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We present a non-traditional CMOS inverter composed a junctionless (JL) NMOSFET and an N+-N--P transistor which with simple process and high integration density in this paper. In the non-traditional CMOS inverter the JL NMOSFET serves as driver and the N+-N--P transistor serves as load, respectively. Based on the measurement date of the N+-N--P transistor published, we draw the load line of the non-traditional...
In this paper we present a low-power and small-area balun LNA. The proposed inverter-based topology uses self-biasing and noise cancelling, yielding a very robust LNA with a low NF. Comparing this circuit with a conventional inverter-based circuit, we obtain a ~3 dB enhancement in voltage gain, with improved robustness against PVT variations. Simulations results in a 130 nm CMOS technology show a...
An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
High-power and large-depth are big problems which restrict the development of electromagnetic detection technology. One of the solutions is to provide numerous frequencies of power supply which can expand the range of the frequency. In this paper, a new control strategy of inverter based on FPGA is proposed. It can make the inverter emit multiple frequencies and deepen the detection depth. This research...
A simplified space-vector pulse width modulation (SVPWM) algorithm for back-to-back three-level converter is analyzed in this paper. Also, a novel virtual flux control strategy and a hybrid rotor flux observer are proposed in the following. These algorithms are put into used in a back-to-back mine hoist control system for induction motor. The experiment results verified the effectiveness of the algorithms...
This work describes a novel modeling and simulation approach of brushless DC motor control system depended on analysis of it's mathematical model. The brushless DC motor ontology model, the voltage type inverter circuit model, the hysteresis current tracking comparative model and the PID speed controller model were constructed in the Simulink environment of Matlab. S-function was used in modeling...
The DC current rejection of a single phase half-bridge grid-connected inverter with a line-frequency isolation transformer is researched in this paper. The impact of the magnetic dc bias of the transformer is given out from the mathematic model of the transformer in current-mode control. For the half-bridge current-mode inverter, the dc current rejection method is presented based on the relationship...
The direct-drive wind power generation system based on permanent magnet DC motor is researched, and the converter models of generator side and power network side is analyzed in detail. The system consists of a permanent magnet DC motor- generator set, a rectifier of high power factor, a boost converter and a full power inverter. The practical wind speed is simulated by the change of motor speed which...
Firstly, it introduces the different operating modes and control mechanism of the high-voltage DC transmission (HVDC) system and analyzes the fuzzy control theory. On this basis, using MATLAB, a typical 12-pulse HVDC transmission system model of the bridge has been simulated under the control of traditional PI and fuzzy intelligent respectively. Compared with the traditional control methods, the real-time...
Based on the mathematic model of single-phase voltage source inverter, an adaptive control method which can deal with unknown parameters and guarantee stable of the control system is systematically proposed in the paper. According to Lyapunov stability theory, an adaptive state observer is used to estimate variables adopted in the control law. Meanwhile, A 3rd order filter is used to deal with the...
To make an analysis on the output exists oscillation of inverter Fuzzy control system, this paper focuses on the digital signal processor (DSP), brings variable universe into Fuzzy self-tuning PID control structure, and put forward a Fuzzy self-tuning PI double closed loop inverter controller based on variable universe, so as to achieve an online adaptive stretching changes of Fuzzy universe. The...
A new asymmetrical hybrid multilevel inverter topology is presented. The new topology improve the number of the output voltage level greatly through cascading two five-level H-bridge cells. A hybrid PWM strategy is proposed for the new topology that the switches of different cells works in different switching frequency to low switching losses. Lastly, an experimental 17-level asymmetrical inverter...
In this paper is presented the structure and working principle of the cascaded H-bridge multilevel converter with PWM rectifier and phase-shift transformer. Using the leak inductance as the filter reactor of the PWM rectifier can reducing the volume and cost of the converter; the phase-shift secondary side of the transformer can eliminate the current harmonics caused by the single power unit, restraining...
This assay supposed one kind of asymmetrical multi-level inverter that based on the topology of cells cascading, every cell in this inverter is composed of one two-levels inverter series with several three-levels H bridges, the controlling system is constructed by DSP and FPGA. This article described the topology of this inverter and its controlling methods in detail. In final, tested this inverter's...
The full regeneration of the braking energy is one of the most promising sources of energy savings to transport system operators. This paper presents the outcome of a RailEnergy cooperative research program focusing on reduction of energy consumption in transport systems. Today, urban transportation systems are generally fed at 750 Vdc or 1,500Vdc via rectifier bridges and trains are equipped with...
The saving energy with train operation is more important than before from the view points of the global environment. However the energy saving design on the traction equipments sometimes has a trade off relation against the down sized and lighter weight traction equipments. In this paper, an optimizing method of the generic algorithm is applied to the numerical simulation to calculate the consuming...
A fuel cell based traction drive and its control are presented. Dual cascaded voltage source inverter and supercapacitor bank allow to increase performances and efficiency. The proposed control allows to optimize the power flow from the two sources in whatever operating condition. Because the supercapacitor system cannot be normally recharged completely in case of asymmetric duty cycle of the vehicle,...
A simple but powerful design method based on real-coded Genetic algorithms (GAs) to solve the minimization of the Total Harmonic Distortion (THD) criterion is obtained. GAs provides a much simpler approach to off-line tuning of Pulse width Modulation (PWM) switching angles than the rather complicated non-genetic optimization algorithms. Genetic algorithms are exploratory search and optimization procedures...
There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies. This paper presents a single-phase five-level grid connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the rectified inverted sine carrier signal...
A decentralized controller for the synchronization of two remote parallel voltage source inverters used to supply train auxiliaries is presented. A modular hybrid dynamic model of the entire power electronic apparatus is constructed; possible unbalanced line and load impedances are also considered. The power sharing between the converters is obtained by designing a droop controller based on local...
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