公开(公告)号：US11385297B2

公开(公告)日：2022-07-12

申请号：US16654222

申请日：2019-10-16

Applicant: DENSO CORPORATION

Inventor： Toru Wakimoto ,  Yusuke Shindo ,  Masakazu Kouda

IPC: G01R31/50 ,  G01R31/42 ,  G01R31/52

Abstract: An electrical leakage determination system determines if an electrical leakage occurs between each of power supply paths and a grounding section. The electrical leakage determination system includes a coupling capacitor with one end connected to an anode-side power supply path, a resistor connected to the other end of the coupling capacitor, and an oscillator connected to the resistor to output an AC voltage to the resistor. A determiner detects a voltage at a connection point located between the coupling capacitor and the resistor when the oscillator outputs an AC voltage to the resistor. The determiner determines if the electrical leakage occurs based on the detected voltage. The oscillator increases an absolute value of an AC voltage output during a preparation period provided prior to a detection timing when a voltage is detected at a connection point greater than an absolute value of an AC voltage output at the detection timing.

公开(公告)号：US09742324B2

公开(公告)日：2017-08-22

申请号：US15016923

申请日：2016-02-05

Applicant: DENSO CORPORATION

Inventor： Junichi Fukuta ,  Koichi Nishibata ,  Hiroya Tsuji ,  Yusuke Shindo ,  Shinichiro Nakata ,  Yasutaka Senda

IPC: H02H7/08 ,  H02P6/16 ,  H02P29/028

CPC classification number: H02P6/16 ,  H02P29/028 ,  H02P29/032

Abstract: In an integrated circuit formed into a single chip, a drive signal generating unit generates drive signals for switching elements of a power conversion circuit. A monitoring unit monitors a microcomputer that calculates generation information that is information used to generate the drive signals, and determines whether or not an abnormality has occurred in the microcomputer. An angle converting unit converts an output signal of an angle sensor to rotation angle information of a rotating electric machine. A drive signal generating unit generates the drive signals for controlling driving of the rotating electric machine based on the generation information and the rotation angle information when the monitoring unit determines that an abnormality has not occurred in the microcomputer, and generates the drive signals based on the rotation angle information, without using the generation information, when the monitoring unit determines that an abnormality has occurred in the microcomputer.

公开(公告)号：US11874339B2

公开(公告)日：2024-01-16

申请号：US17337957

申请日：2021-06-03

Applicant: DENSO CORPORATION

Inventor： Ryota Kubokawa ,  Masakazu Kouda ,  Toru Wakimoto ,  Yusuke Shindo ,  Akira Sumi

IPC: G01R31/52 ,  G01R27/18

CPC classification number: G01R31/52 ,  G01R27/18

Abstract: In an insulation resistance detection apparatus, a voltage determiner determines whether a detection voltage, which has changed by at least a preset value, becomes stable at around a changed voltage value. A resistance determiner determines a value of an insulation resistance between a ground portion and a power-supply path based on a currently sampled value of the detection voltage instead of a moving average in response to determination that the detection voltage, which has changed by at least the preset value, becomes stable at around the changed voltage value.

公开(公告)号：US09724999B2

公开(公告)日：2017-08-08

申请号：US14495128

申请日：2014-09-24

Applicant: DENSO CORPORATION

Inventor： Syun Miyauchi ,  Tsuneo Maebara ,  Yusuke Shindo ,  Junichi Fukuta

IPC: H03K17/691 ,  B60L11/18 ,  B60L15/00 ,  H03K17/61 ,  H02M7/00

CPC classification number: B60L11/1803 ,  B60L11/1864 ,  B60L15/007 ,  H02M7/003 ,  H03K17/61 ,  H03K17/691 ,  Y02T10/645 ,  Y02T10/7005 ,  Y02T10/7061

Abstract: Upper arm connection sections and lower arm connection sections are provided in parallel. An upper arm transformer and a power supply are provided in an area opposed to the lower arm connection sections with respect to the upper arm connection sections. A power supply control section is provided in at least one of an area opposed to the upper arm connection sections with respect to the upper arm transformer, and an area which is sandwiched between at least one of the upper and lower connection sections closest to one side of the substrate positioned in a direction in which the upper arm connection sections are arranged, and the one side. The lower arm transformer is provided in an area opposed to the upper arm connection sections with respect to the lower arm connection sections. The lower arm transformer is common to at least two of the lower arm switching elements.

公开(公告)号：US11163014B2

公开(公告)日：2021-11-02

申请号：US16591764

申请日：2019-10-03

Applicant: DENSO CORPORATION

Inventor： Toru Wakimoto ,  Yusuke Shindo ,  Masakazu Kouda

IPC: G01R31/50 ,  G01R31/40

Abstract: An electrical leakage determination system that determines if an electrical leakage occurs includes a capacitor having first and second ends connected to a cathode side power supply path and a grounding section and a switch disposed in an electrical path formed parallel to the capacitor. When the capacitor discharges and a predetermined period has elapsed after the controller sets an energized state between the cathode-side power supply path and the grounding section by bringing the switch to an energizing position, the controller allows the capacitor to charge by setting an energization shut down state between the cathode-side power supply path and the grounding section by bringing the switch to an energization shut down position. The controller subsequently detects a voltage value of the capacitor and determines if the electrical leakage is either present or absent based on the voltage value.

