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Discussion

The junction temperature of a device in a drive is estimated from

  • A.the dc link voltage and the modulation index
  • B.its losses and the thermal resistances in the path to ambient
  • C.the ambient temperature alone
  • D.the switching frequency alone

Answer: B

Conduction and switching losses give the heat, and the junction-to-case, case-to-sink and sink-to-ambient resistances give the rise. Adding them to the ambient gives the junction temperature that has to stay within the device's limit.

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