-06-10 | Takion Co., Ltd. | Power supply and LED lamp device |
| JP4353667B2 (en) * | 1999-12-14 | 2009-10-28 | 株式会社タキオン | LED lamp device |
| JP2002153066A (en) * | 2000-09-01 | 2002-05-24 | Idec Izumi Corp | Ac drive circuit |
| KR20050045748A (en) * | 2003-11-12 | 2005-05-17 | (주)크레스라이트 | Constant current circuit for light emitting diode |
| CN101883460A (en) * | 2009-05-04 | 2010-11-10 | 奥斯兰姆有限公司 | Low dropout (ldo) current regulator |
| EP2249623A1 (en) * | 2009-05-04 | 2010-11-10 | Osram Gesellschaft mit Beschränkter Haftung | A low-dropout (LDO) current regulator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4199202B2 (en) | Power supply device and lighting device | |
| US7462994B2 (en) | LED illumination apparatus | |
| JP2008103470A (en) | Led (light emitting diode) driving circuit | |
| JP2003100472A (en) | Driving equipment for light emitting diode | |
| JP2005197304A (en) | Light emitting device | |
| US20050286244A1 (en) | Shoe lamp device with multiple voltage levels | |
| JP2011108799A (en) | Light emitting device, and lighting system and display device equipped with light emitting device | |
| US9538593B2 (en) | Method for multiplying current of LED light bar and associated driving circuit thereof | |
| JPS6054483A (en) | Drive circuit of led lamp | |
| CN109155344B (en) | Light emitting device and lighting device | |
| US8749165B2 (en) | Light source driving device including a switching current adjustment circuit | |
| JP2007053151A (en) | Driving circuit for light emitting diode and its manufacturing method | |
| JP2004207654A (en) | Illuminator and driver circuit for illumination | |
| JP7097049B2 (en) | Light emitting diode drive circuit | |
| JP2001045747A (en) | Lighting circuit for light emitting diode | |
| JP2010003810A (en) | Light-emitting diode-driving circuit | |
| CN218064455U (en) | Dazzle various LED flexible filament and bulb | |
| JP2014179451A (en) | Light emission device | |
| JPH1012927A (en) | Led emitter with voltage control lead | |
| JP2005116379A (en) | Led unit for flashlight | |
| JPH0323612Y2 (en) | ||
| WO2020237427A1 (en) | Led soft light strip circuit with which brightness and color temperature are adjusted simultaneously and soft light strip | |
| JPH06209123A (en) | Light emitting diode switch driving circuit | |
| CN107426854B (en) | The drive system and driving method of plane Organnic electroluminescent device | |
| WO2012020606A1 (en) | Light-emitting diode drive circuit |