Patent ID: 9692406
Date: 2017-06-27
CPC Classifications: H02M,H03K

Claim:
1. A power device drive circuit for driving a power device that switches input voltage so as to be turned on and off, the power device drive circuit comprising: an output amplifier that applies a control voltage to a control terminal of the power device in accordance with an on/off control signal, thereby driving the power device so as to be turned on and off; and an internal power supply circuit that generates a drive power supply voltage for the output amplifier in accordance with a change in the input voltage, thereby causing the control voltage to change based on a corresponding change in the input voltage and the drive power supply voltage, wherein the internal power supply circuit is configured to change the drive supply voltage output to the output amplifier based on a change in the input voltage, such that the internal power supply circuit reduces the drive power supply voltage of the output amplifier when the input voltage rises, thereby reducing the control voltage, and reducing the short-circuit current of the power device.