恒频、零电压开关、箝位模式并联谐振变换器

F. Tsai, J. Sabate, F. Lee
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引用次数: 26

摘要

研究了工作在谐振频率以上的恒频箝位并联谐振变换器的直流特性。该转换器显示能够在宽输入范围内从空载到满载的所有开关的零电压导通下工作。确定了各种电路工作模式并定义了其相应的工作区域。推导了变换器设计的直流特性。为了证明恒频零电压开关工作的可行性,并验证了分析结果,对工作频率为104khz的5v 50w变换器原型进行了面包板设计。该变换器在整个输入电压范围内从空载到满负荷进行零电压切换,无需任何外部反平行二极管和缓冲器。实验结果与分析预测吻合较好。效率达到85%。
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Constant-frequency, zero-voltage-switched, clamped-mode parallel-resonant converter
The DC behavior of a constant-frequency, clamped-mode parallel-resonant converter operating above resonant frequency is characterized. The converter is shown to be able to operate with zero-voltage turn-on for all the switches from no load to full load over a wide input range. Various circuit operating modes are identified and their corresponding operating regions defined. DC characteristics for the converter design are derived. A 5 V, 50 W prototype converter operating at 104 kHz is breadboarded to show the feasibility of constant-frequency, zero-voltage-switching operation and to substantiate the analytical results. The converter is operated with zero-voltage switching from no load to full load over the entire input voltage range without any external antiparallel diodes and snubbers. The experimental results are in good agreement with the analytical predictions. An efficiency of 85% is achieved.<>
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