US20090072761A1 - Switching device for driving led array by pulse-shaped current modulation - Google Patents

Switching device for driving led array by pulse-shaped current modulation Download PDF

Info

Publication number
US20090072761A1
US20090072761A1 US12/265,354 US26535408A US2009072761A1 US 20090072761 A1 US20090072761 A1 US 20090072761A1 US 26535408 A US26535408 A US 26535408A US 2009072761 A1 US2009072761 A1 US 2009072761A1
Authority
US
United States
Prior art keywords
modulation
switching device
pulse
led array
inom
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.)
Abandoned
Application number
US12/265,354
Inventor
Johannes Hendrik Wessels
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.)
Signify Holding BV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to US12/265,354 priority Critical patent/US20090072761A1/en
Publication of US20090072761A1 publication Critical patent/US20090072761A1/en
Assigned to KONINKLIJKE PHILIPS N.V. reassignment KONINKLIJKE PHILIPS N.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Assigned to PHILIPS LIGHTING HOLDING B.V. reassignment PHILIPS LIGHTING HOLDING B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONINKLIJKE PHILIPS N.V.
Abandoned legal-status Critical Current

Links

Images

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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/305—Frequency-control circuits
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/33—Pulse-amplitude modulation [PAM]
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/335—Pulse-frequency modulation [PFM]
    • 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 invention relates to a switching device for driving a LED array.
  • WO 0020691 has disclosed a LED array serving as road marking.
  • the brightness of the relevant road marking as perceived by the traffic participant is considerably influenced by the local circumstances such as, for example, the time of day and prevailing weather conditions.
  • the perceived brightness is to be sufficiently great for a proper observance of the marking and, on the other hand, this brightness should remain limited to avoid a traffic participant's attention being distracted too much from other observations which are of importance for safe traffic handling, or to avoid dazzling.
  • a switching device for driving a LED array comprises means for driving a LED array with a pulse-shaped current of mean strength and for regulating the mean strength of the current flowing through the LED array by means of at least one of the following types of modulation: frequency modulation, pulse width modulation, and amplitude modulation of the pulse-shaped current. Regulation is preferably effected with a combination of two types of modulation of the pulse-shaped current.
  • pulse-shaped current regulation is highly advantageous because pulse-shaped regulation can be realized by modern electronic power supply circuits in a relatively simple way.
  • an extraordinarily wide control range for the mean current strength is realized.
  • the brightness of the marking formed by the LED array can be adapted well to the locally prevailing circumstances, which circumstances may be subject to major changes.
  • the control range may be advantageously increased by a combination of the three types of modulation.
  • a suitable form of controlling the brightness through regulation of the average or mean current (having a strength or level referred to as Inom) flowing through the LED array is based on a regulation by means of pulse-width modulation for a current strength in a range between the mean nominal current level Inom and 0.05 Inom, with amplitude modulation superimposed thereon so as to regulate the mean current strength Inom in a range from 0.05 Inom to 0.05*10 ⁇ 3 Inom.
