GB2461895A - Light emitting diode driver - Google Patents

Light emitting diode driver Download PDF

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Publication number
GB2461895A
GB2461895A GB0813010A GB0813010A GB2461895A GB 2461895 A GB2461895 A GB 2461895A GB 0813010 A GB0813010 A GB 0813010A GB 0813010 A GB0813010 A GB 0813010A GB 2461895 A GB2461895 A GB 2461895A
Authority
GB
United Kingdom
Prior art keywords
light emitting
emitting diode
diode driver
emitting diodes
rectification
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.)
Withdrawn
Application number
GB0813010A
Other versions
GB0813010D0 (en
Inventor
Elliot Makin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0813010A priority Critical patent/GB2461895A/en
Publication of GB0813010D0 publication Critical patent/GB0813010D0/en
Publication of GB2461895A publication Critical patent/GB2461895A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H05B33/0803—
    • 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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A high power light emitting diode (LED) driver includes inductive choke 1 for limiting available current and rectification 2, 3, 4, 5 so that the light emitting diode array 9 is supplied with a current limited direct current supply. The rectification may be provided by the light emitting diodes. The inductive choke may be made from a parallel combination of one or more series combinations of inductors.

Description

Light Emitting Diode Driver This invention relates to a method of controlling the current through an array of high power light emitting diodes that are powered from an alternating current mains voltage source.
The normal method for controlling the current in an array of high power light emitting diodes is to use an electronic switch mode power supply.
while there are many advantages of using an electronic power supply to control the current in high power light emitting diodes there are two main disadvantages. The first disadvantage is cost. Electronic power supplies are made up from a large number of components so invariably have a significant cost element. The second disadvantage is reliability. Light emitting diodes can have an operating life of over 50,000 hours whereas some switch mode power supplies have a mean time to failure of less than 5,000 hours. The poor reliability of switch mode power supplies come from three main sources: Firstly the use of electrolytic capacitors which have a short operational life; Secondly the thermal or electrical failure of components involved in the switching stages; Thirdly the increased probability of a connection failure due to the increased number of components in the whole system.
An example of the invention will now be described by referring to the following drawings: Figure 1 shows a light emitting diode driver comprising an inductive choke and a diode bridge rectifier.
Figure 2 how a light emitting diode driver where the light emitting diodes themselves provide rectification.
In Figure 1, a light emitting diode driver includes an inductive choke 1 which is connected to a diode bridge rectifier 2,3,4,5. On the input there is an optional power factor correction capacitor 6 and a voltage dependent resistor 7. On the output there is an optional smoothing capacitor 8. The load 9 is a parallel combination of one or more series combinations of one or more light emitting diodes.
In Figure 2, a light emitting diode driver arrangement includes an inductive choke 1 which is connected to a parallel combination of one or more anti-parallel series combinations or one or more light emitting diodes 10. On the input there is an optional power factor correction capacitor 6 and voltage dependant resistor 7.
The low component count, exclusion of high frequency switching circuitry and the removal of electrolytic capacitors provides a solution which is both cost effective and capable of having an operational life greater than the light emitting diodes that it is controlling.
In the lighting industry inductive chokes have been used extensively to control the current in many light sources including high intensity discharge and fluorescent lamps. The novel aspect of this design is the inclusion of a bridge rectifier to allow operation of a direct current light source.

Claims (3)

  1. Claims 1. A high power light emitting diode driver using en inductive choke and rectification to control the current in an array of light emitting diodes.
  2. 2. A high power light emitting diode driver using an inductive choke according to claim 1, in which the rectification is provided by the light emitting diodes themselves.
  3. 3. A high power light emitting diode driver according to claim 1 where the inductive choke is made from a parallel combination of one or more series combinations of inductors.
GB0813010A 2008-07-16 2008-07-16 Light emitting diode driver Withdrawn GB2461895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0813010A GB2461895A (en) 2008-07-16 2008-07-16 Light emitting diode driver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0813010A GB2461895A (en) 2008-07-16 2008-07-16 Light emitting diode driver

Publications (2)

Publication Number Publication Date
GB0813010D0 GB0813010D0 (en) 2008-08-20
GB2461895A true GB2461895A (en) 2010-01-20

Family

ID=39722375

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0813010A Withdrawn GB2461895A (en) 2008-07-16 2008-07-16 Light emitting diode driver

Country Status (1)

Country Link
GB (1) GB2461895A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479519A (en) * 2010-02-05 2011-10-19 Ecotek Uk Ltd Apparatus for coupling to a mains electrical supply for reducing the reactive, apparent and also the real power components
GB2549293A (en) * 2016-04-11 2017-10-18 Frederick Fellerman Bernard LED lamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060261747A1 (en) * 2005-05-20 2006-11-23 Takeshi Mashiko Light emitting diode drive circuit
US20070170874A1 (en) * 2006-01-20 2007-07-26 Matsushita Electric Industrial Co., Ltd. Light emitting diode drive apparatus
US20070267978A1 (en) * 2006-05-22 2007-11-22 Exclara Inc. Digitally controlled current regulator for high power solid state lighting
EP1881743A2 (en) * 2006-07-10 2008-01-23 Toshiba Lighting & Technology Corporation Lighting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060261747A1 (en) * 2005-05-20 2006-11-23 Takeshi Mashiko Light emitting diode drive circuit
US20070170874A1 (en) * 2006-01-20 2007-07-26 Matsushita Electric Industrial Co., Ltd. Light emitting diode drive apparatus
US20070267978A1 (en) * 2006-05-22 2007-11-22 Exclara Inc. Digitally controlled current regulator for high power solid state lighting
EP1881743A2 (en) * 2006-07-10 2008-01-23 Toshiba Lighting & Technology Corporation Lighting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479519A (en) * 2010-02-05 2011-10-19 Ecotek Uk Ltd Apparatus for coupling to a mains electrical supply for reducing the reactive, apparent and also the real power components
GB2549293A (en) * 2016-04-11 2017-10-18 Frederick Fellerman Bernard LED lamp

Also Published As

Publication number Publication date
GB0813010D0 (en) 2008-08-20

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)