scholarly journals Positive output elementary Luo converter for fixed-frequency ZVS operation

2017 ◽  
Vol 65 (2) ◽  
pp. 255-262
Author(s):  
S. J. V. Bright ◽  
S. Ramkumar ◽  
H. Anand
Keyword(s):  
Electromagnetic Interference ◽  
Experimental Studies ◽  
Soft Switching ◽  
Switching Frequency ◽  
Fixed Frequency ◽  
Zero Voltage Switching ◽  
Power Semiconductor ◽  
Semiconductor Switches ◽  
Switching Losses ◽  
Zero Voltage

Abstract Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.

scholarly journals Design, Analysis and Implementation of a Novel Soft-Switched Bridgeless Interleaved Boost PFC Converter

2019 ◽  
Vol 8 (2) ◽  
pp. 3930-3935
Keyword(s):  
Power Factor ◽  
Electromagnetic Interference ◽  
Soft Switching ◽  
Current Harmonics ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Interleaved Boost Converter ◽  
Ripple Reduction ◽  
Source Voltage ◽  
Zero Voltage

In the modern era, the electronic equipments are widely used and it is required to maintain the supply current harmonics within the standards specified by IEC. Efforts are taken to get better power factor of these supplies using Bridgeless Interleaved Boost Converter (IBC) topology. The efficiency and the power factor of the bridgeless converter is improved in contrast to the conventional PFC as the bridged structure is eliminated. Main objective of the paper is to propose a novel Zero Voltage Switched Bridgeless IBC. This bridgeless configuration is investigated by analyzing the attributes such as output power, mark-space ratio, source voltage, input current with each other. With zero-voltage switching, the voltage regulator can engage in soft switching, which helps to minimize switching losses and electromagnetic interference. This paper also compares performance parameters such as power factor, efficiency, THD and ripple with and without ZVS in a bridgeless IBC circuit. The results show that there is a considerable ripple reduction and power factor improvement with increase in efficiency on incorporating soft switching. Replication of the projected circuit is executed in simulation and the outputs are verified using hardware implementation.

A Novel Soft Switching Based Fuzzy Logic Control for Single Phase Inverter

2014 ◽  
Vol 573 ◽  
pp. 143-149
Author(s):  
N. Ismayil Kani ◽  
B.V. Manikandan ◽  
Prabakar Perciyal
Keyword(s):  
Fuzzy Logic ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Soft Switching ◽  
Switching Frequency ◽  
Pwm Inverter ◽  
Zero Voltage Switching ◽  
Control Scheme ◽  
Zero Voltage ◽  
Voltage Switching

—This The Pulse Width Modulation (PWM) DC-to-AC inverter has been widely used in many applications due to its circuit simplicity and rugged control scheme. It is however driven by a hard-switching pulse width modulation (PWM) inverter, which has low switching frequency, high switching loss, high electro-magnetic interference (EMI), high acoustic noise and low efficiency, etc. To solve these problems of the hard-switching inverter, many soft-switching inverters have been designed in the past. Unfortunately, high device voltage stress, large dc link voltage ripples, complex control scheme and so on are noticed in the existing soft-switching inverters. This proposed work overcomes the above problems with simple circuit topology and all switches work in zero-voltage switching condition. Comparative analysis between conventional open loop, PI and fuzzy logic based soft switching inverter is also presented and discussed. Keywords—Zero voltage switching, Inverter, Dc link, PI controller, Fuzzy logic system control ,Modulation strategy, Soft switching

scholarly journals Design and operation of closed-loop triple-deck buck-boost converter with high gain soft switching

2020 ◽  
Vol 11 (1) ◽  
pp. 523
Author(s):  
S. Narasimha ◽  
Surender Reddy Salkuti
Keyword(s):  
Closed Loop ◽  
High Gain ◽  
Pi Controller ◽  
Boost Converter ◽  
Vital Role ◽  
Soft Switching ◽  
Parallel Operation ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Zero Voltage

<span>This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.</span>

scholarly journals Analysis of Intrinsic Switching Losses in Superjunction MOSFETs Under Zero Voltage Switching

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1124
Author(s):  
Maria Rogina ◽  
Alberto Rodriguez ◽  
Diego G. Lamar ◽  
Jaume Roig ◽  
German Gomez ◽  
...  
Keyword(s):  
Simulation Models ◽  
Soft Switching ◽  
Energy Losses ◽  
Switching Frequency ◽  
Zero Voltage Switching ◽  
Power Transistors ◽  
Switching Losses ◽  
Light Load ◽  
High Switching Frequency ◽  
Output Capacitance

Switching losses of power transistors usually are the most relevant energy losses in high-frequency power converters. Soft-switching techniques allow a reduction of these losses, but even under soft-switching conditions, these losses can be significant, especially at light load and very high switching frequency. In this paper, hysteresis and energy losses are shown during the charge and discharge of the output capacitance (COSS) of commercial high voltage Superjunction MOSFETs. Moreover, a simple methodology to include information about these two phenomena in datasheets using a commercial system is suggested to manufacturers. Simulation models including COSS hysteresis and a figure of merit considering these intrinsic energy losses are also proposed. Simulation and experimental measurements using an LLC resonant converter have been performed to validate the proposed mechanism and the usefulness of the proposed simulation models.

scholarly journals Analysis, Design and Experimental Validation of Modified Simple Soft Switching DC-DC Boost Converter

2015 ◽  
Vol 16 (4) ◽  
pp. 331-337 ◽  
Author(s):  
S. Raghavendran ◽  
B. Chitti Babu ◽  
Luigi Piegari
Keyword(s):  
Theoretical Analysis ◽  
Experimental Validation ◽  
Soft Switching ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Zero Current ◽  
Analysis Design ◽  
Zero Voltage ◽  
Voltage Switching

