초록 ▼

An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy source is designed for base load supply of t

An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy source is designed for base load supply of the electric machine, while the second energy source comprises an energy accumulator designed for a short-term peak load supply of the electric machine. Also, vehicle braking energy can be stored by way of the electric machine in its generator operating mode. According to the invention, the second energy source in the form of an energy accumulator is coupled via a bidirectional DC/DC converter to a supply connection of the first energy source connected with the direct-voltage connection of the electric machine.

대표청구항 ▼

1. 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 ad

1. 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.