A 92.8%-Peak-Efficiency 60A 48V-to-1V 3-Level Half-Bridge DC-DC Converter with Balanced Voltage on a Flying Capacitor

📋 论文概要

本文提出了一种48V转1V的三电平半桥DC-DC转换器，实现了92.8%的峰值效率和60A的输出电流。通过飞电容电压平衡技术解决了高降压比下的效率挑战，适用于服务器和汽车等48V总线应用。

💡 主要创新点

• 采用三电平半桥结构，有效降低开关管电压应力，实现48V到1V的高降压比转换。
• 提出飞电容电压平衡控制方法，确保飞电容电压稳定在输入电压的一半，提高转换效率。
• 实现了60A大电流输出和92.8%的峰值效率，优于传统两电平方案。

🏷 关键词

📄 原文摘要

Samsung Electronics, Hwaseong, Korea 1 2 Demand for DC-DC voltage conversion from a 48V input has been on the rise due to proliferation of server and automotive applications with a 48V intermediate bus and 48V batteries, respectively. Compared to a 12V, the 48V architecture reduces the power loss thanks to the low distribution losses in the power delivery network. However, improving efficiency is a major challenge in the design of a 48V pointof-load (PoL) DC-DC converter due to the high step-down ratio and high output current. To improve conversion efficiency, several 48V PoL converters implemented with high-quality GaN transistors have been proposed [1-3]. However, the non-isolated hybrid converter in [1] shows a moderate peak efficiency of 90.9% and requires a large number of switches and passive elements. The isolated converter in [2] shows high efficiency and maximum output current of 80A, requiring a high conversion-ratio planar transformer of

👥 作者与机构

Minho Choi1,2, Deog-Kyoon Jeong1

Seoul National University, Seoul, Korea