Abstract

Switched-capacitor converters (SCCs) are subset of switched-mode converters which can be designed to buck/boost the input voltage. However, synthesizing SCC has been a challenging task due to the large number of possible circuit realizations. This work proposes a synthesis method for constructing an efficient reconfigurable SCC that adheres to the Fibonacci canonical structure. The optimization is achieved by operating the converter with the minimum number of capacitors required to achieve a certain voltage conversion ratio (VCR). Indeed, decreasing the number of flying capacitors minimizes the equivalent output resistance of the converter which improves the converter performance, like the settling time and the power conversion efficiency (PCE). Moreover, by analyzing the differences between each VCR terminal, the number of switches required to create a unique VCR is also decreased. The performance of the proposed synthesis tool is verified using SPICE simulations for 4-stage reconfigurable SCC. The simulated converter efficiency ranges from 85% to 95% for a 50mA load tested at 1 MHz switching frequency, compared to 43.5% to 86% using the conventional method. The performance of the converter is compared with recent reconfigruable SCCs in the literature.