Analysis of LLC Resonant Converter considering effects of parasitic components

Lee, Byoung-Hee; Kim, Moon-Young; Kim, Chong-Eun; Park, Ki-Bum; Moon, Gun-Woo

doi:10.1109/intlec.2009.5351740

Cited by 90 publications

(35 citation statements)

References 3 publications

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“…Using the analysis method proposed in [22], it is found that transformer wiring capacitance is the main factor leading to the upturn problem. As is shown in Figure 7a, the ideal gain curve without considering parasitic parameters in forward mode is monotonous with working frequency under light load conditions.…”

Section: Half-bridge Configuration At Light Load Conditionmentioning

confidence: 99%

Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

et al. 2018

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This study presents a new bidirectional multi-resonant DC-DC converter, which is named CLTC. The converter adds an auxiliary transformer and an extra resonant capacitor based on a LLC resonant DC-DC converter, achieving zero-voltage switching (ZVS) for the input inverting switches and zero-current switching (ZCS) for the output rectifiers in all load range. The converter also has a wide gain range in two directions. When the load is light, a half-bridge configuration is adopted instead of a full-bridge configuration to solve the problem of voltage regulation. By this method, the voltage gain becomes monotonous and controllable. Besides, the digital synchronous rectification strategy is proposed in forward mode without adding any auxiliary circuit. The conduction time of synchronous rectifiers equals the estimation value of body diodes' conduction time with the lightest load. Power loss analysis is also conducted in different situations. Finally, the theoretical analysis is validated by a 5 kW prototype.

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Section: Half-bridge Configuration At Light Load Conditionmentioning

confidence: 99%

Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

et al. 2018

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“…Ref. [16] demonstrates that the normalized dc gain equation of the converter is modified with the rectifier junction capacitances. The circuit resonates with the parasitic capacitances when switching frequency is too high.…”

Section: B Maximum Switching Frequency X Maxmentioning

confidence: 99%

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

Sun¹,

Wu²,

Hu³

et al. 2015

Journal of Power Electronics

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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 L m to the resonant inductor L r ) of the LLC converter in this paper is designed with two charging points, (V o_min , I o_max1 ) and (V o_max , I o_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%.

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“…앞선 논문들에 따르면 이상적인 LLC 컨버터의 경우, Fundamental Harmonic Approximation (FHA)을 이용 하여 LLC 컨버터의 공진 탱크를 해석할 수 있다 [9][10] . FHA에 따라 기본 주파수 성분만 출력 파워에 전달된다 고 할 때, 그림 2와 같은 공진 탱크를 구성할 수 있으 며, 이를 통하여 LLC 컨버터의 이득을 구하면 [10]- [11] .…”

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“…FHA에 따라 기본 주파수 성분만 출력 파워에 전달된다 고 할 때, 그림 2와 같은 공진 탱크를 구성할 수 있으 며, 이를 통하여 LLC 컨버터의 이득을 구하면 [10]- [11] . 앞서 언급한 경 부하 시의 레귤레이션이 안 되는 문 제점을 보완하기 위해서 PDP나 어댑터 등의 제품에서 는 극 경부 하 또는 무 부하 상태에서의 안정적인 동작 을 보장하기 위하여 더미 부하를 달아주어 일정 전력을 지속적으로 소모하는 방법을 사용한다 [10] . 이 방법의 경 우, 레귤레이션이 전 부하 영역에서 이루어지지만, 더미 부하를 통해 지속적인 손실이 발생하여 경 부하 시 효 율 감소의 주된 원인이 된다.…”

unclassified

“…이 방법의 경 우, 레귤레이션이 전 부하 영역에서 이루어지지만, 더미 부하를 통해 지속적인 손실이 발생하여 경 부하 시 효 율 감소의 주된 원인이 된다. 이 외에도 동작 주파수 제 한이나 정류단 구조 변경 등의 방법들이 있지만 [10] , 이들 은 출력 전압 레귤레이션을 위한 근본적인 해답이라고 할 수는 없다.…”

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Analysis for Light Load Regulation of LLC Converter using Bode Plot

Yeon¹,

Moon²

2016

The Transactions of the Korean Institute of Power Electronics

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In general, LLC converters show great promise in applications that require high efficiency, especially under light load conditions. In particular, LLC converters feature wide gain capability with pulse-frequency modulation and zero voltage switching over entire load conditions. However, output voltage increases in light load conditions. In this study, Bode plot and impedance asymptotes analyses were conducted to obtain insights into the regulation characteristics of LLC converters under light load conditions. To improve the regulation characteristic of LLC converters, a new resonant tank with an additional capacitor is proposed. The design guideline for the proposed LLC converter is determined by the Bode plot and impedance asymptotes analyses. Therefore, the proposed LLC converter achieves the light load regulation while maintaining the advantages of typical LLC converters.

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Analysis of LLC Resonant Converter considering effects of parasitic components

Cited by 90 publications

References 3 publications

Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

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

Analysis for Light Load Regulation of LLC Converter using Bode Plot

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