K. Harris, F. Cathell, B. E. Strickland, J. Crawford, M. Jung, W. Mayerhofer, T. Schweizer, E. Zeyfang
{"title":"240 kJ/s and 120 kJ/s power supplies for high regulation, minimum unplanned downtime applications","authors":"K. Harris, F. Cathell, B. E. Strickland, J. Crawford, M. Jung, W. Mayerhofer, T. Schweizer, E. Zeyfang","doi":"10.1109/PPC.1995.599819","DOIUrl":null,"url":null,"abstract":"Maxwell Laboratories, Inc. (MLI) has designed, delivered and tested power supplies rated at 240 kJ/s, 50 kV and 120 kJ/s, 30 kV to DLR for use in a high-power, pulsed CO/sub 2/ laser. The optical performance of this electron-beam sustained laser with an active volume of 20 liters and a transversal gas flow is strongly dependent on the shot-to-shot repeatability of the power supply(s). Testing of the power supplies was performed by operating the electron-beam and main discharge pulse forming networks (PFNs) into a resistive load at the maximum repetition-rate of the laser, 100 Hz, for the rated burst length of 1000 pulses. The PFN was switched using a rep-rate spark gap pressurized with compressed air to less than 3 atm of pressure. The regulation (shot-to-shot repeatability) of the 240 kJ/s supply operating at 40-45 kV was </spl plusmn/0.05%. This regulation was achieved through the use of a modular power supply design using 12 kJ/s CCDS switching power supply modules. In addition to the patented high regulation topology of the individual CCDS units, the key to achieving the high regulation is reducing the size of the quantum of charge delivered at the end of the charging cycle. The techniques used to assure graceful degradation (unplanned downtime minimization), high regulation and user friendly assembly as well as the technique for parallel control of tens of modules are discussed in this paper. In addition, a comparison of the practical limitations, advantages and disadvantages of this technique verses conventional 60 Hz approaches are discussed.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":"38 1","pages":"1437-1442 vol.2"},"PeriodicalIF":0.0000,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PPC.1995.599819","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Maxwell Laboratories, Inc. (MLI) has designed, delivered and tested power supplies rated at 240 kJ/s, 50 kV and 120 kJ/s, 30 kV to DLR for use in a high-power, pulsed CO/sub 2/ laser. The optical performance of this electron-beam sustained laser with an active volume of 20 liters and a transversal gas flow is strongly dependent on the shot-to-shot repeatability of the power supply(s). Testing of the power supplies was performed by operating the electron-beam and main discharge pulse forming networks (PFNs) into a resistive load at the maximum repetition-rate of the laser, 100 Hz, for the rated burst length of 1000 pulses. The PFN was switched using a rep-rate spark gap pressurized with compressed air to less than 3 atm of pressure. The regulation (shot-to-shot repeatability) of the 240 kJ/s supply operating at 40-45 kV was
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