• Title/Summary/Keyword: 정류기

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Module-Type Switching Rectifier for Cathodic Protection of Underground and Maritime Metallic Constructions (지하매설 및 해양 금속구조물 음극방식용 모듈 타입 스위칭 정류기)

  • 문상호;김보경;김인동;노의철;권영원;정성우;임헌호
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.6
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    • pp.570-578
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    • 2002
  • Cathodic protection is widely used to prevent corrosion of steel materials buried in the underground and sea. As a rectifier for cathodic protection, the conventional phase-controlled rectifiers have been used so far in spite of such shortcomings as large volume, heavy weight and floor power factor. In order to overcome such disadvantages, this paper proposes a new module-type switching rectifier for cathodic protection, which is composed of two parts, namely, AC/DC converter and module- type DC/DC converter. The AC/DC converter is a single-phase IGBT PWM rectifier, thus resulting in almost unity power factor and controlled DC output voltage. The module-type DC/DC converter operates under ZVS/ZCS switching condition to permit high frequency switching operation. It enables to use high-frequency transformer for electrical isolation, thus reducing volume and weight of overall system and improving system efficiency. It should be anticipated that the proposed rectifier techniques apply to the similar technical areas.

A design of rectifier for WPC/A4WP wireless power transfer (WPC/A4WP 무선전력전송을 위한 정류기 설계)

  • Park, Joonho;Moon, Yong
    • Journal of IKEEE
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    • v.22 no.2
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    • pp.393-401
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    • 2018
  • In this paper, a rectifier for WPC / A4WP wireless power transmission is designed. The proposed rectifier supports both WPC (Wireless Power Consortium) and A4WP (Alliance For Wireless Power) and is designed with full-bridge rectifier. WPC transmits power at the frequency of 100kHz to 205kHz and A4WP at the frequency of 6.75MHz. Since the bridge rectifier uses a MOSFET instead of a diode, the reverse current flows and the efficiency is affected if the output voltage is higher than the input voltage. Therefore, we added the reverse current detector that detects the current flowing through the MOSFET and shut off the reverse current. The frequency discriminator is used because the rectifier has different frequency band. The proposed rectifier was designed using $0.35{\mu}m$ CMOS high voltage process. The input voltage is up to 18V and the rectifier operates at 100kH to 205kHz, 6.78MHz frequency. The maximum efficiency is 94.8% and the maximum power transfer is 5.78W.

Analysis for light-load regulation of LLC resonant converter using synchronous rectifier control (동기정류기 제어를 적용한 LLC 공진형 컨버터의 경 부하 레귤레이션 특징 분석)

  • Kim, Keon-Woo;Moon, Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.5-6
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    • 2017
  • 이 논문에서는 경 부하 레귤레이션 역량을 키우기 위한 새로운 동기정류기 제어 방법을 제안한다. 제안하는 방법은 동기정류기의 턴-온 시간을 늘려줌으로써 동기정류기에 음의 방향으로 전류를 흘려주는 방식을 사용한다. 동기정류기의 턴온 시간에 따른 전압이득의 변화를 확인하여 경 부하 레귤레이션 특징을 분석한다. 이를 통하여 추가적인 소자 없이 경 부하시의 레귤레이션 문제를 해결한다.

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Current THD Improvement of Valley-Fill Rectifier (밸리-필 정류기의 전류 THD 개선)

  • Lee, Chi-Hwan;Choi, Nam-Yerl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.1
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    • pp.87-94
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    • 2008
  • A method for improving current THD of Valley-fill rectifier is proposed in this paper. The proposed topology combines a boosting inductor with Valley-fill rectifier which carry out AC/DC conversion and PFC simultaneously The boosting effect by PWM switching makes low THD current and improve of Valley-fill rectifier. The operation modes and THD of input current are analyzed as applied the boosting inductor, and the optimum value of boosting inductor is determined A 100[W] single-stage converter has been designed and tested. Experimental results are resented to verify the validity of the proposed method.

A New 24-Pulse Diode Rectifier for High Voltage and High Power Application (새로운 고전압 대전력용 24펄스 다이오드 정류기 시스템)

  • 최세완;김기용
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.3
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    • pp.304-309
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    • 1999
  • In this paper, a new 24longleftarrowpulse diode rectifier system based upon the conventional series-connected 12-pulse rectifier is p proposed with the least number of switching devices and low VA rating of the additional passive components. The p proposed approach does not employ any active switching devices. Therefore, the system is rugged and simple to i implement. Detailed analysis with VA rating calculation of the components is presented and experimental results from a a 220V, 3kV A rectifier system verify the proposed concept.

