Step-Up Switched-Capacitor Quasi-Resonant Converter With Continuous Conversion Ratio

Inherent disadvantages of conventional switched-capacitor converters (SCCs) are their discrete conversion ratio and inefficient energy transfer. To overcome these downsides, a switched-capacitor quasi-resonant pulsewidth-modulated converter is proposed. The operation stages and steady-state characteristics are described. Besides the theoretical analysis, experimental results for a step-up SCC are presented. The efficiency of this 100-W converter varies between 87% and 96% over a 30-40 V input voltage range with the output voltage between 80 and 160 V.