• Title/Summary/Keyword: LLC Resonant Converter

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200[W] Half-Bridge LLC Series Resonant Converter for driving LED Lamp (LED 조명장치 구동용 200[W]급 하프브리지 LLC 직렬공진형 컨버터)

  • Han, Woo-Yong;Park, Hyo-Sik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.11
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    • pp.4483-4488
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    • 2010
  • In comparison with some other light sources, LED has merits such as long lifetime, pollution free, and high energy efficiency. Lately, due to development of LED with high brightness and capacity, LED, which has been applied in display system only, has applied in the field of lighting system. Driving current of power LED has to be controlled below the designed value. In this paper, half-bridge LLC series resonant converter, which has the current limiting function, has been described. Half-bridge LLC series resonant converter allows in relatively wide input voltage and output load range when compared to the other resonant converter. Also, it is possible to reduce a magnetic component, because leakage inductance of transformer is used as a resonant inductance. It has been validated by designing and testing 200[W] half-bridge LLC converter of DC24[V] output voltage for LED lamp driver, which includes a current limiting function and power factor correction(PFC) function.

LLC Resonant and Synchronous Buck Converter Based High Efficiency Battery Charger for Energy Storage Systems (에너지 저장 시스템을 위한 LLC/동기 벅컨버터 기반 고효율 배터리 충방전기 설계)

  • Lee, Taeyeong;Lee, Il-Oun;Cho, Younghoon;Kim, Hangoo;Cho, Junseok;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2016.11a
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    • pp.15-16
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    • 2016
  • This paper proposes an isolated DCDC converter that consists of unregulated LLC resonant converter and non-isolated synchronous buck converter for battery charger of energy storage systems application. The unregulated converter operates as transformer with fixed duty ratio and switching frequency. The synchronous buck converter is installed in the output of the LLC resonant converter. And the converter charges and discharges the battery by controlling a current of battery. The proposed converter can get the high efficiency by separating function. This paper explains design of an unregulated converter and synchronous converter.

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A High Efficiency LLC Resonant Converter with Wide Operation Range using Adaptive Turn Ratio Transformer for a Li-ion Battery (변압기의 가변 턴비 기법을 통해 넓은 전압범위를 만족하는 리튬이온 배터리용 고효율 LLC 공진형 컨버터)

  • Han, Hyeong-Gu;Choi, Yeong-Jun;Kim, Rae-Young;Kim, Juyong;Cho, Jintae
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.4
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    • pp.305-311
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    • 2017
  • In this paper, the LLC resonant converter battery charger, using adaptive turn ratio scheme, is proposed to achieve high efficiency and wide range output voltage. The LLC converter high frequency transformer has an adaptively changed turn ratio by the auxiliary control circuitry. As a result, the optimal converter design with a large magnetizing inductance is easily achieved to minimize the conduction and the turn-off losses while providing widely regulated voltage gain capability to properly charge the Li-ion battery. The proposed converter operational principle and the optimal design considerations are illustrated in detail. Finally, several simulation results verify the proposed LLC resonant converter's effectiveness.

Development of Medical Ruby Laser Power Supply using LLC Resonant Converter (LLC 공진형 컨버터를 적용한 의료용 루비 레이저 전원장치 개발)

  • Kim, Dong-Hyun;Jung, Jae-Hun;Kim, Hee-Je
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.7
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    • pp.924-928
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    • 2014
  • LLC resonant converter is used to control laser power density in ruby laser power supply. Zero voltage switching(ZVS) is implemented to minimize the switching loss by the LLC resonant converter. Laser output power is investigated and experimented by changing the output current. That current is controled by the charging voltage of capacitor. From those results, we obtained the maximum laser output of 1.94J at the discharge current of 860A and the pulse repetition rate of 1Hz.

The efficiency Characteristics of LLC Half-Bridge Resonant Converter for Universal Lighting control system (조명 제어용 170W급 LLC 공진형 하프브리지 컨버터의 효율 특성)

  • LIM, Seongjin;KIM, Sungwan;KIM, Changsun;You, Jinho;Cheon, Seunghwan
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.23-24
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    • 2011
  • In this paper, the 170W LLC half bridge DC-DC converter is designed for the lighting management system. The power conversion circuit consists of PFC and isolated LLC resonant converter. The topology of LLC half bridge resonant converter provides ZVS characteristic. And the stresses of voltage and current is smaller than that of the general resonant converters. So we can expect the higher efficiency. The optimal conditions for high efficiency were investigated through by experiment.

