• Title/Summary/Keyword: LLC Resonant converter

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A Common Capacitor Connected LLC Resonant Converter with Auxiliary Switches Operating Over a Wide Output Voltage Control Range (넓은 출력전압 제어범위에서 동작하는 보조스위치 적용 공통커패시터 연결 LLC 공진컨버터)

  • Oh, Jae-Sung;Kim, Min-Ji;Lee, Ji-Cheol;Kim, Eun-Soo;Jeon, Yong-Seog;Kook, Yoon-Sang
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.4
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    • pp.294-302
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    • 2019
  • A capacitor common connected LLC resonant converter with auxiliary switches for a wide output voltage control range is presented in this paper. The proposed converter can be controlled in two ways to achieve a wide output voltage control range of Vo-3Vo. The first control method is performed through pulse width modulation of the auxiliary switches and primary switching devices. The second control method is conducted through frequency modulation of the primary switching devices configured to operate in full-bridge switching modes, when the auxiliary switches are turned off. The feasibility of the proposed converter is verified by the experimental results of a 5 kW prototype.

High Voltage Power Supply using an LLC Resonant Half bridge Converter (LLC 공진형 하프브릿지 컨버터를 이용한 고전압 전원장치)

  • Gil, Young-Man;Ga, Dong-Hoon;Ahn, Tae-Young;Choi, Eun-Sil;Lee, Jun-Hak;Lee, Hak-Soo
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.522-523
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    • 2012
  • In this paper, we present an experimental results of 15kV class high-volatge power supply using the LLC resonant half-bridge converter for CNT lamp. The resonant current of the LLC resonant half-bridge converter prototype in the steady state was stable. The output voltage of prototype converter was maintained at about 15kV in the steady state.

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A Study on the Synchronous Rectifier Driver Circuits in the LLC Resonant Half-Bridge Converter (LLC 공진형 하프브릿지 컨버터의 동기정류기 구동회로에 관한 연구)

  • Ahn, Tae-Young;Im, Bum-Sun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.30 no.1
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    • pp.79-86
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    • 2016
  • In this paper, we propose a current-driven synchronous rectifier driver circuit for LLC resonant half-bridge converters. The proposed driver circuit detects a relatively low current in the primary side of the transformer although a large current is flowing in the secondary side. Due to this feature, the driver circuit has a simple circuit structure and stabilizes the switching operation with a logic-level switching voltages for the synchronous rectifier. The operation and performance of the proposed driver circuit are confirmed with a prototype of 1kW class LLC resonant half-bridge converter. The experimental results proved that the proposed synchronous rectifier driver method improves the power conversion efficiency by around 1% and reduces the internal power loss by 17W.

Operating Characteristics of LLC Series Resonant Converter Using A LLT Transformer (LLT 변압기 적용 LLC 직렬공진컨버터 동작특성)

  • Lee, Hyun-Kwan;Huh, Dong-Young;Lee, Gi-Sik;Chung, Bong-Geun;Kang, Sung-In;Kim, Eun-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.5
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    • pp.409-416
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    • 2006
  • Operating Characteristics of LLC Series resonant converter with a LLT(Inductor-Inductor-Transformer) transformer 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 winging 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 the paper, DC gain characteristics and the experimental results of the LLC series resonant converter with a LLT transformer are verified on the simulation based on the theoretical analysis and the 400W experimental prototype.

LLC Half Bridge Resonant Converter for Slim type Adapter (슬림형 어댑터용 하프 브리지 공진형 컨버터)

  • Shin, Yong-Hee;Hwang, Gook-Hwa;Kim, Chang-Sun;Lee, Chul-Kyung;Youn, Dae-Young
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1108-1110
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    • 2007
  • 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 smaller than that of the general resonant converters. So we can expect the higher efficiency. In this paper, the LLC resonant converter is designed for slim adapter. In the adapter design, we should consider the weight, the size and overheat of the adapter. Thus the optimal design of transformer is the most important facts. Some parameters should be considered in order to get the highest efficiency. The LLC resonant converter input is 390VDC Link voltage of PFC and the output has 16VDC/90W ratings. The efficiency measured is about up to 93%.

