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Hitachi Power Semiconductors

High Voltage Monolithic ICs

Q1.What happens if a short circuit occurs within the load or in an IGBT Arm?

Not all Inverter ICs guarantee the output short circuit protection. If an output short circuit occurs, an IC may break, therefore care should be taken to offer external protection features where not built-in.

Q2.What happens during surge voltage conditions?

Inverter ICs do not guarantee surge voltage durability. The use of a surge suppressor diode is recommendation to limit applied voltage to less than or equal to the IC maximum rating.

Q3.Do all Inverters have an IGBT Arm short circuits prevent function?

No. Applied to the ICs: ECN30611/30601/30603/30604/30671/3053/3054/30531/30541.

Logic circuitry to prevent an arm short circuit is built into the ECN306* series and ECN3053/3054/30531/30541. However, delay time of an output should be considered with care, otherwise a short circuit state cannot be prevented completely. With an input signal, it is necessary to fix the dead time considering the output delay time. The setup of dead time can be found in the Inverter Application Technical Notes, Q10.

Q4.Do all Inverters have an over-current detection function?

Yes.

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