WO2010047433A1 - Circuit de commande destiné à une lampe à del ultra-lumineuse - Google Patents

Circuit de commande destiné à une lampe à del ultra-lumineuse Download PDF

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Publication number
WO2010047433A1
WO2010047433A1 PCT/KR2008/006844 KR2008006844W WO2010047433A1 WO 2010047433 A1 WO2010047433 A1 WO 2010047433A1 KR 2008006844 W KR2008006844 W KR 2008006844W WO 2010047433 A1 WO2010047433 A1 WO 2010047433A1
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WO
WIPO (PCT)
Prior art keywords
voltage
led
current
unit
control unit
Prior art date
Application number
PCT/KR2008/006844
Other languages
English (en)
Inventor
Ki Ho Nam
Original Assignee
Ki Ho Nam
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 Ki Ho Nam filed Critical Ki Ho Nam
Publication of WO2010047433A1 publication Critical patent/WO2010047433A1/fr

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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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/18—Controlling the intensity of the light using temperature feedback
    • 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]

Definitions

  • the present invention relates to a high-luminance LED illumination apparatus that may be substituted for a fluorescent light tube, and more specifically, to a circuit for driving a high-luminance LED lamp that may be substituted for a fluorescent light tube, to which alternating or direct current voltage can be applied, wherein constant voltage and current are applied to an LED although strength of voltage or surrounding temperature is changed, thereby minimizing power consumption by constantly maintaining brightness of light and further minimizing power consumption by feeding back and reusing surplus power, as well as preventing damage of the LED.
  • a light emitting diode is a diode that emits light when current is applied. If forward voltage is applied to a semiconductor of a specific element, electrons and holes move across the junction between a P-type semiconductor and an N-type semiconductor and recombine with each other, and the energy is smaller than when the electrons and holes are apart.
  • the LED is a light emitting device that emits light by the difference of energy generated at the moment.
  • the LED is a light emitting device that can be driven at low voltage, which has advantages of an extended lifetime, low power consumption, a fast response time, and a superior shock-proof characteristic, compared with other light emitting objects. Since the LED can be advantageously manufactured in a miniaturized and light form, application of the LED is expanded centering on a display purpose, and the LED increasingly tends to be used as a main illumination or outdoor display apparatus as luminance of the LED is improved. Although there is a limitation in luminance and colors in the early stage, it is possible to display natural full-colors as high-luminance blue-color LEDs are developed and manufactured, and thus all colors can be displayed if blue-color LEDs are combined with red and green-color LEDs. Therefore, the LEDs are spotlighted as being used as a component of displays, traffic lights, electric signboards, illumination equipment, and the like, which have characteristics of an extended lifetime, high-luminance, and high visibility.
  • LEDs having luminance that is at least ten times as high as that of conventional high-luminance LEDs they are used for scenery illuminations, such as wall-recessed lights, indoor lights, under ground lights, flood lights, power liners, and the like, or special illuminations such as LED flash and the like.
  • scenery illuminations such as wall-recessed lights, indoor lights, under ground lights, flood lights, power liners, and the like, or special illuminations such as LED flash and the like.
  • filament light bulbs, fluorescent light tubes, neon signs, and the like are examples of an illumination apparatus installed in an indoor or outdoor advertisement material or signboard configured with channels of large-scaled screens, figures, characters, and the like, which are used to easily distinguish images in the daytime or nighttime.
  • the filament light bulb that illuminates using light emitted by heat has a short lifetime since the filament is oxidized by the heat, and there is danger of fire since excessive heat is generated due to high power consumption.
  • the fluorescent light tube is inconvenient in that it should be frequently replaced due to a very short lifetime of 3,000 to 10,000 hours and disadvantageous in that brightness thereof is degraded as the lamp is aged.
  • the fluorescent light tube is disadvantageous in that since fluorescent light tubes are not replaced in time although some of the fluorescent light tubes are out of order or getting dimmer, the effect of advertisement cannot be properly accomplished.
  • LED illumination apparatuses using LEDs of semi-permanent lifetime, low cost, and low power consumption come to be used.
  • the LED illumination apparatus has advantages of low power consumption, low heat, and semipermanent lifetime, a plurality of LEDs are used in combination only for a simple display function since luminance of the LEDs is low.
  • high-luminance LEDs are manufactured and used recently as techniques are advanced.
  • An LED illumination apparatus uses DC voltage generated through a diode or bridge circuit (a rectify circuit) after inputted AC voltage is dropped to required voltage through a transformer, and brightness of the LEDs is adjusted by controlling strength of voltage or current.
  • the LEDs require a stable power supply having constant voltage and current, it is particularly difficult to supply constant current. Furthermore, if the LEDs are exposed to outside and environmental conditions such as temperature, humidity, and the like are getting worse, there is a problem in that since abrupt change of current and voltage, which is incurred due to varying load, and ripples of the current are insufficiently controlled, the LEDs are damaged due to abnormal operation.
  • the high-luminance LEDs can use a light source only when constant voltage is applied, there is a problem in that the high-luminance LEDs are limited to use only DC voltage currently and it is difficult to use the high-luminance LEDs without help of an expert technician. In addition, there is a problem in that since a circuit is configured based only on power used for the LEDs, power is severely wasted. Furthermore, durability of the LEDs is degraded since the amount of current is increased due to decrease of internal resistance of components as internal temperature of an LED illumination apparatus rises more than 80 degrees Celsius in summertime. Disclosure of Invention Technical Problem
