Global Patent Index - EP 2222137 B1

EP 2222137 B1 20101020 - System and method for automatic and safe detection of earth faults and interwire short circuits for DC lamp circuits

Title (en)

System and method for automatic and safe detection of earth faults and interwire short circuits for DC lamp circuits

Title (de)

System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen

Title (fr)

Système et procédé de détection automatique et sécurisée des défauts à la terre et courts-circuits internes pour les circuits de lampe CC

Publication

EP 2222137 B1 20101020 (EN)

Application

EP 09002228 A 20090218

Priority

EP 09002228 A 20090218

Abstract (en)

[origin: EP2222137A1] According to the invention, a driving circuit system (1) for driving at least two DC signal lamps (2a, 2b) comprises: a first DC power supply (3) having a first voltage (U 1 ) for driving the signal lamps (2a, 2b), a second DC power supply (4) having a second voltage (U 2 ) for driving only one of the signal lamps (2a, 2b), the negative poles of the first and second power supplies (3, 4) being on different potentials, a central amperemeter (6) provided between the two power supplies (3, 4), and driving circuits (10a, 10b) for each signal lamp (2a, 2b), each driving circuit (10a, 10b) comprising: - a first two-way change-over switch (S 1 ) connected to the positive pole of either the first or second power supply (3, 4), - a second two-way change-over switch (S 2 ) connected to the negative pole of either the first or second power supply (3, 4), - a third two-way change-over switch (S 3 ) connecting one wire (11) of the signal lamp (2a, 2b) to either the first or the second switch (S 1 , S 2 ), - a fourth two-way change-over switch (S 4 ) connecting the other wire (11) of the signal lamp (2a, 2b) to either the first or second switch (S 1 , S 2 ), - two local amperemeters (13) for measuring the current (I H , I R ) in both wires (11) of the signal lamp (2a, 2b), - a local voltmeter (14) for measuring the voltage (U A ) applied to the signal lamp (2a, 2b), and - a control unit (17) for controlling the four switches (S 1 -S 4 ) and for detecting both earth faults (EF) within a driving circuit (10a, 10b) and interwire short circuits (ISC) between two driving circuits (10a, 10b), based on the measured currents and voltages.

IPC 8 full level

H05B 37/03 (2006.01)

CPC (source: EP)

H05B 31/50 (2013.01); H05B 47/21 (2020.01)

Designated contracting state (EPC)

AT DE FR GB IT

DOCDB simple family (publication)

EP 2222137 A1 20100825; EP 2222137 B1 20101020; AT 485703 T 20101115; DE 602009000291 D1 20101202

DOCDB simple family (application)

EP 09002228 A 20090218; AT 09002228 T 20090218; DE 602009000291 T 20090218