CHARGING CIRCUIT FOR AN ENERGY STORAGE DEVICE AND METHOD FOR CHARGING AN ENERGY STORAGE DEVICE

摘要

The invention relates to a charging circuit for an energy storage device (1), having a multiplicity of energy supply branches (Z) each with a multiplicity of energy storage modules (3) for generating an AC voltage at a multiplicity of output connections (1a, 1b, 1c) of the energy storage device (1). The charging circuit has a first half-bridge circuit (9) having a multiplicity of first supply connections (8a, 8b, 8c) each coupled to one of the output connections (1a, 1b, 1c) of the energy storage device (1), a first supply node (37a; 37b; 47a; 47b) coupled to the first half-bridge circuit (9), a second supply node (37a; 37b; 47a; 47b) coupled to a reference potential rail (4) of the energy storage device (1), a converter inductor (10) connected between the first supply node (37a; 37b; 47a; 47b) and the first half-bridge circuit (9), a diode half-bridge (32) coupled between the first supply node (37a; 37b; 47a) and the second supply node (37a; 37b; 47b), and a supply circuit (35; 44, 45) designed to at least occasionally provide a charging DC voltage (UL) between the first supply node (37a; 37b; 47a; 47b) and the second supply node (37a; 37b; 47a; 47b). In this case, the first half-bridge circuit (9) has a multiplicity of semiconductor switches (9c) each coupled between the first supply node (37a; 37b; 47a; 47b) and one of the multiplicity of first supply connections (8a, 8b, 8c).

主权项

1. A charging circuit for an energy storage device (1), which has a multiplicity of energy supply branches (Z) each with a multiplicity of energy storage modules (3) for generating an AC voltage at a multiplicity of output connections (la, 1b, 1c) of the energy storage device (1), comprising:
a first half-bridge circuit (9) having a multiplicity of first supply connections (8a, 8b, 8c) each coupled to one of the output connections (1a, 1b, 1c) of the energy storage device (1); a first supply node (37a; 37b; 47a; 47b) coupled to the first half-bridge circuit (9); a second supply node (37a; 37b; 47a; 47b) coupled to a reference potential rail (4) of the energy storage device (1); a converter inductor (10) connected between the first supply node (37a, 37b; 47a; 47b) and the first half-bridge circuit (9); a diode half-bridge (32) coupled between the first supply node (37a; 37b; 47a) and the second supply node (37a; 37b, 47b); and a supply circuit (35; 44, 45) configured to at least occasionally provide a charging DC voltage (UL) between the first supply node (37a; 37b; 47a; 47b) and the second supply node (37a; 37b; 47a; 47b), wherein the first half-bridge circuit (9) has a multiplicity of semiconductor switches (9c) each coupled between the first supply node (37a; 37b; 47a; 47b) and one of the multiplicity of first supply connections (8a, 8b, 8c).