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Your search keyword '"Jang, Sung-Roc"' showing total 105 results
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105 results on '"Jang, Sung-Roc"'

38. Simplified Design of a Solid State Pulsed Power Modulator Based on Power Cell Structure.

Author

Jang, Sung-Roc, Yu, Chan-Hun, and Ryoo, Hong-Je

Subjects
*ELECTRONIC modulators, *INSULATED gate bipolar transistors, *SEMICONDUCTOR switches, *PULSE transformers, *CAPACITOR banks
Abstract

This study presents a simplified design for a solid state pulsed power modulator (SSPPM) based on a power cell structure. Similar to the Marx generator, the power cell structure has advantages such as reliability and modularity. In addition, the proposed SSPPM includes a capacitor charger that is simple and compact. The operating principle of, and the design considerations taken for, the SSPPM are discussed from a practical viewpoint. Based on a reasonable approximation, simplified design equations are developed for a capacitor charger and a high-voltage pulse-switching part, which are comprised of an LCC resonant converter and a power stage, respectively. Accordingly, detailed design procedures are proposed to develop the SSPPM with the following specifications: 40 kV, 20 A, 300 μs, 200 Hz, and 50 kW. The experimental results verify the specifications at the rated operating condition with an efficiency of 92.4%, and also confirm reliable arc-protection performance. Finally, the proposed design methodology, which utilizes simplified equations, can be used for designing an SSPPM based on the power cell structure for extensive applications. [ABSTRACT FROM PUBLISHER]

Published
2018
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50. Comparison of DCM and CCM operated resonant converters for high-voltage capacitor charger.

Author

Ji-Woong Gong, Ahn, Suk-Ho, Ryoo, Hong-Je, and Jang, Sung-Roc

Abstract

This paper describes the comparison of two a resonant converters for high-voltage capacitor charger which were designed based on a series resonant converter operating at a discontinuous conduction mode, and a continuous conduction mode, respectively. In addition to the investigation of general advantages and disadvantages of each topology as a high-voltage capacitor charger, a detailed implementation procedure and consideration depending on the analysis of losses, as well as the control characteristic of two resonant converters are discussed in practical manner. Based on the theoretical calculation and the PSpice simulation, two high-voltage capacitor chargers were developed with design criteria which aim to achieve the efficiency greater than 90% at the rated load operation. Finally, various kinds of experiments were performed and the results were provided in order to verify the design as well as to compare the charging efficiency and characteristics of two resonant converter topologies. [ABSTRACT FROM PUBLISHER]

Published
2013
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