WO2010041265A2 - Pilote de led et système d’éclairage utilisant ledit pilote - Google Patents

Pilote de led et système d’éclairage utilisant ledit pilote Download PDF

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Publication number
WO2010041265A2
WO2010041265A2 PCT/IN2009/000363 IN2009000363W WO2010041265A2 WO 2010041265 A2 WO2010041265 A2 WO 2010041265A2 IN 2009000363 W IN2009000363 W IN 2009000363W WO 2010041265 A2 WO2010041265 A2 WO 2010041265A2
Authority
WO
WIPO (PCT)
Prior art keywords
current signal
led
current
integrated circuit
peaks
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.)
Ceased
Application number
PCT/IN2009/000363
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English (en)
Other versions
WO2010041265A3 (fr
Inventor
Kiran Madhukant Mehta
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.)
LEDTRICS LIGHTING PRIVATE Ltd
Original Assignee
LEDTRICS LIGHTING PRIVATE Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LEDTRICS LIGHTING PRIVATE Ltd filed Critical LEDTRICS LIGHTING PRIVATE Ltd
Publication of WO2010041265A2 publication Critical patent/WO2010041265A2/fr
Publication of WO2010041265A3 publication Critical patent/WO2010041265A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology

Definitions

  • the present invention relates to an LED driver and to lighting systems comprising the LED driver.
  • LED Light emitting diode
  • LED converts electrical energy in to light energy and emits light.
  • LED has applications in outdoor lighting, pilot lights (in circuits), backlights, tube lights, torches, toys, indicators, sensors and control apparatus, lanterns, tunnel and mine lights, decorative and landscaping lights, pathways and runway lights, light house lights etc.
  • a LED driver is used to supply desired current and voltage to LED or an array of multiple LEDs.
  • the LED driver is used to achieve optimum performance of the LED.
  • the patent application WO2007021935 discloses an LED driver which includes a switch current regulator connected to a current control signal input.
  • the switch current regulator controls a current provided to an LED based upon the magnitude of a voltage on the current control signal input.
  • the current supply is regulated by regulating the amount of voltage. Therefore, the current supplied to LED is constant and consumes more energy and gives varying shades of output light.
  • Patent application US20060170373 discloses an LED driver, including a current adjusting unit to adjust magnitude of a current flowing on the LED by supplying power from a power supply device to the LED and cutting off the power.
  • Patent application US20050088209 relates to a switching device for driving an LED array.
  • the switching device drives the LED array by means of pulse shaped current.
  • the value of the pulse shaped current is regulated by at least one of frequency modulation, pulse width modulation and amplitude modulation.
  • the regulation of current is achieved through voltage regulation.
  • the LED drivers known in the art use techniques of pulse width modulated (PWM) voltage control to provide a constant current to drive LEDs. These drivers provide the constant current for driving the LEDs in an inefficient mariner and thus consume large amount of power and have higher heat dissipation. The lumen output of the LED is low. Therefore, the known LED drivers increase the size and cost of the LED lighting system.
  • PWM pulse width modulated
  • the present invention in an embodiment, is directed towards an apparatus for driving at least one light-emitting diode (LED).
  • the apparatus for driving the at least one LED comprises a current switching unit enabled to switch an input current signal through current pulse width modulation, control peaks of the switched current signal and adjust duty cycle of the switched current signal to provide an intermediate current signal and amplify the intermediate current signal as per requirements of the at least one LED to provide an output current signal.
  • the present invention is directed towards a lighting system comprising at least one light emitting diode (LED) and the apparatus for driving the at least one LED.
  • LED light emitting diode
  • the present invention is directed towards a method for driving at least one light-emitting diode (LED).
  • the method comprises receiving an input current signal, switching the input current signal through current pulse width modulation to obtain a switched current signal, controlling peaks of the switched current signal to obtain a switched current signal with controlled current peaks as per requirements of the at least one LED, adjusting duty cycle of the switched current signal with controlled current peaks signal to obtain an intermediate current signal as per requirements of the at least one LED and the controlled peaks of the switched current signal, amplifying the intermediate current signal to obtain an output current signal; and, providing the output current signal to the at least one LED.
  • FIG. 1 illustrates a schematic diagram of an LED driver for driving at least one LED, in accordance with an embodiment of the present invention.
  • FIG. 2 illustrates a schematic diagram for a lighting system, in accordance with an embodiment of the present invention.
  • FIG. 3 illustrates a schematic diagram for a method of driving at least one LED, in accordance with an embodiment of the present invention.
  • the present invention relates to a Light Emitting Diode (LED) driver apparatus and a lighting system comprising the LED driver.
  • the LED driver is be used to drive a single LED or an array of multiple LEDs in a range of milliWatts to 100 Watts or more.
  • FIG. 1 depicts an LED driver (100) for driving at least one LED, in accordance with one embodiment of the present invention.
  • the LED driver comprises a current switching unit (1 10) enabled to switch an input current signal through current pulse width modulation, control peaks of the switched current signal and adjust a duty cycle of the switched current signal to provide an intermediate current signal and amplify the intermediate current signal as per the requirements of the LED to provide an output current signal.
  • the current switching unit 1 10 includes a first integrated circuit 1 12, and a second integrated circuit 1 14.
  • the second integrated circuit 1 14 receives an input current signal through the first integrated circuit 1 12.
  • the first integrated circuit 1 12 triggers the second integrated circuit after receiving an external signal in the form of a relay or a switch.
  • the first integrated circuit 1 12 receives an output voltage supply from the voltage converter unit 130 or directly from a power source.
  • the current switching unit includes a first inductor 1 16, in communication with the second integrated circuit 1 14.
  • the first inductor 1 16 provides oscillations for current pulse width modulation of the input current signal.
  • the first inductor 1 16 is a coil or a solenoid.
  • the current switching unit includes a first variable resistor 1 18 in communication with the second integrated circuit 1 14.
  • the pulse width modulated switched current signal is regulated through the first variable resistor 1 18.
  • the first variable resistor 1 18 controls peaks of the pulse width modulated switched current signal depending on requirements of the at least one LED.
  • the first variable resistor 1 18 is configured accordingly.
  • the current peaks are adjusted to 2 - 10 times of the rated current required by the at least one LED, using the first variable resistor 1 18.
  • the first variable resistor 1 18 is controlled externally and in one embodiment the value of the first variable resistor 1 18 is programmed.
  • the first variable resistor 1 18 is a potentiometer, rheostat or a preset.
  • the current switching unit 1 10 includes a second variable resistor 120 in communication with the second integrated circuit 1 14.
  • the second variable resistor 120 regulates a duty cycle of the pulse width modulated switched current signal with controlled current peaks to provide an intermediate current signal.
