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Machine translation
1. (WO1981003252) A SYSTEM FOR SWITCHING OFF AND POSSIBLE RELIGHTING OF SELECTED LAMPS IN A LIGHTING PLANT
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003252    International Application No.:    PCT/DK1981/000045
Publication Date: 12.11.1981 International Filing Date: 30.04.1981
IPC:
H02J 13/00 (2006.01), H05B 37/02 (2006.01)
Applicants:
Inventors:
Priority Data:
1921/80 01.05.1980 DK
Title (EN) A SYSTEM FOR SWITCHING OFF AND POSSIBLE RELIGHTING OF SELECTED LAMPS IN A LIGHTING PLANT
(FR) SYSTEME PERMETTANT D"ETEINDRE ET DE REALLUMER DES LAMPES SELECTIONNEES DANS UNE INSTALLATION D"ECLAIRAGE
Abstract: front page image
(EN)In order to night-extinguish selected lamps (PN) in a row of street lamps (P) a short DC signal is applied to the AC power supply wires (F1, F2), whereby respective detector receivers (M) in the single selected lamp units (PN), e.g. every second lamp in the row, are caused to actuate a switch (30) for the respective lamps. A DC signal will be effective for this purpose, while an AC signal of high frequency would be strongly attenuated because of the condensers as commonly used in modern lamp units. The use of DC signals may show the problem that during the switching on phase of the lamps the ohmic resistance is very low, whereby the DC signal would be more or less suppressed by a relighting of the night-extinguished lamps, if the DC current was not otherwise unacceptably high; according to the invention, however, the relighting is caused to take place only after termination of the DC signal. A plurality of separately power supplied rows of lamps may be operated for partial night-extinguishing by the DC signal on a first row being utilized for actuation of a DC signal generator in a following row, and so forth.
(FR)De maniere a eteindre de nuit des lampes selectionnees (PN) dans une rangee de reverberes (P), un signal a courant continu court est applique aux fils d"alimentation a courant alternatif (F1, F2), au moyen duquel des recepteurs de detecteurs respectifs (M) dans les lampes selectionnees (PN), p. ex. une lampe sur deux de la file, actionnent un commutateur (30) des lampes respectives. Un signal a courant continu est approprie a cet effet alors qu"un signal a courant alternatif de haute frequence serait fortement attenue a cause des condensateurs generalement utilises dans les lampes modernes. L"utilisation de signaux a courant continu peut causer le probleme suivant: pendant l"allumage en phase des lampes, la resistance ohmique est tres faible, ce qui pourrait supprimer plus ou moins le signal a courant continu en reallumant les lampes eteintes de nuit, si le courant continu n"etait pas par ailleurs excessivement eleve; selon l"invention, cependant, le reallumage ne s"effectue qu"a la fin du signal a courant continu. L"extinction nocturne partielle d"une pluralite de rangees de lampes alimentees en courant separement peut s"effectuer par application d"un signal a courant continu sur une premiere rangee, laquelle est utilisee pour actionner un generateur d"un signal a courant continu d"une rangee suivante, ainsi de suite.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)