Global Patent Index - EP 0948241 A3

EP 0948241 A3 2000-12-27 - Method and apparatus for supplying power to light emitting diodes

Title (en)

Method and apparatus for supplying power to light emitting diodes

Title (de)

Verfahren und Vorrichtung zum Betreiben von Leuchtdioden

Title (fr)

Procédé et appareil pour alimenter des diodes électroluminescentes

Publication

EP 0948241 A3 (EN)

Application

EP 99660053 A

Priority

FI 980717 A

Abstract (en)

[origin: EP0948241A2] The invention relates to a method and an apparatus for supplying power to light emitting diodes connected to a light emitting diode matrix (MN) comprising one or more parallel connected light emitting diodes or a series connection thereof. The method comprises repeated phases where the amount of current in the main circuit formed of a series connection of the light emitting diode matrix (MN), a switching element (K1) and an inductance (N1) is monitored, the main circuit is opened by the switching element (K1) when the current of the main circuit reaches a predetermined value, whereby the current starts flowing through a zero diode circuit formed of a zero diode (D1) arranged on a circuit, the amount of current in the zero diode circuit is monitored, and the main circuit is closed by the switching element (K1) when the zero diode circuit current reaches a predetermined value. <IMAGE>

IPC 1-7 (main, further and additional classification)

H05B 33/08

IPC 8 full level (invention and additional information)

H05B 33/08 (2006.01)

CPC (invention and additional information)

H05B 33/0815 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0948241 A2 19991006; EP 0948241 A3 20001227; FI 104034 B1 19991029; FI 104034 B 19991029; FI 980717 A0 19980330; FI 980717 A 19991001

INPADOC legal status


2002-07-31 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20011107

2001-09-12 [AKX] PAYMENT OF DESIGNATION FEES

- Ref Legal Event Code: AKX

- Free Format Text: AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

2001-08-08 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010626

2001-07-18 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20010516

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-12-27 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI

1999-10-06 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

1999-10-06 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI