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71.发明授权公开(公告)号：US10680463B2
公开(公告)日：2020-06-09
申请号：US15095087
申请日：2016-04-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
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公开(公告)号：US10601252B2
公开(公告)日：2020-03-24
申请号：US15587676
申请日：2017-05-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chia-Hung Tsen
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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73.发明申请公开(公告)号：US20190052110A1
公开(公告)日：2019-02-14
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：US20180212469A1
公开(公告)日：2018-07-26
申请号：US15611267
申请日：2017-06-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chi-Min Lee
CPC classification number: H02J50/12 , H02J50/40 , H02J50/80 , H04B5/0037
Abstract: The present invention provides a multi-mode wireless power receiver circuit which includes a first and a second resonant circuits, a first and a second rectifier circuits, a DC-DC conversion circuit, and an output power control circuit. The first and the second resonant circuits receive a first and a second wireless power to generate a first and a second AC resonant signals respectively. The first and the second rectifier circuits rectify the first and the second AC resonant signals to generate a first and a second rectified output signals respectively. The DC-DC conversion circuit converts the second rectified output signal into a DC output signal. The output power control circuit combines the DC output signal and the first rectified output signal to generate a system output signal, and controls the DC-DC conversion circuit by a conversion control signal to adjust the system output signal such that the system output signal meets a power requirement.
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公开(公告)号：US20180212468A1
公开(公告)日：2018-07-26
申请号：US15611210
申请日：2017-06-01
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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76.发明授权公开(公告)号：US09853506B2
公开(公告)日：2017-12-26
申请号：US15154792
申请日：2016-05-13
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei
CPC classification number: H02J50/12 , H02M7/217 , H02M7/219 , Y02B70/1441
Abstract: The present invention provides a resonant wireless power receiver circuit, comprising: a resonant circuit for receiving a wireless power to generate a AC resonant signal which has an amplitude; a bridge rectifier circuit which includes a multi-mode switch, for rectifying the AC resonant signal to a rectifier output signal to drive a load, wherein the rectifier output signal includes a rectifier output voltage and a rectifier output current; and a feedback control circuit for generating a switch control signal according to a feedback signal related to the rectifier output signal to control the multi-mode switch to operate in a Conductive Operation at least for a partial time in a cycle period, such that the rectifier output voltage is substantially twice the amplitude, or the rectifier output voltage corresponds to an output voltage reference and/or the rectifier output voltage corresponds to an output current reference.
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公开(公告)号：US09823675B2
公开(公告)日：2017-11-21
申请号：US15284755
申请日：2016-10-04
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Wei-Hsin Wei
CPC classification number: G05F1/46 , H02J7/025 , H02M1/4225 , H02M3/06 , H02M3/156 , H02M3/158 , H02M3/1588 , H02M7/06 , H02M2001/0054 , H03H7/38
Abstract: A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor connected in series configuration, and arranged to operably receive an input signal and generating a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit coupled with the output node and arranged to operably rectify the resonance signal; a current control unit connected with the resonance circuit in series configuration; a stabilizing capacitor coupled with an output terminal of the rectifying circuit and arranged to operably provide a DC output signal having a voltage level greater than that of the input signal; and a control circuit coupled with the output terminal of the rectifying circuit and the current control unit, and arranged to operably adjust a current passing through the current control unit to thereby change the DC output signal.
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公开(公告)号：US20160254679A1
公开(公告)日：2016-09-01
申请号：US15040558
申请日：2016-02-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei
Abstract: A resonant wireless power receiver circuit includes an adjustable impedance matching circuit and a receiver circuit, the impedance matching circuit and the receiver circuit in combination receive a wireless power and generate a resonant output. A rectifier is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit to rectify the resonant output to generate a rectified output. The impedance of the adjustable impedance matching circuit is controlled by a feedback control circuit such that the load impedance of rectified output is regulated at a pre-determined impedance value, or the voltage of the rectified output is regulated at a pre-determined voltage value
Abstract translation: 谐振无线电力接收器电路包括可调阻抗匹配电路和接收器电路，阻抗匹配电路和接收器电路组合地接收无线电力并产生谐振输出。 整流器耦合到可调阻抗匹配电路和接收器电路的组合，以整流谐振输出以产生整流输出。 可调阻抗匹配电路的阻抗由反馈控制电路控制，使得整流输出的负载阻抗被调节在预定的阻抗值，或整流输出的电压被调节在预定的电压值
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