3.3kW CLLC converter with synchronous rectification for plug-in electric vehicles

Zou, Shenli; Lu, Jiangheng; Mallik, Ayan; Khaligh, Alireza

doi:10.1109/ias.2017.8101708

Cited by 29 publications

(9 citation statements)

References 10 publications

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“…2) CLLC resonant converter CLLC resonant converter adds two capacitors on each side of the transformer compared to the DAB converter, which is shown in Fig. 5 (c) [120]- [122]. Compared to the DAB converter, the CLLC converter is controlled by a variable switching frequency and works with a much wider softswitching region, especially at light load conditions.…”

Section: ) Phase-shifted Dabmentioning

confidence: 99%

A Review of Bidirectional On-Board Chargers for Electric Vehicles

et al. 2021

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The fast development of electric vehicles (EVs) provides significant opportunities to further utilize clean energies in the automotive. On-board chargers (OBCs) are widely used in EVs because of their simple installation and low cost. Limited space in the vehicle and short charging time require an OBC to be power-dense and highly efficient. Moreover, the possibility for EVs to deliver power back to the grid has increased the interest in bidirectional power flow solutions in the automotive market. This paper presents a comprehensive overview and investigation on the state-of-the-art solutions of bidirectional OBCs. It reviews the current status, including architectures and configurations, smart operation modes, industry standards, major components, and commercially available products. A detailed overview of the promising topologies for bidirectional OBCs, including two-stage and single-stage structures, is provided. Future trends and challenges for topologies, wide bandgap technologies, thermal management, system integration, and wireless charging systems are also discussed in this paper.

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Section: ) Phase-shifted Dabmentioning

confidence: 99%

A Review of Bidirectional On-Board Chargers for Electric Vehicles

et al. 2021

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“…However, they did not provide detailed analysis of the topologies. The bidirectional flow of energy that can power load and provide power feedback to the power grid can be realized using bidirectional topologies, so the CLLC topologies, that is, bidirectional LLC topologies, are drawing increasing attention from the world …”

Section: Introductionmentioning

confidence: 99%

Analysis and design of asymmetric CLLC resonant DC‐DC converter

Sun

Wang

et al. 2020

Int Trans Electr Energ Syst

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Summary With the global climate deterioration and the increase of energy demands, distributed generation was used to converse the clean energy to electricity. Direct current–direct current (DC‐DC) converter has been widely applied in many fields such as uninterruptible power supply (UPS) DC power distribution system, electric vehicles, and small photovoltaic power generation. Most of the CLLC resonant converters are of symmetric structures. However, asymmetric CLLC resonant converters are drawing more and more attention for higher voltage gain. But the operation characteristics of asymmetric CLLC resonant converters are more difficult to analyze, and the calculating method of the key parameters is also too complex. This paper analyzes the structure composition, operation principle, DC voltage gain, and frequency characteristics of the topology and then presents a method of parameter design to solve the key problem encountered in the asymmetric structure resonant converter design. By adopting the method of parameter design, it could be ensured that the converter has similar operation characteristics and a high transmission efficiency in both directions. Moreover, an asymmetric CLLC resonant DC‐DC converter that connects 300‐to‐300‐V DC and with a power rating of 1 kW is designed and built up to verify validity and correctness of this parameter design method.

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“…It is especially preferable for high-frequency applications, where power density of the system can be greatly enhanced [16][17][18][19]. In addition, the symmetric structure of resonant components could achieve bidirectional power flow, which is known as grid-to-vehicle (G2V) and vehicle-to-grid [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, the switching timing of the secondary switches can be estimated using different approximation methods [22,[25][26][27]. First harmonic approximation (FHA) method has been a simple solution to model the converter, where only the first-order harmonic component of the voltage and the current is analysed [8,22]. The converter can be simplified to a resonant network with a sinusoidal voltage excitation.…”

Section: Introductionmentioning

confidence: 99%

Modelling and optimisation of a dual‐control MHz‐level CLLC converter with minimised power losses in battery charging applications

Zhang

Khaligh

2020

IET Power Electronics

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In this study, a novel ' f − φ' dual-control modulation is proposed for the MHz-level CLLC converters in battery charging applications. Phase shift between the primary and secondary switches is utilised as an additional control variable to effectively reduce the power losses, especially in light-and medium-load conditions. Compared to other state of the art, a more generalised theoretical model is developed to characterise the converter with higher accuracy based on extended harmonic approximation. Furthermore, a numerical algorithm is utilised to thoroughly examine the converter performance under various operating conditions and systematically search for the optimised design parameters under the proposed modulation scheme. The modelling and optimisation are verified by simulation on a 3.3 kW onboard charger design for electric vehicles, which shows an estimated efficiency enhancement between 1 and 4%. Finally, a laboratory prototype has been developed using gallium nitride semiconductor devices, at the resonant frequency of 1 MHz. The converter measured efficiencies are 96.4, 96.2 and 94% for the selected heavy, medium-and light-load conditions, respectively. This system would allow insights into the practical implementation and evaluation of utilising wide bandgap semiconductors to achieve both high power density and enhanced efficiency for emerging power electronic systems.

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3.3kW CLLC converter with synchronous rectification for plug-in electric vehicles

Cited by 29 publications

References 10 publications

A Review of Bidirectional On-Board Chargers for Electric Vehicles

A Review of Bidirectional On-Board Chargers for Electric Vehicles

Analysis and design of asymmetric CLLC resonant DC‐DC converter

Modelling and optimisation of a dual‐control MHz‐level CLLC converter with minimised power losses in battery charging applications

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