LLC Resonant Converter with 99% Efficiency for Data Center Server

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

doi:10.1109/apec42165.2021.9487423

Cited by 36 publications

(4 citation statements)

References 16 publications

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“…This work is compared in Fig. 25 to the state-of-art achievements in the regulated 400to-48-V converters [3], [7], [18]- [20], [25], [26]. The proposed 3-kW LLC converter shows superiority in efficiency and power density.…”

Section: Resultsmentioning

confidence: 99%

Efficient Integrated Transformer–Inductor With High PCB Utilization and Optimized Core

Nabih,

Jin,

2024

IEEE Trans. Ind. Electron.

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This paper addresses the challenges associated with the high winding and core loss in the Integrated Transformer-Inductor (ITL). To overcome these challenges, we propose an improved winding design of the ITL by utilizing idle shielding layers for inductor integration within the matrix transformer. This method offers full printed circuit board (PCB) utilization, where all layers are consumed as winding, resulting in a significant reduction in the winding loss of the ITL.Moreover, we propose an improved core structure of the ITL that offers better flux distribution of the leakage flux within the magnetic core. This method reduces the core loss by more than 50\% compared to the conventional core structure.We demonstrate the effectiveness of our proposed concepts by presenting the design of the ITL used in a high-efficiency, highpower-density 3-kW 400-V-to-48-V LLC module. The proposed converter achieves a peak efficiency of 98.7\% and a power density of 1050 W/in3.

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Section: Resultsmentioning

confidence: 99%

Efficient Integrated Transformer–Inductor With High PCB Utilization and Optimized Core

Nabih,

Jin,

2024

IEEE Trans. Ind. Electron.

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“…The applicability of the proposed CRT topology is the same as that of traditional multiphase LLC converters. For example, the CRT topology can be applied to the auxiliary power supply of electric vehicles [22,23], the CPU load power supply of the data centre [24,25], and the charging and discharging of energy storage batteries in the DC micro-grid system [26].…”

Section: Proposed Crt Current Sharing Methodsmentioning

confidence: 99%

“…where the coefficients A 3 , B 3 and C 3 can be calculated in Equation (A3). Then, the current sharing error of the CCM method can be obtained by combining (17), (24) and (34).…”

Section: Current Sharing Error Model Of the Crt Methodsmentioning

confidence: 99%

Depth comparison of common inductor and common capacitor passive current sharing methods for multiphase LLC converter

Sun,

Wu,

Wang

et al. 2023

IET Power Electronics

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Common inductor (CIM) and common capacitor (CCM) passive current‐sharing methods have the advantages of simple implementation and low cost. However, there is still a lack of detailed comparative research on the two methods, which makes researchers confused when choosing the two methods. To provide clear scheme guidance, this paper provides a detailed comparison of the performance of the two methods. Firstly, this paper reveals the difference between the current waveforms of the two methods, that is, the current waveform of the CIM method is distorted, while the CCM method is non‐distorted. Then, the mechanism of the above phenomenon is analysed in depth. Secondly, for comparing the current sharing performance of the two methods, the first harmonic approximation (FHA) equivalent circuit model considering parasitic parameters is established to obtain the system's current sharing error model, and the parameter sensitivity analysis is provided. Finally, the relationship between the current waveform, current sharing error, and load ripple of the two methods is discussed. Then, based on the two methods, a more attractive common resonate tanks (CRT) current‐sharing method is proposed. The correctness of the view in this paper has been verified by extensive simulations and experiment results.

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“…The increasing availability of semiconductor switches, such as silicon carbide (SiC) and gallium nitride (GaN) MOSFET, allows for significantly lower switching losses, allowing for higher switching frequencies. LLC resonant converter, one of the DC-DC converters, has been applied to electric vehicle chargers, new energy charging piles, server power supplies, communication power supplies, LED drivers and other fields [2][3][4]. At present, LLC resonant converter is developing towards smaller volume, lighter weight and higher efficiency, and continues to improve its overall performance to meet the needs of industrial production.…”

Section: Introductionmentioning

confidence: 99%

Double Closed-Loop Control Strategy of LLC Resonant Converter Based on LADRC

Hao,

Guo

2023

Advances in Transdisciplinary Engineering

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LLC resonant converter, which is widely used in the charging of new energy vehicles, can achieve zero-voltage switching (ZVS) of the primary side MOSFET and zero-current switching (ZCS) of the secondary side rectifying diode. They also have the advantages of high efficiency and high-power density. The output voltage is still affected by input voltage fluctuation, reference voltage change, load mutation and other factors. The charging mode of automobile batteries with different materials is also different. In order to stabilize the output voltage and realize automatic switching of constant voltage and current, this paper proposes a double closed-loop linear active disturbance rejection control (LADRC) scheme. Firstly, the transfer functions of the system are obtained by extended description function (EDF) method and simulation method respectively. The transfer functions of the two methods are compared and analysed. Finally, the LADRC controller and PI controller are simulated and compared, and the dynamic performance of the control system is evaluated by ITAE index. The experimental results show that the output voltage of LADRC control is more stable.

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LLC Resonant Converter with 99% Efficiency for Data Center Server

Cited by 36 publications

References 16 publications

Efficient Integrated Transformer–Inductor With High PCB Utilization and Optimized Core

Efficient Integrated Transformer–Inductor With High PCB Utilization and Optimized Core

Depth comparison of common inductor and common capacitor passive current sharing methods for multiphase LLC converter

Double Closed-Loop Control Strategy of LLC Resonant Converter Based on LADRC

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