Modeling, Analysis, and Implementation of a Power Converter with Integrated Magnetics, Low Ripple, and Parallel Configuration
Date Issued
2005
Date
2005
Author(s)
Chen, Rong-Tai
DOI
en-US
Abstract
The major purposes of this dissertation are to perform circuit design, dynamic modeling, control and multi-module operation analysis for DC-DC converters. This dissertation presents a novel single stage push-pull boost converter with a improved integrated magnetics and ripple-free input current. First, most of the reported single-stage power factor corrected (PFC) rectifiers cascade a boost-type converter with DC-DC converter. It is found that the push-pull converter with the duty cycles greater than 50% can simplify the front of boost-type converter to a novel single stage converter. Secondly, coupled inductor techniques provide a method to reduce the converter size and weight, and achieve low ripple current. All the magnetic components including input filter inductor and step-down transformer are integrated into a single EI core. The proposed integrated magnetics structure has a simple core structure, a small leakage inductance and low core losses. The prototype is built to demonstrate the theoretical prediction.
Finally, the design and implementation of a multi-module parallel push-pull converter system is presented. In parallel operations, a master-slave current control technique is proposed to compensate the mismatch in current control characteristics of each parallel converter. The small-signal equivalent circuit and transfer function model of the multi-module converter system are found. Then the model reductions are performed using the concept of dominant energy mode. Based on the reduced converter model, a PI controller is quantitatively designed according to the prescribed regulating specifications. A three-module control scheme is proposed. The performance of the converter and the effectiveness of the proposed controller are demonstrated by some simulation and experimental results.
Subjects
電力換流器
整合式鐵心
主僕式
power converter
integrated magnetics
master-slave
Type
thesis
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