Abstract
Wireless inductive power transfer can enhance user convenience and safety
in the charging of electric vehicle batteries. This method can be used for transmitting
high power through an air gap of 0.01–0.2 m at the efficiency of up to 90%, a quality
factor (Q factor) of approximately 5–100, a coupling factor of approximately 0.2–0.5,
and a fundamental operating frequency of hundreds of hertz to several hundred
kilohertz. A longer wireless power transmission distance can be achieved by using
resonant tanks with magnetic coupling in which the source and load are not in contact
than can be achieved through wireless inductive power transfer. With the
aforementioned tanks, efficient wireless power transmission can be achieved with a Q
factor of approximately 100–10 000, a coupling factor of less than 0.2, and an
operating frequency range of 0.2 to 20 MHz. The aforementioned two methods are
based on the principle of electromagnetic induction. Implementation of these methods
requires the use of advanced semiconductors, high-frequency switching components
with low power loss, a tuned compensation network that can tolerate lateral
misalignment between coils, and a power pad design that enables high magnetic flux to
be generated for transmission over a relatively long distance.
Keywords: Compensation network, Electric vehicle (EV) battery charging, Highfrequency switching components, Inductive power transfer, Magnetic resonance coupling.
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