EP2246615A1 - LED-Leuchte und Wärmeableitungsverfahren dafür - Google Patents

LED-Leuchte und Wärmeableitungsverfahren dafür Download PDF

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Publication number
EP2246615A1
EP2246615A1 EP09159192A EP09159192A EP2246615A1 EP 2246615 A1 EP2246615 A1 EP 2246615A1 EP 09159192 A EP09159192 A EP 09159192A EP 09159192 A EP09159192 A EP 09159192A EP 2246615 A1 EP2246615 A1 EP 2246615A1
Authority
EP
European Patent Office
Prior art keywords
fan
heat
working temperature
light emitting
temperature
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.)
Withdrawn
Application number
EP09159192A
Other languages
English (en)
French (fr)
Inventor
Chih-Ming Lai
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.)
Foxsemicon Integrated Technology Inc
Original Assignee
Foxsemicon Integrated Technology Inc
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 Foxsemicon Integrated Technology Inc filed Critical Foxsemicon Integrated Technology Inc
Priority to EP09159192A priority Critical patent/EP2246615A1/de
Publication of EP2246615A1 publication Critical patent/EP2246615A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to illuminators and, particularly, to a light emitting diode (LED) illuminator and a heat-dissipating method thereof.
  • LED light emitting diode
  • LEDs light emitting diodes
  • LEDs have been widely used in the field of illumination due to its high brightness, long lifespan, wide color gamut and so on.
  • LEDs generally emit visible light at specific wavelengths and generate a significant amount of heat.
  • approximately 80-90% of the electric energy consumed by the LEDs is converted to heat, with the remainder of the electric energy converted to light. If the generated heat cannot be timely dissipated, the LEDs may overheat, and thus the performance and lifespan maybe significantly reduced.
  • heat-dissipating apparatuses are applied in the illuminators to timely dissipate heat generated by the LEDs.
  • the heat-dissipating apparatus includes a fan to induce an airflow for the purpose of cooling the LEDs and a number of fins.
  • dust and suspending particles may exist in the surroundings of the illuminators. These dust and suspending particles may negatively impact and affect the working efficiency and lifespan of the fin of the heat-dissipating apparatus, thereby shortening the lifespan of the illuminators.
  • An exemplary embodiment of a heat-dissipating method of a light emitting diode illuminator includes the following steps.
  • the light emitting diode illuminator is provided and includes a light emitting diode, a fan apparatus, a temperature sensor and a controller.
  • the controller is electrically connected with the fan and the temperature sensor.
  • the fan is controlled by the controller to work at various speeds.
  • a working temperature of the light emitting diode is sensed using the temperature sensor, and a signal of the working temperature is transmitted from the temperature sensor to the controller.
  • the working temperature sensed by the temperature sensor is compared with a predetermined working temperature in the controller, and the fan is controlled by the controller to work at a suitable speed according to the comparison result between the working temperature and the predetermined working temperature.
  • FIG. 1 is a schematic, isometric view of a light emitting diode illuminator according to an exemplary embodiment.
  • FIG. 2 is a flowchart of a heat-dissipating method of the light emitting diode illuminator of FIG. 1 .
  • FIG. 3 is a logical view of a heat-dissipating process of the light emitting diode illuminator of FIG. 1 .
  • the LED illuminator 100 includes at least a LED 110, a heat-dissipating apparatus 120, a temperature sensor 130, and a controller 140.
  • the heat-dissipating apparatus 120 includes a heat-dissipating base 121, a heat sink 122 and a fan 123.
  • the heat-dissipating base 121 includes a first surface 121 a and a second surface 121 b on an opposite side of the first surface 121a.
  • the LED 110 is defined on the first surface 121a of the heat-dissipating base 121.
  • the heat sink 122 is thermally coupled with the second surface 121b of the heat-dissipating base 121.
  • the fan 123 is coupled with the heat sink 122, and cooperates with the heat sink 122 to dissipate heat generated from the LED 110.
  • the temperature sensor 130 can be thermally coupled with the heat-dissipating base 121 or the heat sink 122 to detect their temperatures, thereby evaluating or measuring a working temperature of the LED 110.
  • the temperature sensor 130 is coupled with to the heat-dissipating base 121 to detect a temperature of the heat-dissipating base 121, thereby evaluating or measuring the working temperature of the LED 110.
  • the controller 140 is electrically connected to the fan 123 and the temperature sensor 130.
  • the controller 140 includes a predetermined temperature and various speeds. At the predetermined temperature, the LED 110 cannot overheat and works normally.
  • the temperature sensor 130 senses the working temperature of the LED 110 and transmits signals of the working temperature to the controller 140.
  • the controller 140 compares the working temperature with the predetermined working temperature, and adjusts the speed of the fan 123 according to the comparison result. Therefore, the controller 140 has functions of activating the fan 123, stopping the fan 123 and adjusting the fan 123 to work at a suitable speed.
