Simplified Optimal Trajectory Control (SOTC) for LLC Resonant Converters

Feng, Weiyi; Lee, F. C.; Mattavelli, Paolo

doi:10.1109/tpel.2012.2212213

Cited by 152 publications

(30 citation statements)

References 23 publications

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“…However, when it comes to LLC converter, the extra state variable greatly increase the complexity. If fixed at resonant frequency, the simplified trajectory control can still achieve very fast dynamic performance [33]. In general, the trajectory based control requires inductor current and load current sensing, which could be complicated and lossy.…”

Section: B Bang Bang Charge Control For Fast Dynamic Responsementioning

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: B Bang Bang Charge Control For Fast Dynamic Responsementioning

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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“…This proposed controller incorporates the state-trajectory control techniques [45], [46]. A multitudes of technology breakthroughs have been reported in recent literature including: soft start-up and short-circuit protection to minimize stresses; auto-tuning to minimize SR losses; fast load transient response; burst mode for improved light load efficiency [47]- [52]. These techniques, over several generations of developments, have reached a point where they can finally be realized using a low-cost digital controller to control the high frequency LLC converters.…”

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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“…More recently, the dynamic analysis and control design of the LLC resonant converters have also received increasing research attentions [10][11][12][13][14] because modern energy conversion systems demand good dynamic performance and high reliability for DC-to-DC converters. The purpose of this paper is to develop a new control scheme that could enhance the dynamic performance and reliability of LLC series resonant converters adopted to modern energy conversion systems.…”

Section: Introductionmentioning

confidence: 99%

Current Mode Control for LLC Series Resonant DC-to-DC Converters

Jang¹,

Pidaparthy

Choi

2015

Energies

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Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter.

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Simplified Optimal Trajectory Control (SOTC) for LLC Resonant Converters

Cited by 152 publications

References 23 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

Current Mode Control for LLC Series Resonant DC-to-DC Converters

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