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All Journal International Journal of Electrical and Computer Engineering International Journal of Power Electronics and Drive Systems (IJPEDS)
Srivichai, Jeerapong
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering

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Electrocardiogram signal processing algorithm on microcontroller using wavelet transform method Phuphanin, Akkachai; Tasakorn, Metha; Srivichai, Jeerapong
International Journal of Electrical and Computer Engineering (IJECE) Vol 14, No 2: April 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v14i2.pp1530-1543

Abstract

The electrocardiogram (ECG) is an important parameter for analyzing the cardiac system. It serves as the primary diagnostic tool for patients with suspected heart disease, guiding appropriate cardiac investigations according to the disease or condition suspected. However, ECG measurements may generate noise, leading to false diagnoses. The wavelet transform is an effective and widely-used technique for eliminating noise. Typically, analysis and generation algorithms are developed on computer and using software built in. This paper presents a noise elimination algorithm based on the wavelet transform method, designed to operate on resource-limited Node microcontroller unit (MCU). An efficiency study was conducted to determine the optimum mother wavelet implementation of the algorithm, and the results showed that, when considering synthetic ECG signals, db4 was the most suitable for eliminating interference by achieving the highest signal to noise ratio (SNR) and correlation coefficient. In addition, this algorithm prototype can analyze ECG signals using the wavelet transform method processed in a microcontroller and is accurate compared to reliable programs. It has the potential to be further developed into a low-cost portable ECG signal measurement tool for use in remote medicine, healthcare facilities in resource-limited areas, education and training, as well as home monitoring for chronic patients.
Modeling and analysis of three-phase boost rectifier for DC fast EV charging Srivichai, Jeerapong; Somsai, Kittaya; Pornsuwancharoen, Nithiroth
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i2.pp1094-1106

Abstract

This research investigates the modeling and analysis of a three-phase boost rectifier for DC fast charging systems for electric vehicles (EVs). A mathematical model validated with MATLAB/Simulink simulations examines system behavior under various conditions. Performance analysis in the abc and dq coordinate systems reveals high consistency with theoretical calculations. The average voltage in the dq frame was found to be vd was 685 V and vq was 0 V, with a discrepancy of less than 0.1% from calculated values. However, the average current in the dq frame showed discrepancies due to cross-coupling effects and circuit impedance. Simulations reported id was 211.50 A and iq was 93.50 A, compared to calculated values of id was 151.97 A and iq was 0 V. For the output DC voltage and current, the average values were 983.05 V and 98.31 A, respectively. Three test cases were analyzed, consist of unbalanced three-phase conditions, voltage drops, and load step responses. Case 1 showed the highest total harmonic distortion (THD), Case 2 increased THD further, and Case 3 achieved the lowest THD, demonstrating improved stability under dynamic loads. These findings confirm the system’s minimal deviations from theoretical predictions, enhanced voltage quality, harmonic mitigation, and improved charging efficiency for EV fast charging applications.
Co-Authors Phuphanin, Akkachai Pornsuwancharoen, Nithiroth Somsai, Kittaya Tasakorn, Metha