TY - JOUR
T1 - A new concept of high-voltage dc-dc conversion using asymmetric voltage distribution on the switch pairs and hybrid ZVS-ZCS scheme
AU - Wang, Huai
AU - Chung, Henry Shu Hung
AU - Ioinovici, Adrian
N1 - Funding Information:
Manuscript received December 31, 2010; revised August 17, 2011; accepted October 11, 2011. Date of current version February 27, 2012. This work was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No: CityU 112406). This paper was presented in part at the IEEE Energy Conversion Congress and Exposition, Atlanta, Georgia, September 12–16, 2010, and at the IEEE Applied Power Electronics Conference and Exposition, Fort Worth, Texas, March 6–10, 2011. Recommended for publication by Associate Editor M. Vitelli.
PY - 2012
Y1 - 2012
N2 - A new concept of high-voltage dc-dc power conversion is presented in this paper. Its distinctive feature lies in distributing the high input voltage asymmetrically between two primary-side series-connected switch pairs. This allows using switches of optimal ratings in their respective class: the low-voltage switch pair implemented with MOSFETs only, and the high-voltage switch pair implemented with insulated gate bipolar transistors (IGBTs) only. As the switches in a switch pair are of the same type and voltage rating, they are maximally utilized. With an active snubber on the secondary side of the isolation transformer, a hybrid zero-voltage-switching-zero-current-switching (ZCS) scheme, which is different from the zero-voltage and zero-current- switching technique, is realized and makes all IGBTs be zero-current-switched and all MOSFETs be zero-voltage-switched from very light load to full load condition with minimal circulating energy. The ZCS snubber energy is completely released to the load, leading also to a duty-cycle gain. The operating principles, dc analysis, and design guidelines will be given. A 2-kW, 1500/48-V experimental prototype has been built and evaluated. The measured efficiency of the converter is found to be 92.4% at the rated condition.
AB - A new concept of high-voltage dc-dc power conversion is presented in this paper. Its distinctive feature lies in distributing the high input voltage asymmetrically between two primary-side series-connected switch pairs. This allows using switches of optimal ratings in their respective class: the low-voltage switch pair implemented with MOSFETs only, and the high-voltage switch pair implemented with insulated gate bipolar transistors (IGBTs) only. As the switches in a switch pair are of the same type and voltage rating, they are maximally utilized. With an active snubber on the secondary side of the isolation transformer, a hybrid zero-voltage-switching-zero-current-switching (ZCS) scheme, which is different from the zero-voltage and zero-current- switching technique, is realized and makes all IGBTs be zero-current-switched and all MOSFETs be zero-voltage-switched from very light load to full load condition with minimal circulating energy. The ZCS snubber energy is completely released to the load, leading also to a duty-cycle gain. The operating principles, dc analysis, and design guidelines will be given. A 2-kW, 1500/48-V experimental prototype has been built and evaluated. The measured efficiency of the converter is found to be 92.4% at the rated condition.
KW - DC-DC power conversion
KW - high input voltage
KW - soft switching
UR - http://www.scopus.com/inward/record.url?scp=84863279094&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2011.2173588
DO - 10.1109/TPEL.2011.2173588
M3 - Article
AN - SCOPUS:84863279094
SN - 0885-8993
VL - 27
SP - 2242
EP - 2259
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 5
M1 - 6060920
ER -
