EP1868420A2 - Lichtansteuerungsvorrichtung - Google Patents

Lichtansteuerungsvorrichtung Download PDF

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Publication number
EP1868420A2
EP1868420A2 EP07110099A EP07110099A EP1868420A2 EP 1868420 A2 EP1868420 A2 EP 1868420A2 EP 07110099 A EP07110099 A EP 07110099A EP 07110099 A EP07110099 A EP 07110099A EP 1868420 A2 EP1868420 A2 EP 1868420A2
Authority
EP
European Patent Office
Prior art keywords
terminal
control signal
light driving
signal
light
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.)
Granted
Application number
EP07110099A
Other languages
English (en)
French (fr)
Other versions
EP1868420A3 (de
EP1868420B1 (de
Inventor
Jung-Yuan Tsai
Kuo-Feng Chen
Ching-Hao Tseng
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.)
HTC Corp
Original Assignee
High Tech Computer Corp
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 High Tech Computer Corp filed Critical High Tech Computer Corp
Publication of EP1868420A2 publication Critical patent/EP1868420A2/de
Publication of EP1868420A3 publication Critical patent/EP1868420A3/de
Application granted granted Critical
Publication of EP1868420B1 publication Critical patent/EP1868420B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a light driving device and, in particular, to a light driving device and a light driving method for alternately driving lights with a single signal.
  • lights are often used to indicate different states thereof. Different light signals are required according to different applications of the electronic devices. As a result, light driving devices are required to control flashing, i.e. ON and OFF states, of the lights.
  • the first one is that control signals of light emitting diodes (LEDs) are provided by a general purpose input/output (GPIO) of a central processing unit (CPU), and duty cycles and periods of the control signals are determined by programs and counters inside the CPU.
  • GPIO general purpose input/output
  • CPU central processing unit
  • the second one is that an LPG controller for providing control signals of LEDs is built into a CPU, in which there are some adjustable parameters such as ON/OFF, frequency, duty cycle, etc., and durations and periods of the control signals are determined by counters in an integrated circuit (IC).
  • IC integrated circuit
  • two LPG controllers are alternately activated to generate two alternating control signals for driving two LEDs.
  • the method for driving two LEDs has two disadvantages: (1) one more LPG controller is required and thus increases circuit complexity; and (2) time intervals between the two alternating control signals are determined by respective activation timing of the LPG controllers and thus cannot be controlled precisely.
  • One embodiment of the present invention provides a light driving device, which comprises a signal generator, a demultiplexer and a first light driving circuit and a second light driving circuit.
  • the signal generator generates a signal.
  • the demultiplexer converts the signal to a first control signal and a second control signal.
  • the first and second light driving circuits are respectively controlled by the first and second control signals.
  • a light driving device which comprises a signal generator, a demultiplexer and a first light driving circuit and a second light driving circuit.
  • the signal generator generates a signal.
  • the demultiplexer comprises a D flip-flop for converting the signal to a first control signal and a second control signal.
  • the first and second light driving circuits are respectively controlled by the first and second control signals.
  • Another embodiment of the present invention provides a light driving method, which comprises generating a signal, converting the signal to a first control signal and a second control signal, and controlling two lights according to the first control signal and the second control signal.
  • the light driving device controls more than one light emitting diode with one LPG pin such that LPG pins can be saved.
  • flashing duty cycles of the light emitting diodes can be controlled by setting the period and duty cycle of one LPG signal in software associated with the light driving device.
  • Fig. 1 is a circuit diagram of a conventional light driving device
  • Fig. 2 is a circuit diagram of a conventional light driving device
  • Fig. 3 is a block diagram of a light driving device according to one embodiment of the invention.
  • Fig. 4 is a circuit diagram of the light driving device 300 shown in Fig. 3;
  • Fig. 5 is a timing diagram of signals for operation of the light driving device 300 shown in Fig. 4; ;
  • Fig. 6 is a flow chart of a light driving method for driving lights according to an embodiment of the invention.
  • Fig. 3 is a block diagram of a light driving device according to one embodiment of the invention.
  • the light driving device 300 comprises a signal generator 310, a demultiplexer 320 and at least one light driving circuit 330.
  • the signal generator 310 generates a signal.
  • the demultiplexer 320 converts the signal to at least one control signal.
  • the light driving circuits 330 are controlled by the control signals.
  • the signal generator 310 is an LED pulse generator (LPG) which generates an LPG signal.
  • Each light driving circuit 330 comprises a light emitting diode 331 and a switch 333.
  • the switch 333 is a MOS transistor.
  • the light emitting diode 331 has a first terminal 332 connected to a first voltage V DD .
  • the switch 333 has a first terminal (drain) 335 coupled to a second terminal 334 of the light emitting diode 331, a second terminal (source) 336 coupled to a second voltage V SS , and a third terminal (gate) 337 coupled to the demultiplexer 320 for receiving the control signal.
  • the first voltage V DD and the second voltage V SS are respectively a power supply voltage and a ground.
  • Fig. 4 is a circuit diagram of the light driving device 300 shown in Fig. 3. More specifically, the demultiplexer 320 comprises a D flip-flop 322, a first diode D1 and a second diode D2.
  • the D flip-flop 322 has a data input terminal D, a clock terminal CLK, an output terminal Q and an inverting output terminal Q' .
  • the clock terminal CLK receives the signal.
  • the inverting output terminal Q' outputs an output signal fed back to the data input terminal D.
  • the output terminal and the inverting output terminal Q' respectively control the light driving circuits 330.
  • the first diode D1 has an anode 323 coupled to the output terminal Q and a cathode 325 coupled to the clock terminal CLK.
  • the second diode D2 has an anode 327 coupled to the inverting output terminal Q' and a cathode 328 coupled to the clock terminal CLK.
  • Fig. 5 is a timing diagram of signals for the operation of the light driving device 300 shown in Fig. 4.
  • LPG represents a signal generated by the signal generator 310.
  • Q and Q' respectively represent output signals of the output terminal Q and the inverting output terminal Q' .
  • a and B respectively represent voltage levels of the nodes A and B shown in Fig. 4.
  • operation of the light driving device 300 can be divided into four stages. In the first stage, when the signal LPG transits from low level to high level, the logic state of the signal Q' is then latched via the data input terminal D. As a result, the signal Q transits from low level to high level and the signal Q' transits from high level to low level.
  • the first and second diodes D1, D2 are reverse-biased and the nodes A and B are respectively at high and low levels.
  • the first diode D1 is forward biased such that the node A is pulled to low level and the node B stays in low level.
  • the logic state of the signal Q' is then latched via the data input terminal D. As a result, the signal Q transits from high level to low level and the signal Q' transits from low level to high level.
  • the first diode D1 and the second diode D2 are reverse biased such that the node A stays in low level and the node B transits from low level to high level.
  • the fourth stage when the signal LPG transits from high level to low level, the second diode D2 is forward biased such that the node B is pulled to low level and the node A still stays in low level.
  • the four stages repeat again and again and the light emitting diodes 331 are alternately turned ON/OFF with a period twice of that of the LPG signal.
  • the present invention also provides a light driving method for driving lights.
  • the method comprises generating a signal (610), converting the generated signal to a first control signal and a second control signal (620), and controlling two lights according to the first control signal and the second control signal (630).
  • the generated signal is an LPG signal and the lights are light emitting diodes.
  • the light driving device controls more than one light emitting diode with one LPG pin such that LPG pins can be saved.
  • flashing duty cycles of the light emitting diodes can be controlled by setting the period and duty cycle of one LPG signal in software associated with the light driving device.

