Low profile LLC series resonant converter with two transformers

Kim, Eun-Soo; Kim, Joo-Hoon; Kang, Sung-In; Park, Junho; Lee, Jae-Sam; Huh, Dong-Young; Jung, Yong-Chae

doi:10.1109/apec.2010.5433491

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…In this way, the conduction loss is less than the below resonance working condition. In the below resonance working condition, the converter can have greater efficiency for lower output voltage implementations, where SBR diodes can be currently used for the secondary-side diodes so that reverse recovery disadvantages are less important [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Application of 24V/20A LLC Resonant Converter for OLED TVs

Özçelik¹,

Obdan²

2018

Pamukkale J Eng Sci

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This study aims to come out with a double transformer resonant converter design that is serially connected in the primary part and parallel connected in the secondary part while using LLC topology. With the help of serial resonance characteristics, the power MOSFETs are conducted at zero voltage switching, therefore the switching power losses on the semiconductor devices are minimized. In the recommended converter, the primary part of two transformers are connected in series in order to transmit the load currents to output in a balanced manner. In the secondary part, the transformers are parallel connected in order to provide equal distribution of load currents. This, in return, decreased the current stresses on the secondary part of the transformers and on the output rectifying diodes. This study provides the working principle of the series resonant LLC converter topologies by designing the PSIM simulation model and laboratory prototype with 24V/20A output for OLED TV power source. Bu çalışmada, LLC topolojisi kullanılarak çift transformatör yapısı ile transformatörlerin primer tarafları seri sekonder tarafları paralel bağlı olacak şekilde rezonanslı dönüştürücü ele alınmıştır. Seri rezonans karakteristiği sayesinde güç Mosfet'leri sıfır gerilim altında iletime girmektedir, böylece yarı iletkenler üzerindeki kayıplar azalmıştır. Önerilen dönüştürücüde transformatörlerin primer sargıları birbirlerine seri bağlanmıştır, bu sayede çıkış tarafına akım dengeli bir şekilde sağlanmıştır. Sekonder tarafta transformatörlerin sargıları birbirlerine paralel bağlanmıştır böylece yük akımı eşit biçimde dağıtılmış aynı zamanda transformatörlerin sekonder sargılarının ve çıkış doğrultucu diyotlarının akım stresi azalmıştır. Bu çalışmada LLC rezonanslı dönüştürücünün çalışma prensibi ele alınmıştır ve OLED TV güç kaynakları için 24V/20A çıkışlı devrenin PSIM simülasyon modeli ve prototipi oluşturulmuştur.

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Section: Introductionmentioning

confidence: 99%

Application of 24V/20A LLC Resonant Converter for OLED TVs

Özçelik¹,

Obdan²

2018

Pamukkale J Eng Sci

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“…In [10], for decreasing the temperature of this transformer, a power module composed of two flat transformers is designed. In [11], to give high output power, a new LLC resonant converter with two transformers is presented. In this structure, to decrease imbalance in primary current, two transformers are applied to LLC converter with their primaries serially connected and secondaries parallelly connected to each other.…”

Section: Introductionmentioning

confidence: 99%

“…For medium power solid state lighting applications, a new topology along with the use of film technology capacitors which has a longer lifetime than standard electrolytics is presented for effective power factor correction to comply with the harmonic injection and energy saving standards [22]. Methods proposed in [7][8][9][10][11][12][18][19] are used to optimize the efficiency of power sources used in LCD TVs. By using LLC resonance converters, 89.43% efficiency for 40 inch LCD TV in [7], high efficiency (full loading 96.5%) and low cost for power sources used in 42 inch PDP TVs in [8] are achieved.…”

Section: Introductionmentioning

confidence: 99%

“…By using LLC resonance converters, 89.43% efficiency for 40 inch LCD TV in [7], high efficiency (full loading 96.5%) and low cost for power sources used in 42 inch PDP TVs in [8] are achieved. In [10,11] LLC resonant converters designed for PDP TV are presented, in [10] design of 14 mm transformer is done and total efficiency is calculated as 96.6 %. Serial converter with two transformers proposed in [11] is used in 50 inch PDP TV system.…”

Section: Introductionmentioning

confidence: 99%

“…In [10,11] LLC resonant converters designed for PDP TV are presented, in [10] design of 14 mm transformer is done and total efficiency is calculated as 96.6 %. Serial converter with two transformers proposed in [11] is used in 50 inch PDP TV system. In [12] half bridge resonant converter, with its LCD TV power source having 46/47 inch active PFC circuit and standby converter, is designed.…”

Section: Introductionmentioning

confidence: 99%

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Design and optimization of a power supply unit for low profile LCD/LED TVs

Vural

Demirel²,

Erkmen³

2017

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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The ongoing demand for smaller and lighter power supplies is driving the motivation to increase power density while maintaining a robust design compatible with international harmonic standards. Transformer design is a major challenge for low profile and high power density TV power cards. In addition to these, for electromagnetic interference standard and for providing efficient thermal management for heat emission, it is required to minimize EMI noise. In this study, by taking these stated criteria into consideration, a TV power card has been designed, which has 220W output power and can be used in low profile televisions. Proposed power card will meet desired critical parameters such as surface area and output power of the referenced card which has 13.5mm height, the heat, and power consumption at standby mode. Moreover, it is designed with 10mm height limit without any engraving on PCB in a way that it will meet International Electrotechnical Commission (IEC) current harmonic standard to which TVs are subjected. Experimental results demonstrate that the proposed power supply with 10mm height has 34% higher power density with respect to its counterpart having 13.5 mm height.

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