Novel Soft-Switching Bridgeless Power Factor Correction Circuits
Date Issued
2011
Date
2011
Author(s)
Tsai, Hsien-Yi
Abstract
Power factor correction (PFC) has become almost a must for off-line power applications nowadays. Despite intensive research in the past decade, this is still a hot-research topic among power electronic field because of the “green” push for the future electric power applications. About ten years ago, there was a PFC power-stage configuration named” Bridgeless” reported. In this configuration, the diode bridge conventionally used PFC applications can be removed and therefore resulting in lower conduction power loss for the applications. The main focus of this dissertation is about soft-switching “Bridgeless” PFC (BPFC) circuits which feature improved efficiency.
In the dissertation, three classes of soft-switching BPFC circuits are proposed. The first class is a zero-voltage transition BPFC in which an assistant circuit is used to achieve soft switching in the main power switches. However, the assistant switch is still turned off by hard switching. The second class is a zero-voltage zero-current BPFC circuit in which soft switching is achieved not only for the main switches but also for the assistant switch. And the third class is an extension of the first class to a three-phase PFC circuit. Different circuit variations are also proposed to the above three classes.
Computer simulations and experimental results are presented in the dissertation. Design guidance is also included. Improvements of efficiencies, compared to conventional hard-switching circuits are in the range of one to two percentage points which is a significant improvement.
Subjects
bridgeless
ZVS
soft switching
converter
power factor correction
Type
thesis
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