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  4. A 99.74% Efficient Capacitor-Charging Converter using Partial Power Processing for Electrocalorics
 
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2023
Journal Article
Title

A 99.74% Efficient Capacitor-Charging Converter using Partial Power Processing for Electrocalorics

Abstract
This work combines a 99.2% efficient GaN-based low-voltage fast-switching half-bridge converter with a Si-based high-voltage slow-switching and almost lossless switched capacitor multiplexer using a partial power processing approach to a six-level prototype with 99.74% efficiency. A loss breakdown shows how the ideal partial power processing efficiency is theoretically increased to 99.84% by using four additional voltage levels, but then reduced to the measured efficiency by the additional static and dynamic losses of the multiplexer. For electrocaloric heat pumps, an emerging technology for cooling and heating applications with zero global warming potential, such high charging efficiencies enable a high heat pump system coefficient of performance (COP). Based on available data of electrocaloric lead magnesium niobate (PMN)-based samples, and based on a first-principle and best-case analysis for Carnot-like cycles, it is predicted that the 99.74% electrical charging efficiency in combination with the electrocaloric material data enables to surpass 50% of the thermal Carnot limit (for cooling with a heat pump). Ultra-high efficiency of power converters thus pave the way towards future electrocaloric heat pumps of competitive system performance.
Author(s)
Mönch, Stefan  orcid-logo
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Reiner, Richard  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Mansour, Kareem
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Waltereit, Patrick  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Basler, Michael  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Quay, Rüdiger  orcid-logo
INATECH
Molin, Christian  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Gebhardt, Sylvia  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Bach, David  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Binninger, Roland  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Bartholome, Kilian  orcid-logo
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Journal
IEEE journal of emerging and selected topics in power electronics  
Open Access
DOI
10.1109/JESTPE.2023.3270375
10.24406/h-445456
File(s)
J_Emerg_Selec_Topics_Power_Electronics_2023_Moench.pdf (2.63 MB)
Rights
CC BY 4.0: Creative Commons Attribution
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Keyword(s)
  • Converter systems

  • Switched capacitor circuits

  • Zero voltage switching

  • Gallium compounds

  • Wide-band-gap devices

  • DC-DC Multilevel converter

  • Multilevel systems

  • DC-DC converter

  • Chargers

  • Electrocalorics

  • Capacitance

  • Cooling

  • System Performance

  • Energy efficiency

  • Heat pumps

  • Fraunhofer-Leitprojekt ElKaWe

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