Performance of Phase-Shift Control Using High-Efficiency Switched-Capacitor-Based Resonant Converter

Abstract

Performance of a switched-capacitor-based resonant converter (SCRC) using a phase-shift control method realizes zero-voltage switching operation, and thus achieves high conversion efficiency. A theoretical analysis shows that the SCRC can reduce its inductor volume compared with a conventional buck converter when the output voltage range is within 19-81 % of its input voltage. Experimental results verify the operating characteristics of the proposed method and show the improved conversion efficiency of more than 99 %. Switchedcapacitor technology is widely used in low power DC-DC converter, especially in power management of the integrated circuit. These circuits have a limitation: high pulse currents will occur at the switching transients, which will reduce the efficiency and cause electromagnetic interference problems. This makes it difficult to use this technology in high-power-level conversion. The new design method for DC-DC converter with switched-capacitor technology. The proposed converter has no requirement for magnetic components and can achieve peak efficiency at full load. The experimental results verify the analysis and demonstrate the advantages.