Pick-up transformer for ICPT applications

Boys, J.T.; Covic, Grant A.; Elliott, G.A.J.

doi:10.1049/el:20020874

Cited by 25 publications

(5 citation statements)

References 5 publications

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“…It could be divided into three types in short-range and mid-range WPT, which are inductive contactless power transfer (ICPT), magnetically-coupled resonant wireless power transfer (MCRWPT), and capacitive coupled power transfer (CCPT). Since the 1990s, the research of ICPT is reported [13][14][15]. In ICPT, the power is transmitted through the induced electromotive force and induced current between the primary coil and secondary coil.…”

Section: Introductionmentioning

confidence: 99%

Plane-Omnidirectional Wireless Power Transfer System Based on Vector-Controlled Flux Linkage

et al. 2021

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The major challenge for wireless power transfer (WPT) is to extend transfer distance and to broaden transfer direction, while a stable power can be transferred with high and constant efficiency. The multi-coil WPT system can transfer power on the plane or space omnidirectionally, but its output power and efficiency are usually difficult to keep stability. For a nonlinear wireless power transfer system based on parity-time (PT) symmetry, when the coupling condition of system can be satisfied, it can attain a stable power with high and constant efficiency, but it still has a dead-spot problem in the transfer direction. Therefore, this article proposes a design of a plane-omnidirectional WPT system, of which the coupling condition can be maintained across the plane. The transmitter coils are a pair of orthogonal coils which are named transmitter coils 1 and 2. Meanwhile, in the transmitting circuit, the positive direction of transmitter coil 1, which determines the positive direction of current and flux, is controlled by a reversed switch group (RSG) with a logic-check loop (LCL). Moreover, the theoretical analysis is shown that the proposed system can reverse the flux direction of transmitter coil 1 while the angle of transfer direction is overly large, then the coupling condition of the system after reversal can still be satisfied. Finally, the experimental results show that when the receiver coil moves around the transmitter coils on the whole plane, the stable output power of 14 W is maintained with an approximately constant transfer efficiency of 87%.INDEX TERMS Plane-omnidirectional, wireless power transfer (WPT), vector control, reversed switch group (RSG), constant transfer efficiency.

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Section: Introductionmentioning

confidence: 99%

Plane-Omnidirectional Wireless Power Transfer System Based on Vector-Controlled Flux Linkage

et al. 2021

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“…Inductive power transfer (IPT) technique is a new power supply technique that can transfer electric energy from power sources to loads through electromagnetic coupling without physical contact [1][2][3][4][5]. This new technique has developed rapidly and widely used in a number of applications, such as consumer electronics [6], biomedical implant devices [7], underwater power supplies [8], electric vehicles [9] and so on.…”

Section: Introductionmentioning

confidence: 99%

Variable parameter and variable frequency‐based IPT charging system with configurable charge current and charge voltage

Qiao

Cui

Yang

2020

IET Power Electronics

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Variable parameter (VP) or variable frequency (VF) methods for load-independent output current or output voltage in inductive power transfer (IPT) systems have been widely studied. This study proposes an IPT system based on series-series compensation topology with VP and VF methods to achieve constant-current-constant-voltage (CC-CV) charging for electric bicycles (EBs). The proposed IPT system can operate in CC and CV modes regardless of load conditions at two different operating frequencies with corresponding values of compensation capacitors. The rating current/voltage of the proposed method is configurable by altering the compensation capacitor and operational frequency. Therefore, one charging stand can be shared by various EBs to save the space and to cut the overall cost. Only one capacitor is needed for one EB specification. The proposed IPT system can achieve zero-voltage switching under all load conditions. An experimental prototype with two ratings of 48 V/3A and 60 V/4A is built to verify the feasibility of the proposed method. The experimental results demonstrate the feasibility of the proposed method.

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“…Transformers are an integral part of many circuits used in various applications [1–41]. The transformer constitutes the magnetic core and the windings, whose linear or non‐linear physical attributes such as core resistance, winding resistance, leakage fluxes etc., are frequency and temperature dependent [1–4].…”

Section: Introductionmentioning

confidence: 99%

Transfer functions of a transformer at different values of coupling coefficient

Ayachit

Kazimierczuk

2016

IET Circuits, Devices & Systems

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The low-and mid-frequency model of the transformer with resistive load is analysed for different values of coupling coefficients. The model comprising of coupling-dependent inductances is used to derive the following characteristics: voltage gain, current gain, bandwidth, input impedance, and transformer efficiency. It is shown that in the low-and mid-frequency range, the turns ratio between the windings is a strong function of the coupling coefficient, i.e., if the coupling coefficient decreases, then the effective turns ratio reduces. A practical transformer was designed, simulated, and tested. It was observed that the magnitudes of the voltage transfer function and current transfer function exhibit a maximum value each at a different value of coupling coefficient. In addition, as the coupling coefficient decreases, the transformer bandwidth also decreases. Furthermore, analytical expressions for the transformer efficiency for resistive loads are derived and its variation with respect to frequency at different coupling coefficients is investigated. It is shown that the transformer efficiency is maximum at any coupling coefficient if the input resistance is equal to the load resistance. Experimental validation of the theoretical results was performed using a practical transformer setup. The theoretical predictions were found to be in good agreement with the experimental results.

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Pick-up transformer for ICPT applications

Cited by 25 publications

References 5 publications

Plane-Omnidirectional Wireless Power Transfer System Based on Vector-Controlled Flux Linkage

Plane-Omnidirectional Wireless Power Transfer System Based on Vector-Controlled Flux Linkage

Variable parameter and variable frequency‐based IPT charging system with configurable charge current and charge voltage

Transfer functions of a transformer at different values of coupling coefficient

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