摘要
隔离Boost变换器起动期间,由于低输出电压导致过冲电流,对变换器造成损坏。提出一种新的隔离Boost变换器软起动控制策略,研究双闭环控制下具有起动电路隔离Boost变换器的起动过程。在提出的控制策略作用下,具有起动电路的隔离Boost变换器起动过程分为Flyback、Hybrid、Boost工作3个工作阶段。详细讨论该起动控制方法及其各个阶段的特点。在峰值电流控制方法下,输出电压在Flyback工作阶段从零开始建立。引入Hybrid工作阶段,同时实现了占空比平滑变化和输出电压平滑建立,该控制策略有效地抑制了起动电流过冲。实验结果验证了理论分析的正确性。
The low output voltage causes a large surge of input current when the isolated Boost converter starts up,thus damaging the converter.This paper proposed a novel start-up scheme of the isolated Boost converter and studied the start-up process of the isolated Boost converter with an auxiliary start-up circuit under voltage and current close-loop control.In the scheme,the start-up process is divided into three stages：Flyback mode,Hybrid mode and Boost mode.This paper introduced the control scheme in detail and discussed the characteristics of three stages.Flyback mode is employed to establish output voltage under the control of peak current mode.Both the duty circle and output voltage are allowed a smooth transition between Flyback and Boost modes,because Hybrid mode was introduced in the control scheme.As a result,inrush current is effectively suppressed.The experimental results verify the correctness of theoretic analysis.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第24期15-20,共6页
Proceedings of the CSEE
