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In recent years, the use of non-conventional renewable energies, particularly photovoltaic solar energy, has been growing steadily in the country and is currently a real alternative to collaborate in the production of energy required by the national industry. Motivated by the above is that the study and development of technology in Chile for this energy opportunity is fundamental at the present time...
Induction motor loss segregation and efficiency measurement requires loading dynamometers and other equipment such as a variable voltage sinusoidal power supply. These are expensive and not often available even when a loading device is accessible. Variable frequency drives are now widely used for operating induction machines and are more widely available and less expensive. However, their use in place...
The use of gallium nitride (GaN) high-electron mobility transistors (HEMTs) is a promising solution for a highly efficient motor drive design due to their high-switching speed and low on-state resistance. However, the higher reverse voltage drop of GaN HEMTs than that of the conventional silicon (Si) devices generates significant reverse conduction loss during the freewheeling period. This phenomenon...
The authors have proposed the single-stage bidirectional buck AC/DC converter. This paper presents comparison of loss and volume between the proposed single-stage buck AC/DC converter and the conventional two-stage AC/DC converter. The effectiveness of the proposed single-stage buck AC/DC converter is verified by experiments.
Interleaved switching of parallel inverters has previously been proposed for efficiency/size improvements of grid connected three-phase inverters. This paper proposes a novel interleaving method which practically eliminates insulated gate bipolar transistor (IGBT) turn-on losses and drastically reduces diode reverse recovery losses. The reduction in switching losses are obtained by interleaving two...
Renew able energy sources have gained momentum in the current trends of effective power generation to overcome global warming due to the pollution caused by existing power generating system. The renewable power will also meet the future demand when existing fuel will be exhausted. Solar power is considerably preferred on account of its easy availability all year round. In this paper, a very efficient...
In this paper, the conventional three-level diode-neutral-point-clamping (3L-DNPC) inverter is deeply investigated from the view of power loss. It is concluded that the conventional 3L-DNPC inverter has high zero-vector conduction loss due to clamping Diode+ IGBT structure's high on-state voltage, high clamping diode reverse recovery loss and so on. Therefore, the clamping diodes are most deeply related...
This paper presents an experimental study of the relationship between performance and total harmonic distortion (THD) in cascaded H-bridges multilevel power converters. The aim of the study is to determine the existence of a relation between the decrease of the output voltage THD and the reduction of the converter performance. In the work, a three-phase H-bridge cascaded multilevel converter is implemented...
This paper deals with the configuration of a simple Solar Panel and proposes a few methods to maximize the efficiency of the Photovoltaic Panel using microcontroller chip. Additionally, through the case study of an Educational Institution with a Solar Plant, this paper attempts to explain its benefits and efficiency. With the help of observations on the case-study Solar Plant of the Institute, a suitable...
Losses due to pulse width modulated (PWM) supplies may play an important role in the efficiency of some of the electrical machines used in renewable energy systems due to variable working conditions. In this work, experimental measurements on a test bench, and a special procedure for the separation of PWM magnetic losses, are used to study the effect of the two main PWM supply parameters (modulation...
Converter losses can be reduced by use of new components like SiC or GaN, but unfortunately they come with prohibitive prices. Another way of reducing losses is employing PWM clamping techniques. The method proposed in this work is based on PWM clamping following the maximum current for reducing the switching losses of the converter. The simulation and laboratory tests are showing a relative power...
This paper proposed a modular multilevel topology using power electronics transformers for the modular drivetrain of electric vehicles (EV). Because of its high modularity, the topology can be easily applied to a wide range of EVs, from personal vehicles to passenger cars. Compared with two conventional modular multilevel converters, fewer submodules are needed and its control is thus simpler. The...
The efficiency impact of air-cored inductors used close to and beyond its cut-off frequency in multi-MHz converters is investigated. A method is presented to determine the converter switching frequency that causes the lowest losses in a given inductor. Influential parameters are analysed to optimize an inductor for a predefined switching frequency.
A methodology to measure and to demonstrate the impact of the PWM duty cycle jitter on the power conversion efficiency is proposed. The equivalent circuit model with corresponding equations is developed to determine the power loss mechanism. An automatic measurement system without thermal drift is established to verify the converter's efficiency drop.
This paper is focused on the analysis of the cascode connection of Superjunction MOSFETs (SJ-FET) working as a high voltage normally-off power switch, based on Silicon technologies. In order to carry out this analysis, it will compare the cascode structure with the standalone connection, in which only one SJ-FET is used. The comparison is carried out in terms of switching behaviour, in order to verify...
We demonstrate at designing Delta-Sigma Modulator controlled switch-mode power supplies by considering advantage of its noise-shaping properties to eliminate the spikes present in switching power supplies. A comparative analysis between conventional Pulse Width Modulation (PWM) controller and this approach is also done. The work begins with the Designing of DC-DC Buck Converter to convert 5V input...
Various soft switching inverter topologies have been reported in the literature with the aims of reducing the switching losses and dynamic switching stress. However, lower losses are generally regarded as one of the most significant advantages of the emerging silicon carbide semiconductor devices over the conventional silicon devices. Both routes seem viable to improve the converter efficiency. To...
It is well known that power factor correction (PFC) circuits suffer from two fundamentally different operating modes over a given AC input cycle. These two modes, continuous conduction mode (CCM) and discontinuous conduction mode (DCM), have very different frequency-response characteristics that can make control design for PFC circuits challenging. The problem is exacerbated by attempts to improve...
A novel zero-voltage switching (ZVS) converter is studied in this paper. The proposed converter consists a three-level converter and a LLC converter with same active switches to have wide ZVS load range and to reduce conduction losses at freewheeling interval. Series resonant converter with fixed switching frequency is adopted to improve ZVS load range of lagging-leg switches. The primary current...
This paper presents an AC-AC Buck converter in which a modulation technique was applied in order to reduce losses due to dissipative snubbers. Theoretical analysis and numerical simulation were performed. A 100W prototype was built and tested. Efficiency curves show that snubber losses are minimized with the use of a simple open-loop control technique.
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