单端正激变换器谐振复位条件分析

N. Murakami, M. Yamasaki
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引用次数: 47

摘要

分析了工作在谐振复位模式下的单端正激变换器铁心磁通的复位情况。推导了复位时间与器件参数(如主开关输出电容)之间的关系。因此,可以预测谐振复位模式下的最大频率。主要结果是:主变压器反激电压的谐振周期主要由变压器磁化电感、主开关输出电容和二极管结电容决定;在B-H特性中,主变压器磁通偏移在第一象限和第三象限之间;谐振复位模式下的最大工作频率由上述参数和主开关导通时的伏秒积决定。通过与输入电压为50v,最大输出电压为5v, 2a的小功率dc - dc变换器的实验结果对比,验证了分析的有效性
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of a resonant reset condition for a single-ended forward converter
The reset condition of a transformer core flux is analyzed for a single-ended forward converter operating in a resonant reset mode. Relationships between reset time and device parameters such as the main switch output capacitance are derived. As a result, the maximum frequency in a resonant reset mode can be predicted. The main results are: the resonance period of the main transformer flyback voltage is mainly determined by transformer magnetizing inductance, main switch output capacitance, and diode junction capacitance; the main transformer flux excursion is between the first and third quadrant in B-H characteristics; and the maximum operating frequency in the resonant reset mode is determined by the above parameters and volt-second products during main switch on-time. The validity of the analysis is confirmed by comparison with experimental results for a low-power DC-to-DC converter with a 50 V input and a 5 V, 2 A maximum output.<>
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