Low-complexity analytical approximations of switching frequency harmonics of 3-phase N-level voltage-source PWM converters

Burkart, Ralph M.; Kolar, Johann W.

doi:10.1109/ipec.2014.6869993

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…This, in combination with the higher effective switching frequency, leads to a significantly reduced ripple of the mains current i g for a given inductance of the line inductor L g and also to an improved EMI behavior as described in the following. Based on [6] the amplitudeV FB,i of a harmonic with order q of the mains frequency f g = 1/T g can be calculated for a single full-bridge stage for a modulation index m(t) = v FB,tot (t)/V DC asV…”

Section: A Switching Frequency and Harmonic Spectrummentioning

confidence: 99%

Hyper-efficient (98%) and super-compact (3.3kW/dm3) isolated AC/DC telecom power supply module based on multi-cell converter approach

Kasper

Bortis

Kolar

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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In this paper, a multi-cell converter approach for a telecom rectifier module breaking through the efficiency and power density barriers of traditional single-cell converter systems is shown. The potential of the multi-cell approach for high efficiency is derived from fundamental scaling laws of the system performances, such as the losses generated by the semiconductors and the harmonic spectrum, in dependence of the number of converter cells. Furthermore, a comprehensive optimization of the entire system with respect to efficiency and volume has been performed and the applied component loss models are described in detail. The achievable performance of the system is compared to a leading edge state-of-the-art single-cell converter system which currently sets the benchmark in terms of efficiency and power-density. In addition, the degrees of freedom of multi-cell converter systems in terms of converter operation are outlined and optimum control schemes are derived. I. INTRODUCTIONToday's single-phase telecom power supply modules usually comprise a PFC rectifier stage and an isolated DC-DC converter output stage, typically generating a nominal output voltage of 48 V. The rectifier stage in conventional power electronic systems is a boost-type PFC rectifier which consists of a full-bridge diode rectifier in connection with a boost converter. Since the forward voltage drops of the diodes in the rectifier account for high conduction losses, alternative topologies have gained significant interest over the past years [1], [2]. E.g. in [3] a triple-parallel-interleaved TCM PFC rectifier system is described in combination with a double-parallel-interleaved phase-shift full-bridge isolated DC-DC converter for telecom applications (rated power P out = 3.3 kW, output voltage V out = 48 V) featuring a power density of ρ = 3.3 kW/dm 3 and an efficiency of η = 97 % at half of the rated power. As shown in [4], this concept currently presents the leading edge technology for telecom power supplies and therefore serves as a benchmark system in this paper. A new approach towards a hyper-efficient and super-compact telecom rectifier design beyond the barriers of traditional converter concepts is presented in this paper. The approach is based on a multi-cell converter concept that leverages the advantages obtained by employing multiple series-parallel connected converter cells instead of a single converter, such as lower conduction and switching losses and reduction of harmonics by interleaving [5]. The performance targets that can be achieved with this approach are an output power of P out = 3.3 kW with a conversion efficiency of 98% at part

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Section: A Switching Frequency and Harmonic Spectrummentioning

confidence: 99%

Hyper-efficient (98%) and super-compact (3.3kW/dm3) isolated AC/DC telecom power supply module based on multi-cell converter approach

Kasper

Bortis

Kolar

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…1 shows the analyzed boost inductors in a typical grid-side application (e. g. solar inverters,input stage of unin terruptible power suplies). A 3-phase 3-level voltage-source PWM converter employing a sinusoidal PWM control scheme with third harmonic injection was selected [22]. The EMI filter, which is normally required to meet the applicable EMC directives, is assumed to feature ideal characteristics, i.e.…”

Section: -80 Khzmentioning

confidence: 99%

“…Fig. 2) 4) lACS copper / insulation material the given system can be computed using the analytical methods presented in [22] or by means of simulations.…”

Section: Insulation Type Ins Increase (Mm)mentioning

confidence: 99%

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Optimal inductor design for 3-phase voltage-source PWM converters considering different magnetic materials and a wide switching frequency range

Burkart

Uemura

Kolar

2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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In this paper, an optimization regarding volume, efficiency and costs of AC boost inductors in 3-phase PWM converters based on detailed multi-domain models is presented. The optimization is performed for a wide switching frequency range of 5-80kHz and a wide current ripple range of 5-100 %, considering ferrite, amorphous and powder core materials in combination with round, Iitz, foil and flat wire windings. The shown analysis and optimization identifies the best core mate riaVwinding type combinations for both thermally and efficiency constrained inductor designs. Furthermore, the investigations reveal that simplified scaling assumptions, e.g. a proportional relationship between the inductor volume and the inverse of the frequency or the stored energy, are only accurate in special cases.

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Hardware verification of a hyper-efficient (98%) and super-compact (2.2kW/dm3) isolated AC/DC telecom power supply module based on multi-cell converter approach

Kasper

Chen

Bortis

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Low-complexity analytical approximations of switching frequency harmonics of 3-phase N-level voltage-source PWM converters

Cited by 5 publications

References 16 publications

Hyper-efficient (98%) and super-compact (3.3kW/dm<sup>3</sup>) isolated AC/DC telecom power supply module based on multi-cell converter approach

Hyper-efficient (98%) and super-compact (3.3kW/dm<sup>3</sup>) isolated AC/DC telecom power supply module based on multi-cell converter approach

Optimal inductor design for 3-phase voltage-source PWM converters considering different magnetic materials and a wide switching frequency range

Hardware verification of a hyper-efficient (98%) and super-compact (2.2kW/dm<sup>3</sup>) isolated AC/DC telecom power supply module based on multi-cell converter approach

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