公开(公告)号：US12003204B2

公开(公告)日：2024-06-04

申请号：US17913361

申请日：2021-03-18

申请人： ROHM CO., LTD.

发明人： Ryota Miyagi ,  Hiroki Hashimoto

IPC分类号： H02P8/12 ,  H02P8/34

CPC分类号： H02P8/12 ,  H02P8/34

摘要： A driver device supplies an output current to each coil in a stepping motor to rotate a rotor. After the polarity and magnitude of the output current for each coil have reached the target polarity and magnitude, during control for keeping the polarity and magnitude of the output current for each coil at the target polarity and magnitude, occurrence of a particular current waveform in the output current due to a back-electromotive force resulting from the rotation of the rotor is detected so that, if a particular current waveform is detected, a predetermined detection signal is transmitted to an external device.

公开(公告)号：US12132434B2

公开(公告)日：2024-10-29

申请号：US17913371

申请日：2021-03-18

申请人： ROHM CO., LTD.

发明人： Ryota Miyagi ,  Hiroki Hashimoto

IPC分类号： H02P8/12

CPC分类号： H02P8/12

摘要： A driver device includes a control circuit for controlling an output stage circuit for supplying an output current to a coil, and makes a movable part move with the magnetism generated by the supplied output current. The control circuit can perform holding control to hold the state of the movable part unchanged by suspending its movement. During the holding control by the control circuit, application of an external force tending to change the state of the movable part against the holding control is detected based on the state of supply of electric power to the coil by the output stage circuit, the output current, or the current flowing through the output stage circuit.