  • the fan 123 can be controlled by the controller 140 to work at various speeds. In the present embodiment, the fan 123 has two speeds, that is, a first speed (V1) and a second speed (V2) faster than the first speed.
  • an exemplary embodiment of a heat-dissipating method of the LED illuminator 100 includes: step 210, defining a predetermined working temperature of the LEDs 110 in the controller 140; step 220, sensing a working temperature of the LEDs 110 using the temperature sensor 130 and transmitting a signal of the working temperature to the controller 140; step 230, comparing the working temperature sensed by the temperature sensor 130 with the predetermined working temperature and adjusting the fan 123 to work at a suitable speed using the controller 140 according to the comparison result.
  • a predetermined working temperature (or a temperature range) of the LED 110 is defined in the controller 140 according to a working status of the LED illuminator 100.
  • the LEDs 110 are blue LEDs. About 40% of the electric energy of the LED 110 is converted to light, that is, about 60% electric energy is converted into heat energy.
  • the temperature of the LED along with the temperature of the surrounding environment of the LEDs 110 i.e., the working temperature
  • the LEDs 110 normally works at a temperature below 120 degrees Celsius.
  • the predetermined working temperature is set to be 70 degrees Celsius.
  • the working temperature of the LEDs 110 is difficult to be measured directly, so the predetermined working temperature and the working temperature below are acquired by measuring the temperature of the heat-dissipating base 121. That is, the predetermined working temperature and the working temperature below of the heat-dissipating base 121 are employed as the predetermined working temperature and the working temperature of the LEDs 110.
  • the temperature sensor 130 senses the working temperature of the LED 110, and transmits a signal of the working temperature to the controller 140. Specifically, during the working process of the LED illuminator 100, the temperature sensor 130 periodically senses the working temperature of the heat-dissipating base 121 nonstop, and transmits the signal of the working temperature to the controller 140.
  • a general step 230 the working temperature sensed by the temperature sensor 130 is compared with the predetermined working temperature using the controller 140, and the fan 123 is adjusted by the controller 140 to work at a suitable speed according to the comparison result.
  • the LEDs 110 generate a small amount of heat and the working temperature (T) of the LEDs 110 has not reach the predetermined working temperature value, i.e., 70 degrees Celsius. Under this condition, the fan 123 is in an "off" state.
  • the fan 123 When the working temperature value of the heat-dissipating base 121 sensed by the temperature sensor 130 is higher than 70 degrees Celsius, the fan 123 is activated and adjusted to work at the first speed (V1) by the controller 140. After a first period of time (t1), the working temperature of the heat-dissipating base 121 is sensed again by the temperature sensor 130, if the working temperature of the heat-dissipating base 121 is lower than 70 degrees Celsius, the fan 123 is controlled by the controller 140 to stop working, i.e., the fan 123 is in the "off" state.
  • the controller 140 adjusts the fan 123 to work at the second speed (V2). Because the second speed is faster than the first speed, the airflow of the fan 123 flows more quickly than the first speed.
  • the working temperature of the heat-dissipating base 121 is sensed again by the temperature sensor 120, if the working temperature of the heat-dissipating base 121 is lower than 70 degrees Celsius, the fan 123 is controlled by the controller 140 to stop working or to work at the first speed.
  • the fan 123 continuously works at the second speed until the working temperature is lower than 70 degrees Celsius. It is understood that three or more speeds can be defined in the controller 140 to adjust the fan 123 to works at three or more speeds, thereby accommodating the heat-dissipating requirement of the LEDs 110.
  • the working temperature of the LEDs 110 is sensed periodically by the temperature sensor 130, and is compared with the predetermined working temperature of the LEDs 110 by the controller 140. According to the comparison result, the fan 123 is adjusted by the controller 140 to work at a suitable speed, for example, stops working, works at the first speed, works at the second speed. That is, the working speed of the fan 123 can be adjusted according to the quantity of the heat to be dissipated of the LEDs 110, thereby avoiding the fan 123 continuously working at a high speed. Therefore, the present heat-dissipating method prevents the LEDs 110 from overheating, simultaneously saves the energy of the fan 123 and extends the service lifetime of the fan 123. Accordingly, the service lifetime of the illuminator is extended.
EP09159192A 2009-04-30 2009-04-30 LED-Leuchte und Wärmeableitungsverfahren dafür Withdrawn EP2246615A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09159192A EP2246615A1 (de) 2009-04-30 2009-04-30 LED-Leuchte und Wärmeableitungsverfahren dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09159192A EP2246615A1 (de) 2009-04-30 2009-04-30 LED-Leuchte und Wärmeableitungsverfahren dafür

