公开(公告)号：US10291110B2

公开(公告)日：2019-05-14

申请号：US15490390

申请日：2017-04-18

Applicant: DENSO CORPORATION

Inventor： Kazunori Watanabe ,  Tomotaka Suzuki ,  Tomoyuki Muraho ,  Yoshinori Hayashi

IPC: H03K3/00 ,  H02M1/088 ,  H02M7/5387 ,  H03K17/04 ,  H03K17/0412 ,  H03K17/687 ,  H02M1/00 ,  H02P27/08 ,  H03K17/12

Abstract: In a drive circuit, a rate adjuster adjusts a charging speed of a MOSFET to be faster than the charging speed of an IGBT when a drive state changer changes the first switching element from the off state to the on state first, and changes the second switching element from the off state to the on state next. The rate adjuster also adjusts a discharging speed of the MOSFET to be faster than the discharging speed of the IGBT when the drive state changer changes the MOSFET from the on state to the off state first, and changes the IGBT from the on state to the off state next.

公开(公告)号：US11848599B2

公开(公告)日：2023-12-19

申请号：US16840985

申请日：2020-04-06

Applicant: DENSO CORPORATION

Inventor： Mitsunori Kimura ,  Yoshinori Hayashi ,  Kengo Mochiki

IPC: H02M1/08 ,  H03K17/0814 ,  H03K17/082 ,  H03K17/284 ,  H03K17/687 ,  H02M1/00

CPC classification number: H02M1/08 ,  H03K17/0822 ,  H03K17/08142 ,  H03K17/284 ,  H03K17/687 ,  H02M1/0009

Abstract: A drive circuit for a switch drives an upper-arm switch and a lower-arm switch that include body diodes. Of the body diodes in upper- and lower-arm switches, the diode through which a feedback current flows during a dead time is a target diode. Of the upper- and lower-arm switches, the switch that includes the target diode is a target switch. The remaining switch is an opposing arm switch. The drive circuit maintains an electric potential of a control terminal relative to a second terminal of the target switch at a negative voltage over a period from a timing subsequent to a start timing of a dead time immediately after the target switch is switched to an off-state until a point within a period over which the opposing arm switch is set to an on-state, and subsequently maintains the electric potential at an off-voltage until a next dead time is ended.

公开(公告)号：US10170978B1

公开(公告)日：2019-01-01

申请号：US16061253

申请日：2016-12-08

Applicant: DENSO CORPORATION

Inventor： Yoshinori Hayashi ,  Tomotaka Suzuki

IPC: H02M1/092 ,  H02M7/5387 ,  H02M1/44 ,  H02M1/088 ,  H02M7/00 ,  H02P27/08

Abstract: In a signal transmission circuit including a drive circuit and a control apparatus which are insulated from each other and between which a signal indicative of predetermined information is transmitted via a magnetic coupler, the drive circuit includes a temperature information transmission unit transmitting a first signal indicative of temperature information based on the number of pulses consecutively output with a predetermined period and each having a first waveform with a duty cycle of less than 100% with respect to the period and an abnormality information transmission unit transmitting a second signal indicative of abnormality information based on a pulse having a longer wavelength than the first waveform. The temperature information transmission unit transmits the first signal to the control apparatus and the abnormality information transmission unit transmits the second signal to the control apparatus, via the magnetic coupler common to two information transmission units.

公开(公告)号：US20240267039A1

公开(公告)日：2024-08-08

申请号：US18639361

申请日：2024-04-18

Applicant: DENSO CORPORATION

Inventor： Atsuki Asano ,  Yoshinori Hayashi

IPC: H03K17/0814 ,  H02P27/06 ,  H03K17/16

CPC classification number: H03K17/08142 ,  H02P27/06 ,  H03K17/162 ,  H03K2217/0027

Abstract: A switch overcurrent measuring apparatus includes an electrical path with a first end connecting with a high potential terminal of a pair of major terminals of a target-driven switch, a diode arranged in the electrical path to have a cathode facing the high potential terminal, and an overcurrent measuring device which connects with a second end of the electrical path. After a command for the switch is changed to an ON-command, the device measures voltage developed between the terminals. When the voltage is higher than an overcurrent threshold, the device determines that an overcurrent is flowing. A damping device arranged in the electrical path has a property that an impedance thereof at a given frequency band is higher than that in a frequency band outside. The given frequency band includes a ringing frequency band of voltage which appears between the terminals and arises from switching between operating states.

公开(公告)号：US10103646B2

公开(公告)日：2018-10-16

申请号：US15274467

申请日：2016-09-23

Applicant: DENSO CORPORATION

Inventor： Yoshinori Hayashi ,  Tomotaka Suzuki

IPC: H02M7/5387 ,  H02M3/158 ,  H02M1/088 ,  H02M1/00

Abstract: In a control device, a load determiner determines whether a power converter is in a high-load state or a low-load state. A high-load controller controls on-off operations of the first rectifiers such that on durations of the first rectifiers are respectively synchronized with each other when it is determined that the power converter is in the high-load state. A low-load controller controls on-off operations of the first rectifiers to reduce the on durations of the first rectifies synchronized with each other when it is determined that the power converter is in the low-load state.

