High Efficiency Variable-Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model

Zhao, Lei; Li, Haoyu; Liu, Yuan; Li, Zhenwei

doi:10.3390/en8042647

Cited by 23 publications

(23 citation statements)

References 28 publications

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“…Moreover, the complexity of the problem and the difficulty of estimating the real values The design of the DC-DC converter has many degrees of freedom which complicates the selection of the components values resulting in the best solution. Finding the design solution with the highest power density and/or efficiency and/or cost requires an optimization procedure based on comprehensive analytical models and equations considering the losses in the converter components [9,15]. With this procedure, the optimal design parameters could be determined.…”

Section: Losses Modelmentioning

confidence: 99%

“…The power losses analysis is discussed in this section to help understand where the losses are originated. There are three types of power losses for a switching power converter, as follows [15]: conduction losses, switching losses (including gate-driving power losses), and magnetic core losses.…”

Section: Losses Modelmentioning

confidence: 99%

“…The PSFB converter's operation can be classified into discontinuous conduction mode (DCM), if the output filter inductor current ripple is higher than the average output or continuous conduction mode (CCM) otherwise. The circuit analysis in CCM is quite different from that in DCM because of the different operation modes [15]. In this work we will consider only the CCM working mode (the proposed losses model does not include DCM operation).…”

Section: Losses Modelmentioning

confidence: 99%

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A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

et al. 2019

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The phase shift full bridge (PSFB) is a widely known isolated DC-DC converter topology commonly used in medium to high power applications, and one of the best candidates for the front-end DC-DC converter in server power supplies. Since the server power supplies consume an enormous amount of power, the most critical issue is to achieve high efficiency. Several organizations promoting electrical energy efficiency, like the 80 PLUS, keep introducing higher efficiency certifications with growing requirements extending also to light loads. The design of a high efficiency PSFB converter is a complex problem with many degrees of freedom which requires of a sufficiently accurate modeling of the losses and of efficient design criteria. In this work a losses model of the converter is proposed as well as design guidelines for the efficiency optimization of PSFB converter. The model and the criteria are tested with the redesign of an existing reference PSFB converter of 1400 W for server applications, with wide input voltage range, nominal 400 V input and 12 V output; achieving 95.85% of efficiency at 50% of the load. A new optimized prototype of PSFB was built with the same specifications, achieving a peak efficiency of 96.68% at 50% of the load.

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Section: Losses Modelmentioning

confidence: 99%

Section: Losses Modelmentioning

confidence: 99%

Section: Losses Modelmentioning

confidence: 99%

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A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

et al. 2019

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“…Слита Научно-технический вестник информационных технологий, механики и оптики, 2018, том 18, № 4 701 В работе рассматривается мостовой преобразователь напряжения постоянного тока, используемый в качестве вторичного источника питания [1,2] при низком входном напряжении и требуемом высоком выходном напряжении и мощности, включающий в себя мостовой инвертор, повышающий трансформатор c добавочной индуктивностью, введенной в первичную обмотку для обеспечения мягкой коммутации силовых ключей и исключения насыщения сердечника [3], и диодный выпрямитель, нагруженный на емкостной фильтр и активную нагрузку. В литературе представлены способы повышения КПД путем изменения частоты коммутации для случая, когда нагрузка изменяется в диапазоне от 25% до 100% [4,5]. Увеличение частоты коммутации позволяет уменьшить линейные размеры сердечника трансформатора при сохранении выходной мощности, что ведет к уменьшению магнитных потерь, но потери, обусловленные переключением силовых ключей, значительно увеличиваются [6].…”

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Control law design for full-bridge converter with soft commutation based on frequency variation of transistors switching

Александровна¹,

Петрович²,

Анатольевич³

et al. 2018

Naučno-teh. vestn. inf. tehnol. meh. opt.

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Предлагается метод широтно-импульсного регулирования мостовым преобразователем напряжения постоянного тока, напряжение питания которого меняется в широком диапазоне, основанный на изменении частоты коммутации транзисторов мостового инвертора, реализованный в виде пропорционально-интегрального регулятора с настраиваемыми параметрами. Разработанный метод позволяет улучшить динамические характеристики системы и ограничить максимальный ток, коммутируемый транзисторами. Спроектированный закон управления позволяет получить желаемое стабилизированное значение напряжения на нагрузке. Ключевые слова мостовой инвертор, мягкая коммутация, широтно-импульсное регулирование, пропорционально-интегральный регулятор, индуктивность рассеивания Благодарности Работа выполнена при государственной поддержке ведущих университетов Российской Федерации (субсидия 08-08). Работа была поддержана Министерством образования и науки Российской Федерации (проект 14.Z50.31.0031).

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“…By using parasitic circuit elements such as junction capacitances of switches and leakage inductance of transformer, phase-shifted full-bridge (PSFB) converter provides zero-voltage-switching (ZVS) for switches without requiring any additional active devices [1,2]. These characteristics can reduce switching loss and enable high switching frequency operation.…”

Section: Introductionmentioning

confidence: 99%

A Novel Choice Procedure of Magnetic Component Values for Phase Shifted Full Bridge Converters with a Variable Dead-Time Control Method

Zhao

et al. 2015

Energies

Self Cite

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Magnetic components are important parts of the phase shifted full bridge (PSFB) converter. During the dead-time of switches located in the same leg, the converter can achieve zero-voltage-switching (ZVS) by using the energies stored in magnetic components to discharge or charge the output capacitances of switches. Dead-time is usually calculated under a given set of pre-defined load condition which results in that the available energies are insufficient and ZVS capability is lost at light loads. In this paper, the PSFB converter is controlled by variable dead-time method and thus full advantage can be taken of the energies stored in magnetic components. Considering that dead-time has a great effect on ZVS, the relationship between available energies and magnetic component values is formulated by analyzing the equivalent circuits during dead-time intervals. Magnetic component values are chosen based on such relationship. The proposed choice procedure can make the available energies greater than the required energies for ZVS operation over a wide range of load conditions. Moreover, the burst mode control is adopted in order to reduce the standby power loss. Experimental results coincide with the theoretical analysis. The proposed method is a simple and practical solution to extend the ZVS range.

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High Efficiency Variable-Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model

Cited by 23 publications

References 28 publications

A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

Control law design for full-bridge converter with soft commutation based on frequency variation of transistors switching

A Novel Choice Procedure of Magnetic Component Values for Phase Shifted Full Bridge Converters with a Variable Dead-Time Control Method

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