Publications (1)

Publication Number Publication Date
EP2246615A1 true EP2246615A1 (de) 2010-11-03

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Family Applications (1)

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EP09159192A Withdrawn EP2246615A1 (de) 2009-04-30 2009-04-30 LED-Leuchte und Wärmeableitungsverfahren dafür

Country Status (1)

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EP (1) EP2246615A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047560A (zh) * 2012-11-29 2013-04-17 安徽冠宇光电科技有限公司 一种自动温控led灯具
US20140169004A1 (en) * 2011-09-27 2014-06-19 Toshiba Lighting & Technology Corporation Lamp Device and Luminaire
CN106090841A (zh) * 2016-07-28 2016-11-09 佛山市大吉大利科技有限公司 Led 节能照明灯管的自动降温方法及其灯管
CN106090670A (zh) * 2016-07-28 2016-11-09 佛山市大吉大利科技有限公司 一种具有自动降温的 led 节能照明灯管
CN107990159A (zh) * 2017-12-01 2018-05-04 黄久兰 一种高效散热的led灯

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1447710A1 (de) * 2003-02-13 2004-08-18 Noritsu Koki Co., Ltd. Vorrichtung zur Temperaturregelung von einer LED- Lichtquelle
US20050189554A1 (en) * 2002-05-29 2005-09-01 Optolum, Inc. Light emitting diode light source
JP2006147373A (ja) * 2004-11-19 2006-06-08 Sony Corp バックライト装置
WO2006119582A1 (en) * 2005-05-13 2006-11-16 Tama Berkeljon Lighting apparatus
US20070201232A1 (en) * 2006-02-27 2007-08-30 Kuei-Fang Chen Illumination apparatus having heat dissipating capability
WO2008099818A1 (ja) * 2007-02-13 2008-08-21 Daiwa Light Co., Ltd. Ｌｅｄ照明装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050189554A1 (en) * 2002-05-29 2005-09-01 Optolum, Inc. Light emitting diode light source
EP1447710A1 (de) * 2003-02-13 2004-08-18 Noritsu Koki Co., Ltd. Vorrichtung zur Temperaturregelung von einer LED- Lichtquelle
JP2006147373A (ja) * 2004-11-19 2006-06-08 Sony Corp バックライト装置
WO2006119582A1 (en) * 2005-05-13 2006-11-16 Tama Berkeljon Lighting apparatus
US20070201232A1 (en) * 2006-02-27 2007-08-30 Kuei-Fang Chen Illumination apparatus having heat dissipating capability
WO2008099818A1 (ja) * 2007-02-13 2008-08-21 Daiwa Light Co., Ltd. Ｌｅｄ照明装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140169004A1 (en) * 2011-09-27 2014-06-19 Toshiba Lighting & Technology Corporation Lamp Device and Luminaire
CN103047560A (zh) * 2012-11-29 2013-04-17 安徽冠宇光电科技有限公司 一种自动温控led灯具
CN106090841A (zh) * 2016-07-28 2016-11-09 佛山市大吉大利科技有限公司 Led 节能照明灯管的自动降温方法及其灯管
CN106090670A (zh) * 2016-07-28 2016-11-09 佛山市大吉大利科技有限公司 一种具有自动降温的 led 节能照明灯管
CN107990159A (zh) * 2017-12-01 2018-05-04 黄久兰 一种高效散热的led灯

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