公开(公告)号：US09434217B2

公开(公告)日：2016-09-06

申请号：US14419767

申请日：2013-08-01

Applicant: DENSO CORPORATION ,  PACIFIC INDUSTRIAL CO., LTD.

Inventor： Masashi Mori ,  Takatoshi Sekizawa ,  Yoshinori Hayashi ,  Takao Araya

IPC: G01L17/00 ,  B60C23/04 ,  G01M17/013 ,  G01V7/04

CPC classification number: B60C23/0489 ,  B60C23/0416 ,  B60C23/0462 ,  B60C23/0488 ,  G01L17/00 ,  G01M17/013 ,  G01V7/04

Abstract: In a wheel position detection apparatus, a first controlling section of a transmitter repeatedly transmits a frame including specific identification information at a timing when an angle of the transmitter is at a predetermined angle. A second control unit of a receiver receives the frame transmitted from the transmitter, and identifies which of a plurality of wheels the transmitter that has transmitted the frame is attached to. The receiver changes an allowable range of variability in accordance with a road surface condition indicated by a degree of road surface roughness every time the frame is received, and sets the allowable range of variability wider for a road surface that is rough than for a road surface that is not rough.

Abstract translation: 在车轮位置检测装置中，发射机的角度为规定角度的定时，发射机的第一控制部重复发送包含特定识别信息的帧。 接收机的第二控制单元接收从发射机发送的帧，并且识别发送帧的发射机附着到多个车轮中的哪一个。 接收器根据每次接收到帧时的路面粗糙度表示的路面条件改变容许的变异范围，并且将路面粗糙的路面的可变性的允许范围设定为比路面粗糙的路面宽 那不是粗糙的

公开(公告)号：US10855269B2

公开(公告)日：2020-12-01

申请号：US16351945

申请日：2019-03-13

Applicant: DENSO CORPORATION

Inventor： Kengo Mochiki ,  Mitsunori Kimura ,  Yoshinori Hayashi

IPC: H03K17/082 ,  H02P27/06 ,  H02M7/5387 ,  H02M1/08

Abstract: In a drive circuit, one of an upper-arm switch and a lower-arm switch being in an on state by a main driver is referred to as a target arm switch. The other of the upper-arm switch and the lower-arm switch being in an off state by the main driver is referred to as an opposite arm switch. An intrinsic diode connected in antiparallel to the opposite arm switch is referred to as an opposite arm diode. The drive circuit includes a protective driver configured to determine whether a failure has occurred in the target arm switch. The protective driver is configured to change the target arm switch from the on state to the off state, and the opposite arm switch from the off state to the on state upon determining that a failure has occurred in the target arm switch.

公开(公告)号：US10720912B2

公开(公告)日：2020-07-21

申请号：US16406299

申请日：2019-05-08

Applicant: DENSO CORPORATION

Inventor： Yoshinori Hayashi

IPC: H03K17/0812 ,  H02M3/158 ,  H02M7/5387 ,  H02M1/08 ,  H02P27/08

Abstract: A suppressing circuit is provided with a diode of which an anode is connected to a first neutral point between a drive circuit and a control electrode of a semiconductor switch; a capacitor disposed between a cathode of the diode and a reference potential; a constant voltage circuit connected to a second neutral point between the diode and the capacitor; an adjusting resistor disposed between the constant voltage circuit and the second neutral point; and a cutoff switch disposed between a constant voltage circuit side of the adjusting resistor and the reference potential.

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：US10090832B2

公开(公告)日：2018-10-02

申请号：US15003878

申请日：2016-01-22

Applicant: DENSO CORPORATION

Inventor： Yoshinori Hayashi ,  Tomotaka Suzuki

IPC: H02M1/08 ,  H03K17/16 ,  G01K7/01 ,  H02M1/088 ,  H02M7/5387 ,  H03K17/12 ,  H02M7/501 ,  H02M7/48 ,  H02M7/497 ,  H02M1/00 ,  H03K17/08

Abstract: In a controller for applying a first drive voltage signal to one of parallel-connected first and second switching elements to perform a predetermined switching operation of one of the first switching element and the second switching element according to change of a first drive voltage in one of the first and second switching elements, a voltage detector detects the first drive voltage of one of the first and second switching elements. A delaying unit delays an application of a second drive voltage signal to the other of the first switching element and the second switching element to perform the predetermined operation of the other of the first switching element and the second switching element according to change of a second drive voltage in the other thereof while the first drive voltage in one of the first and second switching elements is substantially a predetermined Miller voltage.