  • the switching device as shown in FIG. 1 has an input JP 1 for connection to a supply source.
  • the general property of LEDs that there is only a small forward voltage across the LED in operating condition means that a low-voltage supply source may be used.
  • An output JP 2 is suitable for connecting the LED array to be operated.
  • a series combination of a LED D 2 and a resistor R 9 is connected in parallel to the output.
  • a semiconductor switching element Q 3 in parallel to the output and the series combination is present, a main electrode EQ 3 of which element is connected to a main electrode EQ 2 of a semiconductor switch Q 2 which is connected between input and output.
  • a control electrode GQ 2 of semiconductor switch Q 2 is connected to a control electrode GQ 3 of the semiconductor switching element Q 3 and to a shared control circuit.
  • the control electrodes GQ 2 and GQ 3 are connected to a center tap 2 of a potentiometer RIO, which is connected in series with a transistor QI.
  • the position of the center tap 2 of the potentiometer RIO determines the degree of current conduction through the semiconductor switch Q 2 and the semiconductor switching element Q 3 .
  • the series combination of potentiometer RIO and transistor QI constitutes an output of a pulse-width modulator formed around an opamp U 2 B.
  • An output 7 of opamp U 2 B is connected to a base of transistor QI.
  • Input 5 of the opamp U 2 B is connected to a capacitor C 5 as part of an oscillator, and input 6 of opamp U 2 B is connected to a variable voltage divider R 7 , R 6 , R 5 .
  • the time per cycle of the oscillator frequency during which the signal at output 7 turns transistor QI on or off respectively, can be varied by means of the 30 variable voltage divider, so that the pulse width of the current pulse is varied by the semiconductor switch Q 2 .
  • Capacitor C 5 , opamp U 2 A, and opamp U 2 B form part of an oscillation circuit in which the capacitor C 5 together with impedances R 4 and R 12 constitutes a voltage divider circuit.
  • R 4 is herein an adjustable resistor, which achieves that the frequency generated by the oscillation circuit can be adjusted and can therefore be varied. In consequence, the current pulse frequency will vary accordingly.
  • the opamps U 2 A and U 2 B are constituted by a single integrated circuit (IC) of the type TS393CN.
  • Transistor QI is of the type BC548C, semiconductor switch Q 2 of the type BC639, and semiconductor switching element Q 3 of the type BC640.
  • the oscillator circuit has a default frequency of 200 Hz.
  • Potentiometer RIO has a strength of 4.7 kfl and has a 100% control range.
  • the switching device is intended to be connected to a 15V DC supply source.
  • the switching device drives a LED array for road marking, which LED array comprises a total of 400 LEDs of the type Nichia NSPW300BS.
  • the supply is effected such that the mean current flowing through each LED of the array is 20 mA.
  • Brightness control down to a level corresponding to a mean current through each LED of 1 mA takes place exclusively by varying the voltage divider R 7 , R 6 , R 5 .
  • the pulse width is then modulated to a 2% duty cycle.
  • the setting of the potentiometer RIO is varied. When the complete control range of the potentiometer RIO is utilized, the mean current flowing through each LED can be reduced to 1 ⁇ A.

