Design and Implementation of Digitally Controlled Boost PFC Converter Under Boundary Conduction Mode
| Autor: | Nguyen Binh Nam |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The use of power factor correction (PFC) converters is widely discussed and considered for most off-line power supplies. The aim of the power factor correction (PFC) converter is to shape the input current to minimize the reactive power. For low power applications, boost PFC converter operated in discontinuous conduction mode (DCM) or boundary conduction mode (BCM) is usually employed. The advantages of PFC operating with BCM are the reduction of reversal recovery loss of diode and the simple control. In this thesis, a digital-controlled method for boost PFC operating under BCM without input voltage sensing is proposed. For this proposed control method, the digital voltage PI controller is used for determined the constant on-time period and the comparator block inside the DSP is used to detect the zero-crossing of inductor current for turning on the main switch. A 200W boost PFC prototype is implemented and tested to verify the feasibility of the proposed control scheme. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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