公开(公告)号：US20230327662A1

公开(公告)日：2023-10-12

申请号：US18024086

申请日：2021-09-16

Applicant: ROHM CO., LTD.

Inventor： Takeshi KIKUCHI ,  Masato NISHINOUCHI ,  Akio SASABE ,  Daiki YANAGISHIMA

IPC: H03K17/18 ,  H02P29/024

CPC classification number: H03K17/18 ,  H02P29/0241

Abstract: A signal transmission device that transmits a driving signal for a power transistor from a primary circuit system to a secondary circuit system while isolating between the primary and secondary circuit systems includes; a first fault detection circuit configured to detect a fault in the primary circuit system; a second fault detection circuit configured to detect a fault in the secondary circuit system; a first signal transmission path configured to transmit the result of detection by the second fault detection circuit from the secondary circuit system to the primary circuit system while isolating between the primary and secondary circuit systems; and a self-test circuit configured to perform a self-test on each of the first fault detection circuit, the second fault detection circuit, and the first signal transmission path.

公开(公告)号：US20240007100A1

公开(公告)日：2024-01-04

申请号：US18250035

申请日：2021-10-21

Applicant: ROHM CO., LTD.

Inventor： Masato NISHINOUCHI ,  Akio SASABE ,  Takeshi KIKUCHI

IPC: H03K17/56 ,  H03K5/24 ,  H01G4/30

CPC classification number: H03K17/56 ,  H03K5/24 ,  H01G4/30

Abstract: A signal transmission device includes a capacitor having a first capacitor element and a second capacitor element connected in parallel such that electrodes of different polarities are connected together between them, and transmits an analog signal in a form converted into a pulse signal by use of a triangular-wave signal generated through charging and discharging of the capacitor.

公开(公告)号：US20230318882A1

公开(公告)日：2023-10-05

申请号：US18022807

申请日：2021-09-15

Applicant: ROHM CO., LTD.

Inventor： Takeshi KIKUCHI ,  Masato NISHINOUCHI ,  Akio SASABE ,  Daiki YANAGISHIMA

IPC: H04L25/02 ,  H03K17/691 ,  H03K17/567 ,  H03K19/173 ,  H02M1/08

CPC classification number: H04L25/0266 ,  H03K17/691 ,  H03K17/567 ,  H03K19/173 ,  H02M1/08

Abstract: A signal transmission device transmits a driving signal for a gate-driving transistor between a primary circuit system and a secondary circuit system while isolating between the primary and secondary circuit systems. The signal transmission device includes: a first external terminal configured such that the ground terminal of the secondary circuit system is connected to it; a second external terminal configured such that the terminal voltage at it varies according to whether the first external terminal is in an open state; and an open detection circuit configured to monitor the terminal voltage at the second external terminal to perform open detection for the first external terminal.

公开(公告)号：US20170276900A1

公开(公告)日：2017-09-28

申请号：US15456731

申请日：2017-03-13

Applicant: Rohm Co., Ltd.

Inventor： Masato NISHINOUCHI

IPC: G02B7/09 ,  H02P7/025

CPC classification number: G02B7/09 ,  H02P7/025 ,  H02P25/034

Abstract: A drive circuit, which is mounted on an electronic apparatus having a voice coil motor and drives the voice coil motor, includes: an interface circuit configured to receive a first signal indicating a target position of the voice coil motor and a second signal related to a posture of the electronic apparatus; a control circuit configured to generate a current command value of a drive current in response to the first signal and the second signal; and a current driver configured to generate the drive current in response to the current command value and supply the drive current to the voice coil motor.