Metadata only
Date
2023-05Type
- Journal Article
Abstract
Multilayer ceramic capacitors (MLCCs) with ferroelectric Class II dielectrics enable extremely high volumetric capacitance density, and are therefore preferred in high-power-density power conversion. These MLCCs, though, suffer from a nonlinear dielectric constant and substantial low-frequency, large-signal excitation losses. Previously, a Steinmetz-parameter-based loss model accurately described these large-signal losses in MLCCs, but a difficult peak-charge measurement was required. For magnetic materials, a Steinmetz-based model is translated to an operating-point-specific effective series resistance (ESR) model, which then allows for a low-complexity loss calculation. In this letter, we introduce and verify an ESR-based loss model for MLCCs, with the ESR derived from the MLCC Steinmetz parameters. Our modeling error is below 25% across all evaluated operating points, a major improvement over modeling with the small-signal ESR provided in the MLCC datasheet, which may result in a loss approximation error of up to 10×. Show more
Publication status
publishedExternal links
Journal / series
IEEE Transactions on Power ElectronicsVolume
Pages / Article No.
Publisher
IEEESubject
AC-DC power converters; DC–AC power converters; effective series resistance (ESR); IGSE; IGSE-C; inverters; loss modeling; multilayer ceramic capacitors (MLCCs); power capacitors; rectifiers; Steinmetz equationOrganisational unit
03573 - Kolar, Johann W. (emeritus) / Kolar, Johann W. (emeritus)
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