Two-Stage Factorized Power Architecture DC-DC Converter for Spacecraft Secondary Power Supply System

In this article, we propose a two-stage factorized power architecture (FPA) dc-dc converter, which caters to applications that require high efficiency, high power density, low ripple, and high dynamic response of space-borne low-voltage and high-current power supply. The first-stage 48 V intermediat...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2022-10, Vol.10 (5), p.5392-5413
Main Authors: Wang, Lei, Zhang, Donglai, Yang, Yugang, Li, Hongzhu
Format: Article
Language:English
Subjects:
Buck converters
Circuit design
Current sharing
Design optimization
Dynamic response
Efficiency
Electric potential
Electric power supplies
high efficiency and high-power density
Inductors
interleaving magnetic integration
low-voltage and high-current
Magnetic circuits
Magnetic resonance
Magnetic switching
Power supplies
Power supply
Power system measurements
Ripples
satellite power supply
Transformers
Transient response
Voltage
Voltage converters (DC to DC)
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Summary:In this article, we propose a two-stage factorized power architecture (FPA) dc-dc converter, which caters to applications that require high efficiency, high power density, low ripple, and high dynamic response of space-borne low-voltage and high-current power supply. The first-stage 48 V intermediate bus converter (IBC) adopts the six-phase interleaving magnetic integration buck converter (IMIBC). A new array high symmetry multi-phase coupled inductor (CI) is constructed, and a general zero-voltage switching (ZVS) control strategy is proposed. The designed IBC provides 2.4 kW power with a density of up to 1400 W/in3 and efficiency up to 97.15%. The second-stage point of load converter (POLC) adopts the four-phase interleaving magnetic integration LLC dc/dc transformer (DCX). A new method of current sharing, which is based on the inverse coupling resonant inductor, is proposed. This method yields good current sharing under a 15% mismatch of resonance parameters. A highly symmetrical four-phase resonant CI and a four-phase magnetic integration transformer are developed; the design of magnetic components is optimized by constructing a high-precision magnetic circuit mode. The designed POLC has a power density of up to 700 W/in3 and an efficiency of up to 97.1%. Finally, the experimental prototype is fully tested against a similar type of Vicor's products. According to the results, the power supply designed in this article has several benefits with regard to efficiency, power density, transient response speed, and ripple.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2022.3140431