Hitachi IGBT Module Application Manual
4.2.3 Gate Charge Characteristics
Figure 8 shows the relation between gate charge ( Q
G
) and gate-emitter voltage ( V
GE
), relating what
amount of electric charge is required to operate an IGBT, how to determine the power supply capacitance at
the output of a gate driver circuit, and how this information can be used to calculate the switching time.
Note:
Refer to comments in section 5.7 concerning dead time.
Figure 8. Gate Charge Characteristics
4.2.4 Forward Voltage Characteristics of a Free-Wheeling Diode
Figure 9 shows the forward voltage characteristics of a Free-Wheeling Diode (FWD). Such information
can be used for calculating power loss associated with the diode’s ON state.
Figure 9. Forward Voltage Characteristics of a Free-Wheeling Diode
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