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公开(公告)号：US11750086B2
公开(公告)日：2023-09-05
申请号：US17547840
申请日：2021-12-10
Applicant: DENSO CORPORATION
Inventor： Yasuaki Aoki , Tomohiro Nezuka , Akimasa Niwa
CPC classification number: H02M1/385 , H02M1/08 , H02M7/53871 , H03K17/165 , H02M1/0054 , H02P27/06 , H03K2217/0063 , H03K2217/0072
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.
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公开(公告)号：US10979039B2
公开(公告)日：2021-04-13
申请号：US16503725
申请日：2019-07-05
Applicant: DENSO CORPORATION
Inventor： Masahiro Yamamoto , Akimasa Niwa
IPC: H03K17/00 , H03K17/082 , H03K17/16
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.
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公开(公告)号：US11855618B2
公开(公告)日：2023-12-26
申请号：US17953456
申请日：2022-09-27
Inventor： Hironori Akiyama , Akimasa Niwa
IPC: H03K17/00 , H03K17/687 , H03K17/284 , H03K17/94 , H03K17/06 , H03K17/16 , H03K17/0812 , H03K17/042 , H03K17/081
CPC classification number: H03K17/687 , H03K17/04206 , H03K17/063 , H03K17/08104 , H03K17/08122 , H03K17/16 , H03K17/284 , H03K17/94
Abstract: A gate drive device drives a gate of a semiconductor switching element and controls a transient voltage corresponding to a voltage of a main terminal of the semiconductor switching element to a target value of the transient voltage at a time of switching the semiconductor switching element. The gate drive device includes a calculation circuit, a drive circuit, a detection circuit, and a learning circuit. The calculation circuit executes a predetermined calculation mode to calculate an operation amount for operating gate drive speed of the semiconductor switching element. The drive circuit drives the gate of the semiconductor switching element according to the operation amount. The detection circuit detects the transient voltage. The learning circuit executes learning processing to change the predetermined calculation mode based on the operation amount calculated by the calculation circuit and the transient voltage detected by the detection circuit.
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Patent Agency Ranking
公开(公告)号：US11431332B2
公开(公告)日：2022-08-30
申请号：US17072724
申请日：2020-10-16
Applicant: DENSO CORPORATION
Inventor： Masahiro Yamamoto , Akimasa Niwa
IPC: H03K17/082 , H03K17/08
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.
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公开(公告)号：US12174266B2
公开(公告)日：2024-12-24
申请号：US17732819
申请日：2022-04-29
Inventor： Junichi Hasegawa , Akimasa Niwa
IPC: G01R31/52 , H03K17/082
Abstract: A circuit for detecting a leakage current in a semiconductor element includes a setting circuit and a detector. The semiconductor element includes a first terminal at a high-potential-side of the semiconductor element, a second terminal at a low-potential-side of the semiconductor element, and a control terminal. The control terminal receives a signal for controlling a conduction state between the first terminal and the second terminal. The setting circuit sets a duration during which a charging current flows to the control terminal as an undetectable duration, in response to turning on the semiconductor element. The detector outputs a detected signal based on a condition that the leakage current flowing from the control terminal to the second terminal, after the undetectable duration has been elapsed.
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公开(公告)号：US11283438B2
公开(公告)日：2022-03-22
申请号：US17224749
申请日：2021-04-07
Applicant: DENSO CORPORATION
Inventor： Hironori Akiyama , Akimasa Niwa , Masahiro Yamamoto
IPC: H03K3/00 , H03K17/00 , H03K17/082 , H03K17/16 , 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.
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公开(公告)号：US12034438B2
公开(公告)日：2024-07-09
申请号：US17747198
申请日：2022-05-18
Applicant: DENSO CORPORATION
Inventor： Masahiro Yamamoto , Akimasa Niwa
IPC: H03K17/687 , H03K17/00 , H03K17/081 , H03K17/082 , H03K17/18
CPC classification number: H03K17/687 , H03K17/002 , H03K17/08104 , H03K17/0822 , H03K17/18 , H01L2924/19041 , H03K2217/0054
Abstract: A signal detection circuit includes: a voltage dividing circuit having at least a first pair of voltage dividing capacitors connected in series for dividing an input voltage and configured to output a divided voltage, and a detection circuit configured to detect the divided voltage. The first pair of voltage dividing capacitors are included in one semiconductor device. The semiconductor device includes: (i) a semiconductor substrate, (ii) a first conductor layer, (iii) a first dielectric layer, (iv) a second conductor layer, (v) a second dielectric layer, (vi) a third conductor layer, and (vii) a short-circuit portion configured to short-circuit the first conductor layer and the semiconductor substrate.
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公开(公告)号：US11831302B2
公开(公告)日：2023-11-28
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
CPC classification number: H03K17/04206 , H02M1/0009 , H02M1/08 , 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.
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