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LLC Resonant Converter Using A Novel Planar Transformer (새로운 형상의 평면변압기를 이용한 LLC 공진컨버터)

  • Lee, Seung-Min;Noh, Young-Jae;Kang, Cheol-Ha;Jang, Sang-Ho;Kim, Eun-Soo;Chung, Bong-Gun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.6
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    • pp.627-637
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    • 2011
  • To cope with the high power density and low cost in switching power supply, this paper presents a novel planar transformer, which can regulate the leakage inductance of planar transformer used for LLC resonant converter. Modeling and analysis of a novel planar transformer are discussed in detail and a prototype 200W LLC resonant converter is tested to verify.

A High Efficiency LLC Series Resonant Converter (고효율 LLC 직렬공진 컨버터)

  • Kang, Sung-In;Yoon, Kwang-Ho;Kim, Eun-Soo;Park, Jun-Ho;Lim, Dae-Ho
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.424-427
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    • 2007
  • The LLC series resonant converter with a LLT (Inductor-Inductor-Transformer) transformer for PDP power supply is presented. LLT transformer used to combine the inductor and transformer into one unit has the increased leakage inductance in the primary and secondary due to the winding method and the use of the gaped core. The increased leakage inductance in the primary and secondary of LLT transformer can be impacted on the DC voltage gain characteristics of LLC series resonant converter. In this paper, DC gain characteristics and the experimental results of the LLC series resonant converter with a LLT transformer are verified on the Math-CAD simulation based on the theoretical analysis and the 600W experimental prototype.

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A Feedforward Compensation Method for 120Hz Output Voltage Ripple Reduction of LLC Resonant Converter (LLC 공진 컨버터의 120Hz 출력전압 리플 저감을 위한 전향보상 방법)

  • Yoon, Jong-Tae;Lee, Kui-Jun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.1
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    • pp.46-52
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    • 2021
  • This study proposes a feedforward compensation control method to reduce 120 Hz output voltage ripple in a single-phase AC/DC rectifier system composed of PFC and LLC resonant converters. The proposed method compensates for the voltage ripple of the DC-link by using the AC input and DC output power difference, and then reduces the final output voltage ripple component of 120 Hz through feedforward compensation based on the linearized frequency gain curve of the LLC resonant converter. Through simulation and experimental results, the validity of the ripple reduction performance was verified by comparing the conventional PI controller and the proposed feedforward compensation method.

Design and Implementation of 500 kHz High Frequency LLC Resonant Converter for High Power Density (높은 전력밀도를 갖는 500 kHz 고주파 LLC 컨버터의 설계와 구현)

  • Park, Hwa-Pyeong;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.1
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    • pp.51-58
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    • 2015
  • In order to decrease the size of a switch mode power supply, high switching frequency can be an efficient way to reduce the size of passive components in the converter. In this paper, a 500-kHz high-frequency LLC resonant converter is proposed with an accurate design method of magnetizing inductance, as well as the relationship between the switching frequency and the size of the passive components. Simulation and experimental results are presented to verify the proposed methods and equations, including the temperature data of each passive and active device of the converter. Using those results, dominant power losses in the prototype converter under 500-kHz high-frequency operation are investigated, compared with the results from a 100-kHz converter. In addition, operating waveforms and power conversion efficiency will be shown to obtain design considerations for the high switching frequency LLC resonant converter.

Design of the LLC Half Bridge Resonant Adapter for Notebook Computers (노트북 컴퓨터용 LLC 하프 브리지 공진형 어댑터 설계)

  • Hwang, Gook-Hwa;Youn, Dae-Young;Kim, Chang-Sun
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1039-1040
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    • 2006
  • The resonant converters cause the high voltage stress according to the input voltage, which increases the conduction loss in converter power switches. The topology of LLC half bridge resonant converter provides ZVS characteristic and also the stress of voltage and current is not higher than that of the general resonant converters. So we can expect the higher efficiency. In this paper, the LLC resonant converter is designed for the notebook computer adapter. In the adapter design, we should consider the weight, the size and 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 of the pre-regulator. It converts AC line input into about $400V_{DC}$ Link voltage of the LLC converter input and the converter has $16V_{DC}/90W$ ratings. The efficiency measured is about up to 92%.

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