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Modeling of a 12-pulse Rectifier using EMTP (EMTP를 이용한 12-펄스 정류기 모델링)

  • Moon, Da-Hye;Seong, No-Kyu;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2291-2292
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    • 2008
  • HVDC(High Voltage Direct Current) 송전 시스템은 세계 각국에서 경쟁적으로 개발하고 있으며 계통에의 연계가 점점 증가하고 있다. 전형적인 HVDC 송전 시스템에서는 낮은 고조파 함유율과 높은 전압율 등의 이유로 주로 12-펄스 사이리스터 정류기가 사용된다. 본 논문에서는 12-펄스 정류기를 EMTP(ElectroMagnetic Transient Program)를 이용하여 모델링 하였으며, 고조파 분석을 통하여 모델링의 적절성을 검증하였다.

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A Study on the D-Q Control based Output Voltage Control Algorithm and EMTP-RV Simulation of Three-phase 6-Pulse PWM Rectifier (3상 6펄스 PWM 정류기의 D-Q 제어 기반 출력전압 제어 알고리즘 및 EMTP-RV 시뮬레이션 연구)

  • Ko, Yun-Seok
    • The Journal of the Korea institute of electronic communication sciences
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    • v.16 no.1
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    • pp.45-52
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    • 2021
  • The space vector control based voltage control method for a three-phase PWM rectifier requires a lot of effort to design an optimal switching pattern since a switching pattern for the switching section must be designed. In this study, a D-Q control based SPWM output voltage control algorithm was studied for the three-phase six-pulse CVS type rectifier. In the output voltage control algorithm, three-phase reference signals are obtained from the D-Q transformation based on the space vector representation method, instead of the switching pattern, SPWM method is used to generate rectifier switching control signals. Next, a three-phase six-pulse CVS PWM rectifier based on D-Q transformation and SPWM was modeled using EMTP-RV. Finally, the validity of the D-Q control-based SPWM voltage control algorithm was confirmed by comparing the output voltage waveform obtained through EMTP-RV simulation works with a reference value and confirming that the output voltage accurately follows the reference voltage.

Development of Low Voltage. High Current Thyristor Converter for Spark Plasma Sintering (방전 플라즈마 소결접합용 저전압, 대전류 사이리스터 정류기 개발)

  • Lee, Eul-Jae;Choi, Jung-Soo;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1030-1032
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    • 2002
  • 본 논문은 새로운 개념의 방전 플라즈마 소결 접합장비에 적용된 출력펄스 가변형 저전압, 대전류 사이리스터 정류기의 개발에 대하여 설명하고 있다. 6펄스 형태로 개발된 대용량 출력펄스 가변형 정류기는 공냉식으로 제작되어 기존의 대용량 정류기에서 적용한 수냉식보다 구조가 단순하며 최대 l1600A의 출력을 펄스 단위로 반복적으로 차단 및 전류하는 것이 가능하도록 설계되었다. 전류분배를 위한 버스바의 형태는 기구적인 설계만으로 간단히 대전류를 분배할 수 있도록 하였으며 디지털 연산에 의한 PLL 방식으로 입력 전압의 동기가 필요하지 않다. 시뮬레이션과 실물부하를 연결한 실험을 통해 제안한 방법 및 성능의 우수성을 조사하였다.

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A Pulse Frequency Control of Single-switch Three-phase ZCS Buck Rectifiers (단일 스위치 3상 ZCS 강압형 정류기의 펄스 주파수 제어)

  • 송중호;김용덕;이동윤;최익;최주엽;유지윤
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.1
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    • pp.82-90
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    • 1999
  • A pulse frequency control method for single-switch three-phase buck rectifiers is comprehensively studied in this paper. The proposed pulse frequency control method leads the three-phase buck rectifier to a high performance system that can draw the nearly sinusoidal input-line currents. The simulated and experimental results demonstrate that the system provides low total harmonic distortion of the input-line currents, high-power factor, and good output voltage regulation against load change.

Discrete-Time Dynamic Modeling and Start-Up Inrush Elimination Technique for New Push-Pull Quantum Series Resonant Rectifier with Wide Output Voltage Range (출력전압 범위가 넓은 새로운 푸시풀 퀀텀 직렬공진형 정류기를 위한 이산시간 동적 모델링과 기동 돌입전류 제거기법)

  • Moon, Gun-Woo;Yoon, Suk-Ho;Kim, Yong
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.11 no.4
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    • pp.100-108
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    • 1997
  • A combined buck and boost push-pull quantum series resonant rectifier(PPQSRR) is newly proposed to achieve a power factor correction without start-up inrush current. Based on the developed dynamic modeling of the proposed rectifier, an inrush current elimination control technique is proposed and the usefullness of the proposed rectifier and control method are verified by computer simulation and experimental results. With the proposed control method, a high power factor and wide range of output voltage can be obtained.

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