Cascaded Dual-Buck AC-AC Converter With Reduced Number of Inductors

This paper proposes a new type of cascaded ac-ac converter with phase-shift control and reduced number of inductors. It can attain high voltage levels by using standard low-voltage rating semiconductor devices. The proposed converter is resistant to current shoot-through and does not require pulse-w...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-10, Vol.32 (10), p.7509-7520
Main Authors: Khan, Ashraf Ali, Honnyong Cha, Ju-Won Baek, Juyong Kim, Jintae Cho
Format: Article
Language:English
Subjects:
AC–AC converter
cascade
Commutation
Converters
dual-buck
Electric potential
Electronics
high voltage level
Inductors
Inverters
Logic gates
MOSFET
multilevel
Passive components
Phase shift
Polarity
Pulse duration modulation
Pulse width modulation
Reliability
Semiconductor devices
Snubbers
System reliability
Voltage control
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Description
Summary:This paper proposes a new type of cascaded ac-ac converter with phase-shift control and reduced number of inductors. It can attain high voltage levels by using standard low-voltage rating semiconductor devices. The proposed converter is resistant to current shoot-through and does not require pulse-width modulation (PWM) dead-time; these lead to greatly enhanced system reliability and effective utilization of PWM voltages. Moreover, it does not require current/voltage polarity sensors, lossy snubbers, or dedicated PWM strategies for commutation. These features make it possible to design the converter with reduced control complexity, and obtain output voltage with less distortion. The cascaded units in the proposed converter share the inductors; therefore, number of inductors, inductors footprints, and magnetic volume can be reduced. The phase-shift PWM control is also presented. It increases the effective frequency of the converter by the number of cascaded units, which decreases the size of the passive components and/or the current and voltage ripples. In order to demonstrate the advantages of the proposed converter, detailed comparative simulations and experimental results of the proposed 2-unit, 3-unit, and 4-unit cascaded converters are provided.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2636228