Stacked Annular form Factor Film Capacitors for High Voltage and High Current Applications

Abstract

An annular form factor dry film capacitor having the minimum possible Equivalent Series Inductance (ESL) has been developed for short pulse applications requiring high currents at voltages below 10 kV DC. This part is based on a multi-section design, which provides very good voltage grading between the end faces of the capacitor. This grading is preserved when using the capacitor as a building block for a stacked series assembly to realize much higher operating voltages. As such, the dielectric design of the resulting assembly is greatly simplified. Furthermore, the annular form factor greatly simplifies interconnections between capacitors, thus providing a high voltage capacitor stack with an ESL comparable to conventional configurations. Electrical and mechanical aspects of series stacked annular capacitors are discussed, including interconnect conductive "gasket" materials and mechanical clamping arrangements. A stacked capacitor design is presented along with preliminary test data.

A Double Uneven Power Converter-Based DC–DC Converter for High-Power DC Grid Systems

“…To reduce the voltage fluctuations caused by the current ripples on both the input and output sides, the filter capacitors, C in and C o , are required to be placed as close as possible to the input and output terminals. The high-voltage power capacitor technology, such as a power ring film capacitor [23], has been developed recently due to the rapid development of HVDC systems and might be used to effectively suppress the voltage ripples caused by the high current ripples.…”