一种新型非谐振型软开关交错并联Boost电路

提出一种新型非谐振型交错并联Boost零电压转换(ZVT)电路。在传统交错并联Boost拓扑基础上添加了一组由一个电感、两个电容、一个开关管、四个二极管组成的辅助网络,令主开关管实现了零电压开通与关断,辅助开关管实现了零电流开通与部分零电压关断,降低了开关损耗,提升了电路变换效率。软开关可在宽工作范围内有效实现,电路工作在连续电流模式(CCM),控制方式简明易行,辅助网络的引入没有给主开关管带来额外电流应力。通过复用部分辅助元件,提高了辅助网络利用率,减少了体积与费用;降低了开关过程中的dv/dt、di/dt,抑制了开关噪声。详细分析了电路拓扑结构、工作原理,并对主要参数进行了优化选取,最后通过实验验证了理论分析的正确性。

A Novel Interleaved Boost Converter with Non-Resonant Soft-Switching

A novel interleaved Boost converter with non-resonant zero-voltage-transition (ZVT) is proposed in this paper.Based on the conventional interleaved Boost converter,an auxiliary circuit composed of 1 inductor,2 capacitors,1 active power switch and 4 diodes is added.Main switches turn ON and OFF with ZVT,while auxiliary switch turns ON with zero-current-transition (ZCT) and OFF partly with ZVT,so as to reduce the switching losses and raise conversion efficiency.Soft-switching in wide operation range can be guaranteed,so can the simple control method.The converter can work in continuous current mode (CCM),and no extra current stress is added to the main switches.With sharing some auxiliary devices,the utilization of auxiliary circuit is improved,thus the size and cost are reduced.In addition,dv/dt and di/dt are also reduced,and switching noises are suppressed.The circuit configuration and operation principle are presented.Major parameters of auxiliary circuit are optimized.Experimental results are also given to verify the theoretical analysis.