A High-Efficiency MOSFET Transformerless Inverter for Nonisolated Microinverter Applications
A High-Efficiency MOSFET Transformerless Inverter for Nonisolated Microinverter Applications
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DOI：
10.1109/tpel.2014.2339320
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
Baifeng Chen;Bin Gu;Lanhua Zhang;Zaka Ullah Zahid;J. Lai;Zhiling Liao;Ruixiang Hao
中科院分区：
文献类型：
--
作者：
Baifeng Chen;Bin Gu;Lanhua Zhang;Zaka Ullah Zahid;J. Lai;Zhiling Liao;Ruixiang Hao
最先进的低功率级金属氧化物半导体场效应晶体管(MOSFET)无变压器光伏逆变器可以通过使用最新的超结MOSFET来实现高效率。然而，这些基于MOSFET的逆变器拓扑存在以下一个或多个缺点：体二极管反向恢复带来的MOSFET故障风险、更多器件导致的导通损耗增加，或者磁体利用率低。通过将传统的基于MOSFET的相桥臂与优化电感分开，提出了一种新的基于MOSFET的相桥臂结构，以最大限度地减少这些缺点。基于提出的相桥结构，提出了一种适用于光伏微逆变器的高效单相MOSFET无变压器逆变器。然后介绍了脉宽调制(PWM)调制和电路工作原理。在此基础上，建立了电路的共模和差模电压模型，并对其进行了分析。250W硬件样机的实验结果证明了该无变压器逆变器在非隔离两级光伏微逆变器应用中的优点。
State-of-the-art low-power-level metal-oxide-semiconductor field-effect transistor (MOSFET)-based transformerless photovoltaic (PV) inverters can achieve high efficiency by using latest super junction MOSFETs. However, these MOSFET-based inverter topologies suffer from one or more of these drawbacks: MOSFET failure risk from body diode reverse recovery, increased conduction losses due to more devices, or low magnetics utilization. By splitting the conventional MOSFET-based phase leg with an optimized inductor, this paper proposes a novel MOSFET-based phase leg configuration to minimize these drawbacks. Based on the proposed phase leg configuration, a high efficiency single-phase MOSFET transformerless inverter is presented for the PV microinverter applications. The pulsewidth modulation (PWM) modulation and circuit operation principle are then described. The common-mode and differential-mode voltage model is then presented and analyzed for circuit design. Experimental results of a 250 W hardware prototype are shown to demonstrate the merits of the proposed transformerless inverter on nonisolated two-stage PV microinverter application.