Patents by Inventor Chang-Yu Ho

Chang-Yu Ho 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).

  • Patent number: 11139670
    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.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: October 5, 2021
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Patent number: 10823785
    Abstract: The invention relates to a method for estimating the state of charge (SOC) of a battery when battery is in the at least states of: charging, discharging, and relaxing. The invention makes use of the battery voltage (VBAT) instead of the battery current. In order to build models in the method, we use standard charging and discharging processes to collect battery information.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: November 3, 2020
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventor: Chang-Yu Ho
  • Patent number: 10819209
    Abstract: A multi-source energy harvester system includes a power conversion apparatus. First and second energy harvesters respectively harvest first and second energy and respectively provide first and second input powers. The power conversion apparatus includes an adjustable impedance matching circuit and a power conversion circuit. The impedance matching circuit generates an adjusted power according to the first input power. The power conversion circuit converts a bus power to an output power. The energy harvester system controls a first and a second switch circuits according to the adjusted power and/or the second input power to select and conduct one of the adjusted power or the second input power as the bus power, and adjusts an impedance of the adjustable impedance matching circuit to maximize a voltage of the adjusted power.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: October 27, 2020
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20200285263
    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.
    Type: Application
    Filed: December 30, 2019
    Publication date: September 10, 2020
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Patent number: 10642301
    Abstract: A power conversion apparatus for tracking maximum power point, includes: a signal processing circuit, which generates a sensing signal at a sensing node according to an input voltage; and a comparison circuit, which controls a converter circuit according to a difference between the sensing signal and a reference voltage, to convert the input voltage to an output power. The signal processing circuit includes: a bias sensing circuit, which generates the sensing signal at the sensing node according to the input voltage; and a clamp circuit coupled to the sensing node, for clamping the sensing signal to be not greater than a clamp voltage. The converter circuit adjusts an output voltage and/or an output current of the output power, so that a power retrieval source operates near its maximum power point.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: May 5, 2020
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20200045773
    Abstract: A heating apparatus includes: first and second heaters, first and second switches, first and second ramp signal generation circuits, a signal processor circuit, first and second comparison circuits, and a switch control circuit. The first and second ramp signal generation circuits generate first and second ramp signals according to first and second output currents, respectively. The signal processor circuit senses a temperature to generate a temperature-related signal. The first and second comparison circuits compare the first and second ramp signals with the temperature-related signal, to generate a first PWM signal and a second PWM signal for controlling the first and second switches respectively, to determine the first and second output currents so that there is a predetermined ratio between average powers of the first heater and the second heater.
    Type: Application
    Filed: April 3, 2019
    Publication date: February 6, 2020
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20190386556
    Abstract: A multi-source energy harvester system includes a power conversion apparatus. First and second energy harvesters respectively harvest first and second energy and respectively provide first and second input powers. The power conversion apparatus includes an adjustable impedance matching circuit and a power conversion circuit. The impedance matching circuit generates an adjusted power according to the first input power. The power conversion circuit converts a bus power to an output power. The energy harvester system controls a first and a second switch circuits according to the adjusted power and/or the second input power to select and conduct one of the adjusted power or the second input power as the bus power, and adjusts an impedance of the adjustable impedance matching circuit to maximize a voltage of the adjusted power.
    Type: Application
    Filed: May 17, 2019
    Publication date: December 19, 2019
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20190317540
    Abstract: A power conversion apparatus for tracking maximum power point, includes: a signal processing circuit, which generates a sensing signal at a sensing node according to an input voltage; and a comparison circuit, which controls a converter circuit according to a difference between the sensing signal and a reference voltage, to convert the input voltage to an output power. The signal processing circuit includes: a bias sensing circuit, which generates the sensing signal at the sensing node according to the input voltage; and a clamp circuit coupled to the sensing node, for clamping the sensing signal to be not greater than a clamp voltage. The converter circuit adjusts an output voltage and/or an output current of the output power, so that a power retrieval source operates near its maximum power point.
    Type: Application
    Filed: February 20, 2019
    Publication date: October 17, 2019
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20190052110
    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.
    Type: Application
    Filed: July 26, 2018
    Publication date: February 14, 2019
    Inventors: Kuo-Chi Liu, Chang-Yu Ho
  • Publication number: 20180143153
    Abstract: The present invention provides a bio-cell detection apparatus and a bio detection method. The bio detection method includes: in absence of a biological reagent being introduced, pre-calibrating an initial value of a bio-cell detection chip. In absence of a sample to be tested in the bio-cell detection chip, introducing only the biological reagent into the bio-cell detection chip; and, measuring a first electrical parameter between a pair of opposing electrodes of the bio-cell detection chip. Introducing both the biological reagent and the sample to be tested into the bio-cell detection chip at the same time; and, measuring a second electrical parameter between the pair of opposing electrodes of the bio-cell detection chip. Comparing the second electrical parameter and the first electrical parameter, to determine whether a target biomolecule to be detected is present.
    Type: Application
    Filed: October 3, 2017
    Publication date: May 24, 2018
    Inventors: Chao-Shiun Wang, Chang-Yu Ho
  • Publication number: 20170343610
    Abstract: The invention relates to a method for estimating the state of charge (SOC) of a battery when battery is in the at least states of: charging, discharging, and relaxing. The invention makes use of the battery voltage (VBAT) instead of the battery current. In order to build models in the method, we use standard charging and discharging processes to collect battery information.
