Research Article
Performance Evaluation of 50 kW AC-DC Converter Using Vienna Rectifier for EV Charging Applications
Issue:
Volume 13, Issue 1, June 2026
Pages:
1-13
Received:
2 December 2025
Accepted:
24 December 2025
Published:
19 January 2026
Abstract: The rise in Electric Vehicle (EV) usage has significantly increased the need for high-power fast charging systems that must meet rigorous performance standards. This paper examines the performance of 50 kW grid-connected EV charger. The design of the charger utilizes a dual stage Vienna rectifier at the front end, combined with a bi-directional DC-DC stage, to achieve a high-power factor, minimize total harmonic distortion (THD), and maintain stable operation of the DC bus. Vienna rectifiers are commonly utilized in high-power electric vehicle chargers because of their excellent efficiency greater than 94% and nearly unity power factor. An analysis of 50 kW charger that employs a Vienna rectifier focuses on its output ripple, input signal distortion, and power input factor. Under standard operating conditions, the performance remains equable. However, once the battery charge status surpasses 80%, the notable decline in performance occurs. In this scenario, both ripple and THD increase, and the power factor strays from unity, potentially harming the battery State of Health (SOH) during constant-voltage charging. Based on research results, this paper quantified the implication of current ripple on conversion efficiency in Electric vehicle charger through experimental verification and the results communicate that the current ripples have important influence on EV chargers.
Abstract: The rise in Electric Vehicle (EV) usage has significantly increased the need for high-power fast charging systems that must meet rigorous performance standards. This paper examines the performance of 50 kW grid-connected EV charger. The design of the charger utilizes a dual stage Vienna rectifier at the front end, combined with a bi-directional DC-...
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Research Article
Design and Implementation of an Intelligent PWM-Based Closed-Loop Speed Control System for DC Motor Performance Optimization
Issue:
Volume 13, Issue 1, June 2026
Pages:
14-19
Received:
7 March 2026
Accepted:
16 March 2026
Published:
22 July 2026
DOI:
10.11648/j.cssp.20261301.12
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Abstract: This study investigates the speed control of a DC motor using the Pulse Width Modulation (PWM) technique by analyzing the effect of different duty cycle variations on motor speed, efficiency, and overall system performance. Direct Current (DC) motors are extensively employed in industrial and automation systems because they provide superior speed control and operational flexibility. As modern industries increasingly demand higher efficiency and reduced energy consumption, effective motor speed regulation has become a critical requirement for improving overall system performance. In this context, this research explores the speed control of a DC motor through the implementation of the Pulse Width Modulation (PWM) technique, which is widely recognized for its accuracy and efficiency in power control applications. PWM operates by adjusting the duty cycle of a switching signal; consequently, the average voltage supplied to the motor can be regulated without significant power loss. By varying the duty cycle, the motor receives different effective voltage levels, and therefore its rotational speed can be controlled precisely. In this study, the behavior and performance of a DC motor are examined under multiple duty cycle conditions ranging from 20% to 100%, enabling a comprehensive evaluation of the relationship between duty cycle variation and motor speed. Both experimental observations and simulation results indicate that the motor speed increases proportionally with the duty cycle, while the system continues to maintain efficient power utilization and stable operation. Furthermore, the findings demonstrate that PWM-based control not only enhances speed regulation accuracy but also improves energy efficiency and system reliability. Consequently, PWM emerges as a highly effective and flexible technique for DC motor speed control, making it particularly suitable for modern industrial and automation applications.
Abstract: This study investigates the speed control of a DC motor using the Pulse Width Modulation (PWM) technique by analyzing the effect of different duty cycle variations on motor speed, efficiency, and overall system performance. Direct Current (DC) motors are extensively employed in industrial and automation systems because they provide superior speed c...
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,
Hemavathi R
