An Integrated Dual-Output Isolated Converter for Plug-in Electric Vehicles

Tang, Yichao; Lu, Jiangheng; Wu, Bin; Zou, Shenli; Ding, Weisheng; Khaligh, Alireza

doi:10.1109/tvt.2017.2750076

Cited by 81 publications

(28 citation statements)

References 23 publications

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“…However, the efficiency of H2L charging is compromised since the system is comprised of multiple stages, including one full bridge, one boost converter, one centre-tapped transformer and two additional switches. Moreover, a dual-output DC-DC converter is proposed in [7] to realise the OBC and APM integration using pulse-frequency modulation (PFM) [8]. The topology utilises an integrated transformer to provide the galvanic isolation and the integration of a CLLC resonant converter with an LLC resonant converter.…”

Section: Introductionmentioning

confidence: 99%

Modelling and control of a triple‐active‐bridge converter

Zou

Khaligh

2020

IET power electron.

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This study proposes a systematic approach to model and control a triple-active-bridge (TAB) converter for electric vehicle on-board charger applications. An innovative generalised-harmonic-approximation (GHA) modelling method is proposed to accurately predict the instantaneous current and voltage waveforms. Based on the GHA modelling, a control strategy for a TAB converter is proposed, which enables the power flow from grid to two batteries with high conversion efficiency while achieving zero-voltage switching operation. Compared to the conventional phase-shift modulation, the proposed control method achieves an extended operating range of simultaneous charging operation mode, especially under the unbalanced load conditions. As a proof-of-concept, a 600 W prototype is built and tested. The experimental results are presented including waveforms of different operation modes and efficiency measurements. The peak efficiency of the TAB converter under the G2B mode is measured as 97.6%. The experimental waveforms exhibit good agreement with the waveforms obtained through GHA modelling.

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Section: Introductionmentioning

confidence: 99%

Modelling and control of a triple‐active‐bridge converter

Zou

Khaligh

2020

IET power electron.

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“…1a. In the DC-DC stage, the merit of resonant converters has already been established mainly due to their soft-switching properties [6][7][8][9][10]. Among various resonant converter topologies, CLLC converter has shown prominent advantages [11][12][13][14][15], as the zero-voltage-switching (ZVS) capability for all loading conditions could largely reduce the switching losses.…”

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%

“…However, due to the high and almost constant voltage drop (∼1.4 V) across the body diode, it would generate high conduction loss and decrease the efficiency on a large scale. Another similar solution is to connect fast Schottky diodes in parallel to the secondary switches to reduce the voltage drop to ∼0.7 V and improve the reverse recovery process [8], but it would increase the output capacitance between the drain and source, which degrades the switching performance in high‐frequency applications. It also increases the size and cost of the overall system.…”

Section: Introductionmentioning

confidence: 99%

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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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“…APIDLY diminishing reserve of fossil fuels and increasing of environmental degradation have accelerated the development of new technologies to optimize the use of natural resources and to use nonconventional sources to serve increasing load demands [1], [2]. In this regard, industry and academia have been developing emerging technologies such as high-temperature superconducting (HTS) generators for large wind farms [3], [4], HTS cables for high-voltage transmission lines [5], [6], HTS power devices for sub-stations [7], HTS machines for transportations [8], [9], and a new variety of power converters for smart micro-grid [10], electric vehicles [11], and for grid connected renewable generation systems [12]. The high-frequency magnetic-link has become one of the promising technologies in designing new power converters due to its unparalleled features, such as galvanic isolation and voltage balancing capabilities.…”

Section: Introductionmentioning

confidence: 99%