High Frequency High Boost Ratio Dc-dc Converters with Wide Bandgap Devices for PV System Applications
Author | : Cong Li |
Publisher | : |
Total Pages | : 164 |
Release | : 2014 |
Genre | : |
ISBN | : |
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Chapter 4 focuses on solving common problems of high boost ratio resonant converters, such as large power requirements on the passive components, and high circulating current at light load conditions. Adaptive inductor is discussed as a possible way to decrease the system size and increase system efficiency. Chapter 5 proposes a family of switched capacitor-inductor (C-L) circuits which is largely based on parallel charging serial discharging technique. A comparison of the two solutions proposed in Chapter 4 and 5 shows that the solution in Chapter 5 is more feasible with available materials and existing technologies. Therefore, a 1.2 kW lab prototype, with an input voltage ranges between 20 V and 40 V and a constant output voltage at 1000 V was built and tested. During the tests, the switching frequency was set at 187.5 kHz. Experimental results have validated the proposed circuit topology and demonstrated a 96.1% peak efficiency and an overall efficiency over 94.5%.