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A Dual-Active-Bridge-Based Fully ZVS HF-Isolated Inverter With Low Decoupling Capacitance.
- Source :
- IEEE Transactions on Power Electronics; Mar2020, Vol. 35 Issue 3, p2615-2628, 14p
- Publication Year :
- 2020
-
Abstract
- This paper proposes a novel dual active bridge (DAB)-based high-frequency-isolated dc–ac converter topology suitable for photovoltaic microinverter applications. The circuit configuration on the secondary sides of the employed three-winding transformer results in high-frequency current injection into each of the switch nodes, thereby making zero-voltage-switching (ZVS) operation of the devices possible. The topology achieves this functionality while using the same number of devices as conventional two-stage and single-stage high-frequency-link or DAB-based solutions. Furthermore, following a control-oriented power pulsation decoupling strategy involving dynamic variation of phase shift, twice line-frequency energy buffering can be handled on the high-voltage secondary side, thereby resulting in reduction in decoupling capacitance requirement. The working principle of the circuit and the associated control scheme is described followed by a detailed ZVS analysis. Simulation studies and experimental tests on a 310 W prototype verify circuit operation and exhibit efficiency improvements compared to a similar two-stage solution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 35
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 140827898
- Full Text :
- https://doi.org/10.1109/TPEL.2019.2927596