公开(公告)号：US20210233700A1

公开(公告)日：2021-07-29

申请号：US17230356

申请日：2021-04-14

Applicant: ROHM CO., LTD.

Inventor： Kosei OSADA ,  Isamu NISHIMURA ,  Tetsuya KAGAWA ,  Daiki YANAGISHIMA ,  Toshiyuki ISHIKAWA ,  Michihiko MIFUJI ,  Satoshi KAGEYAMA ,  Nobuyuki KASAHARA

IPC: H01F27/28 ,  H01L23/64 ,  H01L23/522 ,  H01L23/58 ,  H01L23/495

Abstract: The semiconductor device of the present invention includes an insulating layer, a high voltage coil and a low voltage coil which are disposed in the insulating layer at an interval in the vertical direction, a low potential portion which is provided in a low voltage region disposed around a high voltage region for the high voltage coil in planar view and is connected with potential lower than the high voltage coil, and an electric field shield portion which is disposed between the high voltage coil and the low voltage region and includes an electrically floated metal member.

公开(公告)号：US20240204772A1

公开(公告)日：2024-06-20

申请号：US18593692

申请日：2024-03-01

Applicant: Rohm Co., Ltd.

Inventor： Daiki YANAGISHIMA

IPC: H03K17/56 ,  H03H7/06

CPC classification number: H03K17/56 ,  H01L28/10 ,  H03H7/06

Abstract: A gate driver includes: a gate driving circuit configured to generate a gate driving signal for a power device according to a gate control signal; and a driving capacity switch circuit configured to raise the gate driving capacity of the gate driving circuit when a time-variation signal obtained by passing the gate driving signal in the on-transition period of the power device through a high-pass filter becomes lower than a threshold value.

公开(公告)号：US20230253963A1

公开(公告)日：2023-08-10

申请号：US18300511

申请日：2023-04-14

Applicant: Rohm Co., Ltd.

Inventor： Daiki YANAGISHIMA ,  Toshiyuki Ishikawa ,  Hirotaka Takihara

IPC: H03K17/691 ,  H03K17/61 ,  H04L25/02 ,  G01R31/27 ,  G01R31/28 ,  H02P31/00

CPC classification number: H03K17/691 ,  H03K17/61 ,  H04L25/028 ,  G01R31/27 ,  G01R31/2884 ,  H02P31/00

Abstract: Disclosed is a signal transmission circuit device (200) including a feedback signal transmission unit (210) that feeds back a control output signal (Sout) as a feedback signal (Sf) to an input side circuit (200A). A logical comparison circuit (212) detects “mismatch” between input and output by performing logical comparison between a control input signal (Sin) and the feedback signal (Sf). When a state of “mismatch” between input and output occurs, a first pulse generating circuit (202) or a second pulse generating circuit (204) outputs a first correction signal (Sa1) or a second correction signal (Sa2) corresponding to a potential (high level or low level) of the control input signal (Sin), and corrects the control output signal (Sout) to the same potential (high level or low level) as the control input signal (Sin). With such configuration, the mismatch

公开(公告)号：US20240322816A1

公开(公告)日：2024-09-26

申请号：US18673151

申请日：2024-05-23

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：US20230387185A1

公开(公告)日：2023-11-30

申请号：US18447832

申请日：2023-08-10

Applicant: ROHM CO., LTD.

Inventor： Masahiko ARIMURA ,  Daiki YANAGISHIMA

IPC: H01L23/00 ,  H01L25/10 ,  H01L27/01 ,  H01L27/06

CPC classification number: H01L28/24 ,  H01L24/05 ,  H01L25/105 ,  H01L27/016 ,  H01L27/0676 ,  H01L24/48 ,  H01L2225/1052 ,  H01L2924/19043 ,  H01L2224/48247 ,  H01L2224/05644

Abstract: This semiconductor device is provided with: a high-voltage die pad and a low-voltage die pad, which are insulated from each other; a resistive element which is mounted on the high-voltage die pad; and a semiconductor element which is mounted on the low-voltage die pad. The resistive element is provided with: a substrate which is mounted on the high-voltage die pad; an insulating layer which is formed on the substrate; and a thin film resistive layer which is formed on the insulating layer.

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：US20230261625A1

公开(公告)日：2023-08-17

申请号：US18305590

申请日：2023-04-24

Applicant: Rohm Co., Ltd.

