Small-Signal Modeling of Phase-Shifted Full-Bridge Converter Considering the Delay Associated to the Leakage Inductance

Diego Ochoa, Antonio Lázaro, Pablo Zumel, Marina Sanz, Jorge Rodriguez de Frutos and Andrés Barrado
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Diego Ochoa: Power Electronics System Group, Universidad Carlos III de Madrid, 28911 Leganes, Spain
Antonio Lázaro: Power Electronics System Group, Universidad Carlos III de Madrid, 28911 Leganes, Spain
Pablo Zumel: Power Electronics System Group, Universidad Carlos III de Madrid, 28911 Leganes, Spain
Marina Sanz: Power Electronics System Group, Universidad Carlos III de Madrid, 28911 Leganes, Spain
Jorge Rodriguez de Frutos: Power Smart Control S.L., 28919 Leganes, Spain
Andrés Barrado: Power Electronics System Group, Universidad Carlos III de Madrid, 28911 Leganes, Spain

Energies, 2021, vol. 14, issue 21, 1-23

Abstract: This paper demonstrates that in the Phase-Shifted Full-Bridge (PSFB) buck-derived converter, there is a random delay associated with the blanking time produced by the leakage inductance. This random delay predicts the additional phase drop that is present in the frequency response of the open-loop audio-susceptibility transfer function when the converter shows a significant blanking time. The existing models of the PSFB converter do not contemplate the delay and gain differences associated to voltage drop produced in the leakage inductor of the transformer. The small-signal model proposed in this paper is based on the combination of two types of analysis: the first analysis consists of obtaining a small-signal model using the average modeling technique and the second analysis consists of studying the natural response of the power converter. The dynamic modeling of the Phase-Shifted Full-Bridge converter, including the random delay, has been validated by simulations and experimental test.

Keywords: small-signal model; phase-shifted full-bridge converter; DC-DC power conversion; zero-voltage-switching; injected-absorbed-current method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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