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Author: search.filters.author.Khanngern, Werachet

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    Improvement of Lightning Conductors to Prevent Creeping Discharge
    (2024-01-01)
    Sirachansawang, Pathorn
    ;
    Phommeepun, Surachai
    ;
    Tangtheerajaroonwong, Wiroj
    ;
    Buranaaudsawakul, Techatat
    ;
    Apiratikul, Promsak
    This research is a test of a lightning conductor that can prevent or reduce the distance from lightning current jumps between the lightning conductor and nearby metal. The lightning conductor must have durable insulation to protect against lightning current jumps to a certain extent. But if the separation distance (s) cannot be maintained, the potential must be coordinated with the lightning conductor to prevent the occurrence of metal arcs. This research will test the ability to protect the separation distance, s = 50 cm. A copper lightning conductor has a cross-sectional area of 50 sq.mm. and the thickness of the electrical insulation is an important part in protecting against a voltage of 600. kV. If there is no insulation to protect the voltage at 600 kV, the ability to jump the lightning current will be at a distance of 50 m. The KHV cable is important for intelligent buildings that have lightning protection systems. It can isolate electrical and electronic equipment and external lightning protection.
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    A Feasibility Study of Wireless Power Transmission to Drones with Batteryless
    (2020-10-14)
    Mahagitsirichoke, Totsapark
    ;
    Khanngern, Werachet
    This work focuses on the feasibility studying and developing wireless power transmission for drone without any on board battery. The objective of this work is to operate the drone based on wireless power transmission operated at 13.56MHz ISM frequency. The system flowchart is proposed to present the sequence of design and the experiment. The mini drone is tested at 5 cm lift level with power less than 10 W. The low loss system is designed using gallium nitride (GaN) type as switching device. Experiment results show a possibility of floating drone without battery for last long operation.
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    Conducted Emission Characteristics of an Active Snubber Boost Converter
    (2003-09-01)
    Tantisukarom, Chaiya
    ;
    Khanngern, Werachet
    ;
    Nitta, Shuichi
    In this paper, the conducted emission characteristics of an active snubber boost converter with proposed timing diagram are investigated and compared with its conventional boost converter. It is illustrated theoretically and experimentally that the soft switching technique can reduce the high switching dv/dt and di/dt rate, as well as the conducted emission noise spectra generated from the hard-switched counterpart effectively. The presented active snubber boost converter shows the line to ground and the neutral to ground conducted emission spectra significantly be improved at high frequency range over the hard-switched operation. © 2003, The Institute of Electrical Engineers of Japan. All rights reserved.