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WO2008038984A1 - ENSEMBLE DE DELs - Google Patents

ENSEMBLE DE DELs Download PDF

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Publication number
WO2008038984A1
WO2008038984A1 PCT/KR2007/004682 KR2007004682W WO2008038984A1 WO 2008038984 A1 WO2008038984 A1 WO 2008038984A1 KR 2007004682 W KR2007004682 W KR 2007004682W WO 2008038984 A1 WO2008038984 A1 WO 2008038984A1
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
emitting diode
emitting diodes
diode assembly
operate
Prior art date
Application number
PCT/KR2007/004682
Other languages
English (en)
Inventor
Sung Ho Hong
Jung Yun Kim
Original Assignee
Seoul Semiconductor Co., 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 Seoul Semiconductor Co., Ltd. filed Critical Seoul Semiconductor Co., Ltd.
Publication of WO2008038984A1 publication Critical patent/WO2008038984A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • 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]
    • H05B45/40—Details of LED load circuits
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs

Definitions

  • the present invention relates to a light emitting diode assembly, and more particularly, to a light emitting diode assembly using a transistor.
  • a light emitting diode refers to a device which generates minority carriers
  • a light emitting device using such a light emitting diode is superior in terms of power saving and durability since it has less electric power consumption and a longer life span of several to several ten times as compared an existing electric light bulb or a fluorescent lamp.
  • a light emitting diode assembly having a plurality of light emitting diodes is used conventionally.
  • the conventional light emitting diode assembly includes a plurality of light emitting diodes, which are serially connected to one another.
  • the present invention is conceived to solve the aforementioned problems in the prior art.
  • An object of the present invention is to provide a light emitting diode assembly where even when any one of a plurality of light emitting diodes serially connected with one another does not operate, the others can operate normally.
  • a light emitting diode assembly comprising a plurality of light emitting diodes serially connected to each other; a switching unit connected to a circuit including the plurality of light emitting diodes; a measuring unit for measuring whether or not each of the plurality of light emitting diodes operate; and a controller for determining whether or not each of the plurality of light emitting diodes operate from the measuring unit and for operating the switching unit.
  • the switching unit may include transistors respectively connected to the plurality of light emitting diodes, and the respective transistors are configured so as to bypass current applied to the responding light emitting diodes when the responding emitting diodes do not operate.
  • the controller may include a microcomputer.
  • the light emitting diode assembly of the present invention may further inc lude an amplifier for amplifying a signal output from the controller.
  • the amplifier may include an operational amplifier.
  • the present invention can provide a light emitting diode assembly in which when any one of a plurality of light emitting diodes serially connected does not operate, the others can operate by bypassing the non-operating light emitting diode using a transistor.
  • FIG. 1 is a plan view of a light emitting diode assembly according to the present invention.
  • FIG. 2 is a circuit diagram of the light emitting diode assembly according to the present invention.
  • FIG. 1 is a plan view of a light emitting diode assembly according to the present invention
  • FIG. 2 is a circuit diagram of the light emitting diode assembly according to the present invention.
  • the light emitting diode assembly comprises a base plate 100, a plurality of light emitting diodes 200 mounted on the base plate 100, a switching unit 300, a measuring unit 400, and a controller 500.
  • the base plate 100 may be formed with an electrode pattern for applying external power to the light emitting diodes.
  • the base plate 100 is mounted with the plurality of light emitting diodes and is to apply external power to the plurality of light emitting diodes.
  • electrodes (not shown) are formed at predetermined positions of the base plate 100.
  • Such a base plate 100 may be a printed circuit board PCB for heat radiation of the plurality of light emitting diodes and for application of external power. That is, for example, when a metal core printed circuit board MCPCB is used as the printed circuit board, metal cores of the metal core printed circuit board are connected to the electrodes, so that the plurality of light emitting diodes 200 are electrically connected to the electrodes through the metal cores.
  • the plurality of light emitting diodes 200 which are light sources of the light emitting diode assembly of the present invention, have light emitting chips mounted therein. That is, the light emitting diode has a structure in which a light emitting chip is mounted to emit light by external power, for example, a structure in which a light emitting chip is mounted on a board, on which an electrode pattern is formed, to be electrically connected to the electrode pattern.
  • a light emitting chip generates minority carriers (electrons or holes) using a p-n junction structure of a semiconductor and emits light through recombination of the minority carriers.
  • the light emitting diode according to the present invention is not limited thereto, but may be constructed with a plurality of light emitting chips. That is, the light emitting chips may be mounted directly on the base plate 100 in stead of mounting the light emitting diodes thereon.
  • the light emitting chips may be mounted on the base plate 100, and the electrode pattern of the base plate 100 and the light emitting chips may be connected with each other using predetermined wires.
  • the light emitting diode can emit various colors according to the types of the light emitting chips and phosphors. In this embodiment, such light emitting diodes will be described by way of examples of 4 light emitting diodes, i.e., first to fourth diodes 200a to 20Od.
  • the present invention is not limited thereto, but the light emitting diode may be plural.
  • the switching unit 300 which is to bypass the power applied to non-operating one of the plurality of light emitting diodes 200, includes transistors in the present invention.
  • This embodiment includes first to fourth transistors 300a to 300d as the switching unit, and the first to fourth transistors 300a to 300d are connected to the first to fourth diodes 200a to 20Od, respectively. At this time, it is desired that the number of the transistors of the switching unit is identical to that of the light emitting diodes.
  • FIG. 1 shows that the switching unit 300 is mounted on the base plate 100, the present invention is not limited thereto.
  • the switching unit 300 may be mounted in the light emitting diode.
  • the measuring unit 400 which is to check current of the plurality of light emitting diodes 200 and the operational state thereof, includes a logic device. That is, the measuring unit 400 individually connected to each of the plurality of light emitting diodes 200 measures current values of each light emitting diodes to be measured, and checks the operational state of the light emitting diodes according to the measured current values. At this time, the measuring unit 400 is connected to the controller 500 to transfer information on the operational state of the light emitting diodes, i.e., an operational signal, thereto. Further, the measuring unit 400 is included in not the base plate 100 but the light emitting diodes like the switching unit 300.
  • the controller 500 which is to control the switching unit 300, includes a microcomputer in this embodiment. Such a controller 500 controls the switching unit 300 according to the operational state of the light emitting diodes according to the operational signal applied to the measuring unit 400.
  • the light emitting diode assembly of the present invention may further include an amplifier 600 for amplifying the signal applied to the switching unit 300 from the controller 500.
  • the amplifier 600 may include an operational amplifier (OPAMP).
  • the first to fourth light emitting diodes 200a to 20Od are respectively connected to the first to fourth transistors 300a to 300d, and the firth to fourth transistors 300a to 300d are respectively connected to the first to fourth measuring units 400a to 40Od (400). Further, the first to fourth measuring units 400a to 40Od (400) are connected to the controller 500, and the controller 500 is connected to the switching unit 300 through the amplifier 600. Accordingly, the first to fourth measuring units 400a to 40Od (400) continuously measure the operational states of the first to fourth light emitting diodes 200a to 20Od.
  • the controller 500 determines the non-operating light emitting diode by the measuring unit 400 connected to the non-operating light emitting diode, and bypasses the non- operating light emitting diode by turning on the transistor connected thereto.
  • the operational state of the second light emitting diode 200b is measured by the second measuring unit 400b connected thereto. Then, the operational signal of the second light emitting diode 200b is applied to the controller 500 connected to the second measuring unit 400b, and the controller 500 determines from the operational signal that the second light emitting diode 200b does not operate.
  • the controller 500 applies a signal to the second transistor 300b connected to both ends of the second light emitting diode 200b. Then, the second transistor 300b is turned on by the signal, so that the current applied to the second light emitting diode 200b is bypassed to the second transistor 300b. The current to be applied to the second light emitting diode 200b which does not operate is bypassed to the second transistor 300b, so that current is normally applied to the third and fourth light emitting diodes 200c and 20Od.
  • the present invention although there is non-operating one of the plurality of light emitting diodes, the non-operating light emitting diode is bypassed by means of the switching unit 300, so that the others can operate. Further, the present invention has the same effect that the plurality of light emitting diodes 200 are connected in parallel, and at the same time, has an advantage of serial connection, i.e., uniform luminance of the plurality of light emitting diodes due to uniform current applied thereto.
  • the present invention is not limited thereto but can be applied to a light emitting diode assembly for an automobile head light which requires uniform luminance. That is, in a case where the present invention is applied to the light emitting diode assembly for an automobile head light which is equipped with has a plurality of light emitting diodes, the light emitting diode assembly for an automobile head light can be prevented from not operating even though any one of the plurality of light emitting diodes does not operate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Led Devices (AREA)

