Transformerless Three-Level DC-DC Buck Converter with a High Step-Down Conversion Ratio

Yun Zhang; Xing-tao Sun; Yi-feng Wang; Hong-jun Sha

Transformerless Three-Level DC-DC Buck Converter with a High Step-Down Conversion Ratio

Vol. 13, No. 1, pp. 70-76, Jan. 2013

10.6113/JPE.2013.13.1.70

DC-DC Buck converter

High step-down conversion

Non-extreme duty cycles

Three-level

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Abstract

For high power high step-down dc-dc conversion applications, conventional three-level dc-dc converters are subject to extreme duty cycles or increased volume and cost due to the use of transformers. In this paper, a transformerless three-level dc-dc buck converter with a high step-down conversion ratio is proposed. The converter comprises two asymmetrical half bridges, which are of the neutral point clamped structures. Therefore, the output pulse voltage of the converter can be obtained in terms of the voltage difference between the two half bridges. In order to realize harmonious switching of the converter, a modulation strategy with capacitor voltages self balance is presented. According to the deduced output dc voltage function, transformerless operation without extreme duty cycles can be implemented. Experimental results from a 1kW prototype verify the validity of the proposed converter. It is suitable for ship electric power distribution systems.

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Cite this article

[IEEE Style]

Y. Zhang, X. Sun, Y. Wang, H. Sha, "Transformerless Three-Level DC-DC Buck Converter with a High Step-Down Conversion Ratio," Journal of Power Electronics, vol. 13, no. 1, pp. 70-76, 2013. DOI: 10.6113/JPE.2013.13.1.70.

[ACM Style]

Yun Zhang, Xing-tao Sun, Yi-feng Wang, and Hong-jun Sha. 2013. Transformerless Three-Level DC-DC Buck Converter with a High Step-Down Conversion Ratio. Journal of Power Electronics, 13, 1, (2013), 70-76. DOI: 10.6113/JPE.2013.13.1.70.