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A new three-phase single-stage rectifier is proposed in this paper. The proposed converter is a multilevel converter and its switches have less peak voltage stress than the switches of previously proposed two-level topologies. In this paper, the operation of the new converter is explained, its features and design are discussed, and its feasibility is confirmed with experimental results obtained from...
This paper deals with the analysis, design and control of a three-level 24-pulse Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) system. A three level VSC operating at fundamental frequency switching (FFS) is proposed with 24-pulse VSC structure to improve the power quality and reduce the converter switching losses for high power applications. The design of three-level VSC...
This paper presents a novel modulation technique for a multilevel hybrid converter. This technique is based on a finite state machine which decodes the comparison between the reference signal and four level shifted carriers arranged in phase. The objective of this state machine is to achieve a appropriate alternation between redundant states in order to naturally balance the converter floating capacitors...
This paper presents a three-phase electric drive with a modified electronic smoothing inductor (MESI) having reduced size of passive components. The classical electronic smoothing inductor (ESI) is able to control a diode bridge output current and also reduce not only mains current harmonics but also output voltage ripple. ESI performs the function of an inductor that has controlled variable impedance...
To increase the voltage levels and reduce the harmonics feedback to the input source in high voltage high power application, this paper proposed one novel multilevel back to back AC-DC-AC converter. Firstly, the topology about this six level converter is introduced, which realize the neutral clamped points only by switches, and is attractive for its economy. The relationship between the multilevel...
An AC-DC converter is designed for supplying light-load digital circuits in a biomedical implant. When the AC input is just above the DC output (VDCo), a boosted switch is turned on and then turned off according to the load current by controlling the switch timing via a feedback loop. A power efficiency of 93.8% is achieved with a 3.5 V peak AC input, VDCo = 2 V, and an output power of 10 mW.
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input applications...
A bridgeless, two-inductor, interleaved Boost converter that possess voltage-doubler characteristic when it operates with a duty cycle greater than 0.5 for power factor pre-regulator is proposed in this paper. The conduction losses of the boost switches are reduced because at low line the converter operates in the voltage-doubler mode for almost the entire line period, which reduces the rms currents...
It is talked, the rule of voltage converter control, which is used to introducing of added voltage, in this article. It is given procedure of switching converter rectifiers to hold received voltage comes from controller how most approximate to set voltage.
This paper proposes a new circuit topology for a multilevel PWM rectifier. The proposed circuit combines a diode clamp type topology with a flying capacitor type topology. As a result, the proposed circuit uses only 12 switches, despite the use of a five-level three-phase PWM rectifier. Further, the proposed circuit can obtain good performance as same as to a conventional multilevel circuit. This...
To draw a sinusoidal line current and to achieve high power factor and low voltage stress of power switches, Some single-phase three-level switching mode unidirectional rectifiers with power diodes have been presented. But there is an inherited disadvantage of imbalance of the DC-link voltage, which is difficult to be solved only by control method. A novel three-level rectifier with asymmetrical legs...
Recently cascade multilevel converters have attracted the attention of researchers for medium voltage applications such as FACTs devices and motor drives. This topology consists of several H-bridge cells in series, which has the advantages of modular structure and reduced number of components. The main challenges in these applications are limitation of switching frequency of semiconductor devices,...
This paper proposes novel high input power factor single-stage single-phase AC/AC converter to give high input power factor and low current distortion on the rectifier side and provide clean and stable AC voltage on the inverter side. The proposed AC/AC converter can not only provide regulation of the output AC voltage magnitude but provide variable output AC voltage frequency. A significant reduction...
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