Abstract

L'invention porte sur un ensemble de DELs et en particulier sur un tel ensemble comprenant un transistor, et dans lequel, au cas où l'une des DELs montées en série ne fonctionne pas, les autres peuvent fonctionner en contournant la DEL défectueuse à l'aide du transistor.
PCT/KR2007/004682 2006-09-29 2007-09-21 ENSEMBLE DE DELs WO2008038984A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0096263 2006-09-29
KR20060096263 2006-09-29

Publications (1)

Publication Number Publication Date
WO2008038984A1 true WO2008038984A1 (fr) 2008-04-03

Family

ID=39230366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/004682 WO2008038984A1 (fr) 2006-09-29 2007-09-21 ENSEMBLE DE DELs

Country Status (1)

Country Link
WO (1) WO2008038984A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081709A1 (it) * 2008-09-26 2010-03-27 St Microelectronics Srl Circuito di pilotaggio di una serie di diodi ad emissione di luce
WO2010046806A1 (fr) 2008-10-20 2010-04-29 Philips Intellectual Property & Standards Gmbh Lumière led

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990084247A (ko) * 1998-05-02 1999-12-06 이종규 교류전원 엘이디 구동회로
JP2005310998A (ja) * 2004-04-20 2005-11-04 Sony Corp 定電流駆動装置、バックライト光源装置及びカラー液晶表示装置
JP2006147360A (ja) * 2004-11-19 2006-06-08 Mitsubishi Electric Corp Ｌｅｄ点灯装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990084247A (ko) * 1998-05-02 1999-12-06 이종규 교류전원 엘이디 구동회로
JP2005310998A (ja) * 2004-04-20 2005-11-04 Sony Corp 定電流駆動装置、バックライト光源装置及びカラー液晶表示装置
JP2006147360A (ja) * 2004-11-19 2006-06-08 Mitsubishi Electric Corp Ｌｅｄ点灯装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081709A1 (it) * 2008-09-26 2010-03-27 St Microelectronics Srl Circuito di pilotaggio di una serie di diodi ad emissione di luce
WO2010046806A1 (fr) 2008-10-20 2010-04-29 Philips Intellectual Property & Standards Gmbh Lumière led
CN102186697A (zh) * 2008-10-20 2011-09-14 皇家飞利浦电子股份有限公司 Led灯
CN105539271A (zh) * 2008-10-20 2016-05-04 皇家飞利浦电子股份有限公司 Led灯
US9481293B2 (en) 2008-10-20 2016-11-01 Koninklijke Philips N.V. LED light

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