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RISS 인기검색어
- 검색키워드
- 저자 : Yang Mingliang (검색결과 3 건)
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Zhang, Shuye,Yang, Ming,Wu, Yang,Du, Jikun,Lin, Tiesong,He, Peng,Huang, Mingliang,Paik, Kyung-Wook IEEE 2018 IEEE transactions on components, packaging, and ma Vol.8 No.3
<P>Although cationic epoxy was optimized for low-melting SnBi58 solder ACF joints with the lowest coefficient of thermal expansion (CTE) in terms of reliability, cationic epoxy also showed a faster curing property than any other types of adhesives. In fact, solder joint shapes at 250 °C bonding are very different from those shapes at 200 °C bonding. In this paper, four adhesive film types were investigated in terms of Sn-3Ag-0.5Cu solder ACF joint shapes on the electrical performances and reliability in a pressure cooker test (PCT). Thermal stability of adhesive films was tested to be first. Resin curing speeds were measured in a 250 °C isothermal mode differential scanning calorimetry, resin viscosities were checked by a parallel-plate rheometer, and adhesive thermomechanical properties, such as modulus and CTE, were characterized. Then, four different types of ACF resins containing the same weight percentages of Sn-3Ag-0.5Cu solders were assembled by the same thermocompression bonding parameter (250 °C 10s 2MPa on bump) on a 500- <TEX>$\mu \text{m}$</TEX>-pitch flex-on-board (FOB) application, and different solder joint morphologies were verified. Various bonded solder ACFs joints were compared in terms of solder wetting areas, electrical performances by a four-point-probe method, and the reliability of PCT (121 °C 100% humidity 2atm) for 120 h. This paper aims at optimizing the best adhesive film candidate for SAC305 solder ACF joints of FOB application.</P>
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Wang, Liguo,Feng, Mingliang,Tian, Zhenteng,Bai, Yang,Xu, Jianxin,Wang, Zongjie The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11
To monitor, diagnose, and suppress the inter-turn short-circuit faults (ITSCFs) of a submersible motor, an approach for the on-line identification of its winding faults has been proposed based on monitoring the stator current. First, an ITSCF model with the global leakage referred to the stator is given. With this model, the detection parameter, which is equal to the ratio of the turns of the fault windings to the total turns of the windings in the healthy phase, can be derived. Second, a faulty model described by the fourth order state-space equation of the motor with a winding fault has been given. Based on sampled stator voltage and stator current, the detection parameter has been solved and used to estimate the location and the turns of inter-turn short-circuit windings of the motor in real time. The accuracy and the robustness of the proposed approach has been illustrated with a 1.5 kW motor that is fed by a 10 kW inverter. Experiment shows that the identification accuracy in terms of the number of the ITSCF windings of the motor stator is less than 3. It can give a reference for the on-line diagnose the ITSCFs of the stator windings of a submersible motor that works in 2 km deep well.
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A Non-isolated High-gain DC/DC Converter Suitable for Fuel Cell Vehicles
Zhou Meilan,Fu Jun,Wu Xiaogang,Yang Mingliang,Zhang Zhigang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
The output voltage of the fuel cell is relatively low, which is usually lower than the DC bus voltage in the power system of electric vehicles. At the same time, the fuel cell output current and output voltage are signifi cantly inversely proportional to each other, as the output current increases, the output voltage drops signifi cantly. For the purpose of adapting the unstable output voltage characteristics., this paper proposes a non-isolated converter structure. The proposed converter has certain advantages in electrical performance, high voltage gain, low component voltage stress, wide input voltage range, and the structure that the output and input are common ground. In this paper, the working principle is analyzed. The closed-loop control system is designed by building a small-signal model. And a prototype is designed while calculating the device parameters. The experimental results show that the input range of the prototype is 25–60 V. When the rated output voltage is 200 V, the boost ratio can reach 8 times, which meets the requirements of fuel cell vehicles for DC/DC converters.
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