|Author:||Venkata, Murali S|
|Title:||Analysis of single-phase single-stage power-factor-corrected switching converters|
|Subject:||Electric current converters|
Electric power factor
Hong Kong Polytechnic University -- Dissertations
|Department:||Department of Electronic and Information Engineering|
|Pages:||xvi, 117 leaves : ill. ; 30 cm|
|Abstract:||The distorted input-current waveforms of nonlinear electronic loads cause interference and lead to poor utilization of the utility power system. This is rapidly becoming a serious problem due to the wide proliferation of electronic loads. Input-current shaping or power-factor-correction (PFC) addresses the techniques of reducing the distortion of input-current waveforms drawn from the power line. There are many methods of input-current shaping. This thesis focuses on the analysis and comparison of single-stage cascaded switching power converters which can provide simultaneous power factor correction and tight output-voltage regulation. The study begins with a detailed review of the concept of power factor and the methods of input-current shaping. At the reviewing stage, the automatic PFC is chosen as the subject of the thesis. Topologically there are many ways of realizing automatic PFC. After a detailed comparison between two-switch and single-switch cascaded topologies, the single-switch cascaded version is identified as a suitable candidate for low-power applications. All possible topologies based on pure cascade of the basic second-order converters are derived by using the grafted tree technique. A new buck based topology which is not based on the pure cascade is also derived. Some existing and new rules are used for determining whether a particular cascaded converter is suitable for use as a PFC regulator. Then, the converters which are found suitable are compared against their RMS, peak and average diode, inductor and switch currents. Small-signal dynamical analysis of some well known cascaded converters are also studied in detail. The results from small-signal analysis provide important insights into the dynamics of cascaded PFC converters, which have not been reported in the power electronics literature.|
|Rights:||All rights reserved|
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item: