IEEE Power Electronics Magazine - March 2016 - 23
Controlled
Synchronous Rectifier
Variable Frequency
Resonant Inverter
SH
CP
+
-
CS
T
C
Load
VS
SD
+
Vo
-
SS
SL
fig 9 The diagram of inductive-coupled power stage with a series-resonant inverter and
a controlled synchronous rectifier (redrawn from [24]).
technique and the control design of
this wireless charger for a wide input
voltage range.
From the previously cited examples, it is clear that magnetic resonance based on high Q factors and
well-tuned resonators has been a common practice among biomedical and
power electronics communities for
many decades.
Midrange applications Based on
conduction, radiation, or Magnetic
resonance
Since Tesla described the use of WPT for
powering a lighting device (Figure 3),
most of the two coil WPT systems have
been designed for short-range applications. In 1937, an interesting midrange
three-coil WPT system for powering a
lamp was described [12]. Recently, several multiple coil WPT systems have been
reported. Before examples of midrange
WPT are described in this section, it is
necessary to introduce the concepts of
near-field coupling and midrange WPT.
■■Near-field distance is related to the
wavelength of the electromagnetic
wave and is usually defined as a distance within one wavelength m in a
general sense. In a stricter sense, a
distance of m/2r or 0.159m is considered as the range for near-field
coupling.
■■The concept of short- and midrange
WPT is related to the ratio of the
transmission distance d and the coil
dimension of the transmitter coil. In
general, short-range coupling refers
to a transmission distance less than
or equal to the dimension of the
transmitter structure. For a circular
unbeatable
priceperformance
ratio
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