Design of a PWM/PFM hybrid modulation switching circuit for a four-switch buck-boost converter

被引：2
|
作者：
Song, N. [1 ,2 ]
Fang, S. [1 ,2 ]
Zhao, C. [1 ,2 ]
Wang, Y. [3 ]
机构：
[1] Harbin Engn Univ, Coll Informat & Commun Engn, Harbin 150001, Peoples R China
[2] Minist Ind & Informat Technol, Key Lab Adv Marine Commun & Informat Technol, Harbin 150001, Peoples R China
[3] Dalian Maritime Univ, Sch Informat Sci & Technol, Dalian 116026, Peoples R China
来源：
25TH ANNUAL CONFERENCE & 14TH INTERNATIONAL CONFERENCE OF THE CHINESE SOCIETY OF MICRO-NANO TECHNOLOGY, CSMNT 2023 | 2024年 / 2740卷
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1088/1742-6596/2740/1/012031
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Based on the application background of fuel cell, the conversion efficiency of the four-switch Buck-Boost converter using PWM (Pulse width modulation) is low at light load, and the conversion efficiency of the four-switch Buck-Boost converter using PFM (Pulse frequency modulation) is low at heavy load. A PWM/PFM hybrid modulation circuit using digital module to detect induced current and feedback voltage is presented. The circuit structure is simple and easy to integrate. It has the effect of fast selection according to inductance current and feedback voltage. The circuit works in PWM mode by default. After soft startup, PWM/PFM mode can be switched according to the load. Finally, simulation is carried out in FSBB converter. The experimental results show that the PWM/PFM hybrid modulation circuit has the function of multi-load lead switching mode and protection mechanism. Simulation in FSBB converter shows that the converter efficiency reaches 91.99% and the maximum load current is 2A. This helps improve the efficiency of Buck-Boost converters.
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页数：11
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