公开(公告)号：US20240405711A1

公开(公告)日：2024-12-05

申请号：US18806447

申请日：2024-08-15

Applicant: DENSO CORPORATION

Inventor： Akeru ISHIKAWA ,  Masanori YAMAMURA

IPC: H02P29/024 ,  H02P21/14

Abstract: A signal processing device includes two to N pieces of AD converters provided independently of one another and each having at least one channel to which the sensor signal is input. The signal processing device is configured to calculate a current sum value as a sum of the N pieces of the converted signals corresponding to currents flowing in and out of the connection point with respect to the converted signals output from the AD converters and, when an absolute value of the current sum value is greater than a determination threshold, determine that any of channels of any of the AD converters is abnormal.

公开(公告)号：US20220393572A1

公开(公告)日：2022-12-08

申请号：US17888186

申请日：2022-08-15

Applicant: DENSO CORPORATION

Inventor： Kouichi NISHIBATA ,  Masanori YAMAMURA

IPC: H02M1/36 ,  H02M1/08 ,  H02M7/5387

Abstract: A control circuit for a power converter is applicable to a system that includes a power supply, a power converter, an interruption switch, a smoothing capacitor, and a series-connection body made of a discharge resistor and a discharge switch. In the control circuit, a discharge command unit outputs a discharge command for the smoothing capacitor. A discharge drive command unit outputs a drive command for the discharge switch based on the discharge command outputted from the discharge command unit. A drive circuit is connected to a gate of the discharge switch and performs drive control of the discharge switch based on the drive command outputted from the discharge drive command unit. An operation detecting unit detects a signal related to driving of the drive switch. A discharge determining unit determines whether the discharge drive command unit is normal based on a detected signal of the operation detecting unit.

公开(公告)号：US20220393633A1

公开(公告)日：2022-12-08

申请号：US17888095

申请日：2022-08-15

Applicant: DENSO CORPORATION

Inventor： Kouichi NISHIBATA ,  Akifumi ARARAGI ,  Masanori YAMAMURA

IPC: H02P29/024 ,  H02M7/5387 ,  H02M1/08 ,  H02M1/32 ,  H02P27/06

Abstract: A control circuit is used for a system including a power storage unit, an electric load, and a power converter electrically connected to the electric load. The control circuit includes an abnormality determination unit, an emergency power supply that generates power based on electricity supplied from the power storage unit, and a protective control unit that, when the abnormality determination unit determines that an abnormality has occurred, performs protective control for the system. The emergency power supply includes a power supply control unit configured to be operable based on electricity supplied from the power storage unit. During the period from when the voltage input to the power supply control unit starts increasing based on electricity supplied from the power storage unit, the power supply control unit starts the emergency power supply in response to the input voltage reaching a specified voltage.

公开(公告)号：US20220393568A1

公开(公告)日：2022-12-08

申请号：US17887862

申请日：2022-08-15

Applicant: DENSO CORPORATION

Inventor： Kouichi NISHIBATA ,  Masanori YAMAMURA

IPC: H02M1/084 ,  H02M7/537 ,  H02K11/20 ,  H02P27/06 ,  H02K11/33 ,  H02P29/024

Abstract: In a control circuit for a power converter applicable to a system including a rotary electric machine, a fail-safe controller performs, in response to determination that there is a failure in the system, a short-circuit control routine that turns on predetermined turn-on arm switches, and turns off predetermined turn-off arm switches. The turn-on arm switches bare one of (i) upper-arm switches and (ii) lower-arm switches, and the turn-off arm switches are the other of (i) the upper-arm switches and (ii) the lower-arm switches. An on determiner detects a drive state of each turn-on arm switch upon determination that the turn-on is instructed for the corresponding turn-on arm switch, and determines, based on the drive state of each turn-on arm switch, whether the turn-on arm switches are switchable to be on in preparation for a short-circuit control routine performed by a short-circuit controller.

公开(公告)号：US20200021185A1

公开(公告)日：2020-01-16

申请号：US16508583

申请日：2019-07-11

Applicant: DENSO CORPORATION

Inventor： Masanori YAMAMURA ,  Taro HIRAI

IPC: H02M1/36 ,  H02H1/00 ,  H02M7/5387 ,  H02M1/08

Abstract: In an abnormality determination system, when a drive signal is input and no shutdown signal for stopping gate drive of switching elements is input, a signal switching section outputs the drive signal to a bridge circuit. When a shutdown signal is input, the signal switching section stops output of the drive signal and activates a shutdown function of an inverter. An abnormality determination section determines an abnormality in the shutdown function. When a power source relay is opened, a control unit drives the bridge circuit to start a discharge process of discharging electric charge from a smoothing capacitor, and activates the shutdown function during execution of the discharge process. When it is determined that a directly or indirectly detected voltage of the smoothing capacitor has dropped during operation of the shutdown function, the abnormality determination section determines that the shutdown function is abnormal.