Voltage-Controlled Capacitor - Feasibility Demonstration in DC-DC Converters

Lujie Zhang, Andrew Ritter, Craig Nies, Suman Dwari, Ben Guo, Shashank Priya, Rolando Burgos, Khai Ngo

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

This letter presents a voltage-controlled capacitor that varies from 20% to 100% of the rated capacitance (1 μF) with a control voltage from half of the voltage rating to 0 V. Capacitance, self-resonant frequency, and equivalent series resistance were measured with respect to the control voltage. An equivalent circuit and a nonlinear model derived from relationship between permittivity and electric field were created and implemented in SPICE. A buck converter with input of 12 V, output of 5 V, and switching frequency of 500 kHz was built to demonstrate the change from 85% to 40% of the rated capacitance of the voltage-controlled capacitor. The error between the simulation and experiment was limited within 10%, which verifies the model.

Original languageEnglish (US)
Article number7847426
Pages (from-to)5889-5892
Number of pages4
JournalIEEE Transactions on Power Electronics
Volume32
Issue number8
DOIs
StatePublished - Aug 2017

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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    Zhang, L., Ritter, A., Nies, C., Dwari, S., Guo, B., Priya, S., Burgos, R., & Ngo, K. (2017). Voltage-Controlled Capacitor - Feasibility Demonstration in DC-DC Converters. IEEE Transactions on Power Electronics, 32(8), 5889-5892. [7847426]. https://doi.org/10.1109/TPEL.2017.2666478