Patent ID: 6404151
Filing Date: 2002-06-11
Classification: B60L,H02J,H02M,Y02T

Abstract:
An electric vehicle drive, comprising:an electric machine which can be driven alternatively as a motor or as a generator, and which has a direct voltage connection to which a supply voltage can be applied from a first energy source and a second energy source; wherein the first energy source is adapted to provide a base load power supply of the electric machine; the second energy source comprises an energy accumulator which is adapted for a short-term peak load supply of the electric machine, and for storing vehicle braking energy generated by the electric machine when operated as a generator; and the second energy source is coupled by way of a bidirectional DC/DC converter to a supply connection of the first energy source, which is connected with the direct-voltage connection of the electric machine; wherein the bidirectional DC/DC converter comprises first and second voltage system converters of the same construction, which can be controlled in a timed manner in a single-phase bridge; and said voltage converters of said first and second converters are inductively coupled via a transformer having a first and second windings; one transformer winding being disposed respectively in the bridge arm of each said first and second converters.