LLC resonant converter with matrix transformer

Huang, Daocheng; Ji, Shu; Lee, Fred C.

doi:10.1109/apec.2014.6803447

Cited by 35 publications

(18 citation statements)

References 20 publications

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“…As an example of the split phases within single converter, [5] demonstrates a 1 kW 1MHz LLC converter with four phases. The conventional single transformer is separated into four small transformers.…”

Section: A Multiphase and Current Sharingmentioning

confidence: 99%

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: 99%

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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“…Transformer winding losses are significantly reduced as well as the leakage inductances [39], [40]. Furthermore, the four transformers can be integrated into two-core structure by means of flux cancellation, thus, resulting in reduced core volume and core loss [40]. The first generation of the prototype LLC converter, as shown in Fig.…”

Section: Llc Converter With Integrated Matrix Transformermentioning

confidence: 99%

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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“…The main drawback of resonant converter is large RMS of rectified current compared with PWM converter. The basic method is paralleling SR devices [8][9], but the synchronous rectification imitating diodes' action in LLC is difficult to realize because of the SR devices' package and circuit's inductance. Too many paralleling SR devices layout will make SR more difficult to work well and cause the reliability problems.…”

Section: Introductionmentioning

confidence: 99%

The third harmonics current injection scheme for LLC topology to reduce the RMS of the output current

Ren

Zhang

Shen

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The Intermediate Bus Converter (IBC) is a middle stage converter in the distribution power architecture, characterized with high efficiency, high frequency and high power density, to realize the DC voltage transform and isolated function. In this paper, the unregulated LLC DC transformer's (LLC-DCT) inherent problem which leads to a large conduction loss in IBC application has been discussed. A new intuitive topology with third order harmonic current injection has been proposed to reduce the RMS of the resonant and secondary current. At the end, the theoretical analysis and the proposed optimal topology design are verified by an 800W, 100kHz, 400V/12.5V LLC-DCT prototype.

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LLC resonant converter with matrix transformer

Cited by 35 publications

References 20 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

The third harmonics current injection scheme for LLC topology to reduce the RMS of the output current

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