这应该是米勒效应
解释如下：
All of the pictures above show waveforms measured at the gate-source terminals of power MOSFETs with the device switching no current. Only the MOSFET gate was being driven during these tests. There was no voltage applied to the drain terminals of the devices and they were not switching any load current. This condition allows easy comparison between the merits of different gate drive schemes. It also allows changes to be made to the gate-drive circuit without the risk of damaging the MOSFET if the change resulted in an unsuitable drive waveform.
However, it is worth noting that this does not represent the real life situation where the MOSFET is switching considerable power. The gate drive waveforms actually change slightly when the MOSFET is switching real current. This behaviour is due to something called "Miller Capacitance" which exists between the Drain terminal and Gate terminal of a MOSFET. This capacitance has a "negative feedback" effect on the MOSFET when it is undergoing a switching transition, and actually tries to prolong the switching transition, increasing switching losses! The Miller effect is also most noticeable in applications such as ours where the MOSFETs are operated at relatively high drain to source voltages.
大概意思就是空载时无电流。实际是给GD结电容充放电，这也会耦合到G极的驱动信号![txmiller.gif]()
解释如下：
All of the pictures above show waveforms measured at the gate-source terminals of power MOSFETs with the device switching no current. Only the MOSFET gate was being driven during these tests. There was no voltage applied to the drain terminals of the devices and they were not switching any load current. This condition allows easy comparison between the merits of different gate drive schemes. It also allows changes to be made to the gate-drive circuit without the risk of damaging the MOSFET if the change resulted in an unsuitable drive waveform.
However, it is worth noting that this does not represent the real life situation where the MOSFET is switching considerable power. The gate drive waveforms actually change slightly when the MOSFET is switching real current. This behaviour is due to something called "Miller Capacitance" which exists between the Drain terminal and Gate terminal of a MOSFET. This capacitance has a "negative feedback" effect on the MOSFET when it is undergoing a switching transition, and actually tries to prolong the switching transition, increasing switching losses! The Miller effect is also most noticeable in applications such as ours where the MOSFETs are operated at relatively high drain to source voltages.
大概意思就是空载时无电流。实际是给GD结电容充放电，这也会耦合到G极的驱动信号