EP2785145A2 - Procédé de commande pour DELs aux propriétés différentes - Google Patents

Procédé de commande pour DELs aux propriétés différentes Download PDF

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Publication number
EP2785145A2
EP2785145A2 EP14160490.0A EP14160490A EP2785145A2 EP 2785145 A2 EP2785145 A2 EP 2785145A2 EP 14160490 A EP14160490 A EP 14160490A EP 2785145 A2 EP2785145 A2 EP 2785145A2
Authority
EP
European Patent Office
Prior art keywords
current
voltage
driving
led chip
setting
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Withdrawn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
EP14160490.0A
Other languages
German (de)
English (en)
Other versions
EP2785145A3 (fr
Inventor
Ming-Feng Lin
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.)
HEP Tech Co Ltd
Original Assignee
HEP Tech 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 HEP Tech Co Ltd filed Critical HEP Tech Co Ltd
Publication of EP2785145A2 publication Critical patent/EP2785145A2/fr
Publication of EP2785145A3 publication Critical patent/EP2785145A3/fr
Withdrawn legal-status Critical Current

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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
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the present invention relates generally to driving LED, and more particularly to a method of driving LED chips of different specifications.
  • a LED illuminating device typically includes a LED chip and a driving apparatus, wherein the driving apparatus provides power to drive the LED chip.
  • the driving apparatus provides power to drive the LED chip.
  • LED chips there are various types of LED chips in the current market, and LED chips of different specifications may individually have different rated voltages and rated currents.
  • a driving apparatus merely fits one specific specification, and therefore could drive only one type of LED chips.
  • the inventory pressure of driving apparatuses is high. And given that manufacturers have to produce driving apparatuses to drive each type of LED chips, the quantities of each type of driving apparatuses is limited, and therefore the price and the manufacturing cost is hardly lowered. If a method of driving LED chips of different specifications can be provided, the inventory pressure and the manufacturing cost of driving apparatuses will be effectively reduced.
  • the primary objective of the present invention is to provide a method of driving LED chips, wherein the LED chips have different specifications.
  • the present invention provides a method of supplying a method of driving LED chips, wherein the LED chips have different specifications, which include the steps of: A. defining a plurality of setting currents; B. connecting a LED chip; C. selecting one of the setting currents which matches a rated current of the LED chip; and D. providing power with the selected setting current to the LED chip.
  • the method of driving LED chips could be applied to drive LED chips of different specifications, which effectively improves the inconvenience of the conventional driving apparatus that it could be only compatible with LED chips of one specific specification.
  • FIG. 1 A driving apparatus 1 for driving LED (light emitting diode) chips of different specifications of a first embodiment of the present invention is shown in FIG. 1 , which includes a driving unit 10, a voltage measuring unit 20, a processing unit 30, and a control unit 40.
  • the driving unit 10 electrically connects a power source 50 to a LED chip 60, wherein the driving unit 10 receives power from the power source 50, and outputs a driving voltage and a driving current to the LED chip 60.
  • the driving unit 10 is controllable to change the driving voltage and the driving current.
  • the design of the driving unit 10 could be based on PWM, half-bridge, buck, or boost circuits.
  • the voltage measuring unit 20 is electrically connected to the driving unit 10 to measure the driving voltage outputted to the LED chip 60 from the driving unit 10.
  • the processing unit 30 is electrically connected to the voltage measuring unit 20, and the processing unit 30 is electrically connected to the driving unit 10 through the control unit 40.
  • the processing unit 30 has a memory.
  • the aforementioned driving apparatus 1 could be used to apply a method of driving LED chips of different specifications.
  • 5 LED chips with different specifications for explanation purpose which respectively have a rated voltage and a rated current of 45V/500mA, 38V/700mA, 34V/900mA, 20V/1500mA, and 14V/1400mA, and any one of said LED chips could be connected to the driving unit 10 to be the LED chip 60.
  • a voltage of each said LED chips is measured first while they are operating with a testing current, wherein the testing current is lower than rated currents of all the LED chips, and the testing current is a constant current. It may get a voltage when said LED chip is operating with the testing current, and this voltage is defined as a reference voltage, and the reference voltages of said LED chips are different from each other.
  • the method of driving the LED chips includes the following steps:
  • the driving apparatus 1 when the LED chip 60 is connected to the driving apparatus 1, the rated current of the LED chip 60 could be automatically detected, and therefore the driving apparatus 1 could provide the power which meets the requirement of the LED chip 60. In other words, the driving apparatus 1 could deal with LED chips of different specifications.
  • each setting current corresponds to a reference voltage
  • each setting current corresponds to a reference voltage segment in a second preferred embodiment of the present invention.
  • FIG. 4 The flow chart of the second preferred embodiment of the present invention shown in FIG. 4 has roughly the same steps with the first embodiment, and the differences are described as followings.
  • step A a plurality of reference voltage segments and a plurality of current parameters are defined in the database in advance, wherein each reference voltage segment relates to one of the current parameters.
  • the driving apparatus 1 has a plurality of different setting currents, and each setting current corresponds to one of the reference voltage segments.
  • the driving unit 10 is controlled to output the testing current to the LED chip 60, and the voltage of the LED chip 60 is measured at the same time.
  • the current parameter which relates to that reference voltage segment is obtained from the database, and therefore the corresponding setting current is then selected.
  • the driving unit 10 is controlled to output the driving current as the selected setting current, which equals the rated current of the LED chip 60.
  • the driving unit 10 automatically regulates the driving voltage depending on the electronic properties of the LED chip 60, and therefore the power provided to the LED chip 60 could successfully fit its specification.
  • an output curve of the driving apparatus 1 is shown in FIG. 5 .
  • any LED chip as long as its rated current matches the five currents in FIG. 5 while its rated voltage falls in the corresponding reference voltage segment, such LED chip could be powered by the driving apparatus 1. Therefore, the driving apparatus 1 could be applied to drive more types of LED chips, not just the 5 LED chips provided in the first embodiment.
  • zero voltage is included in one of the reference voltage segments in the database.
  • the driving voltage is measured as zero in the step C, there is still a corresponding setting current.
  • control unit 40 transmits a voltage restriction signal to the driving unit 10 when the driving voltage measured by the voltage measuring unit 20 is higher than an upper limit voltage in the step D. After the driving unit 10 receives the voltage restriction signal, the driving voltage outputted to the LED chip 60 is maintained as the upper limit voltage. Whereby, the driving voltage outputted to the driving unit 10 wouldn't be too high to damage the LED chip 60 or the driving unit 10.
  • the reference voltages, the current parameters, and the reference voltage segments in the database are stored in the memory of the processing unit 30 in the step A.
  • the processing unit 30 could be a comparator circuit too.
  • the reference voltage or reference voltage segment which corresponds to the driving voltage is determined by the comparator circuit in the step C.
  • the comparator circuit outputs the corresponding voltage to the control unit, and the control unit transmits the corresponding current control signal to the driving unit 10 according to the received voltage. As a result, the corresponding setting current is selected.
  • the driving apparatus 1 is able to drive the LED chips of different specifications, and is not limited for any specific one type of the LED chips.
  • the inconvenience of the conventional driving apparatus i.e., it could only drive the LED chip of one specific specification, is effectively improved.

