US20060192502A1 - Dimmer circuit for led - Google Patents

Dimmer circuit for led Download PDF

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Publication number
US20060192502A1
US20060192502A1 US11059960 US5996005A US2006192502A1 US 20060192502 A1 US20060192502 A1 US 20060192502A1 US 11059960 US11059960 US 11059960 US 5996005 A US5996005 A US 5996005A US 2006192502 A1 US2006192502 A1 US 2006192502A1
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Prior art keywords
circuit
dimmer
resistor
connected
load
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Granted
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US11059960
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US7102902B1 (en )
Inventor
Emery Brown
Pervaz Lodhie
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LEDTRONICS
LEDtronics Inc
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LEDtronics Inc
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0806Structural details of the circuit
    • H05B33/0809Structural details of the circuit in the conversion stage
    • H05B33/0815Structural details of the circuit in the conversion stage with a controlled switching regulator
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B39/00Circuit arrangements or apparatus for operating incandescent light sources and not adapted to a particular application
    • H05B39/04Controlling
    • H05B39/041Controlling the light-intensity of the source
    • H05B39/044Controlling the light-intensity of the source continuously
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00Electricity: power supply or regulation systems
    • Y10S323/905Lamp dimmer structure

Abstract

The AC output from a source is rectified and applied to a resistor/Zener diode circuit connection which determines the magnitude of the rectified voltage applied via a circuit to a first MOSFET device. The inverted output of the first MOSFET device is applied to the gate electrode of a second MOSFET device in a manner such that the second MOSFET device is ON even when the AC output passes through zero. The output of the second MOSFET device is connected to a resistor which determines the magnitude of the load applied to the dimmer.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention provides a simplified and inexpensive circuit for dimming light emitting diodes utilizing a conventional TRIAC AC dimmer.
  • 2. Background of the Invention
  • Circuits for dimming incandescent bulbs have been available in the prior art. For example, U.S. Pat. No. 6,566,819 to Wolff discloses a light control/dimmer system that can be touch operated and includes a programmable timer that controls the light attached thereto by switching the device to an “OFF” position after a predetermined time period. In most dimmers, the current will not go to zero unless there is a minimum load provided by the device being dimmed. Thus, the dimmer device typically has a minimum load placed on it of approximately 5 watts.
  • Light emitting diodes (“LEDs) that provide a specific, focused light output of a predetermined wavelength have been available for a number of years. U.S. Pat. No. 6,598,996 to Lodhie sets forth, inter alia, the advantages of using LEDs when compared to conventional incandescent bulbs. LEDs, in addition to replacing incandescent bulbs used in motor vehicles, have also been used for signage and other display systems. The illumination output from LEDs typically have a single intensity and are not easily adapted to having multiple levels of intensity and thus to dimming. Specifically, LEDs do not provide the minimum load necessary when used with conventional dimmers. Those LED circuits with dimmer devices draw higher power from the AC input source which, in turn, generates relatively higher heat levels which is undesirable in LED based circuits.
  • What is desired is to provide a circuit which enables LEDs to be dimmed and wherein the power/heat levels generated during LED use is substantially reduced.
  • SUMMARY OF THE INVENTION
  • The present invention provides a circuit that supplies a specialized load to a conventional AC dimmer which, in turn, controls a LED device. The circuit draws limited power from the energy source and also operates in a manner such that the heat generated by the circuit is substantially reduced.
  • In particular, the AC output from a source is rectified and applied to a resistor/Zener diode circuit connection which determines the magnitude of the rectified voltage applied via a circuit to a first MOSFET device. The inverted output of the first MOSFET device is applied to the gate electrode of a second MOSFET device in a manner such that the second MOSFET device is ON even when the AC output passes through zero. The output of the second MOSFET device is connected to a resistor which determines the magnitude of the load applied to the dimmer.
  • DESCRIPTION OF THE DRAWINGS
  • For a better understanding of the present invention as well as other objects and further features thereof, reference is made to the following description which is to be read in conjunction with the accompanying drawing wherein:
  • FIG. 1 is a block diagram of the dimmer system using the circuit of the present invention;
  • FIG. 2 illustrates the dimming circuit of the present invention; and
  • FIG. 3 illustrates how the AC input waveform is acted upon by the dimming system of the present invention.
  • DESCRIPTION OF THE INVENTION
  • Referring to FIG. 1, a block diagram of the system 10 in which the circuit 22 of the present invention is utilized is illustrated.
  • The AC home power source 12 provides output leads 14 (the “hot” lead) and 16 (“neutral”), lead 14 being coupled to a conventional dimmer 18. The output lead 20 from dimmer 18, corresponding to hot lead 14 is coupled to a first input of circuit 22 of the present invention, neutral lead 16 being coupled to a second input of circuit 22. In the embodiment illustrated, the output of circuit 22 is coupled to Edison base socket 24 having a LED bulb 26 inserted therein. Although only a single LED bulb 26 is shown, a plurality of such LED bulbs can be placed in parallel across circuit 22. In an alternate arrangement, circuit 22 can be combined with an Edison base and the resulting combination then inserted into a conventional socket, thus eliminating the necessity of a separate wiring connection for circuit 22.
