基于脉冲源单元的单一次绕组隔离型多输入变换器

Isolated Multiple-Input Converters With Single Primary Winding Based on Pulsating Source Cell

随着新能源的开发和利用,多输入直流变换器(MIC)以其电路结构简单、元器件数量少而越来越受到关注。在分析单输入与多输入变换器基本结构的基础上,本文将脉冲电压源或脉冲电流源进行串并联组合,并直接替代单输入隔离型变换器的直流输入源,进而推导出一族单一次绕组MIC电路拓扑。该MIC的变压器只有一个一次绕组,因此结构简单,容易设计和制造。同时,在该类MIC中,开关器件电压应力低,各输入源可同时或分时向负载提供能量。本文详细阐述单一次绕组MIC的拓扑生成方法、控制方式和特点,并以单一次绕组双输入Flyback变换器为例,分析其工作原理和控制策略,最后通过原理样机进行实验验证。

Environment concern is now the driving force for using renewable energy.The multiple-input DC/DC converters（MICs） have attracted more attention for its simpler structure and less devices and components.Based on the analysis of the configuration of single-input converter（SIC） and MIC,this paper combines of the pulsating voltage source cell and pulsating current source cell in series or in parallel to replace the single input of SIC directly.Then a family of isolated MICs with single primary winding is derived.The derived isolated MICs can power the load separately or simultaneously.The number of the devices and passive components are reduced and construction becomes simpler.The control of the MICs is flexible and the voltage stress of the devices is low.This paper explains the derive method and control methods of the MICs and its characters in detail.Finally,a double-input flyback converter with the single primary winding is taken as an example.Its operation principle and control strategy are discussed.A prototype is built to demonstrate the benefits of this topology.