公开(公告)号：US10461650B2

公开(公告)日：2019-10-29

申请号：US16292709

申请日：2019-03-05

Applicant: DENSO CORPORATION

Inventor： Kenji Tomita ,  Seiji Iyasu ,  Yuichi Handa

IPC: H02M3/335 ,  H02M1/08

Abstract: In a control device applied to an insulated DC-DC converter including a transformer and drive switches connected to a input winding of the transformer, the control device operates the drive switches to control an output voltage output via the output winding to a target voltage. Furthermore, the control device includes a voltage acquiring unit acquiring the output voltage and a frequency setting unit setting a switching frequency for the drive switches based on the output voltage acquired by the voltage acquiring unit. The frequency setting unit sets, for the switching frequency, a value increasing with a value of the acquired output voltage, and sets the switching frequency such that an increase in the value of the output voltage increases a frequency increase rate corresponding to an amount of increase in the switching frequency per unit amount of increase in the output voltage.

公开(公告)号：US10224826B2

公开(公告)日：2019-03-05

申请号：US15987396

申请日：2018-05-23

Applicant: SOKEN, INC. ,  DENSO CORPORATION

Inventor： Seiji Iyasu ,  Yuji Hayashi ,  Yuichi Handa

IPC: H02M3/335 ,  H02M1/00

Abstract: A control unit capable of accurately calculating a magnetization bias of a transformer is provided, thereby appropriately reducing the magnetization bias. The control unit acquires first and second currents that flow through a transformer during a period where either first or second switches individually turn ON. The control unit predicts an amount of magnetization bias in either positive side or negative side of the excitation current that flows through the transformer. The control unit reduces the magnetization bias of the transformer based on the predicted amount of magnetization bias.

公开(公告)号：US10050513B2

公开(公告)日：2018-08-14

申请号：US15816498

申请日：2017-11-17

Applicant: DENSO CORPORATION

Inventor： Seiji Iyasu ,  Yuji Hayashi ,  Kimikazu Nakamura ,  Yuichi Handa

IPC: H02M3/335 ,  H02H7/125 ,  H02H7/122 ,  H02M1/088 ,  H02M1/00

Abstract: A control apparatus is provided which controls a power converter including a first circuit including first-side switching elements, and a second circuit including second-side switching elements and a choke coil. The control apparatus includes a current obtainment unit which obtains a value of current flowing through the choke coil, and a control unit which, when power is supplied from the second circuit to the first circuit, keeps a first-side switching element ON during a predetermined time period, before turning off at least one second-side switching element in an on state, the first-side switching element generating a reverse current in the second-side switching element to be turned off. The control unit performs control of keeping the first-side switching element ON during the predetermined time period and control of turning off the second-side switching element, on condition that the obtained value of the current is more than a predetermined command value.

公开(公告)号：US12253044B2

公开(公告)日：2025-03-18

申请号：US18226551

申请日：2023-07-26

Applicant: DENSO CORPORATION

Inventor： Akira Sakamoto ,  Keisuke Kawai ,  Yuichi Handa ,  Syuya Kamizono

IPC: F02D45/00 ,  H02P9/04 ,  H02P101/45

Abstract: A control apparatus for a motor generator that is connected to an internal combustion engine. The control apparatus estimates an estimated torque pulsation that is an estimation value of torque pulsation of the internal combustion engine. The control apparatus controls the motor generator to reduce generated power and suppress decrease in a rotation speed of the internal combustion engine, when a negative torque that obstructs rotation of the internal combustion engine is generated in the estimated torque pulsation of the internal combustion engine.

公开(公告)号：US12015352B2

公开(公告)日：2024-06-18

申请号：US17697487

申请日：2022-03-17

Applicant: DENSO CORPORATION

Inventor： Shuji Kurauchi ,  Yuichi Handa ,  Seiji Iyasu ,  Yuji Hayashi

IPC: B60L50/60 ,  B60L8/00 ,  B60L53/22 ,  H02J7/02 ,  H02J7/35 ,  H02M1/00 ,  H02M3/335

CPC classification number: H02M3/33584 ,  B60L8/003 ,  B60L50/60 ,  B60L53/22 ,  H02J7/02 ,  H02J7/35 ,  H02M3/33573 ,  H02M3/33576 ,  B60L2210/30 ,  B60L2210/40 ,  H02J2207/20 ,  H02J2310/48 ,  H02M1/009

Abstract: A power conversion apparatus connected to three or more voltage units, includes three or more power conversion circuits connected to respective units of the three or more voltage units; and a multiport transformer connected to the three or more power conversion circuits at mutually different ports, in which at least one voltage unit of the three or more voltage units is an electrical load.

