Design aspects of multi-phase interleaved resonant switched-capacitor converters with mm-scale air-core inductors

Abstract

This work explores design aspects of resonant switched-capacitor converters with respect to multi-phase interleaving and inductor design. In high-density or silicon-integrated ReSC converters, interleaving can not only significantly improve output voltage ripple but also efficiency and power density by reducing bypass capacitance requirements and thus providing more area for flying capacitance. An analytical approach to analyze voltage ripple in multi-phase designs is presented. Moreover, a design methodology for miniature air-core inductors for a multiphase ReSC converter is described and design trade-offs are discussed. Results of the ripple analysis and inductor design are compared with measurement results from a three phase ReSC prototype IC in 180 nm CMOS.

A High-Efficiency DC/DC Converter for High-Voltage-Gain, High-Current Applications

“…are reported in previous literatures [30][31][32][33][34][35][36]. Normally, the SC converter cannot simultaneously achieve good line and load regulation, and high efficiency [37][38][39][40]. If an accurate regulation is desired, the efficiency will be severely sacrificed [42][43][44].…”

Analysis and Design of High-Efficiency Modular Multilevel Resonant DC-DC Converter

“…As a result, high power density and high efficiency can be achieved. In low power areas, the converters based on the resonant switched-capacitor concept have fully integrated features [23], [24] and therefore have a very small form factor [25], [26], [27], [28], [29], [30], [31]. At medium and high power levels, utilizing stray inductance to achieve softswitching was proposed to eliminate magnetic components [32], [33], [34].…”