JPS55143079A - Luminous source device with light emitting element - Google Patents

Luminous source device with light emitting element

Info

Publication number
JPS55143079A
JPS55143079A JP5190079A JP5190079A JPS55143079A JP S55143079 A JPS55143079 A JP S55143079A JP 5190079 A JP5190079 A JP 5190079A JP 5190079 A JP5190079 A JP 5190079A JP S55143079 A JPS55143079 A JP S55143079A
Authority
JP
Japan
Prior art keywords
led
resister
voltage
parallel
input
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
Application number
JP5190079A
Other languages
Japanese (ja)
Inventor
Hideki Fukusono
Toshiro Abe
Yukio Iitaka
Yoshihisa Ishigami
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP5190079A priority Critical patent/JPS55143079A/en
Publication of JPS55143079A publication Critical patent/JPS55143079A/en
Pending 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
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • 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)

Abstract

PURPOSE:To protect an LED for an excessive input voltage by connecting a resister in series and parallel to an LED, by connecting a resister in parallel to a series circuit of an LED and a resister, and by protecting an LED against an excessive input voltage. CONSTITUTION:Resisters 6 and 7 are connected to an LED 1 in series and parallel and a Zener diode 8 is connected in parallel to the series circuit of the LED 1 and the resister 6 as a protective resistance. When a direct current input source voltage V is small, a certain amount of current is shunted at a resister 8 and the LED does not emit light, but it emits light for the input exceeding the prescribed voltage. Even when the input exceeded the Zener voltage V2, the voltage is excess of V2 is not applied to the LED. Also, when the power source is connected reversely, the LED is short-circuited by the Zener diode. Hence, a luminous source device without the deterioration and the breakdown of LED can be obtained.
JP5190079A 1979-04-26 1979-04-26 Luminous source device with light emitting element Pending JPS55143079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5190079A JPS55143079A (en) 1979-04-26 1979-04-26 Luminous source device with light emitting element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5190079A JPS55143079A (en) 1979-04-26 1979-04-26 Luminous source device with light emitting element

Publications (1)

Publication Number Publication Date
JPS55143079A true JPS55143079A (en) 1980-11-08

Family

ID=12899742

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5190079A Pending JPS55143079A (en) 1979-04-26 1979-04-26 Luminous source device with light emitting element

Country Status (1)

Country Link
JP (1) JPS55143079A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161157A (en) * 1982-03-19 1983-09-24 Hitachi Ltd Driving device of semiconductor laser
JP2001308375A (en) * 2000-04-24 2001-11-02 Nippon Sheet Glass Co Ltd Light-emitting element and light-emitting element array
JP2007273691A (en) * 2006-03-31 2007-10-18 Casio Comput Co Ltd Drive and method of driving light-emitting element, and projector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161157A (en) * 1982-03-19 1983-09-24 Hitachi Ltd Driving device of semiconductor laser
JP2001308375A (en) * 2000-04-24 2001-11-02 Nippon Sheet Glass Co Ltd Light-emitting element and light-emitting element array
JP2007273691A (en) * 2006-03-31 2007-10-18 Casio Comput Co Ltd Drive and method of driving light-emitting element, and projector
JP4595869B2 (en) * 2006-03-31 2010-12-08 カシオ計算機株式会社 Light emitting element driving apparatus, light emitting element driving method, and projector

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