- Forward, flyback converter

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Presentation transcript:

- Forward, flyback converter Isolated converters - Forward, flyback converter

Contents Isolation and transformer Buck type isolated converter – forward converter Buck-boost type isolated converter – flyback converter

< Product, structure, simplified model of transformer > Isolation and transformer Isolated converters 입력단과 출력단의 절연을 통한 안전성 확보 기본 컨버터의 동작 응용을 통한 이해 Transformer < Product, structure, simplified model of transformer > 자성 코어를 이용한 변압기로 절연 제공 권선비 조절을 통한 승-감압비 조절 기본 컨버터에 적용  절연 컨버터 Buck type – forward, half bridge, full bridge converter Buck-boost type – flyback converter

Buck type isolated converter Forward converter Forward converter – buck with transformer Buck converter와 동작 유사 Q on – Lo build up, Q off – Lo freewheel Vo = (Ns/Np)DVin Reset circuit – RCD snubber RCD snubber – 일반적 클램프 회로 자화, 누설 인덕터의 에너지를 연소 변압기 리셋, 스위치 피크 전압 억제

Buck type isolated converter RCD clamp forward converter – mode analysis

Buck type isolated converter RCD clamp forward converter – mode analysis

Buck type isolated converter Other buck type isolated converters Half bridge converter Full bridge converter

Buck-boost type isolated converter Flyback converter Flyback converter – buck with transformer Buck-boost inductor  transformer Transformer가 인덕터의 역할을 대신함 Buck-boost converter와 동작 유사 Vo = (Ns/Np)*D/(1-D)*Vin Clamp circuit – RCD snubber 스위치 피크 전압 억제 위한 회로 누설 인덕터의 에너지를 연소

Buck-boost type isolated converter Flyback converter with RCD clamp snubber – mode analysis