ESR Modeling of Class II MLCC Large-Signal-Excitation Losses
METADATA ONLY
Loading...
Author / Producer
Date
2023-05
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
METADATA ONLY
Data
Rights / License
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×.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
38 (5)
Pages / Article No.
5711 - 5715
Publisher
IEEE
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
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 equation
Organisational unit
03573 - Kolar, Johann W. (emeritus) / Kolar, Johann W. (emeritus)