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This paper is to present an effective wireless power transfer (WPT) system to recharge the battery of electric unmanned aerial vehicle (e-UAV). The proposed system can generate an approximately even magnetic field which allows the e-UAV to get enough energy at different points above the charging pad. Also, based on the design, the proposed system is capable to transmit enough power at a high efficiency...
An efficient vapor‐activated power generator based on a 3D polypyrrole (PPy) framework was demonstrated for the first time. By constructing the anions gradient in the PPy, this specially designed PPy framework provided free ionic gradient with the assistant of absorbing water vapor to promote the spontaneous transport of ionic charge carriers, thus leading to the intermittent electric output with...
An efficient moisture–electric‐energy transformation is discovered by means of establishing an oxygen functional group gradient in a graphene oxide film. The moisture variation serves as an energy source to generate electric power with an energy‐conversion efficiency of up to ≈62%. Based on this finding, a prototype power generator and a self‐powered respiratory monitor are demonstrated under the...
In this paper, a shape optimization for efficiency improvement of an interior permanent magnet (IPM) machine is presented for scooter. Usually scooter machine is limited to the space, so the optimization design for performance improvement with a limited volume and better features is necessary. The optimal design process by using the Kriging method combined with latin hypercube sampling (LHS) and genetic...
To avoid to be damaged when class D power amplifier chip load is short circuit, the paper presents a self-recovering over current protection circuit in chip. The over current protection circuit would active used to shut down the output buffer when two output pins short-circuit to power supply, short-circuit to ground or short-circuit to each other. Different from previously reported scheme, the scheme...
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