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A new coil optimization procedure is proposed for inductively coupled wireless power transfer when square single-turn printed coils are used, by means of analytically modeling the self- and mutual-inductances, parasitic resistances, and parasitic capacitances of these coils. As an example, the average diameter and trace width of the transmitting coil and the trace width of the receiving coil are optimized...
This paper demonstrates fundamental evaluation results of a C-band rectifier using Si substrate for HySIC application. Usage of the Si substrate is attractive for future integration with other mixed signal circuit. Because of large loss tangent of the Si substrate, applicability as a circuit substrate to the C-band rectifier is discussed. Two types of the rectifier, conventional printed circuit board...
This paper proposes a Q-enhancement method to improve the quality factor of coils in a resonant inductive coupling wireless power transfer system (WPTS). The proposed WPTS increases the transfer power and the transfer efficiency, simultaneously, especially at transfer distance over the coil diameter. The proposed Q-enhancement method is verified both by calculation and simulation results, which match...
This paper presents the development of a hybrid Class-E synchronous rectifier for wireless powering of quad-copters through inductive power transfer. A synchronous rectifier relaxes the heatsink requirement for continuous operation as the transistor conduction losses will be lower than the diode conduction losses. This provides an advantage when the weight of the electronics is significant for the...
Determining an accurate circuit model for the chip of an RFID card is a complex task. We identify the prior work carried out to characterize such a chip and introduce a novel de-embedding method that provides higher accuracy through using a simple two port network. Additionally, a practical implementation of such a method is investigated and verified through measurements. Finally, the equivalent RC...
Due to the rising electrification, there is a need for innovative charging technologies to keep pace with technological progress and tethered charging. The electrical performance of wireless power transfer (WPT) systems is one crucial point in charging electric vehicles. The resonance frequency respectively the switching frequency of the converter has a large impact on system behavior. Due to component...
Wireless charging is a key technology for electric vehicles. Owing to strict area limits within a vehicle, low heat generation is important for realizing a thermally plausible coil. We therefore propose a parallel-connected bilayer coil to reduce heat generation. The effectiveness of the proposed coil was demonstrated by experimental continuous operation for more than 8 hours.
A simple design formula of a small circular wire coil is proposed for maximum Q-factor. For the formula, the inductance and resistance of the coils are calculated at 6.78 MHz using the volume filament method (VFM) by considering skin and proximity effects. In the calculations, coil radii of 10, 20, and 30 mm are used and the wire radius ranges from 0.2 mm to 0.5 mm. The quality factors (Q-factors)...
This study discusses the design process of a novel fully autonomous ultra-low power hybrid RF/photovoltaic energy harvesting system. As a result of the simulated and measured relationship between the output voltage of the rectifier and the load resistance value, the optimal rectifier topology and the charge tank capacitor value are analytically determined. One proof-of-concept designed and fabricated...
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