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The linear switched reluctance machine (LSRM) has the merits of low cost, simple structure and mechanical robustness [1]. It is one of the most promising candidates in the direct-drive applications such as linear transportation and position control systems [2-3]. However, they are limited to some special use due to their inherently low propulsion force output and high force ripples, especially in...
The internal parasitic bipolar transistor plays an important role in the unclamped inductive switching (UIS) failure of superjunction MOSFET. To suppress the activation of parasitic transistor, an innovative structure was proposed which features a P-island with relatively high doping concentration at the top of P-column and a trench-type P+ contact. The avalanche point is localized at the P-island...
In this work, bamboo-shaped CNTs were successfully fabricated by PECVD using ZnO:Co thin film as catalyst. ZnO:Co nanoclusters were produced by a nanocluster-beam deposition system. Briefly, a metal target consisting of 98% Zn and 2% Co was used with a sputtering power of 130 W. Ar, He and Oxygen gases were injected into the system with the corresponding total pressure of 0.75 Torr. A plasma enhanced...
The clinical target of this study is intrauterine patch coverage of fetal myelomeningocele. We propose a new surgical robotic system for intrauterine fetal surgery with patch-stabilizer and laser manipulator. The target disease of the fetal surgery is spina bifida or myelomeningocele, which is incomplete closure in the spinal column and one of the common fetal diseases. In the fetal surgery, the collagen...
An ultra-wideband (UWB) band-stop filter (BSF) is presented using novel design to tune the resonant frequency by micro-electromechanical systems' (MEMS) switch, based on electromagnetic band-gap (EBG) and coplanar-waveguide (CPW) structures. The model of the compact BSF is cascaded by three EBG resonators. The BSF is operated from 15 to 20 GHz with good stop rejection and sharp roll off frequency...
Z-Source inverter is a single-stage power converter capable of either stepping down or stepping up the input dc voltage while converting it to ac form. However, due to the presence of a diode in series with the input source, the power flow is limited to one direction, i.e. from the dc source to the ac side. However, for some energy storage applications such as ultracapacitor banks, battery banks etc...
Unlike the traditional trimming techniques, such as fuse, laser and E2PROM trimming, an iterative scheme based on the digital trimming is adopted for improving the static and the dynamic parameters of the ADC device in this paper. This trimming technique is able to adjust the reference voltage, the common-mode voltage, and the current by changing the topology of the capacity or resistor array with...
Based on the analysis of constant frequency, periodical frequency-spreading scheme and chaotic frequency-spreading scheme, the article has discussed the mechanics and the characters of the chaotic PWM suppressing EMI in the converter. Experiments have been made on an AC-DC forward converter. The experiment results show that the EMI spectrum is decided completely by the PWM spectrum, and the chaotic...
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