  • the regulation of duty cycle is based on requirements of the at least one LED and configuration of the first variable resistor 1 18.
  • the second variable resistor 120 is configured accordingly.
  • the second variable resistor 120 is controlled externally and in one embodiment the value of the second variable resistor 120 is programmed.
  • the second variable resistor is a potentiometer, rheostat or a preset.
  • the current switching unit also includes a transistor 122, in communication with the second integrated circuit 1 14.
  • the transistor 122 receives the intermediate current signal from the second integrated circuit 1 14 and amplifies the intermediate current signal to give an output current signal.
  • This output current signal is an amplified pulse width modulated switched current signal with controlled current peaks and adjusted duty cycle.
  • the output signal is provided to the at least one LED.
  • the at least one LED provides high lumen output and reduces power consumption because of high current peaks and adjusted duty cycle respectively. Further, lower power consumption leads to negligible heat dissipation.
  • a feedback resistor 124 senses the output current signal provided to the at least one LED and provides the measured signal information to the second integrated circuit 1 14. The output of the secrnd integrated circuit 1 14 is thus regulated.
  • the LED driver apparatus 100 optionally includes a voltage converter unit 130.
  • the voltage converter unit 130 is enabled to provide an output voltage supply based on the requirements of the current switching unit.
  • the voltage converter unit 130 further includes a third integrated circuit 132, a second inductor 134, a second feedback resistor 136, and a third variable resistor 138.
  • the third integrated circuit 132 receives an input voltage supply from a power supply and provides an output current signal.
  • the second inductor 134 provides oscillations for pulse width modulation of the input current signal.
  • the second inductor 134 is a coil or a solenoid.
  • the third variable resistor 138 regulates upper limit of the output current signal based on requirements of the current switching unit 1 10. Thus, the third variable resistor 138 is configured accordingly.
  • the second feedback resistor 136 measures the output voltage supply and provides the measured information to the third integrated circuit 132.
  • the output voltage supply from the third integrated circuit 132 is regulated.
  • the voltage converter unit 130 optionally comprises a transformer to boost the voltage of the output voltage supply.
  • the voltage converter unit 130 is an optional component.
  • the voltage converter unit is alternately called SMPS.
  • the present invention is directed towards a lighting system comprising an LED or an array of multiple LEDs and an LED driver.
  • the system optionally comprises at least one power source.
  • the system also optionally comprises a heat dissipation apparatus.
  • FIG. 2 depicts a lighting system 200 in accordance with an embodiment of the present invention.
  • the lighting system 200 comprises an LED driver 220 and an LED or an array of multiple LEDs 230.
  • the lighting system also further comprises at least one power supply 210.
  • the power supply 210 supplies AC or DC power.
  • Power supply is an electrical power supply, a solar power supply or a battery supply. Further, the power supply is 24 - 48 volts DC supply, or 220 - 240 volts AC supply. The AC supply is converted to DC before feeding to the voltage converter unit 222.
  • the LED driver 220 further comprises the voltage converter unit 222 and a current switching unit 224.
  • the voltage converter unit 222 is an optional component.
  • the voltage converter unit 222 changes the voltage level of supplied power.
  • the voltage converter unit 222 either boosts or drops the voltage level depending on type of power supply used and requirements of the current switching unit 224.
  • the power supply such as a lithium-ion battery, having a normal operating voltage of about 3.6 volts either cannot power the circuit because of low supply voltage or gives deteriorated performance when the battery runs down. In such cases the voltage converter unit is used to step-up the voltage to a desired voltage level.
  • the current switching unit 224 receives an output voltage supply from the voltage converter unit 5 222 or directly from the power supply 210 The current switching unit 224 provides an output current signal to drive the LED or the array of multiple LEDs 230.
  • the output current signal is a pulse width modulated switched current signal with controlled current peaks and adjusted duty cycle. The LED or array of multiple LEDs is driven on this output current signal and hence provides high lumen output with lower power consumption and minimal heat dissipation. 10
  • FIG. 3 depicts a method for driving at least one LED or an array of multiple LEDs in accordance with an embodiment of the present invention.
  • the method comprises receiving an input current signal 310 and switching the input current signal through current pulse width modulation to obtain a . switched current signal 320. Oscillations for current pulse width modulation are provided by a first 15 inductor.
  • the method further comprises controlling the peaks of the switched current signal to obtain a switched current signal with controlled current peaks 330.
  • the peaks of the switched current signal are controlled as per requirements of an LED or an array of multiple LEDs through a first variable resistor.
  • the method further comprises adjusting duty cycle of the switched current 1 signal with controlled current peaks to obtain an intermediate current signal 340.
  • the intermediate -0 current signal is a pulse width modulated switched current signal with controlled current peaks and adjusted duty cycle.
  • the duty cycle adjustment is carried out through a second variable resistor based on the requirements of the LED or array of multiple LEDs and configuration of the first variable resistor.
  • the method further comprises amplifying the intermediate current signal to obtain an output current signal 350.
  • the output current signal is a pulse width modulated switched current 25 signal with controlled current peaks and adjusted duty cycle.
  • the amplification is cairicd out through a transistor.
  • the method further comprises providing the output current signal to the LED or the array of multiple LEDs 360.
  • the output current signal which is provided to the LED or the array of multiple LEDs is adjusted to SO 2 - 10 times the rated current required by the LED or the array of multiple LEDs.
  • the LED driver apparatus of the present invention drives LEDs to provide high lumen output with lower power consumption and minimal heat dissipation.
  • the LED driver apparatus was operated at 45% duty cycle and current peaks of 500% and provided an output current signal, which provided maximum driving power to the LED.
  • the LED provided 100% lumen output without dimming and the average power consumption was lowered by 35% - 40%.
  • Table 1 represents the comparison of the LED driver apparatus present invention over conventional LED drivers.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L’invention concerne un appareil servant à piloter au moins une diode électroluminescente (LED), comprenant une unité de commutation de courant à même de commuter un signal de courant d’entrée par modulation d’impulsion du courant en durée, de réguler les crêtes du signal de courant commuté et ajuster le facteur d’utilisation du signal de courant commuté pour produire un signal de courant intermédiaire, et d’amplifier le signal de courant intermédiaire en fonction des besoins de la ou des LED pour produire un signal de courant de sortie.
PCT/IN2009/000363 2008-06-26 2009-06-25 Pilote de led et système d’éclairage utilisant ledit pilote Ceased WO2010041265A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1339/MUM/2008 2008-06-26
IN1339MU2008 2008-06-26

