EP 0853445 A1 19980715 - Controllable or dimmable electronic ballast provided with a lamp power measurement
Title (en)
Controllable or dimmable electronic ballast provided with a lamp power measurement
Title (de)
Elektronisches Vorschaltgerät mit Helligkeitssteuerung und Messung der Lampenleistung
Title (fr)
Ballast électronique réglable et équipé pour mesure la puissance de la lampe
Publication
Application
Priority
FI 970017 A 19970103
Abstract (en)
The invention relates to a controllable or dimmable electronic ballast provided with a lamp power measurement for a low-pressure discharge lamp, especially a fluorescent lamp. A halfbridge inverter (TR1, TR2; V2, V3) supplies high-frequency alternating current into a load circuit including a discharge lamp (LL). A regulation or control block (A1/I, II) controls light output of the lamp by regulating frequency of the inverter. Measurement information about a current proportional to the load circuit power is fed to the regulation or control block, which is also supplied with measurement information about a voltage proportional to a current passing through the filament of the lamp, the latter information being used for compensating the effect of filament power out of the measuring result of the load circuit power. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/392 (2006.01)
CPC (source: EP)
H05B 41/3925 (2013.01)
Citation (search report)
- [XP] WO 9701945 A1 19970116 - PHILIPS ELECTRONICS NV [NL], et al
- [A] EP 0422255 A1 19910417 - SIEMENS AG [DE]
- [A] US 5424611 A 19950613 - MORIARTY JR JOHN K [US]
- [A] EP 0707438 A2 19960417 - TRIDONIC BAUELEMENTE [AT]
- [AP] US 5612595 A 19970318 - MAHESHWARI AJAY [US]
- [A] EP 0461441 A1 19911218 - ZUMTOBEL AG [AT]
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0853445 A1 19980715; FI 101187 B1 19980430; FI 101187 B 19980430; FI 970017 A0 19970103
DOCDB simple family (application)
EP 97660148 A 19971219; FI 970017 A 19970103