公开(公告)号：US20170338747A1

公开(公告)日：2017-11-23

申请号：US15599493

申请日：2017-05-19

Applicant: Futaba Corporation ,  O.S. ENGINES MFG. CO., LTD.

Inventor： Motoi NAKAJIMA

IPC: H02M7/06 ,  H02J7/00 ,  H02M1/084 ,  H02M3/335

CPC classification number: H02M7/06 ,  H02J7/0052 ,  H02J7/245 ,  H02M1/08 ,  H02M1/084 ,  H02M3/156 ,  H02M3/33507 ,  Y02T10/92

Abstract: A power supply device includes a rectifying unit for rectifying an AC input voltage, a voltage conversion unit including a switching element and configured to receive a rectified input voltage from the rectifying unit and obtain an output voltage voltage-converted by a switching operation of the switching element, and a voltage comparison unit configured to generate a comparison signal between the output voltage and a set output voltage. The power supply device further includes an oscillation unit configured to output a control signal having an oscillation period and an oscillation-stop period as a control signal for controlling an ON/OFF of the switching element. The oscillation period and the oscillation-stop period of the control signal are controlled by the comparison signal outputted from the voltage comparison unit, and a pulse duty ratio of the control signal in the oscillation period is variably controlled based on the input voltage.

公开(公告)号：US20200256302A1

公开(公告)日：2020-08-13

申请号：US16776661

申请日：2020-01-30

Applicant: FUTABA CORPORATION ,  O.S. ENGINES MFG. CO., LTD.

Inventor： Motoi NAKAJIMA

IPC: F02N11/04 ,  F02N11/08 ,  H02P3/06 ,  H02J7/00 ,  H02J7/14

Abstract: A motor driving device is provided. The motor driving device includes a driving unit configured to drive a starter motor/generator that is directly connected to an engine by a rotation shaft, by performing on/off control of switching elements in a bridge circuit for driving a motor; and a driving controller configured to control a driving operation for the starter motor/generator that is performed by the driving unit. The driving unit controls a motor driving voltage for the starter motor/generator by changing ON periods of the switching elements of the bridge circuit, and turns on predetermined switching elements of the bridge circuit at a predetermined timing to perform an active freewheel operation for boosting a regenerative voltage generated by the starter motor/generator. The driving controller instructs the driving unit to control the motor driving voltage and on/off of the active freewheel operation, based on a battery voltage.

公开(公告)号：US10103642B2

公开(公告)日：2018-10-16

申请号：US15599493

申请日：2017-05-19

Applicant: Futaba Corporation ,  O.S. ENGINES MFG. CO., LTD.

Inventor： Motoi Nakajima

IPC: G05F1/40 ,  H02M7/06 ,  H02J7/00 ,  H02M1/084 ,  H02M3/335 ,  H02M1/08 ,  H02M3/156 ,  H02J7/24

Abstract: A power supply device includes a rectifying unit for rectifying an AC input voltage, a voltage conversion unit including a switching element and configured to receive a rectified input voltage from the rectifying unit and obtain an output voltage voltage-converted by a switching operation of the switching element, and a voltage comparison unit configured to generate a comparison signal between the output voltage and a set output voltage. The power supply device further includes an oscillation unit configured to output a control signal having an oscillation period and an oscillation-stop period as a control signal for controlling an ON/OFF of the switching element. The oscillation period and the oscillation-stop period of the control signal are controlled by the comparison signal outputted from the voltage comparison unit, and a pulse duty ratio of the control signal in the oscillation period is variably controlled based on the input voltage.

公开(公告)号：US11041472B2

公开(公告)日：2021-06-22

申请号：US16776661

申请日：2020-01-30

Applicant: FUTABA CORPORATION ,  O.S. ENGINES MFG. CO., LTD.

Inventor： Motoi Nakajima

IPC: F02N11/04 ,  F02N11/08 ,  H02J7/00 ,  H02J7/14 ,  H02P3/06

Abstract: A motor driving device is provided. The motor driving device includes a driving unit configured to drive a starter motor/generator that is directly connected to an engine by a rotation shaft, by performing on/off control of switching elements in a bridge circuit for driving a motor; and a driving controller configured to control a driving operation for the starter motor/generator that is performed by the driving unit. The driving unit controls a motor driving voltage for the starter motor/generator by changing ON periods of the switching elements of the bridge circuit, and turns on predetermined switching elements of the bridge circuit at a predetermined timing to perform an active freewheel operation for boosting a regenerative voltage generated by the starter motor/generator. The driving controller instructs the driving unit to control the motor driving voltage and on/off of the active freewheel operation, based on a battery voltage.