• 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.

• JSTS:Journal of Semiconductor Technology and Science
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• v.16 no.3
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• pp.330-338
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• 2016

Phase change memory (PCM) has been studied as an emerging memory technology for last-level cache (LLC) due to its extremely low leakage. However, it consumes high levels of energy in updating cells and its write endurance is limited. To relieve the write pressure of LLC, we propose a delta value indicator (DVI) by employing a small cache which stores the difference between the value currently stored and the value newly loaded. Since the write energy consumption of the small cache is less than the LLC, the energy consumption is reduced by access to the small cache instead of the LLC. In addition, the lifetime of the LLC is further extended because the number of write accesses to the LLC is decreased. To this end, a delta value indicator and controlling circuits are inserted into the LLC. The simulation results show a 26.8% saving of dynamic energy consumption and a 31.7% lifetime extension compared to a state-of-the-art scheme for PCM.

• The Transactions of the Korean Institute of Power Electronics
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• v.14 no.5
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• pp.397-405
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• 2009

Nowadays, power supplies for LCD TV of larger and slimmer screen size are required to have high power density and high efficient characteristics. In order to meet these requirements, Multi-phase interleaved LLC resonant converter is applied for increasing power density and reducing the current rating in the used devices. In this paper, gain characteristics and the experimental results of the proposed two-phase LLC resonant converter which implemented by the simple control circuit are verified based on the theoretical analysis and the 300W experimental prototype.

• The Transactions of the Korean Institute of Power Electronics
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• v.14 no.5
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• pp.406-414
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• 2009

To cope with the high power density and low cost in switching power supply, LLC resonant converters with the two resonant tank circuits composed of resonance capacitors and two transformers are proposed in this paper. Each transformers used for the proposed resonant circuits are parallel connected in the primary and series connected in the secondary to reduce the current unbalance. The proposed LLC resonant converters are described and verified on 300W experimental prototype.

• 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 V_DC buses is designed and tested to verify the validity and applicability of this proposed converter.

• 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.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.618-622
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• 1990

In this study LLC and MAC program, which is the base of the communication software, is implemented. This program is tested in the MAP board for IBM PC. The LLC is of class 3, which provides the services of type 1 and 3. The MAC uses the Token Passing Bus Access Method of IEEE 802.4 standard. The LLC is implemented in C language, and MAC in C language and 80186 assembly language. MAC program takes advantage of MC 68824 which is the token bus controller produced by Motorola.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.209-210
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• 2010

LLC 공진형 컨버터는 영전압 스위칭과 영전류 스위칭이 가능하여 높은 효율로 동작하고 안정적인 전원 공급이 가능하다. 본 논문은 LED 전원 공급 장치로 쓰이고 있는 플라이백 컨버터와 LLC 공진형 하프브리지 컨버터를 비교하여 LLC 공진형 컨버터의 우수성을 입증하고, 그 특성을 분석하였다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.98-100
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• 2019

현재 LLC 공진 컨버터는 넓은 주파수 범위에서 ZVS(zero voltage switching) 달성을 통하여 고효율 및 높은 전력 밀도를 얻을 수 있어 널리 사용되는 추세이다. 일반적인 LLC 공진 컨버터는 중부하에서 주파수 제어를 통해 이득을 조절할 수 있다. 하지만 경부하에서는 주파수 작동 범위에 제한으로 이득을 조절하지 못하는 문제점이 있다. 이에 본 논문은 Single-Stage LLC 공진 컨버터를 통해 경부하 조건에서 넓은 출력 범위를 가지는 것을 분석하였으며 시물레이션을 통해 확인하였다.

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.205-206
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• 2018

LLC 컨버터는 1차측 스위치의 ZVS, 2차측 다이오드의 ZCS를 만족하며 높은 Power density로 인해 여러 분야에서 각광 받고 있는 시기이다. 기존의 FHA를 통해 LLC 컨버터를 해석하여 전압이득을 구하고 이를 기반으로 설계를 하지만 실제로는 기본파 성분뿐만 아니라 고조파 성분을 포함하므로 다소 오차가 존재하게 된다. 따라서 이 논문에서는 기존의 FHA에서 반영하지 않았던 출력 캐패시터의 영향을 반영함으로써 보다 정확한 LLC 컨버터의 전압이득 곡선을 제안한다.