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EP2571332A1 - LED illumination system - Google Patents

LED illumination system Download PDF

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Publication number
EP2571332A1
EP2571332A1 EP11181179A EP11181179A EP2571332A1 EP 2571332 A1 EP2571332 A1 EP 2571332A1 EP 11181179 A EP11181179 A EP 11181179A EP 11181179 A EP11181179 A EP 11181179A EP 2571332 A1 EP2571332 A1 EP 2571332A1
Authority
EP
European Patent Office
Prior art keywords
led illumination
illumination lamp
lamp sets
power supply
power
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Withdrawn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
EP11181179A
Other languages
German (de)
French (fr)
Inventor
Kuo-Hsin Huang
Chin-Pei Lin
Sheng-Hua Yang
Fang-Hsien Kuo
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.)
Excellence Opto Inc
Original Assignee
Excellence Opto 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 Excellence Opto Inc filed Critical Excellence Opto Inc
Priority to EP11181179A priority Critical patent/EP2571332A1/en
Publication of EP2571332A1 publication Critical patent/EP2571332A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F21V23/007—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing
    • F21V23/008—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing the casing being outside the housing of the lighting device
    • 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
    • F21V23/02—Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • F21V23/023—Power supplies in a casing
    • 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]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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 a light emitting diode (LED) and particularly to an LED illumination system.
  • LED light emitting diode
  • LED provides characteristics such as saving electric power, higher lighting efficiency and longer lifespan, thus has become a new generation of illumination element. It employs Epitaxy as a photoelectric element to generate light via electro luminescence transformation. Because the LED has many advantages, such as environment friendly, lower power consumption, higher efficiency and longer lifespan, it gradually replaces the traditional illumination equipments.
  • the LED has been widely adopted on various types of illumination apparatus.
  • the luminosity of a single LED still cannot match the conventional fluorescent lamp or halogen lamp.
  • multiple LEDs have to be clustered together.
  • the LED light bulbs on the market mostly have one power converter to mate an LED. Such a structure is more expensive and consumes more electric power, and also has a shorter lifespan.
  • FIG. I Please refer to FIG. I for a conventional LED illumination lamp set 1. It includes a plurality of LEDs 2 and a DC power supply 3 which receives commercial power and converts the commercial power into DC power to supply the LEDs 2. For multiple LED illumination lamp sets 1, multiple DC power supplies 3 also must be provided in a one-on-one fashion to meet use requirement.
  • the DC power supply 3 and the LEDs 2 are positioned close to each other, and heat generated by the DC power supply 3 would cause high temperature to affect lighting efficiency of the LEDs 2.
  • the DC power supply 3 is located in the LED illumination lamp set 1, and air circulation is undesirable that results in heat dissipation of the DC power supply 3 difficult.
  • the lifespan of the DC power supply 3 suffers, and in the event that the DC power supply 3 is damaged, replacement is also difficult.
  • the DC power supply 3 in the event that the DC power supply 3 is burnt out and on fire, as it is installed on a ceiling, instant alarm is not always possible, and the fire could also be spread to further result in even more serious danger, Furthermore, the DC power supply 3 usually is connected to the AC power source, users who try to replace the LEDs 2 could inadvertently suffer electric shock.
  • the primary object of the present invention is to provide an LED illumination system with a single DC power supply to provide electric power required by a plurality of LED illumination lamp sets to save cost and avert high temperature from affecting the lighting efficiency of the LED illumination lamp sets, and also avoid the hazard of electric shock during repair and maintenance of the LED illumination lamp sets.
  • the LED illumination system includes at least two LED illumination lamp sets, a DC power supply and at least two power circuits corresponding to the LED illumination lamp sets.
  • the DC power supply provides sufficient electric power for the LED illumination lamp sets, and is connected to the LED illumination lamp sets via the power circuits to reduce the number of the power supply needed and save cost.
  • the LED illumination lamp sets also are separated from the DC power supply so that the high temperature generated by the DC power supply does not affect the lighting efficiency of the LED illumination lamp sets, and the hazard of electric shock during repair and maintenance of the LED illumination lamp sets can also be avoided.
  • the present invention aims to provide an LED illumination system that includes at least two LED illumination lamp sets 10, a DC power supply 20 and at least two power circuits 30 corresponding to the LED illumination lamp sets 10.
  • Each LED illumination lamp set 10 includes a reflective lamp shell 11 and a plurality of LEDs 12 which can generate light after receiving voltage. The light generated by the LEDs 12 is then reflected by the reflective lamp shell 11 for illumination.
  • the DC power supply 20 provides sufficient electric power for the LED illumination lamp sets 10. However, the power supplied by the DC power supply 20 also can be adjusted according to the actual number of the LED illumination lamp sets 10.
  • the DC power supply 20 is connected to the LED illumination lamp sets 10 via the power circuits 30.
  • the LED illumination lamp sets 10 can be arranged according to requirements to meet illumination need, and are supplied at a required voltage by the power circuits 30.
  • the DC power supply 20 includes a transformer 21, an AC/DC converter 22 and a pulse width modulator (PWM in short hereinafter) 23.
  • the transformer 21 receives commercial power from an AC power source 40 and is connected to the AC/DC converter 22, which is then connected to the PWM 23, and the PWM 23 is further connected to the power circuits 30.
  • the PWM 23 and the power circuits 30 can be bridged by an adjustable resistor 24 and coupled with a capacitor 25 in parallel respectively.
  • the PWM 23 mainly includes a Bipolar Junction Transistor (BJT) 231, a base driver 232 and an operational amplifier (OP) 233.
  • the operational amplifier 233 sends a feedback incorporating with the base driver 232 and BJT 231 to generate pulse width modulation.
  • the transformer 21 and the AC power source 40 may also be bridged by a fuse 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

