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1.发明授权公开(公告)号：US12184168B2
公开(公告)日：2024-12-31
申请号：US17838195
申请日：2022-06-11
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit; wherein the control circuit adjusts operation frequencies and/or duty ratios of operation signals which control switches of the switched capacitor converter, so as to adjust a ratio of a first voltage to a second voltage to a predetermined ratio. When the control circuit decreases the duty ratios of the operation signals, if a part of the switches of the switched capacitor converter are turned ON, an inductor current flowing toward the second voltage is in a first state; if the inductor current continues to flow via a current freewheeling path, the inductor current flowing toward the second voltage becomes in a second state. A corresponding inductor is thereby switched between the first state and the second state to perform inductive power conversion.
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公开(公告)号：US11736007B2
公开(公告)日：2023-08-22
申请号：US17221767
申请日：2021-04-02
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Chung-Lung Pai
CPC classification number: H02M3/155 , H02M3/01 , H02M3/07 , H02M1/0095
Abstract: A resonant switching power converter includes: capacitors; switches; one charging inductor; and one discharging inductor. In a charging process, by switching the switches, the capacitors and the charging inductor form a charging path between an input voltage and an output voltage, wherein a turned-ON time point and a turned-OFF time point of the switches are synchronous with a start time point and an end time point of a positive half wave of a charging resonant current. In a discharging process, by switching the switches, each capacitor and the discharging inductor are connected in series between the output voltage and a ground voltage level, whereby plural discharging paths are formed, wherein a turned-ON time point and a turned-OFF time point of the switches are synchronous with a start time point and an end time point of a positive half wave of a discharging resonant current.
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3.发明申请公开(公告)号：US20230028873A1
公开(公告)日：2023-01-26
申请号：US17838195
申请日：2022-06-11
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit; wherein the control circuit adjusts operation frequencies and/or duty ratios of operation signals which control switches of the switched capacitor converter, so as to adjust a ratio of a first voltage to a second voltage to a predetermined ratio. When the control circuit decreases the duty ratios of the operation signals, if a part of the switches of the switched capacitor converter are turned ON, an inductor current flowing toward the second voltage is in a first state; if the inductor current continues to flow via a current freewheeling path, the inductor current flowing toward the second voltage becomes in a second state. A corresponding inductor is thereby switched between the first state and the second state to perform inductive power conversion.
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公开(公告)号：US11955884B2
公开(公告)日：2024-04-09
申请号：US17719568
申请日：2022-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
CPC classification number: H02M3/07 , H02M1/36 , H02M3/01 , H02M3/158 , H02M1/0095
Abstract: A resonant switching power converter circuit including: a switching converter, a control circuit and a pre-charging circuit; wherein the control circuit controls a first switch of the switching converter in a pre-charging mode, so as to control electrical connections between a first power and at least one of plural capacitors of the switching converter, and to control other switches of the switching converter, so as to control the pre-charging circuit to charge at least one capacitor to a predetermined voltage; wherein in a start-up mode, the plural switches control electrical connections of the capacitors according to first and second operation signals, such that after the pre-charging mode ends, the switching converter subsequently operates in the start-up mode; wherein in the start-up mode, the first and second operation signals have respective ON periods, and the time lengths of the ON periods increase gradually.
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公开(公告)号：US20220140726A1
公开(公告)日：2022-05-05
申请号：US17499252
申请日：2021-10-12
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: a first power stage circuit; a second power stage circuit; a controller; and a current sensing circuit configured to sense a first charging/discharging resonant current flowing through a first charging/discharging inductor of the first power stage circuit and sense a second charging/discharging resonant current flowing through a second charging/discharging inductor of the second power stage circuit, to generate a corresponding first current sensing signal and a corresponding second current sensing signal, respectively. The controller adjusts at least one of a first delay interval, a second delay interval, a third delay interval, a fourth delay interval, and/or input voltages, according to a first current sensing signal and a second current sensing signal, so that a constant ratio between an output current of the first power stage circuit and an output current of the second power stage circuit is achieved.
