Global Patent Index - EP 0716435 A4

EP 0716435 A4 19961120 - PRINTED COIL TRANSFORMER

Title (en)

PRINTED COIL TRANSFORMER

Title (de)

TRANSFORMATOR MIT GEDRUCKTEN SPULEN

Title (fr)

TRANSFORMATEUR A BOBINES IMPRIMEES

Publication

EP 0716435 A4 19961120 (EN)

Application

EP 95921971 A 19950615

Priority

  • JP 9501195 W 19950615
  • JP 14770294 A 19940629

Abstract (en)

[origin: WO9600972A1] A flat transformer in which the central leg (33) of an EE-shaped core or EI-shaped core is provided at the center of the spiral of a laminated coil body which is formed by stacking spiral coils with an insulating resin to magnetically couple the spiral coils to each other. The cross-sectional area of the side legs (34) of the core is nearly equal to that of the connecting part (35) of the core, and the cross-sectional area (Ae) of the central leg (33) is nearly the double of that of the side leg (34). The cross-sectional area (Ae) and the volume (Ve) of the core meets the following inequalities: 1.4 </= Ve<1/3>/Ae<1/2> </= 1.7. The interval (w) between the central leg (33) and side legs (34) and the height of the central leg (33) meet the following inequalities: 0.5 </= h/w </= 2.

IPC 1-7

H01F 30/00

IPC 8 full level

H01F 17/00 (2006.01); H01F 17/04 (2006.01)

CPC (source: EP)

H01F 17/0006 (2013.01); H01F 17/04 (2013.01)

Citation (search report)

  • [A] EP 0068745 A1 19830105 - TDK CORP [JP]
  • [A] GB 2059166 A 19810415 - KIJIMA MUSEN KK
  • [A] GB 2087656 A 19820526 - ANALOG DEVICES INC
  • [A] EP 0245083 A1 19871111 - TDK CORP [JP]
  • [A] EP 0267822 A1 19880518 - DASSAULT ELECTRONIQUE [FR]
  • [A] "FX3700 series transformer cores and coil formers for SMPS", MULLARD TECHNICAL COMMUNICATIONS, JAN. 1975, UK, vol. 13, no. 125, ISSN 0027-3139, pages 225 - 228, XP002014291
  • [A] R. SIBILLE: "Noyaux en ferrites pour alimentation a découpage", ONDE ELECTRIQUE, vol. 59, no. 12, December 1979 (1979-12-01), PARIS FR, pages 71 - 80, XP002014203
  • [A] CHONG H AHN: "A planar micromachined spiral inductor for integrated magnetic microactuator applications", JOURNAL OF MICROMECHANICS AND MICROENGINEERING, vol. 3, no. 2, June 1993 (1993-06-01), ATLANTA,USA, pages 37 - 44, XP002014204
  • See references of WO 9600972A1

Designated contracting state (EPC)

DE

DOCDB simple family (publication)

WO 9600972 A1 19960111; EP 0716435 A1 19960612; EP 0716435 A4 19961120; TW 436823 B 20010528

DOCDB simple family (application)

JP 9501195 W 19950615; EP 95921971 A 19950615; TW 84106066 A 19950614