An LED illumination system includes a DC power supply (20), at least two LED illumination lamp sets (10) and at least two power circuits (30) corresponding to the LED illumination lamp sets (10). The DC power supply (20) provides sufficient electric power for the LED illumination lamp sets (10) and is connected to the LED illumination lamp sets (10) via the power circuits (30). The invention supplies electric power required by the LED illumination lamp sets (10) via a single DC power supply (20) without an extra DC power supply, hence the cost is lower. Moreover, the DC power supply (20) is located remote from the LED illumination lamp sets (10), hence high temperature generated by the DC power supply (20) does not affect lighting and lifespan of the LED illumination lamp sets (10). The hazard of electric shock by inadvertently touching the AC power source (40) while replacing lamps in the LED illumination lamp sets (10) can also be avoided to improve usability and safety.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a light emitting diode (LED) and particularly to an LED illumination system.
    • BACKGROUND OF THE INVENTION
  • LED provides characteristics such as saving electric power, higher lighting efficiency and longer lifespan, thus has become a new generation of illumination element. It employs Epitaxy as a photoelectric element to generate light via electro luminescence transformation. Because the LED has many advantages, such as environment friendly, lower power consumption, higher efficiency and longer lifespan, it gradually replaces the traditional illumination equipments.
  • At present the LED has been widely adopted on various types of illumination apparatus. However, for indoor illumination the luminosity of a single LED still cannot match the conventional fluorescent lamp or halogen lamp. In order to provide sufficient indoor illumination, multiple LEDs have to be clustered together. At present, the LED light bulbs on the market mostly have one power converter to mate an LED. Such a structure is more expensive and consumes more electric power, and also has a shorter lifespan.
  • Please refer to FIG. I for a conventional LED illumination lamp set 1. It includes a plurality of LEDs 2 and a DC power supply 3 which receives commercial power and converts the commercial power into DC power to supply the LEDs 2. For multiple LED illumination lamp sets 1, multiple DC power supplies 3 also must be provided in a one-on-one fashion to meet use requirement.
  • However, the DC power supply 3 and the LEDs 2 are positioned close to each other, and heat generated by the DC power supply 3 would cause high temperature to affect lighting efficiency of the LEDs 2. Moreover, the DC power supply 3 is located in the LED illumination lamp set 1, and air circulation is undesirable that results in heat dissipation of the DC power supply 3 difficult. Hence the lifespan of the DC power supply 3 suffers, and in the event that the DC power supply 3 is damaged, replacement is also difficult.
  • In addition, in the event that the DC power supply 3 is burnt out and on fire, as it is installed on a ceiling, instant alarm is not always possible, and the fire could also be spread to further result in even more serious danger, Furthermore, the DC power supply 3 usually is connected to the AC power source, users who try to replace the LEDs 2 could inadvertently suffer electric shock.
    • SUMMARY OF THE INVENTION
  • The primary object of the present invention is to provide an LED illumination system with a single DC power supply to provide electric power required by a plurality of LED illumination lamp sets to save cost and avert high temperature from affecting the lighting efficiency of the LED illumination lamp sets, and also avoid the hazard of electric shock during repair and maintenance of the LED illumination lamp sets.