公开(公告)号：US10742210B2

公开(公告)日：2020-08-11

申请号：US16592870

申请日：2019-10-04

Applicant: DENSO CORPORATION

Inventor： Tomotaka Suzuki ,  Yusuke Shindo ,  Yasutaka Senda ,  Ken Toshiyuki

IPC: H03K17/687

Abstract: A drive circuit drives switches that are connected to each other in parallel. The drive circuit includes individual discharge paths, a common discharge path, blocking units, a discharge switch, off-holding switches, and a drive control unit. The drive control unit selects, as target switches to be driven to be turned on, at least two switches among the switches. The at least two switches include a first switch and a second switch. The first switch is last to be switched to an off-state among the at least two switches that are selected as the target switches and switched to an on-state. The second switch is other than the first switch among the at least two switches. The off-holding switches includes a first off-holding switch and a second off-holding switch. After switching the second off-holding switch to an on-state, the drive control unit switches the discharge switch to an on-state.

公开(公告)号：US10461736B2

公开(公告)日：2019-10-29

申请号：US16278337

申请日：2019-02-18

Applicant: DENSO CORPORATION

Inventor： Yoshitaka Kato ,  Kenji Komiya ,  Yusuke Shindo ,  Yoshinori Hayashi ,  Kenichi Wakabayashi

IPC: H03K17/16 ,  H02M1/08 ,  H02M1/32 ,  H02M7/537 ,  H02M3/158 ,  H02M7/5387 ,  H02M1/00

Abstract: A semiconductor device turns on and off a power switching device having a gate terminal and output terminals between which an output current is produced by a gate voltage applied to the gate terminal. The semiconductor device includes: an output current detector detecting a current value correlated with the output current; a voltage detector detecting a voltage across the output terminals of the power switching device; a clamp circuit clamping the gate voltage at a predetermined value; and a controller controlling the clamp circuit to adjust the gate voltage based on the voltage detected by the voltage detector. The controller controls the clamp circuit to set the gate voltage to be at a minimum voltage according to the detected voltage to cause the output current to be larger than a threshold current required for detecting the short circuit in the power switching device.

公开(公告)号：US10256330B2

公开(公告)日：2019-04-09

申请号：US15824578

申请日：2017-11-28

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  DENSO CORPORATION

Inventor： Ken Toshiyuki ,  Yusuke Shindo ,  Tomotaka Suzuki

IPC: H01L29/739 ,  H03K17/082 ,  H03K17/12 ,  H01L27/088 ,  H01L29/06 ,  H03K17/16

Abstract: A switching circuit may be provided with: a parallel circuit including a first IGBT and a second IGBT connected in parallel; a controller configured to receive a signal indicating a turn-on timing and a turn-off timing. The controller is configured to: turn on both of the first and second IGBTs at the turn-on timing, execute a first control in which one of the first and second IGBTs is turned off before the turn-off timing and the other of the first and second IGBTs is turned off at the turn-off timing in a case where current flowing through the parallel circuit is equal to or lower than a threshold value, and execute a second control in which both of the first and second IGBTs are turned off at the turn-off timing in a case where the current flowing through the parallel circuit is higher than the threshold value.

公开(公告)号：US11921138B2

公开(公告)日：2024-03-05

申请号：US17340906

申请日：2021-06-07

Applicant: DENSO CORPORATION

Inventor： Masakazu Kouda ,  Ryota Kubokawa ,  Yusuke Shindo ,  Toru Wakimoto

IPC: G01R27/02 ,  B60L3/00 ,  G01R27/18 ,  G01R31/52

CPC classification number: G01R27/025 ,  B60L3/0046 ,  G01R27/18 ,  G01R31/52

Abstract: An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.

公开(公告)号：US10374509B2

公开(公告)日：2019-08-06

申请号：US16194903

申请日：2018-11-19

Applicant: DENSO CORPORATION ,  TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Koichi Nishibata ,  Yusuke Shindo ,  Tomohisa Ose ,  Junichi Fukuta ,  Yasuhiro Terao ,  Eiichiro Shigehara ,  Keisuke Hata

IPC: H02M1/32 ,  H02H7/122 ,  H02P27/06 ,  H02P29/024 ,  H02H1/00 ,  H02M7/5387

Abstract: In a control circuit for controlling a power converter that includes a switch, a power supply circuit outputs electrical power, and a command generator generates a switching command that controls switching operations of the switch, based on the electrical power output from the power supply circuit. A failure mode determiner executes a determination of whether which of failure modes has occurred in the power supply circuit, and outputs a result of the determination. A switch controller selectively executes, based on the result of the determination, a first switch control task and a second switch control task. The first switch control task forcibly shuts down the switch independently of the switching command, and the second switch control task enables the switching operations of the switch to be continuously controlled based on the switching command.