• Title/Summary/Keyword: PWM DC-DC converter

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A Study on the 3-level IGBT ZBS PWM DC/DC Converter with High Performance (3-레벨 IGBT ZVS PWM DC/DC 컨버터의 성능 향상)

  • 송인호;유상봉;현동석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.3
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    • pp.1-10
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    • 1997
  • 3-레벨 ZVS PWM DC/DC 컨버터는 풀브리지 ZVS PWM DC/DC 컨버터와 같은 동작 특성을 가지면서 입력전압의 반을 스위칭 소자의 차단전압으로 갖기 때문에 높은 입력을 갖는 DC-DC 변환시스템에 적합한 구조라 할 것이다. 그러나 부유 인덕턴스의 영향으로 인한 내외측 소자간의 차단전압 불균형의 문제와 경부하에서 영전압 스위칭 동작을 하지 못하므로 부하범위가 작다는 문제점을 가지고 있다. 이와 같은 문제점들은 시스템의 신뢰도를 낮추며, 경부하로 갈수록 효율을 떨어뜨리게 된다. 철도 차량과 같은 고압, 대용량의 시스템에서 이러한 문제들은 더욱 두드러 진다. 본 논문에서는 내외측 소자간의 차단전압 불균형의 문제를 없애며, 무부하에서 전부하까지 모든 부하 영역에서 영전압 스위칭 동작을 할 수 있는 새로운 3-레벨 ZVS PWM DC/DC 컨버터를 제시한다. 제안한 회로의 동작 특성과 타당성을 시뮬레이션 및 실험 결과를 통하여 입증한다.

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Input and output filter design of current source PWM converter for high-precision magnet power supply (고정밀 자석전원을 위한 전류형 PWM 컨버터의 입출력 필터설계)

  • 김효성;최재호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.1
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    • pp.30-41
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    • 1996
  • Current Source(CS) PWM converter is appropriate for the magnet power supply system which requests high power and high precision current control. Input and output filters should be installed to eliminate the current or voltage harmonics caused by the PWM switching for the CS PWM converter. But the input/output filters limit the output DC current range and may destroy the system with filter resonance, and make the system equation more complicated. In this paper, systematic and simple filter design method which considers not only the harmonic attenuation but also the total system good transfer function characteristics in the dc filter. The simulated and experimental results verify the proposed theory. (author). refs., figs., tabs.

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Two Stage Power Factor Correction (PFC) Converter With A Single PWM Controller

  • Park, Hang-Seok;Lee, Kyu-Chan;B.H. Cho
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.252-257
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    • 1998
  • Two-stage power factor correction (PFC) converter with a single PWM controller for universal input voltage (90-264V) is proposed. It consists of a power factor pre-regulator cascaded by a DC/DC converter as in a conventional two-stage approach. However, a single PWM controller is used as in a single-stage, single-switch PFC approach. The switch in the PFC part is synchronized with the switch in the DC/DC converter with a fixed switching frequency. Employing an adaptive delay scheme the switch in the PFC part is controlled to limit the energy storage capacitor voltage within a designed range for the optimum efficiency, and to reduce input current harmonic distortion. The experimental results obtained on a 200W (5V/40A) prototype PFC converter are given to verify the effectiveness of the proposed control method.

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High-Frequency Forward Transformer Linked PWM DC-DC Power Converter with Zero Voltage Switching and Zero Current Switching Bridge Legs

  • Moisseev, Serguei;Hamada, Satoshi;Ishitobi, Manabu;Hiraki, Eiji;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.2 no.4
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    • pp.278-287
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    • 2002
  • A novel zero-voltage and zero-current switching PWM DC-DC converter with lowered conduction losses is presented in this paper. A new double two-switch forward high frequency transformer type soft-switching converter topology is developed to minimize circulating currents occurs during freewheeling period. This converter has advantages as less number of the components, simple control principle under constant operation frequency, free of transformer Imbalance effect. The principle of operation is illustrated with steady-state analysis. Moreover, the effectiveness of the proposed converter topology is verified by implementation of a 500w-100kHz breadboard using IGBTs.

A Controller for PWM AC/DC Converter Considering Distorted Input Voltage (왜곡된 입력 전압을 고려한 PWM AC/DC 컨버터 제어기)

  • 송홍석;남광희
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.1-8
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    • 1997
  • PWM(Pulse Width Modulation) 컨버터의 제어에 있어서, 입력전압의 왜곡을 고려하지 않을 경우, 시스템의 성능 저하를 초래하게 된다. 본 논문은 왜곡된 3상 입력전압이 PWM 컨버터에 미치는 영향을 분석하고, 성능을 개선하기 위한 제어기를 설계한다. 제안된 방식은 단위 역률을 만족시키면서, THD(Total Harmonic Distortion) 및 DC-link 전압의 저차 ripple을 감소시킨다.