Abstract

A circuit drives an LED array and controls the brightness of the LED array by regulating the current flowing through the array. The LED array is driven by a pulse-shaped current of which the mean value is regulated with at least one or two of the following types of modulation: frequency modulation, pulse-width modulation, and amplitude modulation.

Description

  • This application is a continuation of U.S. patent application Ser. No. 10/504,139 filed on Aug. 10, 2004, which is a national stage application under 35 U.S.C. §371 of International Application No. PCT/IB2003/00418 filed on Feb. 6, 2003, which claims priority to European Application No. 02075627.6, filed on Feb. 14, 2002, all of which are hereby incorporated herein by reference.
  • The invention relates to a switching device for driving a LED array.
  • WO 0020691 has disclosed a LED array serving as road marking. The brightness of the relevant road marking as perceived by the traffic participant is considerably influenced by the local circumstances such as, for example, the time of day and prevailing weather conditions. On the one hand, the perceived brightness is to be sufficiently great for a proper observance of the marking and, on the other hand, this brightness should remain limited to avoid a traffic participant's attention being distracted too much from other observations which are of importance for safe traffic handling, or to avoid dazzling.
  • The invention provides a solution to the problem thus arisen. According to the invention, a switching device for driving a LED array is characterized in that the switching device comprises means for driving a LED array with a pulse-shaped current of mean strength and for regulating the mean strength of the current flowing through the LED array by means of at least one of the following types of modulation: frequency modulation, pulse width modulation, and amplitude modulation of the pulse-shaped current. Regulation is preferably effected with a combination of two types of modulation of the pulse-shaped current.
  • Since light generation of a LED is dependent on the current strength through the LED, pulse-shaped current regulation is highly advantageous because pulse-shaped regulation can be realized by modern electronic power supply circuits in a relatively simple way. By combining at least two kinds of modulation of the current flowing through the LED, an extraordinarily wide control range for the mean current strength is realized. In consequence, the brightness of the marking formed by the LED array can be adapted well to the locally prevailing circumstances, which circumstances may be subject to major changes. The control range may be advantageously increased by a combination of the three types of modulation.
  • A suitable form of controlling the brightness through regulation of the average or mean current (having a strength or level referred to as Inom) flowing through the LED array is based on a regulation by means of pulse-width modulation for a current strength in a range between the mean nominal current level Inom and 0.05 Inom, with amplitude modulation superimposed thereon so as to regulate the mean current strength Inom in a range from 0.05 Inom to 0.05*10−3 Inom.
  • The invention will be further explained with reference to a drawing of an embodiment of a switching device according to the invention.
  • The switching device as shown in FIG. 1 has an input JP1 for connection to a supply source. The general property of LEDs that there is only a small forward voltage across the LED in operating condition means that a low-voltage supply source may be used. An output JP2 is suitable for connecting the LED array to be operated. For a simple verification of the operation of the switching device, a series combination of a LED D2 and a resistor R9 is connected in parallel to the output.
  • A semiconductor switching element Q3 in parallel to the output and the series combination is present, a main electrode EQ3 of which element is connected to a main electrode EQ2 of a semiconductor switch Q2 which is connected between input and output. A control electrode GQ2 of semiconductor switch Q2 is connected to a control electrode GQ3 of the semiconductor switching element Q3 and to a shared control circuit.
  • The control electrodes GQ2 and GQ3 are connected to a center tap 2 of a potentiometer RIO, which is connected in series with a transistor QI. The position of the center tap 2 of the potentiometer RIO determines the degree of current conduction through the semiconductor switch Q2 and the semiconductor switching element Q3.
  • The series combination of potentiometer RIO and transistor QI constitutes an output of a pulse-width modulator formed around an opamp U2B. An output 7 of opamp U2B is connected to a base of transistor QI. Input 5 of the opamp U2B is connected to a capacitor C5 as part of an oscillator, and input 6 of opamp U2B is connected to a variable voltage divider R7, R6, R5. The time per cycle of the oscillator frequency during which the signal at output 7 turns transistor QI on or off respectively, can be varied by means of the 30 variable voltage divider, so that the pulse width of the current pulse is varied by the semiconductor switch Q2.
  • Capacitor C5, opamp U2A, and opamp U2B form part of an oscillation circuit in which the capacitor C5 together with impedances R4 and R12 constitutes a voltage divider circuit. R4 is herein an adjustable resistor, which achieves that the frequency generated by the oscillation circuit can be adjusted and can therefore be varied. In consequence, the current pulse frequency will vary accordingly.
  • In a practical realization, the opamps U2A and U2B are constituted by a single integrated circuit (IC) of the type TS393CN. Transistor QI is of the type BC548C, semiconductor switch Q2 of the type BC639, and semiconductor switching element Q3 of the type BC640. The oscillator circuit has a default frequency of 200 Hz. Potentiometer RIO has a strength of 4.7 kfl and has a 100% control range. The switching device is intended to be connected to a 15V DC supply source. The switching device drives a LED array for road marking, which LED array comprises a total of 400 LEDs of the type Nichia NSPW300BS. In nominal condition the supply is effected such that the mean current flowing through each LED of the array is 20 mA. Brightness control down to a level corresponding to a mean current through each LED of 1 mA takes place exclusively by varying the voltage divider R7, R6, R5. The pulse width is then modulated to a 2% duty cycle. For further reduction of the brightness, the setting of the potentiometer RIO is varied. When the complete control range of the potentiometer RIO is utilized, the mean current flowing through each LED can be reduced to 1 μA.

Claims (7)

