Bunlaksananusorn, Chanin

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Bunlaksananusorn, Chanin
Alternative Name
Bunlaksananusorn, C.
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Email
chanin.bu@kmitl.ac.th

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    Feedback compensation design for switched mode power supplies with a Right-Half-Plane (RHP) zero
    (2004-12-01)
    Kittipeerachon, K.
    ;
    Bunlaksananusorn, C.
    A boost and flyback converters operating in Continuous Conduction Mode (CCM) are notorious for their difficult control loop stabilisation and sluggish response. This paper describes feedback compensation design of these converters. Design of the two selected compensation circuits is illustrated with a CCM boost converter, with experimental results given to verify effectiveness of each compensation circuit. © 2004 KMITL. Thailand.
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    UWB Transmission Waveform Application for in an Indoor Localization System
    (2024-01-01)
    Mankong, Thanadon
    ;
    Promwong, Sathaporn
    ;
    Bunlaksananusorn, Chanin
    Nowadays, the indoor localization systems had been widely utilized. The popular use of localization system is the global position system (GPS). However, the system fails in particular environments such as indoors because low received signal power. It is not appropriate to take a position. The indoor localization system was used to assist in finding a position in an indoor environment. There are several techniques used to evaluate. Technique trilateration model is a technique of geometric. This technique leverages circular intersections to estimate target positions. The circles are derived from a set of reference positions. This paper studies on indoor positioning in line of sight (LOS) using by IEEE 802.15.4 standard in ultra wideband option which this study employs trilateration to estimate the position of target objects. Biconical antennas with vertical polarization serve as both transmitting and receiving elements. The evaluation is conducted using a vector network analyzer (VNA) across a frequency range of 3GHz to 11GHz. The positioning accuracy will be assessed in terms of distance error.
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    Compensator design for a peak current mode controlled buck converter
    (2019-07-01)
    Trakuldit, Siripan
    ;
    Bunlaksananusorn, Chanin
    This paper presents compensator design for a peak current mode controlled buck converter. Given the closed-loop converter model, the open loop and output impedance transfer functions are derived. Based on the open loop transfer function, the compensator design is carried out to yield the open loop frequency response with a desired gain, crossover frequency, and phase margin. The well designed compensator also results in small output impedance, which is an indicator for good output voltage regulation. Both simulated and experimental results are presented to validate the compensator design.
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    Distortion Analysis of the HB-UWB Transmission Waveform for WBAN Applications
    (2018-07-02)
    Sanguanpuak, Chanidaphar
    ;
    Bunlaksananusorn, Chanin
    ;
    Promwong, Sathaporn
    The body area network (BAN) is a wireless technology, which play an important role in very short range wireless communications and find a wide variety of applications such as WiMedia for relaying information gathered by biological sensors on body. The ultra wideband (UWB) technology is suitable for BAN system because of transmission by impulse radio and low power. However, signal distortion due to human body effect in human body-ultrawide band (HB-UWB) channel must be study. In this study, we evaluate HB-UWB channel which serious disturbed by the distortion. The distortion can cause extremely poor signal quality to wireless transmission channel even in free space because of the antenna characteristics and waveform distortion. Thus, the understanding of the effect from characterization of antenna and waveform effect is important. The measurement data of distortion analysis due the antenna and human body of HB-UWB for WBAN were presented in this research report. The receiver waveform template was present to maximize system signal to noise ration. The equation of Friis had been used to evaluate the results. The proposed method is practical for the HB-UWB evaluation, UWB antenna design, and provide more precision to identify the waveform distortion. The results can apply for the design of wireless medical devices which focus on the effect of human body.
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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.
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    Novel Current Feedforward Average Current Mode Control technique to improve output dynamic performance of DC-DC converters
    (2007-12-01)
    Chrin, P.
    ;
    Bunlaksananusorn, C.
