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公开(公告)号：US11635472B2
公开(公告)日：2023-04-25
申请号：US17054973
申请日：2019-02-14
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Yuri Ohara , Yasushi Sugiyama , Takeo Yamashita , Masahiro Doi
IPC: B60W20/00 , G01R31/50 , B60W20/50 , B60W50/02 , H02P29/024
Abstract: A load driving device includes a synchronous rectifier circuit having a driving-side switching element and a reflux-side switching element; a driver control circuit controls the synchronous rectifier circuit; and a voltage monitor circuit that monitors whether the voltage of an output terminal of the synchronous rectifier circuit is within a predetermined voltage range; where the driver control circuit, upon receiving a diagnosis command, performs control so that when the driving-side switching element is switched from ON to OFF, the reflux-Side switching element is also switched to OFF; and the voltage monitor circuit detects a normal state when the voltage to be monitored is within a normal level during a period in which both the driving-side switching element and the reflux-side switching element are turned OFF.
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公开(公告)号：US11542885B2
公开(公告)日：2023-01-03
申请号：US17052888
申请日：2019-06-11
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Yasuo Shima , Yoshihisa Fujii , Takeo Yamashita
Abstract: With a simple configuration, responsiveness between an electronic control unit and a load drive circuit is monitored without deteriorating characteristics of the load drive circuit. The load drive circuit according to the present invention diagnoses an abnormality in responsiveness of a switch element that drives a load based on a drive command of the switch element and a signal at an output terminal of the switch element.
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公开(公告)号：US11459996B2
公开(公告)日：2022-10-04
申请号：US17274228
申请日：2019-08-08
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Yuri Ohara , Yasuo Shima , Masahiro Doi , Takeo Yamashita
Abstract: Provided is an electronic control unit capable of performing a high-accurate failure diagnosis in a short time as an electronic control unit having a failure diagnosis function. A load drive circuit that drives a load, a control circuit that controls the load drive circuit, and a diagnosis circuit that diagnoses an output state of the load drive circuit and outputs a diagnostic result to the control circuit are provided. The diagnosis circuit outputs a diagnosis completion flag indicating whether or not there is a diagnosis opportunity to the control circuit.
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公开(公告)号：US09780773B2
公开(公告)日：2017-10-03
申请号：US14769295
申请日：2013-12-13
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Takahiro Kawata , Ryoichi Oura , Masahito Sonehara , Yoshitaka Abe , Takeo Yamashita
CPC classification number: H03K17/16 , H03K3/012 , H03K3/013 , H03K17/08 , H03K17/164 , H03K2017/0806
Abstract: Provided is a load drive slope control device that can reduce EMI noise, and power loss and heat generation when a drive transistor is turned on and off, and can prevent excessive high temperature-induced damage to the drive transistor at an excessive high temperature. Disclosed is a load drive control device including: a drive transistor that drives a load; a pre-driver that drives the drive transistor via an ON/OFF control terminal of the drive transistor; a capacitor that is connected to an input side of the pre-driver, a first current source that is ON/OFF controlled by a first signal, and generates current which is charged to the capacitor; and a second current source that is ON/OFF controlled by a second signal, and generates current for discharging the capacitor, in which an output voltage from the pre-driver is changed by charging or discharging the capacitor, the drive transistor is turned on and off by the output voltage from the pre-driver, and a linear ascending gradient and a linear descending gradient of the waveform of a voltage driving the load are obtained by turning on and off the drive transistor.
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