IEEE Power Electronics Magazine - March 2016 - 17
Wheeler states that Tesla is entitled to
either distinct priority or independent
discoveries of
■■the idea of inductive coupling
between the driving and the working circuits
■■the importance of tuning both circuits, that is, the idea of an oscillation transformer
■■the idea of a capacitance loaded
open secondary circuit.
The idea of an oscillation transformer
clearly refers to the use of magnetic
resonance in magnetically coupled circuits. The use of magnetically coupled
resonators operating under resonance
conditions has been a hallmark of Tesla's WPT research.
C
h
G
S
P
h
H
T
T
(a)
t
P
C
t1
S
T
G
Factors Related
to Magnetic Resonance
P
Many researchers have studied various
aspects of technologies related to the
magnetic resonance of coupled circuits. Because of the large amount of
work over the last century, this section
only cites some relevant examples.
Although this section does not serve as
a comprehensive review, it provides
evidence that many WPT concepts considered today were studied in the past.
S'
C
T
t
S
(b)
C
a
S
P
G
P
b
S
S
the Q Factor
T
C
d
(c)
fig 2 (a)-(c) The three examples of WPT setups suggested by Tesla [1].
Coils Tied
or Taped
5.6
Prim. 7 or 8 turns
No. 12 Rubber Cov. Wire
C
Transf. or Spt. Coil
While Tesla was aware of the needs for
using high frequency and winding with
low resistance, Estill Green published
an article about the story of Q [9] in
1955. According to Green, it was K.S.
Johnson who first used the symbol Q
in 1914 as the ratio of reactance to the
effective resistance in a coil or a condenser. Green goes on to note that
"Others before Johnson had made use
of the ratio of reactance to resistance
for either an inductor or a capacitor (to
us modem parlance). But Johnson's
role was to popularise this ratio and
assign it to the contagious symbol Q"
[9]. However, it is important to note in
[9, p. 7] that "A rather spectacular
recent achievement was the construction of an experimental ferrite inductor
with a Q of more than 1,000." This indicates that the idea of using an inductor
winding with Q higher than 1,000 was
conceived more than 60 years ago.
t1
P
P
S
24'
24'
4-5 Turns
No.16 Rubber
Cov. Wire
110 v. 16 C.P
Lamp
Keep Coils in Same Plane
fig 3 An application of Tesla's WPT system for powering a lamp.
March 2016
z IEEE PowEr ElEctronIcs MagazInE
17
Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - March 2016
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