C‑LLC‑LL resonant converter with wide‑gain‑range and low‑stress for hold‑up operation


Vol. 21, No. 9, pp. 1283-1295, Sep. 2021
10.1007/s43236-021-00280-2




 Abstract

For applications with hold-up time requirements, the LCLC converter can achieve a wider voltage gain range than the LLC converter without degrading the normal operation efficiency due to its variable-magnetizing-inductor (VML) structure, which is formed by an inductor and an additional capacitor. However, the wide gain range achieved by the VML is at the expense of a high resonant voltage stress of the VML’s capacitor, which affects the converter volume/cost. Hence, to solve the contradiction between wide gain range and low capacitor voltage stress when the VML technique is adopted for holdup operation, this paper proposes a novel C-LLC-LL converter. Specifically, the VML is arranged into a novel C-dual-LL structure. By relying on the unique output voltages relation between C-dual-LL’s two branches, the reduced voltage stress of the VML’s capacitor and the expanded voltage gain range can be simultaneously realized. To evaluate the feasibility of the proposed solution, a comprehensive analysis is conducted, and experimental results obtained from a 500-W C-LLC-LL prototype are also provided.


 Statistics
Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.



Cite this article

[IEEE Style]

X. Ma, P. Wang, Z. Wang, B. Li, "C‑LLC‑LL resonant converter with wide‑gain‑range and low‑stress for hold‑up operation," Journal of Power Electronics, vol. 21, no. 9, pp. 1283-1295, 2021. DOI: 10.1007/s43236-021-00280-2.

[ACM Style]

Xiaochen Ma, Ping Wang, Zhishuang Wang, and Bo Li. 2021. C‑LLC‑LL resonant converter with wide‑gain‑range and low‑stress for hold‑up operation. Journal of Power Electronics, 21, 9, (2021), 1283-1295. DOI: 10.1007/s43236-021-00280-2.