EP 1133215 A2 20010912 - 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)
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)
Designated contracting state (EPC)
DE
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