  • As will be set forth hereinafter in more detail, circuit 22 provides a technique for providing a varying load to the dimmer circuit 18 and absorbing leakage current therefrom, thus enabling the proper dimming of LED devices with conventional dimmers.
  • Conventional dimming works by controlling the amount of power furnished to the incandescent bulb; the greater the power applied to the bulb, the more intense the generated illumination; the lower the power applied to the bulb, the less intense the generated illumination. As shown in FIG. 3, this is accomplished by turning on the AC waveform generated by source 12 at different times during the waveform cycle. Specifically, waveform 37 illustrates the “full off” state (i.e. output power from the dimmer 18 is zero since the dimmer triac is not triggered), waveform 39 illustrates the triac turn-on times (“dim” status), waveform 40 illustrates the triac turn-on timer (“bright status) and waveform 38 illustrates when the triac is continuously triggered (“turned-on” status). As noted hereinabove, incandescent bulbs provide a minimum load when used with conventional dimmers. Since LEDs consume so little power and actually will turn completely off as the waveform voltage goes lower, a proper dimmer load is not provided. The dimmer circuit 18 controls the waveform zero crossing time with a triac but without a load the triac is not completely turned off thereby not allowing the LEDs to be properly dimmed up or down. Without a load, the leakage current from the triac will cause the LEDs to glow even when dimmed or to flicker off without dimming. A reasonable solution would be to place a load resistor in parallel with the LEDs but it would draw 3-5 watts or more of power thereby generating 3-5 watts or more or useless heat. Using the above procedure to dim LED's is impractical since one of the virtues of using LEDs in an illumination circuit is that low heat levels are generated and low power levels are consumed. The circuit as described hereinafter with reference to FIG. 2 eliminates this problem by providing a mechanism of providing a load only when it is necessary during the input AC waveform so the triac dimmer will function properly although the total power used, and therefore the total heat generated, is minimized thereby maintaining significantly lower circuit power levels.
  • Referring now to FIG. 2, the hot terminal 20 output from dimmer 18 is coupled to node 30 of full wave bridge rectifier 32 via fuse F1 and neutral lead 16 is coupled to node 34 of rectifier 32. The positive output 33 from rectifier 32 is coupled to the cathode of Zener diode ZD1 and a first terminal of resistor R4. The anode of Zener diode ZD1 is connected to one terminal of resistor R2, the other terminal of resistor R2 being connected to one terminal of resistor R1. The connection node 36 between resistors R1 and R2 is connected to the cathode of Zener diode ZD2 and to one terminal of resistor R3, the other terminal of resistor R3 being connected to the gate electrode of MOSFET Q1. The drain electrode of MOSFET Q1 is coupled to the cathode of signal diode D1 and Zener diode ZD3 and one terminal of resistor R6. The anode of diode D1 is connected to node 33 of rectifier 32 via resistor R4. The anode of diode D1 is also connected to a first terminal of resistor R5. The anode of Zener diode ZD3 is connected to the source electrode of MOSFET Q2, a second terminal of resistor R5, the source terminal of MOSFET Q1, the anode of Zener diode ZD2 and a second terminal of resistor of R1 which are directly coupled to node 35. The other terminal of resistor R6 is connected to the gate electrode of MOSFET Q2. The drain electrode of MOSFET Q2 is coupled to node 33 of rectifier 32 drain via resistor R7.
  • Typical values of the components shown in FIG. 2 are as follows:
      • D1—15V, 1.5W
      • R22—910 Kohms, ¼ W
      • R1—110 Kohms, ¼ W
      • ZD2—9.1V, 1 W
      • R3—10 ohms, ¼ W
      • Q1—IRFD210 (200V, 0.6 A)
      • R4—200 Kohms, ¼ W
      • R5—91 Kohms, ¼ W
      • D1—IN 4148
      • ZD3—1N 4148
      • R6—10 ohms, ¼ W
      • Q2—IRFR9N20N (200V, 9.4 A)
      • R7—3.0 Kohms, ½ W
  • (the value of resistor R7, in accordance with the teachings of the invention, is adjustable and depends on the required dimmer load and can vary up to 9 Kohms and 1 W).
  • All the above components are available from Digi-Key Corporation, Thief River Falls, Minn.
  • In operation, energy source 12 provides a live, or hot, AC output on leads 20 and a ground voltage on neutral leads 16.
  • The AC output is coupled to full wave rectifier bridge circuit 32, the output of circuit 32 at terminals 33 and 35 being a series of full wave rectified sine waves of a single (positive) polarity (waveform 41, FIG. 3). The output of circuit 32 is applied across Zener diode ZD1 and resistors R1 and R2 and functions to provide a window such that when the voltage thereacross goes above a predetermined magnitude such as 10 volts, Zener diode ZD2 and resistor R3 cooperate to turn on MOSFET Q1. Q1 inverts the input thereto and the inverted output is applied to the input of MOSFET Q2 to apply a bias thereto and, as a result, turn on Q2. Resistor R6 enables a sufficient amount of residual charge to be applied to the gate electrode of Q2 to keep Q2 on even though the input power drops to zero. Thus, Q2 is maintained on when the input AC voltage is in the range between −10V to +10V (waveform 42, FIG. 3) and applies a load via resistor R7 across bridge rectifier 32 which, in turn, applies a load across lines 16 and 20. When the voltage is greater than 10 volts and regardless of polarity, the load is put into a high impedance state thereby removing the load.
