DSP Based Series-Parallel Connected Two Full-Bridge DC-DC Converter with Interleaving Output Current Sharing

Deshang Sha; Zhiqiang Guo; Xiaozhong Liao

DSP Based Series-Parallel Connected Two Full-Bridge DC-DC Converter with Interleaving Output Current Sharing

Deshang Sha

Zhiqiang Guo

Xiaozhong Liao

Vol. 10, No. 6, pp. 673-679, Nov. 2010

10.6113/JPE.2010.10.6.673

Current sharing

Digital control

Input-series and output-parallel

Modular DC/DC converters

Phase-shifted fullbridge

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Abstract

Input-series-output-parallel (ISOP) connected DC-DC converters enable low voltage rating switches to be used in high voltage input applications. In this paper, a DSP is adopted to generate digital phase-shifted PWM signals and to fulfill the closed-loop control function for ISOP connected two full-bridge DC-DC converters. Moreover, a stable output current sharing control strategy is proposed for the system, with which equal sharing of the input voltage and the load current can be achieved without any input voltage control loops. Based on small signal analysis with the state space average method, a loop gain design with the proposed scheme is made. Compared with the conventional IVS scheme, the proposed strategy leads to simplification of the output voltage regulator design and better static and dynamic responses. The effectiveness of the proposed control strategy is verified by the simulation and experimental results of an ISOP system made up of two full-bridge DC-DC converters.

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Cite this article

[IEEE Style]

D. Sha, Z. Guo, X. Liao, "DSP Based Series-Parallel Connected Two Full-Bridge DC-DC Converter with Interleaving Output Current Sharing," Journal of Power Electronics, vol. 10, no. 6, pp. 673-679, 2010. DOI: 10.6113/JPE.2010.10.6.673.

[ACM Style]

Deshang Sha, Zhiqiang Guo, and Xiaozhong Liao. 2010. DSP Based Series-Parallel Connected Two Full-Bridge DC-DC Converter with Interleaving Output Current Sharing. Journal of Power Electronics, 10, 6, (2010), 673-679. DOI: 10.6113/JPE.2010.10.6.673.