The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Reduction of Conducted Emission in Interleaved RPWM Buck Converter

인터리브드 RPWM Buck 컨버터의 전도성 노이즈 감소에 대한 연구

  • Lee, Seunghyun (Departmemt of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Lee, Keunbong (SK Hynix) ;
  • Nah, Wansoo (Departmemt of Electrical and Computer Engineering, Sungkyunkwan University)
  • 이승현 (성균관대학교 전자전기컴퓨터공학과) ;
  • 이근봉 (SK 하이닉스) ;
  • 나완수 (성균관대학교 전자전기컴퓨터공학과)
  • Received : 2017.02.14
  • Accepted : 2017.04.11
  • Published : 2017.04.30
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Abstract

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.

본 논문에서는 DC-DC Converter에서의 고조파로 인한 전자기적 잡음을 줄이기 위해 Random PWM을 적용한 Interleaved Buck Converter(IBC) 시스템을 제안한다. PWM 직류전원장치에서 스위칭 방식을 사용하는 경우 스위칭 손실 및 EMI 문제가 발생하기 때문에 많은 고조파를 포함하고 있어 선간 전압의 왜곡 등을 유발한다. 따라서 이에 대한 해결방법으로 PRBS를 이용한 IBC를 최초로 제안한다. 이 방식의 회로 구조는 2개의 능동형 스위치를 가지며 180도의 위상차를 갖는 2개의 PWM 신호를 이용하여 회로를 제어한다. IBC는 1세트의 스위치를 추가하기 때문에, 비용 측면 등에서는 불리 할 수 있으나 전력분배, 출력전류 리플 감소, 빠른 회로 반응속도, 수동소자크기 감소의 이점을 가진다. 본연구의 타당성을 확인하기 위하여 PSIM 시뮬레이터를 이용하였고 Random PWM을 적용한 IBC 회로를 설계하여 기존의 PWM과 RPWM 방식만을 사용하는 Buck-converter 회로를 PSIM 시뮬레이터를 이용하여 결과를 확인하고 분석하였다.

Keywords

References

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