A Novel Current Sharing Scheme for Two-phase Interleaved LLC Converter Based on Virtual Controllable Voltage Sources

Dong, Hanjing; Xie, Xiaogao; Xu, Sen; Yu, Haiming

doi:10.1109/tpel.2021.3107973

Cited by 19 publications

(4 citation statements)

References 15 publications

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“…The application of interleaved parallel technology can significantly solve the problem of high output current ripple of LLC resonant converter 16 , 17 . However, in the context of the LLC resonant converter, the parameters of its resonant elements wield considerable influence over its gain.…”

Section: Introductionmentioning

confidence: 99%

“…However, this method introduces an auxiliary converter, which is not favorable for reducing the cost and size of the overall converter. In 16 , a method of current sharing using virtual controllable voltage sources (VCVSs) is proposed. The specific principle is to use the auxiliary winding of the transformer to couple to the resonant slot of the other phase, and then adjust the phase between the two phases through the control strategy to achieve current sharing.…”

Section: Introductionmentioning

confidence: 99%

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A single-bridge interleaved three-level LLC resonant converter with current sharing capability for fuel cell system

Zhao,

Cheng,

et al. 2024

Sci Rep

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This paper propose a wide gain single-bridge interleaved three-level LLC resonant converter with current sharing capability. This novel converter offers numerous advantages, including low cost, low current ripple, reduced voltage and current stress, widely gain range, high efficiency, good current sharing capability and versatile application scalability. Utilizing the three-level inverter + full-wave rectifier LLC converter as a representative case, the paper conducts an in-depth analysis and research on the proposed method. Finality, a 600 W experimental prototype was constructed and tested. Experimental results reveal that the proposed converter exhibits lower current ripple and a broader gain range. Moreover, the converter shows good current sharing capability (with a resonant element tolerance of 10%, the current error between the two phases does not exceed 12%) and high efficiency (peaking at 95.8%).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A single-bridge interleaved three-level LLC resonant converter with current sharing capability for fuel cell system

Zhao,

Cheng,

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Tuneable inductors and switched capacitor solutions have been proposed in [5][6][7], these methods achieve current sharing by adjusting the gain of the resonant tank between modules. In [8], a current-sharing scheme based on virtual controllable voltage sources has been proposed, an auxiliary winding is added to each phase, which is inserted into the resonant tanks of the other phase, and the current balance is achieved by controlling the phase shift angle between phases. Besides, the method based on partial energy phase shift regulation is also an alternative [9].…”

Section: Introductionmentioning

confidence: 99%

Depth comparison of common inductor and common capacitor passive current sharing methods for multiphase LLC converter

Sun,

Wu,

Wang

et al. 2023

IET Power Electronics

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Common inductor (CIM) and common capacitor (CCM) passive current‐sharing methods have the advantages of simple implementation and low cost. However, there is still a lack of detailed comparative research on the two methods, which makes researchers confused when choosing the two methods. To provide clear scheme guidance, this paper provides a detailed comparison of the performance of the two methods. Firstly, this paper reveals the difference between the current waveforms of the two methods, that is, the current waveform of the CIM method is distorted, while the CCM method is non‐distorted. Then, the mechanism of the above phenomenon is analysed in depth. Secondly, for comparing the current sharing performance of the two methods, the first harmonic approximation (FHA) equivalent circuit model considering parasitic parameters is established to obtain the system's current sharing error model, and the parameter sensitivity analysis is provided. Finally, the relationship between the current waveform, current sharing error, and load ripple of the two methods is discussed. Then, based on the two methods, a more attractive common resonate tanks (CRT) current‐sharing method is proposed. The correctness of the view in this paper has been verified by extensive simulations and experiment results.

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“…To improve the current balancing performance of the three-phase LLC converter further, passive current-sharing methods are proposed in [27,28]. In [29][30][31], current-sharing methods for a multi-phase LLC converter are presented by using a coupled transformer or integrated magnetics. However, when the tolerances of the resonant components are significant in the above literature, it will still lead to unequal currents among the phases, and uneven temperature distribution, thereby causing a large output voltage ripple.…”

Section: Introductionmentioning

confidence: 99%

A reduced‐switch‐count two‐phase interleaved switch‐control‐capacitor LLC converter with accurate current balancing

Zhou

Feng

et al. 2023

IET Power Electronics

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In this paper, a reduced‐switch‐count two‐phase interleaved LLC converter with precise current balancing is proposed by using switching‐control‐capacitor (SCC) technology. Compared with the conventional SCC‐LLC converter, the proposed two‐phase SCC‐LLC converter reduces the switch count with the SCC circuits, and achieves excellent current sharing under all the tolerance conditions between the two‐phase resonant elements. In the proposed converter, the SCC circuit is only used in the first phase. The design of the SCC circuit parameters is analyzed to reduce the voltage stress of the SCC circuit and to ensure that two‐phase currents are balancing with large tolerance of resonant elements. A 2.16‐kW GaN‐based two‐phase interleaved SCC‐LLC converter prototype is established for data center application, and the experimental results show that the 98.1% peak efficiency, the 97.6% full load efficiency, and higher than 96% efficiency at the wide range from 3‐A to 40‐A load current are achieved. The precise current sharing lower than 1% is achieved by using a cheap ceramic capacitor with high tolerance, which validates the performance of the converter.

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A Novel Current Sharing Scheme for Two-phase Interleaved LLC Converter Based on Virtual Controllable Voltage Sources

Cited by 19 publications

References 15 publications

A single-bridge interleaved three-level LLC resonant converter with current sharing capability for fuel cell system

A single-bridge interleaved three-level LLC resonant converter with current sharing capability for fuel cell system

Depth comparison of common inductor and common capacitor passive current sharing methods for multiphase LLC converter

A reduced‐switch‐count two‐phase interleaved switch‐control‐capacitor LLC converter with accurate current balancing

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