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Your search keyword '"TAHAMI, Farzad"' showing total 123 results
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123 results on '"TAHAMI, Farzad"'

5. Comprehensive Reliability Assessment of Buck Quasi-Resonant Converter

Author

Hasanisadi, Mohammadhesam, Tarzamni, Hadi, Tahami, Farzad, Sharif University of Technology, Department of Electrical Engineering and Automation, Aalto-yliopisto, and Aalto University

Subjects
mean time to failure (MTTF), DC-DC converters, quasi-resonant (QR) converter, reliability assessment
Abstract

Publisher Copyright: © 2022 IEEE. This paper explores reliability assessment of various Quasi-Resonant (QR) buck DC-DC converters including zero current/voltage switching and half-wave/full-wave topologies. The impacts of output power, input voltage, output voltage, and time duration on the failure rate of each component are investigated, then overall reliability performance of each converter is evaluated. A detailed comparison is performed in which reliability metric of buck soft switching topologies is compared with each other as well as their parent hard switching topology. Eventually, mean time to failure of the converters is analyzed. This approach provides insightful information for selecting the topology or components for the purpose of designing QR converters. To achieve the reliability of these converters, first, the required equations to evaluate the effective factors on the reliability are obtained. Then reliability metric values are calculated for three cases in each of which a key parameter of the converters varies over a specified range.

Published
2022

22. A novel driver assist stability system for all-wheel-drive electric vehicles

Author

Tahami, Farzad, Kazemi, Reza, and Farhanghi, Shahrokh

Subjects
Business, Electronics, Electronics and electrical industries, Transportation industry
Abstract

A novel driver-assist stability system for ail-wheel-drive Electric Vehicles is introduced. The system helps drivers maintain control in the event of a driving emergency, including heavy braking or obstacle avoidance. The system comprises a Fuzzy logic system that independently controls wheel torques to prevent vehicle spin. Another Fuzzy wheel slip controller is used to enhance the vehicle stability and safety. A neural network is trained to generate the required reference for yaw rate. Vehicle true speed is estimated by a sensor data fusion method. The intrinsic robustness of Fuzzy controllers allows the system to operate in different road conditions successfully. Moreover, the ease to implement Fuzzy controllers gives a potential for vehicle stability enhancement. Index Terms--Direct yaw-moment control, electric vehicle, fuzzy logic control, vehicle stability.

Published
2003

36. Thermal analysis of non‐isolated conventional PWM‐based DC–DC converters with reliability consideration.

Author

Tarzamni, Hadi, Esmaeelnia, Farhad Panahandeh, Tahami, Farzad, Fotuhi‐Firuzabad, Mahmud, Tohidi, Sajjad, Dehghanian, Payman, and Lehtonen, Matti

Abstract

This paper proposes analytics for reliability assessment of non‐isolated conventional pulse width modulation DC‐DC (NIDC‐DC) converters. This class of converters consists of conventional Buck, Boost, Buck–Boost, Cuk, Sepic and Zeta topologies. The proposed analytics are founded based on the Markov process principles and can effectively capture the effects of duty cycle, input voltage, output power, voltage gain, components characteristics and aging on the overall reliability performance and mean time to failure of the NIDC‐DC converters. Furthermore, the suggested framework takes both continuous and discontinuous conduction modes of each converter into account, with which the open and short circuit faults in the components are analysed. As an important outcome, the most reliable operation region of the NIDC‐DC converters are obtained with respect to different operational parameters, which is useful in design procedure. Eventually, extensive thermal experiments with an appropriate reflection of reliability metric are conducted to measure the components' temperatures and verify their performance in different operating conditions. [ABSTRACT FROM AUTHOR]

Published
2021
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