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A zero-voltage-switching (ZVS) push-pull DC/DC converter for UPS

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4 Author(s)
Jianping Ying ; Delta Power Electron. Center, Shanghai, China ; Qiuhua Zhu ; Hua Lin ; Zhigan Wu

This paper presents a control scheme that is very suitable for the DC/DC converter in uninterruptible power supply (UPS) systems. Based on this control scheme, a ZVS push-pull converter is proposed. With heavy load, or during the latter stage of battery discharge with light load, the DC/DC converter will operate with duty cycle fixed to near 0.5, thus the primary switches of the push-pull converter can operate under ZVS condition with the help of transformer magnetizing current. Based on the ZVS commutation and double switching frequency, magnetic core of DC/DC transformer in online 3 kVA UPS of Delta Company is reduced from two pairs to one pair of EE55. And the efficiency of improved ZVS push-pull converter can be kept the same level as original hard switching push-pull converter in spite of double switching frequency.

Published in:

Power Electronics and Drive Systems, 2003. PEDS 2003. The Fifth International Conference on  (Volume:2 )

Date of Conference:

17-20 Nov. 2003