EP 2693415 A1 20140205 - Line drive circuit for fire alarm system and corresponding fire alarm system
Title (en)
Line drive circuit for fire alarm system and corresponding fire alarm system
Title (de)
Leitungsansteuerung für ein Feueralarmsystem und entsprechendes Feueralarmsystem
Title (fr)
Circuit d'attaque de ligne pour système d'alarme incendie et système d'alarme incendie correspondant
Publication
Application
Priority
CN 201210270657 A 20120731
Abstract (en)
The present invention proposes a drive circuit and drive method for a fire alarm system. The drive circuit comprises: a current generation circuit, capable of selectively supplying either a first current I N1 or a second current I ALARM to the line, wherein the first current I N1 is used as a line monitoring current in a normal operating state, and the second current I ALARM is greater than the first current I N1 ; and a detection circuit, for controlling the current generation circuit to supply the second current I ALARM to the line when detecting that a line voltage V Line on the line is lower than a threshold V th , wherein the threshold V th is lower than a normal line voltage but higher than a maximum alarm voltage indicated on the line when the fire detector gives an alarm.
IPC 8 full level
G08B 29/06 (2006.01)
CPC (source: EP)
G08B 25/04 (2013.01); G08B 29/06 (2013.01)
Citation (search report)
- [YA] US 2007001819 A1 20070104 - BECKER DONALD E [US], et al
- [YA] US 5670937 A 19970923 - RIGHT ROBERT W [US], et al
- [A] EP 2136343 A1 20091223 - GEZE GMBH [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2693415 A1 20140205; CN 103578218 A 20140212; CN 103578218 B 20160518; RU 2013135767 A 20150210
DOCDB simple family (application)
EP 13172598 A 20130619; CN 201210270657 A 20120731; RU 2013135767 A 20130730