Analysis and parameters optimization of a contactless IPT system for EV charger

Chen, Rui; Zheng, Cong; Zahid, Zaka Ullah; Faraci, Eric; Yu, Wengsong; Lai, Jih-Sheng; Senesky, Matthew; Anderson, Dave; Lisi, Gianpaolo

doi:10.1109/apec.2014.6803528

Cited by 31 publications

(19 citation statements)

References 8 publications

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“…3 and 4 respectively, there is an observation of bifurcation phenomenon in the output power with variation with frequency. This bifurcation phenomenon is observed when either the coupling coefficient is high or the equivalent load is low [17]. In conclusion, the coil is over coupled in its designed working conditions.…”

Section: B Coil Characteristicsmentioning

confidence: 86%

A high frequency, high efficiency GaN HFET based inductive power transfer system

Cai

Pereira

Tanzania

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper aims to develop an Inductive Power Transfer (IPT) system targeting at Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV). IPT systems provide significant benefits over conventional plug-in chargers. However, in order for IPT to be adopted for EV charging, efficiency is a key Figure of Merit (FOM) which needs to be achieved. This paper develops an inverter using Gallium Nitride (GaN) power transistors which have the benefit of low on-resistance and gate charge to reduce the switching and conduction loss. A design methodology for optimising the switching performance of the power transistor is developed in order to minimise switching loss while keeping overshoot under control. An efficiency centric control method is proposed to improve the efficiency of the system, while ensuring sufficient power transfer. The evaluation results show that a GaN based system is capable of outperforming a SiC based system. At a gap of 150mm, the system obtains above 90% efficiency at 1.3 kW. The system efficiency peaks at 95% at 100 kHz operation and 92% at 250 kHz operation at a distance of 80mm for 2kW output power.

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Section: B Coil Characteristicsmentioning

confidence: 86%

A high frequency, high efficiency GaN HFET based inductive power transfer system

Cai

Pereira

Tanzania

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Several coupler designs are very popular and most commonly used for power EV charging, e.g., single-coil structure or multi-coil structures [25][26][27][28][29][30]. They are usually organized as follows: the windings sit above the ferrite shielding which guides most of the flux under the coil.…”

Section: Of 17mentioning

confidence: 99%

“…The laboratory test stand is shown in Figure 14. The system configuration ( Figure 14) enables us easily to evaluate either the overall system efficiency (25), including the power electronics, or the partial efficiency, corresponding to the power transmitted through the magnetic couplers. The input and the output power were measured with a power analyzer ZIMMER LMG 500, having a declared precision of 0.018% of the scale used for currents and 0.034% of the scale used for voltages.…”

Section: Experimental Prototype and Validation Measurementsmentioning

confidence: 99%

Generalized Design Approach on Industrial Wireless Chargers

et al. 2020

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The paper briefly discusses the most important standards and regulations established for high-power wireless power transfer systems and introduces the main issues concerned with the conceptual design process. It analyses the electromagnetic design of the inductive magnetic coupler and proposes key formulas to optimize its electrical parameters for a particular load. The method applies to both the resistive load and the battery charging. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of the leakage magnetic field.

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“…where V in is input voltage at the primary side, V out is the output voltage at the secondary side, and M is the mutual inductance of L p and L s . Since there is a rectifier with a capacitor filter, which acts as an impedance transformer, R L can be modified as an equivalent ac resistance R L − AC , which is introduced in [16][17][18]. The load resistance can be replaced by R L − AC , which is expressed according to the battery voltage V batt and the charge current I char as…”

Section: Frequency Modulation For CC and Cv Modes Battery Chargingmentioning

confidence: 99%

Step‐charging technique for CC/CV mode battery charging with low‐cost control components in IPT systems

Namgoong

et al. 2018

IET Power Electronics

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In wireless power transfer technology, power control technique is required to realise constant current (CC) and constant voltage (CV) modes for battery charging. CC and CV modes are needed to effectively charge lithium (Li)-ion batteries to ensure long life span and maximum capacity utilisation. The use of additional battery charging circuitry reduces efficiency, increases volume, and increases circuit complexity. The frequency modulation method is a method that can control power without an additional charging circuit, but a high-resolution controller is needed to control the voltage and current for charging the battery by frequency modulation. This study proposes a system that controls current and voltage for CC and CV modes through a step-charging method using a battery hysteresis with a low-cost control system. The in-band communication circuit is analysed and used to link the primary and secondary sides of the inductive power transfer (IPT) coils, which enables effective feedback control without an additional wireless communication module. This method enables high-efficiency charging while minimising the overall size and cost of mobile IPT applications such as power tools. The proposed system shows 90.3% transfer efficiency with a 20.75 V, 4 Ah Li-ion battery at 7 mm distance.

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Analysis and parameters optimization of a contactless IPT system for EV charger

Cited by 31 publications

References 8 publications

A high frequency, high efficiency GaN HFET based inductive power transfer system

A high frequency, high efficiency GaN HFET based inductive power transfer system

Generalized Design Approach on Industrial Wireless Chargers

Step‐charging technique for CC/CV mode battery charging with low‐cost control components in IPT systems

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