JPS5587493A - Drive circuit for light emitting diode - Google Patents
Drive circuit for light emitting diodeInfo
- Publication number
- JPS5587493A JPS5587493A JP16296978A JP16296978A JPS5587493A JP S5587493 A JPS5587493 A JP S5587493A JP 16296978 A JP16296978 A JP 16296978A JP 16296978 A JP16296978 A JP 16296978A JP S5587493 A JPS5587493 A JP S5587493A
- Authority
- JP
- Japan
- Prior art keywords
- led
- series circuit
- current
- rise
- coil
- 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.)
- Granted
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
Abstract
PURPOSE:To improve the strain in the light output waveform of LED and reduce the rise and fall times by shortening the rise and fall time in the light emission of the LED by parallel connection of the series circuit comprising the coil and the resister to LED. CONSTITUTION:A series circuit comprising a coil 5 and a resister is connected in parallel to the LED 2. By the pulse signal applied to the input terminal, a drive transistor TR3 conducts and the current thereof diverges to the LED2 and the series circuit. The waveform of the current flowing through the series circuit is such that sudden change of the current is blocked at the rise and fall time depending on the inductance of the coil 5. On the other hand, the current to the LED2 is a subtraction of the current flowing through the series circuit from the current through the drive transistor 3. Accordingly, the strain in the light output waveform of the LED can be improved and thus, the rise and fall times can be reduced thereby allowing accurate following of the input signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53162969A JPS5856271B2 (en) | 1978-12-26 | 1978-12-26 | Light emitting diode drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53162969A JPS5856271B2 (en) | 1978-12-26 | 1978-12-26 | Light emitting diode drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5587493A true JPS5587493A (en) | 1980-07-02 |
| JPS5856271B2 JPS5856271B2 (en) | 1983-12-14 |
Family
ID=15764710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53162969A Expired JPS5856271B2 (en) | 1978-12-26 | 1978-12-26 | Light emitting diode drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5856271B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184673A2 (en) * | 1984-11-07 | 1986-06-18 | Sumitomo Electric Industries Limited | Optical transmitter with driving circuit |
| JPS645078A (en) * | 1987-06-27 | 1989-01-10 | Nec Corp | Led driving circuit |
| JPH01138766A (en) * | 1987-11-25 | 1989-05-31 | Nec Corp | Driving circuit for led |
| JP2016535443A (en) * | 2013-10-25 | 2016-11-10 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングＯｓｒａｍ Ｏｐｔｏ Ｓｅｍｉｃｏｎｄｕｃｔｏｒｓ ＧｍｂＨ | Circuit device, light emitting diode assembly, and optoelectronic component operating method |
-
1978
- 1978-12-26 JP JP53162969A patent/JPS5856271B2/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184673A2 (en) * | 1984-11-07 | 1986-06-18 | Sumitomo Electric Industries Limited | Optical transmitter with driving circuit |
| JPS645078A (en) * | 1987-06-27 | 1989-01-10 | Nec Corp | Led driving circuit |
| JPH01138766A (en) * | 1987-11-25 | 1989-05-31 | Nec Corp | Driving circuit for led |
| JP2016535443A (en) * | 2013-10-25 | 2016-11-10 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングＯｓｒａｍ Ｏｐｔｏ Ｓｅｍｉｃｏｎｄｕｃｔｏｒｓ ＧｍｂＨ | Circuit device, light emitting diode assembly, and optoelectronic component operating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5856271B2 (en) | 1983-12-14 |
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