System Optimization of a High Power Density Non-Isolated Intermediate Bus Converter for 48 V Server Applications

Reusch, David; Biswas, Suvankar; Zhang, Yuanzhe

doi:10.1109/tia.2018.2875387

Cited by 23 publications

(8 citation statements)

References 17 publications

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“…In electric vehicle (EV) applications, a boost converter is usually used to step up the low battery voltage to high DC-Link voltage [5], [6], [7]. On the other hand, low-power DC-DC converters are used in applications such as DC motor drive and intermediate bus converters (IBC) [8], [9], [10], [11], [12]. With the rapid development of DC-DC power conversion technology, conventional inductorbased switching mode power supplies (SMPS) can no longer meet the high efficiency and high power density requirement of the market.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of High-Efficiency Modular Multilevel Resonant DC-DC Converter

Wei

Lyu

et al. 2022

IEEE Open J. Power Electron.

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This paper demonstrates a high-efficiency modular multilevel resonant DC-DC converter (MMRC) with zero-voltage switching (ZVS) capability. In order to minimize the conduction loss in the converter, optimizing the root-mean-square (RMS) current flowing through switching devices is considered an effective approach. The analysis of circuit configuration and operating principle show that the RMS value of the current flowing through switching devices is closely related to the factors such as the resonant tank parameters, switching frequency, converter output voltage and current, etc. A quantitative analysis that considers all these factors has been performed to evaluate the RMS current of all the components in the circuit. When the circuit parameters are carefully designed, the switch current waveform can be close to the square waveform, which has a low RMS value and results in low conduction loss. And a design example based on the theoretical analysis is presented to show the design procedures of the presented converter. A 600 W 48 V-to-12 V prototype is built with the parameters obtained from the design example section. Simulation and experiments have been performed to verify the high-efficiency feature of the designed converter. The measured converter peak efficiency reaches 99.55% when it operates at 200 kHz. And its power density can be as high as 795 W/in 3 . Modular, multilevel, resonant, resonant DC-DC converter, switched-capacitor, zero-voltage switching (ZVS). INDEX TERMS

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Section: Introductionmentioning

confidence: 99%

Analysis and Design of High-Efficiency Modular Multilevel Resonant DC-DC Converter

Wei

Lyu

et al. 2022

IEEE Open J. Power Electron.

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“…The converter presented in this paper was designed on a GaN-based concept. The GaN-based design with a properly selected converter's topology allows for achieving both switching and conduction loss limitation [8,9], [23,24], [27]. Moreover, this approach allows for a decrease in the converter's volume.…”

Section: Introductionmentioning

confidence: 99%

“…Analysis of the converter efficiency is presented in section 7. The next stage (8) provides the results of the experimental research performed on the prototype unit of the proposed device. Some comments related to the obtained results are also included here.…”

Section: Introductionmentioning

confidence: 99%

48-V Input DC-DC High Step-Down Converter in GaN-Based Design

2022

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This paper presents a novel high step-down DC-DC converter based on a switched-capacitor resonant topology. It is presented in a 48/8 V version, which was verified by simulations and experiments. The most notable features specific to this converter are an almost non-iductive design and relatively low voltage stress across switching devices. The proposed topology allows for zero-current-switching (ZCS) and zero-voltage-switching (ZVS). Experimental tests confirm that ZVS operation brings a significant increase in the efficiency of the proposed device. Taking into account all the advantages of the suggested converter, it can be concluded that this device is suitable for any application where a high step-down voltage conversion is required. In a prospective application, the proposed converter can be utilized as a part of the power supply unit for data centers.INDEX TERMS Buck converters, DC-DC converters, high voltage step-down gain converter, switchedcapacitor circuit.

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“…These so-called wide band-gap semiconductor power devices are characterized by their high-speed switching and high-frequency operation capability [1]- [3]. High-speed switching reduces the power loss in switching power supplies, while high-frequency operations miniaturize such power supplies [4]- [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Near-Field Strength Prediction of a Power Module by Measurement-Independent Modeling of Its Structure

et al. 2020

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This paper presents a simulation scheme based on the S-parameters for simultaneously predicting the circuit operation of a power module (PM) and its consequent magnetic near-field (NF) strength. The PM comprises silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs). The circuit simulation is carried out using the S-parameterized PM aided by the SiC MOSFET die model, which allows for a precise replication of the switching waveforms. Note that the Sparameterized process needs no measurement data of the PM. The only experimental data are the characteristics of the specific SiC MOSFET dies used in the PM to adjust the die model. A buck converter is configured with the PM, and the magnetic NF radiated from the PM is measured in order to verify the validity of the proposed scheme. The magnetic field detection probe does not measure the magnetic field itself; instead, it measures the electromotive force (EMF) induced by the magnetic field. Accordingly, the simulated magnetic NF should be converted to the corresponding EMF, which enables a comparison of the measured and simulated results. This simulation scheme works successfully to predict the magnetic NF, but modeling the whole converter system is indispensable.

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System Optimization of a High Power Density Non-Isolated Intermediate Bus Converter for 48 V Server Applications

Cited by 23 publications

References 17 publications

Analysis and Design of High-Efficiency Modular Multilevel Resonant DC-DC Converter

Analysis and Design of High-Efficiency Modular Multilevel Resonant DC-DC Converter

48-V Input DC-DC High Step-Down Converter in GaN-Based Design

Magnetic Near-Field Strength Prediction of a Power Module by Measurement-Independent Modeling of Its Structure

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