IEEE Power Electronics Magazine - March 2016 - 24
D
transmitter coil, d # 2r , where r is
the radius of the coil. Midrange usually refers to a distance of several
times the dimension of the transmitter structure.
D'
B
B'
1900
A
A'
C'
C
L
G
M
fig 10 A diagram of one of Tesla's wireless
power experiments using conduction [25].
One of the early WPT systems suggested by Tesla for midrange application is
shown in Figure 10. It is a four-coil system. The transmitter side has a driving
loop C coupled to a transmitter coil A,
which significantly steps up the voltage
for an elevated terminal D. Similarly,
the receiver side has a load loop C'
coupled to the receiver coil A' which is
connected to an elevated terminal D'.
Through electrical oscillation, a current
is discharged through the air between
D and D' by conduction.
1937
In August 1937, a cover story appeared
in Short Wave & Television Magazine
[12] regarding an experiment deploying
a radio-frequency (RF) power transmitter to wirelessly power a 20-W lamp
over a distance of 10 ft (i.e., 3 m). The
operating frequency was 100 MHz. An
experimental setup [Figure 11(a)] was
installed in the Franklin Institute, Philadelphia (where Tesla had given the lecture). The unit on the left of Figure 11(a)
is the transmitter unit. This system is a
three-coil system, and its circuit is
shown in Figure 11(b). It includes a first
(a)
To
110 V
600-1000 V
10.000 X
20 w
To
110 V
100
MMF
2.000 V (Mica)
RFC
2.5 MH
Lamp
One-or Two-Turn
Coil
800
X
7.5 V
20 MMF
Variable
Condenser
1/4 m
Coil
(For 5 m)
4 T Heavy Wire
or Tubing, 1 in In
Dia. Turns Spread 1/4 in
Apart
Variable
Condenser
Same
As X
m = Wavelength
(b)
fig 11 (a) A midrange WPT setup in the Franklin Institute, Philadelphia, using radiation [12]. (b) An electric circuit for (a) [12].
24
IEEE PowEr ElEctronIcs MagazInE
z March 2016
B
Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - March 2016
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