Capacitor charge balancing technique for a three-level PWM power converter

摘要: A power converter includes a DC to AC inverter that is connected neutral node formed between first and second capacitors across two supply lines. The operated selectively couple the lines an output terminal thereby producing alternating voltage waveform by sequence of pulses having positive, zero negative levels. To compensate for imbalance capacitors, compensation coefficient derived from difference in voltages direction current inverter. employed adjust width so as charge discharge correct imbalance.