Patents by Inventor Kaiwei Yao

Kaiwei Yao 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: 11824434
    Abstract: An integrated driver applied to a voltage converter having a switched capacitor conversion circuit, the integrated driver including: a first die having a first-type power transistor; a second die including at least one second-type power transistor, where a withstand voltage of the first-type power transistor is higher than a withstand voltage of the second-type power transistor; and where the first die and the second die are coupled in series between a high potential terminal and a low potential terminal of the voltage converter, such that the first-type power transistor receives a high voltage signal.
    Type: Grant
    Filed: June 21, 2021
    Date of Patent: November 21, 2023
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Kaiwei Yao, Wang Zhang, Chen Zhao
  • Patent number: 11824450
    Abstract: A power converter can include: N switching power stage circuits, where output terminals of the N switching power stage circuits are connected in parallel, and N is a positive integer; an energy storage element coupled between an input terminal and the output terminal of the power converter, where the energy storage element is configured to periodically store energy for delivery to the output terminal of the power converter; and where after a main transistor of an M-th switching power stage circuit is turned off, a main transistor of the (M+1)-th switching power stage circuit is turned on, in order to realize zero-voltage-switching (ZVS) of the main transistor of (M+1)-th switching power stage circuit, where M is a positive integer less than N.
    Type: Grant
    Filed: June 14, 2021
    Date of Patent: November 21, 2023
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Kaiwei Yao, Wang Zhang, Chen Zhao
  • Publication number: 20230198392
    Abstract: An auxiliary circuit of a power converter is disclosed, where: the auxiliary circuit is coupled to a load of the power converter; and the auxiliary circuit is configured to generate an auxiliary current provided to the load, in order to limit a variation range of a load voltage of the load when a variation of an output signal of the power converter is greater than a predetermined value.
    Type: Application
    Filed: December 12, 2022
    Publication date: June 22, 2023
    Inventors: Kaiwei Yao, David Tournatory, Mike Grimm
  • Patent number: 11682964
    Abstract: A driving circuit and a driving method are provided. The driving circuit includes an energy-storage capacitor, a first power converter and a bidirectional converter. An output port of the first power converter is coupled to a load and the energy-storage capacitor. The energy-storage capacitor is connected in parallel with the load. The bidirectional converter is coupled between the load and the energy-storage capacitor. The first power converter supplies power to the load during a light load interval. During at least a part of the light load interval, the first power converter charges the energy-storage capacitor via the bidirectional converter. During a heavy load interval, the first power converter supplies power to the load and the energy-storage capacitor supplies power to the load via the bidirectional converter. The driving circuit is applicable to drive a load requiring low average power and high peak power.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: June 20, 2023
    Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD
    Inventor: Kaiwei Yao
  • Patent number: 11677306
    Abstract: A method of inductor current reconstruction for a power converter can include: acquiring at least one of a current that represents a current flowing through a main power transistor, and a current that represents a current flowing through a rectifier transistor, in order to generate a switching current sampling signal in the power converter; and generating an inductor current reconstruction signal representing an inductor current in one complete switching cycle according to the switching current sampling signal and an inductor voltage signal representing a voltage across an inductor in the power converter.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: June 13, 2023
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Chiqing Fang, Zhiwei Xu, Kaiwei Yao, Chen Zhao
  • Patent number: 11652417
    Abstract: A concentration control circuit can include: a voltage feedback circuit configured to generate a current reference signal representing an error between a voltage reference signal and an output voltage feedback signal shared by each of a plurality of power stage circuits of a multi-phase power converter to adjust a respective phase current; and a clock signal generation circuit configured to generate a clock signal to adjust at least one of switching frequency and phase of each of the power stage circuits, where the clock signal is adjusted in accordance with a change of the current reference signal.
    Type: Grant
    Filed: March 25, 2022
    Date of Patent: May 16, 2023
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Zhiyuan Shen, Kaiwei Yao
  • Publication number: 20230123031
    Abstract: A method of controlling a multi-phase power converter having a plurality of power stage circuits coupled in parallel, can include: obtaining a load current of the multi-phase power converter; enabling corresponding power stage circuits to operate in accordance with the load current, such that a switching frequency is maintained within a predetermined range when the load current changes; and controlling the power stage circuits to operate under different modes in accordance with the load current, such that the switching frequency is maintained within the predetermined range when the load current changes.