Publications (2)

Publication Number Publication Date
WO2010041265A2 true WO2010041265A2 (fr) 2010-04-15
WO2010041265A3 WO2010041265A3 (fr) 2010-08-12

Family

ID=42101035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2009/000363 Ceased WO2010041265A2 (fr) 2008-06-26 2009-06-25 Pilote de led et système d’éclairage utilisant ledit pilote

Country Status (1)

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5850126A (en) * 1997-04-11 1998-12-15 Kanbar; Maurice S. Screw-in led lamp
DE19933733B4 (de) * 1999-07-19 2010-10-21 Volkswagen Ag PWM-Ansteuerverfahren
IL134337A0 (en) * 2000-02-02 2001-04-30 Krainer Pini A method for reducing energy consumption of led illuminated road marker and a high efficiency road marker using same
DE10028141C1 (de) * 2000-06-07 2002-03-14 Siemens Ag Verfahren und Einrichtung zur Ansteuerung von Leuchteinheiten in einem optischen Überwachungssystem
GB2369730B (en) * 2001-08-30 2002-11-13 Integrated Syst Tech Ltd Illumination control system
JP4163079B2 (ja) * 2003-09-12 2008-10-08 ローム株式会社 発光制御回路
US6987787B1 (en) * 2004-06-28 2006-01-17 Rockwell Collins LED brightness control system for a wide-range of luminance control
DE102006029438B4 (de) * 2006-06-20 2018-05-17 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Verfahren und Vorrichtung zur Ansteuerung von Leuchtdioden einer Beleuchtungsvorrichtung

Also Published As

Publication number Publication date
WO2010041265A3 (fr) 2010-08-12

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