  • To achieve the foregoing object, the LED illumination system according to the invention includes at least two LED illumination lamp sets, a DC power supply and at least two power circuits corresponding to the LED illumination lamp sets. The DC power supply provides sufficient electric power for the LED illumination lamp sets, and is connected to the LED illumination lamp sets via the power circuits to reduce the number of the power supply needed and save cost. The LED illumination lamp sets also are separated from the DC power supply so that the high temperature generated by the DC power supply does not affect the lighting efficiency of the LED illumination lamp sets, and the hazard of electric shock during repair and maintenance of the LED illumination lamp sets can also be avoided.
  • The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG. 1 is a schematic view of a conventional LED illumination lamp set.
    • FIG. 2 is a schematic view of the LED illumination lamp set of the invention.
    • FIG. 3 is a schematic view of a configuration of the LED illumination system of the invention.
    • FIG. 4 is a schematic circuit diagram of the LED illumination system of the invention.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Please refer to FIGS. 2, 3 and 4. the present invention aims to provide an LED illumination system that includes at least two LED illumination lamp sets 10, a DC power supply 20 and at least two power circuits 30 corresponding to the LED illumination lamp sets 10.
  • Each LED illumination lamp set 10 includes a reflective lamp shell 11 and a plurality of LEDs 12 which can generate light after receiving voltage. The light generated by the LEDs 12 is then reflected by the reflective lamp shell 11 for illumination.
  • The DC power supply 20 provides sufficient electric power for the LED illumination lamp sets 10. However, the power supplied by the DC power supply 20 also can be adjusted according to the actual number of the LED illumination lamp sets 10.
  • The DC power supply 20 is connected to the LED illumination lamp sets 10 via the power circuits 30. The LED illumination lamp sets 10 can be arranged according to requirements to meet illumination need, and are supplied at a required voltage by the power circuits 30.
  • Also referring to FIG. 4, the DC power supply 20 includes a transformer 21, an AC/DC converter 22 and a pulse width modulator (PWM in short hereinafter) 23. The transformer 21 receives commercial power from an AC power source 40 and is connected to the AC/DC converter 22, which is then connected to the PWM 23, and the PWM 23 is further connected to the power circuits 30. The PWM 23 and the power circuits 30 can be bridged by an adjustable resistor 24 and coupled with a capacitor 25 in parallel respectively.
  • The PWM 23 mainly includes a Bipolar Junction Transistor (BJT) 231, a base driver 232 and an operational amplifier (OP) 233. The operational amplifier 233 sends a feedback incorporating with the base driver 232 and BJT 231 to generate pulse width modulation. The transformer 21 and the AC power source 40 may also be bridged by a fuse 26.
  • By means of the structure set forth above, only a single DC power supply 20 can supply electric power required by the LED illumination lamp sets 10, hence the number of the DC power supply 20 can be reduced. Compared with the conventional techniques, the invention provides many advantages, notably:
    1. 1. Save material cost and total cost is reduced.
    2. 2. The LED illumination lamp sets 10 and DC power supply 20 are separated, thus the high temperature generated by the DC power supply 20 does not affect the lighting efficiency of the LED illumination lamp sets 10.
    3. 3. The hazard of electric shock to users caused by inadvertently touching the AC power source 40 during repair and maintenance of the LED illumination lamp sets 10 can be avoided.
    4. 4. Through the PWM 23, adjustable resistor 24 and capacitor 25. stability of the LED illumination system improves, and output voltage thereof can be adjusted as desired to alter the luminosity of the LED illumination lamp sets 10 to satisfy user's preference.

