EP 0432625 B1 19940309 - Main-standby filament switch for AC driven two-filament lamps in traffic signalling devices.
Title (en)
Main-standby filament switch for AC driven two-filament lamps in traffic signalling devices.
Title (de)
Haupt/Nebenfadenumschalter für wechselstromgespeiste Doppelfadenlampen in Verkehrssignalanlagen.
Title (fr)
Commutateur filament principal-secours pour lampes à double filament alimentées en courant alternatif dans des installations de signalisation du trafic.
Publication
Application
Priority
DE 8914703 U 19891214
Abstract (en)
[origin: EP0432625A1] The main/standby filament switch is controlled by a main filament monitor. The latter is constructed as an optocoupler (U1) which is coupled on the input side, e.g. in the form of a transformer (T2), to the main filament circuit. The switching transistor of the optocoupler is at a DC voltage and, when it is set, short-circuits a light-emitting diode, which is at a supply voltage, or separates its supply circuit. This light-emitting diode is the transmitting diode of an electro-optically controllable AC switch (U2), whose receiving diodes are connected via the standby filament (NF) of the lamp (L) to the supplying current supply device (T1). When current is flowing through the light-emitting diode, the AC switch switches through an AC switch (TR) arranged in the circuit of the standby filament. The main/standby filament switch has exclusively electronic switches for carrying out the switching processes required. <IMAGE>
IPC 1-7
IPC 8 full level
B61L 5/18 (2006.01); G08G 1/097 (2006.01); H05B 39/10 (2006.01)
CPC (source: EP)
B61L 5/1881 (2013.01); G08G 1/097 (2013.01); H05B 39/10 (2013.01)
Designated contracting state (EPC)
AT CH DE DK ES FR GB IT LI LU NL
DOCDB simple family (publication)
EP 0432625 A1 19910619; EP 0432625 B1 19940309; AT E102780 T1 19940315; DE 59004905 D1 19940414; DE 8914703 U1 19900222; DK 0432625 T3 19940620; ES 2051444 T3 19940616; FI 906150 A0 19901213; FI 906150 A 19910615; FI 97674 B 19961015; FI 97674 C 19970127
DOCDB simple family (application)
EP 90123331 A 19901205; AT 90123331 T 19901205; DE 59004905 T 19901205; DE 8914703 U 19891214; DK 90123331 T 19901205; ES 90123331 T 19901205; FI 906150 A 19901213