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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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公开(公告)号：US20210384820A1
公开(公告)日：2021-12-09
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：US20210367520A1
公开(公告)日：2021-11-25
申请号：US17244920
申请日：2021-04-29
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Chung-Lung Pai , Ta-Yung Yang
IPC: H02M3/158 , H02M3/00 , G01R19/175 , H02M1/00
Abstract: A resonant switching power converter includes: plural capacitors; plural switches; at least one charging inductor; at least one discharging inductor; a controller which generates a charging operation signal and at least one discharging operation signal; and at least one zero current detection circuit which detects a charging resonant current flowing through the charging inductor in a charging process and/or detect a discharging resonant current flowing through the discharging inductor in a discharging process. When detecting that a level of the charging resonant current or a level of the discharging resonant current is zero, the zero current detection circuit generates at least one zero current detection signal which is sent to the controller. The controller determines start time points and end time points of the charging process and the discharging process according to the zero current detection signal. There can be plural discharging processes.
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公开(公告)号：US20210328507A1
公开(公告)日：2021-10-21
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：US11139670B2
公开(公告)日：2021-10-05
申请号：US16046979
申请日：2018-07-26
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
Abstract: A charger circuit with temperature compensation function includes: a power converter, an input voltage sense circuit, an output adjustment circuit and a charging control circuit. The power converter converts an input voltage supplied from a photovoltaic power module to an output voltage. The input voltage sense circuit generates a signal related to the input voltage according to the input voltage. The output adjustment circuit generates an output adjustment signal according to the signal related to the input voltage. The charging control circuit generates a control signal according to the output adjustment signal, thereby adjusting a level of an output current supplied from the power converter. When a level of the input voltage is smaller than a predetermined voltage threshold, the power converter decreases the output current.
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Patent Agency Ranking
公开(公告)号：US10819166B2
公开(公告)日：2020-10-27
申请号：US16122988
申请日：2018-09-06
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
Abstract: A wireless power transfer system includes: a transmitting side, which includes a resonant transmitting circuit, the resonant transmitting circuit including a transmitter coil; and a receiving side, which includes a resonant receiving circuit, the resonant receiving circuit including a receiver coil for performing induction with the transmitter coil to generate a resonant receiver voltage, wherein the transmitter adjusts a transmitter current of the resonant transmitting circuit according to the resonant receiver voltage such that the resonant receiver voltage is regulated to a target voltage level. The wireless power transfer system determines a shift distance from a present relative position to an optimal relative position according to the adjusted transmitter current of the resonant transmitting circuit.
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37.发明申请公开(公告)号：US20200285263A1
公开(公告)日：2020-09-10
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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公开(公告)号：US20200153285A1
公开(公告)日：2020-05-14
申请号：US16739702
申请日：2020-01-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
IPC: H02J50/12
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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公开(公告)号：US10447082B2
公开(公告)日：2019-10-15
申请号：US15600372
申请日：2017-05-19
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
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：US20180375380A1
公开(公告)日：2018-12-27
申请号：US15984291
申请日：2018-05-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Ke-Horng Chen
IPC: H02J50/12 , H02M7/5387 , H02M1/088
CPC classification number: H02J50/12 , H02M1/088 , H02M7/5387 , H02M2001/0048
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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