New ZVZCS TL DC–DC converter with combined operation modes

Kexin Xu; Yong Shi; Yuting Wang; Qianhe Zhang; Zelong Feng; Xiaoxin Wang

New ZVZCS TL DC–DC converter with combined operation modes

Vol. 24, No. 8, pp. 1241-1252, Aug. 2024

10.1007/s43236-024-00791-8

Three-level DC–DC converter (TLDC)

Variable structure

Asymmetric pulse-width modulation (APWM) control

Zero-voltage and zero-current switching (ZVZCS)

Abstract

Three-level DC–DC converters (TLDCs) have attracted industrial and academic attention because of low main switching voltage ratings, simple clamping structure, and good soft-switching characteristics. This paper proposes a new TLDC with combined operation modes, which can operate in both zero-voltage switching (ZVS) and zero-voltage zero-current switching (ZVZCS) modes. The proposes converter varies soft switching mode with a simple switching combination of Sr1 and Sr2, and follows the best efficiency curves over a wide load range. Compared to conventional ZVS or ZVZCS TLDCs, this solution minimizes the circulating current and increases the overall efficiency. In addition, the current stress of the flying capacitor is also low. And, all these good features are realized by two low VA rating MOSFETs. This paper discusses the circuit, operating principles, and some steady-state characteristics. Finally, experimental data from a 1 kW prototype demonstrates the validity and characteristics of the proposed converter.

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Cite this article

[IEEE Style]

K. Xu, Y. Shi, Y. Wang, Q. Zhang, Z. Feng, X. Wang, "New ZVZCS TL DC–DC converter with combined operation modes," Journal of Power Electronics, vol. 24, no. 8, pp. 1241-1252, 2024. DOI: 10.1007/s43236-024-00791-8.

[ACM Style]

Kexin Xu, Yong Shi, Yuting Wang, Qianhe Zhang, Zelong Feng, and Xiaoxin Wang. 2024. New ZVZCS TL DC–DC converter with combined operation modes. Journal of Power Electronics, 24, 8, (2024), 1241-1252. DOI: 10.1007/s43236-024-00791-8.