• Title/Summary/Keyword: Soft-switching

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A Novel Auxiliary Edge-Resonant Snubber-Assisted Soft Switching PWM High Frequency Inverter with Series Capacitor Compensated Resonant Load for Consumer Induction Heating

  • Ahmed Nabil A.;Iwai Toshiaki;Omori Hideki;Lee Hyun-Woo;Nakaoka Mutsuo
    • Journal of Power Electronics
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    • v.6 no.2
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    • pp.95-103
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    • 2006
  • In this paper, a novel prototype of auxiliary switched capacitor assisted voltage source soft switching PWM Single-Ended Push Pull (SEPP) series capacitor compensated load resonant inverter with two auxiliary edge resonant lossless inductor snubbers is proposed and discussed for small scale consumer high-frequency induction heating (IH) appliances. The operation principle of this inverter is described by using switching mode equivalent circuits. The newly developed multi resonant high-frequency inverter using trench gate IGBTs can regulate its output AC power via constant frequency edge-resonant associated soft switching commutation by using an asymmetrical PWM control or duty cycle control scheme. The brand-new consumer IH products which use the newly proposed edge-resonant soft switching PWM-SEPP type series load resonant high-frequency inverters are evaluated using power regulation characteristics, actual efficiency vs. duty cycle and input power vs. actual efficiency characteristics. Their operating performance compared with some conventional soft switching high-frequency inverters for IH appliances is discussed on the basis of simulation and experimental results. The practical effectiveness of the newly proposed soft switching PWM SEPP series load resonant inverter is verified from an application point of view as being suitable for consumer high-frequency IH appliances.

A New Dual-Active Soft-Switching Converter for an MTEM Electromagnetic Transmitter

  • Wang, Xuhong;Zhang, Yiming;Liu, Wei
    • Journal of Power Electronics
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    • v.17 no.6
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    • pp.1454-1468
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    • 2017
  • In this study, a new dual-active soft-switching converter is proposed to improve conversion efficiency and extend the load range for an MTEM electromagnetic transmitter in geological exploration. Unlike a conventional DC/DC converter, the proposed converter can operate in passive soft-switching, single-active soft-switching, or dual-active soft-switching modes depending on the change in load power. The main switches and lagging auxiliary switches of the converter can attain soft-switching over the entire load range. The conduction and switching losses are greatly reduced compared with those of ordinary converters under the action of the cut-off diodes and auxiliary windings coupled to the main transformer in the auxiliary circuits. The conversion efficiency of the proposed converter is significantly improved, especially under light-load conditions. First, the working principle of the proposed converter is analyzed in detail. Second, the relationship between the different operating modes and the load power is given and the design principle of the auxiliary circuit is presented. Finally, the Saber simulation and experimental results verify the feasibility and validity of the converter and a 50 kW prototype is implemented.

Synchronous Soft Switching Boost Converter (동기형 소프트 스위칭 부스트 컨버터)

  • Kim, Jun-Gu;Kim, Jae-Hyung;Won, Chung-Yuen;Jung, Yong-Chae
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.187-189
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    • 2008
  • This paper presents the synchronous soft switching boost converter. It is shown that the proposed converter effectively reduces conduction loss by using MOSFET device in place of diode in the conventional boost converter. Also, this soft switching boost converter can reduce switching loss using ZVS method through resonant inductor and capacitor. The proposed synchronous soft switching boost converter is suitable for PV generation system.

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Performance Evaluations of Digitally-Controlled Auxiliary Resonant Commutation Snubber-Assisted Three Phase Voltage Source Soft Switching Inverter

  • Hiraki, Eiji;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.3 no.1
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    • pp.1-9
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    • 2003
  • This paper presents a performance analysis of typical Auxiliary Resonant Commutation Snubber-assisted three phase voltage source soft switching inverter which can operate under a condition of Zero Voltage Switching (ZVS) using a digital control scheme which is suitable for high power applications compared with resonant DC link snubber assisted soft switching inverter. The system performances of this inverter are illustrated and evaluated on the basis of experimental results.

A New High Efficiency Interleaved Buck Converter with Soft-switching Scheme (소프트 스위칭 방식을 적용한 고효율 인터리브드 벅 컨버터)

  • Kim, Nak-Yoon;Choi, Hyun-Chil
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.2
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    • pp.116-123
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    • 2014
  • In this paper, a soft-switching scheme for the PWM interleaved buck converter(IBC) is newly proposed to obtain the advantages of both the conventional PWM interleaved buck and resonant converters such as ease of control, reduced switching losses and stresses, and low EMI. To obtain the soft-switching action, the proposed scheme employs an auxiliary circuit, which is added to the conventional interleaved buck converter and used to achieve soft-switching for both the main switches and the output diodes while not incurring any additional losses due to the auxiliary circuit itself. In this paper, the basic operations are discussed and design guidelines are presented. And through the experimental results, the usefulness of the proposed converter is verified.

