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.

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.

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>

A Simple Energy Recovery Circuit for High-Power Inverters With Complete Turn-On and Turn-Off Snubbers

2004 ◽  
Vol 51 (1) ◽  
pp. 81-88 ◽  
Author(s):  
X. He ◽  
Y. Deng ◽  
B.W. Williams ◽  
S.J. Finney ◽  
Z. Qian
Keyword(s):  
High Power ◽  
Energy Recovery ◽  
Turn On ◽  
Power Inverters

scholarly journals Design and implementation of multilevel non-isolated DC-DC converter for variable DC voltage source

2021 ◽  
Vol 12 (2) ◽  
pp. 994
Author(s):  
Ali Ahmed Adam Ismail ◽  
A. Elnady
Keyword(s):  
Power Converter ◽  
Buck Converter ◽  
Voltage Source ◽  
Stable Operation ◽  
Multilevel Converter ◽  
Medium Voltage ◽  
Voltage Stress ◽  
Filter Size ◽  
Converter Topology ◽  
Lc Filter

<span lang="EN-US">In this paper, a non-isolated multi-level DC-DC (MLDC-DC) smooth buck converter with the LC filter is designed and analyzed. The presented topology can be used in low or medium voltage levels in several applications that use DC storage elements. The use of the proposed multilevel converter topology reduces the voltage stress across the power converter switching elements and facilitates the voltage rating of the switches. The designed LC filter for the multilevel converter is characterized by a small inductor size, which reduces the traditional bulky inductor used in the output of the traditional DC-DC converter. The reduction in the filter size is proportional to the number of the connected voltage sources, it works effectively to reduce ripple in the load currents, and it increases the voltage gain. The intensive analysis of the converter system and the experimental results show a stable operation of the proposed converter with precise output voltage.</span>

scholarly journals Simulation-Assisted Design Process of a 22 kW Wireless Power Transfer System Using Three-Phase Coil Coupling for EVs

2021 ◽  
Vol 13 (21) ◽  
pp. 12257
Author(s):  
Chia-Hsuan Wu ◽  
Ching-Ming Lai ◽  
Tomokazu Mishima ◽  
Zheng-Bo Liang
Keyword(s):  
High Power ◽  
Coupling Coefficient ◽  
High Efficiency ◽  
Design Procedure ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Air Gap ◽  
Power Transfer ◽  
Wireless Power ◽  
Three Phase

The objective of this paper is to study a 22 kW high-power wireless power transfer (WPT) system for battery charging in electric vehicles (EVs). The proposed WPT system consists of a three-phase half-bridge LC–LC (i.e., primary LC/secondary LC) resonant power converter and a three-phase sandwich wound coil set (transmitter, Tx; receiver, Rx). To transfer power effectively with a 250 mm air gap, the WPT system uses three-phase, sandwich-wound Tx/Rx coils to minimize the magnetic flux leakage effect and increase the power transfer efficiency (PTE). Furthermore, the relationship of the coupling coefficient between the Tx/Rx coils is complicated, as the coupling coefficient is not only dominated by the coupling strength of the primary and secondary sides but also relates to the primary or secondary three-phase magnetic coupling effects. In order to analyze the proposed three-phase WPT system, a detailed equivalent circuit model is derived for a better understanding. To give a design reference, a novel coil design method that can achieve high conversion efficiency for a high-power WPT system was developed based on a simulation-assisted design procedure. A pair of magnetically coupled Tx and Rx coils and the circuit parameters of the three-phase half-bridge LC–LC resonant converter for a 22 kW WPT system are adjusted through PSIM and CST STUDIO SUITE™ simulation to execute the derivation of the design formulas. Finally, the system achieved a PTE of 93.47% at an 85 kHz operating frequency with a 170 mm air gap between the coils. The results verify the feasibility of a simulation-assisted design in which the developed coils can comply with a high-power and high-efficiency WPT system in addition to a size reduction.

scholarly journals Realization of a Photovoltaic Fed Sparse Alternating Current (AC)-Link Inverter

2016 ◽  
Vol 13 (2) ◽  
pp. 149
Author(s):  
R. Ramaprabha ◽  
G. Ramya ◽  
U. Ashwini ◽  
A.H. Fathima Humaira
Keyword(s):  
Pulse Width Modulation ◽  
Alternating Current ◽  
Lower Number ◽  
Turn On ◽  
Switching Losses ◽  
Voltage Stress ◽  
Inverter Topology ◽  
Zero Voltage ◽  
Series Inductor ◽  
Original Configuration

 In this paper, a soft-switched alternating current (AC)-link buck-boost inverter with a reduced number of switches, referred to as a sparse AC-link buck-boost inverter, was designed and implemented for a photovoltaic (PV) interface. Important features of the sparse configuration included a lower number of switches, lower failure rates, compactness, and cost-effectiveness. The link was composed of a low reactive rating series inductor/capacitor pair. Significant merits of the AC-link buck-boost inverter are a zero voltage turn on and a soft turn off of the switches, resulting in minimum voltage stress on the switches and negligible switching losses. In this paper, 10 switches were used instead of 20 switches as are used in existing buck-boost inverter topology. The reduction in the number of switches did not change the principle of operation of the sparse configuration; hence, it remains the same as that of the original configuration. The pulse width modulation (PWM) technique was used for gating the switches. The inverter operation was validated and implemented for PV interface using a microcontroller. 

scholarly journals Design of LQR controller for GaN based Buck converter

2020 ◽  
Vol 15 (2) ◽  
pp. 37-48
Author(s):  
Miklos Csizmadia ◽  
Miklos Kuczmann
Keyword(s):  
State Feedback ◽  
Design Procedure ◽  
Linear Quadratic Regulator ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Frequency ◽  
Linear Quadratic ◽  
Calculating Method ◽  
High Switching Frequency ◽  
Lqr Controller

Abstract:This paper presents a design procedure of a switched-mode power converter, the well-known synchronous buck converter: the calculating method, and how to choose the parts of the converter are presented in detail, like the inductor, the capacitor and the semiconductors as well as the design of the state feedback. During the design process the efficiency and the high switching frequency are very important: the switching semiconductors are Gallium Nitride based. Then, a linear-quadratic regulator is designed and applied to the particular case of a buck converter.

scholarly journals High Power Efficiency Buck Converter Design for Standalone Wind Generation System

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Yigeng Huangfu ◽  
Ruiqing Ma ◽  
Bo Liang ◽  
Yuren Li
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Experimental Tests ◽  
Power Converter ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Wind Generation ◽  
Generation System ◽  
Point Tracking ◽  
Wind Generation System

In wind generation system, the power converter efficiency is one of the key factors for the performance of the system. In those systems, DC/DC Buck converter is widely used for high power system. Considering the converter’s cost and efficiency, this paper mainly focuses on the design of an improved topology Buck converter adopted for high power standalone wind generation system. The designed converter uses multi-MOSFETs in parallel instead of the IGBTs, in order to increase the conductive current as well as the converter switch frequency. From the experimental tests results, the maximum efficiency of the designed 2 kW Buck converter is up to 96% based on maximum power point tracking (MPPT) method.

Skin Effect-Related AC Resistance study in Macroscopic Scale Carbon Nanotube Yarn Applicable to High-Power Converter

2021 ◽  
pp. 1-1
Author(s):  
Kyoung-Tak Kim ◽  
Mohana Sundar Manoharan ◽  
Mohamed atef Tawfik ◽  
Chungu Lee ◽  
Junghwan Park ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Power ◽  
Skin Effect ◽  
Power Converter ◽  
Macroscopic Scale
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