AT519021A5 - POWER CONTROL OF LED, BY MEANS OF THE AVERAGE VALUE OF THE LED CURRENT AND BIDIRECTIONAL COUNTER - Google Patents

Abstract

A method for power control of an LED by means of a converter with a switch (Sl), wherein the LED is connected in the output circuit and an inductance (Ll) is magnetized when the switch 10 (Sl) is actively clocked, being used as a feedback variable for the control for the mean value of the LED current (ILEn) representative measured actual value is used, which is compared with a reference value (IAvG_soLL). 15 wherein, depending on a difference between the actual value and the reference value (IAvG soLL), the duty ratio of the current switch-on operation of the actively-timed switch (S1) and / or a subsequent switch-on operation is set, characterized in that as a control variable of the power control in addition to the Clocking the active clocked switch (Sl) the level of a DC bus voltage supplying the converter is used, and the DC bus voltage is generated by means of an active PFC circuit 25, wherein the level of the generated bus voltage by changing the timing of a switch (S6) the PFC circuit is executed.

Description

PCT application number: PCT / EP10054014 (22) Filing date: March 26, 2010 (88) Search report published on: March 15, 2018 (30) Priority:

04/14/2009 AT GM 229/09 claimed. 04/15/2009 DE 102009017139 claims. 19.03.2010 DE 102010003054 claimed.

(71) Patent applicants:

Tridonic GmbH & Co KG 6851 Dornbirn (AT) (56)

CITATION:

US 2008067953 A1

ST MICROELECTRONICS: Modified buck converter for

LED applications, Application note AN2928 [online], 1.

March 2009 (March 1, 2009) [determined on October 24, 2016 (October 24, 2016)]. Determined on the Internet:

<URL: http: //datasheet.datasheetarchive.com/originals/librar y / Datasheet-071 / DSA00359864.pdf>, XP002693999 WO 2006102355 A2

DE 102006026938 A1

US 2007097044 A1

US 2007229001 A1

EP 0287360 A2

EP 1372359 A1

DE 102006034371 A1

US 7274183 B1

WO 2008112820 A2 (74) representative:

BARTH ALEXANDER DIPL.ING. (FH) 6851 DORNBIRN (AT)

AT 519021 A5 2018-03-15 (54) POWER CONTROL OF LED, AVERAGE VALUE OF THE LED CURRENT AND BIDIRECTIONAL COUNTER (57) Method for power control of an LED using a converter with a switch (S1), the LED being connected in the output circuit and an inductor (L1) is magnetized when the switch (S1) is actively clocked, a measured actual value representative of the mean value of the LED current (ILED) being used as the feedback variable for the control, which is compared with a reference value (IAVG_SOLL) is set, depending on a difference between the actual value and the reference value (IAVG_SOLL) the duty cycle of the current switch-on process of the actively clocked switch (S1) and / or a subsequent switch-on process, characterized in that the control variable of the power control in addition to the clocking of the actively clocked switch (S1) the level of a DC bus voltage supplying the converter is used w ird, and the DC bus voltage is generated by means of an active PFC circuit, the level of the generated bus voltage being carried out by changing the timing of a switch (S6) of the PFC circuit.

DVR 0078018

Search report for A 9090/2010

Classification of the subject of the application according to IPC:

H05B 33/08 (2006.01)

Classification of the application according to CPC:

H05B 33/0815 (2013.01); H05B 33/0848 (2013.01)

Researched test substance (classification):

H05B

Consulted online database:

WPI, EPODOC

This search report was published on 22.09.2011

Claims (2)

Claims 1-35 created. Category ^*) Title of the publication: Country code, publication number, document type (applicant), publication date, text or figure if necessary Concerning claim X X X X A A A US 2008067953 A1 (KRANZ, C.) March 20, 2008 (March 20, 2008) Summary, Figures 1, 4-6, 9; Paragraphs [0027], [0051] [0066], [0079]. ST MICROELECTRONICS: Modified buck converter for LED applications, Application note AN2928 [online], March 1, 2009 (March 1, 2009) [determined on October 24, 2016 (October 24, 2016)]. Determined on the Internet: <URL: http: //datasheet.datasheetarchive.com/originals/library/ Datasheet-071 / DSA00359864.pdf>, XP002693999 Chapters 1, 2. WO 2006102355 A2 (FAIRCHILD SEMICONDUCTOR) September 28, 2006 (September 28, 2006) Summary, Figures 1, 2, 4, 6; Paragraphs [0026] - [0057]. DE 102006026938 A1 (PATENT TRUST COMPANY FOR ELECTRIC LIGHT BULBS MBH) December 13, 2007 (December 13, 2007) Summary, Fig. 7; Paragraphs [0015] - [0019], [0063] [0071]. US 2007097044 A1 (YANG, T.Y.) May 3, 2007 (May 3, 2007) Summary, Figs. 3-5, 7; Paragraphs [0005], [0018] - [0020]. US 2007229001 A1 (MCINTOSH, J.A. et al.) October 4, 2007 (October 4, 2007) Summary, Fig. 3; Paragraphs [0026] - [0031]. EP 0287360 A2 (SHARP KK) October 19, 1988 (October 19, 1988) summary, Figs. 1, 5; Page 2, lines 43-53; Page 4, lines 26-33. 1, 3-5, 7, 9-21, 24, 26-35 1-4, 7, 920, 24, 26-35 1, 3-7, 922, 24, 26-35 1, 3-5, 7, 9-21, 24, 26-35 1-35 1-35 1-35 Date of completion of the research: ".. _{1 2} examiners: 24.10.2016 ^{Page 1 VOn 2} LOIBNER Klaus ^*) Categories of the documents listed: A Publication that defines the general state of the art. X Publication of particular importance: the application P document which is of importance (categories X or Y), but according to the subject cannot be published as new or on the priority date of the application solely due to this publication. inventive activity can be considered based. E Document of particular importance (Category X) from which Y Publication of importance: the subject of the application cannot be an “older right” (earlier filing date, however, should be considered as based on inventive step, if the republished, protection is possible in Austria, novelty would be considered) Make publication with one or more other publications). is associated with this category and this connection for & publication which is a member of the same patent family. is obvious to a specialist. / 2nd DVR 0078018 Continuation of the search report for A 9090/2010 Page 2 of 2 Category ^*) Title of the publication: Country code, publication number, document type (applicant), publication date, text or figure if necessary Concerning claim A A EP 1372359 A1 (PATENT TRUST COMPANY FOR ELECTRICAL GLUEHLAMPEN MBH) December 17, 2003 (December 17, 2003) Summary Figures 1, 3; Paragraphs [0002] - [0020], [0023] [0025]. DE 102006034371 A1 (TRIDONICATCO SCHWEIZ AG) October 25, 2007 (October 25, 2007) Summary, Figures 1, 5; Paragraphs [0035] - [0047], [0050]. 1-35 1-35