Patents by Inventor Hsuan-Kai Wang

Hsuan-Kai Wang 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: 20200275030
    Abstract: An optical measurement equipment includes an adjustment apparatus and at least two image capturing devices. The image capturing devices have a depth-of-field and attached to the adjustment apparatus. The image capturing devices are adjusted by the adjustment apparatus such that a portion to be measured of a workpiece is located within the depth-of-field of the image capturing devices.
    Type: Application
    Filed: February 25, 2019
    Publication date: August 27, 2020
    Applicant: Advanced Semiconductor Engineering, Inc.
    Inventors: Ming-Han WANG, Ian HU, Meng-Kai SHIH, Hsuan Yu CHEN
  • Publication number: 20140354050
    Abstract: The present invention discloses a power bank and a control method for supplying power. The power bank includes a rechargeable battery, a charging switch for controlling a charging path to the rechargeable battery, a discharging switch for controlling a discharging path from the rechargeable battery, and a control circuit for controlling the charging switch and the discharging switch according to current information of the charging path, current information of the discharging path, and battery capacity information of the rechargeable battery. The power bank is adapted for being connected in series between a power supply apparatus and a load. The control method detects the supply current from the power supply apparatus and the current required by the load to determine the charging and discharging operations of the power bank.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 4, 2014
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Nien-Hui Kung, Hsuan-Kai Wang
  • Patent number: 8653795
    Abstract: The present invention discloses a charger circuit. The charger circuit comprises a control circuit and at least two charging paths. The control circuit determines to activate or inactivate each charging path according to a battery feedback signal representing the charging status. Accordingly, the battery is charged by input power in an optimal way so that the charging efficiency is improved and the overheating problem is solved.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: February 18, 2014
    Assignee: Richtek Technology Corporation, R.O.C.
    Inventors: Hsuan-Kai Wang, Nien-Hui Kung, Wei-I Li
  • Publication number: 20130181522
    Abstract: A power management control circuit controls a first power transistor to convert a input voltage to an output voltage and controls a second power transistor to charge a battery from the output voltage. The first power transistor is coupled between the input voltage and the output voltage, and the second power transistor is coupled between the output voltage and the battery. The power management control circuit includes: a detection transistor detecting a current through the second power transistor and generating a charging reference voltage; an amplifier comparing the output voltage with the voltage of the battery to generate an amplified signal for controlling the charging reference voltage; a comparator comparing a reference voltage with the charging reference voltage to generate an EOC (End of Charge) signal for determining whether to stop charging the battery; and an offset voltage compensation device compensating an input offset voltage of the amplifier.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 18, 2013
    Inventors: Hsuan-Kai Wang, Nien-Hui Kung
  • Publication number: 20130181683
    Abstract: The present invention discloses a battery charging circuit adjusting a charging voltage or a charging current according to a battery temperature, which includes: a power stage circuit including at least one power transistor switch and converting input power to charging power by operating the power transistor switch within a temperature range, wherein the charging power includes the charging voltage and the charging current; a reference signal generator obtaining signals representing the battery temperature and generating a reference signal accordingly; and a control circuit generating a switch signal according to the reference signal for operating the power transistor of the power stage circuit, wherein the charging voltage or the charging current is gradually increased as the battery temperature increases in a lower range within the temperature range or gradually decreased as the battery temperature increases in a higher range within the temperature range.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 18, 2013
    Inventors: Hsuan-Kai Wang, Nien-Hui Kung, Chieh-Wei Chen
  • Patent number: 8378640
    Abstract: A charging circuit with an application system thereof provides an error amplifier to control a transistor switch for controlling the charging power source to charges the battery. When the voltage difference between the power source and load terminals of the transistor switch drops along with the transistor switch being turned on, the output voltage of the error amplifier changes as well to increase the turning-on resistance of the transistor switch such that the voltage difference between the power source and load terminals is capable of maintaining at a value above a certain reference level for avoiding the unstable state resulting from the charging circuit being turned on and off frequently.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: February 19, 2013
    Assignee: Richtek Technology Corp.
