Journal
IET POWER ELECTRONICS
Volume 12, Issue 4, Pages 719-728Publisher
WILEY
DOI: 10.1049/iet-pel.2018.5901
Keywords
inductors; magnetic cores; invertors; coupled inductor; unintentional dc-link voltage spikes; gain reduction; quasiY-source inverter; leakage effects; continuous input current; suppressed inrush; controllable duty ratio; leakage inductances; magnetic core
Categories
Funding
- National Key R&D Program of China [2016YFE0102800]
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The Y-source inverter uses different turns ratios of a coupled inductor and a controllable duty ratio to vary its gain. However, its input current is discontinuous, and any leakage inductances of its coupled inductor will lead to unintentional dc-link voltage spikes and gain reduction. To solve these problems, an extended quasi-Y-source inverter has been proposed in this study, which compared with the Y-source inverter, uses an extra inductor and an extra capacitor. Although the extras may not appear attractive, they have successfully helped with the suppression of leakage effects, which decrease the voltage spikes, and hence permit the main magnetic core size to be much smaller. Concurrently, the continuous input current can be also achieved. Besides, inrush current at startup has been reduced to a more acceptable value, which together with other features of the proposed inverter, have been proven through experiments.
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