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Inductive Power Transfer (IPT) is a promising technology for the charging of the traction batteries of electric and hybrid electric vehicles due to the significant simplification of the charging process implied by the contactless transmission of the charging energy. Typically, Finite-Element (FE) methods are used to predict the power loss in the IPT coils, to calculate equivalent circuit parameters,...
This paper discusses the characteristics of a series-series compensated inductive power transfer system (IPT) with theoretical analysis and experimental results. To maximize system efficiency, two-stage structure, which includes a PFC stage and a resonant DC-DC stage operating in ZVS region, is proposed. One of the major design challenges in implementation of a practical contactless EV charger is...
We present a novel, wafer-level fabrication method of 3D solenoidal microtransformers using an automatic wire bonder. Automatic wire bonders allow to precisely shape 25 μm diameter wire around prefabricated yokes or magnetic cores within seconds. Former reports of wire bonded microcoils treated individual solenoids showing low mutual inductances, whereas in this study transformers with strongly coupled...
This paper investigates magnetic couplers which could potentially be installed within or around a kickstand of an electric bicycle to provide wireless charging capability to the bicycle. The bicycle kickstands considered were the side stand and bracket stand. A cylindrical solenoidal pickup and a solenoidal bar pickup are proposed to be housed in the side stand and bracket stand respectively. Two...
An optimize design process of inductors and transformers used in switching power converters is presented in this paper. An analytical modeling of conductor physical behavior was developed to match optimization requirements, and used to compare various components with different cores — coils geometries and wire technologies. Rigorous analytical modeling was applied to achieve minimization of the losses,...
Due to increasing environmental concerns and decreasing fossil fuel supplies, Electric Vehicles (EVs) are fast becoming attractive alternatives to conventional fossil-fuel driven vehicles. Inductive power transfer (IPT) is a method that can be used to transfer power to EVs over an air-gap, without the need for physical contacts. IPT systems can dramatically increase the range, convenience and safety...
Isolated half-bridge gate drivers are used in a variety of applications that range from motor drives to isolated power supplies. However, providing isolated, adequate and well-timed half-bridge gate drive signals in these applications presents its own set of challenges. This paper presents an isolated half-bridge gate driver which supports 4.5V to 18V gate drive voltages. The gate drive outputs can...
In this paper, a computational method that uses only the input voltage and current to identify the impedances of multiple loads in wireless power transfer systems without any direct load measurements is proposed. The method has been practically realized in a wireless power domino-resonator system comprising 8 resonators. A good degree of accuracy has been achieved in the practical verification. Although...
Electric Vehicles (EVs) are quickly gaining widespread interest as attractive alternatives to conventional petrol driven vehicles. If EVs can derive some or all of their electrical power from renewable sources, then they can significantly help to reduce global dependence on fossil fuels for transportation. Inductive power transfer (IPT) is a method that can transfer power to EVs over an air-gap without...
Wireless power transmission region stands out for its convenience in the applications where several terminals or movable terminals need to be charged. The conventional single coil excited charging region has the drawback of distance and angle limitation. To overcome the shortcoming, a charging region which is constructed by four emitting coils is proposed in this paper. This four emitting coils configuration...
In a wireless power transfer (WPT) system, efficiency of the power conversion stages is crucial so that the WPT technology can compete with the conventional conductive charging systems. Since there are 5 or 6 power conversion stages, each stage needs to be as efficient as possible. SiC inverters are crucial in this case; they can handle high frequency operation and they can operate at relatively higher...
Wireless power transfer (WPT) technology has become a popular idea in battery charging for both low- and high-power applications, such as mobile-phones and electric vehicles (EV). For charging portable devices, common ideas apply location sensing and turn on specific coils under the loads. This paper proposes a universal WPT system for multiple electronics devices. The system is based on LLC circuit,...
Recently, magnetic gearboxes (MGBs) are attracting more followers as they offer great benefits over conventional mechanical gearboxes including contactless operation, lower noise, lower vibration, and they are maintenance-free. Improving MGBs performance is one of the popular topics under research. Axial MGB is one of the magnetic gear topologies that is suitable for applications which require a physical...
The inductive characteristics of graphite thin slabs are investigated with the objective of designing convenient loads for domestic induction heating uses. For this purposes it is defined a figure of merit consisting of the increment of the resistance of a loaded planar coil with respect to the resistance of the coil in the air. The equivalent resistance of the coupled coil-slab system is obtained...
This paper presents the feasibility study of bipolar pads for extremely high efficiency wireless battery chargers used in electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV) applications. Due to the unconventional flux distribution in this system, a 3D finite element method was employed for its design and analysis. The importance of misalignment tolerance in this system is analyzed and...
High efficiency and low cost coil system design is one of the key points for wireless power transfer. In this paper, a optimization method with generic algorithm is presented. The coil track layouts are interpreted with binary strings in the design iterations. Some practical considerations and detailed implementations are introduced in the optimization procedure.
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