ENERGY RECOVERY DEVICE IN A VARIABLE-FREQUENCY DRIVE

摘要

The invention relates to a variable-frequency drive that includes a DC power supply bus with a positive line (16) and a negative line (17), an inverter module (14) powered by the DC bus for supplying a variable voltage to an electric load (M). The inverter includes a first DC/DC converter (20) having output terminals (20b) connected in series on the positive line (16) of the DC bus, a second DC/DC converter (30) having input terminals (30b) connected between the positive line (16) and the negative line (17) of the DC bus, a filtering capacitor (Cf) connected in parallel to the input terminals (20a) of the first converter (20) and to the first output terminals (30b) of the second converter (30), and an electric power storage module (Cs) connected in parallel to the second output terminals (30c) of the second converter (30).