公开(公告)号：US20240161956A1

公开(公告)日：2024-05-16

申请号：US18282585

申请日：2022-03-04

Applicant: Hitachi Astemo, Ltd.

Inventor： Yasuo SHIMA ,  Yoichiro KOBAYASHI

IPC: H01F7/18

CPC classification number: H01F7/1844 ,  H01F7/1811 ,  H01F2007/1888

Abstract: A load drive device that drives and controls an inductive load based on a PWM signal from a microcomputer is provided, and the load drive device has excellent reliability and responsiveness capable of quickly detecting disconnection of the inductive load. The load drive device includes a microcomputer and a driver circuit that drives an inductive load by a pulse width modulation signal of a constant cycle based on a control command from the microcomputer, in which the driver circuit includes a current monitoring circuit that monitors a current flowing through the inductive load, and a disconnection diagnosis circuit that detects disconnection of the inductive load based on a current value detected by the current monitoring circuit, and the disconnection diagnosis circuit obtains a change amount of a current value detected by the current monitoring circuit, and when the change amount is equal to or less than a predetermined threshold, determines that the inductive load is disconnected and notifies the microcomputer of the disconnection.

公开(公告)号：US20230266405A1

公开(公告)日：2023-08-24

申请号：US18011461

申请日：2021-02-05

Applicant: Hitachi Astemo, Ltd.

Inventor： Yasuo SHIMA ,  Keishi KOMORIYAMA ,  Yoichiro KOBAYASHI

IPC: G01R31/54

CPC classification number: G01R31/54

Abstract: Poor opening is detected with certainty and reliability with respect to a ground line of an integrated circuit device regardless of the connection state of a load and the operating state of a drive circuit. In an integrated circuit device 10, a drive circuit 30 switches between conduction and interruption of a load current using switch elements 40 and 45. The ground line 31 is grounded via the GND terminal 32 to the common ground provided outside the integrated circuit device 10 and is connected to the drive circuit 30. The ground line 21 is grounded to the common ground via the GND terminal 22 and is connected to the control circuit 20. The diagnostic current supply circuit 90 supplies a predetermined diagnostic current to the ground line 31. The rectifying elements 61 and 62 are connected between the ground line 21 and the ground line 31. The diagnostic circuit 70 measures the potential difference between the ground line 31 and the ground line 21 and compares the potential difference with the predetermined comparison voltage 73 to diagnose the grounding state of the ground line 31.

公开(公告)号：US20220230794A1

公开(公告)日：2022-07-21

申请号：US17613326

申请日：2020-05-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Yasuo SHIMA ,  Keishi KOMORIYAMA ,  Yoichiro KOBAYASHI

IPC: H01F7/06 ,  H03K17/687

Abstract: Provided is a current control device capable of continuing feedback control for a solenoid in normal feedback control while preventing occurrence of an unintended valve operation due to flow of a reverse current.