Patent ID: 9503011
Filing Date: 2016-11-22
CPC Classification: H02P

Claim Text:
1. A motor driving method of driving a motor by using a motor driving device, wherein the motor driving device comprises: a drive transistor passing drive current to the motor when it is controlled to be on; and a regenerative transistor configuring a half bridge circuit in cooperation with the drive transistor and, when controlled to be on, passing regenerating current from the motor, wherein the motor driving device executes: a duty instructing operation of outputting a duty instruction value expressing ratio of an on period in a PWM cycle; a duty correcting operation of correcting the duty instruction value and outputting, as a corrected duty instruction value, any one of a first corrected duty instruction value and a second corrected duty instruction value in accordance with a magnitude relation between the duty instruction value and a duty reference value; a PWM signal generating operation of generating a PWM signal based on the corrected duty instruction value; and a drive operation of controlling the drive transistor to be on in the on period in the PWM signal, controlling the regenerative transistor to be on in an off period in the PWM signal, controlling the regenerative transistor from on to off in response to transition from the off period in the PWM signal to the on period, and controlling the drive transistor from off to on after off of the regenerative transistor is detected, wherein the first corrected duty instruction value is a value which changes with an increment same as an increment of the duty instruction value and in which an offset value as a constant is reflected, and wherein the second corrected duty instruction value is a value which changes with an increment different from an increment of the duty instruction value.