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Discharge Restrictive De-coupling
The circuit in Figure 1 operates on the same principles as the
de-coupling capacitor, but only during turn-o switching. As
the IGBT turns o, energy trapped in the loop inductance is
transferred to the capacitor. The diode blocks oscillations from
occurring and excess charge on the capacitor is discharged
through the external resistor.
• 1 or 2 wire taps for connecting external resistor
• Flame resistant case and epoxy, meets UL 94V0
• Other terminal pitches and capacitance values
available.
RCD Clamp
The function of this snubber is similar to a clamp, Figure 2. At
turn-o, the snubber diode is forward biased and the snubber
is activated. The energy trapped in the stray inductance is
absorbed by the snubber capacitor. During turn-on the snubber
caps that were fully charged to bus voltage have a discharge
path through the forward biased free-wheel diode, the IGBT,
and the snubber resistors. This reduces the reverse recovery
voltage transient.
Figure 1
Style SCM Discharge restrictive decoupling used
to protect dual IGBT modules
Figure 2
Style SCM “P” type and “N” type used as a clamp to protect
an inverter using two “single” IGBT modules
Typical Applications
Type SCM Single/Dual IGBT Snubber Capacitor Modules
High Peak Current Snubber with Integrated Hyperfast Diode
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