Asymmetrical $Gamma$-Source Inverters
Asymmetrical $Gamma$-Source Inverters
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非对称$Gamma$源逆变器
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
F. Blaabjerg
中科院分区：
文献类型：
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作者：
W. Mo;P. Loh;F. Blaabjerg
阻抗源逆变器是一种具有传统逆变器无法实现的降压升压功能的逆变器。它们的升压能力是通过在不造成损坏的情况下缩短它们的相腿来引入的。因此，阻抗源逆变器不太容易发生由电磁干扰引起的错误触发。然而，目前的阻抗源逆变器的负担，其低调制比在高输入输出增益。这种低调制通常会导致元件上的高电压应力以及逆变器输出端的低频谱性能。为了避免这些问题，已经引入了具有耦合变压器的逆变器，但是它们通常导致高匝数比，因此在高增益下导致许多绕组匝数。另一种方法是本文提出的不对称Γ源逆变器，其增益通过将匝数比降低到1来提高。所提出的逆变器的输入电流是平滑的，因此，更适应的来源。理论和实验结果表明，本文提出的概念进行验证。
Impedance-source inverters are inverters with voltage-buck-boost capability that cannot be achieved by the traditional inverters. Their boost capability is introduced by shorting their phase legs without causing damages. Impedance-source inverters are therefore less prone to false triggering caused by electromagnetic interference. Present impedance-source inverters are, however, burdened by their low modulation ratio at high input-to-output gain. Such low modulation usually leads to high-voltage stresses across the components and poor spectral performance at the inverter output. To avoid these problems, inverters with coupled transformers have been introduced, but they usually lead to high turns ratio, and hence many winding turns, at high gain. An alternative would then be the asymmetrical Γ-source inverters proposed in this paper, whose gain is raised by lowering their turns ratio toward unity. The input current drawn by the proposed inverters is smoother and, hence, more adaptable by the source. Theories and experimental results have been presented in this paper for validating the concepts proposed.