A High-Efficiency MOSFET Transformerless Inverter for Nonisolated Microinverter Applications

State-of-the-art low-power-level metal-oxide-semiconductor field-effect transistor (MOSFET)-based transformerless photovoltaic (PV) inverters can achieve high efficiency by using latest super junction MOSFETs. However, these MOSFET-based inverter topologies suffer from one or more of these drawbacks...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-07, Vol.30 (7), p.3610-3622
Main Authors: Baifeng Chen, Bin Gu, Lanhua Zhang, Zahid, Zaka Ullah, Lai, Jih-Sheng Jason, Zhiling Liao, Ruixiang Hao
Format: Article
Language:English
Subjects:
Circuits
CMOS
Electronics
Energy efficiency
Inductors
Inverters
Magnetics
Microinverter
MOSFET
MOSFET inverters
photovoltaic (PV) inverter
Photovoltaic cells
Power transformer insulation
Prototypes
Pulse width modulation
Topology
transformerless inverter
Transistors
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Description
Summary:State-of-the-art low-power-level metal-oxide-semiconductor field-effect transistor (MOSFET)-based transformerless photovoltaic (PV) inverters can achieve high efficiency by using latest super junction MOSFETs. However, these MOSFET-based inverter topologies suffer from one or more of these drawbacks: MOSFET failure risk from body diode reverse recovery, increased conduction losses due to more devices, or low magnetics utilization. By splitting the conventional MOSFET-based phase leg with an optimized inductor, this paper proposes a novel MOSFET-based phase leg configuration to minimize these drawbacks. Based on the proposed phase leg configuration, a high efficiency single-phase MOSFET transformerless inverter is presented for the PV microinverter applications. The pulsewidth modulation (PWM) modulation and circuit operation principle are then described. The common-mode and differential-mode voltage model is then presented and analyzed for circuit design. Experimental results of a 250 W hardware prototype are shown to demonstrate the merits of the proposed transformerless inverter on nonisolated two-stage PV microinverter application.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2339320