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Abstract: A new method for the current ripple reduction of a 3-phase interleaved bidirectional DC-DC converter is proposed. A 3-phase interleaved bidirectional DC-DC converter is widely used for the battery application system. The converter can provide the reduction of the battery current ripple component by the 3-phase interleaved operation.
However, the analysis in this paper shows that the ripple current magnitude can be reduced more by 2-phase interleaved operation in a special battery voltage range.
The converter used in this paper operates in discontinuous mode to minimize the switching losses. All the switches are turned on at ZVS and ZCS condition, and turned off at ZVS condition.
The number of the capacitors connected to the switches in parallel to provide ZVS is 50[%] compared with that in conventional 3-phase bidirectional DC-DC converter.
The charging and discharging power of the battery is controlled by varying the switching frequency maintaining discontinuous mode operation.
3kW, 20kHz power converter is designed and implemented. Simulation and experimental results show the validity of the proposed method. It is expected that the proposed control method can be used to reduce the battery ripple current significantly.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/12757
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002237204

Table Of Contents: 1. 서 론 1
2. 양방향 DC-DC 컨버터 6
2-1. 시스템 구성 6
2-2. 주파수 가변 스위칭 기법 8
2-2-1. 배터리 충전 동작원리 8
2-2-2. 상 제어 시 배터리 충전전력과 주파수 14
2-2-3. 배터리 방전 동작원리 21
2-2-4. 상 제어 시 배터리 방전전력과 주파수 27
2-3. 전류 리플 저감을 위한 새로운 제어 기법 33
2-3-1. 3상 동작 시 전류 리플 크기분석 33
2-3-2. 2상 동작 시 전류 리플 크기분석 36
2-3-3. 상 전환 적용구간 분석 39
2-4. 시스템 설계 41
3. 시뮬레이션 43
3-1. 시뮬레이션 구성 43
3-2. 시뮬레이션 결과 45
4. 실험 51
4-1. 실험 하드웨어 구성 51
4-2. 실험 결과 52

5. 결 론 64

참 고 문 헌 66

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