    This paper proposes a novel Current Feedforward Average Current Mode Control (CFACMC) technique to improve output dynamic performance of DC-DC converters. In this new control scheme, besides its usual role as a feedback variable to a current controller, the sensed inductor current is fed forward, through a low-pass filter circuit, to sum with an output signal from a voltage controller to form the control signal. In the paper, the operating principle of CFACMC and its small signal model are described. From the small-signal model, the expression for selecting the gain of the low-pass filter to yield the improved output voltage response is derived. Both simulated and experimental results are provided to show that significant improvement in output dynamic response is achieved with CFACMC. © 2007 IEEE.
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    A Study of Low Band UWB Localization with Wooden and Metal Bookshelves Based on Measurement Data
    (2024-01-01)
    Mankong, Thanadon
    ;
    Promwong, Sathaporn
    ;
    Bunlaksananusorn, Chanin
    This paper considers the potential of Impulse-Radio Ultra-Wideband (IR-UWB) technology which can be a barcodes replacement in bookshelf management systems. To assess its feasibility, we analyze IR-UWB propagation characteristics within bookshelf environments, particularly focusing on the impact of wooden and metal structures. A measurement-based evaluation scheme is employed, utilizing a vector network analyzer (VNA) alongside microstrip patch antennas for both the transmitter (Tx) and receiver (Rx) operating within a frequency range of 3.2GHz to 4.8GHz. The path loss, received signal strength (RSS), and cumulative distribution function (CDF) of the measured data are then analyzed to evaluate the suitability of IR-UWB for bookshelf management applications. These findings will inform the design of IR-UWB antennas and the overall assessment of this technology in this specific context
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    The Study of Polarization and Depolarization Current Measurements on Service-Aged 22 kV XLPE Underground Cables with Presence of Water Trees
    (2022-01-01)
    Udomluksananon, P.
    ;
    Kunakorn, A.
    ;
    Maneerot, S.
    ;
    Bunlaksananusorn, C.
    ;
    Pannil, P.
    This paper represents the condition assessment of service-aged 22 kV XLPE insulated underground cables. From the investigation, the water trees were detected in the insulation layer. The visual inspection of underground cables reveals the presence of copper carbonate contaminated on the copper tape layer. Some underground cables have the discontinuity of the copper tape layer. To evaluate the insulation condition of the underground cables, the polarization and depolarization current (PDC) measurements were performed on both the service-aged and the new (or unused) cables. The underground cables to experiment with the length of insulation screen equal to 1 m were prepared. In this research, the PDC measurements were performed on different aspects, i.e., the testing voltages (600 V, 800 V, and 1000 V), the testing positions, the effect of the discontinuity of the copper tape layer which occurred during service, the influence of the presence of copper carbonate, and the influence of water trees in XLPE cables. The dielectric response of the underground cables by using polarization and depolarization current measurements can diagnose the problems in service-aged underground cables, but this paper needs more test data for accurate interpretation.
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    Modeling of a quadratic buck converter
    (2011-08-12)
    Karaket, Ketsuda
    ;
    Bunlaksananusorn, Chanin
    A quadratic buck converter, whose voltage conversion ratio equals square of a duty cycle, has good potential in DC-DC converter applications where a large voltage step-down is required, such as in modern automobile. This paper presents dynamic modeling of a quadratic buck converter with the State-Space averaging (SSA) technique. The SSA modeling leads to a small-signal linear dynamic model of the converter, from which the transfer functions used for feedback control design can be determined. Results are presented to verify accuracy of the obtained model. © 2011 IEEE.
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    Analysis and Experimental Verification of a Tapped Inductor Buck Converter
    (2023-01-01)
    Trakuldit, Siripan
    ;
    Tattiwong, Kaweewat
    ;
    Bunlaksananusorn, Chanin
    Modern electronic and information technology equipment require a low DC voltage for operation. Therefore, a power supply used in these devices must be capable of a wide voltage conversion. This paper presents an analysis and experimental verification of a Tapped Inductor Buck Converter (TIBC), which employs a coupled inductor to realize a steep voltage step-down gain. A prototype TIBC is built and tested. The measurement confirms that experimental results are consistent with the analytical ones.