A research development of high step down ratio, high power density integrated hybrid DC-DC converter

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04440
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Shinshu University
• Principal Investigator: Miyaji Kousuke 信州大学, 学術研究院工学系, 准教授 (80635467)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 集積回路設計 / 電源回路 / DC-DCコンバータ / ハイブリッドコンバータ / スイッチトキャパシタ

Outline of Final Research Achievements

This research presents high power density hybrid converters that combine switched capacitor and inductive switching power stage for high voltage conversion ratio power conversion targeted for server and electric vehicle applications. Specifically, 24V input 1V output Dual Path Charging Dual Inductor Hybrid (DCP-DIH) converter and 48V input 1V output Parallel-Symmetric DIH (PS-DIH) converter have been proposed to improve the step-up load transient response and line transient response including start-up event. Both converters have been implemented in a high voltage BCD process achieving high voltage conversion ratio, good efficiency from 80 to 85%. The voltage drop during step-up load transient is suppressed by 55 to 57%, and startup time is reduced by 86% compared to the conventional DIH converter.

Free Research Field

集積電源回路設計

Academic Significance and Societal Importance of the Research Achievements

本研究はたくさんの降圧電源を使うことなく1段で12Vから48Vの高いバス電圧から1Vまで高効率に変換可能な高降圧電源を実現し、サーバーや電気自動車内電源など様々なアプリケーションにおいて電源の小型化、高密度化を推進することが可能である。また、効率だけでなく、負荷に接続される電源として重要な負荷変動や入力電圧変動に対しても高い応答性能を示す制御手法まで確立した点で、より高降圧電源の実用化に向けて貢献した。