1. A switching device for driving an LED array, the switching device comprising a drive generator configured to modulate a mean strength of a current provided to the LED array by a first modulation type, a second modulation type, and a third modulation type.
2. The switching device of claim 1, wherein the first modulation type is pulse-width modulation, the second modulation type is amplitude modulation, and the third modulation type is frequency modulation.
3. The switching device of claim 1, wherein the first modulation type is configured to reduce the mean strength from Inom to 0.05 Inom, the second modulation type is configured to reduce the mean strength to less than 0.05 Inom, and the third modulation type is configured to reduce the mean strength to 0.05*10−3 Inom.
4. The switching device of claim 3, wherein the first modulation type is pulse-width modulation, the second modulation type is amplitude modulation, and the third modulation type is frequency modulation.
5. A switching device for driving an LED array, wherein the switching device comprises a drive generator configured to provide a current having a mean strength which is reducible from Inom to 0.05*10−3 Inom using three different types of modulation.
6. The switching device of claim 5, wherein the three different types of modulation include pulse-width modulation, amplitude modulation, and frequency modulation.
7. The switching device of claim 6, wherein the pulse-width modulation is configured to reduce the mean strength from Inom to 0.05 Inom, the amplitude modulation is configured to reduce the mean strength to less than 0.05 Inom, and the frequency modulation is configured to reduce the mean strength to 0.05*10−3 Inom.
US12/265,354 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation Abandoned US20090072761A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/265,354 US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP02075627 2002-02-14
EP02075627.6 2002-02-14
US10/504,139 US7463070B2 (en) 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation
PCT/IB2003/000418 WO2003069958A1 (en) 2002-02-14 2003-02-06 Switching device for driving a led array
US12/265,354 US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
PCT/IB2003/000418 Continuation WO2003069958A1 (en) 2002-02-14 2003-02-06 Switching device for driving a led array
US10/504,139 Continuation US7463070B2 (en) 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation

Publications (1)

Publication Number Publication Date
US20090072761A1 true US20090072761A1 (en) 2009-03-19

Family

ID=27675721

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/504,139 Expired - Lifetime US7463070B2 (en) 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation
US12/265,354 Abandoned US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10/504,139 Expired - Lifetime US7463070B2 (en) 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation

Country Status (10)

Country Link
US (2) US7463070B2 (en)
EP (1) EP1479270B1 (en)
JP (1) JP4633363B2 (en)
KR (1) KR100960825B1 (en)
CN (1) CN100477868C (en)
AT (1) ATE332622T1 (en)
AU (1) AU2003201751A1 (en)
DE (1) DE60306624T2 (en)
TW (1) TWI279764B (en)
WO (1) WO2003069958A1 (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080174997A1 (en) * 2004-05-18 2008-07-24 Zampini Thomas L Collimating and Controlling Light Produced by Light Emitting Diodes
US20090085500A1 (en) * 2007-09-24 2009-04-02 Integrated Illumination Systems, Inc. Systems and methods for providing an oem level networked lighting system
US20090284747A1 (en) * 2008-05-16 2009-11-19 Charles Bernard Valois Non-Contact Selection and Control of Lighting Devices
US20100307075A1 (en) * 2006-04-24 2010-12-09 Zampini Thomas L Led light fixture
US8278845B1 (en) 2011-07-26 2012-10-02 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US8436553B2 (en) 2007-01-26 2013-05-07 Integrated Illumination Systems, Inc. Tri-light
US8567982B2 (en) 2006-11-17 2013-10-29 Integrated Illumination Systems, Inc. Systems and methods of using a lighting system to enhance brand recognition
US8585245B2 (en) 2009-04-23 2013-11-19 Integrated Illumination Systems, Inc. Systems and methods for sealing a lighting fixture
US8894437B2 (en) 2012-07-19 2014-11-25 Integrated Illumination Systems, Inc. Systems and methods for connector enabling vertical removal
US9066381B2 (en) 2011-03-16 2015-06-23 Integrated Illumination Systems, Inc. System and method for low level dimming
US9379578B2 (en) 2012-11-19 2016-06-28 Integrated Illumination Systems, Inc. Systems and methods for multi-state power management
US9420665B2 (en) 2012-12-28 2016-08-16 Integration Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9485814B2 (en) 2013-01-04 2016-11-01 Integrated Illumination Systems, Inc. Systems and methods for a hysteresis based driver using a LED as a voltage reference
US9521725B2 (en) 2011-07-26 2016-12-13 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US9609720B2 (en) 2011-07-26 2017-03-28 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US9967940B2 (en) 2011-05-05 2018-05-08 Integrated Illumination Systems, Inc. Systems and methods for active thermal management
US10030844B2 (en) 2015-05-29 2018-07-24 Integrated Illumination Systems, Inc. Systems, methods and apparatus for illumination using asymmetrical optics
US10060599B2 (en) 2015-05-29 2018-08-28 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures
US10159132B2 (en) 2011-07-26 2018-12-18 Hunter Industries, Inc. Lighting system color control
US10228711B2 (en) 2015-05-26 2019-03-12 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10874003B2 (en) 2011-07-26 2020-12-22 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US10918030B2 (en) 2015-05-26 2021-02-16 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11917740B2 (en) 2011-07-26 2024-02-27 Hunter Industries, Inc. Systems and methods for providing power and data to devices

