Abstract
Variable frequency and phase shift modulation can achieve zero-voltage switching (ZVS) of dual active bridge series resonant DC-DC converters(DABSRCs) over a wide operating range so as to effectively improving system efficiency and reliability. In order to study the dynamics of DABSRCs and provide the basis for the closed-loop compensator design, a continuous-time small-signal model is proposed. The generalized average modelling approach is adopted, in which the DC component of the output voltage and the fundamental component of the inductor current and resonant capacitor voltage are selected as the state variables, precisely describing impacts of the resonance on the system dynamics. On the above-mentioned basis, a closed-loop compensator is designed, which achieves the stable operation with the ZVS variable frequency and phase shift modulation. The analysis results are verified by the simulation and experimental results.
Highlights
图 1 非隔离半桥 DABSRC 及 ZVS 变频 + 移相控制框图
In order to study the dynamics of DABSRCs and provide the basis for the closed⁃loop compensator design, a continuous⁃time small⁃signal model is proposed
The generalized average modelling approach is adopted, in which the DC component of the output voltage and the fundamental component of the inductor current and resonant capacitor voltage are selected as the state variables, precisely describing impacts of the resonance on the system dynamics
Summary
图 1 非隔离半桥 DABSRC 及 ZVS 变频 + 移相控制框图 设计的重要依据。 本文以输出电压闭环控制为例, 建立 ZVS 变频+移相控制的 DABSRC 小信号模型。 式中, Rpar 表示 LC 谐振电路和开关管导通电阻的集 中等效电阻。 s1(t) 和 s2(t) 分别为原、副边半桥电 路的开关函数,根据图 2,其表达式为 对于给定的稳态控制变量 ωs = Ωs,φ = Φ, DABSRC 的稳态工作点 X = [ IL1R ,IL1I ,VC1R ,VC1I ,Vo ] T 可以从方程 AX + B = 0 得出。
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
