Design and Optimization of a 380V-12V High-Frequency, High-Current LLC Converter with GaN Devices and Planar Matrix Transformers

Mu, Mingkai; Lee, Fred C.

doi:10.1109/jestpe.2016.2586964

Cited by 162 publications

(47 citation statements)

References 7 publications

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“…Another highlight of this structure is that the connection point of the multiple phases could be designed at the DC side, so that the terminal loss/winding loss generated by the high frequency AC current is reduced. Similarly, 1.5% of efficiency increase is achieved by using eight phases [6].…”

Section: A Multiphase and Current Sharingmentioning

confidence: 90%

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Chen¹,

Liu²

2017

CPSS TPEA

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Abstract-LLC converter has been the simplest topology since long to achieve soft switching and overall the highest performance within small form factor at converter level. This paper discusses the latest advances of LLC converter from the perspective of topology and control. The technology ranges from high current, fast dynamic response to wide operational voltage range. The application mainly falls in the scope of server and data center, and may also cover telecom, PV, battery charging, etc.Index Terms-LLC, review, survey, current sharing, multiphase, interleave, phase shedding, passive impedance match, SR drive, fast dynamic, current mode control, current sensing, wide voltage range, hold up, high voltage gain.

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Section: A Multiphase and Current Sharingmentioning

confidence: 90%

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Chen¹,

Liu²

2017

CPSS TPEA

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“…15(b), leading to a much improv-ed efficiency as shown in Fig. 16 [42]. It should be noted that the improvement of efficiency is not at the expense of power density.…”

Section: Llc Converter With Integrated Matrix Transformermentioning

confidence: 95%

Application of GaN Devices for 1 kW Server Power Supply with Integrated Magnetics

Lee¹,

Li²,

Liu³

et al. 2016

CPSS TPEA

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Abstract-In today's power electronics products, quality and reliability are given. Great emphases are placed on high efficiency, high power density and low cost. With recent advances made in gallium nitride power devices (GaNs), it is expected that GaNs will make significant impacts to all three areas mentioned above. Thanks to the absence of reverse recovery charge and smaller junction capacitances, the turnon loss of GaN is significantly reduced and Turn-off loss and driving loss are negligible, for the first time. These desired properties coupled with ZVS techniques will drastically reduce all switching related losses, thus enabling GaN to operate at a switching frequency more than ten times higher than its silicon counterparts. To illustrate the impact of GaN on efficiency, density and even design practice, a 1 kW server power supply is demonstrated which employs an interleaved CRM totem-pole PFC followed with an LLC resonant converter. Both operate beyond 1 MHz. All magnetic components are integrated into PCB with much reduced EMI noises, thus, only a simple onestage EMI filter is required. The system achieves a power density more than 150 W/in 3 , an efficiency above 96%, and much improved manufacturability with minimum labor content.

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“…Through Fourier transform, e LLC (t) can be expressed as Equation (13), and thereby the corresponding input resonant current i LLC (t) is obtained as Equation (14). ϕ n (n = 1, 3, 5, .…”

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%

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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Design and Optimization of a 380V-12V High-Frequency, High-Current LLC Converter with GaN Devices and Planar Matrix Transformers

Cited by 162 publications

References 7 publications

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Application of GaN Devices for 1 kW Server Power Supply with Integrated Magnetics

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

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