Analysis and design of a dual-mode flyback converter
Analysis and design of a dual-mode flyback converter
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双模反激式转换器的分析与设计
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Chien
中科院分区：
文献类型：
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作者：
Yu;Jing;Chao;Chien
本文提出了一种在宽负载范围内提高反激变换器效率的双模控制方案。所提出的反激变换器具有新颖的双模工作特性。采用谷开关技术降低轻载时的开关损耗。另一方面，连续导通模式（CCM）操作的固定关断时间（FOT）控制降低了重载时的导通损耗。讨论和分析了所提出的双模控制器的原理和设计步骤。最后，实现了输出电压为19 V的140 w双模反激变换器。实验结果与理论分析一致。
This letter presents a dual-mode control scheme to improve the efficiency of a flyback converter in a wide load range. The proposed flyback converter features a novel dual-mode operation. The valley-switching technique is adopted to reduce the switching loss at light load. On the other hand, the fixed off-time (FOT) control with continuous conduction mode (CCM) operations decrease the conduction losses at heavy load. The principles and design procedures of the proposed dual-mode controller are discussed and analyzed. Finally, a 140-W dual-mode flyback converter with an output voltage of 19 V is implemented. Experimental results agree with the theoretical analysis.