A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

Abstract

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.

High Gain Boost Interleaved Converters with Coupled Inductors and with Demagnetizing Circuits

“…The converter has stiff behavior when the voltage drop from low load to the full load is 4 V. This behavior is highly valuable in applications where stiff DC voltage is required, i.e., for a DC bus for inverter stage. Figure 20 shows power loss analysis based on Equations (26)- (37). The total calculated power loss is 40.53 W (Table 3) within the peak efficiency of the converter (96.2%).…”

“…Energy losses in elements of the boost converter can be divided into inductor losses, power switch losses and diode losses [37][38][39][40]. Total energy losses P TOT is expressed as:…”

A Novel Multi-Element Resonant Converter with Self-Driven Synchronous Rectification

“…In contrast, when the CT sense the secondary-side current, which will cause large conduction losses through CT, so that it will reduce the conversion efficiency. The multi-element resonant converter has been proposed to solve the above mentioned LLC resonant converter issues [18][19][20][21][22]. Since the voltage gain curve is relatively sharp and close to zero in resonant frequency, it can decrease the inrush current to solve short output circuit issues.…”