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Principle and parameter design of arc welding inverter using soft switching technique

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China Welding 1998年第1期7卷 63-70页

作者：陈树君冯雷李亮玉殷树言张树田

The soft switching are welding inverter reduces switching losses and improves operating environment of devices by using Zero-Voltage-Transition (ZVT) technique. Step-by-step analysis of each timing interval and the associating voltage and current waveforms are included for the Full-Bridge Zero-Voltage-Switched PWM converter. Numerous design equations supporting the phase-shifted soft switching technique are highlighted.

关键词： soft switching arc welding inverter Zero-Voltage-Transition (ZVT) Zero-Voltage-switching (ZVS)

COMPUTERIZED SIMULATION AND EXPERIMENTAL RESEARCH ON soft-switching ARC WELDING INVERTER POWER SOURCE

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Acta Metallurgica Sinica(English Letters) 2000年第1期13卷 128-132页

作者： S. J. Chen S. Y. Yin L. Feng and L. Y. Li( 1) School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, China 2)National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 150001, China)

Based on the existing component models in the Pspice software package, a combined model for Insulat- ed the Bipolar Transistor (IGBT) is established, in which a non - linear is introduced to represent the parasitic capacitance. Using this model, computerized simulation is conducted for the FB - ZVZCS - PWM soft - ewitching converter,the switching and energy-transferring characteristics of the components are *** simulation results are testified by *** is proved that by abopting appropriate models,computerized simulation becomes an effective tool for investigation of arc welding inverter power source.

关键词： arc welding inverter,computerized simulation.IGBT soft switching

A Novel Polymorphic Topology with Hybrid Control Strategy Based LLC Resonant Converter for Ultra-Wide Input Voltage Range Applications

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Energy Engineering 2021年第2期118卷 341-361页

作者： Chi Zhang Yong Shi Xuwei Gui School of Electrical and Control Engineering Shaanxi University of Science and TechnologyXi’an710021China

To realize effective utilization of renewable energy sources,a novel polymorphic topology with hybrid control strategy based LLC resonant converter was analyzed and designed in this *** combining the merits of a full bridge LLC resonant converter,three-level half bridge LLC resonant converter,and variable frequency control mode,the converter realizes an intelligent estimation of input voltage by automatically changing its internal cir-cuit *** this control strategy,different input voltages determine different operation *** is achieved in full bridge LLC mode when the input voltage is *** the input voltage rises to a certain level,it operates in three-level half bridge LLC *** switches are digital and entirely carried out by the DSP(Digi-tal Signal Processor),which means that an auxiliary circuit is unnecessary,where a simple strategy of software modification can be *** results of a 500W prototype with 100V~600V input voltage and full load efficiency of up to 92%are developed to verify feasibility and *** type of converter is suitable for applications with an ultra-wide input voltage range,such as wind turbines,photovoltaic generators,bioenergy,and other renewable energy sources.

关键词： Renewable energy sources power converter ultra-wide input voltage range multi-levels operation mode hybrid control strategy soft switching

ZVS of arc welding inverter in light load

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China Welding 2005年第2期14卷 117-120页

作者：方臣富殷树言侯润石于明温永平 College of Mechanical Engineering & Applied Electronics Technology Beijing University of Technology Beijing 100022 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

It is very difficult for arc welding inverter to realize Zero-Voltage-switching （ZVS） because the load of arc welding inverter changes violently. An improved PS-FB-ZVS-PWM （ Phase-Shifted Full-Bridge Zero-Voltage-switching Pulse-Width-Modulation） topology is proposed in this paper. A saturate resonant inductor is in series with the primary side of the transformer, while an auxiliary inductor is in parallel with the secondary side of the transformer to increase reactive current in light load or unload state, so the zero voltage switching of power devices is realized during switching course in light load or unload state.

关键词： soft switching arc welding inverter inductor

Closed Loop Control of Bi-Directional soft Switched Quasi Z-Source DC-DC Converter

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Circuits and Systems 2016年第5期7卷 574-584页

作者： A. Suresh M. R. Rashmi V. Madusuthanan P. Vinoth Kumar Department of Electrical and Electronics Engineering S.A. Engineering College Chennai India Department of EEE Amrita School of Engineering Amrita Vishwa Vidyapeetham Bengaluru India

Quasi Z-source converter is a single stage soft switched power converter derived from Z-source converter topology, employing an impedance network coupling the source with the converter. The quasi Z-source source converter can buck or boost the voltage and current flow is bidirectional. The duty cycle of the switch can be adjusted to maintain constant voltage during load change. To obtain constant output voltage, proper controller design is a must. This paper presents closed loop control of quasi Z-source converter using PI controller where controller parameters are estimated using the small signal model of the entire system. The transfer function of the system with AC sweep is used to obtain appropriate proportional and integral gain constants to reduce transient dynamics and to reduce steady state error.

