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    Isolated high step-up switched-boost DC/DC converter with modified control method

    , Article IET Power Electronics ; Volume 12, Issue 14 , 2019 ; 17554535 (ISSN) Abbasi Aghdam Meinagh, F ; Babaei, E ; Tarzamni, H ; Kolahian, P ; Sharif University of Technology
    Institution of Engineering and Technology  2019
    In this study, a new isolated high-gain switched-boost DC/DC converter employing two symmetrical switched-boost networks along with a modified control algorithm based on the combination of the pulse-width modulation (PWM) and phase-shift modulation is proposed. Utilising symmetrical switched-boost networks increase the voltage gain of the proposed converter, significantly. Moreover, applying the proposed switching algorithm on the proposed isolated switched-boost DC/DC converter leads to the following advantages: (i) high-voltage gain, (ii) zero voltage switching (ZVS) turn-on of two switches, (iii) ZVS turnoff of two switches and (iv) appearing three controllable parameters (the... 

    Integrated monolayer planar flux transformer and resonator tank circuit for high-$t-{c}$ rf-squid magnetometer

    , Article IEEE Transactions on Applied Superconductivity ; Volume 27, Issue 4 , 2017 ; 10518223 (ISSN) Shanehsazzadeh, F ; Jabbari, T ; Qaderi, F ; Fardmanesh, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2017
    The authors propose a new design for monolayer superconducting planar flux transformer integrated with a coplanar resonator serving as a gigahertz range tank circuit for high-Tc rf-SQUID magnetometers. Based on the proposed design, which is optimized using the finite element method, the transformer-resonator configuration is made of 200-nm-thick monolayer YBCO film on a crystalline LaAlO3 substrate. In this optimized design, the SQUID magnetometer is coupled through flip-chip configuration with the configuration providing high coupling coefficient between the devices. The design permits coupling of the rf signals to the SQUID efficiently, whereas the transformer is designed to couple the dc... 

    A fault-tolerant strategy for three-phase dual active bridge converter

    , Article 10th International Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2019, 12 February 2019 through 14 February 2019 ; 2019 , Pages 253-258 ; 9781538692547 (ISBN) Davoodi, A ; Noroozi, N ; Zolghadri, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Due to several advantages, three-phase Dual Active Bridge (DAB) converter is widely used in numerous applications nowadays. On the other hand, this converter is very vulnerable to Transistor Open-Circuit Fault (TOCF). Therefore, a fault-tolerant (FT) scheme has been proposed in this paper to solve the problem. First, normal and faulty conditions are investigated, and according to the results, a fault-diagnosis (FD) approach is introduced. Using the outcomes of FD unit, a new post-fault strategy is proposed for the converter. The FD method is based on the DC component of transformer phase currents, and the basis of FT technique is shedding the faulty phase. Some benefits of the proposed... 

    Analysis and reliability evaluation of a high step-up soft switching push-pull DC-DC converter

    , Article IEEE Transactions on Reliability ; Volume 69, Issue 4 , 2020 , Pages 1376-1386 Tarzamni, H ; Babaei, E ; Panahandeh Esmaeelnia, F ; Dehghanian, P ; Tohidi, S ; Bannae Sharifian, M. B ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    In this article, a new soft switching isolated push-pull dc-dc converter using a three-winding transformer is proposed. The proposed hybrid resonant and pulse width modulated converter employs a conventional push-pull structure in the primary side, a voltage doubler in the secondary side, and a bidirectional switch besides the transformer, altogether help offering a high efficiency over a wide range of input and output voltage signals with an unsophisticated fixed-frequency control mechanism. The primary-side switches are commutated under zero voltage switching with low switching current and the secondary-side diodes are commutated under zero current switching. In this article, we first... 

    Comprehensive analytics for reliability evaluation of conventional isolated multiswitch PWM DC-DC converters

    , Article IEEE Transactions on Power Electronics ; Volume 35, Issue 5 , 2020 , Pages 5254-5266 Tarzamni, H ; Panahandeh Esmaeelnia, F ; Fotuhi Firuzabad, M ; Tahami, F ; Tohidi, S ; Dehghanian, P ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    This article offers a holistic model and approach on reliability assessment of conventional isolated multiswitch pulsewidth modulation dc-dc (IMSDC-DC) power electronic converters with conventional half-bridge, full-bridge, and push-pull dc-dc topologies. The proposed reliability assessment analytics encapsulate correlated effects of several conditions (e.g., open- and short-circuit faults) and prevailing parameters (e.g., duty cycle, input voltage, output power, transformer turns ratio, voltage gain, switching frequency, operation time duration, and components characteristics) on the overall reliability performance of IMSDC-DC converters. Such insights are then harnessed within a Markov...