IEEE Power Electronics Magazine - March 2014 - 16
coupler performance is
not affected by the frequency, other than cable
and core losses. However,
lacking suitable highpower modules, multiple
IGBT TO247 devices connected in parallel resulted
in more burden on the
gate drivers. Therefore,
fig 6 The trackside power electronics and thermal management: from left to right, the input power conthis design was set aside
tactor and filter, the HF power inverter and coolant lines, a pair of terminal blocks to which the HF transfor a silicon carbide (SiC)
former is attached, and, at the far right, the liquid-cooling reservoir, pump, condenser, and cooling fans.
(Photo courtesy of ORNL.)
power inverter [2]. In
addition, the ORNL team
made significant contributions to WPT technology [3]-[13],
WPT Fundamentals
much of which was necessary for the proper execution of
The HF power inverter shown in Figure 2 consists of power
this in-motion demonstrator.
insulated-gate bipolar transistors (IGBTs) configured as a
Primary-side HF power is synthesized by the H-bridge
fully controlled H-bridge. Over the course of this project, the
inverter shown schematically in Figure 5, to which comORNL team used 600-V silicon IGBTs operating at 23 kHz but
mands are sent for frequency and duty cycle from a digital
capable of operating up to 28 kHz. With the availability of
signal processor (DSP) controller. More recent WPT designs
next-generation 150-kHz IGBTs, a trial inverter was fabricated
at ORNL employ a controllable power factor corrector stage
for operation at 48 kHz, with the intent of comparison testing
for variable dc link voltage, hence power regulation. In the
in-motion WPT at a higher frequency. Hence, the need to
present configuration, the duty cycle is fixed at d = 0.8
characterize WPT components in this range is evident. The
based on earlier work
that revealed a very rapid
escalation in reactive
400 ns
5 MS/s
Yokagawa
power at the source (V p
Uover:
400 ns
CH2 100 mVpk
Iover:
5 MS/s
in Figure 5) as d " 0.2.
V_PR
175.0 V
<< Main:2,000 >>
The source voltage (Vs in
I_PR
200.0 A
Figure 5) has two control
variables, voltage, U do,
and frequency, ~, given by
I_PR
V_PR
I_PR
V_PR
1.050 kV
62.50 A
I_SEC
V_SEC
I_SEC
V_SEC
Stopped
-62.50 A
-1.050 kV
121
(b)
2012/11/28 10:41:28
fig 7 The voltage and current waveforms for WPT at 23.5 kHz: (a) the primary voltage (square
wave) and sinusoidal current and (b) the secondary voltage (clipped sine) and sinusoidal current.
(Figure courtesy of ORNL.)
16
IEEE Power Electronics Magazine
4U do
r
r sin ` d 2 j
$ cos (~t) (Vrms) .
(2)
-200.0 A
-175.0 V
(a)
V_SEC
I_SEC
U s (t) =
z March 2014
The pr ima r y-side
track coils shown in Figure 1 and schematically in
Figure 5 are series tuned
to 22 kHz, and the dc
link voltage, U do, is controlled for the charging
power plus traction motor
demand of the GEM EV.
The power modules
fabricated at the ORNL
power electronics packaging laboratory are mounted
to the liquid-cooled heat
sink shown in Figure 5,
along with in-house-fabricated gate drivers and bus
Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - March 2014
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