Lossless Commutated Boost Converter applied as a PFC Stage for Uninterruptible Power Supply System without Battery Charger

A lossless commutated boost converter applied as an active PFC stage for uninterruptible power supply (UPS) systems is presented in this paper. In this new PFC topology, as the stored commutation energy is delivered to the battery set, a suitable design can be made to avoid the use of a battery charger, therefore, eliminating an additional power stage commonly found in ordinary boost converter structures applied as an active PFC stage for UPS. Thus, one can conclude that a suitable design can provide autonomous UPS systems. Detailed experimental results are presented corroborating with simulations analysis also included in this work. The proposed structure presents good performance, becoming a good candidate for PFC stage of on-line UPS structures. Mathematical analysis and a complete description of the proposed topology operation are also presented.