EP2876978A2 - Procédé de commande de puces à DEL de la même puissance mais de différentes tensions et courants nominaux - Google Patents

Procédé de commande de puces à DEL de la même puissance mais de différentes tensions et courants nominaux Download PDF

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Publication number
EP2876978A2
EP2876978A2 EP14178533.7A EP14178533A EP2876978A2 EP 2876978 A2 EP2876978 A2 EP 2876978A2 EP 14178533 A EP14178533 A EP 14178533A EP 2876978 A2 EP2876978 A2 EP 2876978A2
Authority
EP
European Patent Office
Prior art keywords
driving
power
led chip
current
voltage
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Withdrawn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
EP14178533.7A
Other languages
German (de)
English (en)
Other versions
EP2876978A3 (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
Priority claimed from TW102133504A external-priority patent/TWI538556B/zh
Application filed by HEP Tech Co Ltd filed Critical HEP Tech Co Ltd
Publication of EP2876978A2 publication Critical patent/EP2876978A2/fr
Publication of EP2876978A3 publication Critical patent/EP2876978A3/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present invention relates generally to driving LEDs, and more particularly to a method of driving LED chips of same power but different rated voltages and currents.
  • a LED (light-emitting diode) device typically includes a LED chip and a driving apparatus, wherein the driving apparatus provides power to the LED chip.
  • LED chips LED chips of different specifications may respectively have different rated voltage and rated current, even for those of the same power.
  • a LED chip of 28W is probably to have the following combinations of rated voltage and rated current: 80V/350mA, 56V/500mA, 40V/700mA, etc.
  • a driving apparatus merely fits one specific specification, and therefore could drive only LED chips of the same specification.
  • the inventory pressure of driving apparatuses is high for manufacturers.
  • the primary objective of the present invention is to provide a method of driving LED chips of same power but different rated voltages and currents, which is able to maintain the power provided to the LED chips within a predetermined range.
  • the method of driving LED chips of same power but different rated voltages and currents provided in the present invention includes the following steps: set a predetermined power; provide a LED chip which has a rated power accordant to the predetermined power; obtain a working current of the LED chip while the LED chip is operated at the predetermined power; provide a driving current to the LED chip, and maintain the driving current the same as the working current.
  • LED chips of the same power but different rated currents and voltages can be driven with the method provided in the present invention, and the power provided to the LED chips can be maintained within the predetermined range.
  • the method effectively improves the inconveniences due to the conventional way that one kind of driving apparatus only drives LED chips of the same specification.
  • a driving apparatus 1 for driving LED chips of the first preferred embodiment of the present invention includes an input port 1a, an output port 1b, a driving unit 10, a voltage measuring unit 20, a current measuring unit 30, a processing unit 40, and a control unit 50.
  • the input port 1a is electrically connected to a power source, and the output port 1b is provided to electrically connect to a LED chip 80.
  • the driving unit 10 is electrically connected to the input port 1a and the output port 1b. After the LED chip 80 is electrically connected to the output port 1b, the driving unit 10 receives power from the power source 70, and outputs a driving voltage and a driving current to the LED chip 80.
  • the driving unit 10 controllably regulates 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 processing unit 40 is electrically connected to the voltage measuring unit 20 and the current measuring unit 30. Also, the processing unit 40 is electrically connected to the driving unit 10 through the control unit 50. The processing unit 40 transmits a current controlling signal to the driving unit 10 through the control unit 50 according to the detection result of the voltage measuring unit 20 and the current measuring unit 30, and the driving unit 10 is controlled to regulate the driving current accordingly.
  • a method of driving LED chips can be applied with the aforementioned driving apparatus 1, wherein the method includes the following steps shown in FIG. 2 :
  • the method of driving LED chips further includes to maintain the driving voltage provided to the LED chip 80 no higher than an upper voltage limitation by transmitting a voltage restriction signal to the driving unit 10 from the processing unit 40 when the voltage measuring unit 20 detects that the driving voltage exceeds the upper voltage limitation.
