公开(公告)号：US11208977B2

公开(公告)日：2021-12-28

申请号：US16485217

申请日：2018-01-24

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Masato Kita ,  Yoichiro Kobayashi

IPC: F02P3/05 ,  G01R19/165 ,  G05F1/56 ,  H03K17/567

Abstract: To provide an ignition control device of an internal combustion engine capable of reducing the number of adjustment steps required for adjustment such as matching of a MOS gate voltage or the like without being affected by device variation. A detection voltage is generated on the basis of a primary current flowing through a current detection resistor having a positive temperature dependent characteristic. A reference voltage is generated by a potential difference between a base and an emitter of a first bipolar transistor circuit and a multiple type second bipolar transistor circuit in which a plurality of bipolar transistors are connected in parallel, and a resistance value of a first resistor connected to the emitter side of the plurality of the bipolar transistor circuit, on the basis of a current having a positive temperature dependent characteristic similar to the current detection resistor.

公开(公告)号：US10587263B2

公开(公告)日：2020-03-10

申请号：US16469537

申请日：2017-11-06

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Takahiro Kawata ,  Yoichiro Kobayashi ,  Mitsuhiko Watanabe

IPC: H01L25/00 ,  H03K17/687 ,  G01R31/26 ,  H01L27/12 ,  H02M7/48 ,  H01L21/76 ,  H01L27/04 ,  H01L21/762 ,  H01L21/822 ,  H02P25/04 ,  H02P27/06

Abstract: Provided are a load drive apparatus in which a semiconductor chip using DTI for inter-element separation is mounted, the load drive apparatus being capable of diagnosing a dielectric strength voltage of the DTI and highly reliable and a failure diagnosis method of the load drive apparatus. There is provided a load drive apparatus in which a semiconductor chip is mounted. The semiconductor chip includes a load drive output unit formed on a semiconductor substrate. The load drive output unit has a first region where an MOSFET that controls load driving is formed and a second region insulated and separated by DTI from the first region and includes a first leakage current detection element provided in the first region, a second leakage current detection element provided in the second region, and a failure detection unit that determines a failure of the load drive output unit.

公开(公告)号：US11098689B2

公开(公告)日：2021-08-24

申请号：US16963893

申请日：2019-01-11

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Yasuo Shima ,  Koji Shibata ,  Yoichiro Kobayashi

IPC: F02P3/04

Abstract: It is made possible to control ignition appropriately.
An ignition device 1 for an internal combustion engine includes a spark coil 50 including: a primary side coil 51 connected to a direct current power supply 40 and a secondary side coil 52 magnetically connected to the primary side coil 51 and connected to an ignition plug 60; a switch element 30 that performs switching between energization and interruption of primary current I1 to the primary side coil 51; and a switch element controlling circuit 20 that controls the switch element 30 on the basis of an ignition controlling signal 51 supplied from an ECU 10. A turn-on delay adjustment circuit 22 that delays a control timing of the switch element 30 is disposed between the ECU 10 and the switch element 30 such that first resonance noise generated due to interruption of the primary current I1 to the primary side coil 51 is reduced.

公开(公告)号：US11604483B2

公开(公告)日：2023-03-14

申请号：US16636953

申请日：2018-07-17

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Keishi Komoriyama ,  Minoru Migita ,  Yoichiro Kobayashi

IPC: G01R31/28 ,  G05F3/26 ,  G05F1/10 ,  G01R19/00 ,  H01F7/06 ,  H03K5/24

Abstract: The present invention maintains the accuracy of a reference current used in a functional circuit. Disclosed is a current generator circuit including a functional circuit and a diagnostic circuit. The functional circuit uses a reference current. The diagnostic circuit diagnoses the reference current in accordance with a comparison result obtained from comparison between the period of a periodic signal generated based on the reference current and the period of a reference clock inputted from the outside.

公开(公告)号：US11043508B2

公开(公告)日：2021-06-22

申请号：US16970645

申请日：2019-01-28

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Shinichirou Wada ,  Yoichiro Kobayashi ,  Masato Kita

IPC: H01L27/12 ,  H03K17/687 ,  G05F3/26

Abstract: A semiconductor device obtains high current ratio accuracy by eliminating an influence of plasma charging using a MOS-type transistor in which a channel region is isolated and separated from a semiconductor substrate. In a current mirror circuit in which both of a well of a NMOS-type transistor that generates a bias and a well of a NMOS-type transistor that receives the bias are formed insulated and separated from a semiconductor substrate, a connection circuit is connected between gate electrodes and wells of NMOS-type transistors without through the semiconductor substrate, and the connection circuit makes the gate electrodes and the wells in an electrically short-circuited state during manufacturing of the current mirror circuit, and makes the gate electrodes and the wells in a disconnected state in at least one direction during a mounting operation.

公开(公告)号：US11319918B2

公开(公告)日：2022-05-03

申请号：US16755996

申请日：2019-01-08

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato Kita ,  Yoichiro Kobayashi

IPC: F02P3/00 ,  F02P3/055

Abstract: Provided is an internal combustion engine ignition device capable of preventing an output signal level of a drive circuit from changing sharply when shifting from a normal ignition operation mode to a protection operation mode while reducing the cost of dedicated components and the like. An internal combustion engine ignition device of the present invention includes a first differential circuit for outputting a drive signal in a first mode and a second differential circuit for outputting a drive signal in a second mode, where the first differential circuit and the second differential circuit each include a transistor and are configured such that a drive current for supplying the drive signal flows through the transistor which is common between the first mode and the second mode.

公开(公告)号：US10992127B2

公开(公告)日：2021-04-27

申请号：US16315023

申请日：2017-06-12

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Masahito Sonehara ,  Yoichiro Kobayashi

IPC: H02H3/18 ,  B60R16/033 ,  B60R16/02 ,  H02H1/00 ,  G01R19/165 ,  G01R31/50 ,  G01R31/67

Abstract: There is provided an electronic control unit capable of detecting an abnormality of a dark current while suppressing increase in the size of a circuit. The electronic control unit includes a control unit that operates with a current supplied via a power-supply input terminal from a battery, and a diode arranged on a power supply path connecting the power-supply input terminal with the control unit and serving as a reverse connection protection element that prevents a reverse current when the battery is reversely connected to the power-supply input terminal, and detects an abnormality of a dark current flowing through the diode based on a voltage difference between a voltage on the power-supply input terminal side of the diode and a voltage on the control unit side.