Current sharing in three-phase LLC interleaved resonant converter

Orietti, E.; Mattavelli, Paolo; Spiazzi, G.; Adragna, Claudio; Gattavari, G.

doi:10.1109/ecce.2009.5316510

Cited by 99 publications

(23 citation statements)

References 8 publications

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“…The three-phase LLCs have a 120° phase-shift between each phase. The load current sharing performance is good near resonant frequency, as all of threephase resonant current is zero [14] [15]. However, it can only be applied to three LLC modules in parallel.…”

Section: Introductionmentioning

confidence: 97%

A common capacitor multi-phase LLC resonant converter

Wang

Chen

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In this paper, a new common capacitor current sharing method is proposed for multi-phase LLC resonant converter. Automatic current sharing is achieved by using a common resonant capacitor for all the LLC resonant stages, by connecting the resonant capacitors in each phase in parallel. The proposed method can automatically share the load current without any additional circuits and control strategy. The current sharing performance of the proposed common capacitor current sharing method is analyzed under Fundamental Harmonic Analysis (FHA) assumption. A 600W two-phase LLC converter prototype based on the proposed method is built to verify the feasibility. Excellent current sharing performance (6.5% current sharing error at a wide load range) has been achieved.

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Section: Introductionmentioning

confidence: 97%

A common capacitor multi-phase LLC resonant converter

Wang

Chen

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…However, this method cannot be applied in applications where only one dc power source is available. The major drawback of the current-balancing methods based on multiphase resonant-converter approaches introduced in [5] and [6] is that they cannot implement phase shedding to maximize light-load conversion efficiency. The current sharing method in [7] employs additional switches to implement a variable resonant capacitor or inductor that can be controlled to compensate for mismatching of components and equalize the resonant frequencies of the interleaved modules.…”

Section: Introductionmentioning

confidence: 99%

A novel active-current-sharing method for interleaved resonant converters

Jang

Jovanovic

Ruiz

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper presents a novel active load-currentsharing control of paralleled or interleaved isolated seriesresonant converters. In the proposed control method, the output voltage is regulated by variable-frequency control of the converters' primary switches, while a delay-time control is used to control secondary-side switches provided in place of diode rectifiers to correct load-current imbalance between the converters that is caused by their mismatched components. By independently controlling the turn-off delay time of the secondary switches of each individual converter with respect to the zero-crossing instants of the corresponding resonant-tank current, excellent current balancing can be achieved. The evaluation of the proposed control method was performed on a 1.8-kW prototype that was implemented by two interleaved 900-W series-resonant LLC converters operating from a 240-450-V input-voltage range and providing a 13.8-V output.

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“…In [9][10], these methods rely on simulation to get the circulating current information. In [11], the secondary rectifier circuits are equivalent to two ac resistors for the two-phase LLC converter.…”

Section: Introductionmentioning

confidence: 99%

“…There are several literatures analyzing circulating current [9][10][11][12]. In [9][10], these methods rely on simulation to get the circulating current information.…”

Section: Introductionmentioning

confidence: 99%

An algorithm to analyze circulating current for multi-phase resonant converter

Wang

Chen

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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an algorithm based on new circulated current model is proposed to analyze the circulating current in the multiphase LLC converter. First of all, a virtual-open concept is introduced and LLC phases are decoupled from each other, Thus, A circulating current model can be achieved from fundamental harmonic approximation (FHA). Secondly, the ac voltages on the equivalent resistor of different phases are assumed same magnitude but different angle viewing from the primary-side. From mentioned above, current sharing error can be calculated, two types calculated results are shown under twophase independent LLC converter and two-phase common inductor LLC converter. Simulation results from different input voltage levels, different resonant component tolerances, and different total load are compared. A two-phase 600W prototype is built to verify the effectiveness of the proposed analysis method

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Current sharing in three-phase LLC interleaved resonant converter

Cited by 99 publications

References 8 publications

A common capacitor multi-phase LLC resonant converter

A common capacitor multi-phase LLC resonant converter

A novel active-current-sharing method for interleaved resonant converters

An algorithm to analyze circulating current for multi-phase resonant converter

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