公开(公告)号：US20180102649A1

公开(公告)日：2018-04-12

申请号：US15730120

申请日：2017-10-11

Applicant: DENSO CORPORATION

Inventor： Tetsuya DEWA

IPC: H02J3/14

CPC classification number: H02J3/14 ,  H02J7/0065 ,  H02M1/088 ,  H02M7/219 ,  H02M7/53875 ,  H02M7/5395

Abstract: A drive circuit drives a plurality of switching elements connected in parallel to each other. The drive circuit includes an operating unit that performs first and second switching processes. In the first switching process, under a condition that a first current detection value acquired before next time an on-command is received is determined to fall below a first threshold that is equal to or less than a threshold current, an on-operation target that is used the next time the on-command is received is set to a second switching element. In the second switching process, under a condition that the second current detection value acquired before the next time the on-command is received is determined to exceed a second threshold that is equal to or greater than the threshold current, the on-operation target that is used the next time the on-command is received is set to a first switching element.

公开(公告)号：US20220416782A1

公开(公告)日：2022-12-29

申请号：US17898578

申请日：2022-08-30

Applicant: DENSO CORPORATION

Inventor： Hironori AKIYAMA ,  Tetsuya DEWA

IPC: H03K17/687 ,  H02M1/08 ,  H03K17/16 ,  H03K17/284 ,  H02M1/00

Abstract: A gate drive device drives a gate of each of two semiconductor switching elements constituting upper and lower arms of a half bridge circuit. The gate drive device detects a peak value of an element voltage that is a voltage of a main terminal of one of the two semiconductor switching elements, as one semiconductor switching element, or a change rate of the element voltage during a change period in which the element voltage changes. The gate drive device determines whether an energization to the one semiconductor switching element during the change period is a forward energization in which a current flows in a forward direction or a reverse energization in which the current flows in a reverse direction.

公开(公告)号：US20180019739A1

公开(公告)日：2018-01-18

申请号：US15643863

申请日：2017-07-07

Applicant: DENSO CORPORATION

Inventor： Yohei KONDO ,  Tetsuya DEWA ,  Noriyuki TAKAGI

IPC: H03K17/04 ,  H02P6/14

CPC classification number: H03K17/0406 ,  H02M7/5387 ,  H03K17/042

Abstract: The drive circuit for driving voltage controlled switches includes: charge path connected to gate of the switch, through which gate charge current flows to turn the switch ON; discharge path connected to the gate and output terminal of the switch, through which gate discharge current flows to turn the switch OFF; and at least either, a charging side element disposed on charging side loop path having the gate, a part of the charge path and the output terminal, restricting current flow to be in one direction and not disturbing current flow of charge current; or a discharging side element disposed on a discharging side loop path having the gate, a part of the discharge path and the output terminal, restricting a current flow to be in one direction and not disturbing a current flow of discharge current.

公开(公告)号：US20220407511A1

公开(公告)日：2022-12-22

申请号：US17898557

申请日：2022-08-30

Applicant: DENSO CORPORATION

Inventor： Hironori AKIYAMA ,  Tetsuya DEWA

IPC: H03K17/687 ,  H02M1/08 ,  H03K17/16 ,  H03K17/284

Abstract: A gate drive device drives a gate of a semiconductor switching element constituting an upper or lower arm of a half bridge circuit which supplies an output current, which is alternating current, to a load. The gate drive device detects a peak value of an element voltage which is a voltage of a main terminal of the semiconductor switching element or a change rate of the element voltage when the semiconductor switching element is switching. The gate drive device acquires a maximum value among a plurality of peak values or a plurality of change rates during a predetermined detection period including a period in which the semiconductor switching element performs switching multiple number of times.

公开(公告)号：US20190243715A1

公开(公告)日：2019-08-08

申请号：US16267662

申请日：2019-02-05

Applicant: DENSO CORPORATION

Inventor： Tetsuya DEWA ,  Yosuke ASAKO ,  Tomotaka SUZUKI ,  Kazunori WATANABE ,  Yohei KONDO ,  Junji MIYACHI

IPC: G06F11/14 ,  H03K17/94 ,  H03K7/08 ,  H03K3/017

Abstract: In a drive apparatus, a transmission unit mounted to a first region stops transmission of a pulse signal from a physical-quantity transmission terminal. The transmission unit transmits, from the failure information transmission terminal, a first signal indicative of an occurrence of the failure associated with the target switch when it is determined that the failure associated with the target switch has occurred, and transmits, from the physical-quantity transmission terminal, a second signal indicative of a content of the failure associated with the target switch. A controller mounted to a second region electrically isolated from the first region detects, based on the pulse signal from the physical-quantity transmission terminal, the physical quantity upon no input of the first signal to the controller. The controller identifies, based on the second signal transmitted from the physical-quantity transmission terminal, the content of the failure upon the first signal being input to the controller.