公开(公告)号：US11916494B2

公开(公告)日：2024-02-27

申请号：US17369483

申请日：2021-07-07

Applicant: DENSO CORPORATION

Inventor： Seiji Iyasu ,  Yuichi Handa

IPC: H02M7/5387 ,  H02M1/12 ,  H02M1/00

CPC classification number: H02M7/53871 ,  H02M1/007 ,  H02M1/0025 ,  H02M1/12

Abstract: A controller includes first and second setting sections. The first setting section sets a first duty-cycle, which is a percentage of a switch-on time period of a drive switch in one switching-cycle, by peak current-mode control to control a reactor current to be a current-command value generated based on an AC-voltage value. The second setting section sets a second duty-cycle, which is the percentage of the switch-on time period of the drive switch in one switching-cycle, by average-current-mode control to control an average value of the reactor current to be the current-command value. The controller operates the drive switch at the first duty-cycle when an absolute value of the AC-voltage value is equal to or more than a threshold less than an amplitude of the AC-voltage value, and operates the drive switch at the second duty-cycle when the absolute value of the AC-voltage value is less than the threshold.

公开(公告)号：US11258351B2

公开(公告)日：2022-02-22

申请号：US16910772

申请日：2020-06-24

Applicant: DENSO CORPORATION

Inventor： Naoto Kobayashi ,  Seiji Iyasu ,  Yuichi Handa

IPC: H02M1/32 ,  H02M7/797 ,  H02M1/00 ,  H02M1/42 ,  H02M3/158

Abstract: A control unit determines a polarity of an actual voltage value of an AC power supply if it is either positive or negative based on a detection voltage thereof detected by the voltage detector. The control unit alternately actuates a set of a first switch and a fourth switch and another set of the second switch and a third switch each time when it is determined that the polarity of the actual voltage value of the AC power supply changes. A second reactor is disposed at at least one of first and second positions. The first position is located between a first AC side terminal and a connection point located between the first switch and the second switch. The second position is located between a second AC side terminal and a connection point located between the third switch and the fourth switch.

公开(公告)号：US10910958B2

公开(公告)日：2021-02-02

申请号：US16699228

申请日：2019-11-29

Applicant: DENSO CORPORATION

Inventor： Naoto Kobayashi ,  Seiji Iyasu ,  Yuichi Handa

IPC: H02M7/797 ,  H02M1/08 ,  G01R19/165 ,  H02M1/32 ,  H02M1/00

Abstract: In a control apparatus, a voltage obtainer obtains an alternating-current voltage having a polarity across first and second alternating-current terminals. An overcurrent determiner determines whether a target current flowing through the first and second alternating-current terminals is in an overcurrent state. A controller alternately turns on a first set of first and fourth switches and a second set of second and third switches in accordance with the polarity of the alternating-current voltage. The controller changes a switching operation of at least one of the first to fourth switch being in an on state to thereby reduce the target current flowing through the first and second alternating-current terminals upon determination that the target current flowing through the first and second alternating-current terminals is in the overcurrent state.

公开(公告)号：US10763669B2

公开(公告)日：2020-09-01

申请号：US16523100

申请日：2019-07-26

Applicant: DENSO CORPORATION

Inventor： Seiji Iyasu ,  Yuji Hayashi ,  Yuichi Handa

IPC: H02J1/10 ,  G05F1/565 ,  H02M1/32 ,  H02M3/335

Abstract: A control device is applied to a power conversion system including a first DDC and a second DDC connected in parallel with a common power supply target. The control device performs the equalization control of correcting, with an output correction voltage, at least any of a voltage command value of the first DDC and a voltage command value of the second DDC to equalize an output current. Moreover, while the equalization control is being performed, it is determined on which one of an output side of the first DDC or an output side of the second DDC abnormal disconnection has been caused based on the output correction voltage.

公开(公告)号：US10432100B2

公开(公告)日：2019-10-01

申请号：US16053108

申请日：2018-08-02

Applicant: DENSO CORPORATION

Inventor： Seiji Iyasu ,  Yuji Hayashi ,  Yuichi Handa

IPC: H02M3/335 ,  H02M1/088 ,  H02M1/36 ,  H02M3/337 ,  H02M1/00

Abstract: An electric power conversion device supplies electric power of a DC power source from an input part to an output part through a power conversion circuit having a transformer and switches. The transformer has primary and secondary coils magnetically connected. The device has a choke coil, an auxiliary coil and a control part. The auxiliary coil is connected to the output part and magnetically connected to the choke coil. The auxiliary coil is wound to allow a current to flow from a negative-electrode side to a positive-electrode side of the output part when a current flows from the power source to the choke coil. The control part performs a switching control of the switches to supply electric power of the source to the output part through the auxiliary coil to prevent generation of magnetic flux in the primary coil and the current from flowing in the secondary coil.