Patents by Inventor Wei-Hsin Wei

Wei-Hsin Wei has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200335976
    Abstract: A rapid shutdown (RSD) control circuit includes: a RSD controller having first and second terminals coupled to first and second terminals of a photovoltaic cell module, respectively; a transistor having a gate coupled to the RSD controller, a source coupled to the second terminal of the photovoltaic cell module, and a drain; and a diode coupled between the drain of the transistor and the first terminal of the photovoltaic cell module. In a normal state, controlled by the RSD controller, the transistor is controlled to have a first impedance state and the photovoltaic cell module outputs an output power to an inverter. In a shutdown state, controlled by the RSD controller, the transistor and the diode are controlled as a variable impedance, and thus a voltage between the first terminal and the second terminal of the photovoltaic cell module is regulated to a desired voltage.
    Type: Application
    Filed: April 16, 2019
    Publication date: October 22, 2020
    Inventors: Wei-Hsin WEI, Teng-Hung CHANG
  • Publication number: 20200259372
    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.
    Type: Application
    Filed: April 28, 2020
    Publication date: August 13, 2020
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei, Chih-Hsien Wang
  • Publication number: 20200235658
    Abstract: An operation method for a DC/DC converter includes: using a power stage for converting a DC input voltage into a DC output voltage, the power stage including an inductor; detecting whether the DC output voltage has an overshoot when the DC/DC converter is switched from a heavy loading into a light loading; when it is determined that the DC output voltage has the overshoot, forcing the DC/DC converter for additionally maintaining at a force continuous conduction mode (CCM) and thus discharging the DC output voltage by the inductor, and controlling the DC/DC converter switching from the force CCM into a discontinuous conductor mode (DCM).
    Type: Application
    Filed: April 26, 2019
    Publication date: July 23, 2020
    Inventors: Yi-Sheng CHEN, Yu-Shen LIN, Wei-Hsin WEI
  • Patent number: 10680463
    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.
    Type: Grant
    Filed: April 10, 2016
    Date of Patent: June 9, 2020
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei, Chih-Hsien Wang
  • Patent number: 10622900
    Abstract: Architecture and design techniques for a single inductor multiple-output (SIMO) DC-DC converter are presented. The SIMO DC-DC converter is based on ordered-power-distributive-control (OPDC) scheme with several novel control mechanism to optimize the performance of the power delivery capability, conversion efficiency and voltage ripple. In addition to buck mode outputs, the new SIMO DC-DC converter can also have an output channel operating at auto-buck-boost mode for the input voltage varying with the usage time.
    Type: Grant
    Filed: June 20, 2019
    Date of Patent: April 14, 2020
    Assignee: BravoTek Electronics Co., Ltd.
    Inventors: Wei-Hsin Wei, Yi-Cheng Hsu, Wei-Lun Hsieh
  • Patent number: 10601252
    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.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: March 24, 2020
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei, Chia-Hung Tsen
  • Patent number: 10291126
    Abstract: A single inductor multiple-output DC-DC converter includes an inductor coupled to a first input switch and a second input switch to store energy from supply source, wherein the first input switch is coupled to an input supply node, and the second input switch is coupled to ground, the first and the second switches controlling current through the inductor; a plurality of output switches, each output switch coupled to a common inductor node and to a corresponding output supply node, each of the output supply node having a voltage converted from an input voltage received at an input supply node; a freewheel switch coupled between the common inductor node and ground; a control circuit receiving a sensed inductor current and a plurality of feedback signals indicating error signals between output voltages and their corresponding reference voltages, the control circuit being configured to control timing and charging current of the inductor.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: May 14, 2019
    Assignee: BravoTek Electronics Co., Ltd.
    Inventors: Wei-Hsin Wei, Yi-Cheng Hsu, Wei-Lun Hsieh
  • Patent number: 10103620
    Abstract: In a SIBO boost converter, an inductor current flows from an input to ground through an inductor and a first switch to energize the inductor. The inductor releases energy stored thereof and the inductor current flows from the inductor to ground via a second switch and a first capacitor to charge the first capacitor and to produce a first positive output thereon. The inductor is energized by the input and the inductor current flows from the inductor to a third capacitor through two third switches to charge the third capacitor and to produce a second positive output thereon. The third capacitor is discharged through two fourth switches to charge a second capacitor of the capacitors to produce a negative output thereon. Timing for producing the second positive output is non-overlapped with timing for producing the negative output.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: October 16, 2018
    Assignee: BravoTek Electronics Co., Ltd.
