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http://dx.doi.org/10.6113/TKPE.2019.24.6.396

High-Efficiency Dual-Buck Inverter Using Coupled Inductor  

Yang, Min-Kwon (Division of Electronic Engineering, Chonbuk Nat'l University)
Kim, Yu-Jin (Division of Electronic Engineering, Chonbuk Nat'l University)
Cho, Woo-Young (Division of Electronic Engineering, Chonbuk Nat'l University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.24, no.6, 2019 , pp. 396-405 More about this Journal
Abstract
Single-phase full-bridge inverters have shoot-through problems. Dead time is an essential way of solving these issues, but it distorts the output voltage and current. Dual-buck inverters are designed to eliminate the abovementioned problems. However, these inverters result in switching power loss and electromagnetic interference due to the diode reverse-recovery problem. Previous studies have suggested reducing the switching power loss from diode reverse-recovery, but their proposed methods have complex circuit configurations and high system costs. To alleviate the switching power loss from diode reverse-recovery, the current work proposes a dual-buck inverter with a coupled inductor. In the structure of the proposed inverter, the current flowing into the original diode is divided into a new diode. Therefore, the switching power loss is reduced, and the efficiency of the proposed inverter is improved. Simulation waveforms and experimental results for a 1.0 kW prototype inverter are discussed to verify the performance of the proposed inverter.
Keywords
Single-phase; Dual-buck inverter; Reverse-recovery problem; Power efficiency;
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