Minimum resonant capacitor design of high‐power LLC resonant converter for comprehensive efficiency improvement in battery charging application

Zhao, Zhenxing; Xu, Qianming; Dai, Yuxing; Luo, An

doi:10.1049/iet-pel.2017.0649

Cited by 24 publications

(17 citation statements)

References 22 publications

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“…Moreover, since the LLC resonant converters can perform soft switching, they can achieve high efficiency. Therefore, power supply systems based on the LLC resonant converter are widely used in LCD TV power supplies [34][35] .…”

Section: Llc Resonant Converter In Lcd Tvmentioning

confidence: 99%

LLC resonant converter topologies and industrial applications — A review

Zeng

Zhang

et al. 2020

Chin. J. Electr. Eng.

119

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Owing to the advantages of high efficiency, high energy density, electrical isolation, low electromagnetic interference (EMI) and harmonic pollution, magnetic integration, wide output ranges, low voltage stress, and high operation frequency, the LLC resonant converters are widely used in various sectors of the electronics-based industries. The history and development of the LLC resonant converters are presented, their advantages are analyzed, three of the most popular LLC resonant converter topologies with detailed assessments of their strengths and drawbacks are elaborated. Furthermore, an important piece of research on the industrial applications of the LLC resonant converters is conducted, mainly including electric vehicle (EV) charging, photovoltaic systems, and light emitting diode (LED) lighting drivers and liquid crystal display (LCD) TV power supplies. Finally, the future evolution of the LLC resonant converter technology is discussed.

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Section: Llc Resonant Converter In Lcd Tvmentioning

confidence: 99%

LLC resonant converter topologies and industrial applications — A review

Zeng

Zhang

et al. 2020

Chin. J. Electr. Eng.

119

View full text Add to dashboard Cite

show abstract

“…The conventional FHA method is adopted in [14][15][16]. The design result is accurate and effective when the operating frequency is near the resonant frequency.…”

Section: Ac/dc (Pfc)mentioning

confidence: 99%

Design Method of 6-Element Boundary Gain for LLC Resonant Converter of Electric Vehicle

et al. 2020

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In the application of on-board chargers, LLC resonant converters need to work in multiple operating modes to achieve wide-range output requirements. For the most commonly used single-phase and three-phase LLC topologies, the time domain expressions of all possible operating modes are introduced to predict voltage and current behaviors. Based on the mode analysis, the 6-element boundary gain design method is proposed to design a wide gain range LLC resonant converter. The resonant current is used as the basis for ZVS judgment and the transformation trend of ZVS in the full operating range is given. Through reasonable distribution of the boost region and the buck region, the resonant devices can be designed more appropriately to achieve lower conduction loss and higher efficiency. Finally, the prototypes of 3.3kW and 6.6 kW are built to verify the theoretical analysis of the method in single-phase LLC and three-phase LLC. INDEX TERMS LLC resonant converter, Zero-voltage switching, wide range output, battery charger, electric vehicle.

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“…Battery charging technology based on DC-DC topologies has drawn attention in recent years due to its high equalization accuracy and high efficiency [13]- [18]. Mostly, control schemes for high-frequency DC-DC converters can regulate phase shift or operating frequency to adjust charging current/voltage at various load resistance [13], [14], and [16]- [24]. Among proposed topologies, phase-shifted full bridge (PSFB) converters have been investigated in many aspects due to their simple structures and ZVS features.…”

Section: Introductionmentioning

confidence: 99%

Resonant Converter for Battery Charging Applications With CC/CV Output Profiles

2020

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In this paper, a novel resonant circuit topology is proposed for battery charging applications. Compared with traditional implemented circuits, the proposed topology can provide constant current (CC) and constant voltage (CV) charging profiles for different battery states automatically. Specially, zero-voltageswitching (ZVS) turned on of switching devices can be realized at fixed operating frequency for different charging levels, which benefits the transferring efficiency and reduces the voltage stress of the switches. In addition, simple design methodology can be derived to improve system's practicality and reliability, avoiding complex control strategy. Experimental results obtained from a 200 W prototype system show good agreement with calculated results, validating that the proposed topology can be used for battery charging systems. INDEX TERMS Resonant converter, constant voltage, constant current, battery charging.

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Minimum resonant capacitor design of high‐power LLC resonant converter for comprehensive efficiency improvement in battery charging application

Cited by 24 publications

References 22 publications

LLC resonant converter topologies and industrial applications — A review

LLC resonant converter topologies and industrial applications — A review

Design Method of 6-Element Boundary Gain for LLC Resonant Converter of Electric Vehicle

Resonant Converter for Battery Charging Applications With CC/CV Output Profiles

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