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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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公开(公告)号：US20240055990A1
公开(公告)日：2024-02-15
申请号：US18363922
申请日：2023-08-02
Applicant: ROHM Co., LTD.
Inventor： Akihiro Kawano , Kazuki Hashimoto
Abstract: Disclosed herein is a controller circuit of a series capacitor buck converter including input and output lines, a first switch, a coupled inductor including a first inductor and a second inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor. The controller circuit includes a control logic circuit that generates a plurality of control signals instructing ON-OFF states of the first to fourth switches so as to alternately repeat 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, with an interval of dead time, and a first timing generator that generates a first timing signal as a trigger for turning on the first switch at a second dead time inserted into a period of transition from the second state to the first 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.-
4.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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