New generation UPS technology, the delta conversion principle

Harmonics, low power factor and high energy waste from traditional double conversion uninterruptible power systems (UPS) are becoming of increasing concern to electric utility engineers and operators of such UPS systems. Actually, today many UPSs are not being viewed as solutions, but rather as culprits. This paper introduces a new, line-interactive, online UPS technology that eliminates harmonic input current distortion, provides unity controlled power factor and saves energy. The paper gives a brief overview of the traditional double-conversion UPS as well as the causes and consequences of the problems associated with this topology. Then the line-interactive, single conversion UPS topology with its advantages is reviewed. Next the new delta conversion UPS topology is presented and discussed in detail showing further advantages. Finally a performance comparison of all three types of UPS technology is made.