Patents by Inventor Keng Chen

Keng Chen 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: 20210384821
    Abstract: A method of implementing a load line in a power converter includes: adjusting a target voltage used to regulate an output voltage of the power converter, based on sensed load current information that has delay between updates; and responsive to detecting a load current transient and before the next update to the sensed load current information becomes available, adjusting the target voltage based on blind load current information. A corresponding controller, power converter and electronic system are also described.
    Type: Application
    Filed: June 8, 2020
    Publication date: December 9, 2021
    Inventors: Keng Chen, Charles Amirault, James Garret
  • Publication number: 20210376724
    Abstract: A power converter includes a switch, an ON-time controller, and a compensator. Over multiple control cycles, the ON-time controller controls an ON-time duration of a control signal driving the switch. Activation of the switch generates an output voltage that powers a dynamic load. The ON-time controller controls attributes such as a switching frequency and/or an ON-time duration of the control signal driving the switch to regulate the output voltage. A phase-locked loop in the compensator supplies the ON-time controller with adjustment signals that adjust the ON-time duration of activating the switch to maintain the switching frequency at a desired setpoint. Thus, if a transient load condition causes the ON-time controller to temporarily operate the switch to at a value other than the desired setpoint frequency, the phase-locked loop of the compensator causes the switching frequency to align with the desired switching frequency again over one or more control cycles.
    Type: Application
    Filed: May 27, 2020
    Publication date: December 2, 2021
    Inventors: Keng Chen, James R. Garrett
  • Patent number: 11177730
    Abstract: An apparatus such as a DC-DC power converter including a switch, an ON-time controller, and a compensator operates in a constant ON-time control mode. Over multiple control cycles, the ON-time controller controls an ON-time duration of activating the switch and generation of an output voltage to power a dynamic load. The compensator, in communication with the ON-time controller, adjusts the ON-time duration of activating the switch depending on a magnitude of output current delivered by the output voltage to the dynamic load. For example, during heavier load conditions when the dynamic load consumes a higher amount of current, and in which internal resistive losses of the power supply become more substantial, the compensator increases the ON-time duration of activating the switch, resulting in operation of the power supply and switch closer to a desired frequency setpoint.
    Type: Grant
    Filed: October 17, 2019
    Date of Patent: November 16, 2021
    Assignee: Infineon Technologies Austria AG
    Inventors: Keng Chen, Luca Petruzzi
  • Publication number: 20210247788
    Abstract: A power supply includes a voltage converter to produce an output voltage to power a load. The power supply further includes a reference voltage generator and a controller. The reference voltage generator is operative to generate a floor reference voltage that varies as a function of the output voltage depending on a setting of one or more adjustable (programable) resistor-capacitor paths in the floor reference voltage generator. The controller produces control signals to control the voltage converter as a function of the floor reference voltage and the output voltage.
    Type: Application
    Filed: February 6, 2020
    Publication date: August 12, 2021
    Inventors: Keng Chen, Luca Petruzzi
  • Patent number: 11075577
    Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: July 27, 2021
    Assignee: Infineon Technologies Americas Corp.
    Inventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther
  • Publication number: 20210119524
    Abstract: An apparatus such as a DC-DC power converter including a switch, an ON-time controller, and a compensator operates in a constant ON-time control mode. Over multiple control cycles, the ON-time controller controls an ON-time duration of activating the switch and generation of an output voltage to power a dynamic load. The compensator, in communication with the ON-time controller, adjusts the ON-time duration of activating the switch depending on a magnitude of output current delivered by the output voltage to the dynamic load. For example, during heavier load conditions when the dynamic load consumes a higher amount of current, and in which internal resistive losses of the power supply become more substantial, the compensator increases the ON-time duration of activating the switch, resulting in operation of the power supply and switch closer to a desired frequency setpoint.
    Type: Application
    Filed: October 17, 2019
    Publication date: April 22, 2021
    Inventors: Keng Chen, Luca Petruzzi
  • Patent number: 10917011
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: February 9, 2021
    Assignee: Infineon Technologies Austria AG
    Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
  • Patent number: 10775817
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage error. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: September 15, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Paul Sisson, Keng Chen
  • Publication number: 20200220448
    Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.
    Type: Application
    Filed: March 17, 2020
    Publication date: July 9, 2020
    Inventors: Keng Chen, Luca Petruzzi
  • Patent number: 10651797
    Abstract: An apparatus includes a first amplifier, a second amplifier, and a compensation-setting generator to generate a first amplifier compensation setting and second amplifier compensation setting. A controller is operable to: i) apply the first amplifier compensation setting to the first amplifier and apply the second amplifier compensation setting to the second amplifier. The controller is further operable to switch between generating updates to the first amplifier compensation setting and the second amplifier compensation setting.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: May 12, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Keng Chen, Luca Petruzzi
  • Patent number: 10637342
    Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: April 28, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Keng Chen, Luca Petruzzi
  • Publication number: 20200021193
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Application
    Filed: September 24, 2019
    Publication date: January 16, 2020
    Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
  • Publication number: 20200007021
    Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 2, 2020
    Inventors: Keng Chen, Luca Petruzzi
  • Patent number: 10461641
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: October 29, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
  • Publication number: 20190312551
    Abstract: An apparatus includes a first amplifier, a second amplifier, and a compensation-setting generator to generate a first amplifier compensation setting and second amplifier compensation setting. A controller is operable to: i) apply the first amplifier compensation setting to the first amplifier and apply the second amplifier compensation setting to the second amplifier. The controller is further operable to switch between generating updates to the first amplifier compensation setting and the second amplifier compensation setting.
    Type: Application
    Filed: April 9, 2018
    Publication date: October 10, 2019
    Inventors: Keng Chen, Luca Petruzzi
  • Publication number: 20190273435
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Application
    Filed: March 1, 2018
    Publication date: September 5, 2019
    Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
  • Publication number: 20190271998
    Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage error. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.
    Type: Application
    Filed: March 1, 2018
    Publication date: September 5, 2019
    Inventors: Paul Sisson, Keng Chen
  • Patent number: 10327295
    Abstract: A multi string controller with independent current setting for each string is designed for solid state lighting applications. This controller can regulate multiple channels of LEDs. Each string may have a different forward voltage and current setting. A constant buck regulator is also integrated inside this controller to regulate the total current, which is fed into the LED output channels. The circuit also contains a feedback loop in order to precisely control the current passing through each string and is immune to transient conditions.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: June 18, 2019
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Andrew Johnsen, Keng Chen, Ming Li, Peng Xiao
  • Patent number: 10298123
    Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: May 21, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther
  • Publication number: 20190117826
    Abstract: A preparation at least useful as a bone implant, which contains a solid component including a lithium compound and a calcium compound. The preparation shows an anti-bacterial ability in comparison with a preparation contains the calcium compound but free of the lithium compound.
    Type: Application
    Filed: December 18, 2018
    Publication date: April 25, 2019
    Applicant: NATIONAL CHENG KUNG UNIVERSITY
    Inventors: Jiin-Huey Chern Lin, Chien-Ping Ju, Chang-Keng Chen, Bing-Chen Yang