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首页> 外文会议>12th Brazilian Power Electronics Conference >DC-DC nonisolated boost converter with high voltage gain adequate for split-capacitor inverter applications
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DC-DC nonisolated boost converter with high voltage gain adequate for split-capacitor inverter applications

机译：DC-DC非隔离式升压转换器，具有高电压增益，适用于分电容逆变器应用

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摘要

This paper presents a dc-dc boost converter with high voltage gain based on three-state switching cell for split-capacitor neutral-point clamped inverters. The proposed converter is analyzed considering the operation in continuous conduction mode and duty cycle higher than 0.5, which corresponds to overlapping mode. The main characteristics of the topology are: operation at high switching frequency, while the input inductor is designed for twice such frequency; in order to minimize weight and volume, the voltage stress across the switches is lower than half of the output voltage and naturally clamped by one output capacitor, allowing the use of transistors MOSFETs with reduced intrinsic on-resistance; the input current presents small ripple; the output voltage can be further step up by increasing the transformer turns ratio without compromising the voltage stress across the switches; the output voltage is balanced thus making the converter suitable for supplying split-capacitor inverters. Several topologies where high voltage step up is possible are initially investigated in literature. Then the principle of operation, the design methodology, and experimental results for a 1kW prototype are presented to validate the theoretical analysis and demonstrate the converter performance.
机译：本文提出了一种基于三态开关单元的高电压增益DC-DC升压转换器，用于分离式电容器中性点钳位逆变器。在考虑连续导通模式和占空比大于0.5的占空比（对应于重叠模式）的情况下，对提出的转换器进行了分析。拓扑的主要特征是：在高开关频率下工作，而输入电感器的设计频率是该频率的两倍；为了最小化重量和体积，开关两端的电压应力低于输出电压的一半，并且自然地被一个输出电容器钳位，从而允许使用固有导通电阻降低的晶体管MOSFET；输入电流呈现小纹波；通过增加变压器的匝数比，可以进一步提高输出电压，而不会影响开关两端的电压应力。输出电压是平衡的，因此使得该转换器适合为分体式电容器逆变器供电。最初在文献中研究了可能进行高压升压的几种拓扑。然后给出了1kW原型的工作原理，设计方法和实验结果，以验证理论分析并证明转换器性能。

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