Closed-Form Oriented Modeling and Analysis of Wireless Power Transfer System With Constant-Voltage Source and Load

Zhang, Yiming; Chen, Kainan; He, Fei; Zhao, Zhengming; Lü, Tao; Yuan, Liqiang

doi:10.1109/tpel.2015.2465847

Cited by 68 publications

(23 citation statements)

References 18 publications

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“…The advantages of CSI topology are inherent short-circuit protection, long lifetime of the inductor and reduced current stress; however, the inductor is always costly and high voltage stress occurs on the switches. Compared with CSI topology, the VSI topology, which is much more common in power electronics inverters presently, do not require bulky inductor and only use electrolytic capacitors to provide constant voltage [35]- [36]. When combining with resonance or compensation topologies in the WPT system, the advantages of VSI topology are even more prominent.…”

Section: A System Structurementioning

confidence: 99%

A 3-kW Wireless Power Transfer System for Sightseeing Car Supercapacitor Charge

Zhu

Jiang

et al. 2017

IEEE Trans. Power Electron.

289

126

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Abstract--Wireless Power Transfer (WPT) is the preferred charging method for electric vehicles (EVs) powered by battery and supercapacitor. In this paper, a novel WPT system with constant current charging capability for sightseeing car with supercapacitor storage is designed. Firstly, an optimized magnetic coupler using ferrite cores and magnetic shielding structure are proposed to ensure stable power transfer and high efficiency. Compared with the traditional planar shape ferrite core coupler, the proposed magnetic coupler requires lesser ferrite material without degrading the performance of the WPT system. Secondly, the model of supercapacitor is applied to the WPT system and the relationship between equivalent load resistances of supercapacitor and charging time is analyzed in detail. Then, a Buck converter with PI controller is implemented on the secondary side to maintain constant charging current for the variable load. Finally, the proposed design is verified by experiments. Constant charging current of 31.5 A across transfer distance of 15 cm is achieved. The peak transfer power and system efficiency are 2.86 kW and 88.05%, respectively.Index Terms--Charging current regulation, magnetic coupler, supercapacitor (SC), variable load, wireless power transfer (WPT).

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Section: A System Structurementioning

confidence: 99%

A 3-kW Wireless Power Transfer System for Sightseeing Car Supercapacitor Charge

Zhu

Jiang

et al. 2017

IEEE Trans. Power Electron.

289

126

View full text Add to dashboard Cite

show abstract

“…The DC motor is represented by the armature resistance R a , armature winding inductance L a and the back electromotive force (EMF) E. In the meantime, R p , R s1 , R s2 and R s3 are the resistances of the transmitter coil, the first receiver coil, the second receiver coil and the third receiver coil, respectively; C p , C s1 , C s2 and C s3 are the resonant capacitances that are connected in series with the transmitter coil, the first receiver coil, the second receiver coil and the third receiver coil, respectively; and L p , L s1 , L s2 and L s3 are the inductances of the transmitter coil, the first receiver coil, the second receiver coil and the third receiver coil, respectively. Assuming that the resistance and forward voltage drop of diodes are negligible and La is sufficiently high that the corresponding current ripple can be ignored, the average armature current Iai of the DC motor i (i = 1, 2, 3) can be expressed as [21]:…”

Section: System Designmentioning

confidence: 99%

“…Based on the principle of DC motor under the steady state, the electromagnetic torque T and E can be expressed as: Assuming that the resistance and forward voltage drop of diodes are negligible and L a is sufficiently high that the corresponding current ripple can be ignored, the average armature current I ai of the DC motor i (i = 1, 2, 3) can be expressed as [21]:…”

Section: System Designmentioning

confidence: 99%

Wireless DC Motor Drives with Selectability and Controllability

et al. 2017

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This paper proposes and implements the concept of wireless DC motor drives, which can achieve the abilities of selective driving and controllable speed. Due to different resonant frequencies of the multiple energy receivers of the associated DC motor drives, the transmitter can be purposely tuned to the specified resonant frequency which matches with the specified receiver, hence driving the specified motor selectively. In the meantime, the burst fire control is used to regulate the operating speed of the motor working at the resonant frequency, hence retaining the maximum power transmission efficiency. Both finite element analysis and experimentation are given to verify the validity of the proposed wireless DC motor drive system. For exemplification, three different resonant frequencies, namely 60 kHz, 100 kHz and 140 kHz, are selected to energize three DC motors. Under the burst fire control method, the speed of each motor can be regulated separately and the wireless power transfer (WPT) system can achieve the measured power transmission efficiency of about 60%.

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“…Authors of [12,13] describe how to achieve resonant compensation design to obtain a soft switching inverter. For the battery load, the system efficiency, transfer power and voltage gain are analyzed under the condition of SS compensation [14,15].…”

Section: Introductionmentioning

confidence: 99%

A High Efficiency Charging Strategy for a Supercapacitor Using a Wireless Power Transfer System Based on Inductor/Capacitor/Capacitor (LCC) Compensation Topology

Geng

Yang

et al. 2017

Energies

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Abstract:In the application of rail transit vehicles, when using typical wireless power transfer (WPT) systems with series-series (SS) compensation supply power for supercapacitors, the output current is in an approximately inverse relationship with the duty cycle in a wide range. This renders the typical buck circuit control inappropriate. In order to help resolve the above issues, this paper designs inductor/capacitor/capacitor (LCC) compensation with new compensation parameters, which can achieve an adjustable quasi-constant voltage from the input of the inverter to the output of the rectifier. In addition, the two-port network method is used to analyze the resonant compensation circuit. The analysis shows that LCC compensation is more suitable for the WPT system using the supercapacitor as the energy storage device. In the case of LCC compensation topology combined with the charging characteristics of the supercapacitor, an efficient charging strategy is designed, namely first constant current charging, followed by constant power charging. Based on the analysis of LCC compensation, the system has an optimal load, by which the system works at the maximum efficiency point. Combined with the characteristics of the constant voltage output, the system can maintain high efficiency in the constant power stage by making constant output power the same as the optimal power point. Finally, the above design is verified through experiments.

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Closed-Form Oriented Modeling and Analysis of Wireless Power Transfer System With Constant-Voltage Source and Load

Cited by 68 publications

References 18 publications

A 3-kW Wireless Power Transfer System for Sightseeing Car Supercapacitor Charge

A 3-kW Wireless Power Transfer System for Sightseeing Car Supercapacitor Charge

Wireless DC Motor Drives with Selectability and Controllability

A High Efficiency Charging Strategy for a Supercapacitor Using a Wireless Power Transfer System Based on Inductor/Capacitor/Capacitor (LCC) Compensation Topology

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