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  • Led Devices (AREA)
EP14160490.0A 2013-03-27 2014-03-18 Procédé de commande pour DELs aux propriétés différentes Withdrawn EP2785145A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW102110957 2013-03-27

Publications (2)

Publication Number Publication Date
EP2785145A2 true EP2785145A2 (fr) 2014-10-01
EP2785145A3 EP2785145A3 (fr) 2015-10-21

Family

ID=50349454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14160490.0A Withdrawn EP2785145A3 (fr) 2013-03-27 2014-03-18 Procédé de commande pour DELs aux propriétés différentes

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EP (1) EP2785145A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3541149A1 (fr) * 2018-03-14 2019-09-18 Siteco Beleuchtungstechnik GmbH Luminaire et procédé de détection de modules à del

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6501235B2 (en) * 2001-02-27 2002-12-31 Stmicroelectronics Inc. Microcontrolled ballast compatible with different types of gas discharge lamps and associated methods
DE102006056057A1 (de) * 2006-02-28 2007-09-06 Samsung Electro - Mechanics Co., Ltd., Suwon Antriebsvorrichtung für ein farbiges LED-Hintergrundlicht
JP5311624B2 (ja) * 2008-05-22 2013-10-09 パナソニック株式会社 照明点灯装置
JP5289471B2 (ja) * 2011-01-21 2013-09-11 三菱電機株式会社 光源点灯装置及び照明装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3541149A1 (fr) * 2018-03-14 2019-09-18 Siteco Beleuchtungstechnik GmbH Luminaire et procédé de détection de modules à del

Also Published As

Publication number Publication date
EP2785145A3 (fr) 2015-10-21

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