公开(公告)号：US12230462B2

公开(公告)日：2025-02-18

申请号：US17946721

申请日：2022-09-16

Applicant: Rohm Co., Ltd.

Inventor： Hiroto Oshita ,  Tetsuo Tateishi ,  Yosuke Fukumoto ,  Yuhei Yamaguchi ,  Yoju Imamura ,  Genki Tsuruyama

IPC: H01H47/32 ,  H02M1/08 ,  H03K7/08

Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

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.

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

IPC: B60R16/03 ,  G05F1/575 ,  G05F1/59

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.

公开(公告)号：US11005369B2

公开(公告)日：2021-05-11

申请号：US16323853

申请日：2017-08-02

Applicant: Rohm Co., Ltd.

Inventor： Shingo Hashiguchi ,  Tetsuo Tateishi

IPC: H02M3/158 ,  H02M3/155 ,  B60R16/033

Abstract: Provided is an integrated circuit package which complementarily switches on/off a MOS transistor Q1 (first switch) and MOS transistor Q2 (second switch) in accordance with an output voltage Vout, and which externally outputs a pulse signal having a fixed on-duty D during a step-up/step-down mode. The integrated circuit package has a determination unit 61 for determining the impedance of an external component connected to an external pin P5 that outputs the pulse signal to the exterior during the step-up/step-down mode, and determining whether the external component is a third switch on the basis of the impedance determination result.

公开(公告)号：US10826397B2

公开(公告)日：2020-11-03

申请号：US16374929

申请日：2019-04-04

Applicant: Rohm Co., Ltd.

Inventor： Seiji Takenaka ,  Masashi Nagasato ,  Tetsuo Tateishi

IPC: H02M3/158 ,  H02M3/156

Abstract: A switching power supply includes: a switching output circuit configured to generate an output voltage from an input voltage by charging a capacitor by turning on and off an output transistor; a control circuit configured to halt the driving of the switching output circuit when charging electric charge to the capacitor per switching event is limited to a lower limit value and the output voltage, or a feedback voltage commensurate therewith, is raised from a predetermined reference voltage; and a lower limit value setting circuit configured to variably control the lower limit value during the driven period of the switching output circuit. For example, the lower limit value setting circuit can increase the lower limit value with increase in the number of times of switching.

公开(公告)号：US09954442B2

公开(公告)日：2018-04-24

申请号：US15459100

申请日：2017-03-15

Applicant: Rohm Co., Ltd.

Inventor： Genki Tsuruyama ,  Tetsuo Tateishi

IPC: H02M3/157 ,  H02M3/158

CPC classification number: H02M3/1588 ,  G01R19/0038 ,  H02M3/156

Abstract: A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).

公开(公告)号：US11664775B2

公开(公告)日：2023-05-30

申请号：US17725860

申请日：2022-04-21

Applicant: Rohm Co., Ltd.

Inventor： Masashi Nagasato ,  Seiji Takenaka ,  Tetsuo Tateishi

IPC: H03F3/217 ,  H03F3/45 ,  H02M3/158 ,  H03F1/52

CPC classification number: H03F3/45475 ,  H02M3/158 ,  H03F1/523 ,  H03F3/2171 ,  H03F2200/351 ,  H03F2203/45726

Abstract: This switching power source 100 has: a switching output circuit 110 which drives an inductor current IL by turning on and off an upper switch 111 and a lower switch 112 and generates an output voltage VOUT from an input voltage PVDD; a lower current detection unit 210 which detects the inductor current IL flowing through the lower switch 112 during an ON-period of the lower switch 112 and acquires lower current feedback information Iinfo; an error amplifier 140 which outputs voltage feedback information Vinfo including information on an error between the output voltage VOUT (feedback voltage FB) and a reference voltage REF; an information synthesis unit 220 that generates synthesis feedback information VIinfo by synthesizing Iinfo with Vinfo; and an information holding unit 230 which samples Vinfo during the ON-period of the lower switch 112.

公开(公告)号：US20220311323A1

公开(公告)日：2022-09-29

申请号：US17841797

申请日：2022-06-16

Applicant: Rohm Co., Ltd.

Inventor： Yuhei Yamaguchi ,  Tetsuo Tateishi

IPC: H02M1/088 ,  H03K17/082 ,  H02M3/158 ,  B60R16/033 ,  H02H7/12 ,  H02M1/32

Abstract: A switching regulator control circuit is used in a switching regulator that converts an input voltage into an output voltage by the switching of a switching device, and generates a switching signal for controlling the ON/OFF operation of the switching device. The switching regulator control circuit has a fault detector and a fault protector. The fault detector detects, based on the duty ratio of the switching signal or a variable correlated to it and included in a control signal used to generate the switching signal, a fault state where the duty ratio falls outside the normal modulation range. The fault protector stops the switching of the switching device when the fault detector detects a fault state.

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

IPC: B60R16/03 ,  G05F1/575 ,  G05F1/59

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.

公开(公告)号：US11374556B2

公开(公告)日：2022-06-28

申请号：US16753458

申请日：2018-10-01

Applicant: Rohm Co., Ltd.

Inventor： Genki Tsuruyama ,  Tetsuo Tateishi

IPC: H02M3/156 ,  H03K3/017 ,  H03K5/04 ,  H03K5/153

Abstract: A sequence circuit (1) includes a detector (2) that detects an occurrence of an event based on an input signal, an acceptor (4) that accepts the event whose occurrence has been detected by the detector, an inhibitor (4) that inhibits the acceptor from accepting another event for a first period using the acceptance of one event by the acceptor as a trigger, a clock pulse generator (3) that generates one or more clock pulses during a period after a second period shorter than the first period elapses from the start of the first period until the first period ends, a determiner (5) that determines a next state based on a current slate and the event accepted by the acceptor, and a latch (6) that latches the next state using the clock pulse. An output of the latch is the current state.