  • In effect, the required dimmer load is provided to the dimmer at the needed time and removed when it would have no effect except for drawing power, thereby creating the proper dimmer load but only allowing a very low wattage to be added to the dimming circuit.
  • It should be noted that the circuit described in FIG. 2 can be used in a system having both LED and incandescent bulbs. Even though the incandescent bulbs provide a load, the LEDs will respond to the circuit as described hereinabove, and dim better than using the incandescent bulbs for a load. The incandescent bulbs used with this circuit will work as normal, in effect not responding to the circuit.
  • In summary, the load for resistor R7 is coupled to the dimmer circuit 18 by being shorted across the dimmer output. When the MOSFET Q2 conducts it becomes, in essence, a piece of wire. When MOSFET Q2 conducts it therefore puts the load resistor R7 directly across the output of the dimmer. The rectifier does not interfere with the action of the load resistor R7 but since the MOSFET Q2 is used to turn a polarized signal off and on, the rectifier is necessary to assure that only a positive going power signal is flowing through the MOSFET Q2 and the load resistor R7. The dimmer circuit 18 output only sees the equivalent of a simple load resistor across it.
  • As noted hereinabove, an AC dimmer device requires a load to operate properly and most such dimmers operate using a triac. Although a triac is an inexpensive component that works well for AC dimming, it causes problems when used with LEDs.
  • First, there is a current leakage through the triac even when the triac is in the off mode. This causes the leakage current to light up an LED even when such small leakage current would not light an incandescent bulb.
  • In addition, the triac is triggered by its dimmer circuitry, and once triggered, the triac continues to conduct until the current through it stops. This does not work with DC circuits (used with LED circuits) because the current never stops but on an AC circuit the current goes to zero every time the power goes to zero (120 times a second on a standard 60 Hz power line). However, most dimmers require a minimum load to draw power out of the dimmer circuit to enable the triac to turn off properly so that the incandescent bulb would be illuminated at the right time. The dimmer does not operate properly without a load and the circuit of the present invention supplies a load at the right time without the waste of power which would occur using a power load resistor.
  • While the invention has been described with reference to its preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its essential teachings.

Claims (6)

  1. 1. A circuit adapted for use with a dimmer wherein a predetermined variable electrical load is made available to said dimmer, an AC source applying power to said circuit comprising:
    means for coupling the output of said AC dimmer to a rectifier;
    a first Zener diode having an anode and first and second resistors connected in series, said series connected components being in turn connected in parallel with said rectifier;
    a second Zener diode having an anode and cathode, said second Zener diode connected in parallel with second resistor, the cathode of said second Zener diode being connected to the node between the first and second resistors;
    a third resistor connected between said second Zener diode cathode and the gate electrode of a first MOSFET device, the drain electrode of said first MOSFET device being coupled to the cathode of a first diode, a third Zener diode and the sixth resistor;
    a fourth and fifth resistor connected in series, said series connection in turn connected in parallel with said rectifier; the anode of said first Zener diode being connected to the junction of said fourth and fifth resistor; and
    a sixth resistor connected to the base electrode of a second MOSFET device having a drain electrode, the drain electrode of said second MOSFET device being connected to the cathode of said first Zener diode via a seventh resistor, said seventh resistor and second MOSFET cooperating to apply said electrical load to said dimmer.
  2. 2. The circuit of claim 1 wherein said second MOSFET device is activated during the time period when the power applied to said circuit by said AC source is substantially between +10 volts and zero volts and between −10 volts and zero volts.
  3. 3. The circuit of claim 2 wherein the value of said seventh resistor is determined by the dimmer load required during the time period when power is applied to the circuit by said AC source.
  4. 4. The circuit of claim 3 wherein the output of said dimmer is coupled to a LED illumination device.
  5. 5. A dimmer system for controlling the illumination output form a LED device comprising:
    means for generating an AC waveform;
    a dimmer circuit coupled to said generating means and having an output;
    rectifier means coupled to the output of said dimmer circuit;
    means for controlling the value of a load applied to said dimmer circuit; and
    a load coupled to said controlling means, said load being coupled to said dimmer circuit, said dimmer circuit being coupled to said LED device.
  6. 6. The system of claim 5 wherein the value of said load is adjusted during predetermined time periods of said AC waveform.
