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Resonant Switched-capacitor Converters with Wide Line Regulation Range and Control Maps for PWM plus Phase-shift Modulated DC-DC Converters

Abstract

Part I: Resonant Switched-capacitor Converters with Wide Line Regulation Range

The traditional switched-capacitor converter (SCC) typically comes with the shortcomings of high transient current spike, hard-switched operation and limited line regulation range. In this thesis, a family of resonant two-switch boosting switched-capacitor converter (RTBSC) and a family of Ladder resonant switched-capacitor converter (RSC) with low transient current spike, soft-switching operation and wide line regulation range are proposed. By inserting a small resonant inductor, the additional benefit of reduction of one or two bulky capacitor banks to much smaller resonant capacitor(s) is obtained. By operating above the resonant frequency, the transistors are ZVS turned on and diodes are zero-current-switching (ZCS) turned off. Most importantly, the voltage-gain range is significantly expanded. This resonant configuration is applicable to TBSC, Ladder SCC and the Dickson SCC.

However, the regulation capability of the proposed RTBSC and Ladder RSC is still a challenge at light load condition. To ease this issue, a family of step-up resonant switched-capacitor converter (RSC) with continuously adjustable conversion ratio is proposed based on the Cuk Dual Resonance Core (DRC) concept. By adopting the on-time fixed frequency modulation, its conversion ratio can vary continuously and efficiently even at the light load condition (1/10 of the rated power). The configuration of Cuk DRC is applicable to the Series-parallel (SP) SCC, Fibonacci SCC, Voltage Doubler (VD) and Dickson SCC.

Part II: Control Maps for PWM plus Phase-shift Modulated DC-DC Converters

In this part, comprehensive analyses about the operation principle, power transmission capability, component stress and the zero-voltage-switching (ZVS) operation region for a three-level PWM plus phase-shift (PPS) modulated bidirectional push-pull converter and a family of two-level PPS modulated isolated bidirectional DC-DC converters (IBDCs) are presented. Based on the analyses, a set of control maps is established to assist converter operation and design in the low-circulating-current regions, high-power-transmission-capability regions, and ZVS operation regions. In the control maps, a circuit parameter is identified, providing a design limit to select switching frequency, leakage inductance, turns ratio and power level of the PPS modulated DC-DC converters.

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