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    Design of DC/AC Unidirectional Inverter Based on DSP with Second-Order Switching Sequence Control in Photovoltaic DC Nano-Grids
    (2025-01-01)
    Bi, Chenxing
    ;
    Jiriwibhakorn, Somchat
    Conventional inverters predominantly utilize Pulse-Width Modulation (PWM) control, operating in an intermediate state between the averaged and actual switching models. However, this approach often results in suboptimal output power quality and limited dynamic performance, which can compromise the operational stability of AC load systems. To address these limitations, this paper proposes a second-order Switching Sequence Control (SSC) strategy based on sliding mode theory, offering discrete-time control with enhanced robustness and precision. A comprehensive mathematical model of a single-phase LC inverter is developed and discretized. The SSC control algorithm is implemented using a TMS320F28335 Digital Signal Processor (DSP), with code generated via MATLAB/Simulink to streamline development and ensure real-time execution. Extensive simulations under various conditions demonstrate that the proposed inverter achieves excellent tracking accuracy, strong dynamic response, and reduced Total Harmonic Distortion (THD) is only 0.48%. Compared with conventional PWM, Selective Harmonic Elimination (SHE), and FPGA-based control methods, the SSC strategy significantly improves waveform fidelity and transient performance. These results confirm its suitability for high-performance applications in photovoltaic DC nanogrids, smart energy systems, and critical load support scenarios.
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    Design QPSK Communication System by Software-Defined Radio (SDR)
    (2023-01-01)
    Tooprakai, Siraphop
    ;
    Kobthanyakit, Korpakit
    ;
    Suwanmad, Tin
    ;
    Moungnoul, Phichet
    This paper presents the design of a QPSK communication system with Software-Defined Radio (SDR). SDR communication system is a system that uses software to control the digital signal processing (DSP) within a communication system, such as a mixer, filter, modulator and demodulator circuits, etc. This SDR communication system is flexible. and easy to update. Choose a hardware platform and software, which is USRP B210 and MATLAB, respectively. Design and test the QPSK communication system for both receiving and transmitting.
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    Portable ECG real time signal monitoring device
    (2016-01-01)
    Purahong, Boonchana
    ;
    Tongkrairat, Somsin
    ;
    Nomura, Hideyuki
    ;
    Kanamori, Chisato
    ;
    Aoyama, Hisayuki
    This paper introduces about the application of Embedded system for analyzing heart rate signal in ECG (Electrocardiography) format using Microcontroller. Microcontroller must process signal in DSP method in this case the heart rate signal must be processed in real- Time. Our system can analyze heart rate to find the frequency of heart beat and show ECG signal and heart rate on display of Microcontroller board. To obtaining heart rate signal we use electrode placed on body in lead 2 orientations. We decide to make our system portable and can run on battery all over a day for recording signal to analyze during a day.