Patent ID: 11916503
Assignee: AISAN KOGYO KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A motor control device configured to drive a motor connected to an inverter, wherein
the inverter comprises a plurality of switching element pairs, each of which is constituted of an upper arm element and a lower arm element connected to each other in series, the upper arm element being connected to a high voltage side of a power supply and the lower arm element being connected to a low voltage side of the power supply,
the motor control device is configured to:
perform PWM control in which a first element that is on-selected for energizing the motor is switched based on a duty cycle, the first element being one of the upper arm element and the lower arm element;
determine a duty command value for switching a second element so that the motor control device performs complementary PWM control in which the second element connected in series with the first element is turned on for a predetermined time during an off-period of the first element, and perform the complementary PWM control when the determined duty command value is less than or equal to a threshold value;
when the determined duty command value is greater than the threshold value, set a first period and a second period for the first element, the first period being a period in which the first element remains turned on over a plurality of carrier cycles, the second period being a period for performing control with a corrected duty cycle in which the first element is turned off for a period extended by a period during which the first element is not turned off in the first period, and perform average PWM control of which average duty cycle in a total period of the first period and the second period is same as a set duty cycle; and
turn on the second element while the first element is turned off in the second period.