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Patent Agency Ranking
公开(公告)号：US20210399621A1
公开(公告)日：2021-12-23
申请号：US17325778
申请日：2021-05-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: at least one capacitor; switches coupled to the at least one capacitor; at least one charging inductor; at least one discharging inductor; and a zero current estimation circuit. The switches switch electrical connection relationships of capacitors according to an operation signal. The zero current estimation circuit estimates a time point at which a charging resonant current is zero during a charging process and/or estimate a time point at which a discharging resonant current is zero during at least one discharging process according to voltage differences across two ends of the charging inductor and/or the discharging inductor, so as to correspondingly generate a zero current estimation signal. The zero current estimation signal is adopted to generate the operation signal.
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公开(公告)号：US20210376717A1
公开(公告)日：2021-12-02
申请号：US17244933
申请日：2021-04-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: capacitors; switches; at least one charging inductor; at least one discharging inductor; a controller generating a charging operation signal corresponding to charging process and discharging operation signals corresponding to discharging processes, to operate the switches to switch electrical connection relationships of the capacitors. In the charging process, the controller controls the switches via the charging operation signal, so that a series connection of the capacitors and the charging inductor is formed between the input voltage and the output voltage, which forms a charging path. In the discharging processes, the controller controls the switches via the discharging operation signals, so that a series connection of one of the capacitors and the discharging inductor is formed between the output voltage and a ground voltage level, to form plural discharging paths at different periods in a sequential order.
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公开(公告)号：US11552547B2
公开(公告)日：2023-01-10
申请号：US17325778
申请日：2021-05-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: at least one capacitor; switches coupled to the at least one capacitor; at least one charging inductor; at least one discharging inductor; and a zero current estimation circuit. The switches switch electrical connection relationships of capacitors according to an operation signal. The zero current estimation circuit estimates a time point at which a charging resonant current is zero during a charging process and/or estimate a time point at which a discharging resonant current is zero during at least one discharging process according to voltage differences across two ends of the charging inductor and/or the discharging inductor, so as to correspondingly generate a zero current estimation signal. The zero current estimation signal is adopted to generate the operation signal.
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公开(公告)号：US11418112B2
公开(公告)日：2022-08-16
申请号：US17210434
申请日：2021-03-23
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Chung-Lung Pai
Abstract: A power converter includes: capacitors; switches coupled to the corresponding capacitors, wherein the switches switch electrical connection relationships of corresponding capacitors according to operation signals; one or more charging inductors connected in series to one or more corresponding capacitors; one or more discharging inductors connected in series to one or more corresponding capacitors. In a charging process, by switching the switches, a series connection of the capacitors and the corresponding charging inductor(s) is formed between the input voltage and the output voltage, so as to form a charging path. In a discharging process, by switching the switches, each capacitor and one of the corresponding discharging inductors are connected in series between the output voltage and ground voltage level, so as to form plural discharging paths. The charging process and the discharging process are arranged in alternating and repetitive manner, to convert the input voltage to the output voltage.
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公开(公告)号：US20220029531A1
公开(公告)日：2022-01-27
申请号：US17361866
申请日：2021-06-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
IPC: H02M3/07
Abstract: A resonant switching power converter includes: capacitors, switches, at least one charging inductor, at least one discharging inductor and a pre-charging circuit. The pre-charging circuit controls a first switch of the switches when the resonant switching power converter operates in a pre-charging mode, to control an electrical connection relationship between the input voltage and a first capacitor of the capacitors and to control other capacitors of the capacitors, thus controlling the capacitors to be connected in parallel to one another or to be connected in series to one another, so that when a voltage drop across the first capacitor is lower than a predetermined voltage, the voltage drop across each capacitor is charged to the predetermined voltage. After operating in the pre-charging mode, the resonant switching power converter subsequently operates in a resonant voltage conversion mode, to thereby convert an input voltage to an output voltage.
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