The Capacitors with the Highest Available Power Density in Medium Voltage Range

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Tantalum Hybrid electrolytic/electrochemical capacitors are very versatile components, used in a wide variety of applications. This paper deals with pulse discharge characteristics measurement and specific power determination of these capacitors. Capacitors with ≥ 100 V rated voltage were chosen for the measurement. The capacitors were repetitively discharged into a low resistance load. More than 140 surge discharges were made with each component. The results were statistically processed and are presented. Equivalent series resistance of Hybrid capacitors is calculated from these measurements and based on its magnitude the specific power of the components is determined. Simultaneously with tantalum Hybrid capacitors some aluminum electrolytic capacitors were measured and the results are presented as well. Based on these results the capacitors are then compared. Tantalum Hybrid capacitors have the highest volumetric specific power (related to its dimensions) in medium voltage range.