• Title/Summary/Keyword: LLC resonant converter

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Analysis of No-load Characteristics in LLC Resonant Converter (LLC 공진형 컨버터의 무부하 특성 분석)

  • Kwon, Min-Jun;Lee, Woo-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.3
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    • pp.398-405
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    • 2018
  • LLC resonant converter is popular with industrial fields because it can be achieved high efficiency by zero voltage switching (ZVS). As interest grew, analysis of characteristics in LLC resonant converter have been actively studied. Generally, characteristic of LLC resonant converter is analyzed based on first harmonic approximation(FHA). The FHA analysis represents the characteristics of LLC resonant converter by obtaining the series resonant operation. FHA analysis of LLC resonant converter in load condition is correct. but it is not correct in no load condition. This paper proposed analysis of characteristics considering the parasitic components to overcome the limitation of FHA and analyze no-load characteristics. The validity of the proposed method has been investigated by simulation and experimental results.

Analysis and Design considerations of LLC Resonant Converter Including Parasitic Components

  • Lee, Byoung-Hee;Kim, Chong-Eun;Moon, Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.511-513
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    • 2008
  • Since conventional analysis of LLC resonant converter has a limit to explain a practical operation of LLC Resonant Converter, LLC resonant converter designed by conventional analysis can not regulate output voltage in several conditions. To solve this problem, analysis and design of LLC resonant converter including parasitic components is proposed. Experimental results are shown to confirm the feasibility of the proposed method.

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Development of Battery Charger for Electric Vehicle using the LLC Resonant Converter (LLC 공진형 컨버터를 적용한 전기자동차 고압배터리 충전기 개발)

  • Kim, Gyoung-Man;Yoo, Jong-Uk;Kim, Tae-Kwon;Kang, Chan-Ho;Chun, Tae-Won
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.443-447
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    • 2013
  • This paper deals with LLC resonant converter of on-board charger for electric vehicle charging. Generally, the on-board charger must have a very widely charging voltage, higher efficiency, higher power factor, lower volume and lower weight. For reducing the switching losses, voltage and current stress of the device, the on-board charger is apply the half-bridge LLC resonant converter topology. To have a wide voltage range, it is design the hardware parameters and determine the switching frequency range of the LLC resonant converter. The experimental results show a wide charge voltage.

Design of Control System for LLC Resonant Converter (LLC 공진형 컨버터 제어시스템 설계)

  • Kim, Eui-Hyun;Ahn, Hyun-Sik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.1
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    • pp.129-137
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    • 2017
  • In this paper, we propose a digital controller design methodology for an LLC resonant converter which has been widely used due to the advantages of low switching loss and high efficiency. We establish a mathematical model of an LLC resonant converter using the extended describing function concept and propose a controller design method based on the Ziegler Nichols control parameter tuning criteria. The voltage controller of an LLC resonant converter is designed based on the derived small signal model and the performance of the controller is verified by MATLAB simulations. The validity and the control performance of the designed voltage controller for the LLC resonant converter is analyzed through some simulations for the case of load variations and circuit modeling errors.

Design Procedures of LLC Resonant Converter for Electric Vehicle On-Board Charger (전기자동차 OBC용 LLC 공진형 컨버터의 설계절차)

  • Jung, Yong-Chae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.1
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    • pp.91-96
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    • 2014
  • nowadays, many researches for plug-in hybrid electric vehicles have been actively carried out to improve the gas mileage in comparison with mass-produced hybrid electric vehicles. In this paper, the on-board charger for plug-in hybrid electric vehicles is studied for obtaining the high efficiency. The on-board charger consists of two phase interleaved PFC circuit and LLC resonant converter. The new design procedures of LLC resonant converter are proposed in this paper. These are very simple and powerful method. In order to verify the abovementioned contents, the LLC resonant converter is designed and tested by using PSIM tool.

Multi-Output LLC Resonant Converter (다 출력 LLC 공진 컨버터)

  • Kang, Seong-In;Kim, Joo-Hoon;Kim, Eun-Soo;Park, Jun-Ho;Lee, Jae-Sam;Huh, Dong-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.4
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    • pp.323-332
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    • 2009
  • In this paper, operating characteristics of multi-output LLC resonant converter are described and analyzed. Especially, voltage gain characteristics and an equivalent resonant frequency in the multi-output LLC resonant converter are changed by the influences due to the several load conditions and the secondary leakage inductances of multi-output transformer. Based on the theoretical analysis and simulation results considered the characteristics of voltage gain and load variation, prototype of the 540W 3-output LLC resonant converter for 42 inch PDP TV power module is built and the experimental results are described.

