L-R复合调制T型半桥LCC谐振变换器  

T-Type Half-Bridge LCC Resonant Converter with L-R Composite Modulation

作　　者：袁义生 易尘宇 彭能 Yuan Yisheng;Yi Chenyu;Peng Neng(School of Electrical and Automation Engineering East China Jiaotong University,Nanchang 330013 China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《电工技术学报》2022年第4期892-904,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52067007)。

摘　　要：针对宽输出电压范围应用场合下,传统LCC谐振变换器变频调制调频范围宽,而采用定频调制时有软开关范围窄、轻载环流大的问题,该文基于半桥LCC谐振变换器提出一种线性-谐振(L-R)复合调制的T型半桥LCC谐振变换器。所提变换器通过添加一组Boost桥臂,在传统谐振模态中加入Boost储能模态,使得谐振电流在一个周期内呈线性、谐振型两个状态的变化,提高了传统谐振模式下的电压增益,且具有全负载范围无环流、软开关的特点。所提变换器采用脉冲频率调制-脉冲宽度调制(PFM-PWM)复合调制方式,具有谐振-线性回馈(R-LF)、线性升压-谐振(LB-R)两种工作模式,在较小的频率范围内能够实现宽范围输出,在轻载下能够保持定频PWM,提高了轻载效率。该文详细介绍了变换器的工作原理,根据时域关系推导电压增益的表达式,最后基于恒流恒压(CC-CV)充电给出设计步骤,搭建一台实验样机,实验结果验证了理论分析的正确性。In the applications of wide output voltage range,the LCC resonant converter with frequency modulation has the disadvantage of wide switching frequency range,while the fixed frequency modulation has the disadvantage of narrow soft-switching range.In this paper,a T-type half-bridge LCC resonant converter with linear-resonance(L-R)composite modulation is proposed.The energy storage stage is added to the traditional resonant mode,which makes the resonant current show linear and resonant changes in one cycle.It can improve the voltage gain,and has the characteristics of soft switching and no circulating current in the full load range.The proposed converter operates in resonant-linear feedback(R-LF)and linear boost-resonant(LB-R)modes by adopting PFM-PWM composite modulation,and can achieve wide voltage gain range with narrow switching frequency.The switching frequency is fixed in the light load condition,which improves light load efficiency.In this paper,the operating principle was introduced in detail,and the expression of voltage gain was derived.The design steps based on constant current and constant voltage charging were given.Finally,an experimental prototype was built,and the results proved the correctness of the theoretical analysis.

关 键 词：变换器 LCC谐振 宽范围输出 CC-CV充电 

分 类 号：TM46[电气工程—电器]