TY - GEN

T1 - Efficiency of Capacitively Loaded Converters

AU - Andersen,Thomas

AU - Huang,Lina

AU - Andersen,Michael A. E.

AU - Thomsen,Ole Cornelius

PY - 2012

Y1 - 2012

N2 - This paper explores the characteristic of capacitance versus voltage for dielectric electro active polymer (DEAP) actuator, 2kV polypropylene film capacitor as well as 3kV X7R multi layer ceramic capacitor (MLCC) at the beginning. An energy efficiency for capacitively loaded converters is introduced as a definition of efficiency. The calculated and measured efficiency curves for charging DEAP actuator, polypropylene film capacitor and X7R MLCC are provided and<br/>compared. The attention has to be paid for the voltage dependent capacitive load, like X7R MLCC, when evaluating the charging efficiency of converter. Based on the capacitancevoltage curve, the correct capacitance should be chosen when calculating the stored energy; otherwise misleading optimistic<br/>efficiency can always be obtained. Actually, when DEAP actuator is not available at the early developing stage, the voltage independent polypropylene film capacitor can be the equivalent capacitive load. Because of the voltage dependent characteristic, X7R MLCC cannot be used to replace the DEAP actuator. However, this type of capacitor can be used to substitute the capacitive actuator with voltage dependent property at the development phase.

AB - This paper explores the characteristic of capacitance versus voltage for dielectric electro active polymer (DEAP) actuator, 2kV polypropylene film capacitor as well as 3kV X7R multi layer ceramic capacitor (MLCC) at the beginning. An energy efficiency for capacitively loaded converters is introduced as a definition of efficiency. The calculated and measured efficiency curves for charging DEAP actuator, polypropylene film capacitor and X7R MLCC are provided and<br/>compared. The attention has to be paid for the voltage dependent capacitive load, like X7R MLCC, when evaluating the charging efficiency of converter. Based on the capacitancevoltage curve, the correct capacitance should be chosen when calculating the stored energy; otherwise misleading optimistic<br/>efficiency can always be obtained. Actually, when DEAP actuator is not available at the early developing stage, the voltage independent polypropylene film capacitor can be the equivalent capacitive load. Because of the voltage dependent characteristic, X7R MLCC cannot be used to replace the DEAP actuator. However, this type of capacitor can be used to substitute the capacitive actuator with voltage dependent property at the development phase.

KW - DEAP actuator

KW - Capacitance voltage characteristic

KW - Voltage independent capacitor

KW - Voltage dependent capacitor

KW - Energy efficiency

U2 - 10.1109/IECON.2012.6388791

DO - 10.1109/IECON.2012.6388791

M3 - Article in proceedings

SN - 978-1-4673-2420-5

SP - 368

EP - 373

BT - Proceedings of the 38th Annual Conference on IEEE Industrial Electronics Society

PB - IEEE

ER -