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050044865A (en) 2002-05-08 2005-05-13 포세온 테크날러지 인코퍼레이티드 High efficiency solid-state light source and methods of use and manufacture
JP2004235498A (en) * 2003-01-31 2004-08-19 Anden Light emitting diode controller
DE102004010942B3 (en) * 2004-03-05 2005-10-13 Kwl-Lighting Gmbh Control device and control process for the control of luminaries features an electrical circuit that reduces the perception of the brightness change
US7542257B2 (en) 2004-09-10 2009-06-02 Philips Solid-State Lighting Solutions, Inc. Power control methods and apparatus for variable loads
JP4306657B2 (en) * 2004-10-14 2009-08-05 ソニー株式会社 Light emitting element driving device and display device
KR101288758B1 (en) * 2004-12-30 2013-07-23 포세온 테크날러지 인코퍼레이티드 Methods and systems relating to light sources for use in industrial processes
ES2298987T3 (en) * 2005-02-02 2008-05-16 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh METHOD AND SYSTEM TO DIMATE SOURCES OF LIGHT.
KR100761780B1 (en) * 2005-03-10 2007-09-28 네오뷰코오롱 주식회사 Organic Light Emitting Diode driving method and device using peak current
EP1734793B1 (en) * 2005-06-14 2008-04-16 Novaled AG Method and device for operating an OLED device
DE502005004675D1 (en) 2005-12-21 2008-08-21 Novaled Ag Organic component
KR100691628B1 (en) * 2006-04-07 2007-03-12 삼성전기주식회사 Apparatus for driving led arrays
US7746300B2 (en) * 2006-05-05 2010-06-29 Linear Technology Corporation Circuit and methodology for supplying pulsed current to a load, such as a light emitting diode
DE102006032071B4 (en) * 2006-07-11 2008-07-10 Austriamicrosystems Ag Control circuit and method for controlling light emitting diodes
DE102007010039A1 (en) * 2007-03-01 2008-09-04 Osram Gesellschaft mit beschränkter Haftung Optoelectronic device for emission of electromagnetic radiation with controlled radiation intensity, has optoelectronic element which produces electromagnetic radiation during operation
DE102007052434A1 (en) * 2007-11-02 2009-05-07 Hella Kgaa Hueck & Co. Method for dimming a light-emitting diode arrangement of a motor vehicle
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US7712918B2 (en) 2007-12-21 2010-05-11 Altair Engineering , Inc. Light distribution using a light emitting diode assembly
DE102008008181A1 (en) * 2008-02-08 2009-08-13 Audi Ag Method for operating a motor vehicle lighting device
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US8994615B2 (en) 2008-06-06 2015-03-31 Dolby Laboratories Licensing Corporation Apparatus and methods for driving solid-state illumination sources
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
EP2446715A4 (en) 2009-06-23 2013-09-11 Ilumisys Inc Illumination device including leds and a switching power control system
DE102009040283A1 (en) * 2009-09-04 2011-03-10 Tridonic Ag Operation of pulse modulated LEDs
US8466628B2 (en) 2009-10-07 2013-06-18 Lutron Electronics Co., Inc. Closed-loop load control circuit having a wide output range
CA2716022C (en) * 2010-09-30 2019-03-12 Light-Based Technologies Incorporated Apparatus and methods for supplying power
EP2553320A4 (en) 2010-03-26 2014-06-18 Ilumisys Inc Led light with thermoelectric generator
EP2553316B8 (en) 2010-03-26 2015-07-08 iLumisys, Inc. Led light tube with dual sided light distribution
WO2011119958A1 (en) 2010-03-26 2011-09-29 Altair Engineering, Inc. Inside-out led bulb
DE102010015125A1 (en) * 2010-04-16 2011-10-20 Hella Kgaa Hueck & Co. Method for controlling a luminous flux of a lighting device with a number of semiconductor illuminants, which is set up for the identification and marking of traffic areas of airports
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
EP2593714A2 (en) 2010-07-12 2013-05-22 iLumisys, Inc. Circuit board mount for led light tube
AU2011281033A1 (en) 2010-07-22 2013-02-07 Independence Led Lighting, Llc Light engine device with direct to linear system driver
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US8680787B2 (en) 2011-03-15 2014-03-25 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US8803437B2 (en) 2011-09-25 2014-08-12 Wen-Hsiung Hsieh Switching mode pulsed current supply for driving LEDS