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Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121956A1 (en) * 2008-04-04 2009-10-08 Lemnis Lighting Patent Holding B.V. Dimmer triggering circuit, dimmer system and dimmable device
US20100141177A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Dimmer-controlled leds using flyback converter with high power factor
US20100141173A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Linearity in led dimmer control
US20100141174A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Current ripple reduction circuit for leds
US20100141178A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Dimmer control leakage pull down using main power device in flyback converter
US20100270935A1 (en) * 2009-04-24 2010-10-28 Toshiba Lighting & Technology Corporation Light-emitting device and illumination apparatus
US20100289426A1 (en) * 2009-05-12 2010-11-18 Toshiba Lighting & Technology Corporation Illumination device
EP2257124A1 (en) * 2009-05-29 2010-12-01 Nxp B.V. Circuit for connecting a low current lighting circuit to a dimmer
US20110043121A1 (en) * 2009-08-21 2011-02-24 Toshiba Lighting & Technology Corporation Lighting circuit and illumination device
US20110057577A1 (en) * 2008-03-24 2011-03-10 Hirokazu Otake Power supply device and lighting equipment provided with power supply device
US20110057576A1 (en) * 2008-03-24 2011-03-10 Hirokazu Otake Power supply device and lighting equipment
US20110057564A1 (en) * 2009-09-04 2011-03-10 Toshiba Lighting & Technology Corporation Led lighting device and illumination apparatus
US7926975B2 (en) 2007-12-21 2011-04-19 Altair Engineering, Inc. Light distribution using a light emitting diode assembly
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
WO2011013060A3 (en) * 2009-07-27 2011-05-12 Koninklijke Philips Electronics N.V. Bleeder circuit
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
EP2326145A1 (en) * 2009-11-13 2011-05-25 Delta Electronics, Inc. LED lamp and LED lamp module
EP2330869A1 (en) * 2009-09-18 2011-06-08 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
DE102010028230A1 (en) * 2010-04-27 2011-10-27 Tridonic Jennersdorf Gmbh Circuit arrangement for operating LEDs
WO2011042510A3 (en) * 2009-10-07 2012-02-02 Lemnis Lighting Patent Holding B.V. Dimmable lighting system
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
CN102404899A (en) * 2010-09-10 2012-04-04 奥斯兰姆有限公司 Method and device for controlling effuser connected to cutting phase dimmer
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
EP2302980A3 (en) * 2009-09-04 2013-01-02 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
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
US8421366B2 (en) 2009-06-23 2013-04-16 Ilumisys, Inc. Illumination device including LEDs and a switching power control system
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
US8513902B2 (en) 2008-09-10 2013-08-20 Toshiba Lighting & Technology Corporation Power supply unit having dimmer function and lighting unit
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
WO2013131252A1 (en) * 2012-03-06 2013-09-12 上海嘉塘电子有限公司 Built-in led operating circuit capable of dimming led lamp
US8540401B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US8541958B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED light with thermoelectric generator
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8596813B2 (en) 2010-07-12 2013-12-03 Ilumisys, Inc. Circuit board mount for LED light tube
US8653750B2 (en) 2010-11-17 2014-02-18 Nxp B.V. Method of controlling an electronic ballast, an electronic ballast and a lighting controller
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8674615B2 (en) 2010-07-28 2014-03-18 Stmicroelectronics Design And Application S.R.O. Control apparatus for LED diodes
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
EP2741587A1 (en) * 2012-12-04 2014-06-11 Hager Controls SAS Device for varying the intensity of the light in luminous charges
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US9057493B2 (en) 2010-03-26 2015-06-16 Ilumisys, Inc. LED light tube with dual sided light distribution
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9124193B2 (en) 2008-10-08 2015-09-01 Holdip Limited Power adaptors
WO2015145287A1 (en) 2014-03-24 2015-10-01 Koninklijke Philips N.V. Radio frequency (rf) controlled lamp with dimmer compatibility
US9163794B2 (en) 2012-07-06 2015-10-20 Ilumisys, Inc. Power supply assembly for LED-based light tube
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
WO2015183592A1 (en) * 2014-05-30 2015-12-03 Technical Consumer Products, Inc. Dimming circuit for a phase -cut triac dimmer
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
US9326344B2 (en) 2012-02-02 2016-04-26 Koninklijke Philips N.V. LED light source with trailing edge phase cut dimming
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
US9736894B2 (en) 2013-12-12 2017-08-15 Verdi Vision Limited Improvements relating to power adaptors

Families Citing this family (82)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7049761B2 (en) 2000-02-11 2006-05-23 Altair Engineering, Inc. Light tube and power supply circuit
