Accurate ZVS Analysis for Magnetic Design and Efficiency Improvement of Full-Bridge LLC Resonant Converter

Kundu, Utsab; Yenduri, Kalyan; Sensarma, Parthasarathi

doi:10.1109/tpel.2016.2604118

Cited by 101 publications

(67 citation statements)

References 12 publications

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“…When switching at the resonance frequency f n = 1, the maximum magnetizing inductance to successfully charge/discharge the MOSFETs C oss can be calculated in (21) as verified in [12].…”

Section: A DC Gain Analysismentioning

confidence: 95%

“…Combining equations (4) to (9) the transfer function of the CLLC resonant tank is obtained and by finding the modulus the dc gain can be calculated as shown in (12).…”

Section: A DC Gain Analysismentioning

confidence: 99%

“…V cr1,rms = I peak Z req 2 √ 2f n (25) I peak refers to the peak current of the resonant current flowing through the HVs, and can be approximated with (26 according to [12]. Fig.7a and 7b show the capacitor required and the rms voltage across the capacitor for different Z req in per unit, being the base value the maximum allowed Z req .…”

Section: Resonant Components Selectionmentioning

confidence: 99%

See 2 more Smart Citations

Unregulated series resonant converter for interlinking DC nanogrids

Tomas-Manez

Zhang

Ouyang

2017

2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS)

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DC nanogrids have become a subject of interest in recent years due to the increase of renewable energy sources with energy storage systems. Hybrid AC/DC systems with different DC buses are an interesting solution to efficiently supply different AC and DC loads. In this paper, a high efficiency bidirectional converter to interlink a 400 V DC bus with a 48 V DC bus is presented. The proposed converter is based on a LLC resonant converter operating as a DC transformer at a fixed frequency and duty cycle without any complex control strategy. A clear and simplified design procedure for high efficiency operation and optimal self-load regulation is presented. To verify the converter operation, a 1 kW prototype has been implemented, featuring on maximum efficiency of 96.7 % and a self-regulated output voltage with 3 % of maximum offset from the nominal voltage.

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“…When switching at the resonance frequency f n = 1, the maximum magnetizing inductance to successfully charge/discharge the MOSFETs C oss can be calculated in (21) as verified in [12].…”

Section: A DC Gain Analysismentioning

confidence: 95%

“…Combining equations (4) to (9) the transfer function of the CLLC resonant tank is obtained and by finding the modulus the dc gain can be calculated as shown in (12).…”

Section: A DC Gain Analysismentioning

confidence: 99%

Section: Resonant Components Selectionmentioning

confidence: 99%

See 1 more Smart Citation

Unregulated series resonant converter for interlinking DC nanogrids

Tomas-Manez

Zhang

Ouyang

2017

2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS)

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show abstract

“…In terms of efficiency optimization, some researches have tried to consider parameter design [11,12] and device improvement [13][14][15]. In [11], a general-purpose mode analysis is proposed to accurately predict the resonant characteristics of an LLC.…”

Section: Introductionmentioning

confidence: 99%

A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

Huo

Liu

et al. 2019

Energies

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In this paper, a structure-reconfigurable resonant DC-DC (direct current -direct current) converter is presented. By controlling the state of the auxiliary switch, the converter could change the resonant structure to acquire a high efficiency and wide voltage gain range simultaneously. The characteristics of the LLC (inductor-inductor-capacitor) resonant converter are firstly analyzed. Based on this, through introducing additional resonant elements and adopting the topology morphing method, the proposed converter can be formed. Moreover, a novel parameter selection method is discussed to satisfy both working states. Then, a detailed loss analysis calculation is conducted to determine the optimal switching point. In addition, an extra resonant zero point is generated by the topology itself, and the inherent over-current protection is guaranteed. Finally, a 500 W prototype is built to demonstrate the theoretical rationality. The output voltage is constant at 400 V even if the input voltage varies from 160 to 400 V. A peak efficiency of 97.2% is achieved.Energies 2019, 12, 2905 2 of 25 efficiency is another requirement to be met. To sum up, DC-DC converters with a high efficiency and wide voltage gain range have considerable research significance.Energies 2019, 12, x FOR PEER REVIEW 2 of 25 high conversion efficiency is another requirement to be met. To sum up, DC-DC converters with a high efficiency and wide voltage gain range have considerable research significance.

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“…DC/DC converters have been widely used to provide constant voltage or current [1][2][3][4]. When the DC/DC converter is controlled as a voltage source, the voltage is constant and the current varies from zero to maximum value.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

et al. 2017

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Abstract:The gain of a LLC resonant converter can vary with the loads that can be used to improve the efficiency and power density for some special applications, where the maximum gain does not apply at the heaviest loads. However, nonlinear gain characteristics can make the converters unstable during a major disturbance. In this paper, the stability of an LLC resonant converter during a major disturbance is studied and a trigger control scheme is proposed to improve the converter's stability by extending the converter's operational range. Through in-depth analysis of the gain curve of the LLC resonant converter, we find that the switching frequency range is one of the key factors determining the system's stability performance. The same result is also obtained from a mathematical point of view by utilizing the mixed potential function method. Then a trigger control method is proposed to make the LLC resonant converter stable even during a major disturbance, which can be used to extend the converter's operational range. Finally, experimental results are given to verify the analysis and proposed control scheme.

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Accurate ZVS Analysis for Magnetic Design and Efficiency Improvement of Full-Bridge LLC Resonant Converter

Cited by 101 publications

References 12 publications

Unregulated series resonant converter for interlinking DC nanogrids

Unregulated series resonant converter for interlinking DC nanogrids

A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

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