JPS5587493A - Drive circuit for light emitting diode - Google Patents

Drive circuit for light emitting diode

Info

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
Application number
JP16296978A
Other languages
Japanese (ja)
Other versions
JPS5856271B2 (en
Inventor
Sadao Ifukuro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP53162969A priority Critical patent/JPS5856271B2/en
Publication of JPS5587493A publication Critical patent/JPS5587493A/en
Publication of JPS5856271B2 publication Critical patent/JPS5856271B2/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits

Landscapes

  • Led Devices (AREA)

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.
JP53162969A 1978-12-26 1978-12-26 Light emitting diode drive circuit Expired JPS5856271B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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