In this paper, a new zero voltage switching(ZVS) UPS topology which consists of switch mode rectifier(SMR), resonant DC link inverter(RDCLI) and auxiliary circuit is proposed. The auxiliary circuit provides zero voltage switching condition for all switches of SMR and inverter. SMR is controlled with almost unity power factor. With syncronization between SMR and inverter, ZVS commutation period can be reduced. Thus high power factor, high efficiency UPS is realized. Operation and control are described and verified by experiment.
