JPS5468184A - Light emission diode driving circuit - Google Patents

Light emission diode driving circuit

Info

Publication number
JPS5468184A
JPS5468184A JP13534777A JP13534777A JPS5468184A JP S5468184 A JPS5468184 A JP S5468184A JP 13534777 A JP13534777 A JP 13534777A JP 13534777 A JP13534777 A JP 13534777A JP S5468184 A JPS5468184 A JP S5468184A
Authority
JP
Japan
Prior art keywords
voltage
power source
circuit
base
driving circuit
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
JP13534777A
Other languages
Japanese (ja)
Other versions
JPS5915392B2 (en
Inventor
Yasuyuki Watanabe
Kazuyuki Ogata
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP52135347A priority Critical patent/JPS5915392B2/en
Publication of JPS5468184A publication Critical patent/JPS5468184A/en
Publication of JPS5915392B2 publication Critical patent/JPS5915392B2/en
Expired legal-status Critical Current

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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Abstract

PURPOSE:To obtain a normal relaxation oscillation and make an oscillation period fixed even if the voltage of the DC power source is fluctuated in a LED driving circiut. CONSTITUTION:Capacitor C is connected to DC power source Vc through constant current circuit CI, and swithing element S which is conductive in parallel to this capacitor C at a prescribed charging potential, LED D and resistance RI are connected in series, thereby constituting a LED driving circuit. Here, constant current circuit CI utilizes that the collector current of the transistor is determined by the voltage between the emitter and the base, and for example, even if the voltage of DC power source Vc rises to increase the base potential of transistor TR and the collector current will be increased, the voltage between the emitter and the base is held fixed by Zener diode ZD, and the collector current becomes fixed. Therefore, by selecting values of resistances R2, R3 and R4, this circuit can be so designed that the current may be constant against the voltage fluctuation of DC power source Vc.
JP52135347A 1977-11-10 1977-11-10 Light emitting diode drive circuit Expired JPS5915392B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52135347A JPS5915392B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52135347A JPS5915392B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Publications (2)

Publication Number Publication Date
JPS5468184A true JPS5468184A (en) 1979-06-01
JPS5915392B2 JPS5915392B2 (en) 1984-04-09

Family

ID=15149638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52135347A Expired JPS5915392B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Country Status (1)

Country Link
JP (1) JPS5915392B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007150003A (en) * 2005-11-29 2007-06-14 Fuji Electric Device Technology Co Ltd Insulated signal transmission circuit
WO2007144365A1 (en) * 2006-06-15 2007-12-21 Osram Gesellschaft mit beschränkter Haftung Electrical power supply circuit device for at least one electrical and/or electronic component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007150003A (en) * 2005-11-29 2007-06-14 Fuji Electric Device Technology Co Ltd Insulated signal transmission circuit
WO2007144365A1 (en) * 2006-06-15 2007-12-21 Osram Gesellschaft mit beschränkter Haftung Electrical power supply circuit device for at least one electrical and/or electronic component

Also Published As

Publication number Publication date
JPS5915392B2 (en) 1984-04-09

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