TY - GEN
T1 - A novel transformer-less interleaved four-phase high step-down DC converter with low switch voltage stress
AU - Pan, Ching Tasi
AU - Chuang, Chen Feng
AU - Chu, Chia Chi
AU - Cheng, Hao Chien
PY - 2014
Y1 - 2014
N2 - In this paper, a novel transformer-less interleaved four-phase high step-down conversion ratio dc-dc converter with low switch voltage stress is proposed. In the proposed converter, the new capacitors switching circuits are combined with interleaved four-phase buck converter in order to get a high step-down conversion ratio without adopting an extreme short duty ratio. Based on the capacitive voltage division, the main objectives of the capacitors switching circuits in the converter are both storing energy in the blocking capacitors for increasing the voltage conversion ratio and reducing voltage stresses of active switches. This will allow one to choose lower voltage rating MOSFETs to reduce both switching and conduction losses, and the overall efficiency is consequently improved. In addition, due to the charge balance of the blocking capacitor, the converter features automatic uniform current sharing characteristic of the interleaved phases without adding extra circuitry or complex control methods. The operating principle and steady-state analyses of the voltage gain are discussed. Finally, a 400-V input voltage, 24-V output voltage, and 500W output power prototype circuit is implemented in the laboratory to verify the performance.
AB - In this paper, a novel transformer-less interleaved four-phase high step-down conversion ratio dc-dc converter with low switch voltage stress is proposed. In the proposed converter, the new capacitors switching circuits are combined with interleaved four-phase buck converter in order to get a high step-down conversion ratio without adopting an extreme short duty ratio. Based on the capacitive voltage division, the main objectives of the capacitors switching circuits in the converter are both storing energy in the blocking capacitors for increasing the voltage conversion ratio and reducing voltage stresses of active switches. This will allow one to choose lower voltage rating MOSFETs to reduce both switching and conduction losses, and the overall efficiency is consequently improved. In addition, due to the charge balance of the blocking capacitor, the converter features automatic uniform current sharing characteristic of the interleaved phases without adding extra circuitry or complex control methods. The operating principle and steady-state analyses of the voltage gain are discussed. Finally, a 400-V input voltage, 24-V output voltage, and 500W output power prototype circuit is implemented in the laboratory to verify the performance.
KW - Low switch voltage stress
KW - high step-down converter
KW - uniform current sharing characteristic
UR - http://www.scopus.com/inward/record.url?scp=84906673710&partnerID=8YFLogxK
U2 - 10.1109/IPEC.2014.6869981
DO - 10.1109/IPEC.2014.6869981
M3 - 会议稿件
AN - SCOPUS:84906673710
SN - 9781479927050
T3 - 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
SP - 3379
EP - 3385
BT - 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
PB - IEEE Computer Society
T2 - 7th International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
Y2 - 18 May 2014 through 21 May 2014
ER -