Installation for serial data transmission in a vehicle

Abstract

Abstract An installation for serial data transmission in a motor vehicle is described. It is composed of a symmetrically acting switching output stage, a double-wound balance-unbalance transformer connected downstream and a symmetrical transmission line which terminates the balance-unbalance transformer and is designed as a twisted two-wire line. The balance-unbalance transformer allows symmetrical signals to pass through virtually unimpeded but has a high impedance in the direction of the output stage or via its internal resistance to earth for non-symmetrical signals, that is to say common-mode signals. This results in a high degree of insulation of the output stage from the data line with respect to common-mode interference signals. When coming from the output stage these are reflected back into the output stage and when coming from the data line these are reflected back into the data line. By means of the high-impedance termination of the data line for common-mode signals, only small common-mode currents are formed along the data line and therefore it is also the case that only small common-mode-interlinked interference magnetic fields are formed. <IMAGE>

Inventors

• 👤 Peter Dr. Ing. Herges
• 👤 Ulrich Ing. Hipp
• 👤 Winfried Ing. Stiltz
• 👤 Thomas Ing. Thurner
• 👤 Klaus Ing. Feurer

Bibliographic Details