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This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and SiC-SBD. The static and dynamic characteristics were evaluated and the turn-on loss is 38% lower and the reverse recovery loss is 83% lower than the conventional all-Si IGBT module because of the reverse recovery current of SiC-SBD is very small to be an unipolar device. The radiation noise on hybrid...
This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common mode (CM) conducting path to the inverter. The...
This paper presents the fabrication of a through-glass-via (TGV) substrate with an integrated high-g MEMS shock threshold sensor on it, which will minimize the die size of the whole sensor, avoid lead-wire bonding and facilitate the surface mount. Moreover, smaller volume could also improve the anti-shock capability of the sensor. The TGV substrate is fabricated by developed composite-mask powder...
This paper reports the design and implementation of a laboratory scale DC microgrid system that optimizes the overall fuel efficiency of multiple generators of possibly different performance characteristics through a combination of high efficiency custom-built AC/DC converters, integrated battery storage for load smoothing and a control system for the management of critical and non-critical loads.
This paper presents a fully-integrated 16-channel wireless neural interfacing SoC that employs an adiabatic stimulator powered directly from a 190-MHz on-chip antenna to eliminate bulky external components while simultaneously avoiding rectifier and regulator losses. Using a charge replenishing architecture, the stimulator outputs up to 145-μA, while achieving a 63.1% charge replenishing ratio and...
In this paper, a new model has been proposed for the design of inertial micro-switch. Compared with the traditional model consisted by movable-fixed electrode, the electrodes are designed as two movable springs. The dynamic response processes of electrodes can be controlled via the structure parameters. The simulation results indicated that the elastic contact can effectively prolong the holding time...
This work reports a new approach called optically-induced cell fusion (OICF) which integrates cell-pairing microstructures and an optically-induced system to achieve cell fusion with high yields and efficiency. It is the first time in literature that cell-pairing SU8 microstructures were combined with optically-induced “virtual” electrodes to form the OICF system such that precise cell-pairing and...
Two integrated passive device (IPD) structures are proposed in this paper. The first structure is a differential symmetrical through-silicon via (TSV) monolithic transformer that exhibited optimal symmetry between the two ends of the primary and secondary coils, enabling the operation of a differential circuit. The second structure is a fully 3-D symmetrical TSV monolithic transformer that differs...
Bearingless switched reluctance motor (SRM) has been a hot research topic for recent years. As the suspending force is important to bearingless SRM, optimization of suspending force for novel permanent magnet biased bearingless SRM is proposed in this paper. To get a better force performance, the permanent magnet's parameters (the physical dimensions) and some other parameters of the proposed motor...
Z-type hexaferrite Sr3Co2Fe24O41 (SCFO) has been reported to exhibit the room temperature mag-netoelectric effect with a very high magnetoelectric susceptibility compared with other reported single phase materials [1-3]. The reported studies on the SCFO are focused on its magnetoelectric coupling and high frequency magnetic properties. A systematical understanding on the high frequency electrical...
With the volume of induction motor in ship domain for driving application's increasing, the thermal load needs such bigger than ever before that electric machines are experiencing higher temperature which can affect performance and life expectancy in small room. The efficiency cooling system[1] is essential to keep induction motor operating regularly. The Y2-250M-455kW fan-cooled induction motor is...
Heat assisted magnetic recording is the most promising technology for high density recording. Due to thermal diffusion of the media, its density potential is limited for continuous wave laser heating. Short pulse laser heating can greatly increase the density potential [1-3]. This heating strategy also leads to a low transducer temperature increase [4]. Therefore, short pulse laser heating is a must...
In the case of III-V dilute magnetic semiconductors (DMS), the holes from Mn doping are known to mediate the ferromagnetic interaction among the Mn ions. Through modulation of the hole density, electrostatic gating has been shown to significantly alter the magnetic properties of (III, Mn)V films[1-3]. Here we demonstrate the manipulation of the magnetism of DMS (Ga, Mn)As. Mn-doped GaAs thin films...
In the high speed industrial application, bearingless motor, which integrates advantages of magnetic bearing into motor, has received more and more attention.[1-2] In this paper, stiffness analysis for one novel bearingless SRM with bias permanent magnet is investigated. Fig.1 shows the basic structure and prototype motor. It's a radial suspending structure equipped with permanent magnet to provide...
Switched Reluctance Motor (SRM) has good performance under special environments such as fault tolerance, robustness, tolerance of high temperature or in intense temperature variations. In the meanwhile, SRM has a good feature as magnetic bearing due to the inherent magnetic attraction radial force between rotor and stator poles[1]. This radial force can suspend the rotor. The bearing-less SRM combines...
Due to inclement weather in recent years, the short-circuit fault cannot be ruled out in a short time on power system, and this make the transformer as the main components of the system will withstand the impact of two consecutive short-circuit current in a short time, which makes the winding disks in the initial short circuit without damage, its residual deformation and vibration situation can meet...
In this paper, we investigate the switching property of perpendicular media in microwave-assisted magnetic recording by utilizing micromagnetic modeling, in which circularly polarized magnetic field at microwave frequencies is applied. This paper presents understanding of the switching dependence on the inter-granular exchange coupling field and the distribution of anisotropy field. The result shows...
Thermal fluctuation plays an important role in magnetic recording system and it has to be seriously considered when designing recording media and hard disk drive (HDD) system. Unfortunately, it is impossible to perform several-year-lasting thermal stress tests to measure thermal stability during the design cycles of HDD products. Usually, the long term thermal stability was predicted by fitting the...
Eccentricity fault is the condition that the air gap between the stator and rotor is nonuniform, which can deteriorate performances of motors and cause stator to rub rotor and damage the stator winding and the core [1]. To avoid accidental and unpredictable shutdown of machines and reduce financial loss, it is indispensable to detect eccentricity faults at their inception. Monitoring eccentricity...
Due to significant application in medical treatment, magnetic record and cryogenic magneto-refrigeration, a great amount of researches on ferromagnetic nanoparticles were executed [1]. With decrease of the scale of ferromagnetic material, the magnetic order and magnetization gradually decrease and such decrease is attributed to the increasing surface disorder or surface spin canting. However, for...
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