A Novel Topology of Secondary LLC Series Resonant Converter

Kim, Eun-Soo; Chung, Bong-Geon; Kang, Sung-In; Cha, In-Su; Kye, Moon-Ho

doi:10.1109/apex.2007.357735

Cited by 7 publications

(4 citation statements)

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“…In [ 80 ] , two voltage step-up topologies based on LLC resonant converters are presented, offering limited voltage gains. However, one of these topologies does not utilize transformer magnetizing and leakage inductances, making it suboptimal with regards to volume and cost.…”

Section: ) Voltage Step-up Llc Resonant Converter Configurationmentioning

confidence: 99%

Application-Oriented Review of the LLC-Based Resonant Converters

Shahsevani,

Beiranvand

2024

IEEE Access

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The LLC resonant converter is a widely utilized power electronics converter, due to its numerous industrial and domestic applications. This converter offers some advantages such as soft-switching operation of all switches, high efficiency, high power density, low voltage stress, minimal electromagnetic interference (EMI) noise, input/output isolation, wide input/output voltage range, and reliable and good performance under the wide load variation ranges, as well as good light-load operation. However, this converter has certain limitations, which can be addressed to enhance its operation and efficiency. This paper provides an in-depth review and comparison of various LLC-based resonant converter configurations, focusing on their operational principles, mathematical analysis, control methods, and some practical applications including electric vehicle chargers, TV power supplies, LED drivers, photovoltaic cells, HVDC production, fuel cells, and wireless power transfer applications. By examining the strengths and weaknesses of the different LLC resonant converter designs, this study aims to contribute to the ongoing research efforts in improving the performance and efficiency of this important power electronics converter. INDEX TERMS DC-DC power conversion, LLC resonant converter, resonant power conversion.

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Section: ) Voltage Step-up Llc Resonant Converter Configurationmentioning

confidence: 99%

Application-Oriented Review of the LLC-Based Resonant Converters

Shahsevani,

Beiranvand

2024

IEEE Access

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“…As described above, if the LLC resonant converter is designed under the condition of f S = f 0 or f S < f 0 , the efficiency under full and heavy load conditions is excellent, but it is not suitable for lithium-ion battery chargers because the efficiency under light load conditions rapidly decreases [10]. In a rapid charger for battery charging, operating f S under the condition f S > f 0 is desirable, as it yields excellent efficiency in the entire load range and greatly reduces the circulating current of the resonant circuit [22].…”

Section: Analysis Of Resonance Characteristics Of Llc Resonant Convertermentioning

confidence: 99%

“…As described above, if the LLC resonant converter is designed under the condition of = or < , the efficiency under full and heavy load conditions is excellent, but it is not suitable for lithium-ion ba ery chargers because the efficiency under light load conditions rapidly decreases [10].…”

Section: Analysis Of Resonance Characteristics Of Llc Resonant Convertermentioning

confidence: 99%

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Resonance Characteristics of the LLC Resonant Half-Bridge Converter for the Rapid Charging of Personal Mobility Device Smart Batteries

Bae

2023

Energies

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This study discusses the resonance characteristics of the LLC resonant half-bridge converter and smart battery charging for the fast charging of personal mobility devices (e.g., electric kickboards, segways, hoverboards, electric bicycles, and electric motorcycles), whose use is rapidly increasing. Through the analysis of resonance characteristics, this study aims to validate that fS > f0 is the most appropriate correlation in the relationship between resonant frequency (f0) and switching frequency (fS) that is suitable for the rapid charging of batteries of personal mobility devices. Additionally, the proposed half-bridge converter does not charge the battery from discharge or misconnection based on the detection of the battery voltage for the batteries of personal mobility devices. Therefore, the proposed converter suggests a charging system based on battery state detection that stably performs rapid charging of the batteries of personal mobility devices by equalizing the battery voltage and the charger voltage through a pre-charge operation.

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