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
WO2014008463A1 (en) 2012-07-06 2014-01-09 Ilumisys, Inc. Power supply assembly for led-based light tube
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US8810147B2 (en) 2012-07-15 2014-08-19 Wen-Hsiung Hsieh Method and circuit for driving LEDs with a pulsed current
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
DE102013105463B3 (en) * 2013-05-28 2014-11-06 Vossloh-Schwabe Deutschland Gmbh Operating device and method for operating a dimmable lamp arrangement
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
WO2015112437A1 (en) 2014-01-22 2015-07-30 Ilumisys, Inc. Led-based light with addressed leds
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
DE202015102108U1 (en) * 2015-04-28 2016-08-01 Zumtobel Lighting Gmbh Operating device for operating at least one LED and arrangement for lighting with a control gear and at least one LED
US10161568B2 (en) 2015-06-01 2018-12-25 Ilumisys, Inc. LED-based light with canted outer walls
US10801714B1 (en) 2019-10-03 2020-10-13 CarJamz, Inc. Lighting device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998043A (en) * 1973-12-26 1976-12-21 Citizen Watch Co., Ltd. Electric timepiece for displaying the operating condition thereof
US5736881A (en) * 1994-12-05 1998-04-07 Hughes Electronics Diode drive current source
US6333605B1 (en) * 1999-11-02 2001-12-25 Energy Savings, Inc. Light modulating electronic ballast
US6388398B1 (en) * 2001-03-20 2002-05-14 Koninklijke Philips Electronics N.V. Mixed mode control for ballast circuit
US20030085749A1 (en) * 2000-02-03 2003-05-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
US6580309B2 (en) * 2000-02-03 2003-06-17 Koninklijke Philips Electronics N.V. Supply assembly for a LED lighting module
US20030127995A1 (en) * 2002-01-10 2003-07-10 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6686703B2 (en) * 2002-01-10 2004-02-03 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6836079B2 (en) * 2000-03-31 2004-12-28 Sam-Pyo Hong Light emitting lamp
US20070291483A1 (en) * 2001-05-30 2007-12-20 Color Kinetics Incorporated Controlled lighting methods and apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313227A (en) * 1979-01-29 1982-01-26 Texas Instruments Incorporated Light energy information transmission system
US5671003A (en) * 1991-11-04 1997-09-23 Eastman Kodak Company Hybrid digital image printer with halftone gray scale capability
JP2843191B2 (en) * 1992-01-30 1999-01-06 富士通株式会社 Electronic device drive circuit
US5325383A (en) * 1993-05-17 1994-06-28 Eastman Kodak Company Laser diode operated in hybrid modulation modes
JPH0777424A (en) * 1993-09-07 1995-03-20 Wacom Co Ltd Optical surveying instrument
US5783909A (en) 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
DE19732828C2 (en) * 1997-07-30 2001-01-18 Siemens Ag Circuit arrangement for driving a light-emitting diode array
ES2273520T3 (en) 1999-05-20 2007-05-01 Koninklijke Philips Electronics N.V. SYSTEM AND COMPLEX FOR ROAD SIGNALING.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998043A (en) * 1973-12-26 1976-12-21 Citizen Watch Co., Ltd. Electric timepiece for displaying the operating condition thereof
US5736881A (en) * 1994-12-05 1998-04-07 Hughes Electronics Diode drive current source
US6333605B1 (en) * 1999-11-02 2001-12-25 Energy Savings, Inc. Light modulating electronic ballast
US20030085749A1 (en) * 2000-02-03 2003-05-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
US6580309B2 (en) * 2000-02-03 2003-06-17 Koninklijke Philips Electronics N.V. Supply assembly for a LED lighting module
US6836079B2 (en) * 2000-03-31 2004-12-28 Sam-Pyo Hong Light emitting lamp
US6388398B1 (en) * 2001-03-20 2002-05-14 Koninklijke Philips Electronics N.V. Mixed mode control for ballast circuit
US20070291483A1 (en) * 2001-05-30 2007-12-20 Color Kinetics Incorporated Controlled lighting methods and apparatus
US20030127995A1 (en) * 2002-01-10 2003-07-10 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6686703B2 (en) * 2002-01-10 2004-02-03 Koninklijke Philips Electronics N.V. High frequency electronic ballast

