Three-phase UPS Topology and Efficiency Enhancement

Document ID:
WP0001_en-us

Document Author:
Liao Jen-chuan / Kuo chao-lung
Delta Electronics, Inc.

Abstract:
The development of Taiwan's electronic science & technology and semiconductor industry witnesses increasingly higher requirements on the quality of power supply to precision instruments and equipment necessary for manufacturing processes, thus driving the demand for large capacity three-phase UPS systems. In the context of energy crisis and greenhouse effect, how to raise UPS operating efficiency and reduce energy consumption and operation costs has become an important issue faced by UPS vendors. Therefore, this paper, starting from introducing topologies of three-phase UPS systems, describes the method for improvement of UPS efficiency based on comparison of PFC and inverter topologies, optimization of control methods, selection of key components & assemblies, and operation of highly efficient ECO mode. Meanwhile, it also makes a brief introduction about the current international regulations on UPS efficiency.

Product covered:
Three-phase UPS