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Dependence of the potential barrier height φB on the biased voltages of static induction thyristors (SITh) is studied by using the numerical simulator SG-framework, concentrating on the forward blocking state, and an exponential relationship is presented through a normalized approach. The I–V characterize is of SITh is calculated by simulation and explained by potential barrier height. The cathode...
This paper presents a scalable electrical model for high-voltage laterally-diffused metal oxide semiconductor field effect transistor (HV-LDMOS) to determine the I–V characteristics, which can be used in SPICE simulators. This scalable model is represented as a hybrid model by computing its transfer function to enable its wide use in testing high-voltage devices. The scalable model has been validated...
Silicon carbide(SiC) power devices have been developed and they are sold in markets. Many papers have dealt with inverter circuits that use SiC power devices to improving efficiency and realize high power density converters. However, the power converters that use SiC power devices have not become commercially available, because the reliability of the SiC-MOSFET under switching-operation has not been...
Due to the low current ratings of the currently available silicon carbide (SiC) switches they cannot be employed in high-power converters. Thus, it is necessary to parallel-connect several switches in order to reach higher current ratings. This paper presents an investigation of parallel-connected normally-on SiC junction field effect transistors. There are four crucial parameters affecting the effectiveness...
Today, there is an increasing demand for high frequency, high power and high temperature applications where the converters will operate in a harsh environment. Switching devices based on Silicon Carbide (SiC) offer a significant performance improvement on the switch level compared with Si devices. This paper describes the current state of the art in SiC devices briefly. Then the research and development...
A novel predictive current control for a sparse matrix converter is presented. The sparse matrix converter is functionally-equivalent to the standard matrix converter but has a reduced number of switches. The predictive current control uses a model of the system to predict the future value of load current and generates the reference voltage vector that minimizes a given cost function so that SVM(Space...
P-type 12-pulse auto-transformer rectifier unit (ATRU) is a very attractive harmonic solution in aviation situation for its lower volt-ampere rating of transformer compared with other multi-pulse methods. However, the input current THD of 12-pulse ATRU is about 15% larger than 10% THD requirement by the related standards. Current-injection method is an effective harmonic mitigation method for 12-pulse...
This paper presents a new hysteresis current regulation strategy for a three-phase three-level flying capacitor multilevel inverter, that uses the zero-crossing of the averaged phase leg output voltages to select the switched output level for each inverter phase leg. Consequently each phase leg requires only one hysteresis comparator to generate its switching signals, which significantly improves...
Matrix converter is a hot spot in the field of power conversion owing to its importance in theory and applications. However, due to the lack of intermediate energy storage elements, the output voltages are easily influenced by the disturbances of the system. Many efforts have been made to cope with this problem to maintain the output sinusoidal, but the implementations of these methods are still the...
Ultrasonic motors (USM) are new type actuators that exhibit merits such as simple structure, high torque at low speed, compact size, quick response, quiet operation, self-locking when power off, no electromagnetic radiation and higher position accuracy. In the previous study, the authors proposed a new type USM using bending vibration mode. In that new design, elliptical trajectory vibrations are...
The paper proposed a new adaptive controller design for a synchronous reluctance motor drive system. In this paper, an on-line tuning adaptive controller is proposed. This on-line adaptive controller is based on least-mean-square algorithm. The adaptive controller is constructed by using an adaptive model and an adaptive control. The parameters of both the adaptive model and adaptive control are on-line...
In a previous study, the authors have proposed, designed and fabricated a cylindrical traveling wave piezoelectric motor excited by a longitudinal and bending hybrid composite transducer. This study focuses the research on the vibration coupling problems of the proposed stator. After the introduction of the working principle of the motor, harmonic analysis is developed to gain the input impedance...
To select the optimal blade number of Francis turbine in small hydropower station, four typical conditions are chosen to computed for full flow of turbine based on Computational Fluid Dynamics (CFD). The 3-D flow field and stresses of a Francis turbine and the fluid-structure interaction are studied by model analysis. The results demonstrate that when the blades of the runner increases to 15 or decreases...
This paper proposes a novel Continuously Adjustable Magnetic-valve Controllable Reactor (CAMCR), which can avoid the control “blind area” of conventional Magnetic-valve Controllable Reactor (MCR) and reduce the output harmonics of MCR. There are circular truncated cones in the iron cores of CAMCR. Each section of core saturates at different time and creates current harmonics in different phases, i...
This paper proposes the application of frequency locked loop (FLL) based Kalman filter (KF) technique for frequency adaptive instantaneous power quality (PQ) analysis. In the proposed technique, the FLL is integrated with the linear Kalman filter (LKF) to estimate the time-varying grid fundamental frequency. The LKF is used to estimate the orthogonal waveforms of fundamental and harmonics components...
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