Power and current balancing control of HB Q‑CLLC converters under unbalanced resonant tanks in SST applications

Lukas Antonio Budiwicaksana; Dong-Choon Lee

Power and current balancing control of HB Q‑CLLC converters under unbalanced resonant tanks in SST applications

Lukas Antonio Budiwicaksana

Dong-Choon Lee

Vol. 25, No. 5, pp. 837-848, May 2025

10.1007/s43236-025-01042-0

Solid-state transformers

Abstract

This paper proposes an efficient control strategy for power and current balancing of half-bridge quadruple-CLLC (HB Q-CLLC) converters under unbalanced resonant tanks. This converter consists of a three-input and single-output structure, which requires crucial attention when the resonant tanks are unbalanced, particularly owing to parameter tolerances. Consequently, operation with variable or constant frequency modulations are not effective, resulting in unequal current and voltage stresses. Moreover, there is a low possibility of improving the modulation scheme in the HB structure. Therefore, the only way to improve the performance of this converter is by modification of its control scheme. It is found that both phase-shift and frequency controls should be applied to balance the input power and resonant inductor current simultaneously. In addition, the proposed method is simple and does not require hardware modifications. Experimental results have verified the effectiveness of the proposed control strategy with a 3-kW prototype. It is shown that the unbalance factor of input power and inductor current can be reduced from 40–48% to 1– 3% and from 30–60% to 2–6%, respectively.

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]

L. A. Budiwicaksana and D. Lee, "Power and current balancing control of HB Q‑CLLC converters under unbalanced resonant tanks in SST applications," Journal of Power Electronics, vol. 25, no. 5, pp. 837-848, 2025. DOI: 10.1007/s43236-025-01042-0.

[ACM Style]

Lukas Antonio Budiwicaksana and Dong-Choon Lee. 2025. Power and current balancing control of HB Q‑CLLC converters under unbalanced resonant tanks in SST applications. Journal of Power Electronics, 25, 5, (2025), 837-848. DOI: 10.1007/s43236-025-01042-0.