Phase Drift Phenomenon in Dual Active Bridge Converter – Analysis and Compensation

Vesa Väisänen; Jani Hiltunen; Raimo Juntunen

doi:10.15866/iree.v10i1.5207

Phase Drift Phenomenon in Dual Active Bridge Converter – Analysis and Compensation

Vesa Väisänen^(1*), Jani Hiltunen⁽²⁾, Raimo Juntunen⁽³⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/iree.v10i1.5207

Abstract

In this paper the mechanisms causing phase drift in the dual active bridge topology are presented and two compensation methods are proposed to overcome their effects. The phase drift causes discrepancy between the predicted phase shift and the actual phase shift measured from the transformer primary and secondary voltages. The error in the phase shift causes the input power to be larger or smaller than predicted and it can also interfere with the operation of several modulation methods. By using the phase drift compensation methods presented in this paper the converter input power can be predicted accurately by using the classical power equation. The effects of dead-time on the phase drift are also discussed and a method to calculate a suitable dead-time with respect to the converter operating point is proposed. The value of the phase drift compensation is presented along with a variable frequency modulation method, which enables zero voltage switching at a wide load range with a minimal circulating current.
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Keywords

DC-DC Power Converters; Dual Active Bridge; Error Correction; Modeling; Modulation; Power MOSFET; Switched-Mode Power Supply

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