EP 2175700 A1 20100414 - Dimming circuit for discharging lamp capable of turning off under a low power condition
Title (en)
Dimming circuit for discharging lamp capable of turning off under a low power condition
Title (de)
Dimmkreislauf für Entladelampe mit Ausschaltfähigkeit bei niedriger Stromversorgung
Title (fr)
Circuit de gradation pour une lampe de décharge capable de se désactiver dans une condition de basse consommation
Publication
Application
Priority
EP 08017724 A 20081009
Abstract (en)
A dimming circuit (10) includes a resonant unit (11), a rectification unit (21), a half-bridge output unit (31), a first switch device (DD1) and a second switch device (DD2), and a selection unit (41). The rectification unit (21) is connected to the resonant unit (11). The half-bridge output unit (31) includes a first electric-controlled switch (Q1) and a second electric-controlled switch (Q2) in series. The first and second switch devices are connected to the second electric-controlled switch. The selection unit (41) may turn on the first switch device (DD1) and the second electric-controlled switch (Q2) when a potential is rising that turns on the discharging lamp (99) and turn off the second switch device (DD2) and keep turning on the second electric-controlled switch (Q2) when the discharging lamp (99) is lighting. The selection unit (41) further turns on the second switch device (DD2) to turn off the second electric-controlled switch (Q2) for turning off the discharging lamp (99) in a low power condition.
IPC 8 full level
H05B 41/285 (2006.01); H05B 41/392 (2006.01)
CPC (source: EP)
H05B 41/2853 (2013.01); H05B 41/3924 (2013.01)
Citation (search report)
- [XY] JP 2001244097 A 20010907 - TOSHIBA LIGHTING & TECHNOLOGY
- [A] US 6169374 B1 20010102 - CHANG CHIN [US]
- [Y] WO 2006120629 A2 20061116 - KONINKL PHILIPS ELECTRONICS NV [NL], et al
- [X] WO 2004110110 A1 20041216 - MATSUSHITA ELECTRIC IND CO LTD [JP], et al
- [X] US 2004263093 A1 20041230 - MATSUBAYASHI YOKO [JP], et al
- [A] US 2002017877 A1 20020214 - OOSTVOGELS LUDOVICUS F J [NL], et al
- [A] US 2001030514 A1 20011018 - TAKAHASHI KENICHIRO [JP], et al
- [A] US 6111368 A 20000829 - LUCHACO DAVID G [US]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
DOCDB simple family (application)
EP 08017724 A 20081009