Patent ID: 9595908
Date: 2017-03-14
CPC Classifications: H02M,H02P

Claim:
1. A power conversion apparatus for driving an electric motor, comprising: a power semiconductor device; a control device configured to control the power semiconductor device based on a torque command of the electric motor; a semiconductor temperature detector/estimator configured to detect or estimate a temperature of the power semiconductor device; and a torque command adjusting device configured to adjust the torque command, and including a proportional regulator configured to apply a proportional gain to a difference between the detected or estimated temperature value and a preset temperature, an integral regulator configured to integrate an output of the proportional regulator, a torque correction amount limiting device configured to generate a limited torque correction amount using the output of the proportional regulator and an output of the integral regulator, for adjusting the torque command by the limited torque correction amount, an adder configured to add the limited torque correction amount to the torque command, and a polarity reversing device configured to reverse a polarity of the limited torque correction amount according to a polarity of the torque command.