Drive circuit and power module including the same
AssigneeMitsubishi Electric Corporation
InventorTakeshi Horiguchi
Life of this patent
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Abstract
A drive circuit turns on an NPN transistor and a transistor in response to a turn-on command in a control signal to supply a positive current to a gate of a power transistor, and turns off the transistor after lapse of a certain time period to lower gate driving capability. The drive circuit turns on a PNP transistor and a transistor in response to a turn-off command in the control signal to supply a negative current to the gate of the power transistor, and turns off the transistor after lapse of a certain time period to lower gate driving capability.
Claims15
A drive circuit configured to drive a power transistor in response to a control signal, the drive circuit comprising:
- a current detector configured to detect a gate current of the power transistor;
- and
- a control circuit configured to operate based on a result of detection by the current detector and to lower gate driving capability of the drive circuit in response to lapse of a time period from a time point when the gate current reaches a first predetermined current value until appearance of a first Miller period.
Dependencies are inferred from the claim text.