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Green Energy Efficient Wired and Wireless Charging Techniques for IoT Enabled Healthcare Systems
Published in Gurjit Kaur, Akanksha Srivastava, Green Communication Technologies for Future Networks, 2023
Arshpreet Singh, Yaman Parashar
Inductive coupling is a type of wireless charging technique where the primary coil of a transmitter is responsible for producing significantly varying magnetic fields in the nearby secondary coil present within the receiver (Tesla et al. 2007). This magnetic power is quite capable in inducing current/voltage across the secondary coil, which further has been used to derive the associated circuitry and charge a storage system for full operation. The operational frequency of this technique typically lies in the Kilo Hertz range (Thidé et al. 2004). The given system performs well if the secondary coil is adjusted to the operating frequency but in the absence of the value of quality factors the proper required efficiency is usually maintained at a mere range of 20 cm (Tesla et al. 2006).
Electromagnetic Compatibility
Published in Ahmad Shahid Khan, Saurabh Kumar Mukerji, Electromagnetic Fields, 2020
Ahmad Shahid Khan, Saurabh Kumar Mukerji
Inductive coupling is also called magnetic coupling. It occurs when a time-varying magnetic field exists between two parallel conductors (or source and receiver) separated by a short distance typically less than a wavelength. A time-varying external current generates a magnetic field, which induces a disturbing voltage in a neighboring circuit. The strength of this coupling depends mainly on (i) the strength of disturbing current, (ii) the distance between source and drain, and (iii) the frequency of disturbing field. Thus, magnetic coupling is a geometry and frequency dependent phenomenon. The disturbing signal becomes significant when (i) the currents of the external circuits become large, (ii) the currents of a go-and-return line become unbalanced, (iii) the circuits are closely located and encompass a large area, and (iv) when the signals of external circuit vary rapidly in time and therefore possess large high-frequency contents.
Data over Power Line Operations
Published in Gilbert Held, Understanding Broadband over Power Line, 2016
In field trials conducted in the United States, the primary method used to bypass neighborhood transformers is commonly accomplished through the use of inductive coupling. In technical terms, inductive coupling represents the transfer of energy from one circuit to another due to the mutual inductance between the circuits. Inductive coupling is caused by the movement of current in a wire or on the metal of equipment. Similar to transformer theory described in the previous chapter of this book, moving currents generate magnetic fields, which create other moving currents in adjacent wires or conductors. Thus, the placement of a wire near the medium-voltage line behind the neighborhood transformer enables inductive coupling to pass the communications signal while bypassing the transformer. Although this method of bypassing the neighborhood transformer is relatively easy to accomplish, it is labor intensive and adds to the cost associated with providing a communications capability via the use of the electric grid.
Wearable electronic textiles
Published in Textile Progress, 2019
David Tyler, Jane Wood, Tasneem Sabir, Chloe McDonnell, Abu Sadat Muhammad Sayem, Nick Whittaker
Over short distances, inductive power transfer is used. Wire coils are used to provide inductive coupling, whereas metal plate electrodes are used for capacitive coupling. These technologies are used with RFID tags. Over longer distances, to enable power to be transferred, ways of focussing the direction of the electromagnetic waves must be implemented.
Multi-load constant current charging technology for wireless charging system
Published in International Journal of Electronics, 2020
Zhang Zhang, Zhou Xiaojuan, Xie Yulei, Xie Guangjun, Cheng Xin
The wireless charging system transfers energy based on the principle of inductive coupling. As shown in Figure 1, it consists of DC power supply, H-bridge inverter, series-series resonance compensation topology, full-bridge rectifier circuit, DC-DC converter, and primary/secondary control module.