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469542B2 (en) 2004-05-18 2013-06-25 II Thomas L. Zampini Collimating and controlling light produced by light emitting diodes
US20080174997A1 (en) * 2004-05-18 2008-07-24 Zampini Thomas L Collimating and Controlling Light Produced by Light Emitting Diodes
US20100307075A1 (en) * 2006-04-24 2010-12-09 Zampini Thomas L Led light fixture
US8070325B2 (en) 2006-04-24 2011-12-06 Integrated Illumination Systems LED light fixture
US8567982B2 (en) 2006-11-17 2013-10-29 Integrated Illumination Systems, Inc. Systems and methods of using a lighting system to enhance brand recognition
US8436553B2 (en) 2007-01-26 2013-05-07 Integrated Illumination Systems, Inc. Tri-light
US20090085500A1 (en) * 2007-09-24 2009-04-02 Integrated Illumination Systems, Inc. Systems and methods for providing an oem level networked lighting system
US8742686B2 (en) 2007-09-24 2014-06-03 Integrated Illumination Systems, Inc. Systems and methods for providing an OEM level networked lighting system
US20090284169A1 (en) * 2008-05-16 2009-11-19 Charles Bernard Valois Systems and Methods for Communicating in a Lighting Network
US20100084992A1 (en) * 2008-05-16 2010-04-08 Charles Bernard Valois Intensity control and color mixing of light emitting devices
US8243278B2 (en) 2008-05-16 2012-08-14 Integrated Illumination Systems, Inc. Non-contact selection and control of lighting devices
US8264172B2 (en) 2008-05-16 2012-09-11 Integrated Illumination Systems, Inc. Cooperative communications with multiple master/slaves in a LED lighting network
US8255487B2 (en) 2008-05-16 2012-08-28 Integrated Illumination Systems, Inc. Systems and methods for communicating in a lighting network
US20090284747A1 (en) * 2008-05-16 2009-11-19 Charles Bernard Valois Non-Contact Selection and Control of Lighting Devices
US20090284184A1 (en) * 2008-05-16 2009-11-19 Integrated Illumination Systems, Inc. Cooperative Communications with Multiple Master/Slaves in a Led Lighting Network
US8585245B2 (en) 2009-04-23 2013-11-19 Integrated Illumination Systems, Inc. Systems and methods for sealing a lighting fixture
US9066381B2 (en) 2011-03-16 2015-06-23 Integrated Illumination Systems, Inc. System and method for low level dimming
US9967940B2 (en) 2011-05-05 2018-05-08 Integrated Illumination Systems, Inc. Systems and methods for active thermal management
US10159132B2 (en) 2011-07-26 2018-12-18 Hunter Industries, Inc. Lighting system color control
US8278845B1 (en) 2011-07-26 2012-10-02 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US11917740B2 (en) 2011-07-26 2024-02-27 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US11503694B2 (en) 2011-07-26 2022-11-15 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US10874003B2 (en) 2011-07-26 2020-12-22 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US9521725B2 (en) 2011-07-26 2016-12-13 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US10375793B2 (en) 2011-07-26 2019-08-06 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US9609720B2 (en) 2011-07-26 2017-03-28 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US8710770B2 (en) 2011-07-26 2014-04-29 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US8894437B2 (en) 2012-07-19 2014-11-25 Integrated Illumination Systems, Inc. Systems and methods for connector enabling vertical removal
US9379578B2 (en) 2012-11-19 2016-06-28 Integrated Illumination Systems, Inc. Systems and methods for multi-state power management
US9578703B2 (en) 2012-12-28 2017-02-21 Integrated Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9420665B2 (en) 2012-12-28 2016-08-16 Integration Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9485814B2 (en) 2013-01-04 2016-11-01 Integrated Illumination Systems, Inc. Systems and methods for a hysteresis based driver using a LED as a voltage reference
US10228711B2 (en) 2015-05-26 2019-03-12 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10918030B2 (en) 2015-05-26 2021-02-16 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11229168B2 (en) 2015-05-26 2022-01-25 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11771024B2 (en) 2015-05-26 2023-10-03 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10060599B2 (en) 2015-05-29 2018-08-28 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures
US10030844B2 (en) 2015-05-29 2018-07-24 Integrated Illumination Systems, Inc. Systems, methods and apparatus for illumination using asymmetrical optics
US10584848B2 (en) 2015-05-29 2020-03-10 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures

