Patents by Inventor Xiaokang Wu

Xiaokang Wu 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: 10725938
    Abstract: An auto-loop regulation system for a voltage regulator receives a plurality of pre-determined loop parameters through an interactive computing equipment, and the voltage regulator operates according to the plurality of pre-determined loop parameters, wherein the interactive computing equipment regulates at least one of the loop parameters automatically in real time according to an online loop value when the voltage regulator is operating online, and the interactive computing equipment keeps regulating the loop parameters until the online value of the voltage regulator matches with a target value.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: July 28, 2020
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang
  • Patent number: 10673336
    Abstract: A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a reference voltage and the high-pass filtered signal to generate a set signal. The logic control circuit generates a control signal based on the set signal to control the switching circuit.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: June 2, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lijie Jiang, Xiaokang Wu, Binci Xu
  • Patent number: 10651721
    Abstract: A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases to the initial value with a preset slew rate.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: May 12, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Xiaokang Wu, Lijie Jiang, Suhua Luo
  • Patent number: 10620677
    Abstract: An autonomous power system has a voltage regulator which converts an input voltage to an output voltage according to a reference voltage. A control method for the power system: receiving a voltage identification code sent by a processor; providing an autonomous voltage identification code when the voltage identification sent by the processor keeps constant during a first preset duration, wherein the autonomous voltage identification code can be updated self-adaptively; providing a reference voltage according to a sum of the voltage identification code and the autonomous identification code; and adjusting the output voltage according to the reference voltage.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: April 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Reagan Luo, Qian Ouyang, Lijie Jiang, Marvin Ma, Xiaokang Wu
  • Patent number: 10581254
    Abstract: An equalization current adjustment method includes: determining a battery unit to be equalized in a battery pack, and obtaining a current actual equalization current value of the battery unit; and when it is determined that a difference between the current actual equalization current value of the battery unit and a target equalization current value does not fall within a range of a preset threshold, adjusting a fundamental amplitude of an alternating current power supply of a target circuit on which the battery unit is located and/or a voltage gain of the target circuit, so that the difference between the current actual equalization current value of the battery unit and the target equalization current value falls within the range of the preset threshold.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: March 3, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Rui Yang, Xiaokang Liu, Zhiwei Wu
  • Publication number: 20200007023
    Abstract: A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases to the initial value with a preset slew rate.
    Type: Application
    Filed: June 26, 2019
    Publication date: January 2, 2020
    Inventors: Xiaokang Wu, Lijie Jiang, Suhua Luo
  • Patent number: 10498241
    Abstract: A control method of multi-phase converters, wherein the multi-phase converter includes a plurality of switching circuits coupled in parallel between an input voltage and a load. The control method includes: comparing a feedback signal with a reference signal to generate a comparison signal, wherein the feedback signal is indicative of an output voltage provided to the load; determining the number of switching circuits for power operation based on the load current; detecting a period of the comparison signal; comparing the detected period of the comparison signal with a time threshold to determine whether a transient rise of load current has occurred; and getting all the switching circuits into power operation if a transient rise of load current is detected.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: December 3, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Xiaokang Wu, Lijie Jiang, Binci Xu
  • Patent number: 10468973
    Abstract: An over current protecting circuit, used with a switching converter having a switch, having: a current limiting circuit, configured to receive a limit indicating signal and to provide an on time signal to control an on time period of the switch based on the limit indicating signal, wherein if the limit indicating signal indicates a current flowing through the switch of the switching converter is larger than a limiting threshold, the on time period of a next switching cycle of the switch is subtracted with a first period, otherwise, the on time period of the switch of the next switching cycle is added with a second period; wherein a maximum on time period of the switch is fixed to be an on time reference.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: November 5, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Xiaokang Wu, Qian Ouyang, Yu Zhang, Xiaogang Wei
  • Patent number: 10361568
    Abstract: An energy balancing apparatus and method, and a terminal are provided in the battery field. The apparatus may include a controlled alternating current energy supply, an alternating current energy distribution circuit, filter circuits, rectifier circuits, and a balance control circuit. The controlled alternating current energy supply and an input port of the alternating current energy distribution circuit are connected in parallel, each output port of the alternating current energy distribution circuit and an input side of a corresponding filter circuit are connected in parallel, an output side of each filter circuit and an alternating current side of a corresponding rectifier circuit are connected in parallel, a direct current side of each rectifier circuit and a corresponding battery cell are connected in parallel, each battery cell is connected to the balance control circuit, and the balance control circuit is connected to the controlled alternating current energy supply.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: July 23, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Rui Yang, Xiaokang Liu, Zhiwei Wu
  • Patent number: 10348197
    Abstract: A DC-DC converter with transient control. The DC-DC converter includes a power switching circuit, a current to voltage converter, a PI circuit 403, a voltage to current converter 404 and a logic and control circuit 405. The DC-DC converter obtains the transient information of a current flowing through the power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: July 9, 2019
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Chao Liu, Lijie Jiang, Qian Ouyang, Xiaokang Wu
  • Publication number: 20190207518
    Abstract: A control method of multi-phase converters, wherein the multi-phase converter includes a plurality of switching circuits coupled in parallel between an input voltage and a load. The control method includes: comparing a feedback signal with a reference signal to generate a comparison signal, wherein the feedback signal is indicative of an output voltage provided to the load; determining the number of switching circuits for power operation based on the load current; detecting a period of the comparison signal; comparing the detected period of the comparison signal with a time threshold to determine whether a transient rise of load current has occurred; and getting all the switching circuits into power operation if a transient rise of load current is detected.