US8362838B2 (en) * 2007-01-19 2013-01-29 Cirrus Logic, Inc. Multi-stage amplifier with multiple sets of fixed and variable voltage rails
US8018171B1 (en) 2007-03-12 2011-09-13 Cirrus Logic, Inc. Multi-function duty cycle modifier
US7288902B1 (en) * 2007-03-12 2007-10-30 Cirrus Logic, Inc. Color variations in a dimmable lighting device with stable color temperature light sources
US20080224631A1 (en) * 2007-03-12 2008-09-18 Melanson John L Color variations in a dimmable lighting device with stable color temperature light sources
US7667408B2 (en) * 2007-03-12 2010-02-23 Cirrus Logic, Inc. Lighting system with lighting dimmer output mapping
US8076920B1 (en) 2007-03-12 2011-12-13 Cirrus Logic, Inc. Switching power converter and control system
US7852017B1 (en) 2007-03-12 2010-12-14 Cirrus Logic, Inc. Ballast for light emitting diode light sources
US7696913B2 (en) 2007-05-02 2010-04-13 Cirrus Logic, Inc. Signal processing system using delta-sigma modulation having an internal stabilizer path with direct output-to-integrator connection
US7554473B2 (en) * 2007-05-02 2009-06-30 Cirrus Logic, Inc. Control system using a nonlinear delta-sigma modulator with nonlinear process modeling
US8102127B2 (en) * 2007-06-24 2012-01-24 Cirrus Logic, Inc. Hybrid gas discharge lamp-LED lighting system
US8238127B1 (en) 2007-10-31 2012-08-07 Sadwick Laurence P Method and apparatus for supplying and switching power
US7804697B2 (en) 2007-12-11 2010-09-28 Cirrus Logic, Inc. History-independent noise-immune modulated transformer-coupled gate control signaling method and apparatus
US8222872B1 (en) 2008-09-30 2012-07-17 Cirrus Logic, Inc. Switching power converter with selectable mode auxiliary power supply
US7755525B2 (en) * 2008-01-30 2010-07-13 Cirrus Logic, Inc. Delta sigma modulator with unavailable output values
US8576589B2 (en) 2008-01-30 2013-11-05 Cirrus Logic, Inc. Switch state controller with a sense current generated operating voltage
US8022683B2 (en) 2008-01-30 2011-09-20 Cirrus Logic, Inc. Powering a power supply integrated circuit with sense current
US8008898B2 (en) 2008-01-30 2011-08-30 Cirrus Logic, Inc. Switching regulator with boosted auxiliary winding supply
WO2009100160A1 (en) * 2008-02-06 2009-08-13 C. Crane Company, Inc. Light emitting diode lighting device
US8350499B2 (en) * 2008-02-06 2013-01-08 C. Crane Company, Inc. High efficiency power conditioning circuit for lighting device
US7759881B1 (en) 2008-03-31 2010-07-20 Cirrus Logic, Inc. LED lighting system with a multiple mode current control dimming strategy
US8829812B2 (en) * 2008-04-04 2014-09-09 Koninklijke Philips N.V. Dimmable lighting system
US8344647B2 (en) * 2008-06-23 2013-01-01 Patrick Michael Kinsella Converting dimmer switch AC output duty cycle variation into amplitude variation
US8008902B2 (en) 2008-06-25 2011-08-30 Cirrus Logic, Inc. Hysteretic buck converter having dynamic thresholds
US8847719B2 (en) 2008-07-25 2014-09-30 Cirrus Logic, Inc. Transformer with split primary winding
US8212491B2 (en) 2008-07-25 2012-07-03 Cirrus Logic, Inc. Switching power converter control with triac-based leading edge dimmer compatibility
US8344707B2 (en) 2008-07-25 2013-01-01 Cirrus Logic, Inc. Current sensing in a switching power converter
US8487546B2 (en) 2008-08-29 2013-07-16 Cirrus Logic, Inc. LED lighting system with accurate current control
US8179110B2 (en) * 2008-09-30 2012-05-15 Cirrus Logic Inc. Adjustable constant current source with continuous conduction mode (“CCM”) and discontinuous conduction mode (“DCM”) operation
US8288954B2 (en) 2008-12-07 2012-10-16 Cirrus Logic, Inc. Primary-side based control of secondary-side current for a transformer
US8362707B2 (en) 2008-12-12 2013-01-29 Cirrus Logic, Inc. Light emitting diode based lighting system with time division ambient light feedback response
US8299722B2 (en) 2008-12-12 2012-10-30 Cirrus Logic, Inc. Time division light output sensing and brightness adjustment for different spectra of light emitting diodes
US7994863B2 (en) * 2008-12-31 2011-08-09 Cirrus Logic, Inc. Electronic system having common mode voltage range enhancement
US8482223B2 (en) 2009-04-30 2013-07-09 Cirrus Logic, Inc. Calibration of lamps
US8107825B2 (en) * 2009-05-08 2012-01-31 Samsung Electronics Co., Ltd. Apparatus and method for support of dimming in visible light communication
US8573807B2 (en) * 2009-06-26 2013-11-05 Intel Corporation Light devices having controllable light emitting elements
US8963535B1 (en) 2009-06-30 2015-02-24 Cirrus Logic, Inc. Switch controlled current sensing using a hall effect sensor
US8248145B2 (en) 2009-06-30 2012-08-21 Cirrus Logic, Inc. Cascode configured switching using at least one low breakdown voltage internal, integrated circuit switch to control at least one high breakdown voltage external switch
US8198874B2 (en) 2009-06-30 2012-06-12 Cirrus Logic, Inc. Switching power converter with current sensing transformer auxiliary power supply
US8212493B2 (en) 2009-06-30 2012-07-03 Cirrus Logic, Inc. Low energy transfer mode for auxiliary power supply operation in a cascaded switching power converter