Also Published As

Publication number Publication date
US7463070B2 (en) 2008-12-09
KR20040096566A (en) 2004-11-16
DE60306624D1 (en) 2006-08-17
TWI279764B (en) 2007-04-21
CN100477868C (en) 2009-04-08
KR100960825B1 (en) 2010-06-07
WO2003069958A1 (en) 2003-08-21
JP2005518102A (en) 2005-06-16
ATE332622T1 (en) 2006-07-15
TW200303512A (en) 2003-09-01
EP1479270A1 (en) 2004-11-24
EP1479270B1 (en) 2006-07-05
JP4633363B2 (en) 2011-02-16
DE60306624T2 (en) 2007-06-21
AU2003201751A1 (en) 2003-09-04
US20050088209A1 (en) 2005-04-28
CN1633827A (en) 2005-06-29

Similar Documents

Publication Publication Date Title
US7463070B2 (en) Switching device for driving LED array by pulse-shaped current modulation
JP4249900B2 (en) Method and apparatus for dimming backlight lamp of liquid crystal display device
US7496297B2 (en) LED system for illumination and data transmission
EP1229764A2 (en) Light emitting diode driving circuit
US9451673B2 (en) Device for controlling a lighting device
JP2004048011A (en) Power feeder circuit for light emitting diode array and liquid crystal display unit
JP2009527894A5 (en)
JP2009527894A (en) Circuit arrangement for modulating LED and method of operating LED
WO2016049671A1 (en) Switched direct ac driver for leds
US7045967B2 (en) Multi-lamp actuating facility
US11019702B2 (en) Driver and method for driving at least two sets of solid state lighting elements
US10128654B2 (en) Method and apparatus for correcting for power harmonics
JP2002056996A (en) Liquid crystal back light control method
US7279853B2 (en) Fluorescent lamp dimmer control
CN109863702B (en) Current modulation circuit, driving circuit and method for driving lighting load by using current modulation
US20140145645A1 (en) Step-dimming led driver and system
CN115176524A (en) LED lighting system and control method
WO1999014988A1 (en) Group dimming system for gas discharge lamps
US20090123161A1 (en) Led system for illumination and data transmission
CN117062273A (en) Novel two-wire dimming LED controller
CA3116919A1 (en) System and method for repurposing 120vac wiring architecture to retrofitable low voltage dc power 2-wire led dimming

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: KONINKLIJKE PHILIPS N.V., NETHERLANDS

Free format text: CHANGE OF NAME;ASSIGNOR:KONINKLIJKE PHILIPS ELECTRONICS N.V.;REEL/FRAME:039428/0606

Effective date: 20130515

AS Assignment

Owner name: PHILIPS LIGHTING HOLDING B.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KONINKLIJKE PHILIPS N.V.;REEL/FRAME:040060/0009

Effective date: 20160607