公开(公告)号：US20250015720A1

公开(公告)日：2025-01-09

申请号：US18897541

申请日：2024-09-26

Applicant: DENSO CORPORATION

Inventor： Kenji TOMITA ,  Yasuaki AOKI ,  Yusuke UEDA ,  Takahiro SHIMIZU ,  Nobuyuki KITAMURA

IPC: H02M3/158

Abstract: A control apparatus for a DC-to-DC converter includes a switching controller working to selectively perform a first control task and a second control task. The first control task is to control on-off operations of switching devices of the DC-to-DC converter not to have at least one of an all-on period and an all-off period. The all-on period being a period of time in which all the switching devices are turned on. The all-off period is a period of time in which all the switching devices are turned off. The second control task is to control the on-off operations of the switching devices to have both the all-on period and the all-off period. The switching controller works to change the first control task to the second control task before a current mode is switched from a continuous current mode to a discontinuous current mode.

公开(公告)号：US20170085181A1

公开(公告)日：2017-03-23

申请号：US14857023

申请日：2015-09-17

Applicant: DENSO CORPORATION

Inventor： Kenji TOMITA ,  Kimikazu NAKAMURA ,  Shinya GOTO ,  Katsutoyo MISAWA ,  Yuuichi HANDA ,  Seiji IYASU

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/3378

Abstract: A power conversion apparatus supplies power from a DC power supply to a capacitive load by a current input push-pull DCDC converter provided with switching elements Q1 and Q2. When a capacitive load voltage is not larger than a second predetermined value, a first mode is used which turns ON one of the switching elements Q1 and Q2 alternated with turning OFF both. When the capacitive load voltage is larger than the second predetermined value but not larger than a first predetermined value, a second mode is used which turns ON both of the switching elements Q1 and Q2, then turns ON one of them, then turns OFF both, sequentially. When the capacitive load voltage is larger than the first predetermined value, a third mode is used, turning ON both of the switching elements Q1 and Q2 alternated with turning ON one of them.

公开(公告)号：US20190157974A1

公开(公告)日：2019-05-23

申请号：US16191986

申请日：2018-11-15

Applicant: SOKEN, INC. ,  DENSO CORPORATION

Inventor： Kenji TOMITA ,  Seiji IYASU ,  Yuichi HANDA

IPC: H02M3/158 ,  H02M1/08

Abstract: A control apparatus performs peak current mode control in which a drive switch is turned off when output of a comparator is inverted during an on-operation period determined by a basic signal. The comparator inverts the output when a reactor current increases to a command current. The control apparatus determines that a switching frequency of the drive switch is required to be switched when the output of the comparator is detected to have not become inverted during the single switching period while the peak current mode control is being performed. The control apparatus sets the switching frequency to a first frequency when the switching determining unit determines that the switching frequency is not required to be switched, and switches the switching frequency from the first frequency to a second frequency lower than the first frequency when the switching determining unit determines that the switching frequency is required to be switched.

公开(公告)号：US20190280603A1

公开(公告)日：2019-09-12

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：US20190149055A1

公开(公告)日：2019-05-16

申请号：US16185176

申请日：2018-11-09

Applicant: SOKEN, INC. ,  DENSO CORPORATION

Inventor： Kenji TOMITA ,  Seiji IYASU ,  Yuichi HANDA

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33569 ,  H02J2007/0059 ,  H02M1/4225 ,  H02M3/156 ,  H02M3/337 ,  H02M3/3376 ,  H02M7/06 ,  H02M2001/0054 ,  H02M2001/007 ,  H02M2001/327

Abstract: An apparatus for controlling a power converter includes a first converter configured to convert an AC voltage into a DC voltage by operations of an input side switch, a DC link capacitor charged with the DC voltage from the first converter, and a second converter configured to step down the DC voltage across the DC link capacitor by operations of one or more output side switches. In the apparatus, a lower limit calculator calculates a lower limit of the DC voltage across the DC link capacitor based on an output voltage of the second converter, a turns ratio of a transformer of the second converter, and a ratio of a turn-on period to one switching period for the one or more output side switches. A switch controller operates the input side switch to control the voltage across the DC link capacitor to a command voltage higher than the lower limit.

公开(公告)号：US20130336014A1

公开(公告)日：2013-12-19

申请号：US13845963

申请日：2013-03-18

Applicant: DENSO CORPORATION

Inventor： Hirofumi KINJOU ,  Keiji SHIGEOKA ,  Yuji HAYASHI ,  Kenji TOMITA ,  Kimikazu NAKAMURA

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/3376 ,  H02M7/53871

Abstract: A DC-DC converter generates PWM signals PWM1H, PWM1L on the basis of a reference signal CLK1 to drive switching elements connected in series. When generating a reset signal RST, the converter generates PWM signals PWM2H, PWM2L on the basis of the reset signal RST. When generating no reset signal, the converter generates the PWM signals PWM2H, PWM2L on the basis of a reference signal CLK2 in order to drive other switching elements connected in series. The converter generates the reset signal RST at an optional timing to the reference signal CLK1. The reference signal CLK2 is brought forward from the reference signal CLK1 by ΔT1. The PWM signals PWM1H, PWM1L are different in timing from the PWM signals PWM2H, PWM2L. This makes it possible to avoid the switching elements diagonally arranged from being simultaneously turned on and off, and suppress a switching loss, and to increase an efficiency of the converter.

Abstract translation: DC-DC转换器基于参考信号CLK1产生PWM信号PWM1H，PWM1L，以驱动串联连接的开关元件。 当产生复位信号RST时，转换器基于复位信号RST产生PWM信号PWM2H，PWM2L。 当不产生复位信号时，转换器基于参考信号CLK2产​​生PWM信号PWM2H，PWM2L，以驱动串联连接的其它开关元件。 转换器在参考信号CLK1的可选定时产生复位信号RST。 参考信号CLK2从参考信号CLK1提前DeltaT1。 PWM1H，PWM1L的PWM信号与PWM2H，PWM2L的PWM信号的时序不同。 这使得可以避免对角线布置的同时导通和截止的开关元件，并且抑制开关损耗，并且提高转换器的效率。