Dynamic Performance Evaluation of Bidirectional Bridgeless Interleaved Totem-Pole Power Factor Correction Boost...

Area of Science:

• Electrical Engineering
• Power Electronics
• Materials Science

Background:

• Electric vehicles (EVs) require efficient onboard chargers.
• Bidirectional power flow is crucial for EV charging infrastructure.
• Silicon carbide (SiC) devices offer advantages over silicon (Si) for high-power applications.

Purpose of the Study:

• To evaluate the dynamic characteristics of a 6.6 kW bidirectional bridgeless three-leg interleaved totem-pole power factor correction (PFC) boost converter for EV onboard chargers.
• To assess the performance, efficiency, and power loss of SiC MOSFET modules within the proposed converter.
• To compare the proposed SiC converter with non-interleaved and Si IGBT-based topologies.

Main Methods:

• Development of a fully integrated electromagnetic-circuit coupled simulation (ECCS) model, including electromagnetic, equivalent circuit, and SiC MOSFET characterization models.
• Incorporation of parasitic effects within the ECCS model for accurate performance assessment.
• Validation of the ECCS model using double pulse tests and closed-loop converter operation data.

Main Results:

• The SiC MOSFET-based PFC boost converter achieves high efficiency and power density.
• Comparative analysis shows the interleaved SiC topology outperforms non-interleaved and Si IGBT-based converters in terms of power loss and efficiency.
• Parametric analysis identifies key operating conditions affecting converter power loss.

Conclusions:

• The proposed SiC-based interleaved totem-pole PFC boost converter is a viable solution for high-performance EV onboard chargers.
• SiC MOSFETs offer significant advantages over Si IGBTs in terms of efficiency and power density for this application.
• The validated ECCS model provides a reliable tool for analyzing and optimizing such power electronic converters.