Coherent Wireless Power Charging and Data Transfer for Electric Vehicles

Author(s): Chih-Cheng Huang and Chun-Liang Lin

DOI: 10.2174/9781681089461122010006

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AC Network Analysis

Pp: 55-70 (16)

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* (Excluding Mailing and Handling)

  • * (Excluding Mailing and Handling)

Abstract

SHS investigation development is considered from the geographical and historical viewpoint. 3 stages are described. Within Stage 1 the work was carried out in the Department of the Institute of Chemical Physics in Chernogolovka where the scientific discovery had been made. At Stage 2 the interest to SHS arose in different cities and towns of the former USSR. Within Stage 3 SHS entered the international scene. Now SHS processes and products are being studied in more than 50 countries.

Abstract

Wireless power transfer for vehicle charging is inducted between two power
pads. A power pad is combined with a tuned network (compensation network) to
construct a resonant circuit for efficiently transmitting and receiving large quantities of
energy. State-of-the-art wireless power transfer through inductive and magnetic
resonances has numerous potential applications. A simple tuned network with a series
or parallel inductor–capacitor (LC) circuit generates appropriate quality factors (Q
factors) for various applications, such as induction cookers. Because of misalignment
and a varying air gap between two power pads, specially tuned networks, such as
inductor–capacitor–inductor and inductor–capacitor–capacitor networks, have been
developed for various applications, such as electric vehicle charging. A tuned network
with a high Q factor can achieve long-distance wireless energy transmission. A
prototype system with magnetic resonance has been developed. This network can
wirelessly transmit power of 60 W with an efficiency of approximately 40% over a
distance of more than 2 m. A tuned network is constructed from an AC network, which
contains inductors and capacitors. Different types of LC networks produce different
effects. A series resistor–inductor–capacitor (RLC) resonant circuit can amplify
voltage, whereas a parallel RLC resonant circuit can amplify current. This chapter
describes the resonance principle, Q factor design, bandwidth, and selectivity of series
and parallel RLC circuits.

Keywords:

Inductive resonance, Inductor–capacitor–capacitor (LCC) network, Inductor–capacitor–inductor (LCL) network, Magnetic resonance, Quality factor (Q factor), Resonant circuit, Tuned network.

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