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A high power inductive power transfer (IPT) system with overlapped transmitters driven by a multi-inverter topology is proposed in the paper. Each inverter drives an independent primary coil to transfer energy to the common secondary coil. A phase-shifted control strategy at inverter-level is proposed to regulate the output of the system. A dynamic model based on virtual resonant loop is proposed to describe the system with the phase-shift angle and the output voltage as the input and output variables, respectively. With the introduction of virtual resonant loop, n practical resonant loops at the primary side can be expressed by two equations, which greatly reduce the scale and order of the model. A PI controller is developed to evaluate the system regulating performance. A laboratory prototype driven by three inverters connected in parallel was built to verify the theoretical analysis. Experiments shown that the setting times were within 13 ms under load resistance and reference disturbances, which verified the validity of the model and the controller
Qijun Deng; Zhifan Li; Jiangtao Liu; Shuaiqi Li; Dariusz Czarkowski; Marian K. Kazimierczuk; Hong Zhou; Wenshan Hu. Multi-Inverter Phase-Shifted Control for IPT With Overlapped Transmitters. IEEE Transactions on Power Electronics 2021, 36, 8799 -8811.
AMA StyleQijun Deng, Zhifan Li, Jiangtao Liu, Shuaiqi Li, Dariusz Czarkowski, Marian K. Kazimierczuk, Hong Zhou, Wenshan Hu. Multi-Inverter Phase-Shifted Control for IPT With Overlapped Transmitters. IEEE Transactions on Power Electronics. 2021; 36 (8):8799-8811.
Chicago/Turabian StyleQijun Deng; Zhifan Li; Jiangtao Liu; Shuaiqi Li; Dariusz Czarkowski; Marian K. Kazimierczuk; Hong Zhou; Wenshan Hu. 2021. "Multi-Inverter Phase-Shifted Control for IPT With Overlapped Transmitters." IEEE Transactions on Power Electronics 36, no. 8: 8799-8811.
A coil with a high quality factor (Q) is desired to obtain a high efficiency for inductive power transfer (IPT). Q is proportional to the coil inductance and operating frequency, while inversely proportional to the coil resistance which increases with the raising of the frequency. An optimized frequency exists to obtain the maximum efficiency. Eddy currents and resulting AC resistance in Litz-wire coils are attributed to magnetic field. Especially, the induction component of the AC resistance is approximately proportional to the squared magnetic field where the coil exposed to. FEA simulations are conducted and surface integral method are employed to obtain the squared field. Additionally, the volume integral method is proposed to evaluate the overall effect of the field on the induction resistance. The optimized frequency for maximum efficiency is obtained based on the squared field calculation and resulting AC resistance evaluation. Sample prototype coils are manufactured to verify the resistance analysis methods. An IPT system is built employing these coils. Experiments show that the IPT system obtains the highest efficiency at frequencies closed to the predicted optimized ones
Jiangtao Liu; Qijun Deng; Dariusz Czarkowski; Marian K. Kazimierczuk; Hong Zhou; Wenshan Hu. Frequency Optimization for Inductive Power Transfer Based on AC Resistance Evaluation in Litz-Wire Coil. IEEE Transactions on Power Electronics 2018, 34, 2355 -2363.
AMA StyleJiangtao Liu, Qijun Deng, Dariusz Czarkowski, Marian K. Kazimierczuk, Hong Zhou, Wenshan Hu. Frequency Optimization for Inductive Power Transfer Based on AC Resistance Evaluation in Litz-Wire Coil. IEEE Transactions on Power Electronics. 2018; 34 (3):2355-2363.
Chicago/Turabian StyleJiangtao Liu; Qijun Deng; Dariusz Czarkowski; Marian K. Kazimierczuk; Hong Zhou; Wenshan Hu. 2018. "Frequency Optimization for Inductive Power Transfer Based on AC Resistance Evaluation in Litz-Wire Coil." IEEE Transactions on Power Electronics 34, no. 3: 2355-2363.
Spatial acoustic radiation characteristics analysis is the precondition of reducing the noise influence of outdoor power transformer while multi-physical field coupling method can be applied to quantify and reveal these acoustic characteristics of a running power transformer. In this study, based on the theoretical analysis about noise generation and dissemination process, an acoustic radiation model about oil-immersed power transformer was established and verified with field test data in time and frequency domain. Then, far-field analysis and directivity analysis were accomplished to characterize acoustic field of power transformer under multiple operating conditions. Finally, the acoustic radiation influence on potential surrounding buildings were analyzed and discussed. The visual results and conclusion provide acoustic guide for the optimal planning and design about both power substation and ambient buildings.
Liming Ying; Donghui Wang; Jinwei Wang; Guodong Wang; Xiaowen Wu; Jiangtao Liu. Power Transformer Spatial Acoustic Radiation Characteristics Analysis under Multiple Operating Conditions. Energies 2018, 11, 74 .
AMA StyleLiming Ying, Donghui Wang, Jinwei Wang, Guodong Wang, Xiaowen Wu, Jiangtao Liu. Power Transformer Spatial Acoustic Radiation Characteristics Analysis under Multiple Operating Conditions. Energies. 2018; 11 (1):74.
Chicago/Turabian StyleLiming Ying; Donghui Wang; Jinwei Wang; Guodong Wang; Xiaowen Wu; Jiangtao Liu. 2018. "Power Transformer Spatial Acoustic Radiation Characteristics Analysis under Multiple Operating Conditions." Energies 11, no. 1: 74.
Class-D full bridge is the most common inverter topology at the primary side for wireless electric vehicles (EVs) charging systems. This study takes a novel topology of a phase-controlled inverter as the power amplifier and puts it in a context of the whole charging system. The proposed inverter topology regulates the charging power through adjusting the phase-shift angle among phases with a constant operating frequency, which alleviates the EMI filter design. For various wireless EVs chargers, the gaps between the primary side and the secondary side are changing, which results in various coupling factors k. The equivalent resistance of the EVs battery Rbattery is also changing during the charging process. Even resonant frequencies at two sides are variable because of the components tolerances and operating environments. This study presents design considerations of a wireless EVs charging system with the proposed technology under variable k, Rbattery, and resonant frequencies. Circuit parameters are designed and the system efficiency is derived. Industrial prototype of an EV charging system is manufactured with the proposed topology at 3.0 kW. Experiments show that these design considerations can reflect the system characteristics, and the proposed system is a good candidate to be used in wireless EV battery chargers.
Qijun Deng; Jiangtao Liu; Dariusz Czarkowski; Mariusz Bojarski; Erdem Asa; Francisco de Leon. Design of a wireless charging system with a phase‐controlled inverter under varying parameters. IET Power Electronics 2016, 9, 2461 -2470.
AMA StyleQijun Deng, Jiangtao Liu, Dariusz Czarkowski, Mariusz Bojarski, Erdem Asa, Francisco de Leon. Design of a wireless charging system with a phase‐controlled inverter under varying parameters. IET Power Electronics. 2016; 9 (13):2461-2470.
Chicago/Turabian StyleQijun Deng; Jiangtao Liu; Dariusz Czarkowski; Mariusz Bojarski; Erdem Asa; Francisco de Leon. 2016. "Design of a wireless charging system with a phase‐controlled inverter under varying parameters." IET Power Electronics 9, no. 13: 2461-2470.