scholarly journals A THREE-PHASE HIGH POWER FACTOR TWO-SWITCH BUCKTYPE CONVERTER

2014 ◽  
pp. 38-44
Author(s):  
SEEMA V. ◽  
PRADEEP RAO. J
Keyword(s):  
High Power ◽  
Buck Converter ◽  
Phase Voltage ◽  
Peak Voltage ◽  
Line Voltage ◽  
Switching Losses ◽  
High Power Factor ◽  
Three Phase ◽  
Voltage Stress ◽  
Peak Value

The paper proposes a three phase, two switch buck type converter with high power factor.The key feature of the proposed converter is that a switch in the converter has a lower peak voltage stress than a switch in a conventional threephase, single-switch buck-converter. A switch in the converter sees a line to neutral voltage across it rather than a line to line voltage which is the case for the switch in the conventional converter. The voltage stress in the proposed converter is limited to the peak value of the phase voltage of the input capacitors rather than the peak value of the line-to-line voltage, as is the case in the conventional converter. Since a switch in the proposed converter sees a line to neutral voltage instead of a line to line voltage the peak voltage stress is almost half than that of the switch in the conventional converter as this stress is reduced by a factor of sqrt(3). This reduces switching losses and allows lower rated standard devices to be used in converters. In the paper, the operation of the proposed converter is given and general considerations that should be taken into account when trying to design it are discussed. The feasibility of the converter is confirmed with results obtained from computer simulation and from an experimental prototype.

Prediction of a New Cascaded Hybrid Multilevel Inverter with Less Device Count

2016 ◽  
Vol 1 (2) ◽  
pp. 273
Author(s):  
C.R. Balamurugan ◽  
S.P. Natarajan ◽  
R. Bensraj
Keyword(s):  
Output Voltage ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Phase Voltage ◽  
Power Devices ◽  
Line Voltage ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Voltage Stress ◽  
Low Distortion

<p>Multilevel inverters have been opted for high power applications due to reduced harmonic distortion, less device voltage stress and modular structure. This work proposes new modified hybrid H-bridge multilevel inverter using auxiliary switch. This proposed inverter produces five levels output with five power devices and clamping diodes as a phase voltage and nine levels as a line voltage.The levels of the inverters are decided based on the phase voltage not on the line voltage. In this paper the performance of the proposed inverter are measured in terms of line voltage. However, by increase in the number of levels the proposed inverter with reduced number of switches produces low switching losses and improves the efficiency of the inverter. This method achieves the variation of Total Harmonic Distortion (THD) in the inverter and output voltage is observed for various modulation indices. Simulation is performed using MATLAB-SIMULINK for line to line output voltage. Variable Amplitude Phase Disposition (VAPD) strategy provides output with relatively low distortion for all the strategies. It is also seen that VAPOD is found to perform better for all strategies since it provides relatively higher fundamental RMS output voltage.</p>

scholarly journals A Novel Hydro Powered Online Power Converter for Marine Lighting Applications

2018 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Sinu KJ ◽  
G. Ranganathan
Keyword(s):  
Power Factor ◽  
High Power ◽  
Mechanical Energy ◽  
Synchronous Generator ◽  
Voltage Regulation ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Losses ◽  
High Power Factor ◽  
In Series

<p>This paper presents a new hydro energy based dc-dc PFC sepic based buck converter for marine lighting applications. The major advantage of the proposed power converter is high power factor and low THD with higher efficiency. SEPIC converter produces continuous smooth ripple free current because of two inductors in series in line in its circuit. Sepic converter produces lower switching losses because of lower voltage stress on power switch employed compared to other buck-boost converter topologies. Tidal wave energy is converted into mechanical energy with the help of a hydro turbine which drives a permanent magnet synchronous generator to produce three phase ac output voltage. It produces a low ac voltage which is converted into DC using passive diode rectifier and fed to sepic converter for voltage regulation as well as to improve quality of power supply such as high power factor, low THD. The proposed sepic based power converter for marine lighting application is simulated in MATLAB/Simulink environment for verifying the performance of proposed scheme.</p>

scholarly journals On the Development of High Power DC-DC Step-Down Converter with Energy Recovery Snubber

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Alok Singh ◽  
Mangesh B. Borage ◽  
Sunil R. Tiwari ◽  
A. C. Thakurta
Keyword(s):  
High Power ◽  
Energy Recovery ◽  
Design Procedure ◽  
Power Converter ◽  
Buck Converter ◽  
Dual Function ◽  
Turn On ◽  
Switching Losses ◽  
Voltage Stress ◽  
Diode Voltage

The effect of switching losses on the efficiency of a switch mode power converter and methods adopted for its improvement using an energy recovery lossless snubber has been presented. A comparative analysis of various types of soft switching techniques along with effects of dissipative and nondissipative snubbers on efficiency of the converter has been carried out before zeroing in on the selected scheme. The selected snubber serves the dual function of a turn-on and turn-off snubber and thereby reducing the switching losses both during turn-on and turn-off transients, resulting in improved efficiency of the converter. A detailed design procedure of the snubber for high-power applications taking into account various effects such as diode reverse recovery, diode voltage stress, and minimum and maximum duty cycle limits, has been presented in this paper. Importance of practical aspects in layout to minimize wiring inductance is also highlighted. A high-power prototype of buck converter has been developed to experimentally validate the theoretical design and analytical observations.

A Three-Phase Reduced-Switch High-Power-Factor Buck-Type Converter

2010 ◽  
Vol 25 (11) ◽  
pp. 2772-2785 ◽  
Author(s):  
Sondeep K. Bassan ◽  
Dunisha S. Wijeratne ◽  
Gerry Moschopoulos
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Power Factor ◽  
Three Phase

Design of Three-phase High Power Factor Correction Rectifier in Space AC-DC Energy System

2020 ◽  
Author(s):  
Dong Ma ◽  
Yang Li ◽  
Yang Jin ◽  
Dongdong Zhang ◽  
Chunyu Wu ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
Power Factor Correction ◽  
Energy System ◽  
High Power Factor ◽  
Three Phase
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