• 제목/요약/키워드: auxiliary transformer

검색결과 116건 처리시간 0.026초

Zero-Voltage and Zero-Current Switching Interleaved Two-Switch Forward Converter

  • Chu, Enhui;Bao, Jianqun;Song, Qi;Zhang, Yang;Xie, Haolin;Chen, Zhifang;Zhou, Yue
    • Journal of Power Electronics
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    • 제19권6호
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    • pp.1413-1428
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    • 2019
  • In this paper, a novel zero-voltage and zero-current switching (ZVZCS) interleaved two switch forward converter is proposed. By using a coupled-inductor-type smoothing filter, a snubber capacitor, the parallel capacitance of the leading switches and the transformer parasitic inductance, the proposed converter can realize soft-switching for the main power switches. This converter can effectively reduce the primary circulating current loss by using the coupled inductor and the snubber capacitor. Furthermore, this converter can reduce the reverse recovery loss, parasitic ringing and transient voltage stress in the secondary rectifier diodes caused by the leakage inductors of the transformer and the coupled inductance. The operation principle and steady state characteristics of the converter are analyzed according to the equivalent circuits in different operation modes. The practical effectiveness of the proposed converter was is illustrated by simulation and experimental results via a 500W, 100 kHz prototype using the power MOSFET.

하이브리드형 압전 변압기의 고주파 승압 초퍼를 이용한 적응제어기법 유도전동기 속도 센서리스 벡터제어에 관한 연구 (A Study on the Speed Sensorless Vector Control for Induction Motor Adaptive Control Method using a High Frequency Boost Chopper of Hybrid Type Piezoelectric Transformer)

  • 황락훈;나승권;김영욱;최성식
    • 한국항행학회논문지
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    • 제17권3호
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    • pp.332-345
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    • 2013
  • 본 논문에서는 최근, 압전 변압기 기술의 급속한 발전을 이용하므로 자계의 잡음이 없고, 크기가 소형화되며 고효율과 고 전력 밀도, 누설자속이 없어 노이즈 발생이 없고, 공진주파수만을 이용하므로 출력파형이 정현파에 가까워 고조파 잡음이 없는 점을 이용하여 전기적인 등가회로를 적용하여 DC-DC 컨버터를 구현 하였다. 유도전동기 회전자 속도 개념에 자속 기준 모델 적용 시스템(FMRAS)을 적용하였다. 유도전동기의 벡터제어는 회전자 속도 정의의 추정값을 이용하여 실행 할 수 있고, 부가된 변화되는 모델로 회전자 목표값 계산을 수행 할 수 있다. 이 시스템은 PWM 공간 전압기법과 DC-DC 컨버터를 이용하여 벡터전류제어와 속도제어를 위한 PI제어기로 구성되어 있다. 제어를 위한 실행과 높은 속도계산을 디지털 신호 원칩 마이크로프로세서에 의해 수행 되었고, 시뮬레이션과 실험을 통해서 다양한 제어 방법의 타당성을 제시 하였다.

새로운 CCM 단일 전력단 역률보상 풀 브리지 컨버터 (New CCM Single Stage PFC Full Bridge Converter)

  • 임창섭;권순걸;조정구;송두익
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.986-989
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    • 2002
  • This paper proposes a new single stage power factor correction (PFC) full bridge converter which operates at continuous conduction mode(CCM). The proposed single stage PFC consists of typical zero voltage switching(ZVS) full bridge DC/DC converter, two transformer auxiliary windings, and two small inductors, and two diodes. Neither additional active switch nor any control circuit are added for PFC resulting in very low cost. The proposed converter provides input power factor correction with CCM control and tight output voltage regulation. All switching devices are operated under ZVS with minimum voltage stress. Operation principle and analysis are explained and verified with computer simulation and experimental results on a 1.2kW, 100kHz prototype.

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교류쵸퍼를 사용한 3상 강압형 전압제어장치 (A 3-phase step-down voltage regulator using AC choppers)

  • 류홍제;김종수;임근희;김득수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.1075-1077
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    • 2002
  • This paper describes a three-phase step-down AC voltage regulator using AC chopper and auxiliary transformer which is series connected with main input. It has many advantages such as fast voltage control, high efficiency and low THD. The operation principle and PWM method of the proposed regulator are described. Experimental results show that it can be used as step-down AC voltage regulator for power saving purpose very efficiently.

