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Your search keyword '"Ahn, Suk-Ho"' showing total 21 results
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21 results on '"Ahn, Suk-Ho"'

20. 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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21. Development and Optimization of High-Voltage Power Supply System for Industrial Magnetron.

Author

Jang, Sung-Roc, Ryoo, Hong-Je, Ahn, Suk-Ho, Kim, Jongsoo, and Rim, Geun Hie

Subjects
MAGNETRONS, POWER resources, CAPACITORS, MICROWAVE oscillators, MAGNETIC circuits, ELECTRIC inductance, ROBUST control
Abstract

This paper describes the design and analysis of a 42-kW (14 kV, 3 A) high-voltage power supply for a 30-kW industrial magnetron drive. The design is based on a series resonant converter in discontinuous conduction mode (DCM) to take advantage of both the superior arc protection stemming from the current source characteristics and the high power density owing to the use of parasitic elements such as the leakage inductance in the high-voltage transformer. The detailed design procedure for the resonant tank and high-voltage transformer with respect to the input and output specifications is described on the basis of a simplified analysis of the DCM series resonant converter. Special considerations for designing high-power high-voltage power supplies are provided, such as series stacking of diodes for a voltage doubling rectifier and insulation between each winding of the high-voltage transformer. In addition, a comparative study using theoretical equations, simulation, and experimental results was carried out. This study yielded the output voltage and current characteristics at different switching frequencies and verified the advantages of this topology, such as arc protection without an additional protection circuit and high efficiency due to zero-current or zero-voltage switching. Moreover, the parallel operation of two converters with phase shifted gating signal is proposed to reduce the output current ripple and increase power capability for higher power magnetron drive. Additionally, the design considerations of two auxiliary power supplies (a filament power supply: 15 V, 150 A and a magnet power supply: 50 V, 5 A) are also provided and optimized for effective driving industrial magnetron. Finally, the developed power supply was tested with a 30-kW industrial magnetron, and the results prove the reliability and robustness of the proposed scheme. [ABSTRACT FROM PUBLISHER]

Published
2011
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