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公开(公告)号：US11728719B2
公开(公告)日：2023-08-15
申请号：US17439512
申请日：2020-04-10
Applicant: Rohm Co., Ltd.
Inventor： Isao Takobe
CPC classification number: H02M1/0045 , B60L1/00 , H02M1/088 , H02M3/07
Abstract: A linear power supply circuit includes an output transistor provided between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied, and a driver configured to drive the output transistor based on the difference between a voltage based on the output voltage and a reference voltage. The driver includes a differential amplifier, a converter, and a first capacitor provided between the output of the differential amplifier and a ground potential. The linear power supply circuit further includes a source follower circuit including a first transistor, and moreover includes a second transistor connected in series with the output transistor and constituting together with the first transistor a current mirror circuit, and a second capacitor connected to the control terminal of the first transistor.
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公开(公告)号：US20220242340A1
公开(公告)日：2022-08-04
申请号：US17724733
申请日：2022-04-20
Applicant: ROHM CO., LTD.
Inventor： Isao Takobe , Yuhei Yamaguchi , Tetsuo Tateishi , Takeshi Nagata
Abstract: A linear power supply circuit according to the present invention is provided with: an output transistor provided between an input end to which an input voltage is applied and an output end to which an output voltage is applied; and a driver for driving the output transistor on the basis of the difference between a voltage based on the output voltage and a reference voltage. The driver is provided with: a differential amplifier for outputting a voltage according to the difference between the voltage based on the output voltage and the reference voltage; a capacitor one end of which has an output of the differential amplifier applied thereto and the other end of which has the voltage based on the output voltage applied thereto; a converter for converting a voltage based on the output of the differential amplifier into an electrical current and outputting the electrical current; and an electrical current amplifier for amplifying the electrical current of the output of the converter. The supply voltage of the differential amplifier is a first constant voltage or the input voltage.
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公开(公告)号：US12040709B2
公开(公告)日：2024-07-16
申请号：US17615931
申请日：2020-06-12
Applicant: ROHM CO., LTD.
Inventor： Kosuke Sato , Tetsuo Tateishi , Shingo Hashiguchi , Isao Takobe , Yuhei Yamaguchi
IPC: H02M3/158 , B60R16/033 , H02M1/088 , H02M1/32 , H02M1/44
CPC classification number: H02M3/158 , B60R16/033 , H02M1/088 , H02M1/32 , H02M1/44
Abstract: A switching power supply device includes a first switch with a first terminal connectable to an application terminal for the input voltage and a second terminal connectable to the first terminal of an inductor; a second switch with a first terminal connectable to the first terminal of the inductor and a second terminal connectable to an application terminal for a voltage lower than the input voltage; a third switch with a first terminal connectable to the first terminal of the inductor and a second terminal connectable to the second terminal of the inductor; a detector; and a controller. The controller produces, after occurrence or a sign of occurrence of an overshoot in the output voltage is detected by the detector until settlement of the overshoot in the output voltage, a control state in which to keep the first and second switches off and the third switch on.
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公开(公告)号：US20230361673A1
公开(公告)日：2023-11-09
申请号：US18312861
申请日：2023-05-05
Applicant: ROHM Co., LTD.
Inventor： Isao Takobe
Abstract: Disclosed herein is a power supply semiconductor device used in a switched capacitor converter including a plurality of power transistors and a plurality of capacitors, the switched capacitor converter configured to turn on and off the plurality of power transistors according to a predetermined pattern to generate an output voltage from an input voltage. The power supply semiconductor device includes a control block configured to generate a control signal for designating ON or OFF of each of the power transistors, and a drive block connected to a gate of each of the power transistors and configured to drive the gate of each of the power transistors according to the control signal to turn on or off each of the power transistors.
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公开(公告)号：US11567521B2
公开(公告)日：2023-01-31
申请号：US17529765
申请日：2021-11-18
Applicant: Rohm Co., Ltd.
Inventor： Takeshi Nagata , Isao Takobe , Yuhei Yamaguchi
Abstract: A linear power supply circuit, includes: output transistor between input terminal where input voltage is applied and output terminal where output voltage is applied; a driver driving the output transistor based on difference between voltage based on the output voltage and reference voltage; and phase compensation circuit, wherein the driver includes differential amplifier outputting voltage corresponding to the difference between the voltage based on the output voltage and the reference voltage, a first capacitance having one end where output of the differential amplifier is applied and the other end where ground potential is applied, a converter converting the voltage based on the output of the differential amplifier into current, and a current amplifier amplifying the current output from the converter, and wherein the phase compensation circuit lowers gain of transfer function of the linear power supply circuit and output capacitor connected to the output terminal.