    Inventor: Wei-Hsin Wei
  • Patent number: 10014778
    Abstract: Provided is a control method for controlling a SIBO buck-boost converter including a first switch coupled between an input and a first node, a second switch coupled between the first node and GROUND, a third switch coupled between a second node and GROUND, a fourth switch coupled between the second node and a first output node for outputting the positive output, a fifth switch coupled between the first node and a second output node for outputting the negative output, and an inductor coupled between the first node and the second node. The first and the third switches are turned on to energize the inductor. The first and the fourth switches are turned on to generate a positive output. The third and the fifth switches are turned on to generate a negative output.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: July 3, 2018
    Assignee: BRAVOTEK ELECTRONICS CO., LTD.
    Inventors: Wei-Hsin Wei, Yu-Shen Lin
  • Patent number: 9958886
    Abstract: A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit arranged to operably rectify the resonance signal; a current control unit, coupled with an output of the rectifying circuit, and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor, coupled with the output of the rectifying circuit, arranged to operably provide a DC output signal having a voltage level greater than that of the input signal; and a control circuit arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the DC output signal.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: May 1, 2018
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Publication number: 20180006496
    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.
    Type: Application
    Filed: May 5, 2017
    Publication date: January 4, 2018
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei, Chia-Hung Tsen
  • Patent number: 9853506
    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.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: December 26, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Patent number: 9853505
    Abstract: The present invention provides a resonant wireless power receiver circuit, including: a resonant circuit for receiving a wireless power to generate an AC resonant signal; a switch controlled rectifier circuit which includes a multi-mode switch circuit, for rectifying the AC resonant signal into a rectifier output signal to drive a load, wherein the multi-mode switch circuit includes at least one multi-mode switch; 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 at least one multi-mode switch such that it operates at least in a Resonance Short Circuit Operation to limit the rectifier output signal or to regulate the rectifier output signal. In the Resonance Short Circuit Operation, a positive resonant output node and a negative resonant output node are short-circuited by the multi-mode switch circuit.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: December 26, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Patent number: 9853486
    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.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: December 26, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Publication number: 20170351281
    Abstract: A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit arranged to operably rectify the resonance signal; a current control unit, coupled with an output of the rectifying circuit, and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor, coupled with the output of the rectifying circuit, arranged to operably provide a DC output signal having a voltage level greater than that of the input signal; and a control circuit arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the DC output signal.
    Type: Application
    Filed: August 24, 2017
    Publication date: December 7, 2017
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi LIU, Wei-Hsin WEI
  • Patent number: 9823675
    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.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: November 21, 2017
    Assignee: Richtek Technology Corporation
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Patent number: 9825525
    Abstract: A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate 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 coupled with an input of the rectifying circuit and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor coupled with an output 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 arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the DC output signal.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: November 21, 2017
    Assignee: Richtek Technology Corporation
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei
  • Publication number: 20170237341
    Abstract: A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate 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 coupled with an input of the rectifying circuit and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor coupled with an output 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 arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the DC output signal.
    Type: Application
    Filed: May 4, 2017
    Publication date: August 17, 2017
    Applicant: Richtek Technology Corporation
    Inventors: Kuo-Chi LIU, Wei-Hsin WEI
  • Publication number: 20170227974
    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.
    Type: Application
    Filed: October 4, 2016
    Publication date: August 10, 2017
    Applicant: Richtek Technology Corporation
    Inventors: Kuo-Chi LIU, Wei-Hsin WEI
  • Publication number: 20170085131
    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.
    Type: Application
    Filed: April 10, 2016
    Publication date: March 23, 2017
    Inventors: Kuo-Chi Liu, Wei-Hsin Wei, Chih-Hsien Wang