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Phu Ho Van Quang,Thanh Tien Ha,Jong-Wook Lee Institute of Electrical and Electronics Engineers 2015 IEEE transactions on industrial electronics Vol. No.
<P>We present a fully integrated multimode lithium-ion battery charger integrated circuit (IC) for wireless power charging applications. The proposed charger IC integrates an analog block for battery charging, a digital control block, an analog-to-digital converter, and memory on a single chip. To improve the charging efficiency, the supply voltage of the charger IC is controlled by an adaptive low-dropout (LDO) regulator. A series-voltage feedback path is formed along the LDO regulator and multimode level shifter, which regulates the supply voltage to closely follow the battery voltage. For a smooth transition during multimode charging, we propose a new approach for built-in resistance compensation. The digital control block of the charger IC is designed in accordance with the Qi standard. The battery charger IC is fabricated in a one-poly six-metal 0.18-μm CMOS process. Integrated with the digital control block and memory, the core area of the multimode charger IC is 0.9 × 1.4 mm<SUP>2</SUP>. The input voltage ranges from 4.8 to 5 V. The output voltage is 4.2 V in constant-voltage mode. The charging current in constant-current mode is 450 mA. The maximum and average charging efficiencies are 83% and 79%, respectively.</P>
Seismic Fragility Assessment for A Newly Developed Buried Arch Bridge
Phu Van Dang,허정원,안진희,Achintya Haldar,곽기석 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.11
This study aims to assess the seismic response of a newly developed buried arch bridge system. The proposed buried arch bridge system is comprised of precast concrete panels, external steel outriggers, and steel V-strips to solve the limitation encountered in the storage, transportation, and construction of traditional buried arch structures. The three-dimensional finite element analysis of this arch system is conducted under dynamic analysis emphasizing the frequency content of earthquakes. Then, the fragility curves are suggested for this arch system based on two damage states defined via incremental dynamic analysis. The results show that this proposed arch system is significantly affected under a high frequency content earthquake compared to the low and intermediate ones. Additionally, the arch system deflects the most at the mid-high position rather than at the arch crown. The deflection at the arch crown or at the mid-high position can be used for establishing the fragility curves as they both connect with the failure mechanism of the arch structure.