EP 0852453 B1 20000816 - Electronic ballast for a discharge lamp, provided with a lamp power measurement by means of a DC-signal
Title (en)
Electronic ballast for a discharge lamp, provided with a lamp power measurement by means of a DC-signal
Title (de)
Elektronisches Vorschaltgerät einer Gasentladungslampe mit Messung der Lampenleistung durch ein Gleichstromsignal
Title (fr)
Ballast électronique pour une lampe à décharge, avec mesure de la puissance de la lampe en utilisant un signal à courant continu
Publication
Application
Priority
FI 970018 A 19970103
Abstract (en)
[origin: EP0852453A1] The invention relates to a controllable or dimmable electronic ballast for a low pressure discharge lamp, especially a fluorescent lamp. A halfbridge inverter (TR1, TR2; V2, V3) supplies power to a load circuit (L2, C2, C3, LL). A regulation or control block (A1/I, II) regulates the frequency of the halfbridge inverter for regulating the light output of a lamp. One branch of the halfbridge inverter is provided with current measuring elements (R2, R3, C4), from which is obtained current measurement information proportional to the load circuit power for the regulation or control block, which is further supplied separately with measurement information about a direct current that has passed through the lamp and is proportional to the internal resistance of the lamp. The latter measurement information is used for controlling regulation of the lamp at low regula tion levels of the light output. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/392 (2006.01)
CPC (source: EP)
H05B 41/3925 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0852453 A1 19980708; EP 0852453 B1 20000816; DE 69702829 D1 20000921; DE 69702829 T2 20001207; FI 101188 B1 19980430; FI 101188 B 19980430; FI 970018 A0 19970103
DOCDB simple family (application)
EP 97660149 A 19971219; DE 69702829 T 19971219; FI 970018 A 19970103