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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：US20240006991A1
公开(公告)日：2024-01-04
申请号：US18343048
申请日：2023-06-28
Applicant: ROHM Co., LTD.
Inventor： Kazuki Hashimoto , Akihiro KAWANO
Abstract: Provided is a controller circuit of a series capacitor step-down converter, the series capacitor step-down converter including an input line and an output line, a first switch, a coupled inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor, the controller circuit being configured to alternately switch between a first state in which the first switch and the fourth switch are on and a second state in which the second switch and the third switch are on while interposing a dead time between the first state and the second state, and turn on the second switch ahead of the third switch before a direction of a current of the first inductor is reversed in the dead time during a transition from the first state to the second state.
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3.发明公开公开(公告)号：US20240022159A1
公开(公告)日：2024-01-18
申请号：US18350243
申请日：2023-07-11
Applicant: ROHM Co., LTD.
Inventor： Kazuki Hashimoto , Akihiro KAWANO
CPC classification number: H02M1/0029 , H02M1/084 , H02M1/0043 , H02M3/072 , H02M3/1586
Abstract: Provided is a controller circuit for a series capacitor step-down converter that drives the series capacitor step-down converter at a switching frequency fsw higher than a frequency f0 represented by Equation (1)
[
Math
.
1
]
f
0
=
1
2
π
L
C
r
(
L
2
-
M
2
)
(
1
)
when a design value of inductance of two inductors constituting a coupled inductor of the series capacitor step-down converter is L, a design value of mutual inductance of the two inductors is M, and a design value of capacitance of a series capacitor is Cr.-
公开(公告)号：US20230024198A1
公开(公告)日：2023-01-26
申请号：US17865518
申请日：2022-07-15
Applicant: ROHM CO., LTD.
Inventor： Akihiro KAWANO
Abstract: A controller IC for a resonant switched capacitor converter includes a drive circuit and a frequency controller. The frequency controller controls a switching frequency based on an output voltage of the resonant switched capacitor converter.
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公开(公告)号：US20210119540A1
公开(公告)日：2021-04-22
申请号：US17071041
申请日：2020-10-15
Applicant: ROHM Co., LTD.
Inventor： Akihiro KAWANO , Yuhei YAMAGUCHI
Abstract: A switching power supply device includes first to fourth switches sequentially connected in series, an inductor, a first capacitor whose first end is connected to a connection node of the first switch and the second switch and whose second end is connected to a connection node of the third switch, the fourth switch, and the inductor, a second capacitor whose first end is connected to a connection node of the second switch and the third switch, and a controller that controls switching on and off of the first to fourth switches. In at least one of a first pair configured with the first switch and the third switch and a second pair configured with the second switch and the fourth switch, the controller shifts a timing of switching from off to on between two switches.
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Patent Agency Ranking
公开(公告)号：US20230018651A1
公开(公告)日：2023-01-19
申请号：US17812376
申请日：2022-07-13
Applicant: ROHM Co., LTD.
Inventor： Akihiro KAWANO
Abstract: Provided is a regulator circuit that supplies an output voltage to a load, the regulator circuit including an error amplifier that amplifies an error between a feedback signal and a reference voltage, and an output stage that changes the output voltage, the error amplifier including a first transconductance amplifier that receives the feedback signal and the reference voltage, a first resistance connected to an output node of the first transconductance amplifier and a ground, a first capacitor connected in parallel to the first resistance, a second transconductance amplifier that receives a voltage of the output node of the first transconductance amplifier and the feedback signal, a second resistance connected to an output node of the second transconductance amplifier and a ground, a second capacitor connected in parallel to the second resistance, and a zero controller that controls a gain of the second transconductance amplifier.
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公开(公告)号：US20220407421A1
公开(公告)日：2022-12-22
申请号：US17896140
申请日：2022-08-26
Applicant: ROHM CO., LTD.
Inventor： Akihiro KAWANO , Hiroaki ANDO
Abstract: A main comparator compares a feedback voltage VFB corresponding to an output voltage VOUT of a DC/DC converter with a reference voltage VREF and asserts a turn-on signal when the feedback voltage VFB falls below the reference voltage VREF. A timer circuit generates a turn-off signal S2 that transitions in level after an ON time TON proportional to (VOUT−VIN/VOUT has elapsed from assertion of the turn-on signal.
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8.发明公开公开(公告)号：US20240006981A1
公开(公告)日：2024-01-04
申请号：US18342920
申请日：2023-06-28
Applicant: ROHM Co., LTD.
Inventor： Kazuki Hashimoto , Akihiro KAWANO
CPC classification number: H02M1/084 , H02M1/0009 , H02M1/0029 , H02M1/0043 , H02M1/0087 , H02M3/072 , H02M3/1586
Abstract: Disclosed herein is a controller circuit for a series capacitor step-down converter. The circuit includes an oscillator that generates a clock signal, a control logic circuit that generates a plurality of control signals for controlling a plurality of switching elements of the series capacitor step-down converter in synchronization with the clock signal, a plurality of drivers that drive the plurality of switching elements according to the plurality of control signals, and a frequency controller that controls a frequency of the clock signal on the basis of an output voltage of the series capacitor step-down converter.
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公开(公告)号：US20230013594A1
公开(公告)日：2023-01-19
申请号：US17812753
申请日：2022-07-15
Applicant: ROHM Co., LTD.
Inventor： Akihiro KAWANO
Abstract: Provided is a control circuit of a step-down converter, the control circuit including a bottom detecting circuit that asserts a turn-on signal when an output voltage of the step-down converter falls below a bottom level, an on-time generating circuit that includes a second timer circuit capable of measuring an on-time TON in such a manner that the assertion of the turn-on signal is a trigger for the measurement, and is configured to obtain a relation of TON=α·VOUT/VIN when an input voltage of the step-down converter is defined as VIN, the output voltage is defined as VOUT, and a controllable coefficient is defined as α, a control logic that sets a high-side transistor to an on-state during the on-time TON from the assertion of the turn-on signal and subsequently sets a low-side transistor to an on-state until the turn-on signal is asserted next, and an on-time correcting circuit that decreases the coefficient α when a switching period of the control logic is longer than a reference period, and increases the coefficient α when the switching period of the control logic is shorter than the reference period.
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公开(公告)号：US20230013485A1
公开(公告)日：2023-01-19
申请号：US17865545
申请日：2022-07-15
Applicant: ROHM CO., LTD.
Inventor： Akihiro KAWANO
Abstract: An inductor is connected between a switching node and an output line. The first switch and the second switch are connected in series between an input line and a ground line. A third switch is connected between the switching node and the input line. A flying capacitor is connected across the third switch and the first switch. A controller IC drives the first switch to the third switch.
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