公开(公告)号：US20240418772A1

公开(公告)日：2024-12-19

申请号：US18820651

申请日：2024-08-30

Applicant: ROHM CO., LTD.

Inventor： Takashi FUJIMURA ,  Takashi KIRA

IPC: G01R31/28 ,  G01R31/00 ,  G06F1/06 ,  H03K21/02 ,  H03K21/10

Abstract: A monitoring circuit includes first and second oscillators, first and second frequency dividers, first and second counters, a determination portion, and an identification portion. The first and second frequency dividers respectively divide frequencies of first and second clock signals outputted from the first and second oscillators, respectively. The first and second counters respectively count the numbers of clocks of the second and first clock signals at first and second numbers of periods of first and second frequency-divided signals outputted from the first and second frequency dividers, respectively. The determination portion determines, based on results of counting by the first and second counters, whether or not an abnormality has occurred in either of the first and second clock signals. The identification portion identifies, at the occurrence of an abnormality in either of the first and second clock signals, which of the first and second clock signals is in an abnormal state.

公开(公告)号：US20140117889A1

公开(公告)日：2014-05-01

申请号：US14060850

申请日：2013-10-23

Applicant: Rohm Co., Ltd.

Inventor： Takashi FUJIMURA ,  Hirofumi YUKI

IPC: H02P6/18

CPC classification number: H02P6/18 ,  H02P6/182 ,  H02P6/187

Abstract: A motor driving device of the present invention includes: a driver that receives supply of a power supply voltage to apply a plurality of phase voltages to a motor; a voltage-division phase voltage generation portion that divides each of the phase voltages to generate a plurality of voltage-division phase voltages; a neutral point voltage generation portion that combines and divides the phase voltages to generate a neutral point voltage; a selector that outputs any one of the voltage-division phase voltages as a selection voltage-division phase voltage; a comparator that compares the selection voltage-division phase voltage and the neutral point voltage to generate a comparison signal; and a controller that generates a selection control signal of the selector and an energization control signal of the driver according to the comparison signal.

Abstract translation: 本发明的电动机驱动装置包括：驱动器，其接收电源电压的供给以向电动机施加多个相电压; 分压相电压产生部，其分割各相电压，生成多个分压相电压; 中性点电压产生部分，其组合并分相相电压以产生中性点电压; 选择器，其输出任一所述分压相电压作为选择分压相电压; 比较器，比较选择分压相电压和中性点电压以产生比较信号; 以及根据比较信号产生选择器的选择控制信号和驾驶员的通电控制信号的控制器。

公开(公告)号：US20250047221A1

公开(公告)日：2025-02-06

申请号：US18793059

申请日：2024-08-02

Applicant: ROHM CO., LTD.

Inventor： Takashi FUJIMURA

IPC: H02P3/22

Abstract: A gate drive circuit is configured to drive a gate of a second switching device in a motor drive circuit, the motor drive circuit including a plurality of half-bridge circuits each including a first switching device, and the second switching device that is connected in series to the first switching device and that is provided on a low-potential side relative to the first switching device, the motor drive circuit being configured to drive a motor. The gate drive circuit includes: a current source unit that is configured to allow current to flow into the gate; and a current sink unit that is configured to draw current from the gate. The current source unit includes a first diode that is provided with an orientation in which a cathode of the first diode is directed to a side where the gate of the second switching device is present.

公开(公告)号：US20140117891A1

公开(公告)日：2014-05-01

申请号：US14062430

申请日：2013-10-24

Applicant: Rohm Co., Ltd.

Inventor： Takashi FUJIMURA ,  Muga IMAMURA ,  Hirofumi YUKI

IPC: H02P6/00 ,  H02J1/06

CPC classification number: H03K17/22 ,  H02J1/06 ,  H03K2217/0081 ,  Y02P80/23 ,  Y10T307/469

Abstract: A semiconductor device has a first chip and a second chip sealed in a single package. The first chip includes a regulator which generates an internal voltage from a supply voltage, a reset circuit which monitors the supply voltage and the internal voltage to generate a reset signal, and a controlled circuit which operates by being supplied with the supply voltage. The second chip includes a controlling circuit which generates a control signal for the controlled circuit by being supplied with the internal voltage. The reset signal is fed to both the controlling circuit and the controlled circuit.

Abstract translation: 半导体器件具有密封在单个封装中的第一芯片和第二芯片。 第一芯片包括从电源电压产生内部电压的调节器，监视电源电压和内部电压以产生复位信号的复位电路，以及通过提供电源电压进行操作的受控电路。 第二芯片包括控制电路，其通过被提供内部电压来产生受控电路的控制信号。 复位信号被馈送到控制电路和受控电路。