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11.发明申请公开(公告)号：US20190317540A1
公开(公告)日：2019-10-17
申请号：US16280941
申请日：2019-02-20
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
IPC: G05F1/67
Abstract: A power conversion apparatus for tracking maximum power point, includes: a signal processing circuit, which generates a sensing signal at a sensing node according to an input voltage; and a comparison circuit, which controls a converter circuit according to a difference between the sensing signal and a reference voltage, to convert the input voltage to an output power. The signal processing circuit includes: a bias sensing circuit, which generates the sensing signal at the sensing node according to the input voltage; and a clamp circuit coupled to the sensing node, for clamping the sensing signal to be not greater than a clamp voltage. The converter circuit adjusts an output voltage and/or an output current of the output power, so that a power retrieval source operates near its maximum power point.
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公开(公告)号：US20180212464A1
公开(公告)日：2018-07-26
申请号：US15600372
申请日：2017-05-19
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
CPC classification number: H02J50/10 , H02J5/005 , H02J7/025 , H02J50/12 , H02M2007/4818 , H04B5/0037
Abstract: A wireless power transmitter circuit includes a power inverter circuit, a resonant transmitter circuit and a control circuit. The power inverter circuit converts a DC power to an AC output power which includes an AC output current. The resonant transmitter circuit, including a variable capacitor circuit, converts the AC output power to a resonant wireless power which includes a resonant current. The control circuit generates an impedance control signal according to a resonant current related signal and a current reference signal, for controlling the impedance of the variable capacitor circuit to regulate the resonant current or the AC output current substantially at a predetermined current level.
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公开(公告)号：US20180006496A1
公开(公告)日：2018-01-04
申请号：US15587676
申请日：2017-05-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chia-Hung Tsen
IPC: H02J50/12
Abstract: The present invention provides a resonant wireless power transmitter circuit, including: a load circuit, a power conversion circuit which is coupled between an input power supply and the load circuit, and a phase detection and control circuit. The power conversion circuit includes plural power switches and a current sensing device. The plural power switches operate with an operating frequency to convert the input power supply to an output power for driving the load circuit, wherein the load circuit has a load current. The load current has a load current phase difference from the switching frequency. The phase detection and control circuit detects a voltage difference between the current inflow terminal and the current outflow terminal of the current sensing device within a dead time in which the plural power switches are not conductive. The voltage difference corresponds to the load current phase difference.
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公开(公告)号：US12199516B2
公开(公告)日：2025-01-14
申请号：US18486261
申请日：2023-10-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A multi-phase switching converter, includes: plural sub-switching converters; and a control circuit. Plural switching signals operate a capacitor of one of the plural sub-switching converters and a capacitor of another one of the plural sub-switching converters, to conduct a switched capacitor switching on a first voltage, thus switching an inductor switching node in each sub-switching converter between a divided voltage of the first voltage and a reference potential and to thereby execute a power conversion between the first voltage and a second voltage. When the inductors of each of the plural sub-switching converters are coupled with one another in a non-electromagnetic fashion, the multi-phase switching converters operate in a non-resonant mode. When the inductors of at least two of the plural sub-switching converters are electromagnetically coupled with one another, the multi-phase switching converters operate in a resonant mode or in the non-resonant mode.
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15.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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Patent Agency Ranking
16.发明授权公开(公告)号：US12176811B2
公开(公告)日：2024-12-24
申请号：US18300266
申请日：2023-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The control circuit generates a pulse width modulation (PWM) signal according to a first voltage or a second voltage and generates a control signal according to the PWM signal and a zero current detection signal. The control signal controls the switched capacitor converter by operating the corresponding switches to switch electrical connection of the inductor, so as to convert the first voltage to the second voltage or convert the second voltage to the first voltage.
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公开(公告)号：US20240405683A1
公开(公告)日：2024-12-05
申请号：US18595467
申请日：2024-03-05
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A multi-level switching converter circuit for converting a first voltage to a second voltage or convert the second voltage to the first voltage, includes: a power stage circuit and a control circuit. Through a valley current mode control, the conversion control circuit generates a first ramp signal to determine a first duty ratio of the first control signal, and generates a second ramp signal to determine a second duty ratio of the second control signal, thereby a switching node connected to one end of an inductor is switched between two of k levels of voltages, such that the first voltage or the second voltage is regulated to a predetermined target level, and a flying capacitor voltage across the flying capacitor is regulated and balanced at one (k-1)th of the first voltage.
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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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19.发明公开公开(公告)号：US20230246548A1
公开(公告)日：2023-08-03
申请号：US18149112
申请日：2023-01-01
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang
CPC classification number: H02M3/07 , H02M1/08 , H02M1/0009
Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage, includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least two capacitors, plural switches and at least one inductor. In a mode switching period wherein the switched capacitor converter switches from a present conversion mode to a next conversion mode, at least two forward switches of the plural switches operate in a unidirectional conduction mode. Each of the forward switches provides a current channel that unidirectionally flows toward the second voltage in the unidirectional conduction mode. The switched capacitor voltage converter circuit is also operable to convert the second voltage to the first voltage.
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公开(公告)号：US20230223843A1
公开(公告)日：2023-07-13
申请号：US18065205
申请日：2022-12-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/07 , H02M1/0058 , H02M3/158
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter, a control circuit and a zero current estimation circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The zero current estimation circuit is coupled to the at least one inductor and/or the at least one resonant capacitor, for estimating a time point at which a first resonant current is zero during a first process and/or a time point at which a second resonant current is zero during a second process according to a voltage difference between two ends of the inductor, and/or a voltage difference between two ends of the resonant capacitor, to a generate a zero current estimation signal accordingly for generating the operation signal.
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