High Frequency Resonant Converters: An Overview on the Magnetic Design and Control Methods

Lee, Fred C.; Li, Qiang; Nabih, Ahmed

doi:10.1109/jestpe.2020.3011166

Cited by 79 publications

(15 citation statements)

References 20 publications

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“…The above equations ( 14) can be written as matrix forms (15) to found the equilibrium operating points x. 1 .…”

Section: E Determination Of the Equilibrium Operating Pointsmentioning

confidence: 99%

“…In the power electronics domain, there are particular types of inverters known as resonant inverters. These types are used in many power applications, where the generated output voltage of resonant inverter topologies has a highfrequency value [1]. The resonant inverter has received much attention in power electronics research and introduced in a wide range of industry applications, including: power conversion systems [2], induction heating [3], telecommunication and wireless power transfer [4], and ozone generators [5].…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Small Signal Modeling of Five-Level Series Resonant Inverter

et al. 2021

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This paper explains the implementation of a small-signal model for a new five-level series resonant inverter structure. The proposed circuit combines the advantages of multilevel inverters and the characteristics of the physical phenomena, resonance. The small-signal model offers the possibility to design a linearized linear time-invariant (LTI) model around an equilibrium point based on first order Taylor series. After that, the performance of the proposed five-level series resonant inverter and its smallsignal model are evaluated in MATLAB/Simulink environment. Compared with a MATLAB model generated using the system identification toolbox, the developed small-signal model exhibited a good accuracy in frequency and time domains. In addition, a hardware test bench is developed to validate the proposed model. Both simulation and experimental results shows that the proposed multilevel resonant inverter is very interesting for high-voltage high-frequency applications. As a perspective, from the results obtained, we suggest the use of small-signal AC analysis for multilevel series resonant inverter modeling. The paper contains rich information of the recently used tools for dynamic systems modeling and analysis of nonlinear processes that can be applied for the modeling and analysis of other power electronics inverters.INDEX TERMS AC analysis of dynamic nonlinear system, five-level series resonant inverter, inverter mathematical model, multilevel inverter simulation, model of inverter, small-signal modeling.

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“…The above equations ( 14) can be written as matrix forms (15) to found the equilibrium operating points x. 1 .…”

Section: E Determination Of the Equilibrium Operating Pointsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Small Signal Modeling of Five-Level Series Resonant Inverter

et al. 2021

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“…Taking the LLC circuit shown in Fig. 1 as an example, there are following problems under high frequency and high current [5]: 1) current sharing issues in parallel windings; 2) current sharing issues in parallel synchronous rectifiers (SRs); 3) large terminal loss; 4) large leakage inductance, etc. Therefore, it is not a high-efficiency way to directly parallelize multiple windings in high-frequency and high-current applications.…”

Section: Introductionmentioning

confidence: 99%

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

Wang

Gao

Guo

et al. 2023

IEEE Trans. Power Electron.

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In MHz and high current applications, planar transformers face problems such as significant winding loss and limited winding current-carrying capacity, which seriously restrict converter's efficiency and power density improvement. This paper proposes a fractional-turn planar transformer structure and embeds key power devices into the transformer. The proposed method can significantly shorten the winding length, thus reducing winding losses. At the same time, the high integration of the transformer and key power devices can effectively reduce the overall volume of the converter and eliminate terminal losses. The analysis and optimization of the proposed integrated fractional-turn transformer are presented in detail. Finally, a 380V-12V 1kW unregulated LLC is built with the proposed integrated transformer. The full-load efficiency is 97.7%, and the power density is 99W/cm 3 , both of which are the highest among the state-of-the-art prototypes with similar specifications. 1

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“…High power designs have significant transformer conduction loss. A matrix of transformers can help to reduce the conduction loss in the transformer winding and secondary side devices as well [4] [5]. The two introduced designs are based on a 6-layer PCB that integrates all magnetic components and active switches of the converter and introduce low profile converter design.…”

Section: Introductionmentioning

confidence: 99%

3kW Power Supply Design with Easy Manufacturability for 48 V Bus Power Architecture

Nabih¹,

Li²,

Lee³

2022

Preprint

Self Cite

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The increase of power requirements per server rack, especially in the 48V bus architecture is demanding the increase of rated power and power density per power supply to fit as many power supplies in the server rack power shelf as possible. Due to the trade-off between fabrication cost and efficiency (running cost) of the power supply, the design of efficient but yet less labor-intensive power supply is important. This paper discusses methods to design DC-DC unit of the 3kW power supply for the 48V architecture with easier manufacturability and lower cost. Prototype for 400V/48V 3kW 1MHz is demonstrated.

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High Frequency Resonant Converters: An Overview on the Magnetic Design and Control Methods

Cited by 79 publications

References 20 publications

Analysis and Small Signal Modeling of Five-Level Series Resonant Inverter

Analysis and Small Signal Modeling of Five-Level Series Resonant Inverter

Integrated Fractional-Turn Planar Transformer for MHz and High-Current Applications

3kW Power Supply Design with Easy Manufacturability for 48 V Bus Power Architecture

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