Study on high-efficiency, low cost, and high power density on-board charger system using center-tapped clamping voltage-source circuit = 센터탭 클램핑 전압원 회로를 이용한 고효율, 저비용, 고밀도 전기자동차용 차량 탑재형 충전기

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In this dissertation, a new clamp circuit, which consists of two diodes and one capacitor, is proposed. With this very simple structure, the proposed clamp circuit can solve many limitations in conventional phase-shifted full-bridge (PSFB) converters, so that high efficiency, low cost, and high power density are achieved in electric-vehicle battery charger applications. The proposed center-tapped clamp circuit provides the clamping path and allows the secondary voltage stress to be clamped to the secondary-reflected input voltage. This results in a greatly reduced conduction loss in the secondary full-bridge rectifier (FBR) due to the low forward-voltage drop of low voltage-rated diodes. In addition, the circulating current in the primary side is removed without any duty-cycle loss. Furthermore, the turn-off switching loss in the FBR is substantially reduced due to the decreased reverse-recovery current and the reduced reverse voltage. With these advantages, high efficiency can be achieved. Besides, the size of the output inductor is considerably reduced with the aid of clamping voltage, resulting in a high power density with saving the cost. In order to confirm the effectiveness of the proposed converter, a 3.3-kW prototype was tested. Experimental results show that the proposed converter achieves high efficiency over the entire conditions.
Advisors
Moon, Gun-Wooresearcher문건우researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학부, 2019.8,[vi, 94 p. :]

Keywords

circulating current▼aclamp circuit▼aelectric-vehicle▼aon-board battery charger▼aphase-shifted full-bridge converter▼azero-voltage switching; 순환 전류▼a클램프 회로▼a전기 자동차; 차량 탑재형 배터리 충전기▼a위상 천이 풀-브릿지 컨버터 a영-전압-스위칭

URI
http://hdl.handle.net/10203/283286
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=871460&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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