A review on LLC Resonant Converter

Bhuvaneswari, C.; Babu, R. Samuel Rajesh

doi:10.1109/iccpeic.2016.7557268

Cited by 37 publications

(10 citation statements)

References 7 publications

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“…The LLC resonant converter has been widely used in the electric vehicle charger, server power supply, and uninterrupted power supply conditions for its advantages, such as isolation, adjustable voltage, soft switching, high switching frequency, and high efficiency [1,2]. In the ideal case, the resonant inductance, resonant capacitance, and magnetizing inductance operate together to achieve energy transfer.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Parasitic Components on LLC Resonant Converter

Hao

Lei

et al. 2019

Energies

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In recent years, the LLC resonant converter has been widely used in DC–DC conversion applications. However, the parasitic components of the LLC resonant converter have a significant impact in practical applications, such as influence on the conduction loss and the soft-switching of power devices, the voltage oscillation across rectifier diodes, the unregulated output voltage at light load condition and so on. It is hard to analyze the higher-order circuits by the conventional analysis methods. Focusing on the operational principle of the LLC converter with parasitic components, the differential equation model is presented and solved by the numerical method in this paper. The simulation results verify the correctness of the theoretical analysis. The causes of two different frequency oscillations and the voltage spike are clarified. The design considerations and a specific example of the LLC converter are given. The experimental results are consistent with the simulation results, and the soft-switching of primary-side switches can be achieved in the prototype.

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Section: Introductionmentioning

confidence: 99%

The Influence of Parasitic Components on LLC Resonant Converter

Hao

Lei

et al. 2019

Energies

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“…The output voltage of a PRC can be controlled from full load to no load by operating at a frequency above resonance. Furthermore, it is excellent for use in short circuits to the point that even when the load falls, the conduction losses remain constant in the semiconductor devices; the efficiency is also high for light loads (Bhuvaneswari and Babu, 2016). Because of the low switching losses of this converter, it is ideal for use in highfrequency, high-power systems.…”

Section: Two-element Resonant Power Converters Topologiesmentioning

confidence: 99%

“…The primary and secondary side rectifiers of an LLC can achieve ZVS and ZCS, respectively; they can also achieve minimal voltage stress on the secondary rectifier because this converter does not need to use secondary filter inductor voltage stress.Hence, there is a possibility of reducing the voltage stress on the diodes of the rectifier by twofold compared to the output voltage. This converter can also achieve ZVS + ZCS features with high efficiency in both forward and backward modes (Bhuvaneswari and Babu, 2016;Cao et al, 2019). ZVS and ZCS can also be realized over the full operational range.…”

Section: Llc Resonant Convertermentioning

confidence: 99%

“…The series resonant frequency frs assists in operation, but the parallel resonant frequency frp dominates LCC. Subsequently, LCC has the same limitations as the PRC (Bhuvaneswari and Babu, 2016). It is important to carefully select the ratio between the two resonant capacitors (AC) in LCC converters to ensure that it suits the required peak gain.…”

Section: Lcc Resonant Convertermentioning

confidence: 99%

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Resonant Power Converters for Renewable Energy Applications: A Comprehensive Review

et al. 2022

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Studies on resonant power converters (RPCs) have received much attention due to the rapid growth of their potential in modern power and renewable energy applications such as photovoltaic, electric vehicles, wind, and fuel cells. Consequently, a significant number of studies focusing on RPC topologies for renewable energy applications is available. Generally, these studies have addressed several aspects, such as the development of their soft switching feature, smooth waveforms, high power density, and high efficiency. With this in mind, the present paper aims to review the development of the RPCs, challenges in their development, and comparison between common topologies as highlighted in literature. In addition, the use of RPCs in various applications of renewable energy is highlighted, focusing on some of the recently utilized topologies based on their constructions and achievements. There are still several issues and challenges in research that need to be considered for future improvement of the RPC performance in renewable energy applications. The improvement may require modifications on the circuit design or control strategies.

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“…Resonant converters can be classified according to the LC network arrangement [3]. A series resonant converter contains a resonant element, inductor and capacitor connected in series to the load.…”

Section: Introductionmentioning

confidence: 99%

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

et al. 2021

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Soft switching for both primary and secondary side devices is available by using LLC converters. This resonant converter is an ideal candidate for today’s high frequency, high efficiency, and high power density applications like adapters, Uninterrupted Power Supplies (UPS), Solid State Transformers (SST), electric vehicle battery chargers, renewable energy systems, servers, and telecom systems. Using Gallium-Nitride (GaN)-based power switches in this converter merits more and more switching frequency, power density, and efficiency. Therefore, the present paper focused on GaN-based LLC resonant converters. The converter structure, operation regions, design steps, and drive system are described precisely. Then its losses are discussed, and the magnets and inductance characteristics are investigated. After that, various interleaved topologies, as a solution to improve power density and decrease current ripples, have been discussed. Also, some challenges and concerns related to GaN-based LLC converters have been reviewed. Commercially available power transistors based on various technologies, i.e., GaN HEMT, Silicon (Si) MOSFET, and Silicon Carbide (SiC) have been compared. Finally, the LLC resonant converter has been simulated by taking advantage of LTspice and GaN HEMT merits, as compared with Si MOSFETs.

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A review on LLC Resonant Converter

Cited by 37 publications

References 7 publications

The Influence of Parasitic Components on LLC Resonant Converter

The Influence of Parasitic Components on LLC Resonant Converter

Resonant Power Converters for Renewable Energy Applications: A Comprehensive Review

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

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