    Inventors: Li-Wei Lee, Nien-Hui Kung, Kwan-Jen Chu, Hsuan-Kai Wang
  • Patent number: 8283974
    Abstract: A fast start-up low-voltage bandgap reference voltage generator uses two current generators to provide a first current having a positive temperature coefficient and a second current having a negative temperature coefficient, respectively, and a resistor to generate a temperature independent output voltage according to the sum of the first and second currents. The current generator for providing the first current has a self-bias circuit which uses a single MOSFET to establish the first current, and thereby avoids error caused by mismatched MOSFETs.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: October 9, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Nien-Hui Kung, Hsuan-Kai Wang
  • Publication number: 20120249085
    Abstract: An exemplary method for controlling a charging current is adapted to a charging device. The charging device receives an input voltage to thereby output the charging current. The method includes the following steps of: making the charging current have a first value; judging whether the input voltage is less than a preset reference voltage; and if the input voltage is judged to be less than the preset reference voltage, decreasing the charging current from the first value step by step until the input voltage retrieves back above the preset reference voltage.
    Type: Application
    Filed: July 13, 2011
    Publication date: October 4, 2012
    Applicant: RICHTEK TECHNOLOGY CORP
    Inventors: Chia-Hsiang Lin, Li-Wei Lee, Chen-Hsiang Hsiao, Hsuan-Kai Wang
  • Publication number: 20120169294
    Abstract: A circuit and method for power path management track the input voltage at a power input terminal to generate a reference voltage, and generate a control signal for controlling a charger control circuit coupled between a power output terminal and a charger output terminal according to the difference between the voltage at the power output terminal and the reference voltage.
    Type: Application
    Filed: December 30, 2011
    Publication date: July 5, 2012
    Applicant: Richtek Technology Corp.
    Inventors: Hsuan-Kai WANG, Nien-Hui KUNG, Chia-Hsiang LIN
  • Publication number: 20120112705
    Abstract: The present invention discloses a charger circuit. The charger circuit comprises a control circuit and at least two charging paths. The control circuit determines to activate or inactivate each charging path according to a battery feedback signal representing the charging status. Accordingly, the battery is charged by input power in an optimal way so that the charging efficiency is improved and the overheating problem is solved.
    Type: Application
    Filed: May 26, 2011
    Publication date: May 10, 2012
    Inventors: Hsuan-Kai Wang, Nien-Hui Kung, Wei-I Li
  • Publication number: 20110169561
    Abstract: A fast start-up low-voltage bandgap reference voltage generator uses two current generators to provide a first current having a positive temperature coefficient and a second current having a negative temperature coefficient, respectively, and a resistor to generate a temperature independent output voltage according to the sum of the first and second currents. The current generator for providing the first current has a self-bias circuit which uses a single MOSFET to establish the first current, and thereby avoids error caused by mismatched MOSFETs.
    Type: Application
    Filed: January 4, 2011
    Publication date: July 14, 2011
    Applicant: RICHTEK TECHNOLOGY CORP.
    Inventors: KWAN-JEN CHU, NIEN-HUI KUNG, HSUAN-KAI WANG
  • Publication number: 20110012565
    Abstract: A charging circuit with an application system thereof provides an error amplifier to control a transistor switch for controlling the charging power source to charges the battery. When the voltage difference between the power source and load terminals of the transistor switch drops along with the transistor switch being turned on, the output voltage of the error amplifier changes as well to increase the turning-on resistance of the transistor switch such that the voltage difference between the power source and load terminals is capable of maintaining at a value above a certain reference level for avoiding the unstable state resulting from the charging circuit being turned on and off frequently.
    Type: Application
    Filed: December 7, 2009
    Publication date: January 20, 2011
    Applicant: Richteck Technology Corp.
    Inventors: Li-Wei LEE, Nien-Hui KUNG, Kwan-Jen CHU, Hsuan-Kai WANG