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DC-DC Converter Design For Electric Regenerative auxiliary Brake System (전기식 회생 보조 브레이크 시스템을 위한 DC-DC 컨버터 설계)

  • Kwak, Tae-Kyun;Moon, Chae-Joo;Lee, Jun-Young;Ko, Jong-Sun;Yoo, Chang-Hee
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.3
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    • pp.519-528
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    • 2019
  • Current brake system changes the kinetic energy into heat energy by friction-type of brake that the braking action is diverging into the air. The system has a device called a retarder that generates braking force. High-tech research on the high-speed response characteristics of retarders utilizing part of the braking energy of the retarder to save electrical energy consumption is already underway in advanced countries. In this paper, we propose DC-DC converter which converts 3-phase voltage generated from retarder to 24V DC voltage for battery charging and verify its validity through experiments.

Comarative Study on Current or Time Sharing Switches for High Efficiency DC/DC Converter (고효율 DC/DC 컨버터용 전류분할과 시분할 스위치 비교 연구)

  • Ko, Sung-Hun;Cho, Sung-Pil;Lee, Su-Won;Lee, Seong-Ryong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.1
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    • pp.68-75
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    • 2012
  • This paper presents a comparative analysis of the parallel operation of different switches in a DC/DC converter. In high power applications, multi-switch PWM power conditioners may be preferred despite a higher component count, due to the absence of low frequency filters, reduced switching losses and fault tolerance. The paper demonstrates how current sharing (CSH) and time sharing (TSH) lead to the reduction of switching stress in the parallel operation of switches in any converter. The solutions proposed in this study can be applied on different scales to other power conditioners for DC/DC converter systems. Discussions of the concepts, hypotheses and computer simulations are verified by 1 kW experimental results.

Reduction of Conducted Emission in Interleaved RPWM Buck Converter (인터리브드 RPWM Buck 컨버터의 전도성 노이즈 감소에 대한 연구)

  • Lee, Seunghyun;Lee, Keunbong;Nah, Wansoo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.4
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    • pp.298-308
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    • 2017
  • This paper presents a Interleaved Buck Converter(IBC) system with Random PWM to reduce electromagnetic noise by harmonics. Swithced mode power supply generally controlled by high switching frequency have a electromagnetic interference(EMI) issue due to the high-voltage/high-current switching to regulate the voltage in buck converter. To solve the problem. we present a novel IBC system with PRBS. IBC system has two active switches with 180 phase difference that controll the cicuit with two PWM signal. IBC system may be disadventageous for the cost due to the addtion of one set of switch, but it has adventages of power distribution, current ripple cancellation, fast transient response, and passive component size reduction. To verify the validity of study, simulation program has been bulit using PSIM and the experimental results of IBC system using RPWM was compared with the conventinal PWM and randomized PWM.

Optimal Control of a Three-Phase Voltage-Source PWM Converter with an Expanded Operation Region (확장된 동작 영역을 갖는 3상 전압원 PWM 컨버터의 최적 제어)

  • 민동기;안성찬;현동석;최종률
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.2
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    • pp.156-164
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    • 1998
  • The operation regions of a three-phase(3Ø) voltage-source(VS) PWM converter are classified in the current vector plane of the synchronous reference frame and their characteristics are explained. In the the power-factor decreasing region, the current control with unity power-factor can not give satisfactory performance to the given load because of the distortion of input current and the ripples and the steady-state errors in DC link voltage. In this paper, the derivation of the optimal current vector is proposed to solve these problems. With this, the input current can be controlled sinusoidally with available maximum power factor and the DC link voltage be the given load, resulting the expansion of the operation region of the 3Ø VS PWM converter. The validity of the proposed control method is proved by the experimental results.

A study on the characteristics comparision of Analog or Digitally PWM controlled converter (아날로그/디지털 PWM 제어방식의 컨버터 특성 비교에 관한 연구)

  • Jang, I.H.;Lee, Y.M.;Lee, G.Y.;Choi, M.H.;Kim, Y.J.;Baek, H.L.
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1218-1219
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    • 2011
  • 본 논문은 KA555 Timer을 이용한 PWM회로로 구성된 아날로그 방식의 DC-DC Buck Converter와 AVR ATmega128를 이용한 PWM회로로 구성된 디지털 방식의 Buck Converter을 설계하여 각각의 특성을 비교 분석하였다. 제안된 컨버터들은 공통적으로 전원을 공급받아 전압분압회로를 통해 DC-DC Buck Converter의 PWM 제어회로부에 공급되며, 아날로그방식 컨버터의 제어부는 KA555 timer을 이용하여 구형파회로와 미분회로를 구성하고, 출력된 삼각파와 정현파를 KA555 timer을 이용하여 PWM파형으로 제어한다. 디지털방식의 컨버터는 AVR RISC 8-bit 마이크로프로세서 ATmega128을 이용하여 PWM 제어부를 구성하고 이를 LCD창을 통해 그 값을 확인할 수 있도록 설계하였다. 본 논문에서는 두 가지 방식의 제어부를 구성하여 제작 및 실험함으로써, 각각의 장단점을 비교하여 시스템 구성시 요구조건인 소형경량, 단가저감, 효율 등을 비교하여 그 상황에 맞는 설계가 가능할 것이다.

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