  • the present invention has been made in order to solve the above problems, and it is an object of the invention to provide a modular-type LED illumination apparatus that uses free voltage, which can be easily handled, installed, and used without difficulty of supplying constant voltage and help of an expert technician as is suffered in the prior art.
  • Voltage of 10V to 250V can be used regardless of using an AC or DC power supply, and voltage is flattened by filtering ripple voltage that is generated when AC voltage is used.
  • the voltage portion of the power consumed by the LED is maintained to be constant at all times within the range of power supply of 10V to 250V, and surplus power is fed back to minimize power consumption.
  • the temperature and voltage are changed, brightness of light remains constant, and the LED operates stably. Therefore, damage of the LED can be prevented, and thus the LED illumination apparatus can be used for an extended period of time.
  • Another object of the invention is to provide an LED lamp that may be substituted for a fluorescent light tube as a modular-type LED illumination apparatus using free voltage, in which LEDs are buried with epoxy resin as a water-proof process, and thus durability is increased since erosion is prevented. Since surface emission is accomplished, the LED lamp can be easily distinguished from a far distance.
  • a circuit for driving a high-luminance LED that is lit and emits light when current flows, the circuit comprising: a power supply unit for converting one input power to voltage appropriate to drive the high-luminance LED; a rectify unit including a plurality of bridge diodes, for converting the voltage generated by the power supply unit into DC voltage; a filter unit including a plurality of electrolytic condensers, for flattening voltage by filtering ripple voltage applied from the rectify unit; a voltage control unit including a regulator and a resistor, for receiving the DC voltage passing through the filter unit and providing a PWM signal needed to drive the LED; a drive control unit including a field effect transistor and resistors, for controlling on-off and amount of current flowing through the LED; and a current control unit for controlling the amount of current by comparatively compensating a characteristic of current change of the LED affected by change of temperature.
  • the voltage control unit preferably includes a regulating integrated circuit for controlling over- voltage and over-current, a resistor element connected to an output terminal of the regulating integrated circuit in a series, for preventing damage and poor quality of the LED invited by over-current, and a condenser connected to a connection terminal of the regulating integrated circuit, for controlling and setting input power and power consumption.
  • the current control unit for compensating temperature includes a diode, a condenser, and a coil, for feeding back over-current when the over-current flows through the high-luminance LED
  • the present invention preferably corresponds to one power supply, it is apparent that a plurality of driving circuits can be configured in common so that a plurality of LEDs can be driven according to a plurality of different operating powers.
  • the present invention is effective in that power consumption is minimized by maintaining brightness of light and further minimized by feeding back and reusing surplus power, as well as preventing damage of LEDs by applying constant voltage and current to the LEDs although strength of voltage and surrounding temperature are changed. [17] Accordingly, the present invention is effective in that it is possible to provide an
  • LED lamp that may be substituted for a fluorescent light tube, which can be used in conventional fluorescent illumination equipment without change or modification of a power supply apparatus.
  • FIG. 1 is a diagram showing a driving circuit of a high-luminance LED lamp that may be substituted for a fluorescent light tube according to an embodiment of the invention.
  • FIG. 2 is a diagram showing a driving circuit of a high-luminance LED lamp that may be substituted for a fluorescent light tube according to another embodiment of the invention.
  • FIG. 1 shows a circuit for driving a high-luminance LED according to an embodiment of the present invention.
  • a power supply unit 100 comprises a surge protective element SVR, a coil L x , and a condenser C x and converts one input power into voltage appropriate to drive the high-luminance LED.
  • the power supply unit 100 may use a power supply apparatus, such as a general AC-DC converter, AC line transformer, or the like, preferably one that may generate one constant voltage and constant current.
  • Power supplied to the power supply unit 100 is applied to a rectify unit 200 comprising bridge diodes Dl to D4 and converted to DC voltage, and a filter unit 300 comprising a plurality of electrolytic condensers Cl to C4 operates not to affect components and the LED by charging and discharging voltage having an irregular peak waveform supplied from the rectify unit 200.
  • the filter unit 300 flattens the voltage by filtering ripple voltage that is generated when AC power is used in order to provide the same condition as that of using DC power.
  • the DC voltage passing through the filter unit 300 is inputted into a voltage control unit 400 and provides a PWM signal needed to drive the LED, and the voltage control unit 400 comprises a regulator ICl, a resistor Rl, a condenser C5, and a zener diode ZD.
  • the regulator ICl of the voltage control unit 400 controls over- voltage and over- current, and the resistor Rl and the condenser C5 are connected to the output terminal of the regulator ICl in a series and prevent damage and poor quality of the LED incurred by over-current.
  • a driving control unit 500 comprising resistors R3 and R4 and a field effect transistor FET is connected to the gate terminal GATE of the regulator ICl in order to input a pulse width modulation signal.
  • the gate terminal GATE of the regulator ICl controls on-off and brightness of the high-luminance LED.
  • FIG. 2 shows another embodiment of the invention. Comparing with FIG. 1, since another embodiment is the same as the embodiment described above except that two inputs INPUTl and INPUT 2 and two outputs LEDl and LED2 are generated and two high-efficiency LED fluorescent light tubes are driven, detailed description will be omitted.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