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Patent Agency Ranking
公开(公告)号：US20210380053A1
公开(公告)日：2021-12-09
申请号：US17286850
申请日：2019-10-24
Applicant: Rohm Co., Ltd.
Inventor： Isao Takobe , Yuhei Yamaguchi , Tetsuo Tateishi , Takeshi Nagata
Abstract: A linear power supply circuit is provided with: an output transistor; and a driver for driving the output transistor on the basis of the difference between a voltage based on an output voltage and a reference voltage. The driver is provided with: a differential amplifier for outputting a voltage according to the difference between the voltage based on the output voltage and the reference voltage; a capacitor one end of which has an output of the differential amplifier applied thereto and the other end of which has the voltage based on the output voltage applied thereto; a converter for converting a voltage based on the output of the differential amplifier into an electrical current and outputting the electrical current; and a current amplifier for amplifying the electrical current of the output of the converter. The supply voltage of the differential amplifier is a first constant voltage or the input voltage.
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公开(公告)号：US20210376727A1
公开(公告)日：2021-12-02
申请号：US17330775
申请日：2021-05-26
Applicant: ROHM Co., LTD.
Inventor： Shingo Hashiguchi , Isao Takobe , Keita Itohara , Akihiro KAWANO , Hironori SUMITOMO
Abstract: The switching power supply device includes first and second switches connected in series between an application end of an input voltage and an application end of a low voltage lower than the input voltage, and third and fourth switches connected in series between an application end of the input voltage and an application end of the low voltage, and a control unit configured to control the on/off state of each of the first to fourth switches. The first to fourth switches are configured such that an inductor is provided between a first connection node connecting the first switch and the second switch and a second connection node connecting the third switch and the fourth switch.
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公开(公告)号：US20230406244A1
公开(公告)日：2023-12-21
申请号：US18460004
申请日：2023-09-01
Applicant: ROHM CO., LTD.
Inventor： Isao Takobe , Yuhei Yamaguchi , Tetsuo Tateishi , Takeshi Nagata
Abstract: A linear power supply circuit according to the present invention is provided with: an output transistor provided between an input end to which an input voltage is applied and an output end to which an output voltage is applied; and a driver for driving the output transistor on the basis of the difference between a voltage based on the output voltage and a reference voltage. The driver is provided with: a differential amplifier for outputting a voltage according to the difference between the voltage based on the output voltage and the reference voltage; a capacitor one end of which has an output of the differential amplifier applied thereto and the other end of which has the voltage based on the output voltage applied thereto; a converter for converting a voltage based on the output of the differential amplifier into an electrical current and outputting the electrical current; and an electrical current amplifier for amplifying the electrical current of the output of the converter. The supply voltage of the differential amplifier is a first constant voltage or the input voltage.
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公开(公告)号：US20230369971A1
公开(公告)日：2023-11-16
申请号：US18314367
申请日：2023-05-09
Applicant: ROHM Co., LTD.
Inventor： Isao Takobe
IPC: H02M3/07
CPC classification number: H02M3/07
Abstract: Disclosed is a control circuit of a switched capacitor converter, the switched capacitor converter including a plurality of capacitors and a plurality of switching elements, the control circuit including a control unit configured to control switching of the plurality of switching elements, and a charging unit configured to charge at least some of the plurality of capacitors such that a potential difference across each of the at least some of the plurality of capacitors becomes equal to or more than a voltage lower limit set value, and the control unit being configured to start the switching after charging by the charging unit is completed.
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公开(公告)号：US11550349B2
公开(公告)日：2023-01-10
申请号：US17283389
申请日：2019-10-21
Applicant: ROHM CO., LTD.
Inventor： Isao Takobe , Yuhei Yamaguchi , Yukihiro Watanabe , Shingo Hashiguchi
Abstract: A linear power supply circuit according to the present invention is provided with: an output transistor provided between an input end to which an input voltage is applied and an output end to which an output voltage is applied; a driver for driving the output transistor; and a feedback unit for feeding, back to the driver, information about an output electrical current that is output from the output end. The driver drives the output transistor on the basis of the difference between a voltage based on the output voltage and a reference voltage, as well as the information.
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