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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    Analysis design and experimental verification of a two-switch forward converter
    (2015-12-01)
    Wuti, V.
    ;
    Bunlaksananusorn, C.
    A forward converter is an isolated DC-DC converter widely used in switching power supplies with output power ratings ranging from 50W to 400W. The conventional forward converter requires a transformer with a tertiary winding to assist in magnetic core reset and subjects its power switch to a high voltage at turn-off. These shortcomings are eliminated in the two-switch forward converter. This paper presents analysis, design and experimental verification of a two-switch forward converter. First, the converter operation is analyzed, enabling its key equations and important waveforms to be established. Then, the converter design, including both the power circuit and feedback controller, is illustrated in detail. Finally, experimental results from the prototype circuit are presented to confirm the validity of the analysis and design.
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    Analysis design and experimental verification of a quadratic boost converter
    (2015-01-26)
    Tattiwong, K.
    ;
    Bunlaksananusorn, C.
    This paper presents analysis, design and experimentation of a Quadratic Boost Converter (QBC). Operation of the QBC is analyzed, leading to mathematical expressions that can be used to design the converter. Based on the derived analytical expressions, a 100W, 12V-to-48V, QBC converter is designed and built. Experiment shows that the prototyped converter operates satisfactorily throughout its operating range and achieves the highest efficiency of 83%.
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    Dynamic modeling and closed-loop control of a tapped inductor buck converter
    (2021-06-02)
    Trakuldit, Siripan
    ;
    Bunlaksananusorn, Chanin
    Modern smart electronic and information technology (IT) devices require a low DC voltage for operation. The low supply voltage is typically provided by a dedicated DC−DC converter by stepping down the system's bus voltage (e.g., 12 V). It is essential that the converter possesses a large voltage step-down gain and, at the same time, operates at high efficiency. A tapped inductor buck converter (TIBC) is a topology that has a potential to meet these requirements. It has a simple circuit structure and high efficiency similar to a buck converter, but can give a larger voltage step-down gain. This paper presents a dynamic modeling and closed-loop control of a TIBC. The state space averaging (SSA) method is adopted for the dynamic modeling to derive small-signal transfer functions of the converter. Based on the duty-cycle-to-output voltage transfer function, a closed-loop control is designed to keep the converter's output voltage constant. To verify the design, a prototype TIBC with closed-loop control is implemented. Experimental results show that the prototype converter has good output voltage regulation and fast transient response when subject to a step load. The effect of the crossover frequency and phase margin on the converter's transient response is also illustrated.