• 제목/요약/키워드: Soft-Switched Converter

검색결과 66건 처리시간 0.021초

스위칭 손실 없는 보조회로를 이용한 고효율 부우스트 컨버터 설계 (A New Soft-switched PWM Boost Converter with a Lossless Auxiliary Circuit)

  • 최현칠
    • 전력전자학회논문지
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    • 제11권2호
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    • pp.149-158
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    • 2006
  • 본 논문에서는 기존에 널리 사용되는 펄스폭 변조 (Pulse width modulation : PWM) 방식의 컨버터와 공진형 컨버터의 장점을 활용하고 단점을 보완할 수 있는 새로운 형태의 영전류 천이형 (Zero current transition : ZCT) 부우스트 컨버터를 제안한다. 제안한 회로는 기존의 PWM 부우스트 컨버터에 보조회로를 추가하여 주 스위치와 출력 다이오드의 스위칭 천이 순간에만 소프트 스위칭 조건을 제공함으로써 전체적인 동작은 기존의 부우스트 컨버터와 크게 차이가 없도록 하였다. 아울러, 보조회로에서의 부가적인 손실 역시 존재하지 않으므로 해서 고효율이 가능하게 된다. 본 논문에서는 제안한 회로의 동작을 분석하고 이를 바탕으로, 보조 회로의 소자값 결정에 도움이 되는 설계방식을 제공한다. 또한, 실험을 통하여 제안한 회로의 동작 원리 및 유용성을 검증하였다.

부분공진 소프트 수위칭기법을 적용한 스윗치드 리럭턴스 모터의 구공회로 (Converter for Switched reluctance Motor Applied Soft Switching Mode by Partial Resonant Mothod)

  • 김지수;이병두;김성두;정기환;강욱중;고희석;이수흠;이현우
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 F
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    • pp.2103-2105
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    • 1998
  • Switched Reluctance Motor is simple structure which used Accel/Decel application field because of cheap cost and High efficiency. For driving this motor, it is essential to need position sensor and driving converter. so, many topology and sensor have been studied untill now. Asymmetric Bridge Converter which has been known for the best control and efficiency is used chopping to control current of motor coil according to changing of motor speed. But this is embossed as a fault because it come to bring switching loss due to rapid switching frequency. In this paper, I applied to Soft Switching Mode by Partial Resonant Method to compensate these fault and to show the usabilityness of low switching device.

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하프 브리지 컨버터의 비대칭 제어 공진 특성 분석 (Analysis of Resonant Characteristics in Asymmetrical Control Half Bridge Converter)

  • 안중록;권명일;장도현
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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    • pp.58-61
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    • 2003
  • In this paper, resonant Characteristics of the soft switched asymmetrical half bridge converter is analysis. The operation principle for proposed converter is explained in steady state and its circuit is analyzed by means of equivalent circuit. Experimental results carried out on a system prototype are included in this paper.

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보조회로도 영전압영전류스위칭하는 DC-DC 변환기 (A Fully Soft Switched Full Bridge DC-DC converter)

  • 전성즙;조규형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 F
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    • pp.2512-2514
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    • 1999
  • A new zero voltage and zero current switching(ZVZCS) full bridge DC-DC converter with transformer isolation is proposed for arc welding machines. The proposed DC-DC converter uses an auxiliary transformer to obtain ZCS for leading leg, which provides load current control capability even in short circuit condition. The auxiliary circuit also operates in ZVZCS mode. The power rating of the auxiliary transformer is about 10% of the main transformer. The operation is verified by experiments for 12[KW] prototype.

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A New Approach to Reduced-Order Modeling of Multi-Module Converters

  • Park, Byung-Cho
    • Journal of Electrical Engineering and information Science
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    • 제2권4호
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    • pp.92-98
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    • 1997
  • This paper presents a new approach to obtaining a reduced-order model for multi-module converters. The proposed approach can be used to derive the reduced-order model for a wide class of multi-module converters including pulse-width-modulated (PWM) converters, soft-switched PWM converters, and resonant converters. The reduced-order model has the structure of a conventional single-module converter while preserving the dynamics of the original multi-module converter. Derivation procedures and the use of the reduced-order model is demonstrated using a three-module boost converter.

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비상전원 공급장치를 위한 넓은 입력전압 범위를 갖는 절연형 DC/DC 컨버터 (Isolated DC/DC Converter with Very Wide Input Voltage Ranges for Emergency Power Back-up System(EPBS))

  • 채형준;김경동;오형록;이준영
    • 전력전자학회논문지
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    • 제16권4호
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    • pp.334-341
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    • 2011
  • 본 논문은 비상전원 공급장치를 위한 넓은 입력전압 범위를 갖는 DC/DC 컨버터를 제안하고 그 설계 및 제작에 대하여 기술한다. 컨버터의 입력전압은 30V~400V이며 출력전압은 48V로, 2단 구성의 컨버터를 제안한다. 제안된 컨버터는 벅부스트 컨버터와 소프트 스위칭 특성을 갖는 LLC 공진 컨버터로 구성되며 LLC공진 컨버터는 고정주파수로 동작하며 벅부스트 컨버터에서 제어동작을 수행하여 제어를 단순화한다. 모의실험을 통해 설계된 회로를 검증하고 실제 300W급의 세트를 제작하여 그 성능을 검증한다.

