High-Efficiency MOSFET Transformerless Inverter for Non-isolated Microinverter Applications

ABSTRACT

Best in class low-control level metal– oxide– semiconductor field-affect transistor (MOSFET)- based transformerless photovoltaic (PV) inverters can achieve high capability by using latest super convergence MOSFETs. In any case, these MOSFET-based inverter topologies encounter the evil impacts of no less than one of these drawbacks: MOSFET disillusionment danger from body diode pivot recovery, extended conduction incidents as a result of more devices, or low magnetics use. By part the conventional MOSFET based stage leg with a streamlined inductor, this paper proposes a novel MOSFET-based stage leg plan to restrict these burdens. In light of the proposed stage leg structure, a high viability single-arrange

MOSFET

MOSFET transformerless inverter is shown for the PV microinverter applications. The pulsewidth change (PWM) direction and circuit undertaking rule are then portrayed. The ordinary mode and differential-mode voltage show is then displayed and analyzed for circuit structure. Exploratory outcomes of a 250Whardware model are seemed to show the advantages of the proposed transformerless inverter on non-isolated two-sort out PV microinverter application.

 BLOCK DIAGRAM:

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Fig. 1. Two-stage nonisolated PV microinverter.

CIRCUIT DIAGRAM:

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Fig. 2. Proposed transformerless inverter topology with (a) separated magnetic and (b) integrated magnetics.

 EXPERIMENTAL RESULTS:

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Fig. 3. Output voltage and current waveforms.

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Fig. 4. PWM gate signals waveforms.

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Fig. 5. Inverter splitting inductor current waveform.

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Fig. 6. Waveforms of voltage between grid ground and DC ground (VEG ).

CONCLUSION

This paper proposes a MOSFET transformerless inverter with a novel MOSFET-based stage leg, which accomplishes:

1) high proficiency by utilizing super intersection MOSFETs and SiC diodes;

2) limited dangers from the MOSFET stage leg by part the MOSFET stage leg with streamlined inductor and limiting the di/dt from MOSFET body diode switch recuperation;

3) high magnetics use contrasted and past high proficiency MOSFET transformerless inverters in [21], [22], [25], which just have half magnetics use.

PWM

The proposed transformerless inverter has no dead-time necessity, basic PWM regulation for usage, and limited high-recurrence CMissue. A 250W hardware model has been planned, created, and tried in two-arrange nonisolated microinverter application. Exploratory outcomes exhibit that the proposed MOSFET transformerless inverter accomplishes 99.01% pinnacle effectiveness at full load condition and 98.8% CEC productivity and furthermore accomplishes around 98% attractive use. Because of the benefits of high effectiveness, low CM voltage, and enhanced attractive use, the proposed topology is alluring for two-organize nonisolated PV microinverter applications and transformerless string inverter applications.

 

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