US8922129B1 (en) * 2009-07-06 2014-12-30 Solais Lighting, Inc. Dimmable LED driver and methods with improved supplemental loading
US9155174B2 (en) 2009-09-30 2015-10-06 Cirrus Logic, Inc. Phase control dimming compatible lighting systems
WO2011041423A3 (en) 2009-09-30 2011-06-23 Miral Kotb Self-contained, wearable light controller with wireless communication interface
US8598804B2 (en) * 2009-10-26 2013-12-03 Light-Based Technologies Incorporated Apparatus and method for LED light control
US8686668B2 (en) 2009-10-26 2014-04-01 Koninklijke Philips N.V. Current offset circuits for phase-cut power control
EP2494851A1 (en) 2009-10-26 2012-09-05 Light-Based Technologies Incorporated Holding current circuits for phase-cut power control
US8654483B2 (en) 2009-11-09 2014-02-18 Cirrus Logic, Inc. Power system having voltage-based monitoring for over current protection
JP5214585B2 (en) * 2009-12-25 2013-06-19 シャープ株式会社 Led drive circuit, the phase control dimmer, led lighting lamp, led lighting device, and led lighting system
US8618751B2 (en) * 2009-12-30 2013-12-31 Leviton Manufacturing Co., Inc. Phase control with adaptive parameters
US8698421B2 (en) 2010-04-30 2014-04-15 Infineon Technologies Austria Ag Dimmable LED power supply with power factor control
US8729811B2 (en) 2010-07-30 2014-05-20 Cirrus Logic, Inc. Dimming multiple lighting devices by alternating energy transfer from a magnetic storage element
CN103155387B (en) 2010-07-30 2016-10-19 皇家飞利浦有限公司 Efficient supply of power from the lighting device based on the triac dimmer to
US9307601B2 (en) 2010-08-17 2016-04-05 Koninklijke Philips N.V. Input voltage sensing for a switching power converter and a triac-based dimmer
EP2636135B1 (en) 2010-11-04 2017-01-11 Philips Lighting Holding B.V. Duty factor probing of a triac-based dimmer
US8536799B1 (en) 2010-07-30 2013-09-17 Cirrus Logic, Inc. Dimmer detection
EP2727228A1 (en) 2011-06-30 2014-05-07 Cirrus Logic, Inc. Transformer-isolated led lighting circuit with secondary-side dimming control
US8912781B2 (en) 2010-07-30 2014-12-16 Cirrus Logic, Inc. Integrated circuit switching power supply controller with selectable buck mode operation
US8569972B2 (en) 2010-08-17 2013-10-29 Cirrus Logic, Inc. Dimmer output emulation
EP2609790A2 (en) 2010-08-24 2013-07-03 Cirrus Logic, Inc. Multi-mode dimmer interfacing including attach state control
CN103262399B (en) 2010-11-04 2017-02-15 皇家飞利浦有限公司 A method for controlling the energy consumption of the switching power converter means and
CN103262398B (en) 2010-11-04 2017-06-30 飞利浦照明控股有限公司 Link path lighting system controlled consumption
WO2012061784A3 (en) 2010-11-04 2012-07-05 Cirrus Logic, Inc. Switching power converter input voltage approximate zero crossing determination
US8547034B2 (en) 2010-11-16 2013-10-01 Cirrus Logic, Inc. Trailing edge dimmer compatibility with dimmer high resistance prediction
EP2653014B1 (en) 2010-12-16 2016-10-19 Philips Lighting Holding B.V. Switching parameter based discontinuous mode-critical conduction mode transition
US9313840B2 (en) 2011-06-03 2016-04-12 Cirrus Logic, Inc. Control data determination from primary-side sensing of a secondary-side voltage in a switching power converter
EP2716135A1 (en) 2011-06-03 2014-04-09 Cirrus Logic, Inc. Primary-side control of a switching power converter with feed forward delay compensation
US8593075B1 (en) 2011-06-30 2013-11-26 Cirrus Logic, Inc. Constant current controller with selectable gain
US9544962B2 (en) 2011-08-01 2017-01-10 Philips Lighting Holding B.V. Driver device and driving method for driving an LED unit
US9484832B2 (en) 2011-12-14 2016-11-01 Koninklijke Philips N.V. Isolation of secondary transformer winding current during auxiliary power supply generation
US9370068B2 (en) 2011-12-16 2016-06-14 Leviton Manufacturing Company, Inc. Dimming and control arrangement and method for solid state lamps
US9510425B1 (en) 2012-02-22 2016-11-29 Theodore G. Nelson Driving circuit for light emitting diode apparatus and method of operation
WO2013126836A8 (en) 2012-02-29 2014-08-07 Cirrus Logic, Inc. Mixed load current compensation for led lighting
US9807841B2 (en) 2012-07-12 2017-10-31 Hubbell Incorporated Circuit for expanding the dimming range of an LED lamp
US9184661B2 (en) 2012-08-27 2015-11-10 Cirrus Logic, Inc. Power conversion with controlled capacitance charging including attach state control
US9496844B1 (en) 2013-01-25 2016-11-15 Koninklijke Philips N.V. Variable bandwidth filter for dimmer phase angle measurements
WO2014164755A3 (en) 2013-03-11 2015-04-02 Cirrus Logic, Inc. Quantization error reduction in constant output current control drivers
EP2974540A1 (en) 2013-03-11 2016-01-20 Koninklijke Philips N.V. Reduction of supply current variations using compensation current control
US9282598B2 (en) 2013-03-15 2016-03-08 Koninklijke Philips N.V. System and method for learning dimmer characteristics
US9621062B2 (en) 2014-03-07 2017-04-11 Philips Lighting Holding B.V. Dimmer output emulation with non-zero glue voltage
US9215772B2 (en) 2014-04-17 2015-12-15 Philips International B.V. Systems and methods for minimizing power dissipation in a low-power lamp coupled to a trailing-edge dimmer
