Design Verification of a High-Peak-Current Multi-Leg Sine-Wave Inverter

Inhalt:
This paper is focused on the verification of a principle being very attractive for drive inverters which increasingly will demand for sinusoidal output voltages due to benefits like low EMI, simple motor cables, low noise operation and reduced motor losses. A multi-leg topology of interleaved half bridge stages is proposed, combining the leg output voltages by a network of coupled inductors. Due to the multilevel characteristic, the leakage of these inter-stage transformers is sufficient as filter inductance for the sine-wave filter. The inverter hence is tolerant to high peak output currents, being relevant, e.g., for high-dynamic servo drives. The paper presents a detailed inverter/filter dimensioning verified using a single phase laboratory setup.