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One of the most common methods used to measure high voltage is using a voltage divider. While this method is fairly reliable for most low frequency high voltage measurements, the voltage divider encounters difficulty when measuring higher frequency voltage signals. In these instances, the signal measured by the voltage divider becomes susceptible to distortion and inaccuracy. One solution to measuring...
Wireless power transfer (WPT) via magnetic resonant coupling (MRC) proposed by a research team of Massachusetts Institute of Technology (MIT) in 2007 [1], has caused increasing interest in research and development of WPT technology. The WPT coils which are operated with the same resonance frequency are the core of the MRC-WPT. Until now, there have been two basic structures to implement MRC-WPT system...
Wireless charging is a safe and clean technique of contactless charging over a wide range of power levels for portable electronic products. Although the market for wireless charging in Watts to tens of Watts is growing rapidly, the performance of such wireless charging products is still inferior when compared to those utilizing traditional charging, especially when the resonant frequencies are not...
This paper presents the design of liquid detection sensor with low-frequency electromagnetic field. The purpose of this sensor is to detect a change in the conductivity or permittivity of the liquid. If the evaluation frequency is less than 100 kHz, skin effects would be negligible. This paper proposes sensor that consists of two cylindrical sensors, a solenoid coil and a cylindrical capacitor. For...
Ultrasonic transcutaneous energy transfer is an effective tool for powering medical implanted devices non-invasively. The power harvested by the implanted receiver is sensitive to the distance between the transmitting and receiving transducers, and to the orientation of one with respect to the other. This work describes an inductive link as a means for the contactless measurement of the voltage generated...
A novel simple design of birdcage type RF receiver coil for using in the 1H NMR (Nuclear Magnetic Resonance) imaging system operating at 1.5 T and 3.0 T has been demonstrated. The RF coil is a band pass type coil composed of legs and end rings and both legs and end rings are made of epoxy-etched copper strips on a single flexible circuit board. The important feature of the coil with multiple resonance...
A wireless power telemetry with self-calibrated resonant frequency is presented. The proposed calibration scheme adjusts the resonant frequency of inductively secondary coil to match the incident frequency of inductively primary coil. To adjust the resonant frequency of the secondary coil, the received power efficiency is improved. By experimented results, the overall power efficiency with frequency...
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