A Single-Phase Buck Matrix Converter With High-Frequency Transformer Isolation and Reduced Switch Count

In this paper, a new type of matrix converter (MC) also called a single-phase high-frequency transformer isolated (HFTI) buck MC is proposed. The proposed converter can provide step-down operation of the input voltage with various types of output voltages such as in-phase and out-of-phase output vol...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2017-09, Vol.64 (9), p.6979-6988
Main Authors: Ahmed, Hafiz Furqan, Honnyong Cha, Khan, Ashraf Ali
Format: Article
Language:English
Subjects:
Capacitors
Circuit faults
Commutation
Electric potential
High-frequency transformer (HFT)
in-phase and out-of-phase operations
Inductors
Input output
Matrix converters
Passive components
Phase transitions
rectified output
single-phase matrix converter (MC)
step-changed frequency
Switches
Switching circuits
Transformers
Voltage control
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Summary:In this paper, a new type of matrix converter (MC) also called a single-phase high-frequency transformer isolated (HFTI) buck MC is proposed. The proposed converter can provide step-down operation of the input voltage with various types of output voltages such as in-phase and out-of-phase output voltages, rectified (or positive) output voltage, and output voltage with step-changed frequency. By incorporating HFT isolation, the proposed MC saves an extra bulky line frequency transformer, which is required for the conventional MCs to provide electrical isolation and safety, when used in application such as dynamic voltage restorers, etc. Two different circuit variations of the proposed HFTI MC are presented with and without continuous output currents, with the latter having less passive components. The safe-commutation strategy is also employed for the proposed HFTI MC to provide current path for the inductor during dead-time, which avoids switch voltage spikes without adding any snubber circuits. The operation principle and circuit analysis of the proposed MC are presented, and switching strategies are also developed to obtain various output voltages. Moreover, a prototype of the proposed MC is fabricated, and experiments are performed to produce in-phase/out-of-phase and rectified output voltages, and output voltage with step-changed frequency.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2686329