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

doi:10.1109/TPEL.2017.2666478

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 journal › Article › peer-review

12 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 language	English (US)
Article number	7847426
Pages (from-to)	5889-5892
Number of pages	4
Journal	IEEE Transactions on Power Electronics
Volume	32
Issue number	8
DOIs	https://doi.org/10.1109/TPEL.2017.2666478
State	Published - Aug 2017
Externally published	Yes

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Publisher Copyright:
© 2016 IEEE.

Keywords

Controllable capacitor
nonlinear capacitor model
output ripple

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10.1109/TPEL.2017.2666478

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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.",

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AU - Zhang, Lujie

AU - Ritter, Andrew

AU - Nies, Craig

AU - Dwari, Suman

AU - Guo, Ben

AU - Priya, Shashank

AU - Burgos, Rolando

AU - Ngo, Khai

PY - 2017/8

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N2 - 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.

AB - 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.

KW - Controllable capacitor

KW - nonlinear capacitor model

KW - output ripple

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

Abstract

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