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Grid-tied Power Converter for Battery Energy Storage Composed of 2-stage DC-DC Converter

  • Kim, Do-Hyun;Lee, Yoon-Seok;Han, Byung-Moon;Kim, Ju-Yong;Chae, Woo-Kyu
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1400-1408
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    • 2013
  • This paper proposes a new grid-tied power converter for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.

A New Dual Output LLC Resonant DC/DC Converter using Single Control IC (단일 제어 IC를 사용한 새로운 이중출력 LLC 공진형 DC/DC 컨버터)

  • Yoon, Jong-Kyu;Cho, Sang-Ho;Roh, Chung-Wook;Hong, Sung-Soo;Kim, Jong-Hae;Lee, Hyo-Bum;Han, Sang-Kyu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.6
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    • pp.453-460
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    • 2008
  • This paper proposes a new multi-output LLC resonant converter by using single control IC, which has the tight-regulated dual output voltage without additional power devices and controller. The proposed converter has master and slave outputs, of which regulations are achieved by the PWM(pulse width modulation) and PFM(pulse frequency modulation), respectively. Different from the conventional dual-output LLC resonant converter, the proposed converter has no additional post-regulators like a boost converter. Therefore, it features a low cost, small size, and high efficiency. To confirm the validity and prove the superiority of proposed converter, simulated and experimental results on a 50" FHD PDP power set prototype are presented.

A study on the efficiency characteristics for LLC resonant half-bridge converter with synchronous rectifier (동기정류기를 적용한 공진형 하프브릿지의 효율특성에 관한연구)

  • Lee, Gwang-Taek;Ahn, Tae-Young
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.289-291
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    • 2005
  • In this paper results of the experiment which used LLC resonant half bridge DC-DC converter to a portable electrical equipment. LLC resonance Half Bridge DC-DC converter which was used in this experiment improved an efficiency because it reduced switching, conduction losses and with synchronous rectifier. As a result of the experiment, this proposed converter could verified an increase of 2% to the efficiency more than diode rectifier.

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Resonant Tank Design Considerations and Implementation of a LLC Resonant Converter with a Wide Battery Voltage Range

  • Sun, Wenjin;Wu, Hongfei;Hu, Haibing;Xing, Yan
    • Journal of Power Electronics
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    • v.15 no.6
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    • pp.1446-1455
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    • 2015
  • This paper illustrates resonant tank design considerations and the implementation of a LLC resonant converter with a wide battery voltage range based on the fundamental harmonic approximation (FHA) analysis. Unlike the conventional design at zero load, the parameter K (the ratio of the transformer magnetizing inductor Lm to the resonant inductor Lr) of the LLC converter in this paper is designed with two charging points, (Vo_min, Io_max1) and (Vo_max, Io_max2), according to the battery charging strategy. A 2.9kW prototype with an output voltage range of 36V to 72V dc is built to verify the design. It achieves a peak efficiency of 96%.

Small Signal Modeling Analysis and Experimental Verification of LLC Resonant Converter (LLC 공진형 컨버터의 소신호 모델링 분석 및 실험적 검증)

  • Kim, Jinwoo;Lee, Taeyoung;Cho, Younghoon;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.365-366
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    • 2017
  • LLC resonant DC-DC converter is widely used in many kinds of applications such as battery energy storage systems, wireless power transfer and high voltage power supply. It is because of characteristics like high efficiency, power density, isolation, wide power level and stability enhancement at high switching frequency. Small signal modeling helps to design controller of the converter by approximating the behavior of nonlinear system with linear state equations. This paper presents comparison between small signal modeling analysis and experimental results of LLC resonant converter.

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