Compact design of a 30 kV rapid capacitor charger

M. Giesselmann, E. Kristiansen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


This paper describes the downsizing potential of a power supply for charging a 7.2μF capacitor to a voltage of 30kV, which represents 3.24kJ of energy, in approximately 40ms. This process should be repeatable 10-20 times in a short burst mode within a time frame of a few minutes. The primary supply is a DC source with approximately 650V. A previous design achieved all these goals using 4 Semikron half-bridge IGBTs rated at 1200V/1200A each [1,2]. From the operational experience with the previous charger we concluded, that the weight and volume of the inverter, which is the core of the system, can be reduced to half of the previous size. This can be achieved by using advancements in IGBT modules as well as state of the art capacitors and optimum packaging. Due to the increased capabilities of the new IGBT modules, the number of required modules can be reduced from 4 to 2. In addition, the 15V/10A auxiliary power supply, which was previously required, is no longer needed, since the new modules derive their auxiliary power from the main DC bus. The new IGBT modules will be connected to form an H-Bridge. A step-up transformer and a rectifier bank will be connected to the output of the H-Bridge. For compactness, the cooling fins on the old modules have been removed, which was permissible due to the fact that the supply is only operated in short term burst mode. There are no cooling fins to remove on the new module since we are using the water-cooled version. This also gives us the option to water cool if needed. With these modifications, the original charger, which took up a standard 19 inch equipment rack, could be reduced to the size of an oversized suitcase.

Original languageEnglish
Title of host publicationPPPS 2001 - Pulsed Power Plasma Science 2001
EditorsRobert Reinovsky, Mark Newton
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780371208, 9780780371200
StatePublished - 2015
Event28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference, PPPS 2001 - Las Vegas, United States
Duration: Jun 17 2001Jun 22 2001

Publication series

NamePPPS 2001 - Pulsed Power Plasma Science 2001


Conference28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference, PPPS 2001
Country/TerritoryUnited States
CityLas Vegas


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