If the turn-off breaking current increases, di/dt increases as well and is causing an induced electromotive force L·di/dt due to the internal inductance in the module L. Hence, high voltage will be applied to the IGBT chip and might cause some avalanche breakdown. Therefore maximum voltage needs to be reduced when the current increases.
FAQ Categories: Usage
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Why does the maximum voltage in the RBSOA (non-repetitive) graph drop when the current is increased?
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Is the signal of the temperature output terminal TEMP of small IPM analog or digital?
It is an anolog signal.
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Is it possible to directly connect the output of the temperature output terminal TEMP of small IPM to the micro processing unit MPU?
The TEMP terminal can directly be connected to the MPU.
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If a pull-down resistor is attached to the temperature output terminal TEMP of small IPM, will the accuracy of the TEMP terminal output voltage change?
The accuracy does not change. The TEMP output voltage shows clamping characteristics at room temperature or below. Please attach a pull-down resistor, if linearity of the output voltage is required for temperatures below room temperature.
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Is it possible to adjust the dead time within the IPM?
IPMs do not have a dead time setting function. Please set an adequate dead time in the gate signal input from the outside.
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Once the protection function in Small IPM is triggered and the system stops, how can it be reseted: automatic reset or latch?
It will be reset automatically. After the alarm output period tFO elapsed and the cause of failure has been removed, the protection will reset automatically.
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Does an alarm occur, if the PWM signal is not transmitted to the control input terminal (Vin: High Level) of the V series IPM?
Since the TjOH protection and the UVLO protection are independent from input signals, an alarm signal will be issued when overheat or power supply voltage drop occurs. For Short Circuit (SC) and Over Current (OC) protection will be activated when the input signal is IGBT ON (Vin: Low Level).
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Which snubber capacitors are recommended for modules (M403, M404) used in a 3-level inverter?
There are several snubber capacitors with different withstand voltages and capacitances which meet the main terminal pitch. Please contact RUBYCON CORPORATION.
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The alarm output terminal VFO of the small IPM goes to low level when an anomaly occurs within the IPM. What is the alarm output pulse width tFO?
The alarm output period tFO is minimum 20μs, but typical value is about 50μs. The typical value, however, is not guaranteed.
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What do I have to take care of when using an IGBT module in a converter circuit?
If diode loss increases, check that the diode temperature does not exceed the absolute maximum ratings, and that ΔTvj power cycle capacity is satisfied. Also check that the system will not be broken due to inrush current at power-on or temporary interruption of power.