A three-winding coupled inductor, arranged as a Y-source network, has been used for voltage boosting with a standard inverter bridge and no other active switches. However, its maximum modulation and boost duty ratios are correlated with an increase of one maximum necessitating the reduction of the other. Its voltage quality and dc-bus utilization will hence deteriorate greatly at high gain. Moreover, in the presence of nonnegligible leakage, the Y-source network experiences large voltage spikes caused by unintentionally abrupt inductive current changes. Its coupling coefficient must hence be very close to unity or a snubber and always be added. To overcome these limitations, a split-Y-source inverter has been proposed, whose maximum modulation and boost duty ratios can be increased simultaneously, while using only a single-inverter bridge. It is also not burdened by inrush currents and voltage spikes and hence does not impose strict requirements on coupling and snubber. These advantages are in addition to the increased freedom of tuning two turns ratios to keep the total number of turns small, while retaining a high-voltage boost. Theoretical analyses, simulations, and experimental results have successfully verified the performance of the proposed inverter.

中文翻译：

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无漏感电压尖峰的磁耦合高压升压分离式 Y 源逆变器

一个三绕组耦合电感器，排列成一个 Y 源网络，已被用于升压，带有一个标准逆变桥，没有其他有源开关。然而，它的最大调制和升压占空比与一个最大值的增加相关，需要减少另一个。其电压质量和直流总线利用率将因此在高增益下大大恶化。此外，在存在不可忽略的泄漏的情况下，Y 源网络会经历由无意中突然感应电流变化引起的大电压尖峰。因此，它的耦合系数必须非常接近于 1 或缓冲器，并且始终相加。为了克服这些限制，已经提出了一种分离 Y 源逆变器，其最大调制和升压占空比可以同时增加，同时只使用一个单逆变器桥。它也不受浪涌电流和电压尖峰的影响，因此对耦合和缓冲器没有严格要求。除了这些优势之外，还增加了调整两个匝数比以保持总匝数较小，同时保持高压升压的自由度。理论分析、模拟和实验结果已成功验证了所提出逆变器的性能。