高轻载效率少功率器件的可模块化扩展ZVS高增益变换器
Modularly Expandable ZVS High-gain Converter With High Light-load Efficiency and Reduced Power Components
许兴 1秦岭 1茅靖峰 1杨毓 1段冰莹 1周磊1
作者信息
- 1. 南通大学电气工程学院,江苏省 南通市 226019
- 折叠
摘要
提出一种高轻载效率且少功率器件的可模块化扩展零电压开关高增益Boost变换器.该变换器可以通过增加升压模块数量n,极大地提高变换器的升压能力;具有2个开关管和n + 1 个二极管,且各功率管承受相同的电压应力,均为[(n + 1)Uin + Uo]/(n + 2);输入电感工作在连续导通模式,其余电感工作在双向导通模式,且反向峰值电流之和大于输入电感电流的谷值,从而实现所有功率管的软开关.所提变换器采用柔性开关频率控制策略,即根据输入电压和负载大小适当地调整开关频率,使电感电流脉动量维持在合适的范围内,既确保实现功率管的软开关,又具有较小的通态损耗,因此在整个负载范围内均具有较高的运行效率.以一个扩展模块为例,对所提变换器的工作原理、稳态特性、软开关条件、控制方法进行深入分析,并通过一台 250 W 的样机实验验证了理论分析的正确性.
Abstract
In this paper,a modularly expandable zero voltage switching(ZVS)high-gain boost converter with high light-load efficiency and reduced power components is proposed.The proposed converter can enhance voltage gain by increasing the number of step-up modules(n).It consists of 2 switches and(n + 1)diodes,which suffer from low voltage stress of[(n + 1)Uin + Uo]/(n + 2).In addition,the input inductor is operated in continuous conduction mode;other inductors are operated in continuous bidirectional conduction mode and the sum of their reverse peak current must be higher than the valley value of the input inductor current.Benefiting from this design method,all power semiconductors realize soft-switching.Besides,a flexible-switching-frequency control method is employed,which involves adjusting the switching frequency through a lookup table based on input voltage and load conditions.This approach limits the peak current of inductors to within a specified range.Consequently,the soft-switching condition is fulfilled,and the current stress and conduction loss are minimized,leading to an improved light-load efficiency.In this paper,the working principle,steady-state characteristics,soft-switching conditions,and control methods of the proposed converter are analyzed in detail,and the correctness of the theoretical analysis is verified with a 250 W experimental prototype.
关键词
Boost变换器/高增益/低电压应力/零电压开关/柔性开关频率Key words
Boost converter/high voltage gain/low voltage stress/zero voltage switching(ZVS)/flexible-switching-frequency引用本文复制引用
基金项目
江苏省高等学校自然科学研究项目(20KJA470002)
南通市社会民生科技计划面上项目(MS12021015)
江苏省大学生创新创业训练计划一般项目(202210304113Y)
出版年
2024
国家科技期刊平台
NSTL
万方数据