Global Patent Index - EP 1171935 B1

EP 1171935 B1 2003-06-11 - ACTIVE MATERIAL LOW POWER ELECTRICAL SWITCHING MECHANISM AND DRIVE CIRCUIT THEREFOR

Title (en)

ACTIVE MATERIAL LOW POWER ELECTRICAL SWITCHING MECHANISM AND DRIVE CIRCUIT THEREFOR

Title (de)

ELEKTRISCHER KLEINLEISTUNGSSCHALTMECHANISMUS MIT AKTIVEN MATERIAL UND ZUGEHÖRIGER STEUERSCHALTUNG

Title (fr)

MECANISME DE COMMUTATION ELECTRIQUE DE FAIBLE PUISSANCE A MATIERE ACTIVE ET CIRCUIT DE COMMANDE DESTINE A CE DERNIER

Publication

EP 1171935 B1 (EN)

Application

EP 00927432 A

Priority

  • GB 0001508 W
  • GB 9908930 A

Abstract (en)

[origin: WO0064022A1] A drive circuit for a residual current device comprises a transformer having a first and second primary coil each having n1 turns, and a secondary coil having n2 turns arranged to output a drive voltage responsive to any current imbalance between the respective electric currents flowing in the first and second primary coils. In order to achieve as high a drive voltage as possible the transformer is arranged to saturate at a relatively low level of current imbalance thus causing the back-EMF voltage generated across the secondary coil to spike resulting in a low power high voltage drive signal being output. Preferably, the secondary coil output is rectified, smoothed, and multiplied before being used as a drive signal for an active material bender used as an actuator in a circuit breaker mechanism.

IPC 1-7 (main, further and additional classification)

H02H 3/33; H01H 71/12

IPC 8 full level (invention and additional information)

H01H 83/02 (2006.01); H01H 71/12 (2006.01); H01H 83/22 (2006.01); H02H 3/33 (2006.01); H01H 71/40 (2006.01)

CPC (invention and additional information)

H01H 71/12 (2013.01); H01H 83/226 (2013.01); H01H 71/127 (2013.01); H01H 71/40 (2013.01)

Designated contracting state (EPC)

DE ES FR GB IT NL

EPO simple patent family

WO 0064022 A1 20001026; AU 4583800 A 20001102; CN 1347583 A 20020501; DE 60003305 D1 20030717; DE 60003305 T2 20040429; EP 1171935 A1 20020116; EP 1171935 B1 20030611; GB 9908930 D0 19990616; HK 1041620 A1 20031121; JP 2002542754 A 20021210

INPADOC legal status


2008-04-30 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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