A 48-to-80V Input 2MHz Adaptive ZVT-Assisted GaNBased Bus Converter Achieving 14% Light-Load Efficiency Improvement

📋 论文概要

本文提出一种48-80V宽输入范围、2MHz开关频率的自适应零电压转换（ZVT）辅助GaN基总线转换器，通过在轻载条件下实现ZVT操作，减少了开关损耗，从而将轻载效率提升14%。

💡 主要创新点

• 提出自适应ZVT辅助技术，根据负载和输入电压动态调整ZVT时序，在全负载范围内优化效率。
• 采用e-mode GaN FETs并结合ZVT电路，解决了高压硬开关引起的dV/dt击穿和重叠损耗问题，实现了2MHz高频工作。
• 通过无源辅助电路实现ZVT，无需额外有源开关，降低了成本和复杂度。

🏷 关键词

📄 原文摘要

In modern hybrid electric vehicles, wide-input-range intermediate bus converters (IBCs) are essential in 48V power systems [1]. To increase the power efficiency, e-mode GaN FETs have been adopted in the IBCs [2, 3], as they offer much smaller on-resistance and thus conduction loss than silicon power FETs. However, even with GaN FETs, hard-switching (HS) power converters would still suffer from considerable turn-on V-I overlap loss and dV/dt kickback at high input voltages, degrading the light-load power efficiency, limiting the switching frequency (fSW) to 100s of kHz, and compromising the converter reliability. To address these issues, different soft switching schemes have been adopted to enable zero-voltage switching (ZVS) in HV power converters [4-6]. Conventional ZVS scheme [4, 5] can guarantee fixed switching frequency over a wide input range as compared to its resonant-based counterpart [6]. In [4], although a proper gate driver is

👥 作者与机构

Qi Cheng, Lin Cong, Hoi Lee

University of Texas at Dallas, Richardson, TX