Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter

In this article, a step-up seven-level inverter supplied by single dc source suitable for renewable energy application is presented. Forming the desired output realized charging capacitors and synthesizing them based on switched-capacitor concept. This structure praised ability of sensorless voltage balancing capacitors, reducing control complexity to produce bipolar staircase waveform. It also benefits from regenerative performance, avoiding unwanted overvoltage. A phase disposition pulsewidth modulation (PD-PWM) technique utilized circuit operation. Furthermore, comparison with other recent topologies reveals that losses, number semiconductor devices, gate driver circuits are reduced. Theoretical analysis verified through laboratory prototype implementation. Experimental results under various types loads approve performance proposed validity design. Finally, maximum experimental efficiency 94.3% (115 V, 250 W load) was reached.