用于含谐振零点的多谐振元件软开关直流变换器参数设计

A Parameter Design Method for the Multi-Element Soft-Switching DC-DC Converter with a Resonant Zero Point

提出了一种适用于含有谐振零点的多谐振元件软开关直流变换器的参数设计方法,结合Matlab程序、导通损耗和关断损耗分析、三维图形筛选以及设置谐振特征变量优先级折中等多种方法帮助变换器实现了低开关损耗、宽输出电压范围、具有过电流保护能力等多种有益效果。以一种含有谐振零点的CLTCL直流变换器为例,详细给出了具体的设计过程,并基于一台额定功率1 k W的样机对参数设计结果进行了实验验证。实验结果表明,在设计参数下,样机的最高变换效率高达97.2%且输出电压范围极宽,从额定52 V至零可调,符合参数设计要求。变换器直流电压增益曲线的计算、仿真、实验结果对应良好,证明了所述参数设计方法的有效性。

This paper proposes a parameter design method for the multi-element soft-switching DC-DC converter with a resonant zero point.Combining with the Matlab program,comprehensive analysis of the conduction loss and turn-off loss,3D figure selection and compromise of the preset priorities of the resonant characteristic variables,this method assists the converter to harvest fruitful outcomes,including low switching losses,wide output voltage range and the capacity of over-current protection.Then taking a CLTCL converter with a resonant zero point for instance,this paper presents the specific design procedure in detail and conducts experiments on a rated 1 kW prototype to test the parameter design.The experimental results show that with the parameters selected,the peak efficiency of the converter reaches as high as 97.2%and the broadened output voltage range is adjustable from the rated 52 V to zero,both of which meet the parameter design requirements.Moreover,the consistency of the calculation,simulation and experiment for the converter’s DC voltage gain curves also verifies the validity of the proposed parameter design method.