公开(公告)号：AU3993878A

公开(公告)日：1980-03-27

申请号：AU3993878

申请日：1978-09-18

Applicant: ASEA AB

Inventor： ARONSSON OLLE ,  FRANK KJELL ,  FRIDEN LARS ,  JOHANSSON JAN-GUSTAV

IPC: B60L3/04 ,  B60L15/04

Abstract: An improved traction apparatus for electrical vehicles that are supplied with energy over a contact line and that utilize a filter capacitor to smooth the input current to a DC convertor that is used to energize a driving motor. The improvement concerns means for avoiding surges of filter capacitor charging current when the line voltage rises after a line voltage drop. A thyristor is used to pass current to the convertor when the line voltage remains within a particular operational range and to block the flow of current to direct the current to a current limiting resistor when the line voltage begins to rise after a short duration or relatively longer duration voltage drop.