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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...
This paper presents a novel control method for wireless power transmission (WPT). The proposed method can maximize the power efficiency only by controlling the voltage ratio between the primary and the secondary side. Experimental measurement results of the prototype system with 3 kW power transmission show the efficiency difference between the proposed control method and the available maximum value...
Lateral misalignment between the transmitter (Tx) and receiver (Rx) in a wireless power transfer (WPT) system significantly reduces its power transmission efficiency. This paper first investigates the lateral misalignment in the magnetic resonance coupled (MRC) WPT system and identifies the High Efficiency Range (HER). The HER is a high efficiency area on the transmission efficiency versus Rx lateral...
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...
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...
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...
The purpose of this paper is to outline the effects of dye-sensitised solar cell (DSSC) configuration on useable output power provided through low-power, step-up DC-DC converters. It is shown that by connecting DSSCs in series rather than in parallel, higher power conversion efficiency is achieved due to increased cell voltage, and this in turn results in higher power delivery. Limitations to varying...
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.
A wireless wake-up receiver for lithium-ion battery systems was developed and evaluated. A 2-stage power-supply control scheme is added to the wake-up receiver for supporting low power, high receiving sensitivity, and short wake-up time simultaneously. When the battery system is in power-down mode, only a voltage detector in the wake-up receiver consumes a current while waiting for a wireless wake-up...
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,...
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