EP 1243165 A1 20020925 - CIRCUIT FOR OPERATING A GAS DISCHARGE LAMP
Title (en)
CIRCUIT FOR OPERATING A GAS DISCHARGE LAMP
Title (de)
SCHALTUNGSANORDNUNG ZUM BETREIBEN EINER GASENTLADUNGSLAMPE
Title (fr)
MONTAGE DE CIRCUITS PERMETTANT LE FONCTIONNEMENT D'UNE LAMPE A DECHARGE GAZEUSE
Publication
Application
Priority
- DE 19963289 A 19991227
- EP 0010557 W 20001026
Abstract (en)
[origin: US2003025466A1] In a circuit configuration to operate a gas discharge lamp (LA) the lamp (LA) is arranged in a full bridge circuit. A control circuit in normal operation actuates the four switches (S1-S4) in such a way that it changes over with a first frequency (f1) alternately between a first and a second state (T1, T2), whereby in the first state (T1) the two switches (S2, S3) of a first bridge diagonal are opened, one switch (S1) of the second bridge diagonal is closed and the other switch (S4) with a second frequency (f2), which is higher than the first frequency (f1), is alternately opened and closed. In the second state (T2) the four switches (S1-S4) are actuated in such a way that the lamp (LA) is pole reversed. In a start phase (TS) on the contrary the switch connected to the DC voltage source (S4) of a half-bridge is opened, the second switch (S3) of this half-bridge is closed, and the two switches (S1, S2) of the other half-bridge are with a third frequency (f3) alternately opened and closed. As a result reliable lamp starting is rendered possible and at the same time the generation of high-frequent alternating fields in normal operation is reduced.
IPC 1-7
IPC 8 full level
H05B 41/282 (2006.01); H05B 41/298 (2006.01)
CPC (source: EP US)
H05B 41/2828 (2013.01 - EP US); H05B 41/2988 (2013.01 - EP US)
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 2003025466 A1 20030206; US 6747423 B2 20040608; AT E245887 T1 20030815; AU 1275801 A 20010709; DE 19963289 A1 20010628; DE 50003045 D1 20030828; EP 1243165 A1 20020925; EP 1243165 B1 20030723; WO 0149082 A1 20010705
DOCDB simple family (application)
US 17917602 A 20020626; AT 00974462 T 20001026; AU 1275801 A 20001026; DE 19963289 A 19991227; DE 50003045 T 20001026; EP 0010557 W 20001026; EP 00974462 A 20001026