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PDF SKHI26F Data sheet ( Hoja de datos )
| Número de pieza | SKHI26F | |
| Descripción | Double IGBT driver | |
| Fabricantes | Semikron International | |
| Logotipo |  |
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1 page  
SEMIDRIVER SKHI 26W and SKHI 26F
High Power Double IGBT Driver
Technical Explanations
A. Properties and Functions of the Driver
1. The driver comprises short circuit protection for two
IGBTs in half bridge (pair of arms) connection. If a single
IGBT is driven, output TOP is to be used, and the
terminal CBOT of output BOT is to be connected to
terminal EBOT.
2. Short circuit protection is provided by measuring the
collector-emitter voltage. In case of short circuit the soft
turn-off circuit automatically increases the IGBT turn-off
time and hence reduces the DC voltage overshoot.
3. The IGBTs are turned on by applying a positive gate-
emitter voltage of 15 V, and turned off by a negative
gate-emitter voltage of - 8V. In case of a failure of the
supply voltage the gate-emitter connection is provided
by a 22 kΩ resistor.
4. The driver also comprises the auxiliary power supplies
for the two boosters which are isolated by DC/DC
converters.
5. The two IGBTs of the half bridge are interlocked in order
to prevent them from being in the on-state simulta-
neously. The locking time between the turn-off signal
for one IGBT and the release of the turn-on signal for
the other one is typically 3,3 µs (> tdoff).
6. In the case of a short circuit both IGBTs are turned off
immediately. An error memory prevents the IGBTs
from being turned on again. The status of this memory
may be fed back to the control circuit via an open
collector transistor (SKHI 26 W) (error signal). The error
memory is only reset when both input signals are zero.
7. The nominal voltage of the power supply VS is +15 V.
Its band of variation is from 14,4 to 15,6 V. The current
required is lower than 700 mA (conditions: 85 °C tem-
perature, VS = 15 V). Any undervoltage below +13 V
is monitored, and the IGBTs are turned off. An error
signal is released. Overvoltage is not monitored.
8. The switching signals are transmitted by isolating pulse
transformers. The isolation test voltages 2,5 kVAC.
The max. dv/dt rating between primary and secondary
side is 75 kV/µs.
9. The input and output signals are CMOS compatible, for
“W” version. The inputs have a Schmitt trigger charac-
teristic to suppress spurious pulses. The thresholds of
the inputs are
ViT+ = min. 12,9 V
ViT- = max. 2,1 V
10. The operating temperature range is 0 ... + 70 °C.
Typ SKHI 26W: Tamb = – 25 °C ... + 85 °C.
11. The typical delay times and propagation times for si-
gnals are
Turn-on: 1,0 + tTD
input to output
Turn-off: 1 µs
input to output
Error: 1 µs
error input to error signal
output
12. In order to optimise the turn-on and turn-off speed
resistors are connected, but external resistors Rg must
be added mainly for parallel connections, according to
the conditions of the given application. External resi-
stors Rg, Rex and Rcx should be mounted on additional
circuit board near the paralleled modules. The Rex
assumes a value of 0,5 Ω and its function is to avoid the
main current to circulate by the auxiliary emitter which
could make the emitter voltage against ground unba-
lanced.
The Rcx has a value of 47 Ω and its function is to create
an average of VCEsat in case of short circuit for VCE-mo-
nitoring (see Fig. 1).
13. The collectors of the IGBTs are connected to the driver
for monitoring the collector-emitter voltage VCE. VCEmax
= 1600 V. When paralleling modules, external resistors
Rcx should be mounted on an additional board near to
the modules.
B. Description of the Circuit Block Diagram
The circuit block diagram (Fig. 1) shows the input on the
left and the output on the right.
The input side comprises the following components:
1. Input Schmitt trigger, CMOS compatible
In the “F” version we have the necessary optic input
buffers respectively ERROR output circuit, to perform
the optical and electrical signals.
2. Interlock circuit
The interlock circuit prevents the IGBT turning on before
the gate charge of the other IGBT is completely dischar-
ged.
3. Short pulse suppression
The short pulse suppression makes sure that only
adequate trigger pulses are transmitted to the output
flip-flop.
4. Error monitoring
This circuit monitors pulses fed backwards via the pulse
transformers.
5. Inhibit pulse generator
by SEMIKRON
020227
B 14 – 69
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SKHI26F.PDF ] | |
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