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Figure 2.1 shows an example of a test circuit for measuring the output waveform with a common-
mode voltage (V
CM
Figure 2.1 Example of a test circuit for measuring the output waveform with a
An inverter contains discrete IGBT (or IGBT module) with a collector-emitter voltage (V
600 to 650V or 1200V. The 600V to 650V IGBTs are generally used at a supply voltage of 400V,
and 1200V IGBTs are commonly used at 800V. Typically, IGBTs have rise and fall times (t
t
) of roughly 100ns when switching. Under these conditions, the slew rate (dV/dt) of V
f
calculated to be 4kV/μs at a supply voltage of 400V and 8kV/μs at 800V. Figure 2.2 shows
examples of output waveforms of the TLP7820 when common-mode voltages (V
and 8-kV/μs slew rates are applied. As shown in Figure 2.2, V
which proves that the TLP7820 has enough CMTI performance to apply actual applications.
V
CM
)
(V
) - (V
OUT+
OUT-
V
: 1 kV/div
CM
(V
) - (V
): 100 mV/div
OUT+
OUT-
A）When dV/dt = 4 kV/μs
Figure 2.2 Example of output waveforms of the TLP7820 with common-mode voltages
© 2018
Toshiba Electronic Devices & Storage Corporation
) applied.
common-mode voltage (V
dV/dt = 4 kV/μs
t: 80 ns/div
(V
) applied
CM
V
CM
(V
) - (V
OUT+
OUT-
V
: 1 kV/div
CM
(V
) - (V
OUT+
OUT-
B）When dV/dt = 8 kV/μs
) applied
CM
5 / 19
RD014-RGUIDE-01
) with 4-kV/μs
CM
does not have much noise,
OUT
dV/dt = 8kV/μs
)
t: 80 ns/div
): 100 mV/div
) of
CE
and
r
is
CM
2018-03-15
Rev. 1
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