耦合电感式新型交错Boost软开关变换器研究

提出一种新型的耦合电感式交错并联Boost软开关变换器的拓扑结构,并对相应控制方法及耦合电感耦合系数进行设计。该变换器利用耦合电感漏感与开关管输出电容之间的谐振,令开关管在占空比大于0.5时实现零电压开通,在占空比小于0.5时实现近似零电流开通,降低了开关损耗;而且没有添加额外器件,不会对变换器功率密度造成影响。详细给出了电路拓扑结构、工作原理及工作过程分析,对表征电路能量传递的有效占空比进行了讨论,对影响软开关效果的耦合电感耦合系数进行了分析与设计,最后在SIMetrix环境下进行仿真,并搭建了250 W原理样机,仿真与试验结果验证了理论分析的正确性。

Research on novel soft-switched interleaved Boost converter with coupled inductor

This paper proposes a novel soft-switched interleaved Boost converter with coupled inductors,as well as control methods in different operations and detail design of coupling coefficient. By the resonance between leakage inductance of coupled inductors and output capacitance of switches,the zero voltage turn-on（ when the duty cycle is larger than 0. 5） and approximate zero current turn-on（ when the duty cycle is less than 0. 5） of switches can be achieved,which is good for switching loss decrease. Furthermore,the power density will not be impacted negatively because of no extra devices. The circuit configuration,operating principle and operation analysis are presented.The efficient duty cycle and coupling coefficient of the coupled inductors are analyzed and designed. Finally,a simulation is carried out with SIMetrix,while a prototype rated at 250 W is established in the lab,and the simulation and experimental results verify the theory analysis.