Variable on-Time Control Scheme for the Secondary-Side Controlled Flyback Converter
Variable on-Time Control Scheme for the Secondary-Side Controlled Flyback Converter
复制标题
次级侧控制反激式转换器的可变导通时间控制方案
DOI：
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复制
发表时间：
2019
影响因子：
6.7
通讯作者：
A. Muetze
中科院分区：
文献类型：
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作者：
A. Connaughton;A. P. Talei;K. Leong;K. Krischan;A. Muetze
本文提出了一种新的控制方法的次级侧控制的反激概念，沿着与改进的漏源极电压检测更精确的栅极信号和减少的损失进行了分析。与此概念的现有控制方案相比，本文提出的方法在整个负载范围内保持恒定的开关频率，而无需任何额外的硬件，从而提高效率并简化耦合电感器的设计优化。一个65 W的演示显示最小的输出涟漪在负载变化，峰值效率为89.90%，自然的输出电流限制在过载条件下，并利用一种新型的无损同步整流传感支路，最小的零电流交叉延迟。
This paper presents an analysis of a novel control approach for the secondary side controlled flyback concept, along with improved drain–source voltage sensing for more precise gate signals and reduced losses. In contrast to the existing control scheme for this concept, the approach presented here sustains constant switching frequency throughout the load range without any additional hardware, boosting efficiency and simplifying coupled inductor design optimization. A 65-W demonstrator shows minimal output ripple during load changes, peak efficiency of 89.90%, natural output current limiting in overload conditions, and utilizes a novel lossless synchronous-rectification sensing subcircuit with minimal zero current crossing delay.