An 8.3MHz GaN Power Converter Using Markov Continuous RSSM for 35dBμV Conducted EMI Attenuation and One-Cycle TON Rebalancing for 27.6dB VO Jittering Suppression

📋 论文概要

该论文提出了一种基于马尔可夫连续随机扩频调制（RSSM）的GaN功率转换器，工作频率为8.3MHz，通过随机化开关频率有效抑制传导电磁干扰（EMI），实现了35dBμV的EMI衰减。同时，采用单周期导通时间重平衡技术（One-Cycle TON Rebala）来维持输出电压调节精度，解决了高频GaN转换器中EMI与性能之间的权衡问题。

💡 主要创新点

• 提出马尔可夫连续随机扩频调制（RSSM）技术，通过随机化开关频率实现35dBμV的传导EMI衰减，优于传统SSM方法。
• 引入单周期导通时间重平衡（One-Cycle TON Rebala）机制，在随机调制下保持输出电压的快速调节和稳定性。
• 在8.3MHz高频GaN功率转换器中同时实现了低EMI和高效率，验证了GaN器件在高频应用中的优势。

🏷 关键词

📄 原文摘要

GaN power switches have gained fast-growing popularity in power electronics. With a similar RDS_ON resistance, they boast 2-to-3-order lower gate capacitance than silicon counterparts, making them highly desirable in high-frequency (fSW), high-performance power converters. However, at high fSW, switching transitions have to be completed in much shorter times, creating much larger di/dt and dv/dt changes in power stage, which directly link to electromagnetic-interference (EMI) emissions [1]. To suppress EMI, spread-spectrum-modulation (SSM) techniques [2-5] have been proposed. As depicted in Fig. 15.7.1, a periodic SSM (PSSM) is straightforward and easy to implement. However, its EMI suppression is not effective [2]. A randomized SSM (RSSM) can outperform the PSSM, with lower peak EMI and near-uniform noise spreading, but its performance highly relies on the random clock design. In [3], an N-bit digital random clock was reported to

👥 作者与机构

Yingping Chen, D. Brian Ma

University of Texas at Dallas, Richardson, TX