Patents by Inventor Jing-Meng Liu

Jing-Meng Liu 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: 20200357375
    Abstract: The present invention provides a device including a sound detector and a noise cancellation component. In the operations of the device, the sound detector is configured to receive an environment sound obtained from a microphone, and determine if the environment sound has a meaningful signal or not to generate a detection result; and the noise cancellation component is configured to perform a noise cancellation operation based on the detection result to generate an output signal to a speaker.
    Type: Application
    Filed: March 30, 2020
    Publication date: November 12, 2020
    Inventors: Kuan-Ta Chen, Nien-Hui Kung, Jing-Meng Liu
  • Publication number: 20190190278
    Abstract: A charger circuit converts a supply voltage of a DC power supply to a charging voltage and a charging current to charge a battery. A battery charging method includes: setting the supply voltage to an initial voltage; checking whether the charging voltage reaches a predetermined voltage level; when the charging voltage is lower than the predetermined voltage level, delivering a control signal to the DC power supply to reduce the supply voltage; when the charging voltage or the charging current is reduced accordingly, delivering the control signal to the DC power to increase the supply voltage; and repetitively reducing and/or increasing the supply voltage until the charging voltage reaches the predetermined voltage level.
    Type: Application
    Filed: September 18, 2018
    Publication date: June 20, 2019
    Inventors: Wei-Hsu Chang, Jing-Meng Liu, Ta-Yung Yang
  • Patent number: 10187941
    Abstract: A light emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.
    Type: Grant
    Filed: May 21, 2017
    Date of Patent: January 22, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventor: Jing-Meng Liu
  • Patent number: 10170923
    Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by a mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current; a monitor circuit arranged to operably detect the DC voltage or the cable current; and a data processing circuit configured for controlling the power converting circuit according to the communication signal. The data processing circuit further communicates with the mobile device through the terminal communication interface and the connection terminal in response to a detection result of the monitor circuit.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: January 1, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Ta-Yung Yang, Jing-Meng Liu, Isaac Y. Chen, Tzu-Chen Lin
  • Publication number: 20180233937
    Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by a mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current; a monitor circuit arranged to operably detect the DC voltage or the cable current; and a data processing circuit configured for controlling the power converting circuit according to the communication signal. The data processing circuit further communicates with the mobile device through the terminal communication interface and the connection terminal in response to a detection result of the monitor circuit.
    Type: Application
    Filed: April 12, 2018
    Publication date: August 16, 2018
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Ta-Yung YANG, Jing-Meng LIU, Isaac Y. CHEN, Tzu-Chen LIN
  • Patent number: 9979214
    Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: May 22, 2018
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Ta-Yung Yang, Jing-Meng Liu, Isaac Y. Chen, Tzu-Chen Lin
  • Patent number: 9800078
    Abstract: The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: October 24, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Jing-Meng Liu, Li-Wei Lee, Ta-Yung Yang
  • Publication number: 20170257920
    Abstract: Alight emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.
    Type: Application
    Filed: May 21, 2017
    Publication date: September 7, 2017
    Inventor: Jing-Meng Liu
  • Publication number: 20170201107
    Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.
    Type: Application
    Filed: February 2, 2016
    Publication date: July 13, 2017
    Applicant: Richtek Technology Corporation
    Inventors: Ta-Yung YANG, Jing-Meng LIU, Isaac Y. CHEN, Tzu-Chen LIN
  • Publication number: 20170201101
    Abstract: An adaptive charging voltage generator of a mobile device charger includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the mobile device charger and for receiving a communication signal generated by the mobile device from the connection terminal; a buck converter for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a charging voltage control circuit coupled with the buck converter and configured for controlling the buck converter according to the communication signal.
    Type: Application
    Filed: February 2, 2016
    Publication date: July 13, 2017
    Applicant: Richtek Technology Corporation
    Inventors: Ta-Yung YANG, Jing-Meng LIU, Isaac Y. CHEN, Tzu-Chen LIN
  • Patent number: 9686829
    Abstract: A light emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: June 20, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventor: Jing-Meng Liu
  • Patent number: 9629214
    Abstract: The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: April 18, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chiawei Liao, Jing-Meng Liu
  • Publication number: 20160218617
    Abstract: The present invention discloses a power supply circuit with power factor correction (PFC) function, and an automatic gain control circuit therefor and a control method thereof. The power supply circuit includes the automatic gain control circuit and a load driver circuit. The automatic gain control circuit converts an input voltage to a regulation voltage, and the load driver circuit generates an output current according to the regulation voltage. The automatic gain control circuit automatically adjust the regulation voltage such that the regulation voltage has a substantially fixed amplitude or fixed average value under different input voltages of different specifications, and the output current provided by the load driver circuit varies in phase with the input voltage to provide a PFC function.
