EP 1540675 A4 20091111 - CONTROLLED INDUCTANCE DEVICE AND METHOD

Title (en)

CONTROLLED INDUCTANCE DEVICE AND METHOD

Title (de)

EINRICHTUNG UND VERFAHREN FÜR GESTEUERTE INDUKTIVITÄT

Title (fr)

DISPOSITIF ET PROCEDE D'INDUCTANCE CONTROLEE

Publication

EP 1540675 A4 20091111 (EN)

Application

EP 02775837 A 20020917

Priority

US 0229480 W 20020917

Abstract (en)

[origin: WO2004027793A1] Improved inductive apparatus (400) having controlled core saturation which provides a desired inductance characteristic with low cost of manufacturing. In one embodiment, a pot core (402) having a variable geometry gap is provided. The variable geometry gap allows for a "stepped" inductance profile with high inductance at low dc currents, and a lower inductance at higher dc currents, corresponding for example to the on-hook and off-hook states of a Caller ID function in a typical telecommunications line. In other embodiments, single- and multi-spool drum core devices are disclosed which use a controlled saturation element to allow for selectively controlled saturation of the core. Exemplary signal conditioning circuits (e.g., dynamically controlled low-capacitance DSL filters) using the aforementioned inductive devices are disclosed, as well as cost-efficient methods of manufacturing the inductive devices.

IPC 1-7

H01F 17/04; H01F 3/14

IPC 8 full level

H01F 3/14 (2006.01); H01F 17/04 (2006.01); H01F 17/06 (2006.01); H01F 21/06 (2006.01); H01F 41/04 (2006.01)

CPC (source: EP)

H01F 3/14 (2013.01); H01F 17/043 (2013.01); H01F 17/045 (2013.01); H01F 21/065 (2013.01); H01F 41/0213 (2013.01); H01F 41/045 (2013.01)

Citation (search report)

[XY] EP 0005386 A1 19791114 - TELECOMMUNICATIONS SA [FR]
[X] JP H11195541 A 19990721 - FUJI ELECTROCHEMICAL CO LTD
[XY] EP 0757364 A2 19970205 - THOMSON BRANDT GMBH [DE]
[XY] US 2002033747 A1 20020321 - ITO TORU [JP], et al
[DA] US 6212259 B1 20010403 - KIKO FREDERICK J [US]
[XA] US 3546571 A 19701208 - FLETCHER TAYLOR C, et al
See references of WO 2004027793A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

DOCDB simple family (publication)

WO 2004027793 A1 20040401; AU 2002341687 A1 20040408; CN 1695212 A 20051109; EP 1540675 A1 20050615; EP 1540675 A4 20091111

DOCDB simple family (application)

US 0229480 W 20020917; AU 2002341687 A 20020917; CN 02829883 A 20020917; EP 02775837 A 20020917