    Type: Application
    Filed: December 20, 2018
    Publication date: July 4, 2019
    Inventors: Xiaokang Wu, Lijie Jiang, Binci Xu
  • Publication number: 20190199212
    Abstract: A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a reference voltage and the high-pass filtered signal to generate a set signal. The logic control circuit generates a control signal based on the set signal to control the switching circuit.
    Type: Application
    Filed: December 13, 2018
    Publication date: June 27, 2019
    Inventors: Lijie Jiang, Xiaokang Wu, Binci Xu
  • Publication number: 20190129868
    Abstract: An auto-loop regulation system for a voltage regulator receives a plurality of pre-determined loop parameters through an interactive computing equipment, and the voltage regulator operates according to the plurality of pre-determined loop parameters, wherein the interactive computing equipment regulates at least one of the loop parameters automatically in real time according to an online loop value when the voltage regulator is operating online, and the interactive computing equipment keeps regulating the loop parameters until the online value of the voltage regulator matches with a target value.
    Type: Application
    Filed: October 29, 2018
    Publication date: May 2, 2019
    Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang
  • Publication number: 20190068049
    Abstract: An over current protecting circuit, used with a switching converter having a switch, having: a current limiting circuit, configured to receive a limit indicating signal and to provide an on time signal to control an on time period of the switch based on the limit indicating signal, wherein if the limit indicating signal indicates a current flowing through the switch of the switching converter is larger than a limiting threshold, the on time period of a next switching cycle of the switch is subtracted with a first period, otherwise, the on time period of the switch of the next switching cycle is added with a second period; wherein a maximum on time period of the switch is fixed to be an on time reference.
    Type: Application
    Filed: August 14, 2018
    Publication date: February 28, 2019
    Inventors: Xiaokang Wu, Qian Ouyang, Yu Zhang, Xiaogang Wei
  • Publication number: 20180173286
    Abstract: An autonomous power system has a voltage regulator which converts an input voltage to an output voltage according to a reference voltage. A control method for the power system: receiving a voltage identification code sent by a processor; providing an autonomous voltage identification code when the voltage identification sent by the processor keeps constant during a first preset duration, wherein the autonomous voltage identification code can be updated self-adaptively; providing a reference voltage according to a sum of the voltage identification code and the autonomous identification code; and adjusting the output voltage according to the reference voltage.
    Type: Application
    Filed: December 14, 2017
    Publication date: June 21, 2018
    Inventors: Reagan Luo, Qian Ouyang, Lijie Jiang, Marvin Ma, Xiaokang Wu
  • Publication number: 20170288539
    Abstract: A DC-DC converter with transient control. The DC-DC converter includes a power switching circuit, a current to voltage converter, a PI circuit 403, a voltage to current converter 404 and a logic and control circuit 405. The DC-DC converter obtains the transient information of a current flowing through the power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.
    Type: Application
    Filed: June 14, 2017
    Publication date: October 5, 2017
    Inventors: Chao Liu, Lijie Jiang, Qian Ouyang, Xiaokang Wu
  • Patent number: 9660534
    Abstract: A multiphase switching converter having a plurality of switching circuits and a control circuit, the plurality of switching circuits provide an output voltage, the control circuit provides a plurality of switching control signals to turn ON the plurality of switching circuits successively based on the output voltage and a reference signal, when the output voltage is detected overshooting, the control circuit turns OFF a current switching circuit, and when the output voltage is detected recovering from overshooting, the control circuit turns ON the current switching circuit again for a first time period until a sum of the first time period and a second time period achieves a predetermined value, wherein the second time period is a time period the current switching circuit maintains ON uninterruptedly before the output voltage is detected overshooting.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: May 23, 2017
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang, Jinghai Zhou
  • Publication number: 20170141680
    Abstract: The present invention discloses a DC-DC converter with constant on time control. The DC-DC converter includes a transient unit to obtain the transient information of a current flowing through a power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.
    Type: Application
    Filed: November 4, 2016
    Publication date: May 18, 2017
    Inventors: Qian Ouyang, Xiaokang Wu, Lijie Jiang
  • Patent number: 9479043
    Abstract: A control circuit for a switching converter having a comparison circuit, a synchronization unit, an ON-time control circuit and a logic unit, the comparison circuit provides a comparison signal based on a reference signal and an output signal of the switching converter, the synchronization unit provides a first synchronization signal and a second synchronization signal based on a first clock signal, a second clock signal and the comparison signal, the first synchronizing signal is generated by synchronizing the comparison signal with the first clock signal, the second synchronizing signal is generated by synchronizing the comparison signal with the second clock signal, the ON-time control circuit provides an ON-time control signal, the logic unit provides a switching control signal to control the switching converter based on the first synchronization signal, the second synchronization signal and the ON-time control signal.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: October 25, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang
  • Patent number: 9356510
    Abstract: A switching converter providing an output voltage has at least one switch and a control circuit. The control circuit has a slope compensation module, an output correction module and a control module, wherein the slope compensation module provides a slope compensation signal, the output correction module provides a voltage trim signal based on the slope compensation signal, and the control module provides a control signal to control the at least one switch based on the slope compensation signal, the voltage trim signal, a reference signal, the output voltage and an error compensation signal provided based on a difference between the output voltage and a set target of the output voltage.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: May 31, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lijie Jiang, Xiaokang Wu, Qian Ouyang