METHOD AND DEVICE FOR CHARGING A BATTERY OF AN ELECTRICAL DRIVE USING COMPONENTS OF THE ELECTRICAL DRIVE

摘要

The invention relates to a multi-stage charging device for a battery of a battery operated electrical motor. The multistage charging device comprises a buck converter, an intermediate circuit and a boost converter in order to generate a suitable direct charging current from a (one or three-phase) alternating current provided by a power connection. According to the invention, components of the electrical drive are used for the boost converter and the intermediate circuit: the electrical motor functions as an intermediate circuit and the drive converter functions as a boost converter. According to the invention, the coupling of the electrical motor to the network-side buck converter occurs so that at least half the charging current flows through at least one of the at least three coils of the electrical drive. The invention further relates to a corresponding method and to a corresponding use of the drive components.

主权项

1. A charging device for charging a battery of a battery-operated electric drive, the charging device comprising:
a step-down converter which is connectable to a one- or three-phase AC network and is designed to provide a rectified current at its outputs; an intermediate circuit which is electrically connectable to at least one output of the step-down converter and has at least one inductor for smoothing the current; a step-up converter which is designed to be electrically connected to the step-down converter at at least one input via the intermediate circuit and is electrically connected to the battery at its outputs and which is suitable for converting the voltage provided by the step-down converter and/or the intermediate circuit into an equally high or higher voltage for charging the battery, wherein the step-up converter is formed by the drive converter of the electric drive and the intermediate circuit is formed by the electric motor of the electric drive; wherein during charging of the battery, a first connection of the coil of the electric motor is electrically connected to the step-down converter, and during the operation of the electric motor, a switch electrically connects the same connection of the coil to the step-up converter.