具有准谐振、动态采样功能的反激式原边反馈电源管理芯片  

Flyback Primary-Side Feedback Power Management Chip with Quasi-Resonant and Dynamic Sampling Function

作　　者：林洁 牟维凤 谢加雨 程鹏铭 李嘉鹏 雷登宇 Lin Jie;Mou Weifeng;Xie Jiayu;Cheng Pengming;Li Jiapeng;Lei Dengyu(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 401320,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆401320

出　　处：《半导体技术》2025年第2期147-153,共7页Semiconductor Technology

基　　金：重庆市科委博士直通车科研项目(CSTB2022BSXM-JCX0119)。

摘　　要：为降低反激式变换器开关损耗和提高输出电压精度,设计了一种具有准谐振(QR)和动态采样功能的交流/直流(AC/DC)反激式原边反馈电源管理芯片。在断续导通模式(DCM)下,当次级电流降低为零时,开关管漏极产生谐振,准谐振电路能够检测到谐振电压的最低点,实现谷底导通,理论上能降低开关损耗和电磁干扰(EMI)。并采用随负载变化而改变采样点的方式来提高输出电压的精度。采用华虹90 nm BCD工艺制作了AC/DC反激式电源管理芯片,在交流输入电压85~265 V的测试条件下,实现了谷底导通,芯片平均效率为76.7%,在输入电压最大且满载情况下效率最高为83%。To reduce switching losses and improve output voltage accuracy in flyback converters,a AC/DC flyback primary-side feedback power management chip with quasi-resonant(QR)and dynamic sampling functions was designeel.In the discontinuous conduction mode(DCM),resonance occurs at the drain of the switch when the secondary current is reduced to zero.The QR circuit can detect the lowest point of the resonant voltage,realizing valley conduction,which theoretically can reduce switching losses and electromagnetic interference(EMI).This design dynamically adjusts the sampling point according to load variations to enhance output voltage accuracy.An AC/DC flyback power management chips with Hua Hong's 90 nm BCD process was fabricated.It achieves valley conduction under an AC input voltage range of 85-265 V,with an average chip efficiency of 76.7%and efficiency up to 83%at maximum input voltage and full-load.

关 键 词：BCD工艺 准谐振 原边反馈 开关损耗 动态采样 

分 类 号：TN710.4[电子电信—电路与系统] TN433