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1.发明公开公开(公告)号：US20230361674A1
公开(公告)日：2023-11-09
申请号：US18300266
申请日：2023-04-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/157 , H02M1/0009 , H02M3/158
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：US11742751B2
公开(公告)日：2023-08-29
申请号：US17499252
申请日：2021-10-12
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
CPC classification number: H02M3/01 , H02M1/0009 , H02M1/08 , H02M3/07 , H02M3/1584 , H02M3/1586
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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公开(公告)号：US11411493B2
公开(公告)日：2022-08-09
申请号：US17319728
申请日：2021-05-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A two-stage power converter includes: a resonant switched-capacitor converter (RSCC) receiving an input voltage and generating a first stage voltage; a voltage regulator receiving the first stage voltage and generating an output voltage; and a communication interface and control circuit generating a charging operation signal, at least one discharging operation signal and a switching signal. The charging operation signal and the discharging operation signal are employed to control the RSCC to perform a charging process and at least one discharging process respectively, and the switching signal is employed to control the voltage regulator, so as to synchronize a resonant frequency of the RSCC and a switching frequency of the voltage regulator. The communication interface and control circuit adjusts a delay interval after the discharging process ends, and starts the charging process at an end time point of the delay interval.
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公开(公告)号：US20220166324A1
公开(公告)日：2022-05-26
申请号：US17520635
申请日：2021-11-06
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: a power stage circuit and a driving circuit. The power stage circuit includes: a resonant capacitor, a resonant inductor and switches. The driving circuit includes: drivers for driving the switches; and a power supply circuit for providing driving powers to the drivers. The power supply circuit includes: a voltage booster circuit generating a booster power supply according to a clock signal, a DC voltage and an output related signal; driving capacitors, wherein a voltage across each driving capacitor corresponds to one driving power; and supply diodes, which are coupled in series from the booster power supply along a forward direction of the supply diodes. A backward end of each supply diode is coupled to a positive end of one corresponding driving power, to charge one corresponding driving capacitor, thus generating the corresponding driving power.
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公开(公告)号：US11340645B2
公开(公告)日：2022-05-24
申请号：US16730940
申请日：2019-12-30
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
Abstract: A power conversion apparatus for tracking maximum power point (MPP) includes: a signal processing circuit generating a first sensing signal at a sensing node; a first comparison circuit generating a first control signal according to a difference between the first sensing signal and a first reference voltage; and a second comparison circuit sensing a second sensing signal generated from the conversion circuit. The second comparison circuit generates a second control signal according to a difference between the second sensing signal and a reference signal. The signal processing circuit includes a bias sensing circuit and a clamp circuit. The bias sensing circuit adjusts the first sensing signal according to the second control signal, to adjust the first control signal. The conversion circuit adjusts a voltage and/or current of the output power according to the adjusted first control signal, so that a power retrieval source operates near its MPP.
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Patent Agency Ranking
公开(公告)号：US20210351695A1
公开(公告)日：2021-11-11
申请号：US17221767
申请日：2021-04-02
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Chung-Lung Pai
Abstract: A resonant switching power converter includes: capacitors; switches; at least one charging inductor; and at least one discharging inductor. In a charging process, by switching the switches, the capacitors and the charging inductor form a single 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 a plural discharging paths are formed, wherein a turned-ON time point and a turned-OFF time point of the switches in the discharging process are synchronous with a start time point and an end time point of a positive half wave of a discharging resonant current of the discharging process.
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公开(公告)号：US10742072B2
公开(公告)日：2020-08-11
申请号：US15984291
申请日：2018-05-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Ke-Horng Chen
IPC: H02J50/12 , H02M1/088 , H02M7/5387 , H02M1/00
Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.
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公开(公告)号：US10574092B2
公开(公告)日：2020-02-25
申请号：US15611210
申请日：2017-06-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
Abstract: The present invention provides a wireless power transmitter circuit which includes a power converter circuit, a power inverter circuit, a resonant transmitter circuit and a power control circuit. The power conversion circuit converts an input power to a conversion output power which includes a conversion output voltage. The power inverter circuit converts the conversion output power to an AC output power. The resonant transmitter circuit converts the AC output power to a resonant wireless power. The power control circuit generates a current reference signal according to the conversion output voltage, and generates a conversion control signal according to a difference between the current reference signal and a resonant current related signal, to control the power converter circuit such that the resonant wireless power is regulated substantially at a predetermined power level.
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9.发明申请公开(公告)号：US20200045773A1
公开(公告)日：2020-02-06
申请号：US16374688
申请日：2019-04-03
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
Abstract: A heating apparatus includes: first and second heaters, first and second switches, first and second ramp signal generation circuits, a signal processor circuit, first and second comparison circuits, and a switch control circuit. The first and second ramp signal generation circuits generate first and second ramp signals according to first and second output currents, respectively. The signal processor circuit senses a temperature to generate a temperature-related signal. The first and second comparison circuits compare the first and second ramp signals with the temperature-related signal, to generate a first PWM signal and a second PWM signal for controlling the first and second switches respectively, to determine the first and second output currents so that there is a predetermined ratio between average powers of the first heater and the second heater.
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10.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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