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DC converter with three circuit cells - analysis, design and experimental evaluation

机译：具有三个电路单元的直流转换器-分析，设计和实验评估

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摘要

A new DC/DC converter with three circuit cells has been presented. For high input voltage applications, two-input split capacitors with four active switches are used in the proposed converter to limit the voltage stress of each power switch at one-half of input voltage. Thus, power metal-oxide semiconductor field-effect transistors (MOSFETs) with 500 V voltage rating can be adopted for 1000 V input voltage applications. Two balance capacitors are adopted in the proposed circuit to automatically balance two split input capacitor voltages in each switching cycle. Three resonant tanks are used at primary side of the proposed converter to share the load current and reduce the current stress of passive components. Thus, the sizes of the magnetic core and bobbin are reduced. If the operating switching frequency is less than the series resonant frequency, power MOSFETs are turned on at zero-voltage switching and rectifier diodes can be turned off at zero current switching. Thus, the switching losses on power semiconductors are reduced. Finally, experiments with a 1.5 kW prototype are provided to verify the effectiveness of the proposed converter.
机译：提出了一种具有三个电路单元的新型DC / DC转换器。对于高输入电压应用，建议的转换器中使用带有四个有源开关的两输入分流电容器，以将每个电源开关的电压应力限制在输入电压的一半。因此，额定电压为500 V的功率金属氧化物半导体场效应晶体管（MOSFET）可以用于1000 V输入电压应用。在建议的电路中采用了两个平衡电容器，以在每个开关周期中自动平衡两个分离的输入电容器电压。在建议的转换器的初级侧使用三个谐振回路，以共享负载电流并降低无源元件的电流应力。因此，减小了磁芯和线轴的尺寸。如果工作开关频率小于串联谐振频率，则功率MOSFET在零电压开关时导通，而整流二极管可以在零电流开关时关断。因此，减小了功率半导体上的开关损耗。最后，提供了一个1.5 kW原型的实验，以验证所提出的转换器的有效性。

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