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Author: search.filters.author.Taylim, Alisala

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    Simplified Analysis and Validation of a Two-switch Flyback Converter
    (2024-01-01)
    Wuti, Virot
    ;
    Bunlaksananusorn, Chanin
    ;
    Trakuldit, Siripan
    ;
    Tattiwong, Kaweewat
    ;
    Luangpol, Amata
    This paper presents a simplified analysis and validation of a two-switch flyback converter. When parasitic components, i.e. the MOSFET's output capacitance and transformer's leakage inductance, are neglected, circuit analysis of the two-switch flyback converter is greatly simplified and derivation of the converter equations becomes straightforward. The validity of the derived equations, which are useful for the converter design, is confirmed by simulation and experimental results.
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    A Simplified Analysis and Design of an RCD Clamp Forward Converter
    (2022-01-01)
    Wuti, Virot
    ;
    Trakuldit, Siripan
    ;
    Luangpol, Amata
    ;
    Tattiwong, Kaweewat
    ;
    Taylim, Alisala
    A conventional forward converter requires a transformer having an extra winding to assist in magnetic core reset, thus complicating the design and increasing the production cost. These shortcomings can be overcome by using an RCD clamp forward converter. This article presents a simplified analysis and design of the RCD clamp forward converter. The laboratory prototype is constructed. Experimental results demonstrates that the prototype converter is capable of providing a constant output voltage throughout its operating condition and has the maximum efficiency of 85%.
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    Frequency Domain Spectroscopy Analysis of the Water Tree XLPE Cable
    (2022-01-01)
    Sawatdimongkol, Whichakorn
    ;
    Chancharoensook, Phop
    ;
    Sawatdimongkol, Worachai
    ;
    Taylim, Alisala
    ;
    Luangpol, Amata
    Water tree is one type of insulation deterioration occurring in polymeric cables such as polyethylene, ethylene-propylene rubber, and cross-linked polyethylene (XLPE) caused by the existing impurities in the bulk insulation or imperfection of the semiconductive surface. Moreover, the water tree phenomenon affects the cable's overall lifetime and can be developed into an electrical tree, leading to the failure of the cable. Because of this, the evaluation of water trees becomes one of the most important factors in the condition assessment of the cable. This paper presents the comparison of the dielectric properties of 22 kV XLPE underground cable between aged and new (unused) cables. Furthermore, the water tree was detected in the aged cable. Besides, the evaluation of aged and new cables was performed by frequency-domain spectroscopy (FDS), which measures the insulation's complex capacitance and dissipation factors in the frequency domain. Then, the aged and new cables' complex capacitance and dissipation factor were compared. The test result found that the dissipation factor and imaginary part of the complex capacitance of the aged cable have a higher value than these of the new cable. More or less, the results show that FDS is one of the non-destructive testing methods suitable for assessing the condition of the cable insulation, which deteriorated by water tree.
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    Analysis and design of a zero-voltage-switched (ZVS) quasi-resonant buck converter operating in full-wave mode
    (2020-07-01)
    Wuti, Virot
    ;
    Luangpol, Amata
    ;
    Tattiwong, Kaweewat
    ;
    Trakuldit, Siripan
    ;
    Taylim, Alisala
    Hard-switching is typically used in most DC-DC converters, where transition of a power switch occurs when it still carries current and is subject to voltage at the same time. The hard-switching operation incurs high stress and switching losses to the device. These problems can be alleviated by zero voltage switching in which a power switch is made to turn on and off at zero voltage. This paper presents analysis and design of a Zero-Voltage-Switched (ZVS) quasi-resonant buck converter operating in full-wave mode. The prototype converter is designed and built. Test results show that the designed converter achieves zero voltage switching and possesses good output regulation throughout its operating range.