• Title/Summary/Keyword: LLC Resonant Converter

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Bidirectional LLC-LC Resonant Converter With Notch Filter (노치 필터 적용 양방향 LLC-LC 공진컨버터)

  • Jang, Ki-Chan;Kim, Eun-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.6
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    • pp.411-420
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    • 2021
  • In this paper, bidirectional LLC-LC resonant DC-DC converter with notch filters in the primary side of resonant circuits is proposed. Even if resonant capacitors are used on the primary and secondary sides, the proposed converter can operate with the high gain characteristics of the LLC resonant converter without mutual coupling of resonant capacitors, regardless of the direction of power flow. In addition, by applying notch filters, the proposed converter can operate with a wider gain control range and can cope with overload and short circuit. The analysis and operating characteristics of the proposed bidirectional LLC-LC resonant converter are investigated. A 3.3 kW prototyped bidirectional LLC-LC resonant converter connected to 750 VDC buses is designed and tested to verify the validity and applicability of this proposed converter.

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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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.

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.

A Novel Dual Full-Bridge LLC Resonant Converter for CC/CV Charge of the Battery for Electric Vehicles (전기자동차용 배터리의 CC/CV 충전을 위한 새로운 듀얼 풀브리지 LLC 공진형 컨버터)

  • Vuand, Hai-Nam;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.337-338
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    • 2016
  • This paper introduces a novel dual Full-Bridge LLC(FBLLC)resonant converter for CC/CV Charge of the Battery for Electric Vehicles. One full-bridge LLC resonant converter operates with a fixed-resonant network and the other operates with a variable-resonant network for CC and CV mode operations. The proposed converter can achieve ZVS for all the primary switches and exhibits a highefficiency characteristics like aconventional single FBLLC resonant converter. In addition, the variable-resonant network helps minimize the switching-frequency variation. The dual structure makes the proposed converter possible to achieve ZVS and nearly ZCS for all the primary switches in CC mode operation. Since the proposed converter can operate at a fixed frequency in CV mode, it can minimize the circulating current and achieve nearly ZCS. A 6.6 kW prototype converter is implemented to verify the validity of proposed converter and the maximum efficiency of 98.3% was achieved.

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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.

Optimal Design of the LLC HB Resonant Converter for Notebook Computer Adapter (노트북 컴퓨터 어댑터용 LLC 하프 브리지 공진형 컨버터 최적설계)

  • Yoo, Byoung-Seon;Kim, Chang-Sun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.8
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    • pp.1418-1423
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    • 2007
  • The topology of LLC half bridge resonant converter provides ZVS characteristic. The voltage stress and current stress are smaller than that of the general resonant converters. So the LLC HB resonant converter can be considered as a optimal circuit for the notebook computer adapter. In the adapter design, we should consider the weight, the size and the overheat of the adapter. Thus the higher efficiency is an essential particular. First of all, the optimal design of transformer is the most important facts. Some parameters should be considered in order to get the highest efficiency. The adapter is designed through the considering of these parameters including the PFC circuit as the pre-regulator. It converts AC line input into about DC 390V link voltage of the LLC HB converter input and the converter has 16V/90W ratings. The efficiency measured is about up to 93%.

A Study on LLC Resonant Transformer Design with the Winding Method of Automatic Type suitable for LLC Resonant Converter (LLC 공진 컨버터에 적합한 자동화 권선 LLC 공진 변압기 설계에 관한 연구)

  • Bae, Jun-Hyung;Kim, Jong-Hae
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.1108-1111
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    • 2019
  • This paper presents the comprehensive transformer design methodology with the winding method of automatic type suitable for LLC resonant converter. The problem with conventional LLC resonant transformer is that it is difficult to implement the winding method of automatic type because all windings are wound in one bobbin. Therefore, the LLC resonant transformer, which is capable of the winding method of automatic type to multiple section bobbin without insulation tape and barrier tape, is proposed in this paper and the design procedure of the proposed LLC resonant transformer is also shown. Modeling and analysis of the proposed LLC resonant transformer using Maxwell 3D simulation tool are described in detail and a protype 150W LLC resonant converter using the proposed LLC resonant transformer manufactured by 3D modelling is also verified through the experimental test.

A Study on the Characteristics Analysis of LLC AC to DC High Frequency Resonant Converter capable of ZVZCS (ZVZCS가 가능한 LLC AC to DC 고주파 공진 컨버터의 특성 해석에 관한 연구)

  • Kim, Jong-Hae
    • Journal of IKEEE
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    • v.25 no.4
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    • pp.741-749
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    • 2021
  • This paper presents the current-fed type LLC AC to DC high frequency resonant converter capable of ZVZCS(Zero-Voltage and Zero-Current Switching). The current-fed type LLC AC to DC high frequency resonant converter proposed in this paper could operate not only in ZVS(Zero-Voltage Switching) operation by connecting the resonant capacitors(C1, C2) in parallel across the switching devices but also in ZCS(Zero-Current Switching) operation of the secondary diode. The ZVS and ZCS operations can reduce the turn-on loss of the switching devices and the turn-off loss of the secondary diodes, respectively. The circuit analysis of current-fed type LLC AC to DC high frequency resonant converter proposed in this paper is addressed generally by adopting the normalized parameters. The operating characteristics of proposed LLC AC to DC high frequency resonant converter were also evaluated by using the normalized control parameters such as the normalized control frequency(μ), the normalized load resistor(λ) and so on. Based on the characteristic values through the characteristics of evaluation, an example of the design method of proposed LLC AC to DC high frequency resonant converter is suggested, and the validity of the theoretical analysis is confirmed using the experimental results and PSIM simulation.