Pulse transformer for a u-interface operating according to the echo compensation principle, and method for the manufacture of a toroidal tape core contained in a U-interface pulse transformer

US6118365A · kind A · utility

Assignee

• Vacuumschmelze GmbH & Co. KG · DE

Inventors

• Jörg Petzold · Bruchköbel, DE
• Johannes Beichler · Rodgau, DE
• Johannes Binkofski · Rodenbach, DE
• Giselher Herzer · Bruchköbel, DE
• Volker Kieespies · Gelnhausen, DE
• Luigi Caprarella · Hammersbach, DE
• Holger Wink · Gelnhausen, DE

Key dates

• Filing date: Mar 17, 1999
• Grant date: Sep 12, 2000
• Expiry date: Mar 17, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F41/0213
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In the ISDN telecommunication system, the connection between a digital local exchange and the network termination ensues via a public two-wire line at whose ends what are referred to as U-transformers reside. When the network termination leads to a terminal subscriber, then this is called a U.sub.k0 interface whereat the line length between the transformers can amount to up to 8 km. The bit error rate of the transmitted pulses must be <10.sup.-7, whereby the pulses have direct currents for the remote feed of the terminal subscribers that can amount to up to 80 mA superimposed on them. For such U.sub.K0 transformers, a toroidal tape core of a soft-magnetic, amorphous, magnetostriction-free alloy tape is employed. The manufactured toroidal tape core is tempered in a magnetic field, this thermal treatment ensuing in a protective gas atmosphere.