    Type: Application
    Filed: December 22, 2022
    Publication date: April 20, 2023
    Inventors: Kaiwei Yao, Zhiyuan Shen
  • Patent number: 11581812
    Abstract: A method of controlling a multi-phase power converter having a plurality of power stage circuits coupled in parallel, can include: obtaining a load current of the multi-phase power converter; enabling corresponding power stage circuits to operate in accordance with the load current, such that a switching frequency is maintained within a predetermined range when the load current changes; and controlling the power stage circuits to operate under different modes in accordance with the load current, such that the switching frequency is maintained within the predetermined range when the load current changes.
    Type: Grant
    Filed: June 7, 2020
    Date of Patent: February 14, 2023
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Kaiwei Yao, Zhiyuan Shen
  • Publication number: 20220311338
    Abstract: An inductor current reconstruction circuit of a power converter can include: a switching current sampling circuit configured to acquire at least one of a current flowing through a main power transistor and a current flowing through a rectifier transistor to generate a switching current sampling signal; an inductor current generating circuit configured to generate a reconstruction signal representing an inductor current in one complete switching cycle; and where the reconstruction signal comprises the switching current sampling signal and a current analog signal generated according to the switching current sampling signal and an inductor voltage signal representing a voltage across an inductor in the power converter.
    Type: Application
    Filed: March 22, 2022
    Publication date: September 29, 2022
    Inventors: Chiqing Fang, Zhiwei Xu, Kaiwei Yao, Chen Zhao
  • Publication number: 20220216794
    Abstract: A concentration control circuit can include: a voltage feedback circuit configured to generate a current reference signal representing an error between a voltage reference signal and an output voltage feedback signal shared by each of a plurality of power stage circuits of a multi-phase power converter to adjust a respective phase current; and a clock signal generation circuit configured to generate a clock signal to adjust at least one of switching frequency and phase of each of the power stage circuits, where the clock signal is adjusted in accordance with a change of the current reference signal.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 7, 2022
    Inventors: Zhiyuan Shen, Kaiwei Yao
  • Patent number: 11374484
    Abstract: A multi-phase power supply includes a plurality of phase controllers each driving a first terminal of a respective inductor alternatively between an input voltage and a ground voltage to regulate an output voltage in a work mode, keeping the first terminal of the respective inductor in a high impedance state during a non-work mode, having an input for receiving an enable signal for selecting between the work mode and the non-work mode, and generating a current monitor signal to represent a current through the respective inductor during both the work mode and the non-work mode, and a controller coupled to each phase controller for selectively enabling respective ones of the phase controllers in response to a load demand, receiving the current monitor signal from each phase controller, and selectively shutting down the multi-phase power supply when a total of current monitor signals from the phase controller exceeds a threshold.
    Type: Grant
    Filed: December 2, 2020
    Date of Patent: June 28, 2022
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Enzhu Liang, Kaiwei Yao, Ming Gu
  • Patent number: 11336187
    Abstract: A resonant switching converter can include: a voltage switching circuit configured to receive a first input voltage, and to generate a second input voltage of a resonant branch coupled to the voltage switching circuit; where when the voltage switching circuit is in a first operating state, the second input voltage provided to the resonant branch is less than the first input voltage; and where when the voltage switching circuit is in a second operating state, the input voltage provided to the resonant branch is zero.
