Multiphase Low Stresses High Step-Up DC-DC Converter With Self-Balancing Capacitor Voltages and Self-Averaging Inductor Currents

Voltage gain ratio is a key limitation faced by nonisolated dc-dc converters in practical applications. Low voltage and current stresses, small volume, simple sampling control circuit, low cost, suitability for high power, scalability, and modularization are optimization trends of the dc-dc converte...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2022-06, Vol.37 (6), p.6913-6926
Main Authors: Wang, Fan, Wang, Yubin, Dong, Zheng, Wang, Shenhong
Format: Article
Language:English
Subjects:
Balancing
Capacitors
Ceramic capacitors
Circuits
Distributed generation
Electric vehicles
Energy storage
Fuel cells
High step-up converter
Inductors
low capacitor and switching stresses
Low voltage
Mathematical models
Multiphase
multiphase bidirectional dc–dc converter
Optimization
self-averaging inductor currents
self-balancing capacitor voltages
Storage systems
Stress
Stresses
Switches
Switching
Topology
Voltage control
Voltage converters (DC to DC)
Voltage gain
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Summary:Voltage gain ratio is a key limitation faced by nonisolated dc-dc converters in practical applications. Low voltage and current stresses, small volume, simple sampling control circuit, low cost, suitability for high power, scalability, and modularization are optimization trends of the dc-dc converter design. To improve the above-mentioned performance, a multiphase high step-up dc-dc converter is proposed, with advantages of high voltage gain, low switching voltage stresses, low switching current stresses, low capacitor voltage stresses, low output voltage ripple, capacitor voltages self-balancing feature, inductor currents self-averaging feature, ease of extension, and being able to be modularized. The topology derivation, comparisons with other high step-up converters, the operating principle, characteristics, and mathematical models of the proposed converter are studied in detail. Finally, a laboratory prototype of the proposed dc-dc converter operating from 400 to 800 W is built and implemented with input being 24 V and output being 400 V. The experimental results verify the feasibility and superiority of the proposed converter. The proposed multiphase high step-up converter is suitable for the applications, such as fuel cells, electric vehicles, energy storage systems, photovoltaic systems, and microgrids.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3133613