Power supply network and method for charging at least one energy storage cell serving as energy storage for a DC voltage intermediate circuit in a power supply network

摘要

The invention relates to an energy supply network with an n-phase electrical machine (1), with n ≥ 1, and a controllable energy store (2) which is used to control and supply the electrical power to the electrical machine (1). The controllable energy store (2) has n parallel energy supply branches (3-1, 3-2, 3-3), each of which has at least two energy storage modules (4) connected in series, which each have at least one electrical energy storage cell (5) with one associated controllable coupling unit (6) are connected on the one hand to a reference rail (T-) and on the other hand to each phase (U, V, W) of the electrical machine (1). Depending on control signals, the coupling units (6) either bridge the respectively assigned energy storage cells (5) or they switch the respectively assigned energy storage cells (5) to the energy supply branch (3-1, 3-2, 3-3). The energy storage cells (5) of at least two energy storage modules (4) can each be connected to or disconnected from a DC voltage intermediate circuit (9) via a controllable switching network (8).