公开(公告)号：US09900000B2

公开(公告)日：2018-02-20

申请号：US15117487

申请日：2015-03-12

Applicant: DENSO CORPORATION

Inventor： Atsushi Kanamori ,  Sadahiro Akama ,  Kiyoshi Yamamoto ,  Atsushi Kobayashi

IPC: H03K17/14 ,  H03K17/16 ,  H03K17/28

CPC classification number: H03K17/14 ,  H03K17/165 ,  H03K17/168 ,  H03K17/28

Abstract: A drive device for controlling a power switching element to turn on and off includes: an on-side circuit performing an on operation of the power switching element; an off-side circuit performing an off operation of the power switching element; and a temperature detector detecting a temperature. At least one of the on-side and off-side circuits includes a current path for supplying or drawing a gate current of the power switching element and a switch circuit for switching the gate current. The switch circuit transitionally changes the gate current based on the temperature of the power switching element when the switching circuit switches the gate current.

公开(公告)号：US09979384B2

公开(公告)日：2018-05-22

申请号：US15122438

申请日：2015-04-02

Applicant: DENSO CORPORATION

Inventor： Atsushi Kobayashi ,  Kiyoshi Yamamoto ,  Atsushi Kanamori ,  Sadahiro Akama

IPC: H03K19/00 ,  H03K17/16 ,  H03K3/012 ,  H03K5/1534 ,  H03K17/28

CPC classification number: H03K17/162 ,  G11C29/023 ,  G11C29/028 ,  H03K3/012 ,  H03K5/1534 ,  H03K17/163 ,  H03K17/168 ,  H03K17/28 ,  H03K2005/00065 ,  H03K2005/00247 ,  H03K2005/00273

Abstract: A timing adjustment method for a drive circuit, including: a rise detector for a rise start when a voltage-driven semiconductor element is turned off; a timing signal output unit outputting a speed change timing signal after a set delay time has elapsed from the rise start; and a conduction controller for a conduction control terminal of the semiconductor element using the timing signal, comprises: defining an estimated terminal voltage of the conduction control terminal when a rise completion time elapses; increasing a delay time by a predetermined unit time, and changing the drive signal to a turning off level again, when the conduction control terminal doesn't fall below the estimated terminal voltage after the drive signal is changed to a turning off level before the level is inverted; and determining a delay time, when the conduction control terminal falls below the estimated terminal voltage initially, as a set value.

公开(公告)号：US09800237B2

公开(公告)日：2017-10-24

申请号：US15117512

申请日：2015-03-12

Applicant: DENSO CORPORATION

Inventor： Sadahiro Akama ,  Kiyoshi Yamamoto ,  Atsushi Kobayashi ,  Atsushi Kanamori

IPC: G05F1/565 ,  H03K17/567 ,  H03K17/04 ,  H03K17/16 ,  H03K17/687

CPC classification number: H03K17/0406 ,  G05F1/565 ,  H03K17/167 ,  H03K17/567 ,  H03K17/6871

Abstract: A drive device for controlling a power switching element includes: an on-side circuit that performs an on operation of the power switching element; and an off-side circuit that performs an off operation of the power switching element. The on-side circuit or the off-side circuit includes: multiple main MOS transistors; a sense MOS transistor that define a drain current of each main MOS transistor; and a sense current control circuit that controls a drain current of the sense MOS transistor to be constant; and a switch circuit that is connected to the gate of each main MOS transistor, and controls each main MOS transistor to turn on and off so as to switch a gate current in the power switching element.