Analysis of LLC Converters in ISOP-Systems with Iterative First Harmonic Approximation

Conference: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/06/2025 - 05/08/2025 at Nürnberg, Germany

doi:10.30420/566541294

Proceedings: PCIM Conference 2025

Pages: Language: englishTyp: PDF

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Authors:
Breidenstein, Daniel; Blamberger, Lukas; Duerbaum, Thomas

Abstract:
An input-series and output-parallel connection of DC-DC converters enables the extension of voltage and power capabilities for available power semiconductors. The inherent balancing characteristic ensures equal power distribution when controlling all modules with a common control signal. However, parameter tolerances cause mismatches. To study their impact in a system consisting of LLC converters, this paper presents a new method based on iterative first harmonic approximation. The power distribution between two LLC converters within the ISOP-system is derived for estimated tolerances. A test setup consisting of two GaN-based LLC converters with an intentionally caused parameter mismatch verifies the new model.