Search query: 3 phase LLC

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abstract: A new single stage, isolated, 3 phase AC/DC converter at 20KW level for electric vehicle charging purpose is proposed. The converter combines the dual stage of PFC+LLC converter into a single stage and thus achieves less than 2% total semiconductor losses. Intermediate DC bus is maintained at 900V to reduce the THD below the regulatory requirements and low switching losses of SiC switches enable excellent efficiency under these conditions. LLC converter control is done in a traditional way with frequency and PFC synchronizes with this LLC frequency to maintain good power factor with duty cycle modulation. System has been simulated in PLECS. Hardware result is also shown.
author_names: Navneet Kumar Mangal

Sankalp Shembekar
title: A New Single Stage, Isolated, 3 phase AC/DC Converter
venue: 2019 IEEE Transportation Electrification Conference (ITEC India)
year: 2019

abstract: To assess the efficacy, insulin dose, safety and immunogenicity when people with type 1 diabetes mellitus switched between MYL 1501D and reference insulin glargine (Lantus(r) Sanofi Aventis US LLC, Bridgewater, New Jersey)
author_names: Thomas C Blevins

Abhijit Barve

Yaron Raiter

Patrick Aubonnet

Sandeep N Athalye

Bin Sun

Rafael Muniz
title: Efficacy and safety of MYL 1501D versus insulin glargine in people with type 1 diabetes mellitus: Results of the INSTRIDE 3 phase 3 switch study
venue: Diabetes, obesity metabolism
year: 2019

abstract: The LLC converter is considered the most efficient topology in server and telecom applications. And, it has been demonstrated that three interleaved LLC converters can achieve further efficiency improvement at the 3KW power level. However, the magnetic components for multiphase LLC are complex, bulky, and difficult to manufacture in a cost effective manner. In this paper, a high frequency GaN based three phase LLC converter is utilized to attempt to address these challenges. With GaN operating at 1 megahertz, all magnetic components, namely three inductors and three transformers, can be integrated in one common structure while all magnetic windings are contained in a compact 4 layer PCB with 3 oz. copper. The proposed structure can be easily and cost effectively manufactured in high quantities. Furthermore, up to a 20db reduction of common mode noise, from 150KHz up to 30MHz, can be realized if 2 additional PCB layers are employed for proposed CM noise shielding. A 3kW 400V/48V 3 phase prototype is demonstrated, with an expected peak efficiency of 97.4% and a power density of 450W/in3 (28 kW/L)
author_names: Rimon Gadelrab

Fred C Lee

Qiang Li
title: Three Phase Interleaved LLC Resonant Converter with Integrated Planar Magnetics for Telecom and Server Application
venue: 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2020

abstract: For the conventional vehicle, an efficient and effective heat source that provides autonomous exhaust temperature control is of interest, and one solution is a diesel burner which needs to adjust its air delivery based on transient operating conditions through a three phase motor drive system powered by a 12V lead acid battery. The system proposed in this paper consists of a series resonant LLC MOSFET full bridge converter, which provides high efficiency energy transfer through implementing Zero Voltage Switching, and an IGBT inverter which provides the high side phase currents to a 1kW brushless DC motor. Experimental results on this prototype system demonstrate the LLC DC/DC part efficiency is 97.6% and the inverter efficiency is 92%
author_names: Allan Ray Taylor

Chenguang Jiang

Kevin Hua Bai

Adam Kotrba

Argun Yetkin

Arda Gundogan
title: Design of a high efficiency 12V/1kW 3 phase BLDC motor drive system for diesel engine emissions reductions
venue: 2013 IEEE Energy Conversion Congress and Exposition
year: 2013

abstract: This paper proposes a new 3 phase interleaved LLC resonant DC DC converter and its control scheme. The proposed circuit consists of three conventional interleaved LLC resonant DC DC converters and each converter operates with p/3 of phase difference respectively. Therefore the current ripple of the output capacitor can be significantly reduced and the life cycle of the converter will be extended. To verify the validity of the proposed converter and digital scheme, an experiment with a prototype 1kW (12V/84A) DC DC converter was implemented and its results are presented in this paper.
author_names: Jae-Eul Yeon

Won-Seok Kang

Kyu-Min Cho

T Y Ahn

Hee-Jun Kim
title: Multi phase interleaved LLC SRC and its digital control scheme
venue: SPEEDAM 2010
year: 2010

abstract: This paper describes the development of a high voltage, high power, and high efficiency LLC converter used in a delta 3 phase rectifier that meets the requirements imposed by today's telecom market. Initially, a comparative analysis of different LLC topologies is performed to determine the best option for the targeted application. Then, an empirical method, based on the plant frequency response, is introduced as a practical technique to design the voltage and current loop compensators. Next, a novel strategy is utilized to control the synchronous rectifier by executing an additional algorithm in the system microcontroller. Finally, a special filter is added to the voltage loop to mitigate the output voltage noise while maintaining a good dynamic performance. The techniques and solutions discussed in this paper have been successfully proven and implemented in a soon to be commercialized 12kW telecomgrade rectifier.
author_names: Yuling Huang

