Bunlaksananusorn, Chanin

Preferred name

Alternative Name

Bunlaksananusorn, C.

Main Affiliation

School of Engineering

chanin.bu@kmitl.ac.th

Now showing 1 - 10 of 17

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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 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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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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Improvement of output dynamic performance of an average current mode controlled buck converter with a parallel controller
(2010-09-17)
Chrin, P.
;
Trakuldit, S.
;
Polmai, S.
;
Bunlaksananusorn, C.
This paper presents a parallel voltage controller to improve the output dynamic performance of a buck converter with Average Current Mode Control (ACMC). The parallel controller is a high-order controller synthesized from parallel connection of the two basic controllers. It is proposed to compensate the control-to-output transfer function of the converter, which has multiple poles and zeros. Up until now, the task is commonly performed by the two-pole one-zero controller, which is clearly not adequate and has somewhat limited the dynamic performance of the converter. In the paper, the design of parallel controller is illustrated with a 5V/2V ACMC buck converter. Experimental and simulated results that show the improvement of output voltage response to a step load change are presented. © 2010 IEEE.
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A low-cost flyback converter with primary side regulation for a TV set top box
(2017-10-19)
Khemmanee, Bundit
;
Chuladaycha, Nontawat
;
Bunlaksananusorn, Chanin
In consumer electronic products, there is a high demand for an off-line low-power Switched Mode Power Supply (SMPS). Applications invariably require the SMPS be small, lightweight, reliable, and low cost. This paper presents the design of a low-cost flyback converter to power a TV set top box. To reduce costs, the conventional output feedback circuit using an opto-coupler is removed and replaced by the feedback circuit using an auxiliary winding of the flyback transformer. This feedback technique is literally called Primary Side Regulation (PSR). In the PSR, the output regulation performance largely depends on good coupling between the secondary and auxiliary windings. The paper considers two transformer winding methods and their impacts on output voltage regulation are compared. Experimental results are provided to verify the output performance given by each winding technique.
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Design and implementation of an integrated boost-flyback converter
(2015-01-01)
Tattiwong, K.
;
Bunlaksananusorn, C.
This paper presents design and implementation of a Integrated boost-flyback converter (IBFC). Operation of the IBFC is described and its key voltage and current equations are given. The practical design of a 96W, 12V-to-48V, IBFC is demonstrated. Experiment on the prototype IBFC shows that it operates with good output voltage regulation and achieves the highest efficiency of 87%.
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Two-phase induction motor drive improvement for PV water pumping system
(2017-01-30)
Hayakwong, Ekkawid
;
Kinnares, Vijit
;
Bunlaksananusorn, Chanin
\n recent years, solar energy sources have been widely utilized, especially in PV water pumping system. Single-phase induction motors (SPIM) are the most common type of motor used in PV pumping application. Reliable operation, low cost and low maintenance are the main advantages of SPIM. However, SPIM have an inherent problem of low efficiency at low speeds, which can be overcome by the adoption of two-phase induction motors (TPIM). This paper proposes a new speed control method for the TPIM used in PV water pumping system. The TPIM is supplied with unbalanced two-phase voltages generated by the inverter that employs the carrier-based SVPWM switching strategy. The V/F control is incorporated to realize variable speed operation. The motor reference speed is set to be proportional to the power generated by the PV array. As a result, the motor speed always tracks power fluctuation of the PV array, leading to improved system efficiency. The validity of the proposed method is verified by simulation results.
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A novel clamp-mode coupled-inductor boost converter with high step-up voltage gain
(2017-03-01)
Tattiwong, Kaweewat
;
Bunlaksananusorn, Chanin
In this paper, a new coupled inductor DC-DC converter with a high step-up voltage gain is proposed. It is developed from a clamp-mode coupled-inductor boost converter by incorporating an additional capacitor and diode. The proposed converter is able to achieve the higher voltage gain, while still retaining the switch voltage clamp property of its predecessor. In the paper, operation and analysis of the proposed converter are described. Experimental results from a prototype converter are presented to verify the validity of the analysis. The prototype circuit attains the highest efficiency of 92.8%.
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A Transformerless Multi-Cell Solid-State Fault Current Limiter for Medium Voltage Power System
(2018-10-22)
Techama, Pantarote
;
Polmai, Sompob
;
Bunlaksananusorn, Chanin
This paper proposes a transformerless solid-state fault current limiter composed of multiple cells of single-phase bridge controlled rectifier with DC reactor and an AC reactor connected in parallel with cascaded rectifier cells performing current limiting in steady state. The proposed fault current limiter can be used in medium-voltage power system without power transformer so the system is more compact. With modular design of each rectifier cell, the construction and maintenance of the system could also be simplified. In this paper, the circuit designs, the computer simulation and the construction of the solid-state fault current limiter prototype are presented. The simulation and experimental results show that the proposed fault current limiter can operate properly.

Bunlaksananusorn, Chanin

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