Cette invention se rapporte à un circuit permettant de commander une lampe d’éclairage à DEL à luminance élevée qui peut remplacer un tube fluorescent. Ce circuit comprend : une unité d’alimentation (100) servant à transformer une puissance d’entrée en une tension appropriée pour commander la DEL à luminance élevée; une unité de redressement (200) qui comporte une pluralité de diodes ponts et qui sert à transformer la tension produite par l’unité d’alimentation (100) en une tension continue; une unité de filtrage (300) qui comporte une pluralité de condensateurs électrolytiques et qui est conçue pour égaliser la tension par filtrage de la tension d’ondulation appliquée par l’unité de redressement (200); une unité de régulation de tension (400) qui comporte un régulateur et une résistance, qui reçoit la tension continue traversant l’unité de filtrage (300) et qui produit un signal PWM nécessaire à la commande de la DEL; une unité de régulation de commande (500) qui comporte un transistor à effet de champ et des résistances, et qui est destinée à réguler la circulation/non-circulation du courant ainsi que la quantité de courant qui traverse la DEL; et une unité de régulation de courant (600) qui sert à réguler la quantité de courant grâce à la compensation comparative d’une caractéristique de variation de courant de la DEL qui est modifiée en cas de variation de température.
PCT/KR2008/006844 2008-10-25 2008-11-20 Circuit de commande destiné à une lampe à del ultra-lumineuse WO2010047433A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20080105040 2008-10-25
KR10-2008-0105040 2008-10-25

Publications (1)

Publication Number Publication Date
WO2010047433A1 true WO2010047433A1 (fr) 2010-04-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013177757A1 (fr) * 2012-05-30 2013-12-05 Zou Gaodi Pilote de réglage de lumière à del et système de source de lumière à del
US9049765B1 (en) 2014-09-04 2015-06-02 Colorado Energy Research Technologies, LLC Systems and methods for converting alternating current to drive light-emitting diodes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004207411A (ja) * 2002-12-25 2004-07-22 Nec Saitama Ltd Ｌｅｄ表示装置及びその点灯方法並びにプログラム
JP2005347133A (ja) * 2004-06-04 2005-12-15 Shindengen Electric Mfg Co Ltd Ｌｅｄ点灯駆動回路
JP2006222376A (ja) * 2005-02-14 2006-08-24 Seiwa Electric Mfg Co Ltd 電源装置及び照明装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004207411A (ja) * 2002-12-25 2004-07-22 Nec Saitama Ltd Ｌｅｄ表示装置及びその点灯方法並びにプログラム
JP2005347133A (ja) * 2004-06-04 2005-12-15 Shindengen Electric Mfg Co Ltd Ｌｅｄ点灯駆動回路
JP2006222376A (ja) * 2005-02-14 2006-08-24 Seiwa Electric Mfg Co Ltd 電源装置及び照明装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013177757A1 (fr) * 2012-05-30 2013-12-05 Zou Gaodi Pilote de réglage de lumière à del et système de source de lumière à del
US9049765B1 (en) 2014-09-04 2015-06-02 Colorado Energy Research Technologies, LLC Systems and methods for converting alternating current to drive light-emitting diodes
US9661699B2 (en) 2014-09-04 2017-05-23 Colorado Energy Research Technologies, LLC Systems and methods for converting alternating current to drive light-emitting diodes

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