Common Capacitor Multiphase LLC Converter With Passive Current Sharing Ability

Wang, Hongliang; Yang, Chen; Qiu, Yue; Peng, Fang Zheng; Zhang, Yan; Wang, Laili; Liu, Yanfei; Afsharian, Jahangir; Yang, Zhihua

doi:10.1109/tpel.2017.2661066

Cited by 66 publications

(23 citation statements)

References 33 publications

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“…Establish the model of the LLCC circuit by the first‐order harmonic approximation (FHA) method [31, 32]. The resulting FHA equivalent circuit is shown in Fig.…”

Section: Analysis Of Topology Characteristicsmentioning

confidence: 99%

Soft‐switching DC–DC converter with controllable resonant tank featuring high efficiency and wide voltage gain range

Wang

Liu

Han

et al. 2020

IET Power Electronics

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A two-mode resonant DC-DC converter with auxiliary switch (named as sLLC-C) has been presented. Two simple structural circuits (namely LLC and LLCC) are integrated into one topology with only two magnetic cores, through the topological transformation method. The proposed converter successfully inherits the advantages of the above two circuits, while avoiding their drawbacks as well. At the rating condition, it functions as an LLC circuit, and thus high conversion efficiency is easily obtained. The LLCC working mode is called automatically once the input voltage increases. In such a way, within a limited frequency range, the voltage gain range is effectively extended. A detailed parameter design is given to help achieve desirable performances. Finally, experiments are carried out to validate the feasibility and correctness of the proposed sLLC-C converter. The output voltage is maintained at 400 V, even if the input voltage varies in the range of 150-400 V. Besides, the preferable soft-switching characteristics are ensured for both the power switches and secondary-side diodes. The maximum efficiency of 97.3% is achieved. Thus, wide voltage gain range and high conversion efficiency are acquired simultaneously. These performances make the proposed converter well appropriate for the fuel cell generation applications.

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“…Establish the model of the LLCC circuit by the first‐order harmonic approximation (FHA) method [31, 32]. The resulting FHA equivalent circuit is shown in Fig.…”

Section: Analysis Of Topology Characteristicsmentioning

confidence: 99%

Soft‐switching DC–DC converter with controllable resonant tank featuring high efficiency and wide voltage gain range

Wang

Liu

Han

et al. 2020

IET Power Electronics

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“…At light load, although phase shedding will be used in practice, the current sharing performance maintain as high. Common capacitor LLC converter has also been verified to achieve good current sharing performance [19], [20]. In addition to LLC converter, the passive impedance matching methods can also be applied to other resonant converters.…”

Section: Current Sharing With Passive Impedance Matchingmentioning

confidence: 99%

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Chen¹,

Liu²

2017

CPSS TPEA

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Abstract-LLC converter has been the simplest topology since long to achieve soft switching and overall the highest performance within small form factor at converter level. This paper discusses the latest advances of LLC converter from the perspective of topology and control. The technology ranges from high current, fast dynamic response to wide operational voltage range. The application mainly falls in the scope of server and data center, and may also cover telecom, PV, battery charging, etc.Index Terms-LLC, review, survey, current sharing, multiphase, interleave, phase shedding, passive impedance match, SR drive, fast dynamic, current mode control, current sensing, wide voltage range, hold up, high voltage gain.

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“…The multi-phase LLC resonant converters presented in [10]- [13], on the other hand, achieve a passive current balancing without additional feedback control loops nor current sensors, but there are still challenges to be addressed. Topology reported in [10] cannot achieve adequate current balancing if the transformers' parameters are mismatched. The interleaved LLC resonant converter employing common inductors tends to suffer from a current imbalance under light load conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Interleaved LLC Asymmetric Resonant Converter With Capacitive Current Balancing and Reduced Switch Voltage Stress

2020

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Interleaved converters are a typical solution to enhance a current capacity and to reduce current ripples of an input or output port. Conventional interleaved LLC resonant converters need additional switches and passive components with a feedback control loop for active current balancing, increasing the circuit complexity and cost. This paper proposes a novel three-phase interleaved LLC resonant converter with an automatic capacitive current balancing capability. Two flying capacitors are added to a conventional interleaved LLC resonant converter in order to realize not only the automatic capacitive current balancing but also the reduced switch voltage stresses and asymmetric resonant operations that contribute to reducing rms currents as well as copper losses of transformers. The detailed operation analysis, including the capacitive current balancing mechanism and gain characteristics derivation, are performed. The experimental verification using a 1-kW prototype demonstrated that the automatic capacitive current balancing could be achieved despite the significant mismatch in transformers' parameters.INDEX TERMS Asymmetric resonance, current balancing, flying capacitor, interleaved converter, LLC resonant converter.

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Common Capacitor Multiphase LLC Converter With Passive Current Sharing Ability

Cited by 66 publications

References 33 publications

Soft‐switching DC–DC converter with controllable resonant tank featuring high efficiency and wide voltage gain range

Soft‐switching DC–DC converter with controllable resonant tank featuring high efficiency and wide voltage gain range

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Three-Phase Interleaved LLC Asymmetric Resonant Converter With Capacitive Current Balancing and Reduced Switch Voltage Stress

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