JPS5468185A - Light emission diode driving circuit - Google Patents

Light emission diode driving circuit

Info

Publication number
JPS5468185A
JPS5468185A JP13534877A JP13534877A JPS5468185A JP S5468185 A JPS5468185 A JP S5468185A JP 13534877 A JP13534877 A JP 13534877A JP 13534877 A JP13534877 A JP 13534877A JP S5468185 A JPS5468185 A JP S5468185A
Authority
JP
Japan
Prior art keywords
circuit
led
current
constant
light emission
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
JP13534877A
Other languages
Japanese (ja)
Other versions
JPS59139B2 (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 JP52135348A priority Critical patent/JPS59139B2/en
Publication of JPS5468185A publication Critical patent/JPS5468185A/en
Publication of JPS59139B2 publication Critical patent/JPS59139B2/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

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 make it possible to obtain a fixed-period relaxation oscillation to drive a LED normally even in case of the fluctuation of the power supply voltage and prevent power consumption from being wasted. CONSTITUTION:This circuit is constituted by a time constant circuit, where capacitor C is connected to DC power source Vc through constant current circuit CI, and a discharge circuit where a series circuit of swithihg element S, which is conductive at a prescribed potential, LED D and coil L is connected. Here, the current becomes constant against the voltage fluctuation of DC power source Vc because of constant current circuit CI; and when capacitor C is charged by the constant current to make switching element S conductive, the current is flown through the discharge circuit. By repeating this operation, a fixed-period relaxation oscillation is performed, and the LED is lit normally. Then, current IL flowing to LED D has a phase delayed more than current IR for no coil L interposed, and the light emission time of LED D is delayed by this phase delay and can accord to the response characteristic of the photo detector.
JP52135348A 1977-11-10 1977-11-10 Light emitting diode drive circuit Expired JPS59139B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52135348A JPS59139B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52135348A JPS59139B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Publications (2)

Publication Number Publication Date
JPS5468185A true JPS5468185A (en) 1979-06-01
JPS59139B2 JPS59139B2 (en) 1984-01-05

Family

ID=15149657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52135348A Expired JPS59139B2 (en) 1977-11-10 1977-11-10 Light emitting diode drive circuit

Country Status (1)

Country Link
JP (1) JPS59139B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020082701A1 (en) * 2018-10-26 2020-04-30 苏州菲达旭微电子有限公司 Half-voltage power supply ripple-free led circuit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60160843U (en) * 1984-04-02 1985-10-25 時田産業株式会社 Eye mask for light blocking
JPS60175252U (en) * 1984-04-27 1985-11-20 株式会社　かるね magnetic therapy equipment
JPS61118347U (en) * 1985-01-12 1986-07-25
JPS61253420A (en) * 1985-05-02 1986-11-11 Nippon Butsuri Tanko Kk Measurement of land subsidence using magnetic mat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020082701A1 (en) * 2018-10-26 2020-04-30 苏州菲达旭微电子有限公司 Half-voltage power supply ripple-free led circuit

Also Published As

Publication number Publication date
JPS59139B2 (en) 1984-01-05

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