公开(公告)号：US20200028458A1

公开(公告)日：2020-01-23

申请号：US16504015

申请日：2019-07-05

Applicant: CANON KABUSHIKI KAISHA

Inventor： Keiji Harada ,  Yuichi Naoi ,  Norio Sugiyama ,  Noboru Hada

IPC: H02P7/03 ,  H02P5/68 ,  H02P7/06 ,  B41J2/045

Abstract: The technique of the present disclosure has an object to perform PWM control of DC motors with a CPU and a motor drive circuit connected by a smaller number of serial interfaces, and provides a motor drive circuit comprising: energization control units to switch the directions of energization of motors by using switching elements to be driven by PWM signals; a reception unit to receive data indicating energization of the motor and the duty ratio of the PWM signal for each energization control unit from a computation apparatus by serial communication; a first signal generation unit to generate a motor control signal for controlling energization of the motor and the duty ratio based on the data for each energization control unit; and a second signal generation unit to generate the PWM signal having the duty ratio set according to the corresponding motor control signal for each energization control unit.

公开(公告)号：US10958197B2

公开(公告)日：2021-03-23

申请号：US16504015

申请日：2019-07-05

Applicant: CANON KABUSHIKI KAISHA

Inventor： Keiji Harada ,  Yuichi Naoi ,  Norio Sugiyama ,  Noboru Hada

IPC: H02P7/03 ,  B41J2/045 ,  H02P5/68 ,  H02P7/06

Abstract: The technique of the present disclosure has an object to perform PWM control of DC motors with a CPU and a motor drive circuit connected by a smaller number of serial interfaces, and provides a motor drive circuit comprising: energization control units to switch the directions of energization of motors by using switching elements to be driven by PWM signals; a reception unit to receive data indicating energization of the motor and the duty ratio of the PWM signal for each energization control unit from a computation apparatus by serial communication; a first signal generation unit to generate a motor control signal for controlling energization of the motor and the duty ratio based on the data for each energization control unit; and a second signal generation unit to generate the PWM signal having the duty ratio set according to the corresponding motor control signal for each energization control unit.