公开(公告)号：US20220103061A1

公开(公告)日：2022-03-31

申请号：US17547840

申请日：2021-12-10

Applicant: DENSO CORPORATION

Inventor： Yasuaki AOKI ,  Tomohiro NEZUKA ,  Akimasa NIWA

IPC: H02M1/38 ,  H02M7/5387 ,  H02M1/08 ,  H03K17/16 ,  H02M1/00 ,  H02P27/06

Abstract: In a drive circuit, a differential circuit unit is configured such that resetting of an output voltage of the differential circuit unit is carried out, and the resetting of the output voltage of the differential circuit unit is cancelled. A value of the difference between first and second divided terminal voltages at a timing of cancelling the resetting is defined as a reference voltage. The differential circuit unit generates, as the output voltage, a product of a voltage change from a reference voltage and a predetermined amplification factor after cancelling of the resetting of the differential circuit unit. A signal generator generates a gate signal for the upper- and lower-arm switches in accordance with a value of the output voltage of the differential circuit unit while the upper- and lower-arm switches are in an off state.

公开(公告)号：US20200021282A1

公开(公告)日：2020-01-16

申请号：US16503725

申请日：2019-07-05

Applicant: DENSO CORPORATION

Inventor： Masahiro YAMAMOTO ,  Akimasa NIWA

IPC: H03K17/00 ,  H03K17/16 ,  H03K17/082

Abstract: A gate drive circuit includes a driver for driving a gate of a switching element, a peak voltage detector, and a drive capacity calculator. The peak voltage detector detects a peak voltage at a main terminal of the switching element when the switching element is OFF. The drive capacity calculator calculates a voltage difference value between the detected peak voltage and an allowable voltage value at the main terminal of the switching element, where the allowable voltage is based on the specifications of the switching element. The drive capacity calculator changes a drive capacity of the driver to gradually decrease the difference between the detected peak voltage and the allowable voltage.

公开(公告)号：US20220109438A1

公开(公告)日：2022-04-07

申请号：US17550887

申请日：2021-12-14

Applicant: DENSO CORPORATION

Inventor： Yuuta NAKAMURA ,  Yasuaki AOKI ,  Hideji YOSHIDA ,  Takashi YOSHIYA ,  Tomohiro NEZUKA ,  Akimasa NIWA

IPC: H03K17/042 ,  H02M1/08 ,  H02M1/00 ,  H02M7/537 ,  H03K17/687

Abstract: A drive circuit drives a switch configuring a power converter. The drive circuit divides an inter-terminal voltage of a switch. The drive circuit includes a differential circuit having first and second input terminals to which the divided inter-terminal voltages are inputted. The differential circuit outputs an analog voltage based on a voltage difference between the input terminals. The differential circuit executes reset of the output voltage, and with the voltage difference when reset is canceled after reset is executed as a reference voltage, outputs an analog voltage in which an amount of change from the reference voltage is multiplied by an amplification factor. The drive circuit outputs a binary signal based on comparison results between a threshold and the analog voltage outputted from the differential circuit, and sets a transfer rate of a gate charge of the switch when a driving state is switched, based on the output signal thereof.

公开(公告)号：US20210258004A1

公开(公告)日：2021-08-19

申请号：US17224749

申请日：2021-04-07

Applicant: DENSO CORPORATION

Inventor： Hironori AKIYAMA ,  Akimasa NIWA ,  Masahiro YAMAMOTO

IPC: H03K17/082 ,  H02M1/08

Abstract: A gate drive apparatus includes a driver, a peak voltage detector and a drive capability controller. The driver drives a gate of a first switching element as one of two switching elements respectively in an upper arm and a lower arm of a half-bridge circuit. The peak voltage detector detects a peak voltage at a second switching element in a situation where the first switching element is turned on. The drive capability controller calculates a value of drive capability when the driver turns on the first switching element, in a condition that the peak voltage at the second switching element does not exceed a tolerance value of a voltage at the second switching element according to a specification of the second switching element, and modifies the drive capability when the driver turns on the first switching element, based on a calculated result of the value of the drive capability.

公开(公告)号：US20210036697A1

公开(公告)日：2021-02-04

申请号：US17072724

申请日：2020-10-16

Applicant: DENSO CORPORATION

Inventor： Masahiro YAMAMOTO ,  Akimasa NIWA

IPC: H03K17/082

Abstract: A gate drive circuit includes a driver for driving a gate of a switching element, a peak voltage detector, and a drive capacity calculator. The peak voltage detector detects a peak voltage at a main terminal of the switching element when the switching element is OFF. The drive capacity calculator calculates a voltage difference value between the detected peak voltage and an allowable voltage value at the main terminal of the switching element, where the allowable voltage is based on the specifications of the switching element. The drive capacity calculator changes a drive capacity of the driver to gradually decrease the difference between the detected peak voltage and the allowable voltage.