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Please explain the operation principle of IGBT.

Equivalent circuit of an IGBT is shown below. An NPN transistor is designed not to be driven by RBE.
Applying ON signal to gate of an Nch MOSFET changes conduction state.
As a result, base current flows from emitter to base. This base current decreases ON resistance of the Nch MOSFET. (conductivity modulation effect)

Equivalent circuit of IGBT

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