公开(公告)号：US20250068790A1

公开(公告)日：2025-02-27

申请号：US18812521

申请日：2024-08-22

Applicant: ROHM CO., LTD.

Inventor： Kenji HAMACHI

IPC: G06F30/20 ,  G06F111/10

Abstract: A simulation apparatus comprises a model storage unit storing a motor physical model modeled by a wiring circuit section and a rotation motion equation section, and an abnormal state model obtained by modeling a motor abnormal state; and a model arithmetic unit configured to perform arithmetic processing using the motor physical model. The abnormal state model calculates an abnormal parameter indicating a deviation amount from a normal state, and the abnormal parameter is input to the motor physical model.

公开(公告)号：US20230284385A1

公开(公告)日：2023-09-07

申请号：US18178001

申请日：2023-03-03

Applicant: ROHM Co., LTD.

Inventor： Kenji HAMACHI

IPC: H05K1/14

CPC classification number: H05K1/141 ,  H05K2201/041

Abstract: Provided is a substrate including a first substrate including a first surface, and a second substrate including a second surface with an area smaller than the first surface and including a third surface with an area smaller than the first surface, the third surface facing the second surface, as viewed in a thickness direction of the first substrate, in which the first substrate includes a first signal line and a second signal line formed on the first surface, and the second substrate includes a first conductive portion formed on the second surface and able to come into contact with the first signal line, a second conductive portion formed on the second surface and able to come into contact with the second signal line, a third conductive portion and a fourth conductive portion formed on the third surface, a first conduction portion, and a second conduction portion.

公开(公告)号：US20210006173A1

公开(公告)日：2021-01-07

申请号：US16916954

申请日：2020-06-30

Applicant: ROHM Co., LTD.

Inventor： Kenji HAMACHI ,  Akeyuki KOMATSU

IPC: H02M3/335 ,  H02M1/08

Abstract: Disclosed are a rectifying circuit and a switched-mode power supply. The rectifying circuit includes a first rectifying section for rectifying a positive induced voltage generated across a secondary winding of a transformer, a second rectifying section for rectifying a negative induced voltage generated across the secondary winding, and an inductance section connected between the first rectifying section and the second rectifying section. The switched-mode power supply includes a transformer having a primary winding and a secondary winding, a drive circuit for switchingly driving the primary winding of the transformer, and the rectifying circuit connected to the secondary winding of the transformer.

公开(公告)号：US20220399827A1

公开(公告)日：2022-12-15

申请号：US17658327

申请日：2022-04-07

Applicant: ROHM Co., LTD.

Inventor： Kenji HAMACHI

IPC: H02M7/219 ,  H02M1/34 ,  H02M1/00

Abstract: Provided is a switch driving apparatus including a controller configured to individually control a first switch element and a second switch element included in a bidirectional switch, in which, when the controller stops on/off drive of the bidirectional switch, the controller turns off both the first switch element and the second switch element and then temporarily turns on one of the first switch element and the second switch element for a predetermined on time period.

公开(公告)号：US20220317226A1

公开(公告)日：2022-10-06

申请号：US17655880

申请日：2022-03-22

Applicant: ROHM Co., LTD.

Inventor： Kenji HAMACHI

IPC: G01R35/00 ,  G01R23/02

Abstract: A frequency characteristic measurement apparatus includes a calibration circuit configured to perform a SOLT calibration on cable end surfaces, a first measurement circuit measuring S-parameters of a first substrate provided with a DUT, after the SOLT calibration by the calibration circuit, a second measurement circuit measuring S-parameters of a second substrate after the SOLT calibration by the calibration circuit, and an extraction circuit performing a vector operation of a measurement result of the first measurement circuit and a measurement result of the second measurement circuit to extract S-parameters of the DUT. The extraction circuit assumes that a reflection of each of first second fixtures obtained by virtually dividing the second substrate into two parts at the center, on an end surface of the second substrate is equal to or smaller than a reflection on an end surface of the second substrate without the virtual division at the center.

公开(公告)号：US20210006148A1

公开(公告)日：2021-01-07

申请号：US16915372

申请日：2020-06-29

Applicant: ROHM Co., LTD.

Inventor： Kenji HAMACHI ,  Akeyuki KOMATSU

IPC: H02M1/08 ,  H02M3/335 ,  H02M1/36

Abstract: Disclosed are a switch driving device, in which individual zero voltage switching control of a first switch element and a second switch element forming a bidirectional switch is performed, and a switching power supply including a primary winding to which an alternating-current input voltage is applied, a secondary winding electromagnetically coupled to the primary winding, the bidirectional switch connected in series with the primary winding, a resonance capacitor connected in parallel with at least one of the bidirectional switch and the primary winding, a full-wave rectifier circuit that performs full-wave rectification of an induced voltage occurring in the secondary winding, a smoothing capacitor that smooths output of the full-wave rectifier circuit, and the switch driving device that drives the bidirectional switch. The alternating-current input voltage is directly converted into a direct-current output voltage by extracting a flyback voltage or a forward voltage and the flyback voltage from the secondary winding.