Title:	Floating Voltage Sensing Based on Ceramic Capacitor Ferroelectric Derating
Authors:	Michal, Vratislav
Citation:	2022 International Conference on Applied Electronics: Pilsen, 6th – 7th September 2022, Czech Republic, p. 121-124.
Issue Date:	2022
Publisher:	Fakulta elektrotechnická ZČU
Document type:	konferenční příspěvek conferenceObject
URI:	http://hdl.handle.net/11025/49864
ISBN:	978-1-6654-9482-3
Keywords:	snížení výkonu kondenzátoru;feroelektrický jev;hystereze kondenzátoru;izolované měření napětí;vícevrstvé keramické kondenzátory
Keywords in different language:	capacitor derating;ferroelectric effect;capacitor hysteresis;isolated voltage measurement;multilayer ceramic capacitors (MLCC)
Abstract in different language:	This paper presents methods allowing to provide galvanically isolated DC voltage measurement with nearly infinite input impedance. Measurement is based on a ferroelectric effect, creating hysteretic capacitance vs. bias- voltage (C-V) dependence of the ordinary multilayer ceramic capacitors. Voltage measurement is based on AC impedance sensing of a high-density multilayer ceramic capacitor and comparing with ground-referred matched capacitor with corresponding DC bias voltage. Corresponding DC bias voltage is provided by negative impedance converter and a feedback network. Despite finite accuracy (~1%), voltage sensing performed by a capacitor can be advantageous as it allows to implement AC (high-voltage) coupling, and presents nearly ideal infinite input impedance. This can be beneficial in a variety of applications e.g. in power management systems, energy harvesting applications, or scientific instrumentation.
Rights:	© IEEE
Appears in Collections:	Applied Electronics 2022 Applied Electronics 2022

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