Six-level single-leg flying capacitor converter voltage balancing dynamics analysis

Natural voltage balancing property is an attractive feature of a flying capacitor converter. In this paper, time domain approach based on stitching piece-wise analytical solutions for consecutive switching intervals is applied to a six-level single-leg flying capacitor converter. The small parameter approximation analysis yields physically meaningful, simple, and accurate expressions for average voltage balancing dynamics giving an in-depth insight into parameters and carrier frequency impact for carrier-based phase-shifted DC PWM.