    Type: Application
    Filed: August 15, 2017
    Publication date: November 30, 2017
    Inventor: Chang-Yu Ho
  • Publication number: 20160018469
    Abstract: The invention relates to a method for estimating the state of charge (SOC) of a battery when battery is in the at least states of: charging, discharging, and relaxing. The invention makes use of the battery voltage (VBAT) instead of the battery current. In order to build models in the method, we use standard charging and discharging processes to collect battery information.
    Type: Application
    Filed: July 14, 2015
    Publication date: January 21, 2016
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventor: Chang-Yu Ho
  • Publication number: 20160018468
    Abstract: The invention relates to a method for estimating the state of charge (SOC) of a battery when battery is in the at least states of: charging, discharging, and relaxing. The invention makes use of the battery voltage (Vbat) instead of the battery current. In order to build models in the method, we use standard charging and discharging processes to collect battery information.
    Type: Application
    Filed: February 10, 2015
    Publication date: January 21, 2016
    Inventor: Chang-Yu Ho
  • Patent number: 8482254
    Abstract: A method of battery capacity measurement is actualized by battery internal resistance. This method establishes a controlled discharge path inside the battery module. The battery discharge current is a constant value despite of the variation of system loading current. The internal resistance measured by establishing this constant battery current can be used to obtain the battery capacity precisely.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: July 9, 2013
    Assignee: Neotec Semiconductor Ltd.
    Inventor: Chang-Yu Ho
  • Patent number: 8450973
    Abstract: A lithium battery module with multiple-cells connected in parallel is disclosed. The lithium battery module comprises a battery management unit, a power converter (optional) and each cell with an individual charging control switch and a discharging control switch in series connected with the cell and is independent controlled by the battery management unit so that a charger is capable of charging the designate cell or more or disable one among them.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: May 28, 2013
    Assignee: Neotec Semiconductor Ltd.
    Inventor: Chang-Yu Ho
  • Publication number: 20120112688
    Abstract: The battery module comprises a main battery, a voltage converter, an auxiliary device, a battery management unit and a first set of switching devices and a second set of switching devices. The main battery provides the electric power. The auxiliary device is used to store the electric power. The battery management unit controls the main battery and the auxiliary device to charge or discharge through a first set of switching devices and a second set of switching devices, respectively. When the battery module is charged by an external charger, the auxiliary device and the main battery are charged simultaneously. When the external charger stops to charge the battery module, the battery management unit controls the auxiliary device through the second set of switching devices to continuously charge the main battery through the voltage converter.
    Type: Application
    Filed: November 3, 2011
    Publication date: May 10, 2012
    Applicant: NEOTEC SEMICONDUCTOR LTD.
    Inventor: Chang-Yu Ho
  • Publication number: 20110193527
    Abstract: A lithium battery module with multiple-cells connected in parallel is disclosed. The lithium battery module comprises a battery management unit, a power converter (optional) and each cell with an individual charging control switch and a discharging control switch in series connected with the cell and is independent controlled by the battery management unit so that a charger is capable of charging the designate cell or more or disable one among them.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 11, 2011
    Applicant: NEOTEC SEMICONDUCTOR LTD.
    Inventor: Chang-Yu Ho
  • Publication number: 20110037475
    Abstract: A method of battery capacity measurement is actualized by battery internal resistance. This method establishes a controlled discharge path inside the battery module. The battery discharge current is a constant value despite of the variation of system loading current. The internal resistance measured by establishing this constant battery current can be used to obtain the battery capacity precisely.
    Type: Application
    Filed: August 10, 2010
    Publication date: February 17, 2011
    Applicant: NEOTEC SEMICONDUCTOR LTD.
    Inventor: Chang-Yu Ho
  • Patent number: 7847519
    Abstract: A battery protector with internal impedance compensation comprises: a logic circuit and delay module, an overcharge comparator, and an over-discharge comparator. The overcharge comparator has a positive terminal connected with a first adjustable reference signal and the over-discharge comparator has a negative terminal connected with a second adjustable reference signal and both of the other terminals of comparator are fed by the same partial voltage of the same voltage divider, which has two terminals, respectively, connected with the two electrodes of the battery. The first adjustable reference signal and the second adjustable reference are varied with the charging current or discharging current and the internal impedance of the battery.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: December 7, 2010
    Assignee: Neotec Semiconductor Ltd.
    Inventor: Chang-Yu Ho
  • Patent number: 7786695
    Abstract: A battery management system includes an external non-volatile memory and a battery management chip with embedded SRAM, CPU, ROM, and ROM_RAM encoder. The chip communicates with the non-volatile memory via standard protocols. While the battery management system is powered on or reset, a battery management program stored in the non-volatile memory is loaded to the embedded SRAM and the executed by CPU. As turning off this system, the program in the SRAM is then restored back the non-volatile memory. A battery protection IC is optionally embedded in the chip or externally connected with this chip to protect the battery from over-/under-voltage, over-current and short-circuit in both charge and discharge.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: August 31, 2010
    Assignee: Neotec Semiconductor Ltd.
    Inventors: Chang-Yu Ho, Hung-An Hsu, Sei-Ching Yang