Lucas Sinopoli

R D Petkov

Gueorgui Anguelov
title: High voltage, high power, high efficiency, digitally controlled LLC converter for telecom applications
venue: 2014 IEEE 36th International Telecommunications Energy Conference (INTELEC)
year: 2014

abstract: It is expected that wide bandgap devices like silicon carbide MOSFETs and gallium nitride HEMTs could replace Si devices in power electronics converters to reach higher system efficiency, e.g. a 3 phase 380VAC bidirectional battery charger for electric vehicles. This paper uses the conventional half bridge LLC topology to build a 10kW all SiC bidirectional charger. As a well known topology for the unidirectional charger, it has not been comprehensively explored for the usage of the bidirectional energy flow, which falls into the scope of this paper. A double pulse test platform is utilized to provide the accurate power losses, which, combined with the state space model deriving the accurate switching current waveforms eventually accurately, estimates the system efficiency. Based on this model, to further enhance the system efficiency the DC bus voltage is varied while keeping the LLC DC/DC converter running at the resonant frequency through the whole power range. Experimental results validated our proposed approach that such topology could realize the bidirectional power flow with zero voltage switching turn on. With varying the DC bus voltage, the V2G and G2V modes reach ~96% wall to battery efficiency.
author_names: Chenguang Jiang

Bo Lei

Hui Teng

Hua Bai
title: The power loss analysis and efficiency maximization of a silicon carbide MOSFET based three phase 10kW bi directional EV charger using variable DC bus control
venue: 2016 IEEE Energy Conversion Congress and Exposition (ECCE)
year: 2016

abstract: Mesoporous lithium metal phosphates are an important class of materials for the development of lithium ion batteries. However, there is a limited success in producing mesoporous lithium metal phosphates in the literature. Here, a lyotropic liquid crystalline (LLC) templating method was employed to synthesize the first examples of LiMPO4 (LMP) of Mn(II) Co(II) and Ni(II) A homogeneous aqueous solution of lithium and transition metal nitrate salts, phosphoric acid (PA) and surfactant (P123) can be spin coated or drop cast coated over glass slides to form the LLC mesophases which can be calcined into mesoporous amorphous LMPs (MA LMPs) The metal salts of Mn(II) Co(II) and Ni(II) produce MA LMPs that crystallize into olivine structures by heat treatment of the LLC mesophase. The Fe(II) compound undergoes air oxidation. Therefore, both Fe(II) and Fe(III) precursors produce a crystalline Li3 Fe2 (PO4 )3 phase at over 400 degC. The MA LMPs show no reactivity towards lithium, however the crystalline iron compound exhibits electrochemical reactivity with lithium and a good electrochemical energy storage ability using a lithium ion battery test.
author_names: Isil Uzunok

Jeonghun Kim

Tuluhan Olcayto Colak

Dae Sik Kim

Hansu Kim

Minjun Kim

Yusuke Yamauchi

Omer Dag
title: Lyotropic Liquid Crystalline Mesophases Made of Salt Acid Surfactant Systems for the Synthesis of Novel Mesoporous Lithium Metal Phosphates.
venue: ChemPlusChem
year: 2019

abstract: Wide band gap (WBG) power devices, such as Silicon Carbide (SiC) and Gallium Nitride (GaN) devices, have been innovatively applied in the data center power converters, which are based on the high voltage DC (HVDC) power distribution architecture, to evaluate the potential efficiency improvement. For the front end AC DC rectifier, a buck rectifier using SiC devices was implemented. The SiC devices were tested at first to obtain the static and switching characteristics. The number of devices in parallel, the switching frequency and the input/output filters were investigated. A prototype of 7.5 kW, 3 phase 480 VAC input, 400 VDC output front end rectifier was built and tested. The peak efficiency reaches up to 98.55% and the full load efficiency is 98.54% For the intermediate DC DC bus converter, the impact of the GaN devices on the LLC resonant converter efficiency was evaluated and compared with the Si counterparts. Based on the device loss analysis and the FEA simulation on the transformer winding loss, the GaN devices exhibited the reduced device loss, and also the capabilities to reduce the transformer winding loss. A 300 W, 400 VDC input, 12 VDC output GaN device based DC DC bus converter was built and tested by 96.3% peak efficiency and 96.1% full load efficiency.
author_names: Weimin Zhang

Ben Guo

Fan Xu

Yutian Cui

Yu Long

Fred Wang

Leon M Tolbert

Benjamin J Blalock

Daniel J Costinett
title: Wide bandgap power devices based high efficiency power converters for data center application
venue: 2014 IEEE Workshop on Wide Bandgap Power Devices and Applications
year: 2014

abstract: In the article the inconsistencies of the original diet requirements are identified and evaluated. The study was carried out at LLC <APK Plemzavod Yamskoi> (Moscow oblast' Russia) The study took into account the following zootechnical indicators: chemical composition and nutritive value of animal feed rations of lactating cows, feed intake animal, and data of a monthly monitoring of milkings in the economy. Optimization of the feeding diet for lactating in the first phase of cows contribute to the realization of genetic potential productivity of animals. Feeding lactating cows better be divided into three phases: phase 1 0 21 day, phase 2 day 21 100, and 3 phase 100 and to start. In order not to lose milk production and maintain animal health, it is necessary to use a balanced diet in all phases of feeding. After calving the body loses a lot of energy and nutrients, disturbed system immune system, all the systems involved and works hard to feed their young. The first phase is the key to replenishing forces of the body. In the second phase the animal does not need such a high content of energy, protein, vitamins, and micro and macroelements in the diet. However, the second phase is the peak of milk production, and maintaining the usefulness of feeding is equally important. The third phase is a decline in milk production, it is the final. In this period it is necessary gradually to transfer animals on a<<dry diet> This period is very important, because it serves as a preparatory stage for delivery. Developed new balanced energy, nutrients and biologically active substances to the diets will increase animal performance by 5 10
author_names: Mikhail Mikhailovich Lugovoi
title: Analiz i optimizatsiia ratsiona kormleniia laktiruiushchikh korov cherno pestroi golshtinizirovannoi porody v pervuiu fazu laktatsii
year: 2016