    Type: Grant
    Filed: January 7, 2021
    Date of Patent: May 17, 2022
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Chiqing Fang, Kaiwei Yao, Chen Zhao
  • Patent number: 11316431
    Abstract: A concentration control circuit can include: a voltage feedback circuit configured to generate a current reference signal representing an error between a voltage reference signal and an output voltage feedback signal shared by each of a plurality of power stage circuits of a multi-phase power converter to adjust a respective phase current; and a clock signal generation circuit configured to generate a clock signal to adjust at least one of switching frequency and phase of each of the power stage circuits, where the clock signal is adjusted in accordance with a change of the current reference signal.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: April 26, 2022
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Zhiyuan Shen, Kaiwei Yao
  • Patent number: 11264915
    Abstract: An AC-DC converter can include: a rectifying circuit configured to convert an AC input voltage into a DC voltage, where at least one active switching device is included in one conductive rectifying loop of the rectifying circuit; a control circuit configured to control switching states of the active switching devices according to an output voltage of the AC-DC converter and the AC input voltage, in order to decrease an error between the DC voltage and the output voltage of the AC-DC converter; and a DC-DC converter configured to convert the DC voltage into the output voltage of the AC-DC converter.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: March 1, 2022
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Jian Deng, Kaiwei Yao
  • Publication number: 20220052597
    Abstract: A driving circuit and a driving method are provided. The driving circuit includes an energy-storage capacitor, a first power converter and a bidirectional converter. An output port of the first power converter is coupled to a load and the energy-storage capacitor. The energy-storage capacitor is connected in parallel with the load. The bidirectional converter is coupled between the load and the energy-storage capacitor. The first power converter supplies power to the load during a light load interval. During at least a part of the light load interval, the first power converter charges the energy-storage capacitor via the bidirectional converter. During a heavy load interval, the first power converter supplies power to the load and the energy-storage capacitor supplies power to the load via the bidirectional converter. The driving circuit is applicable to drive a load requiring low average power and high peak power.
    Type: Application
    Filed: August 12, 2021
    Publication date: February 17, 2022
    Inventor: Kaiwei YAO
  • Patent number: 11251711
    Abstract: A current control circuit for a power converter can include: a sense transistor coupled to a power transistor to be sensed; and a control circuit configured to control a voltage at a power terminal of the sense transistor in order to mirror a current flowing through the power transistor, to control the sense transistor to generate a sense current, and to generate a control signal for controlling operation states of the power transistor in accordance with the sense current and a reference current.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: February 15, 2022
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Kaiwei Yao
  • Publication number: 20210408891
    Abstract: An integrated driver applied to a voltage converter having a switched capacitor conversion circuit, the integrated driver including: a first die having a first-type power transistor; a second die including at least one second-type power transistor, where a withstand voltage of the first-type power transistor is higher than a withstand voltage of the second-type power transistor; and where the first die and the second die are coupled in series between a high potential terminal and a low potential terminal of the voltage converter, such that the first-type power transistor receives a high voltage signal.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 30, 2021
    Inventors: Kaiwei Yao, Wang Zhang, Chen Zhao
  • Patent number: 11209464
    Abstract: A current detection circuit can include: a detection power switch coupled to a power switch to be detected; a current control circuit configured to control voltages of power terminals of the detection power switch in order to generate a detection current flowing through the detection power switch when the power switch is on; and where a flowing direction of the detection current is consistent with a flowing direction of a current flowing through the power switch.
    Type: Grant
    Filed: April 10, 2020
    Date of Patent: December 28, 2021
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventor: Kaiwei Yao
  • Publication number: 20210399642
    Abstract: A power converter can include: N switching power stage circuits, where output terminals of the N switching power stage circuits are connected in parallel, and N is a positive integer; an energy storage element coupled between an input terminal and the output terminal of the power converter, where the energy storage element is configured to periodically store energy for delivery to the output terminal of the power converter; and where after a main transistor of an M-th switching power stage circuit is turned off, a main transistor of the (M+1)-th switching power stage circuit is turned on, in order to realize zero-voltage-switching (ZVS) of the main transistor of (M+1)-th switching power stage circuit, where M is a positive integer less than N.
    Type: Application
    Filed: June 14, 2021
    Publication date: December 23, 2021
    Inventors: Kaiwei Yao, Wang Zhang, Chen Zhao
  • Publication number: 20210351687
    Abstract: A method of inductor current reconstruction for a power converter can include: acquiring at least one of a current that represents a current flowing through a main power transistor, and a current that represents a current flowing through a rectifier transistor, in order to generate a switching current sampling signal in the power converter; and generating an inductor current reconstruction signal representing an inductor current in one complete switching cycle according to the switching current sampling signal and an inductor voltage signal representing a voltage across an inductor in the power converter.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 11, 2021
    Inventors: Chiqing Fang, Zhiwei Xu, Kaiwei Yao, Chen Zhao