ZVS Flyback-Converter ICs Optimizing USB Power Delivery for Fast-Charging Mobile Devices to Achieve 93.5% Efficiency

📋 论文概要

本文提出了一种采用零电压开关（ZVS）技术的反激变换器IC，针对USB Power Delivery（PD）快充标准优化，实现了93.5%的高效率。该芯片支持3-21V宽电压范围和1-5A电流输出，通过次级侧调节（SSR）控制方案实现高精度动态调节，解决了移动设备快充中宽范围输出与高效率兼顾的难题。

💡 主要创新点

• 采用零电压开关（ZVS）技术降低开关损耗，提升反激变换器在宽输出范围内的效率至93.5%。
• 结合次级侧调节（SSR）控制方案，实现3-21V/1-5A宽范围输出且电压分辨率20mV、电流分辨率50mA的高精度调节。
• 针对USB PD PPS（可编程电源）标准优化，支持动态调整恒压恒流输出，满足快速充电需求。

🏷 关键词

📄 原文摘要

standard as a charging solution for mobile devices [1]. Moreover, the extended specification includes programmable power supply (PPS) which is suitable for fast charging mobile devices by allowing the power source to dynamically adjust the constant voltage (CV) and constant current (CC) output from 3 to 21V with 20mV and 1 to 5A with 50mA resolution, respectively. To meet such a wide range and fine resolution output voltage and current regulation, the flyback converter with the secondary-side-regulation (SSR) control scheme providing the direct output voltage and current feedback is adopted [2]. Conventionally, an optocoupler is used to feedback the compensation signal from the secondary side (SS) to the primary side (PS) of the power transformer. To avoid drawbacks of the opto-coupler, such as current transfer ratio (CTR) variation with

👥 作者与机构

Wei-Hsu Chang, Kun-Yu Lin, Chun-Ching Lee, Li-Di Lo, Jenn-Yu Lin, Ta-Yung Yang

Richtek, Hsinchu, Taiwan USB power delivery (PD) supporting up to 100W (20V/5A) is becoming a popular