摘要
针对宽输出电压应用场合,传统频率控制的LLC谐振变换器在宽频率调节范围下,可实现软开关特性的频率范围窄且传导损耗大。针对该问题,提出一种具有宽输出电压范围混合双全桥LLC谐振变换器。该变换器采用定频双移相控制策略,其开关频率等于谐振频率。通过调节混合双全桥的移相角θ,可实现电压增益0~2的宽范围调节。与采用频率控制的LLC谐振变换器相比,缩小了开关频率变化范围,降低了循环电流及环流损耗,在增益调节范围内具有良好的软开关特性。此外,该变换器的电压增益特性不受谐振参数影响,可简化系统参数设计。最后,搭建了1kW实验样机,验证了本方案的有效性。
For wide output voltage applications,the traditional frequency controlled LLC resonant converter achieves a narrow frequency range with soft switching characteristics under a wide frequency adjustment range,and large conduction losses.To solve this problem,a hybrid double full bridge LLC resonant converter with wide output voltage range is proposed in this paper.The converter adopts fixed frequency double phase shifting control strategy,and its switching frequency is equal to the resonant frequency.By adjusting the phase shift angleθof the hybrid double full bridge,a wide range of voltage gain 0~2 can be obtained.Compared with the LLC resonant converter with frequency control,this scheme narrows the range of switching frequency,reduces circulating current and circulating current loss,and has good soft switching characteristics within the gain adjustment range.In addition,the voltage gain characteristics of the converter are not affected by resonance parameters,which can simplify the system parameter design.Finally,builds a 1kW experimental prototype,and verifies the effectiveness of this scheme.
作者
潘健
石迪
刘雨晴
PAN Jian;SHI Di;LIU Yuqing(Hubei Key Laboratory for High Efficiency Utilization of Solar Energy and Operation Control of Energy Storage,School of Electrical and Electronic Engineering,Hubei Univ.of Tech.,Wuhan 430068,China)
出处
《湖北工业大学学报》
2022年第2期20-24,共5页
Journal of Hubei University of Technology
基金
太阳能发电及储能运行控制湖北省重点实验室开放基金(HBSEES201902)。
关键词
混合双全桥
双移相控制
宽电压
软开关
hybrid double full bridge
dual phase shift control
wide voltage
soft switching