  • the method of driving LED chips further includes to maintain the driving current provided to the LED chip 80 no higher than an upper current limitation by transmitting a current restriction signal to the driving unit 10 from the processing unit 40 when the current measuring unit 30 detects that the driving current exceeds the upper current limitation.
  • a plurality of power values are saved in the processing unit 40 in advance before step A, and the driving apparatus 1 further includes an input unit 60 electrically connected to the processing unit 40, as shown in FIG. 3 .
  • the predetermined power is set by selecting one of the power values through the input unit 60.
  • the driving apparatus 1 can be further compatible with LED chips of different rated power.
  • the design of the input unit 60 can be based on several switches, and a user can set the predetermined power by simply switching the switches.
  • the predetermined power can be set in a different way other than using the input unit 60 as in the second preferred embodiment.
  • a power supplying device 82 shown in FIG. 4 is provided, wherein the processing unit 40 has an output terminal 822, from which an output voltage is outputted.
  • the output terminal 822 of the power supplying device 82 is electrically connected to the output port 1b of the driving apparatus 1.
  • the output voltage of the power supplying device 82 is detected by the voltage measuring unit 20.
  • the processing unit 40 sets the predetermined power.as a value of the output voltage.
  • the output terminal 822 of the power supplying device 82 is electrically disconnected from the output port 1b of the driving apparatus 1, and therefore the power supplying device 82 is electrically disconnected from the driving apparatus 1.
  • the reference voltage stored in the processing unit 40 is 30V, while the predetermined power is 40W. If the user intends to set the predetermined power as 32W, he/she regulates the output voltage of the power supplying device 82 as 32V, and then electrically connects the power supplying device 82 to the output port 1b of the driving apparatus 1. At this time point, the voltage measuring unit 20 detects that the output voltage is 32V, and since the value is higher than the reference voltage (30V), the processing unit 40 sets the predetermined power as 32W. In other words, in the third preferred embodiment, the predetermined power is set by regulating the output voltage of the power supplying device 82.
  • the driving apparatus 1 is compatible to LED chips of different rated powers, and the driving voltage and the driving current required to be provided to the LED chips can be precisely obtained.
  • the driving apparatus 1 can be electrically disconnected from the power supplying device 82 after step A and before step C. In other words, such step can be taken at any time point after the output voltage of the power supplying device 82 is detected, and before the LED chip 80 is electrically connected to the output port 1b.
  • the driving apparatus is compatible to drive all LED chips of the same rated power, even though their rated voltages and rated currents are different from each other, which effectively improves the inconvenience of the conventional way that one driving apparatus can only drive LED chip of one certain specification.

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP14178533.7A 2013-09-16 2014-07-25 Procédé de commande de puces à DEL de la même puissance mais de différentes tensions et courants nominaux Withdrawn EP2876978A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW102133504A TWI538556B (zh) 2013-03-27 2013-09-16 Application of the same power different voltage and current specifications of the light-emitting diode chip drive method

Publications (2)

Publication Number Publication Date
EP2876978A2 true EP2876978A2 (fr) 2015-05-27
EP2876978A3 EP2876978A3 (fr) 2015-11-04

Family

ID=51224815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14178533.7A Withdrawn EP2876978A3 (fr) 2013-09-16 2014-07-25 Procédé de commande de puces à DEL de la même puissance mais de différentes tensions et courants nominaux

Country Status (1)

Country Link
EP (1) EP2876978A3 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200926896A (en) * 2007-12-06 2009-06-16 Bin-Juine Huang Constant power driving-and-controlling method for light emitting elements
US8174197B2 (en) * 2009-04-09 2012-05-08 Ge Lighting Solutions Llc Power control circuit and method
US8502476B2 (en) * 2009-10-16 2013-08-06 Samsung Electronics Co., Ltd Method and apparatus for controlling power consumption of light source in mobile projector

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP2876978A3 (fr) 2015-11-04

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