Title :
A zero-voltage-switching (ZVS) push-pull DC/DC converter for UPS
Author :
Ying, Jianping ; Zhu, Qiuhua ; Lin, Hua ; Wu, Zhigan
Author_Institution :
Delta Power Electron. Center, Shanghai, China
Abstract :
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.
Keywords :
DC-DC power convertors; battery chargers; magnetic cores; power transformers; switching circuits; transformer magnetic circuits; uninterruptible power supplies; 3 kVA; UPS; ZVS; ZVS commutation; battery discharge; double switching frequency; magnetic core; primary switches; push-pull DC-DC converter; transformer magnetizing current; uninterruptible power supply; zero-voltage-switching; Batteries; Control systems; DC-DC power converters; Magnetic cores; Magnetic switching; Switches; Switching converters; Switching frequency; Uninterruptible power systems; Zero voltage switching;
Conference_Titel :
Power Electronics and Drive Systems, 2003. PEDS 2003. The Fifth International Conference on
Print_ISBN :
0-7803-7885-7
DOI :
10.1109/PEDS.2003.1283206