Research on the Multi - purpose Nd:YAG Laser Power System using LLC Converter (LLC 공진형 컨버터를 사용한 다용도 Nd:YAG 레이저 전원장치 설계)

  • Zheng, Tao;Kim, Hee-Je;Lee, Jae-cheol;Xu, Guo-Cheng
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.6
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    • pp.885-890
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    • 2015
  • LLC resonant converter has been widely used because of its high efficiency and high energy density. In this paper, we designed a LLC resonant converter as the main power supply of the Nd:YAG pulse laser. First harmonic approximation (FHA) is used to model the LLC resonant converter. FHA equivalent circuit model and the transfer function of the LLC resonant converter is proposed. Soft start technology is also used to suppress the surge current. The laser output simulation test result is identical with the practical test, the laser energy of every pulse can reach up to 2.5J, and the pulse per second (PPS) can be adjusted from 6 to 18. The power system is verified stable and reliable by both of the simulation and experiment results.

1-stage Asymmetrical LLC Resonant Converter with Low Voltage Stress Across Switching Devices (낮은 전압 스트레스의 스위치를 가지는 1-stage 비대칭 LLC 공진형 컨버터)

  • Kim, Choon-Taek;Kim, Seong-Ju;La, Jae-Du;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.8
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    • pp.1101-1107
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    • 2013
  • A light emitting diodes(LED) lighting has been increasingly used due to its low power consumption, long life time, high efficiency, and environment friendly characteristics. Also various power converters has been applied to drive these LED lighting. Among many power converters, a LLC resonant converter could be applied for LED lighting because of its high efficiency and high power density. Furthermore, the function of power factor correction(PFC) might be added. In this paper, 1-stage asymmetrical LLC resonant converter is proposed. The proposed converter performs both input-current harmonics reduction and PFC using the discontinuous conduction mode(DCM). The proposed 1-stage LLC resonant converter approach has the lower voltage stress across switching devices and achieve the zero voltage switching(ZVS) in switching devices. To verify the performance of the proposed converter, simulation and experimental results from a 300[W] prototype are provided.

A Study on LLC Resonant Converter Employing Coupled Inductor to Reduce Output Current Ripple (커플드 인덕터를 활용하여 출력 전류 리플을 저감하는 LLC 공진형 컨버터에 관한 연구)

  • Lee, Yong-Chul;Kang, Min-Hyuck;Kang, Chan-Ho;Hong, Sung-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.3
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    • pp.208-216
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    • 2018
  • In this paper, an LLC resonant converter employing two coupled inductors on the secondary side of the converter is proposed. The conventional LLC converter exhibits serious power loss during secondary winding of the transformer because of generation of tremendous output current ripples. To overcome this problem, an LLC resonant converter with a current doubler as a rectifying circuit was recently proposed. However, the current-doubler rectifying circuit requires coupled inductors with a high coupling ratio to retain the designed resonance characteristics. Therefore, an additional hardware filter is required at the output stage to address large output current ripples. Additional design procedures are also necessary because the inductance component of the added filter affects the designed resonant network. To solve this issue, an LLC resonant converter employing two coupled inductors is proposed in this paper. Mathematical analysis shows that the proposed secondary-side current-doubler circuit does not affect the designed resonance characteristics. The operating principles and theoretical analyses are proven through a simulation and experiments with a 54 V/28 A prototype.

Design Consideration of Half-Bridge LLC Resonant Converter

  • Choi, Hang-Seok
    • Journal of Power Electronics
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    • v.7 no.1
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    • pp.13-20
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    • 2007
  • LLC resonant converters display many advantages over the conventional LC series resonant converter such as narrow frequency variation over wide range of load and input variation and zero voltage switching even under no load conditions. This paper presents analysis and design consideration for the half bridge LLC resonant converter. Using the fundamental approximation, the gain equation is obtained, where the leakage inductance in the transformer secondary side is also considered. Based on the gain equation, the practical design procedure is investigated to optimize the resonant network for a given input/output specifications. The design procedure is verified through an experimental prototype of the 115W half-bridge LLC resonant converter.