US9681526B2 (en) 2014-06-11 2017-06-13 Leviton Manufacturing Co., Inc. Power efficient line synchronized dimmer
US20170273150A1 (en) * 2014-11-29 2017-09-21 Globalfoundries Inc. Dynamic bleed system and method for dynamic loading of a dimmer using event driven architecture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5629607A (en) * 1984-08-15 1997-05-13 Callahan; Michael Initializing controlled transition light dimmers
US5661645A (en) * 1996-06-27 1997-08-26 Hochstein; Peter A. Power supply for light emitting diode array

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5629607A (en) * 1984-08-15 1997-05-13 Callahan; Michael Initializing controlled transition light dimmers
US5661645A (en) * 1996-06-27 1997-08-26 Hochstein; Peter A. Power supply for light emitting diode array

Cited By (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8928025B2 (en) 2007-12-20 2015-01-06 Ilumisys, Inc. LED lighting apparatus with swivel connection
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US7926975B2 (en) 2007-12-21 2011-04-19 Altair Engineering, Inc. Light distribution using a light emitting diode assembly
US20110057577A1 (en) * 2008-03-24 2011-03-10 Hirokazu Otake Power supply device and lighting equipment provided with power supply device
US8884540B2 (en) 2008-03-24 2014-11-11 Toshiba Lighting & Technology Corporation Power supply device and lighting equipment provided with power supply device
US8354804B2 (en) 2008-03-24 2013-01-15 Toshiba Lighting & Technology Corporation Power supply device and lighting equipment
US8441204B2 (en) 2008-03-24 2013-05-14 Toshiba Lighting & Technology Corp. Power supply device and lighting equipment provided with power supply device
US9226357B2 (en) 2008-03-24 2015-12-29 Toshiba Lighting & Technology Corporation Power supply device and lighting equipment provided with power supply device
US20110057576A1 (en) * 2008-03-24 2011-03-10 Hirokazu Otake Power supply device and lighting equipment
US8896225B2 (en) 2008-03-24 2014-11-25 Toshiba Lighting Technology Corporation Power supply device and lighting equipment provided with power supply device
WO2009121956A1 (en) * 2008-04-04 2009-10-08 Lemnis Lighting Patent Holding B.V. Dimmer triggering circuit, dimmer system and dimmable device
US8807785B2 (en) 2008-05-23 2014-08-19 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
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
US8513902B2 (en) 2008-09-10 2013-08-20 Toshiba Lighting & Technology Corporation Power supply unit having dimmer function and lighting unit
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US9888533B2 (en) 2008-10-08 2018-02-06 Holdip Limited Power adaptors
US9124193B2 (en) 2008-10-08 2015-09-01 Holdip Limited Power adaptors
US10036549B2 (en) 2008-10-24 2018-07-31 Ilumisys, Inc. Lighting including integral communication apparatus
US9635727B2 (en) 2008-10-24 2017-04-25 Ilumisys, Inc. Light and light sensor
US9353939B2 (en) 2008-10-24 2016-05-31 iLumisys, Inc Lighting including integral communication apparatus
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
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US9398661B2 (en) 2008-10-24 2016-07-19 Ilumisys, Inc. Light and light sensor
US9585216B2 (en) 2008-10-24 2017-02-28 Ilumisys, Inc. Integration of LED lighting with building controls
US8251544B2 (en) 2008-10-24 2012-08-28 Ilumisys, Inc. Lighting including integral communication apparatus
US9101026B2 (en) 2008-10-24 2015-08-04 Ilumisys, Inc. Integration of LED lighting with building controls
US8946996B2 (en) 2008-10-24 2015-02-03 Ilumisys, Inc. Light and light sensor
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
US8089216B2 (en) 2008-12-10 2012-01-03 Linear Technology Corporation Linearity in LED dimmer control
WO2010068568A1 (en) * 2008-12-10 2010-06-17 Linear Technology Corporation Dimmer control leakage pull down using main power device in flyback converter
US8692481B2 (en) 2008-12-10 2014-04-08 Linear Technology Corporation Dimmer-controlled LEDs using flyback converter with high power factor
US20100141178A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Dimmer control leakage pull down using main power device in flyback converter
US20100141174A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Current ripple reduction circuit for leds
US20100141173A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Linearity in led dimmer control
US20100141177A1 (en) * 2008-12-10 2010-06-10 Linear Technology Corporation Dimmer-controlled leds using flyback converter with high power factor
US8310172B2 (en) 2008-12-10 2012-11-13 Linear Technology Corporation Current ripple reduction circuit for LEDs
US8013544B2 (en) 2008-12-10 2011-09-06 Linear Technology Corporation Dimmer control leakage pull down using main power device in flyback converter
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
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
US8643288B2 (en) 2009-04-24 2014-02-04 Toshiba Lighting & Technology Corporation Light-emitting device and illumination apparatus
