EP 1081988 A3 20020911 - Circuit for operating at least one discharge lamp
Title (en)
Circuit for operating at least one discharge lamp
Title (de)
Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe
Title (fr)
Circuit pour alimenter au moins une lampe à décharge
Publication
Application
Priority
DE 19941437 A 19990830
Abstract (en)
[origin: US6291947B1] The invention relates to a circuit arrangement for operating at least one discharge lamp, which has a half-bridge inverter (T1, T2, A) with a downstream load circuit (LD, CR) and has a half-bridge capacitor (CK) and also a monitoring apparatus for monitoring a change in the voltage drop across the half-bridge capacitor (CK) which is caused by the occurrence of a rectifying action in the at least one discharge lamp LP. According to the invention, the monitoring apparatus has a first RC element (R1, C1) and a second RC element (R2, C2), which are connected to one another by a threshold switch (DC), and means for detecting the switching state of the threshold switch (DC). The first RC element (R1, C1) is connected to the center tap of the half-bridge inverter, and the second RC element (R2, C2) is connected to the half-bridge capacitor (CK).
IPC 1-7
IPC 8 full level
H05B 41/24 (2006.01); H05B 41/298 (2006.01)
CPC (source: EP US)
H05B 41/2985 (2013.01 - EP US); Y10S 315/02 (2013.01 - EP US); Y10S 315/05 (2013.01 - EP US)
Citation (search report)
- [X] EP 0886460 A1 19981223 - HELVAR OY [FI]
- [A] WO 9743879 A1 19971120 - PHILIPS ELECTRONICS NV [NL], et al
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 6291947 B1 20010918; AT E281057 T1 20041115; CA 2317310 A1 20010228; DE 19941437 A1 20010301; DE 50008397 D1 20041202; EP 1081988 A2 20010307; EP 1081988 A3 20020911; EP 1081988 B1 20041027; JP 2001102192 A 20010413
DOCDB simple family (application)
US 64404100 A 20000823; AT 00116153 T 20000801; CA 2317310 A 20000829; DE 19941437 A 19990830; DE 50008397 T 20000801; EP 00116153 A 20000801; JP 2000256615 A 20000828