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Efficient antiphase charging of two electrocaloric relaxor ferroelectric polymer capacitors using a 1000V SiC half-bridge converter.

Number: 0023

Author(s) : MÖNCH S., SÖLLNER A., BENNOUR I., SCHIPPER J., DOMINGUES DOS SANTOS F., ZERILLO V., DEFAY E.

Summary

Electrocaloric cooling with PVDF derivatives-based relaxor ferroelectric polymers requires high electric fields, which creates a tradeoff between dielectric layer thickness, fabrication complexity, inactive thermal mass, and operating voltage. This work investigates efficient high-voltage charging of electrocaloric capacitive loads using a simple two-level silicon-carbide half-bridge converter and analyses the effect of the applied voltage waveform on relaxor dielectric losses. A 1200 V SiC half-bridge with zero-voltage switching and hysteretic current control is used for antiphase charging of two capacitive loads. With two 3.3 uF film capacitors as a symmetric dummy load, operation up to 1000 V and converter efficiencies of about 98.6-98.7% are demonstrated. In addition, dielectric relaxation losses are analysed with a single-Debye model for sinusoidal, rectangular, triangular, and trapezoidal voltage waveforms. Preliminary measurements with PVDF derivatives-based electrocaloric capacitors show an exponential relaxation current after switching and confirm that charging speed strongly affects the electrical losses. Burst-mode operation is shown to increase the voltage transition time and substantially reduce the relaxor-related losses. The results demonstrate that a simple two-level SiC converter is a viable high-voltage solution for electrocaloric systems and that charging waveform and rise time must be considered when characterizing and operating relaxor electrocaloric devices.

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Pages: 11 p.

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Details

  • Original title: Efficient antiphase charging of two electrocaloric relaxor ferroelectric polymer capacitors using a 1000V SiC half-bridge converter.
  • Record ID : 30035072
  • Languages: English
  • Subject: Technology
  • Source: 11th IIR Conference on Solid-State Cooling, Heating and Energy Harvesting.
  • Publication date: 2026/06/07
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2026.0023

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