PROJECT TITLE :

Transient DC Bias and Current Impact Effects of High-Frequency-Isolated Bidirectional DC–DC Converter in Practice

ABSTRACT:

This paper presents the transient dc bias and the present impact effects of a high-frequency-isolated bidirectional dc–dc converter (IBDC) in practice because the theoretical premise within the steady method can not be glad strictly in the transient method. The transient characterizations of IBDC underneath the steady section-shift (SPS) strategy are analyzed comprehensively, and also the corresponding model is modified for all of the transient processes in the identical and different power flows. Due to the existence of the dc bias, the present model in the transient method is different from the ancient model within the steady process, and therefore the models are different with completely different operating conditions. On this basis, a transient section-shift (TPS) strategy is proposed to boost the transient performance of the SPS strategy. Unlike within the SPS strategy, the voltages of the transformer are symmetrical within the TPS strategy, which causes that the voltage–time product of the transformer voltages is zero throughout a switching amount, then eliminates the transient dc bias and improves the current impact, and more will increase the response speed of the transient method effectively. Finally, comprehensive experiments verify the theoretical analysis.