High power density and power factor cascade buck-boost PFC converter under high line input voltage = 높은 입력에서 높은 전력 밀도와 역률을 갖는 직렬 승강압형 역률 보상 컨버터

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In this paper, a control technique to achieve high power density and power factor (PF) under expanded high line input voltage using a cascade buck-boost PFC converter is proposed. Recently, the requirement of a $277 V_{AC}$ rather than a $230 V_{AC}$ has been increased in an AC distribution structures. The link voltage of conventional boost PFC converter is increased to 450 V under a $277 V_{AC}$ compared to the link voltage (400 V) under a $230 V_{AC}$ . Therefore, the volume of the link capacitor is also increased compared to the volume of a conventional link capacitor, which reduces the power density of the PFC stage. Moreover, the conventional boost PFC converter has a poor PF at the light load conditions due to the phase leading input current caused by the input capacitor. To overcome these problems, this paper proposes control techniques using a cascade buck-boost PFC converter in order to achieve a lower link voltage (400 V) under a voltage range of $180~305 V_{AC}$ . Therefore, a proposed technique uses a smaller link capacitor and achieves a high power density. Also, with a proper control of an additional switch $(Q_1)$, the phase leading input current can be relieved. Proposed techniques are explained and performance of the proposed technique is verified by prototype with 800 W conventional(450 V, 1.78 A)and proposed (400 V, 2.00 A).
Advisors
Moon, Gun-Wooresearcher문건우researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학부, 2016.8 ,[ii, 30 p. :]

Keywords

Link voltage; High power density; Light load PF; Cascade buck-boost PFC; High power factor; 서버용 전원장치; 277 VAC; 직렬 승강압형 컨버터; 높은 전력밀도; 높은 역률

URI
http://hdl.handle.net/10203/221716
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663439&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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