A New Generation of Universal Contactless Battery Charging Platform for Portable Consumer Electronic Equipment

Inductive coupling is a viable scheme to wirelessly energize devices with a wide range of power requirements from nanowatts in radio frequency identification tags to milliwatts in implantable microelectronic devices, watts in mobile electronics, and kilowatts in electric cars. Several analytical methods for estimating the power transfer efficiency (PTE) across inductive power transmission links have been devised based on circuit and electromagnetic theories by electrical engineers and physicists, respectively. However, a direct side-by-side comparison between these two approaches is lacking. Here, we have analyzed the PTE of a pair of capacitively loaded inductors via reflected load theory (RLT) and compared it with a method known as coupled-mode theory (CMT). We have also derived PTE equations for multiple capacitively loaded inductors based on both RLT and CMT. We have proven that both methods basically result in the same set of equations in steady state and either method can be applied for short- or midrange coupling conditions. We have verified the accuracy of both methods through measurements, and also analyzed the transient response of a pair of capacitively loaded inductors. Our analysis shows that the CMT is only applicable to coils with high quality factor (Q) and large coupling distance. It simplifies the analysis by reducing the order of the differential equations by half compared to the circuit theory.

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“…Where Q 3 L = R P / ωL 3 is the loaded quality factor of the secondary coil [9], [30]. At resonance, C ref resonates out with,

k_{23}^{2} L_{2}

, leaving only the reflected resistance, R ref , on the primary side, as shown in Fig.…”

Section: Reflected Load Theorymentioning

confidence: 99%

The Circuit Theory Behind Coupled-Mode Magnetic Resonance-Based Wireless Power Transmission

Kiani

Ghovanloo

2012

IEEE Trans. Circuits Syst. I

373

192

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“…As a promising technology, IPT technology can transfer energy over an air gap of a certain size via a high frequency magnetic field. IPT technology has been successfully applied in several low power applications, such as mobile phones [3], sensors [4] and so on. For high power applications (rail locomotives, electric cars, buses and other hybrid electric vehicles) [5,6], it is a huge challenge for the single-receiver IPT system to get enough power from the transmitter other than from multiple-receiver systems, which could dramatically increase the capacity of receiving power.…”

Section: Introductionmentioning

confidence: 99%

A Maximum Efficiency Point Tracking Control Scheme Based on Different Cross Coupling of Dual-Receiver Inductive Power Transfer System

Liu

Yue

et al. 2017

Energies

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Abstract:One of the most promising inductive power transfer applications is the wireless power supply for locomotives which may cancel the need for pantographs. In order to meet the dynamic and high power demands of wireless power supplies for locomotives, a relatively long transmitter track and multiple receivers are usually adopted. However, during the dynamic charging, the mutual inductances between the transmitter and receivers vary and the load of the locomotives also changes randomly, which dramatically affects the system efficiency. A maximum efficiency point tracking control scheme is proposed to improve the system efficiency against the variation of the load and the mutual inductances between the transmitter and receivers while considering the cross coupling between receivers. Firstly, a detailed theoretical analysis on dual receivers is carried out. Then a control scheme with three control loops is proposed to regulate the receiver currents to be the same, to regulate the output voltage and to search for the maximum efficiency point. Finally, a 2 kW prototype is established to validate the performance of the proposed method. The overall system efficiency (DC-DC efficiency) reaches 90.6% at rated power and is improved by 5.8% with the proposed method under light load compared with the traditional constant output voltage control method.

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“…Previous research works have investigated different shapes of coil couplers for WPT [14][15][16][17][18]. But these works have not discussed the trade-off between the cost and the performance of the dynamic WPT charging system for EVs.…”

Section: Introductionmentioning

confidence: 99%

Cost-Effectiveness Comparison of Coupler Designs of Wireless Power Transfer for Electric Vehicle Dynamic Charging

et al. 2016

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This paper presents a cost-effectiveness comparison of coupler designs for wireless power transfer (WPT), meant for electric vehicle (EV) dynamic charging. The design comparison of three common types of couplers is first based on the raw material cost, output power, transfer efficiency, tolerance of horizontal offset, and flux density. Then, the optimal cost-effectiveness combination is selected for EV dynamic charging. The corresponding performances of the proposed charging system are compared and analyzed by both simulation and experimentation. The results verify the validity of the proposed dynamic charging system for EVs.

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A New Generation of Universal Contactless Battery Charging Platform for Portable Consumer Electronic Equipment

Cited by 422 publications

References 9 publications

The Circuit Theory Behind Coupled-Mode Magnetic Resonance-Based Wireless Power Transmission

The Circuit Theory Behind Coupled-Mode Magnetic Resonance-Based Wireless Power Transmission

A Maximum Efficiency Point Tracking Control Scheme Based on Different Cross Coupling of Dual-Receiver Inductive Power Transfer System

Cost-Effectiveness Comparison of Coupler Designs of Wireless Power Transfer for Electric Vehicle Dynamic Charging

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