A 600-W Four-Stage Phase-Shifted-Parallel DC-to-DC Converter

Shortt, D.J.; Michael, W.T.; Avant, Roger L.; Palma, Roberto

doi:10.1109/tpel.1987.4766344

Cited by 18 publications

(2 citation statements)

References 9 publications

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“…To increase their efficiency and to further increase the switching frequency while reducing the size, cost, and electromagnetic interference problems, soft-switching techniques [4]- [15] will be used in this paper. Due to the high power requirement, an interleaved multicell configuration [16]- [18] that uses three cells (each rated at 2.4 kW) in parallel (both at the input and output) with each cell being phase shifted by 120 • ( = 360 • /3) is adopted. Each cell shares equal power and the thermal losses are distributed uniformly among the cells.…”

Section: Specifications and Possible Converter Configurationsmentioning

confidence: 99%

A Comparison of Soft-Switched DC-to-DC Converters for Electrolyzer Application

Gautam

Bhat

2013

IEEE Trans. Power Electron.

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An electrolyzer is part of a renewable energy system and generates hydrogen from water electrolysis that is used in fuel cells. A dc-to-dc converter is required to couple the electrolyzer to the system dc bus. This paper presents the design of three soft-switched high-frequency transformer isolated dc-to-dc converters for this application based on the given specifications. It is shown that LCL-type series resonant converter (SRC) with capacitive output filter is suitable for this application. Detailed theoretical and simulation results are presented. Due to the wide variation in input voltage and load current, no converter can maintain zero-voltage switching (ZVS) for the complete operating range. Therefore, a two-stage converter (ZVT boost converter followed by LCL SRC with capacitive output filter) is found suitable for this application. Experimental results are presented for the two-stage approach which shows ZVS for the entire line and load range.Index Terms-DC-to-DC converters, electrolyzer, renewable energy system (RES), resonant converters.

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Section: Specifications and Possible Converter Configurationsmentioning

confidence: 99%

A Comparison of Soft-Switched DC-to-DC Converters for Electrolyzer Application

Gautam

Bhat

2013

IEEE Trans. Power Electron.

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“…On the other hand, the modular design takes advantage of standard manufacturing processes leading to a lower product cost. Moreover, the system reliability and performance can be improved by fault detection and properly switching the connected modules [5]- [9].…”

Section: Introductionmentioning

confidence: 99%

Parallel operation of modular power factor correction circuits

Moo

Cheng²,

Lin³

2002

IEEE Trans. Power Electron.

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The parallel operation of modular power factor correction circuits is illustrated. The modular units using boost converters are operated at a constant frequency with variable dutyratio. Flexible load demand is met by changing the number of operating modules under the maximum current limit. The operating modules have the same frequency and duty-ratio, but are equally phase-shifted to each other by a fraction of the switching period to reduce the ripple content and to increase the ripple frequency of the input current. With this phase-shifted control strategy, balanced current sharing among modules can be achieved by operating the boost converters at discontinuous current mode, without the need of extra current control circuit. A prototype circuit consisting of 15 modular units, which supply the attempted power rating of 3.75 kVA was implemented to verified the theoretical prediction.

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