    Type: Application
    Filed: April 6, 2016
    Publication date: July 28, 2016
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chia-Wei Liao, Jing-Meng Liu
  • Publication number: 20160134135
    Abstract: The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.
    Type: Application
    Filed: November 5, 2015
    Publication date: May 12, 2016
    Inventors: Jing-Meng Liu, Li-Wei Lee
  • Patent number: 9337716
    Abstract: The present invention discloses a power supply circuit with power factor correction (PFC) function, and an automatic gain control circuit therefor and a control method thereof. The power supply circuit includes the automatic gain control circuit and a load driver circuit. The automatic gain control circuit converts an input voltage to a regulation voltage, and the load driver circuit generates an output current according to the regulation voltage. The automatic gain control circuit automatically adjust the regulation voltage such that the regulation voltage has a substantially fixed amplitude or fixed average value under different input voltages of different specifications, and the output current provided by the load driver circuit varies in phase with the input voltage to provide a PFC function.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: May 10, 2016
    Assignee: RICHTEK TECHNOLOGY CORPORATION, R.O.C.
    Inventors: Chia-Wei Liao, Jing-Meng Liu
  • Patent number: 9306443
    Abstract: The invention provides an analog photovoltaic power circuit with auto zero calibration, which judges whether the current trend or voltage trend has the same direction as or different direction from the power trend, and adjusts an input/output power conversion accordingly, so that an input current approaches to an optimum current corresponding to a maximum power point, in which the judgments of the current trend, voltage trend and power trend is calibrated with auto-zero circuitry.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: April 5, 2016
    Assignee: RICHTEK TECHNOLOGY CORPORATION, R.O.C
    Inventor: Jing-Meng Liu
  • Patent number: 9287796
    Abstract: The present invention discloses an isolated power converter circuit and a control method thereof. The isolated power converter circuit includes: a transformer circuit, a power switch circuit, an opto-coupler circuit, and a control circuit. The transformer circuit includes a first winding and a second winding. The power switch circuit is coupled to the transformer circuit to control it according to a driving signal. The opto-coupler circuit generates a feedback signal. The control circuit is coupled to the power switch circuit and the opto-coupler circuit, for generating the driving signal according to the feedback signal. The control circuit includes a distinguishing circuit for distinguishing a status of the feedback signal.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: March 15, 2016
    Assignee: Richtek Technology Corporation, R.O.C.
    Inventors: Chia-Wei Liao, Jing-Meng Liu
  • Patent number: 9179517
    Abstract: The present invention discloses a backlight control circuit, comprising: a voltage supply circuit for receiving an input voltage and generating an output voltage under control by a control signal; at least one voltage comparison path respectively coupled to at least one light emission device path; a voltage operative amplifier circuit for generating the control signal according to a lowest voltage on the at least one voltage comparison path; and at least one under current detection circuit for detecting whether a corresponding one of the at least one light emission device path is in an under current status, whereby when anyone of the under current detection circuits detects the under current status, it sends an exclusion signal excluding a corresponding one of the at least one voltage comparison path from being an effective input of the voltage operative amplifier.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: November 3, 2015
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chiawei Liao, Jing-Meng Liu
  • Publication number: 20150257228
    Abstract: The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
    Type: Application
    Filed: May 20, 2015
    Publication date: September 10, 2015
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chiawei Liao, Jing-Meng Liu
  • Patent number: 9106132
    Abstract: A boundary conduction mode (BCM) switching regulator controls a power stage to convert an input voltage to an output voltage or output current. The BCM switching regulator detects whether it is operating in continuous conduction mode (CCM) or discontinuous conduction mode (DCM), and adjusts the On-time, Off-time, or frequency of the power stage accordingly, so that the switching regulator operates in or near BCM.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: August 11, 2015
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventor: Jing-Meng Liu