Using coupled inductors to enhance transient performance of multi-phase buck converters

Li, Jieli; Stratakos, A.; Schultz, A. J.; Sullivan, Charles R.

doi:10.1109/apec.2004.1295989

Cited by 76 publications

(5 citation statements)

References 3 publications

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“…If we set the maximum allowed flux density is 75% of the saturation flux density, and push the numbers into (6) At 20kHz, 0.5T AC flux will generate 100kW/m 3 according to the datasheet, which is larger than B DM value calculated in (8). So we can fully use the saturation margin.…”

Section: A Design Examplementioning

confidence: 98%

“…(Fig.1) When converters are paralleled, interleaving operation could be applied to reduce input and output passive component size. Many papers have analyzed the benefits of interleaving for two-level converter, including low power applications [2][3][4][5][6][7][8] and high power applications [9][10]. For two-level paralleled converters case, interleaving operation have no impact on inductor current ripple while overall input or output current ripple will be reduced.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and design of coupled inductor for interleaved multiphase three-level DC-DC converters

Lee

Jiao

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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the coupled inductor can reduce the large inductor current ripple in the interleaved multiphase three-level converter, while keeping the benefits of interleaving. The design of the coupled inductor is different from conventional two-level converters. This paper analyzes the flux in the coupled inductors of interleaved multiphase three-level DC-DC converters. Based on the flux analysis, a design procedure is introduced. A new structure of the coupled inductor is also proposed which can significantly reduce the volume and is easy to fabricate.

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Section: A Design Examplementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Analysis and design of coupled inductor for interleaved multiphase three-level DC-DC converters

Lee

Jiao

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Fig. 10 shows several existing coupled inductor structures [6], [7]. In order to have the maximum inductor current ripple reduction, center gap structure shown in Fig.…”

Section: Proposed Coupled Inductor Structure and Its Operationmentioning

confidence: 99%

“…This cycle repeats again in mode 3 and 4. As a result, the output current ripple occurs twice during a given period s T [6][7], [11]. The equation for the output current ripple is…”

mentioning

confidence: 99%

Analysis and Design of Coupled Inductors for Two-Phase Interleaved DC-DC Converters

Lee¹,

Cha²,

Shin³

et al. 2013

Journal of Power Electronics

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Multiphase dc-dc converters are widely used in modern power electronics applications due to their advantages over single-phase converters. Such advantages include reduced current stress in both the switching devices and passive elements, reduced output current ripple, and so on. Although the output current ripple of a converter can be significantly reduced by virtue of the interleaving effect, the inductor current ripple cannot be reduced even with the interleaving PWM method. One way to solve this problem is to use a coupled inductor. However, care must be taken in designing the coupled inductor to maximize its performances. In this paper, a detailed analysis of a coupled inductor is conducted and the effect of a coupled inductor on current ripple reduction is investigated extensively. From this analysis, a UU core based coupled inductor structure is proposed to maximize the performance of the coupled inductor.

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“…Besides common output inductors, a special class of coupled inductors for multiphase architectures [173] was initially presented by year 2000, and rapidly introduced in the market [174]. Several studies have shown that, by means of magnetically coupling the inductor of each of the phases, output ripple cancellation and transient response can further be enhanced.…”

Section: Output Filtermentioning

confidence: 99%

Prospects of voltage regulators for next generation computer microprocessors

López Julià

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Synchronous buck converter based multiphase architectures are evaluated to determine whether or not the most widespread voltage regulator topology can meet the power delivery requirements of next generation computer microprocessors. According to the prognostications, the load current will rise to 200A along with the decrease of the supply voltage to 0.5V and staggering tight dynamic and static load line tolerances. In view of these demands, researchers face serious challenges to bring forth compliant solutions that can further offer acceptable conversion efficiencies and minimum mainboard area occupancy. Among the most prominent investigation fronts are those surveying fundamental technology improvements aiming at making power semiconductor devices more effective at high switching frequency. The latter is of critical importance as the increase of the switching frequency is fundamentally recognized as the way forward to enhance power density conversion. Provided that switching losses must be kept low to enable the miniaturization of the filter components, one primary goal is to cope with semiconductor and system integration technologies enabling fast dynamic operation of ultra-low ON resistance power switches. This justifies the main focus of this thesis work, centered around a comprehensive analysis of the MOSFET switching behavior in the synchronous buck converter. The MOSFETs dynamic operation, far from being well describable with the traditional clamped inductive hard-switching mode, is strongly influenced by a number of frequently ignored linear and nonlinear parasitic elements that must be taken into account in order to fully predict real switching waveforms, understand their dynamics, and most importantly, identify and quantify the related mechanisms leading to heat generation. This will be revealed from in-depth investigations of the switched converter under fast switching speeds and heavy load. Recognizing the key relevance of appropriate modeling tools that support this task, the second focal point of the thesis aims at developing a number of suitable models for the switching analysis of power MOSFETs. Combined with a series of design guidelines and optimization procedures, these models form the basis of a proposed methodological approach, where numerical computations replace the usually enormous experimental effort to elucidate the most effective pathways towards reducing power losses. This gives rise to the concept referred to as virtual design loop, which is successfully applied to the development of a new power MOSFET technology offering outstanding dynamic and static performance characteristics. From a system perspective, the limits of the power density conversion will be explored for this and other emerging technologies that promise to open up a new paradigm in power integration capabilities.

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Using coupled inductors to enhance transient performance of multi-phase buck converters

Cited by 76 publications

References 3 publications

Analysis and design of coupled inductor for interleaved multiphase three-level DC-DC converters

Analysis and design of coupled inductor for interleaved multiphase three-level DC-DC converters

Analysis and Design of Coupled Inductors for Two-Phase Interleaved DC-DC Converters

Prospects of voltage regulators for next generation computer microprocessors

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