DC/AC INVERTER TO CONVERT DC CURRENT/VOLTAGE TO AC CURRENT/VOLTAGE

摘要

A DC/AC inverter is disclosed having two DC input terminals (1, 2), between which are connected an energy buffer capacitor (C), two output voltage terminals (3, 4) connected to filter section, switch configuration comprising the active switches (S1-S6), and freewheeling diodes (D1-D6) between the output voltage terminals (3, 4) and DC input terminals (1, 2) to provide real and/or reactive power to a public or islanded electric network. It is provided that, capacitive leakage currents occurring on the generator side be avoided while conserving high efficiency. This is achieved in that a freewheeling current path, is established for the line current (I_N) to freewheel through one of the freewheeling diodes (D3, D6) in conjunction with one of their respective parallel semiconductor switches (S3, S6) when the two output voltage terminals (3, 4) are decoupled from the DC input terminals (1, 2).