Modeling and Optimization of an Integrated Transformer for Electric Vehicle On-Board Charger Applications

Zou, Shenli; Lu, Jiangheng; Mallik, Ayan; Khaligh, Alireza

doi:10.1109/tte.2018.2804328

Cited by 51 publications

(18 citation statements)

References 25 publications

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“…Lithium iron phosphate batteries are widely used in many electric vehicles because of their high charge-discharge current, slow capacity attenuation, and high safety. The Thevenin equivalent circuit model of lithium iron phosphate battery is shown in Figure 1 [13], where V cc is open-circuit voltage, R e is battery internal resistance, R p is polarization resistance, and C p is polarization capacitance. The equivalent impedance Z o of the batteries is…”

Section: Onboard Charging Methods For Electric Vehiclesmentioning

confidence: 99%

Onboard Charging DC/DC Converter of Electric Vehicle Based on Synchronous Rectification and Characteristic Analysis

Tao

Zhang

2019

Journal of Advanced Transportation

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The DC/DC converter is the core part of the two-stage electric vehicle Onboard Charger. At present, the phase-shifted full-bridge soft-switching DC/DC converter has problems such as difficulty in commutation of the lagging leg, voltage fluctuation on the secondary side of the transformer, and low efficiency. A full-bridge DC/DC converter with two clamp diodes and synchronous rectification is proposed in this paper. Clamping diodes are used to suppress the voltage oscillation of the secondary side of the transformer and provide the commutating energy of the lagging leg. Synchronous rectification reduces the loss of the switching device. The operating principle and control method of the DC/DC converter are analyzed, and the switching device loss is calculated. The simulation and experimental results show that, compared with the traditional DC/DC converter, the voltage impulse of the secondary side of the transformer is smaller, the efficiency is higher, and the soft switch can be realized in a wide load range, which satisfies the requirement of fast charging of vehicle-mounted batteries.

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Section: Onboard Charging Methods For Electric Vehiclesmentioning

confidence: 99%

Onboard Charging DC/DC Converter of Electric Vehicle Based on Synchronous Rectification and Characteristic Analysis

Tao

Zhang

2019

Journal of Advanced Transportation

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“…However, to be more accurate, the value of the required inductance depends on several other variables, depending on the converter topology, such as the duty cycle, the frequency and the efficiency. In a similar way in [14], the magnetizing inductance was considered as a fixed parameter for LLC converter which is not enough accurate design approach.…”

Section: Multi-objective Methodsmentioning

confidence: 99%

“…Genetic algorithms and Pareto optimality concept starts to be a common solution in the design of electromagnetic devices in the last decade [11][12][13][14][15][16][17][18][19][20][21][22]. The main feature of the GAs is their capability to handle numerous optimization variables and objective functions without losing accuracy in the convergence to the optimum Pareto front.…”

Section: Introductionmentioning

confidence: 99%

“…As an example, in some types of nonlinear problems, one variable or more can be at the same time an objective function and a design variable or it can also be a constraint. Few works were achieved to optimize the inductive components for power electronics such as [13] and [14]; however, no one of them addressed these issues. The goal of this paper is to deal with this problem.…”

Section: Introductionmentioning

confidence: 99%

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Multi-objective Pareto and GAs nonlinear optimization approach for flyback transformer

Barg

Bertilsson

2019

Electr Eng

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Design and optimization of high-frequency inductive components is a complex task because of the huge number of variables to manipulate, the strong interdependence and the interaction between variables, the nonlinear variation of some design variables as well as the problem nonlinearity. This paper proposes a multi-objective design methodology of a 200-W flyback transformer in continuous conduction mode using genetic algorithms and Pareto optimality concept. The objective is to minimize loss, volume and cost of the transformer. Design variables such as the duty cycle, the winding configuration and the core shape, which have great effects on the former objectives but were neglected in previous works, are considered in this paper. The optimization is performed in discrete research space at different switching frequencies. In total, 24 magnetic materials, 6 core shapes and 2 winding configurations are considered in the database. Accurate volume and cost models are also developed to deal with the optimization in the discrete research space. The bi-objective (loss-volume) and tri-objective (loss-volume-cost) optimization results are presented, and the variations of the design variables are analyzed for the case of 60 kHz. An example of a design (30 kHz) is experimentally verified. The registered efficiency is 88% at full load.

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“…Design optimization is now important in power electronics [8,9], as it offers a systematic framework for determining the optimal design of a converter for given requirements, enabling the comparison of different topologies in terms of key performance metrics such as volume and efficiency, providing also a consistent platform through which the interrelationships between different design variables, such as switching frequency and magnetics design, can be fullyunderstood.…”

Section: Introductionmentioning

confidence: 99%

Power-Dense Bi-Directional DC–DC Converters With High-Performance Inductors

Calderon-Lopez

Scoltock

Wang

et al. 2019

IEEE Trans. Veh. Technol.

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An investigation is described into the optimization of multi-phase, high power, bi-directional DC-DC interleaved converters suitable for Electric Vehicle (EV) applications. Two dual-interleaved topologies were considered initially for the optimization, the main difference being the magnetic devices: either discrete inductors (DI) or an Interphase Transformer (IPT). The comparison used a comprehensive multi-objective design optimization procedure for an 80 kW case study. High performance inductors comprising a split-core structure and dual-foil windings to reduce losses, and a 180 C core, enabled the DI to be competitive with IPT in terms of power density and efficiency. The optimized designs are validated experimentally with an 80 kW bi-directional SiC DC-DC converter, achieving a power density of 31.4 kW/L and specific power of 15.7 kW/kg. The study is then extended to 100-kW three and four-phase interleaved topologies.

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Modeling and Optimization of an Integrated Transformer for Electric Vehicle On-Board Charger Applications

Cited by 51 publications

References 25 publications

Onboard Charging DC/DC Converter of Electric Vehicle Based on Synchronous Rectification and Characteristic Analysis

Onboard Charging DC/DC Converter of Electric Vehicle Based on Synchronous Rectification and Characteristic Analysis

Multi-objective Pareto and GAs nonlinear optimization approach for flyback transformer

Power-Dense Bi-Directional DC–DC Converters With High-Performance Inductors

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