Abstract
Resonant converters such as the LLC have become an increasingly popular choice for applications which demand high efficiency. The soft-switching characteristics of resonant topologies allow higher switching frequencies to be used without compromising efficiency due to switching loss. The efficiency of the LLC topology generally peaks near its resonant frequency and steadily decreases as the switching frequency is modulated further from this point. This drawback generally limits the LLC's usefulness for wide voltage range applications. This paper aims to address this issue through the use of a hybrid switched-capacitor topology with a dynamic input voltage conversion ratio which allows operation to be confined to a tighter range of frequencies. A 40-290V (7.25:1 ratio) input, 20V, 5A output prototype was built and is shown to achieve a full load efficiency of over 93 % across the entire input voltage range.
| Original language | English (US) |
|---|---|
| Pages | 2044-2050 |
| Number of pages | 7 |
| DOIs | |
| State | Published - 2022 |
| Event | 37th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2022 - Houston, United States Duration: Mar 20 2022 → Mar 24 2022 |
Conference
| Conference | 37th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2022 |
|---|---|
| Country/Territory | United States |
| City | Houston |
| Period | 3/20/22 → 3/24/22 |
Bibliographical note
Publisher Copyright:© 2022 IEEE.
Keywords
- DC/DC
- LLC
- reconfigurable
- resonant converter
- switched capacitor
- switching
- wide range