Power Flow Control of Four Channel Resonant Step-Down Converters

  • Litvani, Lilla;Hamar, Janos
    • Journal of Power Electronics
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    • 제19권6호
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    • pp.1393-1402
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    • 2019
  • This paper proposes a new power flow control method for soft-switched, four channel, five level resonant buck dc-dc converters. These converters have two input channels, which can be supplied from sources with identical or different voltages, and four output channels with arbitrary output voltages. They are specially designed to supply multilevel inverters. The design methodology for their power flow control has been developed considering a general case when the input voltages, output voltages and loads can be asymmetrical. A special emphasize is paid to the limitations and restrictions of operation. The theoretical studies are confirmed by numerical simulations and laboratory tests carried out at various operation points. Exploiting the advantages of the newly proposed power control strategy, the converter can supply five level inverters in dc microgrids, active filters, power factor correctors and electric drives. They can also play an interfacing role in renewable energy systems.

스위칭 손실을 최소화한 부스트 방식의 역률 개선 회로 (Power Factor Correction Circuit with a Soft-switched Boost Scheme)

  • 이효재;최현칠
    • 전력전자학회논문지
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    • 제16권2호
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    • pp.122-129
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    • 2011
  • 본 논문에서는 소프트 스위칭 방식의 부스트 회로를 이용한 역률 개선 회로를 새롭게 제안하였다. 제안한 역률개선 회로를 구성하는 내부 회로는 기존 PWM 부스트 회로와 전반적인 동작은 동일하며 단지 스위칭 순간에만 영전압 혹은 영전류 스위칭 동작을 하게 된다. 따라서 기존의 PWM 회로와 같이 제어가 용이할 뿐만 아니라 소프트 스위칭에 의한 고효율 성능을 얻게 된다. 본 논문에서는 이러한 소프트 스위칭 회로를 이용하여 높은 효율을 가지는 역률 개선 회로를 체계적으로 설계하기 위한 방안을 제시하였다. 아울러 실험을 통하여 이러한 설계방법의 타당성과 제안한 역률 개선 회로의 우수성을 입증하였다.

부분 공진형 소프트 스위칭 PWM DC-DC 고전압 컨버터 (Soft-Switched PWM DC-DC High-Power Converter with Quasi Resonant-Poles and Parasitic Reactive Resonant Components of High-Voltage Transformer)

  • 김용주;신대철
    • 전력전자학회논문지
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    • 제4권4호
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    • pp.384-394
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    • 1999
  • This paper deals with a fixed frequency full-bridge inverter type DC-DC high-power converter with high frequency high voltage(HFHV) transformer-coupled stage, which operates under quasi-resonant ZVS transition priciple in spite of a wide PWM-based voltage regulation processing and largely-changed load conditions. This multi-resonant(MR) converter topology is composed of a series capacitor-connected parallel resonant tank which makes the most of parasitic circuit reactive components of HFHV transformer and two additional quasi-resonant pole circuits incorporated into the bridge legs. The soft-switching operation and practical efficacy of this new converter circuit using the latest IGBTs are actually ascertained through 50kV trially-produced converter system operating using 20kHz/30kHz high voltage(HV) transformers which is applied for driving the diagnostic HV X-ray tube load in medical equipments. It is proved from a practical point of view that the switching losses of IGBTs and their electrical dynamic stresses relating to EMI noise can be considerably reduced under a high frequency(HF) switching-based phase-shift PWM control process for a load setting requirements.

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친환경 자동차 HDC를 위한 고승압 소프트스위칭 양방향 컨버터 (High Gain Soft switching Bi-directional Converter for Eco-friendly Vehicle HDC)

  • 오세철;박준성;권민호;최세완
    • 전력전자학회논문지
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    • 제17권4호
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    • pp.322-329
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    • 2012
  • This paper proposes a non-isolated bidirectional soft-switching converter with high voltage for high step-up/down and high power applications. Compared to the conventional boost converter the proposed converter can achieve approximately doubled voltage gain using the same duty cycle. The voltage ratings of the switch and diode are reduced to half, which result in the use of devices with lower $R_{DS(ON)}$ and on drop leading to reduced conduction losses. Also, voltage ratings of the passive components are reduced, and therefore the total energy volume is reduced to half. Further, the switch is turned on with ZVS in the CCM operation which results in negligible surge caused leading to reduced switching losses. The validity of the proposed converter is proved through a 10kW prototype.