Experimental evaluations of a five-element multi-resonant DC-DC converter with an improved PFM control range

Mishima, Tomokazu; Mizutani, Hiroto; Nakaoka, Mutsuo

doi:10.1109/peds.2013.6527005

Cited by 8 publications

(6 citation statements)

References 5 publications

(3 reference statements)

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“…Almost the same holds for other types of resonant converters e.g. quasi-resonant converters [6], [7], multiresonant converters [8] - [9], and so on. Moreover, the frequency modulation, mostly used for controlling these converters, is disadvantageous due to EMI suppressing.…”

Section: Introductionmentioning

confidence: 71%

ZVZCS PWM DC-DC Converter with Controlled Secondary Rectifier for ARC Welding

Dudrik

Pastor²,

Lacko³

et al. 2016

AEI

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Section: Introductionmentioning

confidence: 71%

ZVZCS PWM DC-DC Converter with Controlled Secondary Rectifier for ARC Welding

Dudrik

Pastor²,

Lacko³

et al. 2016

AEI

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“…The relevant papers [22]- [24] have verified the buck and boost voltage regulations of the proposed converter. In addition, the dual pulse modulation scheme suitable for the LLC-LC dc-dc converter has been investigated in [25], whereby it has been verified that power conversion efficiency can improve by adopting pulse-density-modulation (PDM) for the light load conditions.…”

mentioning

confidence: 81%

A Sensitivity-Improved PFM <italic>LLC</italic> Resonant Full-Bridge DC–DC Converter With <italic> LC</italic> Antiresonant Circuitry

Mishima

Mizutani

Nakaoka

2017

IEEE Trans. Power Electron.

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An LLC resonant circuit-based full-bridge dc-dc converter with an LC anti-resonant tank for improving the performance of pulse-frequency-modulation (PFM) is proposed in this paper. The proposed resonant dc-dc converter, named as LLC-LC converter can extend a voltage regulation area below the unity gain with a smaller frequency variation of PFM by the effect of the anti-resonant tank. This advantageous property contributes for protecting over-current in the case of the short-circuit load condition as well as the start-up interval in the designed band of switching frequency. The circuit topology and operating principle of the proposed converter is described, after which the design procedure of the operating frequency and circuit parameters is presented. The performances on the soft switching and the steady-state PFM characteristics of the LLC-LC converter are evaluated under the open-loop control in experiment of a 2.5 kW prototype, and its actual efficiency is compared with a LLC converter prototype. For revealing the effectiveness of the LLC-LC resonant circuitry, voltages and currents of the series and anti-resonant tanks are analyzed respectively with state-plane trajectories based on calculation and experiment, whereby the power and energy of each resonant tank are demonstrated. Finally, the feasibility of the proposed converter is evaluated from the practical point of view. Keywords-LLC resonant converter, anti-resonant tank, LLC-LC resonant converter, pulse frequency modulation (PFM), over-current protection (OCP), buck and boost voltage regulations, zero voltage soft-switching (ZVS), zero current soft-switching (ZCS). Nomenclature f s : Switching frequency ω s : Angular switching frequency (ω s = 2πf s) M : Input / output voltage conversion ratio (M = V o /V in) a : High-frequency transformer windings turns ratio (a = N 1 /N 2) f rs : Series resonant frequency (f rs = 1/(2π √ L s C s)) f rm : LLC resonant frequency (f rm = 1/(2π (L s + L m)C s)) F rs : Switching frequency normalized to series resonant frequency (F rs = f s /f rs)

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“…A review of multielement resonant converters is in [90], and a comparison of different topologies of multielement RPCs is presented in [91]. The classification and selection methodology for multielement resonant converters is outlined in [92], while the design, simulation, and experimental evaluation of multielement RPCs are presented in [93] and [94]. The more elements there are, the more topologies may be realized.…”

Section: Multielement Rpcsmentioning

confidence: 99%