Interleaved LLC Converter With Cascaded Voltage-Doubler Rectifiers for Deeply Depleted PEV Battery Charging

Shahzad, M. Imran; Iqbal, Shahid; Taib, Soib

doi:10.1109/tte.2017.2753407

Cited by 54 publications

(30 citation statements)

References 30 publications

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“…However, the circulating current caused by the phase shift control leads to a decrease in efficiency (19) . In (5), a voltage doubling rectifier circuit structure was proposed for charging a deeply depleted Li-ion battery. This proposed method can achieve an output voltage from 100 to 420 V by PFM control.…”

Section: Advance Publicationmentioning

confidence: 99%

“…after the transition from mode 1 to mode 2 is represented by Eq. (5). Therefore, the switching frequency after performing the mode transition is f s = f r in all operating modes.…”

Section: Transition Between Operation Modesmentioning

confidence: 99%

“…1. In PHEV battery packs, the Li-ion cell voltage range is mapped to a wide voltage range, typically 100-420 V (3)- (5) . Consequently, the on-board battery charger must be compatible with this wide voltage range of the battery packs.…”

Section: Introductionmentioning

confidence: 99%

“…E-mail: hagah@vos.nagaoka ut.ac.jp * Nagaoka University of Technology 1603-1, Kamitomioka-machi, Nagaoka, Niigata 940-2188, Japan frequency modulation (PFM) of the primary switches. However, to be adapted to a wide output voltage range, the switching frequency (f s ) of the LLC converter must swing in a wide span and deviates from the resonant frequency (f r ) (5) (11) . Furthermore, when f s is higher than f r , the primary switches of the FB-LLC converter suffer from a high turn-off current.…”

Section: Introductionmentioning

confidence: 99%

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Wide-Range Voltage Gain and High-Efficiency of Isolated LLC Converter using Six-Switch and Two Asymmetric Transformers

Kinoshita

Haga

2020

IEEJ Journal IA

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This paper proposes a circuit configuration of LLC converter a wide voltage range and high efficiency. The proposed LLC overcomes the narrow voltage gain range of conventional full-bridge (FB) LLC converters. Owing to the switching patterns of the primary side, two resonant tanks operate in half-bridge and FB modes. The two resonant tanks are designed with different parameters, and the proposed LLC has six operating modes. These modes enable a squeezed switching frequency span, which is close to the resonance frequency. The proposed control method achieves seamless transition between the operating modes and a wide voltage gain range. First, the operating principles and characteristics of the proposed converter are analyzed. The transitions between modes are determined based on the analyzed theory. In addition, the design guidelines for the two resonant tanks are describe. The parameters of the two resonant tanks are designed using the first harmonic approximation method, and each is determined to achieve a wide voltage range and high efficiency. A prototype rated to 1.0-kW is designed to convert the input of 360 V to an output of 100-420 V, and the proof of concept is validated. Experimental results confirm that the proposed circuit achieves a voltage gain of less than 0.5 to more than 2.0 under different load conditions. Furthermore, the proposed mode transition method achieves seamless transition between modes without complicated calculations. Experiments confirm a maximum efficiency of 96.5%.

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Section: Advance Publicationmentioning

confidence: 99%

“…after the transition from mode 1 to mode 2 is represented by Eq. (5). Therefore, the switching frequency after performing the mode transition is f s = f r in all operating modes.…”

Section: Transition Between Operation Modesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wide-Range Voltage Gain and High-Efficiency of Isolated LLC Converter using Six-Switch and Two Asymmetric Transformers

Kinoshita

Haga

2020

IEEJ Journal IA

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“…Isolated converters use a transformer to achieve a high voltage gain, which increases the bulkiness of the system and leads to core-saturation problems. To achieve a wide output voltage, an interleaved LLC converter with voltage doublers is proposed in Reference [4]. A coupled-inductor-based bidirectional converter, as investigated in Reference [5], provides a high voltage gain and efficiency by employing soft switching and voltage clamping techniques to reduce Energies 2019, 12, 221 3 of 32 the switching loss and achieve a high voltage gain.…”

mentioning

confidence: 99%

Design and Analysis of Non-Isolated Three-Port SEPIC Converter for Integrating Renewable Energy Sources

et al. 2019

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An efficient way of synthesizing a three port non-isolated converter from a single-ended primary inductor converter (SEPIC) is proposed in this paper. The primary SEPIC converter is split into a source cell and a load cell. Two such source cells are integrated through direct current (DC) link capacitors with a common load cell to generate a three-port SEPIC converter. The derived converter features single-stage power conversion with reduced structural complexity and bidirectional power flow capability. For bidirectional power flow, it incorporates a battery along with an auxiliary photovoltaic source. Mathematical analyses were carried out to describe the operating principles and design considerations. Experiments were performed on an in-house-built prototype three-port unidirectional converter, and the results are presented to validate the feasibility of the designed converter.

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A high power‐factor lithium‐ion battery charger with series‐input parallel‐output dual bridgeless single‐stage resonant conversion circuit

Chang

Yan

et al. 2021

Int Trans Electr Energ Syst

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This study realizes a high power-factor lithium battery charger which integrates a bridgeless boost-type power-factor-correction converter and a full bridge LLC resonant circuit to constitute a single-stage topology. The developed lithium battery charger is featured with high power-factor, current and voltage stresses reduction on components by introducing a pair of converters using series-input and paralleloutput mechanism. The developed battery charger has the following advantages:(a) bridgeless structure reducing circuit losses; (b) resonant technique usage furnishing power switches with soft-switching; (c) constant current (CC) and constant voltage (CV) charging power regulation with frequency modulation scheme simplifying the trigger circuit complexity; (d) series-input and parallel-output dual converters topology sharing current, voltage stresses, and reducing the component rating; and (e) paired interleaved PFC (power-factor-correction) operation sharing current loading and thus increasing charging battery size. Finally, a prototype 2 kW battery charger with 220 V input voltage is implemented and realized. The experimental measurements reveal that the full load efficiency can reach 88% while the power factor exceeds 0.99. In the modulating charging power range, the maximum conversion efficiency can reach to 92%.

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Interleaved LLC Converter With Cascaded Voltage-Doubler Rectifiers for Deeply Depleted PEV Battery Charging

Cited by 54 publications

References 30 publications

Wide-Range Voltage Gain and High-Efficiency of Isolated LLC Converter using Six-Switch and Two Asymmetric Transformers

Wide-Range Voltage Gain and High-Efficiency of Isolated LLC Converter using Six-Switch and Two Asymmetric Transformers

Design and Analysis of Non-Isolated Three-Port SEPIC Converter for Integrating Renewable Energy Sources

A high power‐factor lithium‐ion battery charger with series‐input parallel‐output dual bridgeless single‐stage resonant conversion circuit

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