Abstract: The temperature of inverters and power semiconductor devices is detected at high speed and with high accuracy. The electronic control circuit includes a vector instruction circuit for calculating an efficiency value of an inverter corresponding to a torque instruction value, and a temperature estimation circuit for estimating a temperature of the power semiconductor element based on the efficiency value of the inverter and a duty cycle for driving the power semiconductor element constituting the inverter.

Abstract: The temperature of inverters and power semiconductor devices is detected at high speed and with high accuracy. The electronic control circuit includes a vector instruction circuit for calculating an efficiency value of an inverter corresponding to a torque instruction value, and a temperature estimation circuit for estimating a temperature of the power semiconductor element based on the efficiency value of the inverter and a duty cycle for driving the power semiconductor element constituting the inverter.

Abstract: A discharge control device controls a discharge bypass circuit for discharging a charge in a capacitor provided in a drive device for a motor that rotates wheels of a vehicle at time of a collision of the vehicle. The discharge control device includes a control circuit that makes the discharge bypass circuit start discharge if an induced voltage by the motor surpasses a predetermined threshold.

Abstract: A discharge control device includes a discharge circuit configured to include a switch and a resistor to discharge charges of a smoothing capacitor and a power converter which are connected to a high-voltage power supply. The discharge circuit sets the switch to an ON state to start the discharging for a fixed period when an ignition switch is changed from the ON state to an OFF state. The discharge circuit sets the switch to the OFF state to stop the discharging when the ignition switch is changed from the OFF state to the ON state during a period in which the discharge circuit performs the discharging.

Abstract: A discharge control device includes a discharge circuit configured to include a switch and a resistor to discharge charges of a smoothing capacitor and a power converter which are connected to a high-voltage power supply. The discharge circuit sets the switch to an ON state to start the discharging for a fixed period when an ignition switch is changed from the ON state to an OFF state. The discharge circuit sets the switch to the OFF state to stop the discharging when the ignition switch is changed from the OFF state to the ON state during a period in which the discharge circuit performs the discharging.

Abstract: A discharge control device controls a discharge bypass circuit for discharging a charge in a capacitor provided in a drive device for a motor that rotates wheels of a vehicle at time of a collision of the vehicle. The discharge control device includes a control circuit that makes the discharge bypass circuit start discharge if an induced voltage by the motor surpasses a predetermined threshold.

Abstract: A discharge control device controls a discharge bypass circuit for discharging a charge in a capacitor provided in a drive device for a motor that rotates wheels of a vehicle at time of a collision of the vehicle. The discharge control device includes a control circuit that makes the discharge bypass circuit perform discharge for a period set on the basis of a time for which the wheels rotate due to inertia at the time of the collision of the vehicle.