Claims (5)

  1. An LED illumination system, characterized by:
    at least two LED illumination lamp sets (10):
    a DC power supply (20) providing adequate electric power for the LED illumination lamp sets (10); and
    at least two power circuits (30) corresponding to the LED illumination lamp sets (10), the DC power supply (20) being connected to the LED illumination lamp sets (10) via the power circuits (30).
  2. The LED illumination system of claim 1, wherein each of the LED illumination lamp sets (10) includes a reflective lamp shell (11) and a plurality of light emitting diodes (12).
  3. The LED illumination system of claim 1 or 2, wherein the DC power supply (20) includes a transformer (21), an AC/DC converter (22) and a pulse width modulator (23), the transformer (21) receiving commercial power from an AC power source (40) and being connected to the AC/DC converter (22), the AC/DC converter (22) being connected to the pulse width modulator (23) which is connected to the power circuits (30).
  4. The LED illumination system of claim 3, wherein the pulse width modulator (23) and the power circuits (30) are bridged by an adjustable resistor (24) and coupled with a capacitor (25) in parallel respectively.
  5. The LED illumination system of claim 3 or 4, wherein the transformer (21) and the AC power source (40) are bridged by a fuse (26).
EP11181179A 2011-09-14 2011-09-14 LED illumination system Withdrawn EP2571332A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11181179A EP2571332A1 (en) 2011-09-14 2011-09-14 LED illumination system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11181179A EP2571332A1 (en) 2011-09-14 2011-09-14 LED illumination system

Publications (1)

Publication Number Publication Date
EP2571332A1 true EP2571332A1 (en) 2013-03-20

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EP11181179A Withdrawn EP2571332A1 (en) 2011-09-14 2011-09-14 LED illumination system

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EP (1) EP2571332A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13865U1 (en) * 2013-04-30 2014-10-15 Zumtobel Lighting Gmbh Supply-optimized luminaire
CN106090642A (en) * 2016-06-21 2016-11-09 杭州泽天科技有限公司 A kind of device and method stablizing LED light source energy

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060001381A1 (en) * 2004-06-30 2006-01-05 Robinson Shane P Switched constant current driving and control circuit
US20090295292A1 (en) * 2008-05-28 2009-12-03 Harmgardt Hans L G LED replacement for low voltage lamps
US7852009B2 (en) * 2006-01-25 2010-12-14 Cree, Inc. Lighting device circuit with series-connected solid state light emitters and current regulator
WO2011004796A1 (en) * 2009-07-07 2011-01-13 シーシーエス株式会社 Light emitting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060001381A1 (en) * 2004-06-30 2006-01-05 Robinson Shane P Switched constant current driving and control circuit
US7852009B2 (en) * 2006-01-25 2010-12-14 Cree, Inc. Lighting device circuit with series-connected solid state light emitters and current regulator
US20090295292A1 (en) * 2008-05-28 2009-12-03 Harmgardt Hans L G LED replacement for low voltage lamps
WO2011004796A1 (en) * 2009-07-07 2011-01-13 シーシーエス株式会社 Light emitting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13865U1 (en) * 2013-04-30 2014-10-15 Zumtobel Lighting Gmbh Supply-optimized luminaire
CN106090642A (en) * 2016-06-21 2016-11-09 杭州泽天科技有限公司 A kind of device and method stablizing LED light source energy

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