EP1868420B1 - Lichtansteuerungsvorrichtung - Google Patents

Lichtansteuerungsvorrichtung Download PDF

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Publication number
EP1868420B1
EP1868420B1 EP07110099.4A EP07110099A EP1868420B1 EP 1868420 B1 EP1868420 B1 EP 1868420B1 EP 07110099 A EP07110099 A EP 07110099A EP 1868420 B1 EP1868420 B1 EP 1868420B1
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EP
European Patent Office
Prior art keywords
terminal
light
signal
control signal
light driving
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Application number
EP07110099.4A
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English (en)
French (fr)
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EP1868420A3 (de
EP1868420A2 (de
Inventor
Jung-Yuan Tsai
Kuo-Feng Chen
Ching-Hao Tseng
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HTC Corp
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HTC Corp
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Publication of EP1868420A3 publication Critical patent/EP1868420A3/de
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Publication of EP1868420B1 publication Critical patent/EP1868420B1/de
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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.
  • EP 1 656001 A relates to a flashing light apparatus and method for operating the same.
  • a pulse signal generated by a pulse signal generator (202) and the states of the general purpose Input/Output pins (306,308,310) of a CPU (200) are used to control the lights (324,326,328) to flash.
  • US 2005 21883 A relates to an multiple lighting apparatus coupled together to form a lighting network, in which operating power is efficiently provided throughout the network based on a distributed DC voltage or a distributed AC voltage. Based on various power driver configurations, each lighting apparatus incorporates one or more power drivers for one or more LED-based loads. In one example, a controlled predetermined power is provided to a load without requiring any feedback information from the load (i.e., without monitoring a load voltage and/or load current).
  • a "feed-forward" power driver for an LED-based light sources combines the functionality of a DC-DC converter and a light source controller, and is configured to control the intensity of light generated by the light source based on modulating the average power delivered to the light source in a given time period, without monitoring and/or regulating the voltage or current provided to the light source.
  • significantly streamlined circuits having fewer components, higher overall power efficiencies, and smaller space requirements are realized.
  • 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. 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 .
  • 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. As shown in Fig. 6 , 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). More specifically, 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

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Led Devices (AREA)
  • Semiconductor Lasers (AREA)

Claims (4)

  1. Eine Lichttreibereinrichtung (300), umfassend:
    einen Signalgenerator (310) zum Erzeugen eines Signals;
    einen Demultiplexer (320) zum Umwandeln des erzeugten Signals zu einem ersten Steuersignal und einem zweiten Steuersignal;
    eine erste Lichttreiberschaltung (330) gesteuert durch das erste Steuersignal und hat eine erste Leuchte (331); und
    eine zweite Lichttreiberschaltung (330) gesteuert durch das zweite Steuersignal und hat eine zweite Leuchte (331),
    dadurch gekennzeichnet, dass jedes der ersten und zweiten Steuersignale, die von dem Demultiplexer (320) konvertiert werden, zwischen einer hohen Level und einen niedrigen Level verlaufen, und das erste Steuersignal wird zu dem zweiten Steuersignal invertiert; und
    die erste Leuchte (331) und die zweite Leuchte (331) werden abwechselnd EIN / AUS geschalten gemäß dem ersten und dem zweiten Steuersignal, und
    der Demultiplexer (320) umfasst einen D-Flip-Flop (322) mit einem Dateneingabeterminal (D), einem Takterminal (CLK) zum Empfangen des erzeugten Signals, ein Ausgabeterminal (Q) zum Ausgeben des ersten Steuersignales und ein invertierendes Ausgabeterminal (Q') zum Ausgeben des zweiten Steuersignals, wobei das zweite Ausgangssignal an das Dateneingabeterminal (D) weitergeleitet wird, und die erste Lichttreiberschaltung (330) und die zweite Lichttreiberschaltung (330), werden jeweils von dem ersten Steuersignal und dem zweiten Steuersignal gesteuert.
  2. Die Lichttreibereinrichtung (300) nach Anspruch 1, dadurch gekennzeichnet, dass jedes des ersten Lichts (331) und des zweiten Lichts (331) ein erstes Terminal (332) hat, das mit einer ersten Spannung (VDD) und einem zweiten Terminal (334) verbunden ist, und jede der ersten und zweiten Lichttreibereinrichtungen (300) umfasst weiterhin:
    einen Schalter (333), der ein erstes Terminal (335) hat, das mit dem zweiten Terminal (334) verbunden ist, ein zweites Terminal (336), das mit einer zweiten Spannung (VSS) verbunden ist, und ein drittes Terminal (337), mit dem Demultiplexer (320) verbunden ist,
    wobei das dritte Terminal (337) des Schalters (333) der ersten Lichttreiberschaltung (330) das erste Steuersignal empfängt und das dritte Terminal (337) des Schalters (333) der zweiten Lichttreiberschaltung (330) das zweite Steuersignal empfängt.
  3. Die Lichttreibereinrichtung (300) nach Anspruch 2, dadurch gekennzeichnet, dass die erste und zweite Leuchte eine emittierende Dioden sind, der Signalgenerator (310) ist ein LED-Impulsgeber und der Schalter (333) ist ein MOS-Transistor; wobei die erste und die zweite Spannung (VDD, VSS) jeweils eine Stromversorgungsspannung und eine Masse sind; und wobei das erste Terminal (335) ein Drain/Senke ist, das zweite Terminal (336) eine Source/Quelle ist und das dritte Terminal (337) ein Gate ist.
  4. Die Lichttreibereinrichtung (300) nach Anspruch 1, dadurch gekennzeichnet, dass der Demultiplexer (320) eine erste Diode (D1) umfasst, die eine Anode (323) aufweist, verbunden mit dem Ausgangsterminal (Q) und eine Kathode (325) verbunden mit dem Taktterminal (CLK), und eine zweite Diode (D2), die eine Anode (327) hat, ist mit dem invertierenden Ausgabeterminal (Q') verbunden und eine Kathode (328) ist mit dem Taktterminal (CLK) verbunden.
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 EP1868420A2 (de) 2007-12-19
EP1868420A3 EP1868420A3 (de) 2008-12-03
EP1868420B1 true EP1868420B1 (de) 2014-11-26

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EP07110099.4A Active EP1868420B1 (de) 2006-06-13 2007-06-12 Lichtansteuerungsvorrichtung

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CN (1) CN101090595B (de)

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* 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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6850995B1 (en) 1999-01-25 2005-02-01 Canon Kabushiki Kaisha Control unit selectively connected with a first bus and a second bus for controlling a displaying process in parallel with a scanning process
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
EP3223587A3 (de) * 2004-03-15 2017-11-08 Philips Lighting North America Corporation Leistungsregelungsverfahren und -vorrichtung
EP1656001B1 (de) * 2004-11-03 2011-07-06 HTC Corporation Blinkleuchtensteuergerät

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Publication number Publication date
CN101090595B (zh) 2014-09-10
EP1868420A3 (de) 2008-12-03
CN101090595A (zh) 2007-12-19
EP1868420A2 (de) 2007-12-19

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