Patents by Inventor Haoquan Zhang

Haoquan Zhang 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: 20240079958
    Abstract: In one example, an apparatus comprises: a primary side bridge coupled between a power input and a first ground terminal, the primary side bridge having first switching terminals coupled to first capacitor terminals; and a secondary side bridge coupled between a power output and a second ground terminal, the secondary side bridge having second switching terminals coupled to second capacitor terminals.
    Type: Application
    Filed: November 10, 2023
    Publication date: March 7, 2024
    Applicant: Texas Instruments Incorporated
    Inventors: Ashish Kumar, Haoquan Zhang, Yogesh Kumar Ramadass
  • Patent number: 11817779
    Abstract: Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).
    Type: Grant
    Filed: October 3, 2022
    Date of Patent: November 14, 2023
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ashish Kumar, Haoquan Zhang, Yogesh Kumar Ramadass
  • Publication number: 20230246607
    Abstract: A power generator includes a plurality of amplifier blocks and a combiner. Each of the amplifier blocks include one or more amplifiers, and the combiner combines modulated power signals output from the amplifier blocks to generate an RF power signal of a load. The amplifier blocks are controlled to outphase the modulated power signals based on a phase angle. Ones of the amplifier blocks may perform discrete modulation to generate a respective one of the modulated power signals. The discrete modulation includes selecting different combinations of the amplifiers in one or more of the amplifier blocks to change the RF power signal in discrete steps. In embodiments, the amplifiers may be radio frequency power amplifiers.
    Type: Application
    Filed: April 13, 2023
    Publication date: August 3, 2023
    Applicant: Massachusetts Institute of Technology
    Inventors: Haoquan Zhang, Anas Al Bastami, David J. Perreault
  • Patent number: 11664773
    Abstract: A power generator includes a plurality of amplifier blocks and a combiner. Each of the amplifier blocks include one or more amplifiers, and the combiner combines modulated power signals output from the amplifier blocks to generate an RF power signal of a load. The amplifier blocks are controlled to outphase the modulated power signals based on a phase angle. Ones of the amplifier blocks may perform discrete modulation to generate a respective one of the modulated power signals. The discrete modulation includes selecting different combinations of the amplifiers in one or more of the amplifier blocks to change the RF power signal in discrete steps. In embodiments, the amplifiers may be radio frequency power amplifiers.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: May 30, 2023
    Assignee: Massachusetts Institute of Technology
    Inventors: Haoquan Zhang, Anas Al Bastami, David J. Perreault
  • Publication number: 20230028100
    Abstract: Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).
    Type: Application
    Filed: October 3, 2022
    Publication date: January 26, 2023
    Inventors: Ashish Kumar, Haoquan Zhang, Yogesh Kumar Ramadass
  • Patent number: 11463000
    Abstract: Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).
    Type: Grant
    Filed: December 30, 2020
    Date of Patent: October 4, 2022
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ashish Kumar, Haoquan Zhang, Yogesh Kumar Ramadass
  • Publication number: 20220037123
    Abstract: A power generator includes a plurality of amplifier blocks and a combiner. Each of the amplifier blocks include one or more amplifiers, and the combiner combines modulated power signals output from the amplifier blocks to generate an RF power signal of a load. The amplifier blocks are controlled to outphase the modulated power signals based on a phase angle. Ones of the amplifier blocks may perform discrete modulation to generate a respective one of the modulated power signals. The discrete modulation includes selecting different combinations of the amplifiers in one or more of the amplifier blocks to change the RF power signal in discrete steps. In embodiments, the amplifiers may be radio frequency power amplifiers.
    Type: Application
    Filed: July 30, 2021
    Publication date: February 3, 2022
    Inventors: Haoquan ZHANG, Anas AL BASTAMI, David J. PERREAULT
  • Publication number: 20210305893
    Abstract: Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).
    Type: Application
    Filed: December 30, 2020
    Publication date: September 30, 2021
    Inventors: Ashish Kumar, Haoquan Zhang, Yogesh Kumar Ramadass