A 1-MHz Series Resonant DC-DC Converter With a Dual-Mode Rectifier for PV Microinverters

The photovoltaic (PV) output voltage varies over a wide range depending on operating conditions. Thus, the PV-connected converters should be capable of handling a wide input voltage range while maintaining high efficiencies. This paper proposes a new series resonant dc-dc converter for PV microinver...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-07, Vol.34 (7), p.6544-6564
Main Authors: Shen, Yanfeng, Wang, Huai, Shen, Zhan, Yang, Yongheng, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
1-MHz frequency
Converters
DC-DC power converters
dc–dc converter
Design optimization
Diodes
Electric potential
Inverters
Phase modulation
photovoltaic (PV) microinverter
Photovoltaic cells
Power loss
Rectifiers
Resonant converters
series resonant converter (SRC)
Solar cells
Switches
Switching
Topology
Voltage control
Voltage gain
wide input voltage range
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Summary:The photovoltaic (PV) output voltage varies over a wide range depending on operating conditions. Thus, the PV-connected converters should be capable of handling a wide input voltage range while maintaining high efficiencies. This paper proposes a new series resonant dc-dc converter for PV microinverter applications. Compared with the conventional series resonant converter, a dual-mode rectifier is configured on the secondary side, which enables a twofold voltage gain range for the proposed converter with a fixed-frequency phase-shift modulation scheme. The zero-voltage switching turn- on and zero-current switching turn- off can be achieved for active switches and diodes, thereby, minimizing the switching losses. Moreover, a variable dc-link voltage control scheme is introduced to the proposed converter, leading to a further efficiency improvement and input-voltage-range extension. The operation principle and essential characteristics (e.g., voltage gain, soft-switching, and root-mean-square current) of the proposed converter are detailed in this paper, and the power loss modeling and design optimization of components are also presented. A 1-MHz 250-W converter prototype with an input voltage range of 17-43 V is built and tested to verify the feasibility of the proposed converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2018.2876346