| Author: | Cheung, Man-chi |
| Title: | Investigation and design of single-stage single-switch power factor corrected AC/DC converter |
| Degree: | M.Sc. |
| Year: | 2000 |
| Subject: | Analog-to-digital converters -- Design and construction Hong Kong Polytechnic University -- Dissertations |
| Department: | Multi-disciplinary Studies Department of Electronic and Information Engineering |
| Pages: | 134 leaves : ill. ; 30 cm |
| Language: | English |
| Abstract: | A new Single-stage Single-switch PFC (S4PFC) topology [6] is investigated. During the investigation of the PFC topology, some PFC basics [7] are studied and described. They include power factor, current harmonics definitions, international standard IEC1000-3-2 that is governing the necessity of PFC requirement and various popular PFC topologies. The popular PFC topology is indeed a two-stage converter, which doubled the convener size and hence increases the weight and cost. Such topology is inapplicable to some small-size, lightweight and cost-reduced applications, like notebook computer and light consumer products. One has found to modify the current two-stage PFC topology into a single-stage PFC for above reasons [1]. However, the side effect of the combined single-stage PFC results a very large variation of the storage capacitor voltage. This requires very high-voltage rating components to be used (i.e. 600V storage capacitor and 1000V MOSFET switch). Such topology is not really practical to implement the advantage of single-stage PFC topology. A new single-stage PFC topology is therefore investigated. It concentrates on solving the large capacitor voltage variation problem so that the single-stage PFC becomes practical and popular. By adding extra windings to the power transformer, the large voltage variation of the capacitor due to all load conditions is greatly reduced (i.e. < 400V in wide input range application). One has evaluated the topology performance by verifying the storage capacitor voltage using energy-balanced concept [1]. In the dissertation, such concept is used. The Energy-balanced equation is derived and solved by own means for the system evaluation. A design of power converter employing such new topology is also provided. The design is mainly based on the Energy-balanced equation to solve the system parameters (i.e. components values and component voltages / currents). They are determined by iterations of numerical method because of the implicit expression of the Energy-balanced equation. Some hardware testing results are obtained on a 50W (20V, 2.5A) S4PFC converter prototype. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b15177014.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.44 MB | Adobe PDF | View/Open |
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