关键词： Quasi Z-Source Network PSIM soft switching switching Losses Smart Control PI Controller Design

Design and Experimentation of FPGA-Based soft-Switched Interleaved Boost Converter for Telecommunication System

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Circuits and Systems 2016年第9期7卷 2702-2711页

作者： &emsp Chitravalavan Dr. R. Seyezhai PRIST University Thanjavur India Sri Sivasubramaniya Nadar College of Engineering Chennai India

This paper proposes the design and experimentation of digital control of soft-switched interleaved boost converter using FPGA for Telecommunication System. The switching devices in the proposed converter are turned on and off with Zero Voltage switching (ZVS) and Zero Current switching (ZCS) respectively. The circuit is operated in Continuous Conduction Mode (CCM) with various load ranges having duty cycle of more than 50%. The proposed converter is studied by developing the simulation module in MATLAB/SIMULINK. A PI controller is designed and implemented in FPGA to obtain a regulated DC output for line and load variations. Simulation and experimentation results are verified with a prototype development of the proposed converter. The results indicate that the converter performance is enhanced with closed loop control.

关键词： Interleaved Boost Converter (IBC) Continuous Conduction Mode (CCM) Zero Voltage switching (ZVS) Zero Current switching (ZCS) soft switching Digital PI Controller FPGA

A Photovoltaic Generation System Based on Wide Voltage-Gain DC-DC Converter and Differential Power Processors for DC Microgrids

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Chinese Journal of Electrical Engineering 2017年第1期3卷 84-95页

作者： Zhaoxin Qiu Kai Sun State Key Laboratory of Power System Tsinghua UniversityBeijing100084China

In this paper,a photovoltaic(PV)generation system based on front-stage differential power processors(DPP)and BACK-stage centralized wide voltage-gain converter is *** resonant switched capacitor(ReSC)converter,which features high power density and high efficiency,is employed as the differential power processor and aims at processing the differential power among series-connected PV modules,avoiding the great power loss caused by power mismatch of PV *** ReSC converter in PV system can operate in equalization mode or MPPT mode and both modes are *** BACK-stage DC-DC converter is implemented as the dual-phase-shift controlled full-bridge converter(DPS-FBC).It has high conversion efficiency and wide voltage gain,suitable for PV generation *** current source control for grid-connected mode and the voltage source control for islanding mode are developed for ***,for the whole system with front and BACK stage converters,the dual-mode control strategy is *** the system is connected to the grid,DPS-FBC operates as the current source for global MPPT for PV modules while ReSC converters operate in maximum power point tracking(MPPT)mode for local *** the system operates in an island,DPS-FBC works as the voltage source for constant output voltage control and ReSC converters work in equalization *** mode switch is based on the voltage of output DC *** and experiments verify the feasibility of the proposed PV generation system and the effectiveness of the proposed control algorithm.

关键词： Photovoltaic system resonant switched capacitor dual phase-shift control soft switching

Critical Transient Processes of Enhancement-mode GaN HEMTs in High-efficiency and High-reliability Applications

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CES Transactions on Electrical Machines and Systems 2017年第3期1卷 283-291页

作者： Lucas(Juncheng)Lu Guanliang Liu Kevin(Hua)Bai GaN Systems Inc OttawaK2K 3G8 Canada University of Michigan-Dearborn Dearborn48128USA

Wide-bandgap devices,such as silicon-carbide metal-oxide-semiconductor field-effect transistors(MOSFETs)and gallium-nitride high electron mobility transistors(HEMTs),exhibit an excellent figure of merits compared to conventional silicon *** of applying such fast switches include accurate extraction and optimization of parasitics especially when 6high-efficiency operation,all of which require the comprehensive understanding of such switch especially its interaction with peripheral *** for the enhancement-mode GaN HEMTs without the intrinsic body diode,when reverse conducting,its high voltage drop causes a high dead-time loss,which has rarely a concern in silicon *** paper focuses on 650V/30~60A enhancement-mode GaN HEMTs provided by GaN Systems,analytically models its switching behaviors,summarizes the impact of parasitics and dead time,and applies it in two DC/DC *** design rules are generated not only for soft switching but also for hard switching applications.

关键词： DC/DC converter dead time double pulse test GaN HEMT soft switching

Induction Heating Appliances with Phase-Shifted Control Based on Time-Sharing Control 25th

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Induction Heating Appliances with Phase-Shifted Control Base...