Abstract
In this paper, two multi-element resonant DC-DC converters are analyzed in detail. Since their resonant tanks have multiple resonant components, the converters display different resonant characteristics within different operating frequency ranges. Through appropriate design, both of the two proposed converters successfully lower the conversion losses and, meanwhile, broaden the voltage gain ranges as well: one converter is able to take full usage of the third order harmonic to deliver the active power, and thus the effective utilization rate of the resonant current is elevated; while the another minimizes the entire switching losses for power switching devices by restricting the input impedance angle of the resonant tank. Besides, the loss distribution is analyzed for the purpose of guiding the component design. In the end, two 500 W prototypes are fabricated to test the theoretical analyses. The results demonstrate that the two proposed converters can achieve wide voltage gain with the small frequency deviation, which noticeably contributes to highly efficient conversion. Their peak efficiencies are measured as 95.4% and 95.3%, respectively.
Highlights
Soft-switching resonant DC-DC converters have received persistent focus, and relevant studies, concentrating on the topology morphing, control strategy, parameter design and application background, are still developing.According to the characteristics of the resonant tanks, the resonant DC-DC converters present a band-pass feature and are able to filter out the high order frequency harmonics
On the basis of the classical LLC topology, considerable research has been implemented concentrating on the optimal parameter design [6,7,8], advanced control strategy [9,10], current balancing [11], bidirectional power transmission [12,13], high-frequency analysis [14,15], and over-current protection [16,17]
The resonant tank is comprised of two pairs of resonant capacitors (C1 and C2), resonant inductors (L1 and L2) and high frequency transformers (T1 and T2), being marked as the dual-CLT multi-element resonant converters (MRCs)
Summary
Soft-switching resonant DC-DC converters have received persistent focus, and relevant studies, concentrating on the topology morphing, control strategy, parameter design and application background, are still developing. On the basis of the classical LLC topology, considerable research has been implemented concentrating on the optimal parameter design [6,7,8], advanced control strategy [9,10], current balancing [11], bidirectional power transmission [12,13], high-frequency analysis [14,15], and over-current protection [16,17] Through these studies, better performances are guaranteed for the LLC converters, compared with other DC-DC converters. The MRCs have to promote the operating frequency to high values for wide voltage gain ranges, which inevitably introduces high-frequency losses Few of these converters have considered the issues of the effective utilization rate of the resonant current, the switching loss reduction and the over-current protection, which are often of great significance for resonant DC-DC converters. The experiments on two 500 W prototypes indicate that the proposed MRC topologies possess good resonant performances, and the highest efficiencies are 95.4% and 95.3%, respectively
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