Landscapes

  • Led Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Semiconductor Lasers (AREA)
EP07110099.4A 2006-06-13 2007-06-12 Lichtansteuerungsvorrichtung Active EP1868420B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200610092688.6A CN101090595B (zh) 2006-06-13 2006-06-13 灯号驱动装置

Publications (3)

Publication Number Publication Date
EP1868420A2 true EP1868420A2 (de) 2007-12-19
EP1868420A3 EP1868420A3 (de) 2008-12-03
EP1868420B1 EP1868420B1 (de) 2014-11-26

Family

ID=38481940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07110099.4A Active EP1868420B1 (de) 2006-06-13 2007-06-12 Lichtansteuerungsvorrichtung

Country Status (2)

Country Link
EP (1) EP1868420B1 (de)
CN (1) CN101090595B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109375451A (zh) * 2018-09-25 2019-02-22 东莞锐视光电科技有限公司 光源控制器触发延时控制方法及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050021883A1 (en) 1999-01-25 2005-01-27 Canon Kabushiki Kaisha Input/output control apparatus
EP1656001A1 (de) 2004-11-03 2006-05-10 High Tech Computer Corp. Blinkleuchtensteuergerät und Steuerverfahren desselben

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6786625B2 (en) * 1999-05-24 2004-09-07 Jam Strait, Inc. LED light module for vehicles
DE10115388A1 (de) * 2001-03-28 2002-10-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Ansteuerschaltung für ein LED-Array
JP2004235498A (ja) * 2003-01-31 2004-08-19 Anden 発光ダイオードの制御装置
WO2005089309A2 (en) * 2004-03-15 2005-09-29 Color Kinetics Incorporated Power control methods and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050021883A1 (en) 1999-01-25 2005-01-27 Canon Kabushiki Kaisha Input/output control apparatus
EP1656001A1 (de) 2004-11-03 2006-05-10 High Tech Computer Corp. Blinkleuchtensteuergerät und Steuerverfahren desselben

Also Published As

Publication number Publication date
CN101090595A (zh) 2007-12-19
CN101090595B (zh) 2014-09-10
EP1868420A3 (de) 2008-12-03
EP1868420B1 (de) 2014-11-26

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