公开(公告)号：US20170201201A1

公开(公告)日：2017-07-13

申请号：US15394165

申请日：2016-12-29

Applicant: DENSO CORPORATION

Inventor： Yasuaki AOKI ,  Yosuke MATSUKI ,  Hideji YOSHIDA

IPC: H02P21/22 ,  G01R1/20 ,  G01R19/00 ,  H02P27/08 ,  H02P6/16

CPC classification number: H02P21/22 ,  G01R1/203 ,  G01R19/0092 ,  H02P6/16 ,  H02P21/14 ,  H02P21/34 ,  H02P27/08 ,  H02P29/60 ,  H02P2205/01 ,  H02P2207/05

Abstract: In a current detection apparatus, an arm current detection unit detects each of at least first and second phase currents having respective amplitudes and flowing in a multiphase rotary electric machine based on a potential difference between input and output terminals of the corresponding one of first and second detection switches during the corresponding one of the first and second detection switches being on. A bus current detection unit detects each of at least bus-based first and second phase currents corresponding to the first and second phases of the multiphase rotary electric machine based on a current flowing through one of first and second buses. An amplitude correction unit corrects the first and second phase currents based on the bus-based first and second phase currents such that the amplitudes of the respective first and second phase currents match with each other.

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.