Inventor： Masashi Nagasato ,  Seiji Takenaka ,  Tetsuo Tateishi ,  Daiki YANAGISHIMA

IPC: H03F3/45 ,  H02M3/158 ,  H03F1/52 ,  H03F3/217

CPC classification number: H03F3/45475 ,  H02M3/158 ,  H03F1/523 ,  H03F3/2171 ,  H03F2200/351 ,  H03F2203/45726

Abstract: This switching power source 100 has: a switching output circuit 110 which drives an inductor current IL by turning on and off an upper switch 111 and a lower switch 112 and generates an output voltage VOUT from an input voltage PVDD; a lower current detection unit 210 which detects the inductor current IL flowing through the lower switch 112 during an ON-period of the lower switch 112 and acquires lower current feedback information Iinfo; an error amplifier 140 which outputs voltage feedback information Vinfo including information on an error between the output voltage VOUT (feedback voltage FB) and a reference voltage REF; an information synthesis unit 220 that generates synthesis feedback information VIinfo by synthesizing Iinfo with Vinfo; and an information holding unit 230 which samples Vinfo during the ON-period of the lower switch 112.

公开(公告)号：US20230146017A1

公开(公告)日：2023-05-11

申请号：US17913586

申请日：2021-02-08

Applicant: ROHM CO., LTD.

Inventor： Akio SASABE ,  Daiki YANAGISHIMA

IPC: H03K5/08 ,  G01K7/01 ,  H03K5/24

CPC classification number: H03K5/08 ,  G01K7/01 ,  H03K5/2472

Abstract: A comparator circuit includes a first comparator configured to receive input of an input signal and a comparison target signal to be compared with the input signal, a first output stage including an N-channel transistor having a control terminal to which a first control terminal voltage output from the first comparator is applied, and a first clamp unit configured to limit the first control terminal voltage to be not higher than a first predetermined voltage that is higher than a first threshold voltage of the N-channel transistor but is lower than a first high side voltage output as high level from the first comparator when the first control terminal voltage is not limited.

公开(公告)号：US20220150096A1

公开(公告)日：2022-05-12

申请号：US17585877

申请日：2022-01-27

Applicant: DENSO CORPORATION ,  ROHM Co., Ltd.

Inventor： Junichi HASEGAWA ,  Yusuke MICHISITA ,  Kazuma TAKAHASHI ,  Daiki YANAGISHIMA ,  Masahiko ARIMURA

IPC: H04L27/14 ,  H04L7/027 ,  H04L7/033

Abstract: In a transmission circuit, a first pulse signal with a first frequency and a second pulse signal with a second frequency are output according to a rising edge and a falling edge of a first input signal, respectively. When a second input signal indicates an active level, the second pulse signal is output according to the falling edge of the first input signal and the second frequency is changed to a third frequency. In a reception circuit, a first level of a first output signal is changed to a second level according to a first induced signal via a transformer, the second level of the first output signal is changed to the first level according to a second induced signal via the transformer, and a second output signal is changed to an active level when a frequency of the second induced signal has changed to the third frequency.

公开(公告)号：US20180026611A1

公开(公告)日：2018-01-25

申请号：US15652514

申请日：2017-07-18

Applicant: Rohm Co., Ltd.

Inventor： Toshiyuki ISHIKAWA ,  Daiki YANAGISHIMA ,  Yoshizo OSUMI

IPC: H03K3/037 ,  H03K19/20 ,  B60L11/18

CPC classification number: H03K3/037 ,  B60L50/51 ,  H03K17/61 ,  H03K17/687 ,  H03K17/691 ,  H03K19/20 ,  H04L25/0266 ,  H04L25/493

Abstract: A signal transmission circuit which transmits N (N is a natural number of 2 or more) input signals includes a transmission signal generation portion, 2N transmission portions and an output portion. The transmission signal generation portion generates 2N transmission signals according to the N input signals. The 2N transmission portions respectively transmit the 2N transmission signals output from the transmission signal generation portion while performing electrical insulation. The output portion generates and outputs, based on the 2N transmission signals transmitted by the 2N transmission portions, N output signals that respectively indicate the N input signals. The transmission signal generation portion generates a pulse according to the N input signals and incorporates the pulse in only one of the 2N transmission signals at the same time.