Efficiency-Oriented Optimal Design of the LLC Resonant Converter Based on Peak Gain Placement

Fang, Xiang; Hu, Haibing; Chen, Fanglin; Somani, Utsav; Auadisian, E.; Shen, John; Batarseh, Issa

doi:10.1109/tpel.2012.2211895

Cited by 185 publications

(58 citation statements)

References 22 publications

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“…Related to the resonant characteristic of the LLC topology [6][7][8], the DC voltage gain maintains high values when f op is near the resonant point, while the gain curves are confined progressively for the high order harmonics. As a result, the input impedances Z n for n ≥ 3 cases are very large, and they force the corresponding integral terms near zero.…”

Section: Selection Constraints Of the Parallel Topologymentioning

confidence: 99%

“…Famous for the advantages of simple structure, wide soft-switching range, outstanding voltage regulation performance and high efficiency, the LLC converter is broadly applied in diverse applications, such as battery chargers, renewable and distributed energy generation, and switched mode power supplies. At present, on the basis of the classical LLC topology, considerable research has been implemented concentrating on the optimal parameter design [6][7][8], advanced control strategy [9,10], current balancing [11], bidirectional power transmission [12,13], high-frequency analysis [14,15], and over-current protection [16,17].…”

Section: Introductionmentioning

confidence: 99%

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A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

et al. 2017

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Abstract:In this paper, two multi-element resonant DC-DC converters are analyzed in detail. Since their resonant tanks have multiple resonant components, the converters display different resonant characteristics within different operating frequency ranges. Through appropriate design, both of the two proposed converters successfully lower the conversion losses and, meanwhile, broaden the voltage gain ranges as well: one converter is able to take full usage of the third order harmonic to deliver the active power, and thus the effective utilization rate of the resonant current is elevated; while the another minimizes the entire switching losses for power switching devices by restricting the input impedance angle of the resonant tank. Besides, the loss distribution is analyzed for the purpose of guiding the component design. In the end, two 500 W prototypes are fabricated to test the theoretical analyses. The results demonstrate that the two proposed converters can achieve wide voltage gain with the small frequency deviation, which noticeably contributes to highly efficient conversion. Their peak efficiencies are measured as 95.4% and 95.3%, respectively.

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Section: Selection Constraints Of the Parallel Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

et al. 2017

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“…For middle level power applications, among various DC-DC converters developed so far, LLC resonant converters, has the advantages as the simplicity of circuit configurations and the acquisition of big voltage gains in narrow frequency interval when compared to the serial/parallel resonant converters. Due to the limitations of high current effects, output regulation and power density of traditional resonant converters, novel topologies and switching modes for the design of LLC resonant converters have been proposed in the literature [6][7][8][9]. The most challenging part of thin power card design with high power density is the transformer design.…”

Section: Introductionmentioning

confidence: 99%

“…For medium power solid state lighting applications, a new topology along with the use of film technology capacitors which has a longer lifetime than standard electrolytics is presented for effective power factor correction to comply with the harmonic injection and energy saving standards [22]. Methods proposed in [7][8][9][10][11][12][18][19] are used to optimize the efficiency of power sources used in LCD TVs. By using LLC resonance converters, 89.43% efficiency for 40 inch LCD TV in [7], high efficiency (full loading 96.5%) and low cost for power sources used in 42 inch PDP TVs in [8] are achieved.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a power supply unit for low profile LCD/LED TVs

Vural

Demirel²,

Erkmen³

2017

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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The ongoing demand for smaller and lighter power supplies is driving the motivation to increase power density while maintaining a robust design compatible with international harmonic standards. Transformer design is a major challenge for low profile and high power density TV power cards. In addition to these, for electromagnetic interference standard and for providing efficient thermal management for heat emission, it is required to minimize EMI noise. In this study, by taking these stated criteria into consideration, a TV power card has been designed, which has 220W output power and can be used in low profile televisions. Proposed power card will meet desired critical parameters such as surface area and output power of the referenced card which has 13.5mm height, the heat, and power consumption at standby mode. Moreover, it is designed with 10mm height limit without any engraving on PCB in a way that it will meet International Electrotechnical Commission (IEC) current harmonic standard to which TVs are subjected. Experimental results demonstrate that the proposed power supply with 10mm height has 34% higher power density with respect to its counterpart having 13.5 mm height.

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“…However, if the pre-charge mode is considered with the resonant tank design under the PFM control, the LLC converter has a wider output range, resulting in a smaller ratio K and L m for the same frequency range. In addition, it will increase the primary conduction and turn-off losses, and deteriorate the efficiency in normal operation [8]- [10]. Therefore, the PFM&PWM control is adopted here [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Resonant Tank Design Considerations and Implementation of a LLC Resonant Converter with a Wide Battery Voltage Range

Sun¹,

Wu²,

Hu³

et al. 2015

Journal of Power Electronics

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This paper illustrates resonant tank design considerations and the implementation of a LLC resonant converter with a wide battery voltage range based on the fundamental harmonic approximation (FHA) analysis. Unlike the conventional design at zero load, the parameter K (the ratio of the transformer magnetizing inductor L m to the resonant inductor L r ) of the LLC converter in this paper is designed with two charging points, (V o_min , I o_max1 ) and (V o_max , I o_max2 ), according to the battery charging strategy. A 2.9kW prototype with an output voltage range of 36V to 72V dc is built to verify the design. It achieves a peak efficiency of 96%.

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Efficiency-Oriented Optimal Design of the LLC Resonant Converter Based on Peak Gain Placement

Cited by 185 publications

References 22 publications

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

Design and optimization of a power supply unit for low profile LCD/LED TVs

Resonant Tank Design Considerations and Implementation of a LLC Resonant Converter with a Wide Battery Voltage Range

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