High Efficiency and Low-Current Distortion Passive Power Factor Correction for Single-Phase Rectifiers

Name: Hang Sim

Organization : King Mongkut's University of Technology Thonburi. Faculty of Engineering. Electrical and Information Engineering

keyword: Voltage-Doubler Circuit

; Pi-Filter

Abstract: The equipment connected to an electrical distribution network usually needs some kind of power conditioning, typically rectification, which produces a nonsinusoidal line current due to nonlinear input characteristic. With the steadily increasing use of such equipment, the line current harmonics have become a significant problem and other significant issues are an efficiency of converter and output voltage ripple. They are discussed and investigated in this thesis. For the requirement of DC load, the topology AC/DC converter based on passive technique is developed and the advantage of this technique compares with its active technique such as reliability, simplicity, no switching loss, no EMI noise, and low-cost. The new AC/DC converter is proposed based on modified voltage doubler diode rectifiers and pi-filter with symmetric capacitors for single-phase rectifiers. The pi-filter with capacitor filters are inserted on the DC line between the modified voltage doubler diode rectifiers and load. The rectifiers operate in continuous conduction mode (CCM) to eliminate serious harmonic currents, typically, the third and the fifth harmonics which appear in the full wave rectifiers for single-phase. Furthermore, the pi-filter on DC side makes the behavior of equivalent DC load quasi-resistive for which the reactive power is suppressed. The proposed approach can achieve the uncontrolled single-phase voltage doubler diode rectifiers with continuous operation mode. Its operation principle is analyzed in detail under the steady-state using PSpice simulation and experiment. The design of component devices is obtained from a theoretical calculation and simulation analysis. As a result, high performance characteristics for simulating without parasitic such as low-current distortion and high efficiency are under 10 percent and around 96 percent, respectively, at the full load. This distortion is lower than the requirement of Class C equipment of the IEC/EN61000-3-2 standard. Moreover, unregulated output voltage with 5 percent of output voltage ripple is stable at maximum output power loading. However, the proposed method of prototype AC/DC converter with parasitic inductors provides high efficiency of converter around 90 percent and THD is kept good lower than 10 percent.

King Mongkut's University of Technology Thonburi

Address: Bangkok

Email: info.lib@mail.kmutt.ac.th

Name: Pinit Kumhom

Role: Advisor

Name: Kosin Chamnongthai

Role: Advisor

Created: 2006

Modified: 2010-12-19

Issued: 2552-02-13

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: ENE649

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Electrical and Information Engineering

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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