EP 1133215 A3 20040107 - Method and ignition circuit for switching a high pressure lamp on and off
Title (en)
Method and ignition circuit for switching a high pressure lamp on and off
Title (de)
Verfahren und Schaltung zum Zünden einer Hochdruckentladungslampe
Title (fr)
Procédé et circuit d'amorçage d'une lampe à décharge haute pression
Publication
Application
Priority
FI 20000505 A 20000306
Abstract (en)
[origin: EP1133215A2] The invention relates to a method and an ignition circuit for switching a high pressure lamp on and off. A load circuit is capable of being short-circuited by means of a switch (3), which is connected in series with a primary winding (1) of a pulse transformer (1, 2) and whose on-off control is also used for generating ignition voltage pulses through a secondary winding (2) to a lamp (L). Upon a controlled closing of the switch (3) conductively for an extended period of time, a current ballast (Lk) will be subjected to a through-going short-circuit current for the load circuit and the lamp voltage falls to such a low level that the lamp is turned off. This lamp turn-off function can be used both for switching off a normally burning lamp and for terminating an abnormal status of gas discharge of a lamp not ignited between ignition attempts, in order to give the lamp a chance to cool down prior to another ignition attempt. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/04 (2006.01); H05B 41/292 (2006.01)
CPC (source: EP)
H05B 41/042 (2013.01); H05B 41/2925 (2013.01)
Citation (search report)
- [X] US 5962988 A 19991005 - NUCKOLLS JOE ALLEN [US], et al
- [DA] WO 9708921 A1 19970306 - TRIDONIC BAUELEMENTE [AT], 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 TR
DOCDB simple family (publication)
EP 1133215 A2 20010912; EP 1133215 A3 20040107; FI 107578 B 20010831; FI 20000505 A0 20000306
DOCDB simple family (application)
EP 01660040 A 20010302; FI 20000505 A 20000306