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영전압/영전류 스위칭을 이용한 고효율의 직렬 접속 배터리 전압 밸런싱 방법 (A High Efficiency Zero Voltage/Zero Current Transition Converter for Series Connected Battery Cell Equalization)

  • 김태훈;박남주;현동석;김래영
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2011년도 추계학술대회
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    • pp.26-27
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    • 2011
  • This paper focuses on the zero-voltage/zero current transition voltage equalization circuit for the series connected battery cell. By adding auxiliary resonant cells at the main switching devices such as MOSFET or IGBT, zero current switching is achieved and turned off loss of switching elements is eliminated and by the voltage/second balancing of the inductor, zero voltage switching can be applied to switching element. Transformer coupling between battery cells and ZVZCT (Zero Voltage Zero Current Transition) switching method allow the fast balancing speed and high frequency operation, which reduces the size and weight of the circuit. The validity of the battery equalization is further verified using simulation involving four lithium-ion battery cell models.

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주권선 전류검출에 의한 단상유도전동기의 구동시스템 구현 (The Starting System Implementation of SPIM with Detecting Main Winding Current)

  • 최낙일;박수강;오금곤;백형래;임양수;오기진
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1997년도 전력전자학술대회 논문집
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    • pp.166-170
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    • 1997
  • A Single phase induction motor is the predominant fractional horsepower power rated, extensively used in domestic and industrial application. For example, these motors provide the motive power to washing machines, fans, refrigerators, etc. In this paper, single phase induction motor input current was detected by a small current transformer and determined TRIAC gate signal by using op-amp analog circuit. The soft-start strategy is based on limited auxiliary current angle during starting period in the closed-loop control. The Simulation and experimental result show the motor's starting characteristics of the proposal starting system and are compared with centrifugal switch starting motor.

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A Primary-Side-Assisted Zero-Voltage and Zero-Current Switching Three-Level DC-DC Converter

  • Jeon S. J.;Canales F.;Barbosa P. M.;Lee F. C.
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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    • pp.227-231
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    • 2001
  • A new primary-side-assisted zero-voltage and zero-current switching (ZVZCS) three-level DC-DC converter with flying capacitor is proposed. The three-level converters are promising in high voltage applications, and ZVZCS is a very effective means for reducing switching losses. The proposed DC-DC converter uses only one auxiliary transformer and two diodes to obtain ZCS for the inner leg. It has a simple and robust structure, and offers soft-switching capability even in short-switching conditions. The proposed converter was verified by experiments in a 6KW prototype designed for communication applications and operating at 100kHz.

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Analysis and Design of a Soft-Switched PWM Sepic DC-DC Converter

  • Kim, In-Dong;Kim, Jin-Young;Nho, Eui-Cheol;Kim, Heung-Geun
    • Journal of Power Electronics
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    • 제10권5호
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    • pp.461-467
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    • 2010
  • This paper proposes a new soft-switched Sepic converter. It has low switching losses and low conduction losses due to its auxiliary communicated circuit and synchronous rectifier operation, respectively. Because of its positive and buck/boost-like DC voltage transfer function (M=D/(1-D)), the proposed converter is desirable for use in distributed power systems. The proposed converter has versions both with and without a transformer. The paper also suggests some design guidelines in terms of the power circuit and the control loop for the proposed converter.

비접촉 전력전송방식을 이용한 엘리베이터 카 보조 전원시스템 (Elevator's Car Auxiliary Power System using the Contactless Power Transmission Method)

  • 임응규;노성찬;김수홍;김지민;김윤호
    • 조명전기설비학회논문지
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    • 제22권2호
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    • pp.80-84
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    • 2008
  • 본 논문은 다중권선의 비접촉 변압기를 이용한 비접촉 전력공급 방식을 제안한 논문이다. 논문에서 제안한 전력공급 방식은 엘리베이터 카에 신뢰성 높은 전력을 전송하기 위하여 공진주파수 추적 기법을 사용하였다. 제안된 시스템을 검증하기 위하여 ICAP4와 Maxwell을 사용하여 시뮬레이션을 수행하였으며, 5[kW]급 비접촉 전력전송시스템을 제작하여 실험을 수행하였다.

계통연계형인버터의 태양광발전시스템의 최대출력 제어법 (MPPT Method of Grid-connected Photovoltaic Inverter)

  • 김기현;유권종;정영석;김영석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 B
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    • pp.1293-1295
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    • 2001
  • Recently, according to developing industry and life style, power consumption have been increased year after year. Currently these much power demand from power consumer weakening the allowable power reverse margin in summer. As on of the remedies about this problem, the small scale grid-connected photovoltaic system is considered for auxiliary power source. Generally, grid-connected inverter have a isolation transformer for electrical isolation from utility. This paper proposed transformerless system topology an inquiry validity simulation.

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