Verlustarmer Leistungs-Wechselrichter

摘要

The invention pertains to a low-loss power current inverter. According to the invention, each current inverter phase (2) comprises an upper and a lower bridge half (6, 8) each of which contains two power semiconductor switches (T1, T2 and T3, T4) with back-to-back diodes (D1, D2 and D3, D4). One connection point (10, 12) of each power semiconductor switch pair (T1, T2, and T3, T4) is connected by a decoupling diode (D5, D6) to a connection point (M) of a direct voltage intermediate circuit (4). An auxiliary circuit (14) comprising an upper and a lower auxiliary switch (16, 18) and a resonance inductance (LR) is provided, as well as at least one resonance capacitor (CR) for the power semiconductor switches (T1... T4) of the current inverter phase (2). This arrangement results in a low-loss power current inverter which combines the advantages of a three-level inverter with those of an ARCP inverter.