一种基于辅助网络的软开关二次型Boost高增益变换器

在基于减少冗余功率(R~2P~2)原理的二次型Boost变换器基础上,通过引入辅助网络单元,提出一种基于辅助网络的软开关二次型Boost高增益变换器。该变换器在减少功率传输损耗的同时,实现了全部开关管的零电压导通(ZVS)和输出二极管的零电流关断(ZCS),降低了开关器件的开关损耗。辅助网络与二次型Boost变换器输出串联,提高了变换器电压增益,减小了开关管电压应力。因此,可选取低电压等级、低导通电阻的MOSFET管,进一步提高变换器的效率,降低成本。研究变换器的工作原理和工作特性,分析开关管ZVS条件和占空比丢失问题,设计了一台100W的实验样机,实验结果验证了理论分析的正确性。

A Soft-Switched High Step-Up Quadratic Boost Converter with Auxiliary Circuit

By adding an auxiliary circuit to the novel quadratic Boost converter based on the reduced redundant power processing (R2P2) principle, a soft-switched high step-up quadratic Boost converter with auxiliary circuit is proposed in this paper. This converter can not only reduce the overall power loss but also achieve zero-voltage-switched (ZVS) turn-on of active switches and zero-current-switched (ZCS) turn-off of output diodes, reducing switching loss. Owing to the output-series of the auxiliary circuit and the novel quadratic converter, the proposed converter can achieve high voltage gain and low switch stress. Thus, a low-voltage-rated MOSFET can be utilized to improve the efficiency and reduce the cost. The operating characteristics of steady-state, requirement of the ZVS and the duty ratio loss of the proposed converter are analyzed in detail. Experimental results of a 100W prototype are presented to verify the analysis of the proposed converter.