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UBC Theses and Dissertations

High efficiency single-phase power factor correctors : resonant circuit and flexible topology Valipour, Hamed


Rectifiers with Alternating Current (AC) input and Direct Current (DC) output are required in many applications to regulate the output and provide a Power Factor Correction (PFC) capability. There are different applications for PFC rectifiers: wide-range and narrow-range. The purpose of this work is to propose two approaches to improve efficiency while keeping the performance high in both wide and narrow range rectifiers. Wide-range applications require PFC converters to support extended ranges of variations in the input voltage. A PFC converter capable of coping with a wide input voltage range, 90VRMS -530VRMS, would significantly decrease costs and streamline development. In this work, a reconfigurable PFC converter is proposed which provides a high and flat efficiency curve throughout the entire operating voltage range. The proposed reconfigurable converter has a flexible bridgeless structure with simple control, low current ripples, low common-mode noise, and startup inrush current handling capabilities. Narrow-range applications are also studied in this work which do not require a wide range of variations in their input. An advanced LLCC resonant structure is proposed in this work which improves the efficiency in narrow-range applications. The operation of this proposed concept is first developed in a switching-time scale and tested in a DC/DC environment, then a modified version is used with an AC input and bridgeless configuration. This converter can provide soft switching for all of the semiconductors without adding extra elements, by just using the passive components in the design as resonant tank. Therefore, the efficiency can be improved which potentially results in lower sizes for the passive elements. This converter can also provide a continuous input current despite using small inductances. This enables an inherent PFC capability with a single loop control architecture in the AC/DC version. This structure has a simple and symmetrical structure with easy control. The proposed converters in this work are theoretically and experimentally analyzed. Their performance is also compared iii with conventional structures. The proposed converters show efficiency improvements as well as better performance in this comparison.

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