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This paper proposes the high-voltage high-frequency power supply for an ozone generator using a phase-shift pulse width modulation (PWM) full bridge inverter with constant applied electrode voltage. The circuit operation is fully described. The high-frequency transformer and ozone generator mathematical models are also included for preliminarily calculating of instantaneous voltages and currents....
This paper proposes a new diagnosis method for the eccentric load coupled to a brushless DC motor, which utilizes the amplitude of two-phase current. The experiment verifies that the Fourier analysis and the Wavelet analysis of the amplitude of two-phase current are effective. Especially, the Fourier analysis of the amplitude of two-phase current is proportional to the load torque with the coefficient...
The intake of dust and dirt-contained outside air into the motor during the cooling process causes the requirement of dismantling and clean-up operation once every three years. Besides that, high speed of acoustic noise isi produced by the cooling fan mounted on rotor at high speed. totally enclosed, airtight-type motor was developed not only to deal with the dust intake problem and thereby eliminate...
In this paper, a new SPICE-compatible behavioral model and corresponding parameter extraction procedure for single- and three-phase chokes are presented. The model takes into account common-mode and differential-mode behavior of the choke and can be applied to modeling both common-mode chokes and coupled DC chokes. The model parameters are obtained from a straightforward parameter extraction procedure...
An electrical losses (copper and iron losses) minimization control of interior permanent magnet synchronous motors is proposed in this paper. Until now a Look-up Table based maximum torque per armature current control strategy was proposed by authors. That is a control to minimize copper losses. Meanwhile, the efficiency deteriorates as a result that the iron losses increase sharply in high speed...
This paper presents an intensive discussion on conducted electromagnetic interference (EMI) emissions from an inverter-driven air conditioner. The common-mode voltages produced by the pulse-width-modulation (PWM) inverter may cause a high-frequency leakage current. The use of a spectrum analyzer and a line-impedance stabilization network (LISN) makes it possible to refer the leakage current in the...
The purpose of this paper is to investigate and implement a novel approach to learning control for permanent magnet synchronous motor (PMSM) drive system using a hybrid recurrent fuzzy neural network (HRFNN) control. First, the field-oriented mechanism is applied to formulate the dynamic equation of the PMSM servo drive. Then, a HRFNN speed control system that combined supervisor control, RFNN and...
This paper proposes a new output voltage control for inverter system which contains time-delay and nonlinear load. In the next generation X-ray CT system with the contactless power transfer method, the feedback signal often contains some long delay time by AD/DA conversion and error detection/correction time. When the PID controller of inverter system has the harmful influence on the time-delay, it...
This paper proposes the measurement of an ozone generator using a phase-shifted pulse width modulation (PWM) full bridge inverter as a power supply. The method of electrode parameter measurement for an ozone generator is presented. An electrode set is represented by an equivalent circuit by parallel capacitor and resistor. The test was performed with high-frequency high-voltage ac power supply. Then...
The Large Helical Device (LHD) is a helical-type fusion plasma experimental device using six superconducting coils to form a magnetic field. The fundamental operation of the LHD is performed under a dc magnetic field, and a power system which was suitable for steady state excitation was designed and constructed. With the progress in the fusion plasma research, dynamic experiments such as sweep of...
Neutral-Point voltage fluctuation is one of the most important issues of NPC three-level inverters. In this paper, two kinds of control region are proposed to evaluate the control effect of neutral-point voltage balancing schemes. Basing on hysteresis control strategy, the paper analyses the control region in SPWM and SVPWM respectively and finds their relationship, it also finds the relation between...
A filter design technique using numerical simulation is described and an example is given of the application of our technique for inverters compliant with European standards. We first studied noise generation mechanisms of inverters with a combined method of magnetic field and an electric circuit. We then design X-capacitor filters for category C2 of the European standard using transmission property...
Tokamak coil power supply for superconductivity coil of ITER(International Thermonuclear Experimental Reactor) requires fast dynamic performance of di/dt and smooth changeover of current direction. To meet the specification high performance this power supply is designed for 12-pulse thyristor dual converter with interphase reactor(IPR). The study about improving current control transient response...
The contribution will comment on the role of silicon carbide based power semiconductor devices in industrial electronics with a focus on high power densities and improved efficiency. Starting with an introduction into the basic properties of silicon carbide semiconductors it will be sketched how these features can be favorably used in order to minimize volumes of electronic components and/or reduce...
This paper proposes a single-pulse operation control for Matrix converters where the single-pulse operation is controlled to synchronize with the output frequency. There are two known problems for the synchronize control; firstly, the beat-frequency components occurs in the output current, and secondly, the input power factor should be controlled as unity. To solve these problems, this paper proposes...
In this paper, a low voltage high current electroplating power supply of high efficiency is described. In order to improve efficiency and thermal performance, structural design and optimization of the power supply is taken into consideration. ZVS phase-shift full bridge with synchronous rectification in output side is realized in the DC-DC part. A novel kind of power MOSFET module for synchronous...
This paper deals with a new PWM control scheme of matrix converters, which have been proposed by the authors. The PWM control scheme is characterized by the calculation algorithm using pseudo inverse and the performance that the output voltage can be controlled completely even if the input voltage is distorted. An experimental system, which consists of a matrix converter main circuit and a control...
This paper presents a novel PWM strategy of single-phase to three-phase matrix converters with a small capacitor compensating for single-phase instantaneous electric power fluctuation. The output voltage and input current references of the small capacitor to obtain unity input power factor are derived. The PWM strategy with the only four commutations of all the three phases during a control period...
A digital grid synchronization technique is needed for distributed generation system to make output current sinusoidal even if the grid voltage is distorted by harmonics. In this paper, a digital grid synchronization technique based on adaptive notch filter is proposed. The analysis of proposed technique is performed through the consideration of grid synchronization technique based on PLL and FLL...
A new circuit topology, Multi-DC Tap, in which several switching devices with anti-parallel diodes are connected in series to enable several arbitrary DC terminal voltages from a common DC link, is proposed. The control switching pattern for the Multi-DC Tap is investigated based on the direction of each terminal current and its buck/boost operation conditions. As a result, a simple strategy for switching...
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