一种高功率因数低母线电压单级LLC AC/DC变换器  

Single-stage LLC AC/DC Converter with High Power Factor and Low Bus Voltage

作　　者：高敬祥 张俊洪[1] 宋庆国[3] 崔晶晶 彭赛阳[2] GAO Jingxiang;ZHANG Junhong;SONG Qingguo;CUI Jingjing;PENG Saiyang(Schoolof ElectricalEngineering,NavalUniversity o£Engineering,Wuhan 430033,China;Departmentof Early Warning Technology,AirForce Early Warning Academy,Wuhan 430019,China;College of Mechatronics and Automation,Wuchang Shouyi University,Wuhan 430064,China)

机构地区：[1]海军工程大学电气工程学院,武汉430033 [2]空军预警学院预警技术系,武汉430019 [3]武昌首义学院机电与自动化学院,武汉430064

出　　处：《电源学报》2023年第3期1-9,共9页Journal of Power Supply

摘　　要：传统单级Boost型LLC谐振AC/DC变换器因具有转换级数少、功率因数高和软开关等优点而受到广泛研究,但同时它存在直流母线电压太高以及开关器件应力太大等缺点,一般应用于110 V以下的电网中。为克服该问题,提出了一种适用于220 V电网的新型Buck-Boost LLC谐振AC/DC变换器。该变换器除了具有传统结构的特点外,还具备输入电压较高时母线电压不高的优点,采用脉冲频率调制PFM(pulse frequency modulation)方式进行控制。分析了变换器的工作过程,阐述了功率因数校正和软开关的实现机理,给出了变换器主电路关键参数设计方法。最后,搭建了一台170 V~230 V输入、48 V/100 W输出的实验样机,实验结果验证了变换器理论分析的正确性以及该拓扑结构的电网适用性。The traditional single-stage Boost LLC resonant AC/DC converter has been widely concerned because of its advantages such as less conversion stages,a high power factor and soft switching.However,due to its disadvantages such as a high DC bus voltage and a large stress in switching devices,it is generally applied in power grids with voltage below 110 V.To overcome this problem,a novel type of Buck-Boost LLC resonant AC/DC converter for 220 V power grid is proposed,which not only has the characteristics of traditional structures,but also has the advantage of adjustable bus voltage in the case of a high input voltage.The working process of the converter controlled by pulse frequency modulation(PFM)is analyzed,the realization mechanism of power factor correction and soft switching are elaborated upon,and a design method for the key parameters of its main circuit is also given.Finally,an experimental prototype with 170-230 V input and 48 V/100 W output was built,and experimental results verified the theoretical analysis and the grid applicability of the proposed topology.

关 键 词：单级 功率因数校正 低母线电压 BUCK-BOOST LLC谐振 

分 类 号：TM46[电气工程—电器]