Investigation of Soft-Switching QSW Technique in DC#x002F;DC SiC-Based Flying Capacitor Converter With Q2L Control

Rafal Kopacz; Michal Harasimczuk; Przemyslaw TrochimiukJacek Rabkowski

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Investigation of Soft-Switching QSW Technique in DC#x002F;DC SiC-Based Flying Capacitor Converter With Q2L Control

机译：Investigation of Soft-Switching QSW Technique in DC#x002F;DC SiC-Based Flying Capacitor Converter With Q2L Control

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摘要

This article investigates the soft-switching quasi-square-wave (QSW) technique in dc#x002F;dc SiC-based flying capacitor converter with quasi-two-level (Q2L) control establishing design guidelines for constructing high-efficiency soft-switched bidirectional converters with low-voltage power transistors. The general idea behind the soft-switching in the proposed system is based on near critical conduction mode operation using TCM (triangular current mode) and Q2L control with the addition of auxiliary transistor capacitances. The soft-switching process is based on a resonance between the capacitances in parallel to each transistor, and the main inductor#x2014;ZVS at turn on is ensured through proper modulation pattern according to TCM-Q2L control, and the turn- off soft-switching mechanism is assured through the novelty in the form of adding auxiliary capacitance in parallel to each of the SiC power mosfet s according to the QSW operation. Thus, the converter can reach very high efficiency (peak at 99.5#x0025;), maintaining soft-switching for a wide operating range, using only small auxiliary SMD capacitors and a low-volume flying capacitor, leading to high power density. The presented study is based on experimental tests using a 1.5 kV model at up to 15 kW and includes the impact of various auxiliary capacitance values and optimal capacitor value selection for maximizing the converter efficiency.

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来源
《IEEE Transactions on Industrial Electronics》 |2023年第9期|9035-9045|共11页
作者
Rafal Kopacz; Michal Harasimczuk; Przemyslaw TrochimiukJacek Rabkowski;
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作者单位

Warsaw University of Technology;

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原文格式 PDF
正文语种英语
中图分类无线电电子学、电信技术;
关键词
DC–DC power conversion; power converter; power electronics; power mosfet s; zero-voltage switching; Transistors; Capacitors; Capacitance; Voltage; Zero voltage switching; Switches; Density measurement;

Investigation of Soft-Switching QSW Technique in DC#x002F;DC SiC-Based Flying Capacitor Converter With Q2L Control

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