Evaluation of power transfer efficiency with ferrite sheets in WPT system

Kim, Tae-Hyung; Yoon, Sehwa; Yook, Jong-Gwan; Yun, Gi-Ho; Lee, Woong Yong

doi:10.1109/wpt.2017.7953894

Cited by 28 publications

(13 citation statements)

References 9 publications

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“…As the demand for convenience is increased, WPT has found widespread applications in modern home appliances, namely LED TVs [11], kitchen appliances [12], and stage lighting systems [13]. Future trends in WPT applications are focusing on wireless networks and internet of things [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

et al. 2018

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To achieve a free-positioning wireless power transfer (WPT) system, the output power must be regulated throughout the operation. This paper presents a novel output power control of a WPT system, based on the model predictive control (MPC). The output power is predicted by utilizing the system's mathematical model. The optimal duty cycle for a desired output power is obtained through the minimization of the objective function, which is simple and easy to implement, with no need for gain tuning. The proposed controller is implemented on the primary side, without any measurement or communication devices on the secondary side. This reduces the cost, size, and complexity of the WPT system. The load resistance and mutual inductance identification method is also introduced. It is based on the reflected impedance knowledge, where only the information of primary current is required. Experimental results of the output power step response show better performance compared with conventional Proportional-Integral (PI) control. The proposed controller is experimentally validated on a 200 W kettle. The output power can be kept constant at 200 W while the kettle is laterally moved. With the proposed controller, the kettle can be placed freely up to 7 cm from the align position, which is 63.64% of the primary coil's outer radius.

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Section: Introductionmentioning

confidence: 99%

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

et al. 2018

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“…A promising WPT technique that has already entered as well the consumer as the industrial market is inductive wireless power transfer (IPT) [2,[21][22][23]. This near-field technique uses a varying magnetic field to transfer energy from a transmitter coil to a coupled receiver coil.…”

Section: Introductionmentioning

confidence: 99%

Coupling-Independent Capacitive Wireless Power Transfer Using Frequency Bifurcation

et al. 2018

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Capacitive wireless power transfer can be realized by mutually coupled capacitors operating at a common resonant frequency. An optimal load exists that maximizes either the efficiency or the power transfer to the load. In this work, we utilize the frequency bifurcation effect to propose a frequency agile mode that allows for a nearly coupling-independent regime. We analytically determine the operating conditions of the coupling-independent mode based on the different system gains. In this way, we obtain a solution that achieves nearly constant efficiency and power transfer, even at varying coupling. We compare our results to inductive wireless power transfer where a perfect coupling-independent mode is achievable.

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“…Aimed to meet this challenge and achieve the corresponding requirement, so far, the majority of WPT works involve inner three-dimensional (3-D) [9], outer two-dimensional (2-D) [10][11][12][13][14], and outer 3-D wireless power transfer [15][16][17][18][19][20]. Among them, M.J. Chabalko and A.P.…”

Section: Introductionmentioning

confidence: 99%

“…These scenarios are only suitable for the power transfer on the 2-D plane. To satisfy both high efficiency at far regions as well as uniform magnetic field distribution at close regions, asymmetric coil structures have been proposed previously in the literature [13,14], in which a RF power amplifier is also required; their scenarios have nothing to do with the moving and/or rotating of a load in the 3-D space. To implement wireless power transmission in the 3-D space, the use of three orthogonal coils to form an omnidirectional transmitter and similar 3-orthogonal-coil structure as the receiver has been considered as a scenario [15].…”

Section: Introductionmentioning

confidence: 99%

Power Transfer Efficiency Analysis for Omnidirectional Wireless Power Transfer System Using Three-Phase-Shifted Drive

Sun

Liu

et al. 2018

Energies

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In order to implement the omnidirectional wireless power transfer (WPT), a novel three-phase-shifted drive omnidirectional WPT system is proposed. This system is comprised of three independent phase-adjusted excitation sources, three orthogonal transmitting coils, and one planar receiving coil. Based on the mutual coupling theory, the power transfer efficiency is derived and the corresponding control mechanism for maximizing this efficiency is presented. This control mechanism only depends on the currents’ root-mean-square (RMS) values of the three transmitting coils and simple calculations after each location and/or posture change of the receiving coil, which provides the real-time possibility to design an omnidirectional WPT system comparing with the other omnidirectional systems. In aid of computer emulation technique, the efficiency characteristic versus the omnidirectional location and posture of the receiving coil is analyzed, and the analytical results verify the validity of the control mechanism. Lastly, a hardware prototype has been set up, and its omnidirectional power transmission capacity has been successfully verified. The experimental results show that the wireless power is omnidirectional and it can be effectively transmitted to a load even though its receiving coil moves and/or rotates in a 3-D energy region.

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Evaluation of power transfer efficiency with ferrite sheets in WPT system

Cited by 28 publications

References 9 publications

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

Coupling-Independent Capacitive Wireless Power Transfer Using Frequency Bifurcation

Power Transfer Efficiency Analysis for Omnidirectional Wireless Power Transfer System Using Three-Phase-Shifted Drive

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