A 48V-to-5V Buck Converter with Triple EMI Suppression Circuit Meeting CISPR 25 Automotive Standards existing at VSW can be largely suppressed, which reduces high-frequency EMI amplitude (bottom right of Fig. 8.11.2).

📋 论文概要

本文提出一种48V到5V的降压转换器，采用三重EMI抑制电路以满足CISPR 25汽车电磁兼容标准。解决了高转换比和高开关频率下严重的电磁干扰问题。

💡 主要创新点

• 提出三重EMI抑制电路架构，有效降低开关节点电压振铃和电磁辐射。
• 针对48V至5V极端转换比设计，结合高频开关实现紧凑方案。
• 集成GaN功率器件优化高频性能与EMI特性。

🏷 关键词

📄 原文摘要

Rong-Bin Guo1, Hsing-Yen Tsai1, Ke-Horng Chen1, Kuo-Lin Zeng1,2, Ying-Hsi Lin3, Shian-Ru Lin3, Tsung-Yen Tsai3 1 1 1 1 National Yang Ming Chiao Tung University, Hsinchu, Taiwan Chip-GaN Power Semiconductor, Hsinchu, Taiwan 3 Realtek Semiconductor, Hsinchu, Taiwan 1 2 In automotive-used switching regulator applications, the characteristic of extreme conversion ratio (48V to 5V) and high switching frequency (fSW) will give rise to considerable electromagnetic interference (EMI) issues, which is a tremendous obstacle to meeting CISPR 25 automotive standards. As shown in Fig. 8.11.1 (top), if VBattery and VSW nodes are considered, the EMI problem can be divided into two areas. Region I is caused by fSW harmonic tones (<50 MHz) and Region II is caused by VSW spurious ringing and high dv/dt of VSW (>50 MHz). Prior techniques utilize spread-spectrum modulation (SSM) to reduce noise at VSW by increasing fSW spread spectrum (ΔfSW) or decreasing

👥 作者与机构

Yi-Hsiang Kao , Chieh-Sheng Hung , Hui-Hsuan Chang , Wei-Cheng Huang ,