Abstract This paper investigates a modified simple soft switching dc-dc converter for low power applications. This simple topology uses an auxiliary switch, an inductor and a capacitor to operate the converter without switching losses. The efficiency of the converter is improved by transferring the energy that would be dissipated during the switching to the load. The main switch turns-on with zero current switching (ZCS) and turns-off with zero voltage switching (ZVS), while the auxiliary switch turns-on and turns-off with zero voltage switching (ZVS). The detailed theoretical analysis and the design equations are described. In addition to that, the analysis of proposed converter is demonstrated by both simulation and experimental results for effectiveness of the study.

scholarly journals Stability Prediction of Soft Switched Isolated DC-DC Converter

2019 ◽  
Vol 9 (2) ◽  
pp. 953-957
Keyword(s):  
High Efficiency ◽  
Low Voltage ◽  
Dynamic Performance ◽  
Stability Prediction ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Power Semiconductor ◽  
Semiconductor Switches ◽  
Zero Voltage ◽  
Voltage Switching

Mathematical analysis and stability prediction of soft switched isolated dc-dc converter is presented in this paper. Half bridge dc-dc converter is an attractive topology for low voltage applications due to its simplicity, lower cost, improved reliability and enhanced dynamic performance. Both power semiconductor switches of the proposed isolated converter operate asymmetrically under Zero Voltage Switching (ZVS) to achieve high efficiency and low voltage stress. Furthermore, the ringing resulted from the oscillation between the transformer leakage inductance and the junction capacitance of two switches is eliminated. Conversion efficiency is also improved by providing synchronous rectifier with very small output filter. The operating principle, state space analysis and control strategy of proposed converter is explained with small signal model. Experimental results are presented to explain the zero voltage switching capability and stability features of proposed converter.

scholarly journals Rotary Wireless Inductive Transmitter Powered by ZVS Resonant Convertor

2019 ◽  
Vol 25 (4) ◽  
pp. 17-22 ◽  
Author(s):  
Dimitar D. Arnaudov ◽  
Nikolay D. Madzharov ◽  
Nikolay L. Hinov
Keyword(s):  
Experimental Studies ◽  
System Stability ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Wireless Power ◽  
Rotating Platform ◽  
Zero Voltage Switching ◽  
Wide Range ◽  
Zero Voltage ◽  
Voltage Switching

In this work, an inductive wireless power transfer module powered by resonant converter is studied. The system consists of a zero voltage switching resonant converter and a rotary wireless power transmitter. The design of the rotary wireless power transmitter is presented. Simulation and experimental studies of the system confirm reliable operation of the power electronic converter with a wide range of loads. The zero voltage switching is maintained without significant adjustments in the switching frequency. This improves the system stability with variations in the air gap between transmitting and receiving modules or the magnetic coupling ratio. The studied system is suitable for powering loads placed on a rotating platform or other applications where the disadvantages of moving electrical contacts are undesirable.

PWM Control for Actively Clamped Resonant DC-Link Inverter on Soft-Switching

2014 ◽  
Vol 989-994 ◽  
pp. 2886-2889
Author(s):  
Yan She
Keyword(s):  
Power Quality ◽  
Electromagnetic Interference ◽  
Pulse Width Modulation ◽  
Liquid Crystal Display ◽  
Input Power ◽  
Soft Switching ◽  
Control Mode ◽  
Switching Frequency ◽  
Voltage Space Vector ◽  
Switching Losses

Due to the active inverter in industrial application, if use hard switching mode, not only may have the switch losses, but also may produce electromagnetic interference and harmonic, these power quality is affected. This paper presents the design of a soft-switching active inverter, that active clamped resonant DC-link inverter topology was used on the main circuit, the voltage space vector pulse width modulation (SVPWM) control mode was used on control circuit, using TMS320LF2407DSP programming, while the AT89C51 was responsible for liquid crystal display task, data exchanged and coordinated between double CPU. The experimental results show that, the device switching-losses can effectively reduce, the switching frequency can improve, input power quality can improve.

scholarly journals A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 214 ◽  
Author(s):  
Dong-Min Lee ◽  
Seung-Wook Hyun ◽  
Jin-Wook Kang ◽  
Yong-Su Noh ◽  
Chung-Yuen Won
Keyword(s):  
Pulse Width Modulation ◽  
Soft Switching ◽  
Zero Voltage Switching ◽  
Phase Current ◽  
Dual Active Bridge ◽  
Circulating Current ◽  
Operation Techniques ◽  
Simulation And Experiment ◽  
Output Capacitor ◽  
Zero Voltage

This paper examines the characteristics of the zero voltage switching (ZVS) and zero voltage transition (ZVT) soft-switching applied in the 3-phase current fed dual active bridge (3P-CFDAB) converter, which combines the advantages of the dual active bridge (DAB) converter and current-fed full bridge (CFFB) converter. When an active clamp circuit is added to the CFFB converter, the circuit configuration of the DAB converter is shown in part of the entire circuit. This allows the use of pulse width modulation (PWM) techniques which combine the PWM techniques of both the DAB converter and CFFB converter. The proposed converter performs both duty and phase control at the same time in order to reduce the circulating current and ripple current of the output capacitor, which are the disadvantages of the CFFB converter and DAB converter. In addition, the ZVS and ZVT soft switching areas were analyzed by means of the phase current and leakage inductor current in each transformers. To verify the principle and feasibility of the proposed operation techniques, a simulation and experiment were implemented with the 3P-CFDAB.

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