公开(公告)号：US20240195324A1

公开(公告)日：2024-06-13

申请号：US18584810

申请日：2024-02-22

Applicant: DENSO CORPORATION

Inventor： KUNIHIKO MATSUDA

IPC: H02M7/5387 ,  H02H7/122 ,  H02P27/06

CPC classification number: H02M7/53871 ,  H02H7/122 ,  H02P27/06

Abstract: A power supply apparatus includes a power converter, pull-up and pull-down resistors, a reverse-connection protective relay, a controller, and a dark current cut switch. The power converter includes upper-arm and lower-arm switching elements being connected in series between a power supply line and a ground line, and converts a DC power of a battery and supplies the converted DC power to a load. The pull-up resistor is connected between the power supply line and a common connection node between the upper-arm and lower-arm switching elements, and the pull-down resistor is connected between the common connection node and a ground. The reverse-connection protective relay cuts off a current from the power converter to the battery. The controller controls the power converter and the reverse-connection protective relay. The dark current cut switch cuts off a dark current flowing to the ground through the pull-up resistor and the pull-down resistor.

公开(公告)号：US20240266849A1

公开(公告)日：2024-08-08

申请号：US18620694

申请日：2024-03-28

Applicant: DENSO CORPORATION

Inventor： KUNIHIKO MATSUDA

IPC: H02J7/00 ,  H02P27/06

CPC classification number: H02J7/0034 ,  H02J7/0047 ,  H02J7/0063 ,  H02J2207/20 ,  H02P27/06

Abstract: A reverse connection protection relay of a power supply device is provided in a power supply line between a battery and an input capacitor and is parallel connected with a diode that allows current flow from a battery side to a power converter side, and interrupts the current flow from the power converter side to the battery side when the protection relay is turned off. At a time of initial check, a booster circuit performs an overboost process in which a target voltage is temporarily raised above a value during normal operation. A precharge circuit applies a boosted voltage to an electrode on a high potential side of the input capacitor. A monitoring circuit detects an abnormal due to being stuck in an ON state or in an OFF state of the protection relay according to a post-relay voltage that is a voltage on the inverter side of the protection relay.

公开(公告)号：US20240313523A1

公开(公告)日：2024-09-19

申请号：US18670477

申请日：2024-05-21

Applicant: DENSO CORPORATION

Inventor： KUNIHIKO MATSUDA

IPC: H02H7/122 ,  H02M7/5387 ,  H02P27/06

CPC classification number: H02H7/1227 ,  H02M7/53873 ,  H02P27/06

Abstract: A monitoring voltage output unit outputs a monitoring voltage that has a positive correlation with the current flowing through a shunt resistor connected in series with an upper arm element and a lower arm element of each phase. A monitoring circuit monitors an inverter overcurrent abnormality due to an upper arm element or a lower arm element of one or more phases being stuck in an ON state based on the monitoring voltage. A comparator of the monitoring circuit outputs an overcurrent flag of a pulse signal when the monitoring voltage is larger than a reference value. A determination unit determines that an inverter overcurrent is abnormal and stop energization of an inverter, when a cumulative output time of the overcurrent flag of at least one phase reaches a time threshold or when number of outputs of the overcurrent flag reaches a number threshold.

公开(公告)号：US20230079227A1

公开(公告)日：2023-03-16

申请号：US18053695

申请日：2022-11-08

Applicant: DENSO CORPORATION

Inventor： TAKASHI SUZUKI ,  HIDEKI KABUNE ,  TOSHIHIRO FUJITA ,  KUNIHIKO MATSUDA ,  HARUKI AMANO

IPC: B62D5/04

Abstract: A first circuit energizes a steering assist actuator to electrically assist steering of a driver. A second circuit is provided in a same housing as the first circuit and energizes a positional actuator to move a steering position. A controller operates the first and second circuits to control operations of the steering assist actuator and the positional actuator. The controller changes a priority between the first circuit and the second circuit in a start period, in which the steering control device is started, a normal operation period, in which the steering control device is operated normally, and a stop period, in which the steering control device is stopped. The priority includes at least one of an order of operating the first circuit and the second circuit, output allocation between the first circuit and the second circuit, and output magnitude between the first circuit and the second circuit.