US20100270935A1 (en) * 2009-04-24 2010-10-28 Toshiba Lighting & Technology Corporation Light-emitting device and illumination apparatus
US20100289426A1 (en) * 2009-05-12 2010-11-18 Toshiba Lighting & Technology Corporation Illumination device
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
WO2010137002A1 (en) * 2009-05-29 2010-12-02 Nxp B.V. Circuit for connecting a low current lighting circuit to a dimmer
US8664885B2 (en) 2009-05-29 2014-03-04 Nxp B.V. Circuit for connecting a low current lighting circuit to a dimmer
EP2257124A1 (en) * 2009-05-29 2010-12-01 Nxp B.V. Circuit for connecting a low current lighting circuit to a dimmer
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
US8421366B2 (en) 2009-06-23 2013-04-16 Ilumisys, Inc. Illumination device including LEDs and a switching power control system
WO2011013060A3 (en) * 2009-07-27 2011-05-12 Koninklijke Philips Electronics N.V. Bleeder circuit
JP2015057867A (en) * 2009-07-27 2015-03-26 コーニンクレッカ フィリップス エヌ ヴェ Bleeder circuit
US8723431B2 (en) 2009-07-27 2014-05-13 Koninklijke Philips N.V. Bleeder circuit
US8970127B2 (en) 2009-08-21 2015-03-03 Toshiba Lighting & Technology Corporation Lighting circuit and illumination device
US20110043121A1 (en) * 2009-08-21 2011-02-24 Toshiba Lighting & Technology Corporation Lighting circuit and illumination device
US8427070B2 (en) * 2009-08-21 2013-04-23 Toshiba Lighting & Technology Corporation Lighting circuit and illumination device
US20110057564A1 (en) * 2009-09-04 2011-03-10 Toshiba Lighting & Technology Corporation Led lighting device and illumination apparatus
US8610363B2 (en) 2009-09-04 2013-12-17 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
EP2302980A3 (en) * 2009-09-04 2013-01-02 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
US8492992B2 (en) 2009-09-18 2013-07-23 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
EP2330869A1 (en) * 2009-09-18 2011-06-08 Toshiba Lighting & Technology Corporation LED lighting device and illumination apparatus
WO2011042510A3 (en) * 2009-10-07 2012-02-02 Lemnis Lighting Patent Holding B.V. Dimmable lighting system
EP2326145A1 (en) * 2009-11-13 2011-05-25 Delta Electronics, Inc. LED lamp and LED lamp module
US9395075B2 (en) 2010-03-26 2016-07-19 Ilumisys, Inc. LED bulb for incandescent bulb replacement with internal heat dissipating structures
US8541958B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED light with thermoelectric generator
US9013119B2 (en) 2010-03-26 2015-04-21 Ilumisys, Inc. LED light with thermoelectric generator
US8540401B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US8840282B2 (en) 2010-03-26 2014-09-23 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US9057493B2 (en) 2010-03-26 2015-06-16 Ilumisys, Inc. LED light tube with dual sided light distribution
DE102010028230A1 (en) * 2010-04-27 2011-10-27 Tridonic Jennersdorf Gmbh Circuit arrangement for operating LEDs
WO2011134980A3 (en) * 2010-04-27 2012-01-05 Tridonic Jennersdorf Gmbh Circuit arrangement for operating leds
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
US8596813B2 (en) 2010-07-12 2013-12-03 Ilumisys, Inc. Circuit board mount for LED light tube
US8674615B2 (en) 2010-07-28 2014-03-18 Stmicroelectronics Design And Application S.R.O. Control apparatus for LED diodes
WO2012031901A3 (en) * 2010-09-10 2012-08-30 Osram Ag Method and apparatus for controlling bleeder connected to phase-cut dimmer
CN102404899A (en) * 2010-09-10 2012-04-04 奥斯兰姆有限公司 Method and device for controlling effuser connected to cutting phase dimmer
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8894430B2 (en) 2010-10-29 2014-11-25 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8653750B2 (en) 2010-11-17 2014-02-18 Nxp B.V. Method of controlling an electronic ballast, an electronic ballast and a lighting controller
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9326344B2 (en) 2012-02-02 2016-04-26 Koninklijke Philips N.V. LED light source with trailing edge phase cut dimming
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
WO2013131252A1 (en) * 2012-03-06 2013-09-12 上海嘉塘电子有限公司 Built-in led operating circuit capable of dimming led lamp
US9163794B2 (en) 2012-07-06 2015-10-20 Ilumisys, Inc. Power supply assembly for LED-based light tube
US9807842B2 (en) 2012-07-09 2017-10-31 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
EP2741587A1 (en) * 2012-12-04 2014-06-11 Hager Controls SAS Device for varying the intensity of the light in luminous charges
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US9736894B2 (en) 2013-12-12 2017-08-15 Verdi Vision Limited Improvements relating to power adaptors
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
WO2015145287A1 (en) 2014-03-24 2015-10-01 Koninklijke Philips N.V. Radio frequency (rf) controlled lamp with dimmer compatibility
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
US9271353B2 (en) 2014-05-30 2016-02-23 Technical Consumer Products, Inc. Dimming circuit for a phase-cut TRIAC dimmer
WO2015183592A1 (en) * 2014-05-30 2015-12-03 Technical Consumer Products, Inc. Dimming circuit for a phase -cut triac dimmer

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