Conditions Limiting the Formation of the ZVZCT Switching in SAZZ Converter
Conditions Limiting the Formation of the ZVZCT Switching in SAZZ Converter
复制标题
SAZZ变换器中ZVZCT开关形成的限制条件
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Kawamura
中科院分区：
文献类型：
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作者：
Y. Tsuruta;M. Pavlovsky;A. Kawamura
本文报道了SAZZ变换器拓扑结构中软开关条件的形成。缩写SAZZ表示缓冲器辅助零电压零电流转换变换器。在[2,3,4,5]中报道了100 kHz和50 kHz转换器的高效率，输出功率分别为8 kW和25 kW。然而，极端的占空比变化会导致软开关的损耗。对于SAZZ斩波电路的升压工作，当输出与输入电压比减小到2以下时，出现部分硬开关。同样地，对于降压操作，当输出与输入电压比降到1/2以下时，出现部分硬开关。本文对SAZZ软开关范围进行了理论分析和仿真研究。该分析得到了100khz - 8kw SAZZ变换器样机实验的支持。
The paper reports on formation of soft switching conditions in SAZZ converter topology. Abbreviation SAZZ represents snubber assisted zero voltage and zero current transition converter. In [2,3,4,5] high efficiency around 98% was reported for 100 kHz and 50 kHz converter with output power of 8 kW and 25 kW respectively. However, extreme changes of duty ratio could result in loss of soft switching. For the boost operation of SAZZ chopper circuit, when the output to input voltage ratio decreases below 2, the partial hard switching appears. Similarly for the buck operation, when the output to input voltage ratio decreases below 1/2, the partial hard switching appears. The theoretical analysis and simulation studies of SAZZ soft switching range are presented in this paper. The analysis is supported by experiments on 100 kHz- 8 kW SAZZ converter prototype.