Analysis, Design and Experimental Comparison of 2㎾ Power Factor Corrector Converters With Soft-Switching Methods (소프트 스위칭 방식을 갖는 2㎾ PFC 컨버터의 분석 설계 및 실험 비교)

  • Park, Gyeong-Su;Kim, Yun-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.9
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    • pp.537-544
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    • 2002
  • This paper describes a comparative analysis of soft switching boost converters through design, production and experiment. Soft switching boost converters are designed to satisfy the condition of input voltage 170-265Vac, output voltage 400Vdc, output current 5A, output power 20W-2000W and unit power factor. In addition, parameter values are designed so that system operation can be compared under this is similar conditions. The efficiency of the combined inductor soft switching boost converter was 97.63% with 1011 load better than that of other boost converter types. The combined inductor soft switching converter has simple circuit construction and low switching loss. EMI resulted by the switching noise, and harmonic distortion.

Characteristics of New PWM High Frequency Inverter Applied to Induction Heating (유도 가열에 적용되는 새로운 PWM 고주파 인버터의 특성)

  • Ryu, Yeoi-Joung;Lee, Sang-Wook;Mun, Sang-Pil;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.63-69
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    • 2018
  • In this paper, the operation principle of a bi-directional switch type resonant AC link snubber circuit was described, together with the practical design procedure, which employs in the proposed power module bridge package type resonant AC link snubber. The novel prototype of power module bridge package type resonant AC link snubber-assisted voltage type sinewave soft switching PWM inverter using IGBT power module was demonstrated herein. It was verified that both the auxiliary power switches in this resonant AC link snubber circuit and the main power switches commutate under the condition of soft switching commutation principle. In addition, the power losses of the new soft switching inverter treated here were analyzed by implementing the experimental data of the IGBT and diode v-i characteristics in addition to switching power loss characteristics into our original computer simulation software developed by the authors. Then, the voltage type sinewave soft switching PWM inverter was high efficiency than that of hard switching PWM inverter, along with performance operation waveforms. In the future, the comparative feasibility study of power module bridge type resonant AC link snubber and its related soft switching inverter in addition to the other types resonant snubber assisted soft switching inverter should be done from a practical point of view.

Study on the LED BLU Driving Circuit with a Local-dimming Structure (다분할 디밍구조를 갖는 LED BLU 구동회로에 관한 연구)

  • Park, Yu-Cheol;Kim, Hee-Jun;Chae, Gyun;Baek, Ju-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.2
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    • pp.292-300
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    • 2009
  • This paper presents an LED BLU driving circuit with a local-dimming structure. The efficiency of the proposed LED driver has been improved by parallel driving 8 serial-connected LED arrays. It employed the soft-switching boost converter topology to reduce the switching power loss of the hard switching boost converter. Soft- and hard-switching converters have the same structure except that the free-wheeling diode in the hard-switching converter is replaced with the n-channel MOSFET in the soft-switching one. The proposed boost converter was compared with the hard switching converter. The soft-switching converter reveals superior ripple and efficiency. A smaller inductance can be used for the soft-switching converter contrasting to the hard-switching one. We also studied on an over-voltage protection circuit of the output of the driver at the no load condition. The protection circuit was applied to the proposed driver, and its operation was confirmed by experiment. Using a local-dimming technique, power consumption of LCD BLUs can be reduced as low as possible according to the brightness of its image.

Efficiency Improvement of New Soft Switching Type Buck-Boost Chopper (새로운 소프트 스위칭형 벅-부스터 컨버터의 효율개선)

  • 고강훈;곽동걸;서기영;권순걸;이현우
    • Proceedings of the KIPE Conference
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    • 1998.11a
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    • pp.44-48
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    • 1998
  • In the buck-boost DC-DC converter which is used at a certain situation such as in factories where loads often change a lot, the switches in the device make big energy loss in operating at Buck-Boost Mode due to hard switching and are affected by lots of stresses which decrease the efficiency rate of the converter. In order to improve this problem, to decrease the loss of snubber and switching, it has been investigated that zero voltage switching mode and zero current switching mode which make the operation of switches with soft switching. For the more sophisticated and advanced device, this paper is presented the Partial Resonant Soft Switching Mode Power Converter which is adapted the power converter having the partial resonant soft switching mode, that makes switches operate when the resonant current or voltage becomes zero by making the resonant circuit partially at turning on and off of the switches with suitable layout of the resonant elements and switch elements in the converter. Also, this paper includes the analysis and simulation of the Partial Resonant type Buck-Boost Chopper.

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Power Loss Analysis of Interleaved Soft Switching Boost Converter for Single-Phase PV-PCS

  • Kim, Jae-Hyung;Jung, Yong-Chae;Lee, Su-Won;Lee, Tae-Won;Won, Chung-Yuen
    • Journal of Power Electronics
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    • v.10 no.4
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    • pp.335-341
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    • 2010
  • In this paper, an interleaved soft switching boost converter for a Photovoltaic Power Conditioning System (PV-PCS) with high efficiency is proposed. In order to raise the efficiency of the proposed converter, a 2-phase interleaved boost converter integrated with soft switching cells is used. All of the switching devices in the proposed converter achieve zero current switching (ZCS) or zero voltage switching (ZVS). Thus, the proposed circuit has a high efficiency characteristic due to low switching losses. To analyze the power losses of the proposed converter, two experimental sets have been built. One consists of normal devices (MOSFETs, Fast Recovery (FR) diodes) and the other consists of advanced power devices (CoolMOSs, SiC-Schottky Barrier Diodes (SBDs)). To verify the validity of the proposed topology, theoretical analysis and experimental results are presented.