可拓展的宽输出变模态交错并联LLC变换器  

Expandable Wide-output Variable-mode Interleaved Parallel LLC Converter

作　　者：张杰[1,2] 杨淋 邹晨 肖辞 刘林[1] ZHANG Jie;YANG Lin;ZOU Chen;XIAO Ci;LIU Lin(Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Hubei University of Technology,Wuhan 430068,China;Xiangyang Industrial Institute of Hubei University of Technology,Xiangyang 441100,China)

机构地区：[1]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉430068 [2]襄阳湖北工业大学产业研究院,襄阳441100

出　　处：《电源学报》2025年第2期1-10,共10页Journal of Power Supply

基　　金：2020年湖北省重点研发计划资助项目(2020BBB084)。

摘　　要：为了解决频率控制的LLC谐振变换器受限于开关频率而难以实现宽输出电压范围这一问题,研究了1种可拓展的变模态交错并联LLC谐振变换器。该变换器的二次侧采用倍压整流电路,根据一次侧双半桥不同的开关组合工作在并联模态或串联模态,可以适应1~3N倍宽输出电压范围。同时,提出了1种定频PWM控制方法,通过在并联模态和串联模态的中间区域固定开关频率为谐振频率,改变1个桥臂的占空比,实现电压控制。PSIM仿真结果验证了该变换器经过拓展2N个谐振腔后可实现1~3N倍宽输出电压范围。100W实验样机的实验结果验证了双半桥两谐振腔时可实现1~3倍的宽输出电压范围,证明了该变换器及其控制策略的有效性。Limited by the switching frequency,the frequency-controlled LLC resonant converter is difficult to achieve a wide output voltage range.To solve this problem,an expandable variable-mode interleaved parallel LLC resonant converter is studied.The secondary-side of this converter adopts a voltage doubling rectifier circuit,which can work in a parallel or series mode according to different switch combinations of two half-bridges on the primary-side,and it can adapt to the wide output voltage range of 1–3N times.A fixed-frequency PWM control method is proposed.In the middle region between the parallel and series modes,the fixed switching frequency is taken as the resonant frequency,and the duty cycle of one bridge arm is changed to realize voltage control.PSIM simulation results show that the wide output voltage range of 1–3N times can be realized by expanding 2N resonator cavities.The experimental results of a 100 W prototype demonstrate that the wide output voltage range of 1–3 times can be achieved with two half-bridges and two resonant cavities,and the effectiveness of the proposed converter and its control strategy was verified.

关 键 词：谐振变换器 宽电压输出 定频PWM控制 

分 类 号：TM46[电气工程—电器]